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CTR-80 - GE Measurement & Control

1. eee 25 Chapter 6 Parts and Controls 6 1 Control Panel sl ec Eee a EIAS debe 27 6 2 Bath Tank and Eid scere E TIA CAU ENS 28 6 3 Back Panel sete tL eet ie c pte e s 30 Chapter 7 General Operation FA Bath Ehud uuo ee SA ee A GR Ge eh MENU eR ed 31 TT T Temperature Range eC eMe Vi p RR RUE Rae 31 7 1 2 Wiscosity oL ARTS ES LR ES EE be Pewee eel 31 TI Spector A ARA 32 7 1 4 Thermal Conductivity nussen naa ccc 32 7 1 5 Thermal Expansion 0 0 0 0 cece cece cece teen eee en ene eres 32 7 16 Electrical Resistivity i2 Andee cb pL s Wwe d WS Ye e br pi al dux de 32 TT Fluid Lifetime sn earo rauei YS rH EeuUE PIRE CR ER DIRE EN RA ER AR 32 iv CTR 80 User s Manual 7 2 7 3 7 4 7 5 7 6 Contents T lsgasafety o ELS S bus RIS NL ER Deck Seok ete eel a 33 PIRS 1GOSt s cup Salers el re vie pe E CPUDPERR OBS octesikrse terat seres 33 7 1 9 Commonly Used Fl ids sonan RR RARI Re RE ERE Ee 34 T 1 9aWater Distilled sc er a CERE quce eC quieto ds 34 7 T9bEthanol TRES ee teet e e ees 34 7 1 9cMineral Ol eR ERR REPRE CREE ERE XS 34 7 1 9dSilicone Oil Dow Corning 200 05 200 10 200 20 35 7 1 10 Fluid Characteristics 2016 e 35 7 1 11 Limitations and 12106 eee 37 SUMMING s mt 37 POW 5 26 Lohse AE ue EACH ebd eS
2. 38 Heater eeen tb AS e OHNE e e bs ue ee es 38 Reirigeration UR et A eels Sanh E 39 TS Operation sose sorer Meee AREE MR RR ERAPEAIR EU OE E EER S CNET seed 39 7 5 2 Important Refrigerant Information 00 0 0 0 cece cette ees 39 Temperature Controller 40 CTR 80 User s Manual V Contents Chapter 8 Controller Operation 8 1 Introductionis zur e verb estes ber ER UE REVERDL ER DLM NU OS ERN 41 8 2 Bath Temperature eet etd Mage e de c TAG e ede Ot eee 41 8 3 Temperature Setpoint 00 e s 43 8 3 1 Programmable Set points tenet e 43 8 3 2 Set point Val e s seess sadia roana RR CHEER eR TUE IURE ER ERU 44 8 3 3 Temperature Scale Units ci ech tees ete Bales Verte 45 8 4 SCIAS as elo Medea ota et des teu Seded seti he eite tds 45 8 amp 4 1 Scan Control i d DRE HR RR Sew ede IEEE 45 SAD San Rate he nies Fe PMPRDLE ERU SSVDRGR IRE bo dU DES aS Me a PET HS 46 8 5 Secondary Menu os UMP EMI VEN MERO VO URN eR n 46 8 6 Heater POWER AN 47 8 7 Proportional Band iii RIEN Eee XN A AN SEU ei ENS 48 8 5 Cutouts 22 eed it EU uv e ERE 50 8 9 Controller Configuration 00 ete 51 8 10 Operating Parameters e rh 52 8 10 1 High Limit cnn REUNIR UP DRE ERR ER ees 52 8 102 How Limit m
3. 4 4 Power With the bath power switch off plug the bath into an AC mains outlet of the appropriate voltage frequency and current capacity See Chapter 2 Specifications and Environmental Conditions for power details Refer to and read the CAUTION at the front of this manual concerning brownout and over voltage protection 22 CTR 80 User s Manual Chapter 5 Bath Use Chapter 5 Bath Use 5 1 Introduction CAUTION A THIS SECTION BEFORE PLACING THE BATH IN SERVICE The information in this section is for general information only It is not designed to be the basis for calibration laboratory procedures Each laboratory will need to write its own specific procedures 5 2 General Information Be sure to select the correct fluid for the temperature range of the calibration Bath fluids should be selected to operate safely with adequate thermal properties to meet the application requirements Also be aware that some fluids expand and could overflow the bath if not watched Refer to Chapter 7 General Operation for information specific to fluid selection and to the MSDS sheet specific to the fluid selected The temperature range of any single fluid is likely less than that of the bath itself This means that the type of bath fluid may have to change to cover the full range of the bath see page 31 Baths are most often set up to operate with a single fluid only over the useful range of that fluid Other baths can be set up with other
4. 59 to make the bath temperature as measured with the standard thermometer match the set point The approximate ratio between a change in DELTA and a change in temperature at 50 C is about 4 0 to 1 For example if the bath temperature is high by 0 1 C at 50 C then decrease DELTA by 0 4 Set the set point to 70 C and allow adequate time for the bath to reach this temperature and stabilize Adjust the BETA calibration parameter see page 59 to make the bath temperature as measured with the standard thermometer match the set point The approximate ratio between a change in BETA and a change in temperature at 70 C is about 1 0 to 1 For example if the bath temperature is high by 0 1 C at 70 C then increase BETA by 0 1 CTR 80 User s Manual Chapter 11 Maintenance Chapter 11 Maintenance 11 1Bath Maintenance e The calibration instrument has been designed with the utmost care Ease of operation and simplicity of maintenance have been a central theme in the product development Therefore with proper care the instrument should require very little maintenance Avoid operating the instrument in dirty or dusty environments e Ifthe outside of the bath becomes soiled it may be wiped clean with a damp cloth and mild detergent Do not use harsh chemicals on the surface which may damage the paint Periodically check the fluid level in the bath to ensure that the level has not dropped A drop in the fluid level affects th
5. SET DOWN UP and EXIT are used to set the bath temperature set point access and set other operating parameters and access and set bath calibration parameters A brief description of the functions of the buttons follows SET Used to display the next parameter in a menu and to set parameters to the displayed value DOWN Used to decrement the displayed value of parameters UP Used to increment the displayed value EXIT Used to exit from a menu When EXIT is pressed any changes made to the displayed value will be ignored 3 The on off switch controls power to the entire bath including the stirring motor CTR 80 User s Manual 27 Chapter 6 Parts and Controls 6 1 Control Panel cont Figure 1 CTR 80 Control Panel 4 The heater mode is a red light emitting diode LED This indicator lets the user visually see the ratio of heating to cooling When the indicator is lit the heater 15 on and when it is off the heater 1s off and the bath is cooling 5 The cooling switch turns on the refrigeration for control below 50 C and rapid cool down 6 2 Bath Tank and Lid The bath tank and lid assembly includes the tank the control probe the stirring motor the access hole and the access hole cover e The bath tank is constructed of stainless steel It is very resistant to oxidation in the presence of most chemicals and over a wide range of temperatures 28 CTR 80 User s Manual Chapter 6 Parts and Co
6. changed the bath heats or cools at a specified rate degrees per minute until it reaches the new set point With the scan disabled the bath heats or cools at the maximum possible rate 8 4 1 Scan Control The scan is controlled with the scan on off function that appears in the main menu after the set point function Se On Scan Function On Press SET to accept the present setting and continue Accept Scan Setting CTR 80 User s Manual 45 Chapter 8 Controller Operation 8 4 2 Scan Rate The next function in the main menu is the scan rate The scan rate can be set from 0 1 to 99 9 C min The maximum scan rate however is actually limited by the natural heating or cooling rate of the instrument This will be less than 10 C min The scan rate function appears in the main menu after the scan control function The scan rate units are in degrees per minute degrees C or F depending on the selected units Sr 2 0 New Scan Rate Press SET to accept the new scan rate and continue SET Accept Scan Rate 8 5 Secondary Menu Functions which are used less often are accessed within the secondary menu The secondary menu is accessed by pressing SET and EXIT simultaneously and then releasing The first function in the secondary menu is the heater power display See Figure 3 on page 42 46 CTR 80 User s Manual Chapter 8 Controller Operation 8 6 Heater Power The temperature controller controls the temperature of the bat
7. energized for more than 10 days the bath will need to be energized for a dry out period of 1 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 CTR 80 User s Manual 21 Chapter 4 Installation 4 3 Bath Preparation and Filling CAUTION A The drain valve comes installed with the bath Ensure that the drain valve is closed prior to filling the bath with fluid 4 5 1 Filling with Fluid The CTR 80 Bath is not provided with a fluid Depending on the desired temperature range any of the following fluids as well as others may be used in the bath e Water Ethanol Ethyl Alcohol e Ethylene glycol water Mineral oil e Silicone oil e Halocarbon 0 8 Fluids are discussed in detail in Chapter 7 Remove any access hole cover from the bath and check the tank for foreign matter dirt remnant packing material etc Ensure the valve handle is in the closed position before attempting to add fluid to the tank Fill the bath with clean unpolluted fluid Fill the bath carefully through the large square access hole to a level that will allow for stirring and thermal expansion DO NOT turn on the bath without fluid in the tank The fluid should never exceed a height of 1 2 below the top of the tank or be less than 2 inches below the top Carefully monitor the bath fluid level as the bath temperature rises to prevent overflow or splashing Cautiously remove excess hot fluid if necessary
8. oxygen present and a ignition source is applied the vapor will ignite This does not necessarily mean that fire will be sustained at the flash point The flash point may be either of the open cup or closed cup type Either condition may occur in a bath situation The closed cup temperature is always the lower of the two The closed cup represents the contained vapors inside the tank and the open cup represents the vapors escaping the tank Oxygen and an ignition source will be less available inside the tank The cutout should be set to meet the temperature limits of the selected fluid Environmentally hazardous fluids require special disposal according to applicable federal or local laws after use 7 1 8 Cost Cost of bath fluids may vary greatly from cents per gallon for water to hundreds of dollars per gallon for synthetic oils Cost may be an important consideration when choosing a fluid CTR 80 User s Manual 33 Chapter 7 General Operation 7 1 9 Commonly Used Fluids Below is a description of some of the more commonly used fluids and their characteristics 7 1 9a Water Distilled Water is often used because of its very low cost availability and excellent temperature control characteristics Water has very low viscosity and good thermal conductivity and heat capacity which makes it among the best fluids for control stability at low temperatures Temperature stability is much poorer at higher temperatures because water con
9. t LAE recie s qoe 12 22 9 Immersion Dept A ER ee SENS 12 2 2 10 Tank Capacity ers ied pe SI e ee IRA GER NERVES 13 2 2 1 Cooling Time OOOO REO ERR OL Sh REV 13 2 2 Heater ROW er sevice sens CENA LE RC ea oN C DW d CR 13 2 2 2 Automation Package RE a a 13 2 2 3 13 DD ESTA RE 13 2 2 5 Weight ovS PG ae ee a ee a oa EP REP 13 2 3 Environmental Conditions 00 cece ec ccc een ene eee IAE p ENa 14 2 4 Customer Site Assistance ills LR Ea REI ARE Oe Re ee dw oa 14 CTR 80 User s Manual iii Contents Chapter 3 Quick Start 3 1 Introduction x ores riesen WERE PIRE LEGERE ERN 15 3 2 Unpackmg Jl iau et CE A t te ud te a les 15 373 DEP Em 16 IA POWE li IAS el rg 17 3 5 Setting the Temperature RR RD Sen Oa eR Ce dee cia 18 Chapter 4 Installation 4 1 Bath Enymr nment a A OR eo a EN 21 42 Dry out Period et e te a cds 21 4 3 Bath Preparation and 1111085 22 4 31 Filling With Fluid estos obest er a xi ag 22 AA PoWer zi scr ostio pe ey Sos Lc MI Vm teer cuti ch SONO Ree 22 Chapter 5 Bath Use IL Introductions vies vee Moe us ek e RCRUM ee USUS CEN NUS 23 5 2 General Information etae e cde tee d e p lieta 23 5 3 Comparison Calibrati0M ooooooooorrrrr ehe 24 5 3 1 Calibration of Multiple 10065
