User`s Guide
Contents
1. List of Figures Figure Title Page 1 The 5626 and 5628 Platinum Resistance Thermometers 0 0 2 Standard ceto eed deti d uns 3 2 CM Sa unn 4 2 4 Probe Termination Examples usc nmt 7 1 5626 5628 User s Guide 1 1 Symbols Used Chapter 1 Before You Start Table 1 lists the International Electrical Symbols Some or all of these symbols may be used on the instrument or in this manual Table 1 International Electrical Symbols Symbol Description AC Alternating Current AC DC Ha Battery A M CE Complies with European Union Directives DC Double Insulated Electric Shock Fuse PE Ground Hot Surface Burn Hazard Read the User s Manual Important Information Off On Ca CI 59 Canadian Standards Association OVERVOLTAGE Installation CATEGORY Pollution Degree 2 per IEC1010 1 refers to the level of Impulse Withstand Voltage protection provided Equipment of OVERVOLTAGE CATEGORY is energy consuming equipment to be supplied from the fixed installation Examples include household office and laboratory appliances N10140 C TIC Australian EMC Mark The European Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC mark 5626 5628 User s Guide 1 2 S2. been calibrated a primary calibration laboratory using known intrinsic values 2 3 Calibration In order for any instrument to be used as a standard it must be calibrated The PRTs are calibrated in Hart s Scientific Calibration laboratory and provided with a NIST traceable Report of Calibration At the time of purchase the 5626 and 5628 are calibrated over their entire range 196 C to 660 C at specified ITS 90 fixed points Generally a secondary PRT is calibrated by comparison method All PRTs calibrated by Hart Scientific are calibrated using standard calibration techniques 2 4 Recalibration The recalibration of the 5626 5628 Secondary PRT should be scheduled according to the user s company Quality Assurance requirements Normally a PRT is recalibrated annually Unless the PRT is used only over a limited range calibration over the full range of the PRT 196 C to 661 C is recommended For information on recalibrating your 5626 or 5628 contact Fluke s Customer Service department for an RMA number and current pricing see Section Before You Start Depending on the user s Quality Assurance requirements the PRT drift should be checked periodically at the Triple Point of Water TPW Section 8 Troubleshooting provides information on drift with respect to mechanical shock and oxidation If the Rip cannot be restored after annealing to within calibration tolerances a full recalibration should be scheduled See T
3. calibration tolerance the PRT is usable If the Rip is not within calibration tolerance but it is stable recalibrate the PRT Data unstable If the data is unstable at the Triple Point of Water TPW check the connector If the connector is correct contact an Authorized Scientific Service Center see Section 1 3 The PRT may be damaged and need repair If the data is unstable at high temperatures it may be due to electrical noise in the system Reduce the temperature and observe the data If it is stable electrical noise is interfering with the measurements at high temperatures Check the grounding of the readout device and the heat source A faulty ground on either device could interfere with high temperature measurements A ground wire attached to the metal sheath of the PRT may help to reduce electrical noise interference Temperature readout different than expected e g the heat source is set at 300 C the PRT measures 275 C Measure the PRT resistance at TPW If the resistance of the PRT is less than the rated resistance e g 70 for the 5626 there may be a short in the sensor Contact an Authorized Scientific Service Center see Section 1 3 If the resistance of the PRT is only a few ohms there may be a short in the four lead wires Contact an Authorized Service Center see Section 1 3 If the PRT is open the resistance will be Out of Limits or in the kilo ohm or mega ohm rang
4. Calibration 9626 5628 Platinum Resistance Thermometer User s Guide March 2014 2014 Fluke Corporation All rights reserved Specifications are subject to change without notice All product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international p
5. RANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 To register your product online visit register fluke com Table of Contents Chapter Title Page 1 1 1 1 1 CI IEEE UI 1 1 E EE oO 1 1 1 3 e oo 1 2 1 4 a er 9 211 0 1 1 2 2 Before You Start RAE ELE 2 1 2 1 Symbols 2 1 2 2 Safety 2 2 2 2 1 12 2 2 2 2 GA
6. UTONS 2 2 2 3 Authorized Service Centers 2 3 3 aod iid nti da hie iniecit 3 1 3 2 ITE 3 2 3 3 Electrical 3 2 3 4 Waranty Pm 3 2 4 Installation 4 1 Environmental Issues 4 1 4 2 4 1 4 3 Lead Wire Identification 4 2 5 PRT Care and Handling Guidelines 5 1 5 1 PR SITES DD E m MM 5 1 5 2 PRT Handling Guidelines 5 2 6 Operation 6 1 CIT T 6 1 5626 5628 User s Guide 6 2 Comparison Calibration of Other Instruments 6 4 Thermal Accessories 7 1 Case Options ERR ERO 6 3 Immersion Requirements 7 2 PRT Termination Troubleshooting 8 1 Troubleshooting es c List of Tables Table Title Page 1 International Electrical nter tbe ap 1 1 2 Specifications NR iii 5626 5628 User s Guide
