PTC-10 - NPI Electronic Instruments
Contents
1. 18 6 2 Operation with HPT 2A heated perfusion 19 Je EAU UU acta p D 19 Bener 20 version 3 8 page 2 10 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 2 3 4 5 GENERAL This system is designed for use in scientific laboratories and must be operated by trained staff only General safety regulations for operating electrical devices should be followed AC MAINS 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 instructions 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 g2. Digital potentiometer to set the working temperature of the controller system range 02 0 C to 60 0 C XX X C or 0 100 of output voltage DIRECT mode Display A unit TEMPERATURE The Display A unit consists of 3 TEMPERATURE C A display and 20 SENSOR A POWER OUT switch A POWER Out 3 TEMPERATURE C A display Digital displayshowing the temperature determined by SENSOR A 18 or the voltage at the POWER OUTPUT connectors 13 14 Switch 20 is used to select one of these functions of display A 20 SENSOR A POWER OUT switch display mode switch Switch to select the mode of display A 3 SENSOR A upper position the temperature determined by SENSOR A 18 is displayed XX X C PWR OUT lower position the voltage at the POWER OUTPUT 13 14 is displayed 4 ALARM LED LED indicating that temperature SENSOR A 18 is not connected broken or short circuited or that the measured temperature goes beyond the shutoff temperature see also 24 The POWER OUTPUT 13 14 shuts down if this LED is on and the MODE switch 5 1s set to SENSOR A version 3 8 page 6 PTC 10 User Manual ENI CTI A V rrw i C 5 MODE switch The MODE of operation unit of channel consists of 5 MODE switch 17 EXT SENSOR 1mvV C connector 18 SENSOR A connector 16 SENSOR B connector SENSOR B Switch to select the operation modes of the
3. 1 SENS IN 2 SENS IN 3 SENS IN 4 nc 9 nc 6 T Power 8 Power Figure 3 Connector pinout of the DIN connector pins 1 and 3 are connected internally a F ui E ge E oH 5 5 c c 9 am e x LLI C 4D Q 5 gt E I 2 54 Cc a gt amp Bm E 2 DB a rd 58 Lik iD E E 5 5 5 amp E ME z 2 ci 7 5 m ea amp tra e Figure 4 Block diagram of the PTC 10 version 3 8 page 15 PTC 10 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 is 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 t
4. 1 Connect the opposite side to the pole 14 Figure 1 I 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 this mode the opposite side gets hot or I Connect a Peltier element using an ALA DIN cable to one of the SENSOR connectors 16 18 Figure 1 The right polarity is ensured automatically Now it is ensured that the active side gets hot if the MODE switch 5 Figure 1 1s set to HEAT and cold if the MODE switch 5 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 lines of the SENSOR connectors are always connected regardless of the MODE OF OPERATION see chapter 3 6 3 6 Modes of Operation 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 is 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 DIRECT Mode In DIRECT mode no temperature control the MODE switch 5 Figure 1 is switched to one of the two possible DIRECT positions DIRECT HEAT position sets the output voltage positive referring to ground DIRECT COOL position sets the output voltage n
5. PTC 10 User Manual 13 14 POWER OUTPUT Max 5A connectors Banana jack connectors for the Peltier element Red jack 13 supplies positive voltage for heating and negative voltage for cooling The active side of the Peltier element is connected here see also chapter 3 5 This output supplies a maximum voltage of 15 DC and a maximum current of 5A Blue jack 14 is connected to internal ground see also 22 The opposite side of the Peltier element is connected here see also chapter 3 5 POWER OUTPUT is also available at the SENSOR A 18 and SENSOR B connectors 16 for devices with the ALA DIN cable assembly Note It is not recommended to use jack 14 for grounding purposes Use instead GROUND PROTECTIVE EARTH connectors 22 or 23 to ground your system 15 OUTPUT B 10mV C connector BNC connector monitoring the temperature determined by SENSOR B 16 sensitivity 10mV B IO mW I C 19 OUTPUT A 10mV C connector BNC connector monitoring the temperature determined by SENSOR A 18 sensitivity 10mV C OUTPUT 21 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 22 GROUND 23 Protective earth connectors To avoid ground loops the internal ground of the system is floating 1 e it is not connected to t