10. 0 Paulo SP 05804 900 Brasil T455 11 3614 1876 F 455 11 3614 1799 E sensing brasil ge com S www ge mcs com pt U S A For Technical Support The Boston Center 1100 Technology Park Orive Billerica MA 01821 U S A T 800 833 9438 toll free T 978 437 1242 E mail validation support ge com China GE Sensing amp Inspection Technologies Building 10 Jintong International Industrial Park No 8 Xihu Road Wujin High Tech Industrial Zone Changzhou China 213164 T 86 519 8831 8080 ext 50087 F 86 519 8831 2601 www ge mcs com en about us quality html www ge mcs com 2013 General Electric Company All rights reserved Technical content subject to change without notice M4336 Rev D
11. 1 7 Q em3 Limiting Factors b boiling point e high evaporation fl flash point fr freeze point v viscosity Flash point test oc open cup cc closed cup Very low water solubility ice will form as a slush from condensation below freezing 36 CTR 80 User s Manual Chapter 7 General Operation 7 1 11 Limitations and Disclaimer The information given in this manual regarding fluids is intended only to be used as a general guide in choosing a fluid Though every effort has been made to provide correct information we cannot guarantee accuracy of data or assure suitability of a fluid for a particular application Specifications may change and sources sometimes offer differing information GE cannot be liable for any personal injury or damage to equipment product or facilities resulting from the use of these fluids The user of the bath is responsible for collecting correct information exercising proper judgment and insuring safe operation Operating near the limits of certain properties such as the flash point or viscosity can compromise safety or performance Your company s safety policies regarding flash points toxicity and such issues must be considered You are responsible for reading the material safety data sheets and acting accordingly 7 2 Stirring Stirring of the bath fluid is very important for stable temperature control The fluid must be mixed well for good temperature uniformity and fast controlle
12. C 0 48 25 C 0 53 75 C 0 57 125 C 0 00025 25 C 0 0007 50 C 5 25 C Silicone Oil Type 200 05 5010 130 C fl cc 5 25 C 0 92 25 C 0 4 0 00028 25 C 0 00105 1000 25 C 10 150 C Silicone Oil Type 200 10 5012 209 C fl 10 25 C 3 135 C 0 934 25 C 0 43 40 C 0 45 100 C 0 482 200 C 0 00032 25 C 0 00108 1000 25 C 50 150 C Silicone Oi Type 200 20 5013 10 C v 230 C fl cc 20 25 C 0 949 25 C 0 370 40 C 0 393 100 C 0 420 200 C 0 00034 25 C 0 00107 1000 25 C 50 150 C Si Type 200 50 5014 30 C v 278 C fl cc 50 25 C 0 96 25 C 0 4 0 00037 25 C 0 00104 1000 25 C 50 150 C Silicone Oi Type 550 5016 70 C v 230 C fl cc 300 C fl oc 50 70 C 10 104 C 1 07 25 C 0 358 40 C 0 386 100 C 0 433 200 C 0 00035 25 C 0 00075 100 25 C 1 150 C Silicone Oi Type 710 5017 80 C v 300 C fl oc 50 80 C 7 204 C 1 11 25 C 0 363 40 C 0 454 100 C 0 505 200 C 0 00035 25 C 0 00077 100 25 C 1 150 C Silicone Oi Type 210 H 66 C v 313 C fl 315 C oc 50 66 C 14 204 C 0 96 25 C 0 34 100 C 0 00095 100 25 C 1 150 C Heat Transfer Salt 5001 34 150 C 6 5 300 C 2 4 S00 C 2 0 150 C 1 9 300 C 1 7 500 C 0 00041
13. DUPLEX is set to FULL and a command is sent to READ the command is returned followed by a carriage return and linefeed Then the value is returned as indicated in the RETURNED column 68 CTR 80 User s Manual Chapter 10 Calibration Procedure Chapter 10 Calibration Procedure 10 1Introduction Calibration of this instrument should be performed at regularly scheduled intervals by qualified authorized personnel in accordance with your company s policy Following is the recommended procedure for calibrating this instrument 10 2Calibration Equipment Calibration requires a standard thermometer that is adequately accurate and fits properly into one of the reference holes in the block Recommended equipment includes a laboratory grade PRT with a length of 30 to 300 mm 9 to 12 inches and a diameter of 4 76 or 6 35 mm 3 16 or 1 4 inches The combined accuracy of the PRT and the readout which used to display the temperature should be 0 025 C or better 10 3Calibration The accuracy of the instrument over the full range is determined by the values of the calibration parameters RO ALPHA DELTA and BETA The calibration procedure involves measuring the error between the instrument and the reference thermometer at several temperature throughout the range and adjusting the calibration parameters as necessary to reduce the errors to within acceptable limits The stated accuracy of the instrument can be found in the specification table in Chap
14. GE Measurement amp Control Validation CTR 80 User s Manual M4336 Rev D imagination at work April 2013 GE Measurement amp Control CTR 80 Kaye Cold Temperature Reference User s Manual M4336 Rev D April 2013 http www ge mcs com en validation and environmental monitoring html ES 2013 General Electric Company All rights reserved Technical content subject to change without notice Contents Chapter 1 Before You Start Tal Symbols Used red pES e nS eM Ree t EINE E SDN EINE 1 1 1 1 Safety formato seu ga dee t bet Ab de t weiss 2 I 1 2 Warnmngs 25 E Re eee ess 3 14 3 Cautions Lu Spe neue edie Sauer ele Se Sa Ve a POP PEU EOS 6 1 1 4 Cautions Cold Baths en 9 1 1 5 Customer Service 1000002608 10 Chapter 2 Specifications and Environmental Conditions 2 1 Intro dt ete tt i ip dee Ahead laid dee en 11 2 2 SPecCliCatlOns s c t Le Se a e 12 2 2 T SRangessnssclcs9uy e ew a eee a PR 12 2 2 2 Ambient Operating Range 12 2 2 3 Stability i ov at eec esa Bae Jed pua ees 12 2 2 UntfOrtiity se cms te e e d e tu ee t At E 12 2 2 5 Set Point Accuracy 2 44 428s ahs ch ta eb ieee bed eds RV RE E 12 2 2 6 Set Point Repeatability 2 lesse 12 2 25 X Resolutiom d ecce mus E e a Me RS DAL 12 2 2 8 Access Opening erann re VR eR pe CORR
15. ally on Ensure that the refrigeration is off when the unit is used above 60 C The Factory Reset Sequence should be performed only by authorized personnel if no other action is successful in correcting a malfunction You must have a copy of the most recent Report of Test to restore the test parameters DO NOT operate this instrument in an excessively wet oily dusty or dirty environment Chapter 1 Before You Start Cautions cont CAUTION The unit is a precision instrument Although it has been designed for optimum durability and trouble free operation it must be handled with care Position the unit before the tank is filled with fluid Use the handles provided to move the unit Due to the weight of the compressor it may require two people to safely move the bath If two people are used place one person in the front and one person in the back of the unit carefully slide hands under the unit and lift in unison The area containing the compressor will be heavier than the rest of the unit Do not move a unit filled with fluid Most probes have handle temperature limits Be sure that the probe handle temperature limit is not exceeded in the air above the instrument The instrument and any thermometer probes used with it are sensitive instruments that can be easily damaged Always handle these devices with care Do not allow them to be dropped struck stressed or overheated CTR 80 User s Manual Chapter 1 Before Y
16. applicable to all fluids used in the baths should be kept in close proximity to the instrument CTR 80 User s Manual 71 Chapter 11 Maintenance 11 1 Bath Maintenance cont 72 If the mains supply cord becomes damaged replace it with a cord with the appropriate gauge wire for the current of the bath If there are any questions call GE Customer Service for more information Before using any cleaning or decontamination method except those recommended by GE users should check with GE Customer Service to be sure that the proposed method will not damage the equipment The condensing coil should be cleaned regularly Inspect the coil through the vented rear panel If any dust or dirt accumulation is visible remove the rear panel to clean out the dust or dirt Use a vacuum with a brush to remove the dirt Do not use compressed air as it might drive the dirt between the fins where it may become lodged preventing airflow If the instrument is used in a manner not in accordance with the equipment design the operation of the bath may be impaired or safety hazards may arise CTR 80 User s Manual Chapter 12 Troubleshooting Chapter 12 Troubleshooting 12 1Introduction If problems arise while operating the CTR 80 this section provides some suggestions that may help you solve the problem A wiring diagram is also included 12 2Troubleshooting Below are several situations that may arise followed by suggested actions to ta
17. ash point boiling point or other fluid characteristic applicable to the circumstances of the unit operation Ensure that the soft cutout is adjusted to the fluid characteristics of the application As a guideline the soft cutout should be set 10 C to 15 C below the flash point of the bath fluid See Table 2 on page 36 for specific information on bath fluids and the section Cutout page 8 10 1 1 3 Cautions CAUTION The drain valve comes installed with the bath Ensure that the drain valve is closed prior to filling the bath with fluid Always operate this instrument at room temperature between 41 F and 122 F 5 C to 50 C Allow sufficient air circulation by leaving at least 6 inches 15 cm of clearance around the instrument CTR 80 User s Manual Chapter 1 Before You Start Cautions cont CAUTION CTR 80 User s Manual DO NOT overfill the bath Overflowing liquid may damage the electrical system Be sure to allow for thermal expansion of the fluid as the bath temperature increases See the section Bath Preparation and Filling page 22 for specific instructions DO NOT change the values of the bath calibration constants from the factory set values The correct setting of these parameters is important to the safety and proper operation of the unit The refrigeration may be damaged or the lifetime shortened if the set point temperature is set above 60 C for more than one hour with the refrigeration manu
18. bration A ee i ee a AES 69 Chapter 11 Maintenance Id I Bath Maintenance i esse perl athe dso ie ated so ensis ey aos Yas 71 Chapter 12 Troubleshooting 12 Introductions oie A oP oa a Coa eae Sw eda Fete 73 12 2 Troubleshooting Lu estan aa r a a as Se 73 12 3CE Comments te ute Aleka A lente Atha MA et det aep a Res 75 12 3 EME Directive seo Be uS peu Cu Om S S eM 75 12 3 2 Low Voltage Directive eect eee 75 CTR 80 User s Manual vii Contents viii CTR 80 User s Manual Chapter 1 Before You Start Chapter 1 Before You Start 1 1 Symbols Used Table 1 below lists the International Electrical Symbols Some or all of these symbols may be used on the CTR 80 or in this manual Table 1 International Electrical Symbols Symbol Description U AC Alternating Current AC DC Battery Complies with European Union directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard CTR 80 User s Manual dl Chapter 1 Before You Start Table 1 International Electrical Symbols Continued Description Read the User s Manual Important Information Off On Canadian Standards Association OVERVOLTAGE Installation CATEGORY II Pollution Degree 2 per IEC1010 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY II is energy consuming equipment to be supplied from the fixed