7. able 2 and Figure 2 Chapter 3 Specifications Table 2 Specifications Temperature Range Rip 5626 200 C 1000 1 Q at 0 01 C 5628 to 661 C 25 5 Q 0 5 Q at 0 01 C Resistance RatioW Ga W 302 9146K gt 1 11807 a gt 0 003925 Calibration Uncertainty k 2 0 006 C at 200 C 0 004 C at 0 C 0 009 C at 420 C 0 014 C at 661 C Short Term Stability 0 003 C 0 002 C Long Term Drift Rip lt 0 03 C with 500 hours at 661 C lt 0 02 C with 500 hours at 661 C Sheath Inconel 600 Handle Temperature Range 0 to 80 Lead Wires 4 wire Super Flex PVC 22 AWG Termination Gold plated spade lugs 304 8 mm x 6 35 mm dia 12 L x 0 25 Size 381 mm x 6 35 mm dia 15 L x 0 25 508 mm x 6 35 mm dia 20 L x 0 25 3 1 5626 5628 User s Guide 562X 12 12 gt p mm gt lt 562X 15 15 2 57 562X 20 20 men SCIENTIFIC 5626 8 0021 EN 6 35 mm Inconel Sheath 25 Strain Relief Terminal Box Lead Wire Gold plated Terminals z2 meters 6 N pM Figure 2 Standard Dimensions 3 2 Construction The 5626 and 5628 cover the range from 200 C to 661 C The sensor elements are crafted using high purity platinum wire wound in a strain free design on a specially designed support 3 3 Electrical Circuit The PRT
8. afety Information Use this instrument only as specified in this manual Otherwise the protection provided by the instrument may be impaired 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 1 2 1 Warnings A Warning To avoid personal injury follow these guidelines DO NOT use this instrument to measure the temperature of any hazardous live component DO NOT use this unit for any application other than calibration work DO NOT use this unit in environments other than those listed in the user s manual Use of this instrument at high temperatures for extended periods of time can cause the handle to become hot e Follow all safety guidelines listed in the user s manual e Calibration Equipment should only be used by Trained Personnel 1 22 Cautions A Caution To avoid possible damage to the instrument follow these guidelines DO NOT remove the label from the handle This cautions the user concerning the delicate nature of the instrument NOT drop or bang the probe any way This will cause damage to the probe internally and affect its calibration Read Section 5 entitled PRT Care and Handling Guidelines before removing the PRT from the shipping box or case Incorrect handling can d
9. amage the PRT and void the warranty Keep the shipping container in case it is necessary to ship the PRT Incorrect packaging of the PRT for shipment can cause irreparable damage Before You Start 1 3 Authorized Service Centers 1 3 Authorized Service Centers Please contact one of the following authorized Service Centers to coordinate service on your product Hart Scientific Inc 799 E Utah Valley Drive American Fork UT 84003 9775 USA Phone 1 801 763 1600 Telefax 1 801 763 1010 E mail support hartscientific com Fluke Nederland B V Customer Support Services Science Park Eindhoven 5108 5692 EC Son NETHERLANDS Phone 31 402 675300 Telefax 31 402 675321 E mail ServiceDesk fluke nl Fluke Int l Corporation Service Center Instrimpex Room 2301 Sciteck Tower 22 Jianguomenwai Dajie Chao Yang District Beijing 100004 PRC CHINA 5626 5628 User s Guide Phone 86 10 6 512 3436 Telefax 86 10 6 512 3437 E mail xingye han fluke com cn Fluke South East Asia Pte Ltd Fluke ASEAN Regional Office Service Center 60 Alexandra Terrace 03 16 The Comtech Lobby D 118502 SINGAPORE Phone 65 6799 5588 Telefax 65 6799 5588 E mail antng singa fluke com When contacting these Service Centers for support please have the following information available e Model Number e Serial Number Complete description of the problem Chapter 2 Introduction 2 1 General The 5626 and 5628 Platin
10. contact an Authorized Service Center see Section 1 3 for assistance Be sure to have the model number and serial number of your probe available Problem Data changes greater than 0 1 C are observed Causes and Solutions Mechanical shock can cause temperature errors as great as 0 5 C If this is observed first measure and record the Rip Next anneal the PRT at 660 C overnight Measure the Ry again The annealing should decrease the Rip If the Rip is stable recalibrate the PRT Data changes less than 0 1 C Slight mechanical shock can cause temperature errors less than 0 1 C If this is observed first measure and record the Next anneal the PRT at 660 C overnight Measure the Rip again The annealing should decrease the Rip Repeat the annealing Rip measurement cycle several times When the Rip is stable recalibrate the PRT If the Rip does not stabilize contact an Authorized Scientific Service Center see Section 1 3 Oxidation of the platinum sensor may occur after prolonged use between 200 450 C This oxidation will demonstrate itself by an increase in Rip of less than 0 1 To reduce the effects of oxidation anneal the PRT at 600 661 C overnight 12 hr Measure the Rip again Repeat the annealing measurement cycle 5626 5628 User s Guide several times this annealing process should return Ry to within calibration tolerances If the Rip is within
