OPERATING INSTRUCTIONS AND SYSTEM DESCRIPTION FOR
Contents
1. 0 100 200 300 400 500 600 700 800 900 1000 time s Figure 5 Time course of temperature regulation of the 20 channel A 1 LIMITER was set to 100 GAIN was set to the seventh scale mark 2 GAIN was set to the eighth scale mark 3 INTEGRATION was turned on at a low level version 3 8 page 17 PTC 20 User Manual 6 1 20 and the HCMIS Micro Incubator Connection Connect the HCMIS using the ALA DIN cable to one of the SENSOR connectors 28 or 25 Figure 1 The right polarity 16 ensured automatically Operation Heating Follow the steps as described above With the HCMIS micro incubator from ALA Scientific Instr it is likely that you have to use more gain in order to reach a steady state temperature of 35 C to 36 C without INTEGRATION In that case increase the gain stepwise and wait in every step until the temperature reaches a steady state level of 35 to 36 then turn on the INTEGRATION as described above see also Figure 6 Cooling It is characteristic for Peltier elements that when they cool on one side the other side gets very hot When cooling the upper side of the HCMIS gets hot and it must be ensured that the heat from the upper side 15 carried off This 1s best done by using the fluid cooling system of the HCMIS Without cooling the HCMIS with fluid it is not possible to reach temperatures below 20 Caution When operating the HCMIS in cooling mode always u2. D Electronic Instruments for the Life Sciences Sa made OPERATING INSTRUCTIONS AND SYSTEM DESCRIPTION FOR THE PTC 20 PELTIER TEMPERATURE CONTROL SYSTEM VERSION 3 8 npi 2014 npi electronic GmbH Bauhofring 16 D 71732 Tamm Germany Phone 49 0 7141 9730230 Fax 49 0 7141 9730240 support npielectronic com http www npielectronic com PTC 20 User Manual Table of Contents l S UAL ONS ees E 3 2 CODIDOHE DES voici secos tete ed dista 4 SNB IRSE rd 4 Sols System DOSCEIDUOR s rone estote Fat o Iu ous Unt bei oes ub oen 4 3 2 Descrip onor the Front dede dee UR 2 95 RE Panci opi ee eM Ea Ioco 10 3 4 Electronic Control and Protection oae oe Pre enean 10 2 5 Connection or 2 11 3 0 Modes OF UM OMA ESL EO LO 11 setine the DESIRED TEMPERA TURE 13 NE M NE M ML UM E 13 5 Connection of the Sensor DIN Connector Block diagram sssss 14 60 Operating guide Tuning procedure eno inanimate T
3. 29 or 24 Figure 1 The COMMAND INPUT is scaled 10mV C 1 370 mV at this connector would set the DESIRED TEMPERATURE to 37 C Important set value of the temperature is always the sum of the setting at DESIRED TEMP C potentiometer and the voltage at COMMAND INPUT 10mV connector i e if DESIRED TEMP C is set to 25 0 C and the voltage at COMMAND INPUT 10mV 1s 150 mV the temperature will be set to 40 C 4 Grounding To avoid ground loops the internal ground of the system 15 floating 1 1 15 not connected to the protective earth of the mains while the cabinet 1s always connected to protective earth green yellow wire The system can be grounded either via a BNC cable connected to INPUT or OUTPUT 10 mV C or via the blue OUTPUT GND connector version 3 8 page 13 PTC 20 User Manual 5 Connection of the Sensor DIN Connector Block diagram Cable of temperature sensor TOP PIC FINIS ie length 2m red yellow heat shrink tube 20mm heat shrink tube 15mm i Can Imm jack 4 40mm shield blue white sensor 4 Imm gold pin Eie 8 pole plug shield Pin 2 blue white Pin 1 red yellow Figure 2 How to connect the temperature sensor version 3 8 page 14 PTC 20 User Manual SENS IN Power Power nc nc SENS IN nc SENS IN 3 4 B Bu T 8 1 Figure 3 Connector pinout