19. cteristics Table Table 7 1 on the next page provides help in selecting a heat exchange fluid media for your constant temperature bath This table provides a numerical representation of most of the physical qualities important in making a selection The list is not all inclusive There may be other useful fluids not shown in this listing The table includes information on a variety of fluids which are often used as heat transfer fluid in baths Because of the temperature range some fluids may not be useful with your bath CTR 80 User s Manual 35 Chapter 7 General Operation Fluid Hart Part No Halocarbon 0 8 5019 Lower Temper ature Limit 100 C v Upper Temperature Limit 70 C e Table 2 Various Bath Fluids Viscosity centi stokes 5 7 50 C 0 8 40 C 0 5 70 C Specific Gravity 1 71 40 C Specific Heat cal g C Thermal Conductivity cal s cm C Thermal Expansion cm cm C Resistivity 1012 O cm Methanol 96 C fr 10 C fl cc 1 3 35 C 0 66 0 C 0 45 20 C 0 810 0 C 0 792 20 C 0 0005 20 C 0 0014 25 C Water 0 C fr 95 C b 1 25 C 0 4 75 C 1 00 1 00 0 0002 25 C Ethylene Glycol 50 5020 30 C fr 90 C b 7 0 C 2 50 C 0 7 100 C 0 8 0 C Mineral Oil No 7 5011 10 C v 166 C fl 168 C 15 75 C 5 125 C 0 87 25 C 0 84 75 C 0 81 125
20. d by the equipment may be impaired Before initial use or after transport or after storage in humid or semi humid environments or anytime the instrument has not been energized for more than 10 days the instrument needs to be energized for a dry out period of 2 hours before it can be assumed to meet all of the safety requirements of the IEC 1010 1 If the product is wet or has been in a wet environment take necessary measures to remove moisture prior to applying power such as storage in a low humidity temperature chamber operating at 50 C for 4 hours or more DO NOT operate high temperature baths 500 C near flammable materials Extreme temperatures could ignite the flammable material Overhead clearance is required Do not place the instrument under a cabinet or other structure Always leave enough clearance to allow for safe and easy insertion and removal of probes The instrument is intended for indoor use only IBURN HAZARD Extremely cold temperatures may be present in this equipment Freezer burns and frostbite may result if personnel fail to observe safety precautions High temperatures may be present in this equipment Fires and severe burns may result if personnel fail to observe safety precautions CTR 80 User s Manual Chapter 1 Before You Start Warnings cont IELECTRICAL HAZARD These guidelines must be followed to ensure that the safety mechanisms in this instrument will operate properly This instr
21. denses on the lid cools and drips into the bath Water is safe and relatively inert The electrical conductivity of water may prevent its use in some applications Water has a limited temperature range from a few degrees above 0 C to a few degrees below 100 C At higher temperatures evaporation becomes significant Water used in the bath should be distilled or softened to prevent mineral deposits Consider using an algaecide chemical in the water to prevent contamination 7 1 96 Ethanol Denatured ethanol ethyl alcohol is often used at lower temperatures between 80 C and 10 C It has good viscosity over its range and is inexpensive Toxicity vapors and flammability at temperatures higher than 10 C are significant issues that must be considered 7 1 9c Mineral Oil Mineral oil or paraffin oil is often used at moderate temperatures above the range of water Mineral oil is relatively inexpensive At lower temperatures mineral oil is quite viscous and control may be poor At higher temperatures vapor emission becomes significant The vapors may be dangerous and use of a fume hood is highly recommended As with most oils mineral oil will expand as temperature increases so be careful not to fill the bath too full so that it overflows when heated The viscosity and thermal characteristics of mineral oll is poorer than water so temperature stability will not be as good Mineral oil has very low electrical conductivity Use caution with mineral
22. dth of the proportional band If the band is too wide the temperature will deviate excessively from the set point due to varying external conditions This is because the power output changes very little with temperature and the controller cannot respond very well to changing conditions or noise in the system If the proportional band is too narrow the temperature may swing back and forth because the controller overreacts to temperature variations For best control stability the proportional band must be set for the optimum width This value is usually two to three times the largest value at which the bath temperature oscillates The proportional band width 15 set at the factory to a value between 0 5 and 1 0 C The proportional band width may be altered by users who desire to optimize the control characteristics for a particular application The proportional band width is easily adjusted from the front panel The width may be set to discrete values in degrees C or F depending on the selected units The proportional band adjustment is be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET to access the proportional band 48 CTR 80 User s Manual Chapter 8 Controller Operation 8 7 Proportional Band cont ser f Access Heater Power in Secondary a Menu 12 0 P Heater Power in Percent Access Proportional Band ProP Flashes ProP and the Settin
23. e probes is that the probes do not need to be identical in construction The fluid in the bath allows different types of probes to be calibrated at the same time However stem effect from different types of probes is not totally eliminated Even though all baths have horizontal and vertical gradients these gradients are minimized inside the bath work area Nevertheless probes should be inserted to the same depth in the bath liquid Be sure that all probes are inserted deep enough to prevent stem effect We suggest a general rule of thumb for immersion depth to reduce the stem effect to a minimum 20x the diameter of the UUT the sensor length Do not submerge the probe handles If the probe handles get too warm during calibration at high temperatures a heat shield could be used just below the probe handle This heat shield could be as simple as aluminum foil slid over the probe before inserting it in the bath or as complicated as a specially designed reflective metal apparatus When calibrating over a wide temperature range better results can generally be achieved by starting at the highest temperature and progressing down to the lowest temperature 24 CTR 80 User s Manual Chapter 5 Bath Use 5 3 Comparison Calibration cont Probes can be held in place in the bath by using probe clamps or drilling holes in the access cover Other fixtures to hold the probes can be designed The object is to keep the reference probe and the probe s
24. e indicator will pulse constantly when the bath is maintaining a stable temperature 38 CTR 80 User s Manual Chapter 7 General Operation 7 5 Refrigeration This bath uses a two stage refrigeration system which requires special refrigerants to enable it to reach low temperatures This section describes some aspects of the cooling system and provides important information regarding refrigerants 7 5 1 Operation The bath controller automatically switches off cooling when the bath is operated above 50 C to protect the system from extreme pressures The refrigeration system is also protected by a brownout and over voltage protection device that switches off power to the system when the line voltage is outside the safe operating range The display indicates LoLinE when this condition exists A time delay prevents the refrigeration from restarting for a short time after adequate line voltage has been restored 7 5 2 Important Refrigerant Information The refrigeration system in this bath has been designed to perform at ultra low temperatures As a result aspects of the design are uncommon and the refrigerants are non standard The system is cascaded meaning there are two separate systems with the first one chilling the second This is required to reach temperatures below 40 C Normal refrigeration does not use a cascading technique and many refrigeration technicians are not familiar with such systems The first stage refrigera
25. e of this parameter is set at the factory for best instrument accuracy CTR 80 User s Manual 59 Chapter 8 Controller Operation no content intended for this page proceed to next page 60 CTR 80 User s Manual Chapter 9 Digital Communications Interface Chapter 9 Digital Communications Interface 9 1 Introduction The CTR 80 Bath calibrator is capable of communicating with and being controlled by other equipment through the digital serial interface With a digital interface the instrument may be connected to a computer or other equipment This allows the user to set the set point temperature monitor the temperature and access any of the other controller functions all using remote communications equipment Communications commands are summarized in Table 3 on page 65 9 2 Serial Communications The bath is installed with an RS 232 serial interface that allows serial digital communications over fairly long distances With the serial interface the user may access any of the functions parameters and settings discussed in Chapter 8 with the exception of the baud rate setting CTR 80 User s Manual 61 Chapter 9 Digital Communications Interface 9 3 Wiring The serial communications cable attaches to the calibrator through the DB 9 connector at the back of the instrument Figure 4 below shows the pin out of this connector and suggested cable wiring To eliminate noise the serial cable should be shielded with low resista
26. e stability of the bath Changes in fluid level are dependent upon several factors specific to the environment in which the equipment is used A schedule cannot be outlined to meet each environmental setting Therefore the first year the bath should be checked weekly with notes kept as to changes in bath fluid After the first year the user can set up a maintenance schedule based on the data specific to the application e Heat transfer medium lifetime is dependent upon the type of medium and the environment The fluid should be checked at least every month for the first year and regularly thereafter This fluid check provides a baseline for knowledge of bath operation with clean usable fluid Once some fluids have become compromised the breakdown can occur rapidly Particular attention should be paid to the viscosity of the fluid A significant change in the viscosity can indicate that the fluid is contaminated being used outside of its temperature limits contains 106 particles or is close to a chemical break down Once data has been gathered a specific maintenance schedule can be outline for the instrument Refer to Chapter 7 General Operation for more information about the different types of fluids used in calibration baths e Ifa hazardous material is spilt on or inside the equipment the user is responsible for taking the appropriate decontamination steps as outlined by the national safety council with respect to the material MSDS sheets