11. dle or cables to extreme temperatures The temperature limits of the handle are 0 C to 80 C NOT submerge the handle or cable in liquids DO NOT screw a clamp down so tight that it dents the sheath This can permanently damage the PRT 6 1 6 2 6 3 Chapter 6 Operation General For best results be familiar with the operation of the heat source and the read out instrument Be sure to follow the manufacturer s instructions for the read out instrument and the heat source Comparison Calibration of Other Instruments The uniformity and stability of the heat source and the degree of accuracy required determine the number of temperature measurements necessary However to follow good practice procedures always measure the triple point of water Rip after each temperature measurement The following equation provides the most accurate measurement of the ratio R We All PRTs experience errors caused by self heating of the element Self heating is a combination of two factors heat dissipation and heat sink Self heating error can be reduced to have a negligible effect if the PRT is used with the same excitation current and medium in which it was calibrated Immersion Requirements Stem effect can cause measurement errors for any thermometer not immersed in the fluid at least 152 mm 6 inches This error is due to heat lost or gained by the sensing element through the thermometer stem In addition heat
12. e Contact an Authorized Service Center see Section 1 3
13. e four different colors Lead wire pairs attached to each end of the sensor are identified by red and black heat shrink tubing 4 2 5 1 Chapter 5 PRT Care Handling Guidelines PRT Care A Caution Read this section before removing the PRT from the shipping box or case The 5626 and 5628 Platinum Resistance Thermometers PRTs are delicate instruments Care must be taken in handling the PRTs to maintain calibration accuracy The stress free design of the PRT sensor reduces the effects of mechanical shock In addition contamination problems of the sensor at high temperature have been eliminated However care should still be used when handling the PRT even though the Inconel sheath is durable and provides good protection for the sensor Correct handling of the PRT will prolong the life expectancy When not in use the PRT should be stored in the protective case provided Note The PRT sheath changes color after use at high temperatures The PRT may arrive with a brown tint to the sheath due to calibration at high temperatures The handle is not designed to be immersed The temperature limits of the handle are 0 C to 80 C Temperatures outside these limits can damage the sealed portion of the handle and the connectors 5626 5628 User s Guide 5 2 ded Handling Guidelines DO anneal the thermometer after shipment Shipping the thermometer can cause mechanical shocks that affect the accuracy of the thermometer Theref
14. l be little or no thermal EMF effects However if there is a substantial temperature difference between connections the thermal EMF effects will be significant Therefore cover or insulate any exposed bridge or galvanometer terminals to lessen the source of error The effects of thermal EMF can be canceled by using an AC bridge or a DC bridge with reversible current 7 1 7 2 Chapter 7 Accessories Case Options The 5626 5628 PRT comes in a rigid case appropriate for the length of the probe e Model Number 2601 PRT Protective Case for 5626 12 and 5628 12 PRT e Model Number 2609 PRT Protective Case for 5626 15 5628 15 5626 20 and 5628 20 PRT PRT Termination The 5626 5628 PRT can be terminated in three ways Figure 4 depending on the user s requirements e Gold Plated Spade Lug e Bare Wire 5 Pin Din Connector 7 1 5626 5628 User s Guide Spade Lug ET standard y Bare Wire customer option 5 Pin DIN customer option Figure 4 Probe Termination Examples 7 2 8 1 Troubleshooting Chapter 8 Troubleshooting In the event that the probe appears to function abnormally this section may be of use in solving the problem Several possible problem conditions are described along with likely causes and solutions If a problem arises please read this section carefully and attempt to understand and solve the problem If the probe seems faulty or the problem cannot otherwise be solved