4. HEAT COOL LEDs LEDs that indicate the state of the POWER OUTPUT 32 33 or 20 21 of channel A or channel B HEAT yellow LED output polarity positive side will be heated see also chapter 3 5 COOL green LED output polarity negative side will be cooled see also chapter 3 5 version 3 8 page 6 PTC 20 User Manual Potentiometer logarithmic scale to change the GAIN parameter amplification of the error signal see chapter 3 4 of the temperature controller PI controller of channel A or B range 10 to 6 15 INTEGRATION potentiometer Potentiometer to set the INTEGRATION parameter time constant of the temperature controller PI controller of channel A or B time range 50 ms 20 s Digital display that shows the temperature determined by SENSOR A or SENSOR B resolution XX X The mode of operation unit of channel consists of 8 MODE switch 9 ALARM LED 10 EXT SENSOR connector 28 SENSOR connector 29 COMMAND INPUT 10mV C connector and 30 DESIRED TEMP C potentiometer 8 MODE switch Switch to select the operation modes for channel A Four modes are available SENSOR A the temperature determined by SENSOR A 28 is used for the control system DIRECT HEAT the voltage at the POWER OUTPUT 32 33 can be set directly from the DESIRED TEMPERATURE potentiometer 30 0 to 12 V no control DIRECT COOL the voltage
5. 30 m n ot ra 32 31 BIPOLAR POWER OUTPUT 3A EAI ONLY HEA e ale 100 10 HEAT ON uz E orn 9 b q OFF ul n T NIEGRATC 34 Figure 1 PTC 20 front panel view version 3 8 page 5 PTC 20 User Manual In the following description of the front panel elements each element has a number that 1s related to that in Figure 1 The number is followed by the name in uppercase letters written on the front panel and the type of the element in lowercase letters Then a short description of the element is given Some elements are grouped in functional units e g MODE of operation unit and are described as units regardless of the order of numbers PTC 20 has two temperature control channels with identical operation elements for channel A and channel B respectively Thus in the following description the elements are addressed first for channel A bold and second for channel B bold italic underlined Only the mode of operation unit is described separately for each channel 1 POWER pressure switch The HEAT ONLY toggle switch sets the controller into HEAT ONLY mode 2 for channel A 19 for channel B The red LED above the switch indicates the state of the controller LED on HEAT ONLY 3 18 LIMITER potentiometer Potentiometer to set the voltage range of the POWER OUTPUT 32 33 or 20 21 of channel or channel B 10096 12 Volt 4 17
6. ALWAYS ON APPROPRIATE HEAT SINKS TO AVOID DAMAGE THROUGH OVERHEATING version 3 8 page 3 PTC 20 User Manual 2 PTC 20 Components The following items are shipped with the PTC 20 system X PTC 20 controller X Power cord 4X User manual Optional accessories Miniature temperature sensor Subminiature temperature sensor Caution The temperature sensors are very sensitive to mechanical stress especially to bending Therefore they must be handled with great care to avoid breaking of the insulation PT 100 temperature sensor HCMIS microincubator H MIC20 heat only micro incubator Recording chamber Heated perfusion tube Thermal foil Objective heater L do bee ode eus cb 3 PTC 20 System 3 1 System Description PTC 20 temperature control system 15 designed for heating and cooling purposes in electrophysiological experiments The PTC 20 system provides two independent temperature controller channels and is housed in a 19 inch standard rackmount cabinet with built in power supply and cooling elements for the power devices The PTC 20 system guarantees low noise operation and has special protection features to prevent the preparation from damage The PTC 20 incorporates two channels which include an electronic thermometer for small semiconductor sensor standard 15 R2252 1 e the sensor has a resistance of 2252 at 25 C or optionally PT 100 1 100 at 0 a digital temperature display XX X C for
7. ION The selector for the line voltage and the connector for the power cord are located in a mains connection module on the rear panel of the instrument Caution operated with other line voltage the instrument may be damaged if the wrong line fuse 15 installed FUSE The fuse 1s also integrated 1n the mains connection module The line fuse must be 4 A slow 115 V or 2 A slow 230 V It must be replaced only by specified type see above Please disconnect mains power plug before replacing fuse 3 4 Electronic Control and Protection Circuits CONTROL LOOP The sensor thermometer PI controller output power stage and Peltier element form a closed loop