27. ectrical resistivity describes how well the fluid insulates against the flow of electric current In some applications such as measuring the resistance of bare temperature sensors it may be important that little or no electrical leakage occur through the fluid In such conditions choose a fluid with very high resistivity 7 1 7 Fluid Lifetime Many fluids degrade over time because of evaporation water absorption gelling or chemical breakdown Often the degradation becomes significant near the upper temperature limit of the fluid substantially reducing the fluid s lifetime 32 CTR 80 User s Manual Chapter 7 General Operation 7 1 7a Safety When choosing a fluid always consider the safety issues associated Obviously where there are conditions of extreme hot or cold there can be danger to people and equipment Fluids may also be hazardous for other reasons Some fluids may be considered toxic Contact with eyes skin or inhalation of vapors may cause injury A proper fume hood must be used if hazardous or bothersome vapors are produced WARNING Fluids at high temperatures may pose danger from BURNS FIRE and TOXIC FUMES Use appropriate caution and safety equipment Fluids may be flammable and require special fire safety equipment and procedures An important characteristic of the fluid to consider is the flash point The flash point is the temperature at which there is sufficient vapor given off so that when there is sufficient
28. er in the menu The display prompts with the baud rate parameter by showing bAUd Press SET to choose to set the baud rate The current baud rate value is displayed The baud rate of the instrument serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud The baud rate is pre programmed to 2400 baud Use UP or DOWN to change the baud rate value Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu 9 3 16 Sample Period The sample period is the next parameter in the menu and prompted with SPEr The sample period is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 the instrument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 Press SET to choose to set the sample period Adjust the period with UP or DOWN and then use SET to set the sample rate to the displayed value 9 3 1c Duplex Mode The next parameter is the duplex mode indicated with dUPL The duplex mode may be set to half duplex HALF or full duplex FULL With full duplex any commands received by the thermometer via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The default setting is half duplex The mode ma
29. esolution 0 01 2 2 8 Access Opening 3 25 x 4 5 86 x 114 mm 2 2 9 Immersion Depth 7 180 mm max 12 CTR 80 User s Manual Chapter 2 Specifications and Environmental Conditions 2 2 10 Tank Capacity 1 gallon 4 liters 2 2 11 Cooling Time From 25 C to 80 C 130 minutes 2 2 Refrigeration Cascade Two 4 HP compressors 2 2 1 Heater Power 500W 2 2 2 Automation Package Interface it software and RS 232 included 2 2 5 Power 115 VAC 10 60 Hz 15 A or 230 VAC 10 50 Hz 8 A 1700 VA 2 2 4 Size 12 W x 30 H x 24 D 305 x 762 x 610 mm 2 2 5 Weight 115 Ib 52 kg CTR 80 User s Manual 13 Chapter 2 Specifications and Environmental Conditions 2 5 Environmental Conditions Although the instrument has been designed for optimum durability and trouble free operation it must be handled with care The instrument should not be operated in an excessively dusty or dirty environment Maintenance and cleaning recommendations can be found in Chapter 11 Maintenance The instrument operates safely under the following conditions temperature range 15 30 C 59 86 F ambient relative humidity 15 50 pressure 75 kPa 106 kPa mains voltage within 10 of nominal vibrations in the calibration environment should be minimized altitude less than 2 000 meters 2 4 Customer Site Assistance GE can provide optional onsite assistance with installation initial operation and
30. eum sente A ER RA A A EE 53 8 TI Cooling eo te as tt tete s etes tacto uot te ns 54 8 12Serial Interface Parameters 02 0 een tenet teen eens 55 8212 41 Baud Rate s usos ou PR PCT Sen ERR DURER IAN ETE ERR 55 8 12 2 Sample Periods e lp nes od RR AR EET ERES CEENS Pete 56 8 12 3 D plex Mode itean e chee A A porc Ses 57 8 12 3abmefe d A eaaet tete nc 57 8 13Calibration Parameters 1 0 eem s 58 8 13 Hard CotoUtilvc a ote Dev Oed ee oe eae a 59 8 13 20 R0 oan rcr t REEL ED DERE RR n EA E EIER E C ONCE 59 8 13 3 ALPHA 5 i ue eerte e eta Te rct 59 813 4 DELTA uz ente n Rhe pO AAN 59 SIS 59 vi CTR 80 User s Manual Contents Chapter 9 Digital Communications Interface OUT Introduction iuc eee E Ss de eee 61 9 2 Serial Communications ooo ooo 61 9 3 SWING EEEE e S S RERO s Wee GE a MIR 62 9 57 SUD A eb eX TOF BER as 63 9 3 laBatid Rate si sorer RR RR Fone 63 9 3 TbSamiple Periods o A RE HN Det et ens 63 9 3 TcDuplex Mode eruat e de edt e t a te tots 63 9 3IdLinefeed iii e ee Se Ee RE RE 64 93 2 Serial Operations x osse d DLP REALES ERECTA NR CE S OT CPI 64 9 4 64 Chapter 10 Calibration Procedure TO T IntrOdUctlon 2 33 oy cete t Dea c E e tO ERIS RN vere etras 69 10 2Calibration Equipment 20 n ne n e e I e 69 10 3 Cali
31. f duplex With full duplex any commands received by the calibrator via the serial interface are immediately echoed or transmitted back to the device of origin With half duplex the commands are executed but not echoed The duplex mode parameter is indicated by dUPL Flashes dUPL and then Displays the Setting 8 12 3a Linefeed The final parameter in the serial interface menu is the linefeed mode This parameter enables on or disables off transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The linefeed parameter is indicated by Flashes LF and then Displays LF the Setting LF On Current Linefeed Setting CTR 80 User s Manual 57 Chapter 8 Controller Operation 8 13Calibration Parameters The operator of the CTR 80 controller has access to the Hard Cutout and a number of the bath calibration constants namely RO ALPHA DELTA and BETA These values are set at the factory and should not be altered The correct values are important to the accuracy and proper and safe operation of the bath Access to these parameters is available to the user only so that in the event that the controller memory fails the user may restore these values to the factory settings The user should have a list of these constants and their settings with the manual CAUTION DO NOT change the values of the bath calibration constants from the factory set values The correct setting of
32. fluids to cover other temperature ranges required This is generally the most productive and efficient approach The bath generates extreme temperatures Precautions must be taken to prevent personal injury or damage to objects Probes may be extremely hot or cold when removed from the bath Cautiously handle probes to prevent personal injury CTR 80 User s Manual 23 Chapter 5 Bath Use 5 2 General Information cont Carefully place probes on a heat cold resistant surface or rack until they are at room temperature It is advisable to wipe the probe with a clean soft cloth or paper towel before inserting it into another bath This prevents the mixing of fluids from one bath to another Always be sure that the probe 1s completely dry before inserting it into a hot fluid Some of the high temperature fluids react violently to water or other liquid mediums Be aware that cleaning the probe can be dangerous if the probe has not cooled to room temperature For optimum accuracy and stability allow the bath adequate stabilization time after reaching the set point temperature 5 3 Comparison Calibration Comparison calibration involves testing a probe unit under test UUT against a reference probe After inserting the probes to be calibrated into the bath allow sufficient time for the probes to settle and the temperature of the bath to stabilize One of the significant dividends of using a bath rather than a dry well to calibrate multipl
33. g 15 0 Proportional Band Setting 1 5 New Proportional Band Setting To store the new setting press SET Press EXIT to continue without storing the new value Accept the New Proportional Band Setting CTR 80 User s Manual 49 Chapter 8 Controller Operation 8 8 Cutout As a protection against software or hardware fault or user error the bath is equipped with an adjustable cutout device that shuts off power to the heater if the temperature exceeds a set value This protects the instrument probes and fluid from excessive temperatures The cutout temperature is programmable by the operator from the front panel of the controller The cutout should be set to the temperature limits of the selected fluid If the cutout is activated because of excessive temperature power to the heater shuts off and the instrument cools The bath cools until it reaches a few degrees below the cutout set point temperature At this point the cutout resets and allows normal operation The cutout set point may be accessed within the secondary menu Press SET and EXIT to enter the secondary menu and show the heater power Then press SET twice to access the cutout set point ser Exr Access Heater Power in Secondary Menu 12 0 P Heater Power in Percent 50 CTR 80 User s Manual Chapter 8 Controller Operation 8 8 Cutout cont To change the cutout set point press UP or DOWN 3 CO 70C New Cutout Set point To accept the new cutou
34. ge condition exists for longer than 5 seconds the compressor will be de energized The controller display will flash Lo LinE on and off while the condition exists Re energization is automatic upon correction of the fault condition and after a delay cycle of about 2 minutes High and Low Voltage Protection at 115 VAC Voltage Cutout 12 5 101 129 VAC Voltage Cut In 7 5 106 124 VAC High and Low Voltage Protection at 230 VAC Voltage Cutout 12 5 203 257 VAC Voltage Cut In 7 5 213 247 VAC See the Caution in the front of this manual for additional information CTR 80 User s Manual Chapter 12 Troubleshooting 12 3CE Comments 12 3 1 EMC Directive This instrument has been tested to meet the European Electromagnetic Compatibility Directive EMC Directive 89 336 EEC The Declaration of Conformity for your instrument lists the specific standards to which the unit was tested 12 3 2 Low Voltage Directive Safety In order to comply with the European Low Voltage Directive 73 23 EEC this instrument has been designed to meet the IEC 1010 1 EN 61010 1 and IEC 1010 2 010 EN 61010 2 010 standards CTR 80 User s Manual 75 Chapter 12 Troubleshooting no content intended for this page proceed to next page 76 CTR 80 User s Manual Warranty Warranty Each instrument manufactured by GE Sensing is warranted to be free from defects in material and workmanship Liabilit
35. h by pulsing the heater on and off The total power being applied to the heater is determined by the duty cycle or the ratio of heater on time to the pulse cycle time By knowing the amount of heating the user can tell if the calibrator is heating up to the set point cooling down or controlling at a constant temperature Monitoring the percent heater power will let the user know how stable the bath temperature is The heater power display 15 accessed in the secondary menu Press SET and EXIT simultaneously and release The heater power will be displayed as a percentage of full power 12 0 P Heater Power in Percent To exit out of the secondary menu hold EXIT To continue on to the proportional band setting function press EXIT momentarily or SET CTR 80 User s Manual 47 Chapter 8 Controller Operation 8 7 Proportional Band In a proportional controller such as this the heater output power is proportional to the well temperature over a limited range of temperatures around the set point This range of temperature is called the proportional band At the bottom of the proportional band the heater output is 10096 At the top of the proportional band the heater output is 0 Thus as the temperature rises the heater power is reduced which consequently tends to lower the temperature back down In this way the temperature is maintained at a fairly constant temperature The temperature stability of the bath and response time depend on the wi