15. losses occur due to radiation losses from the sensing element to the housing 5626 5628 User s Guide 6 2 6 4 The immersion depth for standards is dependent on several factors including accuracy requirements and type of liquid Therefore we recommend a 152 mm 6 inches minimum immersion depth However remember the handle limitations The handle is not designed to be immersed The temperature limits of the handle are 0 C to 80 C Temperatures outside these limits can damage the handle Convection of heat from the heat source must be kept within the handle limits The exact immersion depth required can be determined by performing a gradient test taking measurements approximately every 1 27 cm 5 inches until there is a significant difference in readings Allow the thermometer to stabilize at each new depth Plot the results to see the stem effect Thermal EMF Two factors contribute to thermal EMF chemical consistency and physical consistency Variations in chemical structure due to impurities can contribute to thermal EMF Also discrepancies in crystal structure can contribute to thermal EMF These factors are minimized by annealing the full length of wire before construction of the PRT Likewise connection to extension lead wires and readout instruments can be a source of thermal EMF The thermal EMF is caused by a difference in temperature between two connections If the two connections are the same temperature there wil
16. ore if possible we advise that the thermometer be annealed before use The thermometer should be annealed at 500 overnight or 660 C for four 4 hours DO keep the thermometer as clean as possible Always remove any fluid from the sheath immediately after taking the thermometer from a bath DO immerse the thermometer in the appropriate liquid for the temperature range If a dry block is used the well diameter should allow the PRT to comfortably slip in and out without excess movement For best results immerse the thermometer as deep as possible to avoid stem effect the temperature error caused by the conduction of heat away from the sensor Do not submerge the handles e DO allow sufficient time for the thermometer to stabilize before making measurements This allows for the best accuracy DO use the correct drive current with the thermometer to prevent error in temperature or resistance Fluke recommends 1mA DO anneal the thermometer at 600 to 661 C for 12 hours if it becomes oxidized DO use the protective shipping box or case provided or other protection when the thermometer is not in use e DO NOT subject the thermometer to any physical shock or vibration DONOT use pliers or other devices to squeeze the sheath This action can permanently damage the PRT NOT subject the thermometer to temperatures above the highest specified operating temperature DONOT expose the thermometer s han
17. rice Fluke reserves the right to invoice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WAR
18. s are provided with a terminal box handle The two meter cable has four Super Flex wires enclosed in a PVC jacket with a stainless steel spring strain relief Gold plated spade lugs terminate the wires 3 2 4 1 4 2 4 Installation Environmental Issues Ideally temperature calibration equipment should be used in a calibration laboratory or other facility specifically designed for this purpose Environmental requirements include e Stable temperature and relative humidity lt 80 e Clean draft free area e Low noise level low radio frequency magnetic or electrical interference low vibration levels Mounting Most often temperature standards primary and secondary are used to calibrate other temperature sensitive equipment The PRT must be mounted carefully to avoid any damage to the sheath or sensor If the fluid bath used does not have a lid designed for PRT insertion clamps should be used to ensure the handle and cable are not immersed Do not screw the clamps too tight Over tightening will damage the sheath If metal comparison blocks are used in the bath maintain a close fit between the thermometer sheath and the well in the comparison block However allow for the thermal expansion of the thermometer sheath when determining block well tolerances 5626 5628 User s Guide 43 Lead Wire Identification RED Heat Shrink BLACK Heat Shrink Figure 3 PRT Schematic The lead wires ar
19. um Resistance Thermometers PRT models are designed to be the best secondary standard interpolating instrument converting temperature to resistance The PRTs are used with a readout device to detect temperature changes or actual temperature The PRTs cover the International Temperature Scale of 1990 ITS 90 range from 200 C to 661 C Two standard resistance values are available The 5626 is 100 Q and the 5628 is 25 5 Q Standard lengths are 12 15 and 20 inches Custom lengths are available on request The two PRTs are hand constructed by experts with years of PRT manufacturing experience Each PRT is carefully annealed at the appropriate temperatures and precisely tested for stability The sensing element is fabricated using high purity platinum wire wound in a strain free design on a specially designed support The 1 4 inch O D Inconel 600 sheaths are sealed with a specially mixed gas and fit with a terminal box handle and strain relieved connection to the four wire cable Gold plated spade lugs terminate the wires 2 2 Application The 5626 and 5628 thermometers are classified as secondary standards A secondary standard is defined in terms of transfer of the ITS 90 from a standards laboratory to a customer s laboratory Secondary standards are 5626 5628 User s Guide C ERIS EE gt TE 3e xs Figure 1 5626 5628 Platinum Resistance Thermometers calibrated using a primary standard that has
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