control system The desired temperature signal 15 compared with the output signal obtained from the thermometer giving an error signal This signal is amplified in the PI controller and transferred to the output stage where it 1s converted to a high power output signal applied to the Peltier element ELECTRONIC PROTECTION CIRCUITS Each system 1s equipped with two protection systems 1 Sensor inputs an electronic shut off function disconnects the output if the sensor is disconnected broken or short circuited 2 Output protection the output current and voltage are limited electronically Important sensors used for the control must be good thermal connection with the Peltier elements 1f not unstable operation and damage may occur version 3 8 page 10 PTC 20 User
8. If this value is not reached set the GAIN to higher levels until in this example 35 C to 35 5 C is reached e If the desired temperature is not reached first set the GAIN to a slightly higher level and then if necessary raise the INTEGRATION see Figure 5 Note The speed of the control circuit and therefore the time in which the actual temperature reaches the DESIRED TEMPERATURE is highly dependent on the first settings of GAIN and INTEGRATION Thus when beginning to use the PTC 20 we recommend to try out several first settings of GAIN and INTEGRATION to find out which settings are best for your experimental conditions If you use a perfusion system and you are going to heat it 15 recommended to heat the solution approximately to the desired temperature before perfusing the bath either with a heated perfusion tube 2 available from npi or by heating up the supplying bowl As mentioned above it is very important that the sensor element and the heating cooling element are in good thermal connection In Figure 5 the time course of temperature regulation of the PTC 20 channel A 1s shown As resistive load a bulb 12V 21W was used The temperature sensor was fixed directly on the bulb and sensor and bulb were wrapped with foam Starting temperature was 27 3 Starting conditions were LIMITER set to 0 GAIN set to 0 INTEGRATION off temperature 39 37 35 33 91 29 EL 25
9. M circuit see below is disabled in this mode Note In DIRECT COOL mode there will not occur any output voltage when the HEAT ONLY toggle switch is activated DIRECT HEAT and DIRECT COOL will work in this way only if the Peltier element is connected to the PTC 20 with right polarity HEATING COOLING OPERATION in DIRECT mode The PTC system is designed with bipolar outputs 0 V to 12 V DC If a resistive load is connected the system can be used for heating purposes in all modes CONTROL and DIRECT If a PELTIER device is connected to the output the system can be used either for heating or cooling purposes active side of the Peltier device in contact with recording chamber If a Peltier device is used for cooling purposes the opposite hot side of the Peltier element must be connected to an adequate heat sink Caution When using COOL DIRECT mode check the position of the HEAT ONLY toggle switch position is also indicated by the red HEAT ONLY LED In any case cooling function is only possible when this switch is not activated Internal SENSOR mode In this mode the output voltage is controlled by the PI controller PI proportional integral controller system activated The temperature signal which is used for the control unit is SENSOR A for channel A and SENSOR B for channel B The temperature is measured with a small semiconductor or PT100 sensor connected to SENSOR A and or to SENSOR B and displayed at the respective di