36. h temperature exceeds the maximum temperature The controller allows the operator to set the bath temperature with high resolution adjust the proportional band monitor the heater output power and program the controller configuration and calibration parameters The controller may be operated in temperature units of degrees Celsius or Fahrenheit The controller is operated and programmed from the front control panel using the four key switches and digital LED display The controller is equipped with a serial RS 232 digital interface for remote operation Operation of the controller using the front control panel is discussed following in Chapter 8 Operation using the digital interfaces is discussed in Chapter 9 When the controller is set to a new set point the bath heats or cools to the new temperature Once the new temperature is reached the bath usually takes 15 20 minutes for the temperature to settle and stabilize There may be a small amount of overshoot or undershoot 40 CTR 80 User s Manual Chapter 8 Controller Operation Chapter 8 Controller Operation 8 1 Introduction This section discusses in detail how to operate the bath temperature controller using the front control panel Using the front panel key switches and LED display the user may monitor the bath temperature set the temperature set point in degrees C or F monitor the heater output power adjust the controller proportional band and program the calibration paramete
37. he cooling switch to OFF for temperatures above approximately 50 C Set the switch to ON for lower temperatures When the cooling switch has been turned on the first stage compressor will power up The second stage will come on automatically when proper conditions are met This will take 2 to 4 minutes Cooling in the bath will not begin until the second stage starts CTR 80 User s Manual 17 Chapter 3 Quick Start 3 5 Setting the Temperature In the following discussion and throughout this manual a solid box around the word SET UP DOWN or EXIT indicates the panel button to press while the dotted box indicates the display reading on the front panel Explanation of the button function or display reading is written at the right To view or set the bath temperature set point proceed as follows The front panel LED display normally shows the actual bath temperature 24 68 C Bath Temperature Display When SET is pressed the display shows the set point memory that is currently being used and its value Eight set point memories are available Access Set point Selection 1 25 0 Current Value of Set point 1 25 006 Access Set point Value C 25 00 Current Value of Set point 1 25 00 C Increment Display C 30 00 New Set point Value 30 00 C 18 CTR 80 User s Manual Chapter 3 Quick Start 3 5 Setting the Temperature cont Press SET to accept the new value The bath begins heating or cooling to the new set po
38. ich determines a unique command A command may be used to either set a parameter or display a parameter depending on whether or not a value is sent with the command following a character For example s lt CR gt will return the current set point and s 150 0 CR will set the set point to 150 0 degrees In the following list of commands characters or data within brackets and are optional for the command A slash denotes alternate characters or data Numeric data denoted by n may be entered in decimal or exponential notation Characters are shown in lower case although upper case may be used Spaces may be added within command strings and will simply be ignored Backspace BS ASCII 8 may be used to erase the previous character A terminating CR is implied with all commands 64 CTR 80 User s Manual Chapter 9 Digital Communications Interface 9 4 Interface Commands cont Table 3 Controller Communications Commands Command Command Command Returned Acceptable Description Format Example Returned Example Values Display Temperature Read currentset s etpoint S set 999 99 C set 90 00 C point or F Set current set sletpoint n s 80 00 Instrument point to n Range Read temperature tlemperature t t99999 Cor t 55 6C F Read temperature ulnits u U X uc units Set temperature ulnits c f units Set temperature ulnits c U C CorF units to Celsius Set
39. installation Examples include household office and laboratory appliances C TIC Australian EMC mark 1 1 1 Safety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired Refer to the safety information below The following definitions apply to the terms Warning and Caution Warning identifies conditions and actions that may pose hazards to the user Caution identifies conditions and actions that may damage the instrument being used 2 CTR 80 User s Manual Chapter 1 Before You Start 1 1 2 Warnings A To avoid personal injury follow these guidelines WARNING DO NOT use the instrument for any application other than calibration work The instrument was designed for temperature calibration Any other use of the unit may cause unknown hazards to the user DO NOT use the unit in environments other than those listed in the user s guide DO NOT overfill the bath Overflowing extremely cold or hot fluid may be harmful to the operator See the section Bath Preparation and Filling page 22 for specific instructions Follow all safety guidelines listed in the user s manual Calibration Equipment should only be used by Trained Personnel CTR 80 User s Manual 3 Chapter 1 Before You Start Warnings cont WARNING If this equipment is used in a manner not specified by the manufacturer the protection provide
40. int Store New Set point Press EXIT and the bath temperature will be displayed again en Return to the Temperature Display 24 73 C Bath Temperature Display 24 736 The bath heats or cools until it reaches the new set point temperature Turn off the cooling to reach and control at higher temperatures When setting the set point temperature be careful not to exceed the temperature limit of the bath fluid To obtain optimum control stability adjust the proportional band as discussed on page 48 CTR 80 User s Manual 19 Chapter 3 Quick Start no content intended for this page proceed to next page 20 CTR 80 User s Manual Chapter 4 Installation Chapter 4 Installation 4 1 Bath Environment CAUTION Chapter 5 Bath Use before placing the bath in service Incorrect handling can damage the bath and void the warranty The CTR 80 Bath is a precision instrument which should be located in an appropriate environment The location should be free of drafts extreme temperatures and temperature changes dirt etc The surface where the bath is placed must be level Allow at least six inches around the bath for air circulation The top surface of the bath may become hot at high temperatures Beware of the danger of accidental fluid spills A fume hood should be used to remove any vapors given off by hot bath fluid 4 2 Dry out Period Before initial use after transport and any time the instrument has not been
41. int of the bath fluid See Table 2 on page 36 for specific information on bath fluids and the section Cutout page 50 Setup of the bath requires careful unpacking and placement of the bath filling the bath with fluid and connecting power Consult Chapter 4 for detailed instructions for proper installation of the bath Be sure to place the bath in a safe clean and level location Fill the bath tank with an appropriate liquid For operation at moderate bath temperatures clean distilled water works well For lower temperatures ethanol denatured works well but is NOT USABLE AT HIGHER TEMPERATURES due to flammability Carefully pour the fluid into the bath tank through the large rectangular access hole above the tank avoiding spilling any fluid The fluid must not exceed a height of 1 2 inch below the top of the tank or be less than 2 inches below the top 16 CTR 80 User s Manual Chapter 3 Quick Start 3 4 Power Plug the bath power cord into a mains outlet of the proper voltage frequency and current capability See Chapter 2 Specifications and Environmental Conditions for power details Refer to and read the CAUTION at the front of this manual concerning brownout and over voltage protection Turn the bath on using the front panel POWER switch The bath will turn on and begin to heat or cool to reach the previously programmed temperature set point The front panel LED display will indicate the actual bath temperature Set t
42. ke for fixing the problem Incorrect Temperature Reading Power the unit on and watch the display If the first number displayed is less than 0005 the unit has been reinitialized The unit needs to be reprogrammed for RO ALPHA DELTA and BETA These numbers can be found on the Report of Calibration that was shipped with the unit The Unit Heats Slowly Check the Scan and Scan Rate settings The Scan may be on with the Scan Rate set low If the display flashes any of the following err 1 This error means there is a RAM error err 2 This error means there is a NVRAM error err 3 This error means there is a RAM error err 4 This error means there is an ADC set up error err 5 This error means there is an ADC ready error err 6 This error means there is a SENSOR error err 7 This error means there is a HtrCTL error Cycle the power off and on again If the unit repeats the error code contact GE Customer Support for a return authorization and for assistance CTR 80 User s Manual 73 Chapter 12 Troubleshooting 12 2 Troubleshooting cont The bath does not turn on 74 Ifa fault condition exists upon application of power the bath will not energize This bath needs to be plugged into the line voltage for at least 2 minutes before turning power on This is only necessary for the first time that the bath is energized or when it is moved from one location to another Ifa High Low volta
43. l 29 Chapter 6 Parts and Controls 6 5 Back Panel On the back of the bath are 1 the circuit breaker 2 the IEC power connector 3 the drain valve 4 the RS 232 interface connector and 5 removable vent panel A CIRCUIT BREAKER A POWER Figure 2 Back Panel 1 The circuit breakers are 15 A 250 V for 115 VAC operation and 8 A 250 V for 230 VAC operation 2 The power cord is rated at 115 VAC 15 amps 230 VAC 10 amps optional 3 A drain valve is provided for ease of removing the fluid media from the bath Always use a container of adequate size to hold the FULL LOAD of fluid Some oils are more easily drained at higher temperatures CAUTION Do not exceed a 100 C fluid temperature for draining The valve could be damaged if 100 C is exceeded Insulate the container from the floor and other objects 4 The serial RS 232 interface attaches to the back of the bath at the connector labeled RS 232 5 The removable vent panel can be removed to access the condenser for cleaning See Chapter 11 Maintenance 30 CTR 80 User s Manual Chapter 7 General Operation Chapter 7 General Operation 7 1 Bath Fluid Many fluids work with the CTR 80 bath Choosing a fluid requires consideration of many important characteristics of the fluid Among these are temperature range viscosity specific heat thermal conductivity thermal expansion electrical resistivity fluid lifetime safety and cost If the visco