10. Manual ALARM circuit The internal thermometer R2252 or 100 sensor inputs are protected by the sensor alarm circuit see above If this thermometer 15 used as input device for the PI controller the ALARM circuit disconnects the power output if the sensor is damaged or not connected This state 15 indicated by the red ALARM LED If the DIRECT mode or EXT mode is used the ALARM circuit is disabled ACCURACY Measuring accuracy of the internal thermometer is 0 1 C controller accuracy is 0 5 C or better depending on the amount of heated solution 3 5 Connection of Peltier Elements The PTC 20 15 designed to work with Peltier elements Peltier elements have two different sides one is the active side and the other is the opposite side usually marked as active and opposite respectively In order to work properly the Peltier elements have to be connected with right polarity to the PTC 20 Quick installation for channel A 1 Connect the active side to the pole 33 Figure 1 1 Connect the opposite side to the pole 32 Figure 1 Mount the Peltier element on a heat sink the opposite side facing the heat sink This 1s very important especially if you use the Peltier element for cooling because in cooling mode the opposite side gets hot or L Connect a Peltier element using an ALA DIN cable to the SENSOR connector 28 Figure 1 The right polarity is ensured automatically Now
11. at the POWER OUTPUT 32 33 can be set directly from the DESIRED TEMPERATURE potentiometer 30 0 to 12 V no control EXT SENSOR an external thermometer connected to BNC connector 10 sensitivity ImV C be used for the controller loop version 3 8 page 7 PTC 20 User Manual 9 ALARM LED LED that indicates that the temperature SENSOR is not connected broken or short circuited The POWER OUTPUT 32 33 shuts down if this LED is on and the MODE switch 8 1s set to SENSOR A 10 EXT SENSOR C connector BNC connector for an external thermometer with a voltage output of ImV C 28 SENSOR A connector 8 pole connector for temperature SENSOR This connector also provides the POWER OUTPUT 32 33 for the heating unit max 12V DC and for devices with the ALA DIN connector cable assembly e g HCMIS see www alascience com 29 COMMAND INPUT 10mV C connector BNC connector to set the working temperature of the controller system by an external voltage signal This input is scaled with the factor 10mV C 30 DESIRED TEMP C potentiometer Digital potentiometer to set the working temperature of the controller system for channel A range 02 0 C to 60 0 C XX X C or 0 100 of output voltage DIRECT mode 11 Protective earth 27 GROUND connectors To avoid ground loops the internal ground of the system is floating 1 it is not connected to the protective earth of the lin
12. depending on which sensor is used as feedback temperature in the controller loop e set the DESIRED TEMPERATURE to e g 37 C DESIRED 3 7 O turn on the instrument and wait at least 15 minutes to warm up the instrument The temperature display should show the actual temperature at the sensor e turn the LIMITER to 100 Note you use heating wires with 6V operating voltage turn the LIMITER to 50 to protect the wire from damage If the difference between the actual and the desired temperature is more than 10 C the HEAT LED will light up slightly e turn the GAIN to the seventh scale mark GAIN The actual temperature at the sensor now approaches the desired temperature but will not reach 37 because the control loop 15 not yet well adjusted The actual temperature will arrest at 1 to 2 below the desired temperature Please wait until this steady state value 1s reached This may last several minutes If you don t get a steady state value set the LIMITER to 80 90 or 30 40 respectively and wait again version 3 8 page 16 PTC 20 User Manual e Now turn on the INTEGRATION and set it approximately to the first scale mark You will hear a Click if the INTEGRATION gets active OFF MAX INTEGRATION The actual temperature at the sensor will now reach the desired temperature possibly after a small overshoot Wait again until the steady state value is reached