44. l Number e Voltage Complete description of the problem 10 CTR 80 User s Manual Chapter 2 Specifications and Environmental Conditions Chapter 2 Specifications and Environmental Conditions 2 1 Introduction The Kaye CTR 80 is an ultra low temp bath useful in temperature calibration and other applications requiring stable temperatures An innovative state of the art solid state temperature controller has been incorporated which maintains the bath temperature with extreme stability The temperature controller uses a micro controller to execute the many operating functions The user interface is provided by the 8 digit LED display and four key switches Digital remote communications is available with an RS 232 interface The CTR 80 was designed to be compact and low cost without compromising performance The CTR 80 operates over a wide temperature range from 80 C to 30 C and from 50 C to 100 C CTR 80 User s Manual 11 Chapter 2 Specifications and Environmental Conditions 2 2 Specifications 2 2 1 Range 80 C to 100 C 112 F to 212 F 2 2 2 Ambient Operating Range 15 C to 25 C 59 F to 77 F 2 2 5 Stability 10 006 at 80 C ethanol 0 010 C at 0 C ethanol 0 010 C at 100 C oil 2 2 4 Uniformity 0 008 C at 80 C ethanol 0 012 C at 0 C ethanol 0 012 C at 100 C oil 2 2 5 Set Point Accuracy 0 5 C 2 2 6 Set Point Repeatability 0 01 C 2 2 7 R
45. le setting Set serial sampling salmple n 0 to 999 setting to n seconds ial duplex dulplex f ull FULL or HALF h alf ial duplex dulplex f ull o full ial duplex dulplex h alf o half iallinefeed Ifleed 0n of f ON or OFF iallinefeed Ifleedl on If on o on ial linefeed Ifleed of f Ifzof Calibration Menu Read RO r o rO 999 999 rO 100 578 calibration parameter Set RO calibration r 0 2n r 100 324 90 to 110 parameter to n Read ALPHA al pha al al 9 9999999 al 0 0038573 ibrati rame Set ALPHA allphal n al 0 0038433 002 to 0 005 ibrati rameter to n ad DELTA delita de 9 99999 de 1 507 ibration parameter dellta CTR 80 User s Manual 67 Chapter 9 Digital Communications Interface Table 3 Controller Communications Commands Continued Command Command Command Returned Acceptable Description Format Example Returned Example Values Set DELTA delltaJ n de 1 3742 0 3 0 ibrati rame ad BETA be 99 999 be 03427 ibrati rame Set BETA be 0 342 20 to 20 calibration parameter Functions Not on Menu Read firmware ver sion ver9999 99 ver7103 2 00 version number Read structure of h elp list of all commands commands Read all operating all all list of parameters parameters Legend Optional Command data Returns either information n Numeric data supplied by user 9 Numeric data returned to user Character data returned to user Note When
46. mp Configuration Menu SET A EXIT Y Operating Serial Parameters Menu Menu Legend Press SET to step through the menu and to store the parameter value Press EXIT briefly to skip a parameter without storing the parameter value Hold EXIT to exit the menu and display the temperature Adj LL s e coo Adj COOL Figure 3 Controller Operator Flowchart 42 CTR 80 User s Manual Chapter 8 Controller Operation 8 3 Temperature Set point The temperature set point can be set to any value within the range and resolution as given in the specifications Be careful not to exceed the safe temperature limits of any devices inserted into the bath Setting the temperature involves two steps 1 select the set point memory and 2 adjust the set point value To protect the refrigeration system from excessive pressures it will not operate above 50 C 8 3 1 Programmable Set points The controller stores 8 set point temperatures in memory The set points can be quickly recalled to conveniently set the calibrator to a previously programmed temperature set point To set the temperature one must first select the set point memory This function is accessed from the temperature display function by pressing SET The number of the set p
47. mum temperature are set to 90 C For safety a user can adjust the Low Limit up so the minimum temperature set point is restricted LL Low Limit Parameter LL Flashes and then Displays E DX US AE E the Setting L 90 Current LL Setting L 20 New LL Setting Press SET to accept the new temperature limit CTR 80 User s Manual 53 Chapter 8 Controller Operation 8 11 Cooling This menu function allows the operator to disable cooling and corresponds to the remote cooling control function see Table 3 on page 65 Switching the cooling off temporarily allows the bath to heat up more quickly from a low temperature Cooling can be manually switched off using the cooling switch on the front panel or automatically switched off any time the bath temperature or set point is higher than about 35 C As a result cooling is ON only if the cooling function is ON the cooling switch is ON and both the bath temperature and the set point are less than about 35 C The cooling function is indicated by CooL Flashes CooL and then Displays ee es the Setting 54 CTR 80 User s Manual Chapter 8 Controller Operation 8 12Serial Interface Parameters The serial RS 232 interface parameters menu is indicated by Serial RS 232 Interface SErIAL parameters Menu The serial interface parameters menu contains parameters which determine the operation of the serial interface These controls only apply to instruments fitted with
48. nce between the connector DB 9 and the shield If the unit is used in a heavy industrial setting the serial cable must be limited to ONE METER in length Instrument Computer DTE Connector Connector DB 9 Pin DB 9 Pin 1NC e 1DCD 2 RxD 2 RxD 3TxD 3TxD 4NC z 4 DTR 5 GND 5 GND 6NC E 6 DSR 7RTS 7 RTS 8CTS 8CTS 9NC 9NC Instrument Computer DTE Connector Connector DB 9 Pin DB 25 Pin 1NC e 2 RxD e e 2TxD 3TxD e 3 RxD 4NC e 4 RTS 5 GNDe 5CTS 6NC e 6 DSR 7RTS 7 GND 8 CTS 8 DCD 9NC 20 DTR Figure 4 RS 232 Cable Wiring for IBM PC and Compatibles 62 CTR 80 User s Manual Chapter 9 Digital Communications Interface 9 3 1 Setup Before operation the serial interface must first be set up by programming the baud rate and other configuration parameters These parameters are programmed within the serial interface menu The serial interface parameters menu is outlined in Figure 3 on page 42 To enter the serial parameter programming mode first press EXIT while pressing SET and release to enter the secondary menu Press SET repeatedly until the display reads PAr Press UP until the serial interface menu is indicated with SErlAL Finally press SET to enter the serial parameter menu In the serial interface parameters menu are the baud rate the sample rate the duplex mode and the linefeed parameter 9 51a Baud Rate The baud rate is the first paramet
49. nt is an HFC known as R 507 The second stage performs the ultra low cooling Its refrigerant is an HFC R 508B also known as SUVA 95 What this means to you e The cascade system is complex and its uncommon nature means that many local refrigeration service technicians may not be able to service it If your bath needs service call GE Customer Service e The compressor manufacturer does not warranty their compressors when used with non standard refrigerants Warranty of these compressors must be handled through GE only There is no other way for you to receive parts or service on your compressor You must receive your parts or service from GE Measurement amp Control CTR 80 User s Manual 39 Chapter 7 General Operation 7 6 Temperature Controller The bath temperature is controlled by a special digital temperature controller The controller features a 24 bit analog to digital converter DAC that gives it remarkable accuracy and stability The bath temperature is monitored with a platinum resistance sensor in the control probe The controller uses a proportional integral derivative PID algorithm to determine how much heat the bath needs The bath 15 heated by a solid state relay SSR controlled 500 W heater The bath is operable within the temperature range given in the specifications For protection against solid state relay failure or other circuit failure a thermocouple cutout automatically turns off the heater anytime the bat
50. ntrols 6 2 Bath Tank and Use cont The control probe provides the temperature feedback signal to the controller allowing the controller to maintain a constant temperature The control probe is a precision platinum resistance thermometer PRT It is delicate and must be handled carefully The probe is placed in the small hole in the top of the bath so that the probe tip is fully immersed in the bath fluid It is located underneath the motor cover The stirring motor is mounted on the bath tank lid under the motor cover It drives the stirring propeller to provide mixing of the bath fluid Proper mixing of the fluid is important for good constant temperature stability On the bath lid is a work area access hole This is used for filling the bath with fluids and placement of thermometers and devices into the bath When possible the access hole should be covered must be covered to reach minimum temperatures An insulated access hole cover is provided and should be used to cover the access opening in the top of the bath This improves bath temperature stability prevents excess fluid evaporation or fumes and increases safety with hot fluid The user may drill or cut holes in the cover to accommodate the instruments to be calibrated or immersed in the bath Spare covers are available from GE An optional access cover which provides locations for two reference thermometers and three wells for units under test is available CTR 80 User s Manua
51. oil since it is flammable and may also cause serious injury if inhaled or ingested 34 CTR 80 User s Manual Chapter 7 General Operation 7 1 9d Silicone Oil Dow Corning 200 05 200 10 200 20 Silicone oils are available which offer a much wider operating temperature range than mineral oil Like most oils silicone oils have temperature control characteristics which are somewhat poorer than water The viscosity changes significantly with temperature and thermal expansion also occurs These oils have very high electrical resistivity Silicone oils are fairly safe and non toxic Silicone oils are fairly expensive Halocarbon 0 8 Halocarbon 0 8 is a low temperature fluid with a wide temperature range It may be used as low as 90 to 100 C before viscosity becomes too great It may be used as high as 70 C before evaporation becomes excessive Halocarbon does not absorb water and will therefore form ice at temperatures below 0 C Ice crystals turn the fluid into a slush which effectively increases the viscosity and reduces temperature stability Pumping systems may be rendered ineffective due to ice blockage The ice water can be removed occasionally by heating the fluid up to 100 C for brief periods of time Use halocarbon under a fume hood at higher temperatures to remove vapors Toxicity is low but caution is always recommended Halocarbon has excellent electrical resistivity This fluid is fairly expensive 7 1 10 Fluid Chara
52. oint memory currently being used is shown at the left on the display followed by the current set point value SET Access Set point Memory RM EE Set point Memory 1 1 25 0 25axC Currently Use CTR 80 User s Manual 43 Chapter 8 Controller Operation 8 3 1 Programmable Set points cont To change the set point memory press UP or DOWN 4 25 0 New Set point Memory 4 A125 Press SET to accept the new selection and access the set point value SET Accept Selected Set point Memory 8 3 2 Set point Value The set point value may be adjusted after selecting the set point memory and pressing SET If the set point value 15 correct hold EXIT to resume displaying the well temperature Press UP or DOWN to adjust the set point value When the desired set point value is reached press SET to accept the new value and access the temperature scale units selection If EXIT is pressed instead of SET any changes made to the set point are ignored Accept New Set point Value 44 CTR 80 User s Manual Chapter 8 Controller Operation 8 3 5 Temperature Scale Units The temperature scale units of the controller can be set by the user to degrees Celsius C or Fahrenheit F The selected units are used in displaying the well temperature set point and proportional band Press SET after adjusting the set point value to change display units 8 4 Scan The scan rate can be set and enabled so that when the set point is
53. osity may vary greatly with temperature When using fluids with higher viscosities the controller proportional band may need to be increased to compensate for the reduced response time see page 48 Otherwise the temperature may begin to oscillate CTR 80 User s Manual 31 Chapter 7 General Operation 7 1 3 Specific Heat Specific heat is the measure of the heat storage ability of the fluid Specific heat to a small degree affects the control stability It also affects the heating and cooling rates Generally a lower specific heat means quicker heating and cooling The proportional band may require some adjustment depending on the specific heat of the fluid 7 1 4 Thermal Conductivity Thermal conductivity measures how easily heat flows through the fluid Thermal conductivity of the fluid affects the control stability temperature uniformity and probe temperature settling time Fluids with higher conductivity distribute heat more quickly and evenly improving bath performance 7 1 5 Thermal Expansion Thermal expansion describes how the volume of the fluid changes with temperature Thermal expansion of the fluid used must be considered since the increase in fluid volume as the bath temperature changes may cause overflow Excessive thermal expansion may also be undesirable in applications where constant liquid level is important Many fluids including oils have significant thermal expansion 7 1 6 Electrical Resistivity El
54. ou Start 1 1 4 Cautions Cold Baths CAUTION CTR 80 User s Manual Refrigerated baths require that the condensing coil be cleaned periodically Accumulation of dust and dirt on the condenser will result in premature failure of the compressor This bath has been equipped with a brownout and over voltage protection device as a safety feature to protect the system components Mode of Operation This bath needs to be plugged into the line voltage for at least 2 minutes before operation This is only necessary for the first time that the bath is energized or when it is moved from one location to another Turning the bath ON or OFF does not trigger the delay If a High Low voltage condition exists for longer than 5 seconds the bath de energizes An amber indicator on the back panel lights when this condition exists Re energization is automatic upon correction of the fault condition and after a delay cycle of about 2 minutes If a fault condition exists upon application of power the bath will not energize Under and Over Voltage Protection at 115 VAC Voltage Cutout 12 5 101 129 VAC Voltage Cut In 7 5 106 124 VAC Under and Over Voltage Protection at 230 VAC Voltage Cutout 12 5 203 257 VAC Voltage Cut In 7 5 213 247 VAC Chapter 1 Before You Start 1 1 5 Customer Service Information When contacting GE Customer Service please have the following information available e Model Number e Seria
55. r response The stirrer is precisely adjusted for optimum performance CTR 80 User s Manual 37 Chapter 7 General Operation 7 5 Power Power to the bath is provided by an AC mains supply See Chapter 2 Specifications and Environmental Conditions for power details Refer to and read the CAUTION at the front of this manual concerning brownout and over voltage protection Power to the bath passes through a filter to prevent switching spikes from being transmitted to other equipment To turn on the bath switch the control panel power switch to the ON position The stirring motor will turn on the LED display will begin to show the bath temperature and the heater will turn on or off until the bath temperature reaches the programmed set point When powered on the control panel display will briefly show a four digit number This number indicates the number of times power has been applied to the bath Also briefly displayed is data which indicates the controller hardware configuration This data is used in some circumstances for diagnostic purposes 7 4 Heater The power to the bath heater 1s precisely controlled by the temperature controller to maintain a constant bath temperature Power is controlled by periodically switching the heater on for a certain amount of time using a solid state relay The front panel LED heater mode shows the state of the heater The indicator glows red when the heater is on and is off when the heater is off Th
56. rs operating parameters and serial interface configuration Operation of the functions and parameters are shown in the flowchart in Figure 3 on the next page This chart may be copied for reference In the following discussion a button with the word SET UP EXIT or DOWN inside indicates the panel button while the dotted box indicates the display reading Explanation of the button or display reading are to the right of each button or display value 8 2 Bath Temperature The digital LED display on the front panel allows direct viewing of the actual bath temperature This temperature value is what 1s normally shown on the display The units C or F of the temperature value are displayed at the right For example 10 00 C Bath Temperature in Degrees Celsius The temperature display function may be accessed from any other function by pressing the EXIT button CTR 80 User s Manual 41 Chapter 8 Controller Operation Display Temperature Bi SET Select Setpoint p SET DOWN Display of Rs Adjust Setpoint BP SET UP H Toggles C F 4 Units C F Secondary Functions SET EXIT Scan On Off 14 31 Display Power Scan Rate Set Proportional Band Cut out 2 M Set Cut out Te
57. sity becomes too great the stirrer may not function 7 1 4 Temperature Range One of the most important characteristics to consider is the temperature range of the fluid Few fluids work well throughout the complete temperature range of the bath The temperature at which the bath is operated must always be within the safe and useful temperature range of the fluid Set the cutout to meet the temperature limits of the selected fluid The lower temperature range of the fluid 1s determined by the freeze point of the fluid or the temperature at which the viscosity becomes too great The upper temperature is usually limited by vaporization flammability or chemical breakdown of the fluid Vaporization of the fluid at higher temperatures may affect temperature stability because of cool condensed fluid dripping into the bath from the lid 7 1 2 Viscosity Viscosity is a measure of the thickness of a fluid how easily it can be poured and mixed Viscosity affects the temperature stability of the bath With low viscosity fluid mixing is better which creates a more uniform temperature throughout the bath This improves the bath response time which allows it to maintain a more constant temperature For good control the viscosity should be less than ten centistokes Twenty centistokes is about the upper limit of allowable viscosity Viscosities greater than this cause very poor control stability and may also overheat or damage the stirring motor With oils visc
58. t set point press SET s Accept Cutout Set point The next function is the configuration menu Press EXIT to resume displaying the temperature 8 9 Controller Configuration The controller has a number of configuration and operating options and calibration parameters which are programmable via the front panel These are accessed from the secondary menu after the proportional band function by pressing SET Pressing SET again enters the first of three sets of configuration parameters operating parameters serial interface parameters and calibration parameters The menus are selected using the UP or DOWN keys and then pressing SET See Figure 3 on page 42 CTR 80 User s Manual 51 Chapter 8 Controller Operation 8 10 Operating Parameters The operating parameters menu is indicated by The operating parameters menu contains the High Limit Stir Speed and Cooling parameters 8 10 1 High Limit The High Limit Parameter adjusts the upper set point temperature The factory default and maximum temperature are set to 100 C For safety a user can adjust the High Limit down so the maximum temperature set point is restricted HL Flashes HL and then Displays theSetting H 90 New HL Setting Press SET to accept the new temperature limit 52 CTR 80 User s Manual Chapter 8 Controller Operation 8 10 2 Low Limit The Low Limit LL Parameter adjusts the lower set point temperature limit The factory default and mini
59. temperature ulnits f u f units to Fahrenheit Read scan mode sc an SC scan ON or scan ON OFF Set scan mode sclan on off sc on ON or OFF Read scan rate srlate sr srat 99 9 Cor srat 12 4C min F min Set scan rate srlate n sr 1 1 0 1 to 99 9 CTR 80 User s Manual 65 Chapter 9 Digital Communications Interface Table 3 Controller Communications Commands Continued Command Command Command Returned Acceptable Description Format Example Returned Example Values Secondary Menu Read proportional prlopband pr pb 999 9 pb 15 9 band setting Set proportional pr opband n pr 8 83 Depends on band to n Configuration Read cut out cultout cu cu 9999 Cor cu 105 C in setting F Set cut out setting cultout n cu 95 25 to 115 C to n degrees Read heater polwer po po 999 9 po 1 0 power duty cycle Configuration Menu Operating Parameters Menu Read high limit hl hl hl 999 hl 126 Set high limit hl n hl 90 25 to 100 Read low limit Il Il 11 999 Il 90 Set low limit ll n l 90 90 to 25 Read cooling colol co cool ON or cool ON setting OFF Set cooling setting colol l on of f cozon ON or OFF 66 CTR 80 User s Manual Chapter 9 Digital Communications Interface E E UE EEUU EN UE Table 3 Controller Communications Commands Continued Command Command Command Returned Acceptable Description Format Example Returned Example Values Serial Interface Menu Read serial sa mple sa 1 samp
60. ter 2 Because of the way the calibration parameters affect the temperature the simplest way to proceed is to measure the errors at 0 C 100 C 50 C and 70 C and adjust RO ALPHA DELTA and BETA at each point respectively Be aware that you must use the appropriate fluid at each temperature CTR 80 User s Manual 69 Chapter 10 Calibration Procedure 10 3 Calibration cont Follow these steps 70 Set the set point to 0 C and allow adequate time for the bath to reach this temperature and stabilize Adjust the RO calibration parameter see page 59 to make the bath temperature as measured with the standard thermometer match the set point The approximate ratio between a change in RO and a change in temperature at 0 C is about 0 4 to 1 For example if the bath temperature is high by 0 1 C at 0 C then decrease RO by 0 04 Set the set point to 100 C and allow adequate time for the bath to reach this temperature and stabilize Adjust the ALPHA calibration parameter see page 59 to make the bath temperature as measured with the standard thermometer match the set point The approximate ratio between a change in ALPHA and a change in temperature at 100 C is about 0 00004 to 1 For example if the bath temperature is high by 0 1 C at 100 C then decrease ALPHA by 0 000004 Set the set point to 50 C and allow adequate time for the bath to reach this temperature and stabilize Adjust the DELTA calibration parameter see page