13. e cable while the cabinet is always connected via the power supply cable green yellow wire The system can be grounded by connecting plug 11 protective earth or 27 internal ground MODE of operation unit channel B The mode of operation unit of channel B consists of 12 MODE switch 13 ALARM LED 26 EXT SENSOR C connector 25 SENSOR B connector 24 COMMAND INPUT 10mV C connector and 23 DESIRED TEMP C potentiometer version 3 8 page 8 PTC 20 User Manual 12 MODE switch Switch to select the operation modes for channel B Four modes are available SENSOR B the temperature determined by SENSOR B 25 is used for the control system DIRECT HEAT the voltage at the POWER OUTPUT 20 21 can be set directly from the DESIRED TEMPERATURE potentiometer 23 0 to 12 V no control DIRECT COOL the voltage at the POWER OUTPUT 20 21 can be set directly from the DESIRED TEMPERATURE potentiometer 23 0 to 12 V no control EXT SENSOR an external thermometer connected to BNC connector 26 sensitivity ImV C can be used for the controller loop 13 ALARM LED LED that indicates that the temperature SENSOR B 25 is not connected broken or short circuited The POWER OUTPUT 20 21 shuts down if this LED is on and the MODE switch 12 1s set to SENSOR B 26 EXT SENSOR C connector BNC connector for an external thermometer with a voltage output of 1mV C 25 SENSOR B c
14. each channel set value control with direct readout XX X a PI proportional integral controller with adjustable parameters an output power control unit and a high power bipolar output stage 12 V DC continuous operation for Peltier elements 1 e heat cool operation or resistive 1 e heat only loads with electronic protection circuits For heat only applications the bipolar output can be switched to unipolar operation 12V The power outputs are short circuit protected the output power is limited electronically Maximum output voltage is approximately 12 Volt the current is limited to 3 A The system can be connected to the thermistors heating Peltier elements in two ways Using separate cables for the sensors and the heating element or Using the ALA DIN cable assembly that connects both sensors and heating Peltier elements A large variety of sensors and thermal elements are available see also Optional accessories in chapter 2 Please contact npi for details Important Peltier elements must be mounted always on appropriate heat sinks to avoid damage because of overheating version 3 8 page 4 PTC 20 User Manual 19 20 18 L3 527 HEAT ONLY PT ON 16 CUIPUT 8 TO rmv f 17 BPOLAR POER OUTPUT E 15 22 p 4 5 c T 2 z SE CN d i i CN 8 E x CX C e m i 2l o E CN 5 LU
15. een du 16 6 1 PTC 20 and the HC MIS MICEO ICUDATOR acini eut tape 18 CONNECCION m E 18 18 6 2 Operation with HPT 2A Heated Perfusion 19 Je ETI ace ese yao 19 Bener BL 5 20 version 3 8 2 PTC 20 User Manual 1 Safety Regulations VERY IMPORTANT Instruments and components supplied by npi electronic are NOT intended for clinical use or medical purposes e g for diagnosis or treatment of humans or for any other life supporting system npi electronic disclaims any warranties for such purpose Equipment supplied by npi electronic must be operated only by selected trained and adequately instructed personnel For details please consult the GENERAL TERMS OF DELIVERY AND CONDITIONS OF BUSINESS of npi electronic D 71732 Tamm Germany 1 GENERAL This system 15 designed for use in scientific laboratories must be operated by trained staff only General safety regulations for operating electrical devices should be followed 2 ACMAINS CONNECTION While working with the npi systems always adhere to the appropriate safety measures for handling electronic devices Before using any device please read manuals and in
16. gital display unit 7 or 14 Figure 1 XX X If no sensor is connected or if the sensor is damaged or short circuited the internal shut off unit disconnects the power output This state is indicated by the red ALARM LED 9 or 13 Figure 1 located just above the MODE switch Caution The temperature sensors are very sensitive to mechanical stress especially to bending Therefore they must be handled with great care to avoid breaking of the insulation EXT SENSOR mode This mode can be used to connect an external thermometer The calibration of the external input EXT SENSOR ImV C 10 or 26 Figure 1 is 1 mV C If this option is used the internal ALARM circuits are disabled POWER OUTPUT is always available at POWER OUTPUT and SENSOR A or SENSOR B respectively Figure 4 gives an overview of the operation modes of the PTC 20 version 3 8 page 12 PTC 20 User Manual Setting the DESIRED TEMPERATURE There are two ways to set the DESIRED TEMPERATURE 1 The easiest way 15 to use the digital potentiometer DESIRED TEMP The temperature can be set from 03 0 C to 60 0 C resolution 0 1 C If the PTC 20 leaves this temperature window the internal shut off unit disconnects the power output This could be the case 1f the sensor 15 broken or short circuited 2 the user wants to have external control e g with a computer system the DESIRED TEMPERATURE can be set using the COMMAND INPUT 10mV C connector