61. the return of the instrument to a service center will be provided If GE Sensing instructs you to send your instrument to a service center it must be shipped prepaid to the authorized repair station indicated in the shipping instructions Upon receipt GE Sensing will evaluate the instrument to determine the cause of the malfunction Then one of the following courses of action will then be taken 78 If the damage is covered under the terms of the warranty the instrument will be repaired at no cost to the owner and returned If GE Sensing determines that the damage is not covered under the terms of the warranty or if the warranty has expired an estimate for the cost of the repairs at standard rates will be provided Upon receipt of the owner s approval to proceed the instrument will be repaired and returned CTR 80 User s Manual Customer Support Centers U S A For Sales and Services Repair Calibration GE Measurement amp Control St Marys Center 967 Windfall Road St Marys Pennsylvania 15857 U S A T 814 834 9140 F 814 781 7969 stmaryscc ge com Europe Asia and Middle East Sales and Service GE Sensing amp Inspection Technologies GmbH Sinsheimer Strasse 6 D 75179 Pforzheim Germany T 49 0 7231 14335 0 F 49 0 7212 391 035 E mail CCOPforzheimGge com Brazil Sales and Service GE Measurement amp Control Avenida Maria Coelho Aguiar 215 Bloco C 6 andar Jd Sdo Luiz 56
62. the serial interface The parameters in the menu are baud rate sample period duplex mode and linefeed Press UP to enter the menu 8 12 1 Baud Rate The baud rate is the first parameter in the menu The baud rate setting determines the serial communications transmission rate The baud rate parameter is indicated by The baud rate of the serial communications may be programmed to 300 600 1200 2400 4800 or 9600 baud Use UP or DOWN to change the baud rate value 4800 b New Baud Rate Press SET to set the baud rate to the new value or EXIT to abort the operation and skip to the next parameter in the menu CTR 80 User s Manual 55 Chapter 8 Controller Operation 8 12 2 Sample Period The sample period is the next parameter in the serial interface parameter menu It is the time period in seconds between temperature measurements transmitted from the serial interface If the sample rate is set to 5 the instrument transmits the current measurement over the serial interface approximately every five seconds The automatic sampling is disabled with a sample period of 0 The sample period is indicated by Adjust the value with UP or DOWN and then use SET to store the sample rate to the displayed value EXIT does not store the new value SP 50 New Sample Period 56 CTR 80 User s Manual Chapter 8 Controller Operation 8 12 3 Duplex Mode The next parameter is the duplex mode The duplex mode may be set to full duplex or hal
63. these parameters is important to the safety and proper operation of the bath The calibration parameters menu is indicated by CAL Calibration Parameters Menu Press SET five times to enter the menu The calibration parameters RO ALPHA DELTA and BETA characterize the resistance temperature relationship of the platinum control sensor These parameters may be adjusted by an experienced user to improve the accuracy of the bath 58 CTR 80 User s Manual Chapter 8 Controller Operation 8 13 1 Hard Cutout This parameter is the temperature above which the unit shuts down automatically The parameter is set at the factory to approximately 120 C and can be changed only through the variable resistor This parameter cannot be changed through the instrument menu or the communications port and 15 user settable 8 13 2 Ro This probe parameter refers to the resistance of the control probe at 0 C The value of this parameter is set at the factory for best instrument accuracy 8 13 3 ALPHA This probe parameter refers to the average sensitivity of the probe between 0 and 100 C The value of this parameter is set at the factory for best instrument accuracy 8 13 4 DELTA This probe parameter characterizes the curvature of the resistance temperature relationship of the sensor The value of this parameter 1s set at the factory for best instrument accuracy 8 13 5 BETA This probe parameter characterizes the low temperatures The valu
64. to be calibrated as closely grouped as possible in the working area of the bath Bath stability is maximized when the bath working area is kept covered In preparing to use the bath for calibration start by Placing the reference probe in the bath working area Placing the probe to be calibrated the UUT in the bath working area as close as feasibly possible to the reference probe 5 3 1 Calibration of Multiple Probes Fully loading the bath with probes increases the time required for the temperature to stabilize after inserting the probes Using the reference probe as the guide be sure that the temperature has stabilized before starting the calibration CTR 80 User s Manual 25 Chapter 5 Bath Use no content intended for this page proceed to next page 26 CTR 80 User s Manual Chapter 6 Parts and Controls Chapter 6 Parts and Controls 6 1 Control Panel The following controls and indicators are present on the controller front panel see Figure 6 1 on the next page 1 the digital LED display 2 the control buttons 3 the on off power switch 4 the heater mode light and 5 the cooling on off switch 1 The digital display is an important part of the temperature controller It displays the set point temperature and bath temperature as well as the various other bath functions settings and constants The display shows temperatures according to the selected scale units C or F 2 The control buttons
65. training of plant personnel Contact Customer Service for details 14 CTR 80 User s Manual Chapter 3 Quick Start Chapter 3 Quick Start 3 1 Introduction CAUTION AN Read Chapter 5 Bath Use before placing the bath in service Incorrect handling can damage the bath and void the warranty This chapter gives a brief summary of the steps required to set up and operate the bath This should be used as a general overview and reference and not as a substitute for the remainder of the manual Please read Chapters 4 through 7 carefully before operating the bath 3 2 Unpacking Unpack the bath carefully and inspect it for any damage that may have occurred during shipment If there is shipping damage notify the carrier immediately Verify that all components are present e CTR 80 Bath Access Hole Cover e Manual e RS 232 Cable Report of Test CTR 80 User s Manual 15 Chapter 3 Quick Start 3 5 Setup CAUTION A drain valve must be closed on the back of the bath before attempting to fill the tank with fluid WARNING A instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the flash point boiling point or other fluid characteristic applicable to the circumstances of the unit operation Ensure that the soft cutout is adjusted to the fluid characteristics of the application As a guideline the soft cutout should be set 10 C to 15 C below the flash po
66. ument must be plugged into a 115 VAC 60 Hz 230 VAC 50 Hz optional AC only electric outlet The power cord of the instrument is equipped with a three pronged grounding plug for your protection against electrical shock hazards It must be plugged directly into a properly grounded three prong receptacle The receptacle must be installed in accordance with local codes and ordinances Consult a qualified electrician DO NOT use an extension cord or adapter plug DO use a ground fault interrupt device This unit contains a liquid A ground fault device is advised in case liquid is present in the electrical system and could cause an electrical shock Always replace the power cord with an approved cord of the correct rating and type If you have questions contact GE Sensing Customer Service High voltage is used in the operation of this equipment Severe injury or death may result if personnel fail to observe the safety precautions Before working inside the equipment turn off the power and disconnect the power cord CTR 80 User s Manual 5 Chapter 1 Before You Start Warnings cont IBATH FLUIDS Fluids used in this unit may produce noxious or toxic fumes under certain circumstances Consult the fluid manufacturer s MSDS Material Safety Data Sheet Proper ventilation and safety precautions must be observed The instrument is equipped with a soft cutout user settable firmware and a hard cutout set at the factory Check the fl
67. y be changed using UP or DOWN and pressing SET CTR 80 User s Manual 63 Chapter 9 Digital Communications Interface 9 5 1d Linefeed The final parameter in the serial interface menu is the linefeed mode This parameter enables On or disables OFF transmission of a linefeed character LF ASCII 10 after transmission of any carriage return The default setting is linefeed off The mode may be changed using UP or DOWN and pressing SET 9 3 2 Serial Operation Once the cable has been attached and the interface set up properly the controller will immediately begin transmitting temperature readings at the programmed rate The serial communications uses 8 data bits one stop bit and no parity The set point and other commands may be sent via the serial interface to set the temperature set point and view or program the various parameters The interface commands are discussed on the next page All commands are ASCII character strings terminated with a carriage return character CR ASCII 13 9 4 Interface Commands The various commands for accessing the calibrator functions via the digital interfaces are listed in this section see Table 9 1 on the next page These commands are used with the RS 232 serial interface The commands are terminated with a carriage return character The interface makes no distinction between upper and lower case letters hence either may be used Commands may be abbreviated to the minimum number of letters wh
68. y under this warranty is limited to restoring the instrument to normal operation or replacing the instrument at the sole discretion of GE Sensing Fuses and batteries are specifically excluded from any liability This warranty is effective from the date of delivery to the original purchaser If GE Sensing determines that the equipment was defective the warranty period is one year for general electronic failures of the instrument one year for mechanical failures of the sensor If GE Sensing determines that the equipment was damaged by misuse improper installation the use of unauthorized replacement parts or operating conditions outside the guidelines specified by GE Sensing the repairs are not covered under this warranty The warranties set forth herein are exclusive and are in lieu of all other warranties whether statutory express or implied including warranties or merchantability and fitness for a particular purpose and warranties arising from course of dealing or usage or trade CTR 80 User s Manual 77 Return Policy Return Policy If a GE Sensing instrument malfunctions within the warranty period the following procedure must be completed 1 Notify GE Sensing giving full details of the problem and provide the model number and serial number of the instrument If the nature of the problem indicates the need for factory service GE Sensing will issue a RETURN AUTHORIZATION number RA and shipping instructions for

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CTR-80 - GE Measurement & Control