17. it is ensured that the active side gets hot if the MODE switch 8 Figure 1 is set to HEAT and cold if the MODE switch Figure 1 is set to COOL in DIRECT mode The right polarity is also very important for all other operation modes see chapter 3 6 Note The POWER OUTPUT line of the SENSOR connectors 15 always operating for the channel which 15 selected regardless of the MODE OF OPERATION see chapter 3 6 3 6 Modes of Operation Each channel of the system can be used in the following modes of operation DIRECT MODE output voltage is set directly by the DESIRED TEMP C control Internal SENSOR mode output voltage 1s controlled by the PI controller using SENSOR A or SENSOR B EXT SENSOR mode output voltage is controlled by the PI controller using an external thermometer version 3 8 page 11 PTC 20 User Manual DIRECT mode In DIRECT mode no temperature control the MODE switch 8 channel A or 72 channel B Figure 1 1s set to one of the two DIRECT positions DIRECT HEAT position sets the output voltage positive referring to ground DIRECT COOL position sets the output voltage negative referring to ground In both DIRECT modes the control unit is not active i e the output voltage is preset directly at the DESIRED TEMP control 30 channel A or 23 channel B Figure 1 With the setting from 000 to 999 the output voltage increases linearly from V to 12 V DIRECT HEAT or 0 V to 12 V DIRECT COOL The ALAR
18. of the DIN connector pins 1 and 3 are connected internally 1N3 313 3139 1 JGOW 12314 uOSN3S 1X3 HALS e3 NOd Havin HT EN DONESE 0301530 Lj SUNOCO oo NIVO 2 IKAWO O Junya 0301630 T3NNVHO 1Od INOO sdnlvdadWal JNO Figure 4 Block diagram of the PTC 20 page 15 version 3 8 PTC 20 User Manual 6 Operating guide Tuning procedure After unpacking the instrument please check the appropriate voltage at the voltage selector at the back panel Also check that the sensor used for the control is in good thermal connection with the heating wire or the active side of the Peltier element and that the Peltier element is connected with right polarity see chapter 3 5 Important Make sure that the SENSOR or the external SENSOR respectively and the heating device Peltier element that 1s controlled by this SENSOR are using the same channel Otherwise the heating device Peltier element may be damaged due to overheating In the following it is assumed that you use devices delivered by npi or ALA Scientific Instr with 12V operating voltage Please follow these instructions step by step to avoid problems in adjusting the instrument e Turn all potentiometers to the most left position e switch the MODE selector to the position SENSOR A or B
19. onnector 8 pole connector for temperature SENSOR B This connector also provides the POWER OUTPUT 20 21 for the heating unit max 12V DC and for devices with the ALA DIN connector cable assembly e g HCMIS see www alascience com 24 COMMAND INPUT 10mV C connector BNC connector to set the working temperature of the controller system by an external voltage signal This input is scaled with the factor 1OmV C 23 DESIRED TEMP C potentiometer Digital potentiometer to set the working temperature of the controller system for channel B range 05 0 C to 60 0 C XX X C or 0 100 of output voltage DIRECT mode 32 33 20 21 BIPOLAR POWER OUTPUT MAX 3A connectors Banana jack connectors for the heating units 32 33 for channel A 20 21 for channel B These outputs supply a maximum voltage of 12V DC and a maximum current of 3 A POWER OUTPUT is also available at the SENSOR A 28 and SENSOR B connectors 25 for devices with the ALA DIN cable assembly version 3 8 page 9 PTC 20 User Manual 31 22 OUTPUT 10mV connector BNC connector monitoring the temperature determined by SENSOR A 28 or SENSOR B 25 respectively sensitivity 10mV C 34 SHUTOFF TEMPERATURE label Label indicating the upper SHUTOFF TEMPERATURE standard is 60 C If the sensor measures the indicated temperature or more the POWER OUTPUT is disabled 3 3 Rear Panel Elements LINE VOLTAGE SELECT
20. se the fluid cooling system to avoid overheating and damage of the Peltier elements PTC 20 with HCMIS effects of several gain positions and integrator 40 38 36 34 gaing Mtegrator gain8 9 32 2 gain7 5 ain6 5 30 9 o gain5 ain4 5 28 9 26 24 4 22 gain3 20 T T T T T 0 500 1000 1500 2000 2500 3000 time s e temperature channel A Figure 6 Time course of temperature regulation of the PTC 20 HCMIS micro incubator connected to channel A version 3 8 page 18 PTC 20 User Manual 6 2 Operation with HPT 2A Heated Perfusion Tube For use with HPT 2A from ALA please follow these hints 1 Always use the LIMITER Do not set the LIMITER to more than 40 for a longer time since the HPT 2A will melt if operated at more than 5V If in doubt measure the output voltage using a voltmeter 1 Do not heat the HPT 2A without flow of solution See also HPT 2A manual T Literature Kettenmann and Grantyn eds Practical Electrophysiological Methods Wiley Liss New York 1992 Froehr and Orttenburger Introduction to Electronic Control Engineering Siemens AG Berlin and Munich 1982 version 3 8 page 19 8 Technical Data Sensor input sensor input EXT Mode ALARM and SHUTOFF Digital displays COMMAND INPUT Set value control Temperature OUTPUT A B Power output Limiter Control Mea
21. structions carefully The device is to be operated only at 115 230 Volt 60 50 Hz AC Please check for appropriate line voltage before connecting any system to mains Always use a three wire line cord and a mains power plug with a protection contact connected to ground protective earth Before opening the cabinet unplug the instrument Unplug the instrument when replacing the fuse or changing line voltage Replace fuse only with an appropriate specified type 3 STATIC ELECTRICITY Electronic equipment 15 sensitive to static discharges Some devices such as sensor inputs are equipped with very sensitive FET amplifiers which can be damaged by electrostatic charge and must therefore be handled with care Electrostatic discharge can be avoided by touching a grounded metal surface when changing or adjusting sensors Always turn power off when adding or removing modules connecting or disconnecting sensors headstages or other components from the instrument or 19 cabinet 4 TEMPERATURE DRIFT WARM UP TIME analog electronic systems sensitive to temperature changes Therefore all electronic instruments containing analog circuits should be used only in a warmed up condition 1 e after internal temperature has reached steady state values most cases warm up period of 20 30 minutes 15 sufficient 5 HANDLING Please protect the device from moisture heat radiation and corrosive chemicals PELTIER ELEMENTS MUST BE MOUNTED
22. suring accuracy Power requirements Dimensions version 3 8 PTC 20 User Manual for semiconductor 2252 Q at 25 C standard or platinum 100 Q at C accuracy typically 0 1 C at 25 C with electronic protection ImV C disconnects POWER OUTPUT if temperature is below 3 C not connected or broken sensor or above 60 C short circuited sensor other ranges possible 3 1 2 digits XX X C temperature of SENSOR A or B or XX X V voltage at power output analog input 1OmV C via BNC connector digital control range 03 0 C to 60 0 C other ranges possible XX X C or 0 100 of output voltage DIRECT modes analog outputs 10mV C via BNC connector output impedance 250 12 V 3 A for each channel short circuit protected continuous DC control for the output voltage with a linear range from 0 100 PI proportional integral controller accuracy typically 0 2 C gain range 10 10k integration time 50 ms 20 s logarithmic scale 0 1 C at 25 C 115 230V AC 60 50 Hz fuse 4 2A slow 19 rackmount cabinet 19 483 mm 10 250 mm 3 5 88 mm page 20
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