6. PTC 10 Five modes are available SENSOR A DIRECT HEAT DIRECT COOL the temperature determined by SENSOR 1 is used for the control system This connector also provides the POWER OUTPUT 13 14 for the heating unit Peltier element max 15V DC and 5A for devices with the ALA DIN connector cable assembly e g HCMIS see www alascience com the voltage at the POWER OUTPUT 13 14 can be set directly from the DESIRED TEMP potentiometer 2 0 15 V no control Works correct only if the Peltier element is connected with right polarity see chapter 3 5 the voltage at the POWER OUTPUT 13 14 can be set directly from the DESIRED TEMP potentiometer 2 0 15 V no control Works correct only if the Peltier element is connected with right polarity see chapter 3 5 EXT SENSOR EXTERN SENSOR an external thermometer connected to BNC 17 SENSOR B sensitivity ImV C is used for the controller loop temperature determined by SENSOR B 16 is used as feedback temperature in the controller loop This connector also provides the POWER OUTPUT 13 14 for the heating unit Peltier element max 15 DC and 5A for devices with the ALA DIN connector cable assembly e g HCMIS see www alascience com 17 EXT SENSOR ImV C connector BNC connector to also 5 connect external thermometer with a voltage output of 1mV C see 18 SENSOR connector 8 pole connector for temperature SENSO
7. is controlled by the PI controller PI proportional integral controller system activated The SENSOR position selects the internal thermometer which use a small semiconductor or PT100 sensor The measured temperature is displayed at the respective digital display unit 3 or 7 Figure 1 The selected SENSOR input A or is connected to the controller and output Stage If no sensor is connected or if the sensor is damaged or short circuited or the measured temperature goes beyond the shutoff temperature see also 24 Figure 1 the internal shut off unit disconnects the corresponding power output This state 15 indicated by the red ALARM LED 4 or 6 Figure 1 EXT SENSOR mode This mode can be used to connect an external thermometer The calibration of the external input BNC 17 Figure 1 is 1 mV C If this option is used the internal ALARM circuit is disabled Note The ALARM circuit see below is disabled in this mode Figure 4 gives an overview of the operation modes of the PTC 10 version 3 8 page 12 10 User Manual 3 7 Setting the DESIRED TEMPERATURE There are two ways to set the DESIRED TEMPERATURE 1 The easiest way is to use the digital potentiometer DESIRED TEMP C The temperature can be set from 03 0 C to 60 0 C resolution 0 1 C If the PTC 10 leaves this temperature window the internal shut off unit disconnects the power output This could also be the case if the sensor is broken or sh
8. R A 16 SENSOR B connector 8 pole connector for temperature SENSOR version 3 8 page 7 PTC 10 User Manual 6 ALARM LED LED indicating that temperature SENSOR B 16 is not connected broken or 27273 short circuited or that the measured temperature goes beyond the shutoff temperature see also 24 The POWER OUTPUT 13 14 shuts down if this LED is on and the MODE switch 5 1s set to SENSOR 7 TEMPERATURE B display Digital display showing the temperature determined by SENSOR B 16 8 INTEGRATION potentiometer Potentiometer to set the INTEGRATION parameter time constant of the temperature controller PI controller time range 50 ms 20 s Potentiometer logarithmic scale to change the GAIN parameter amplification of the error signal see chapter 3 4 of the temperature controller PI controller range 10 to oo Potentiometer to set the voltage range of the POWER OUTPUT 13 14 100 15 Volt 11 HEAT COOL LEDs LEDs that indicate the state of the POWER OUTPUT 13 14 HEAT yellow LED output polarity positive active side will be heated see also chapter 3 5 COOL green LED output polarity negative side will be cooled see also chapter 3 5 12 HEAT ONLY LED HEAT ONLY switch Toggle switch for setting the controller into HEAT ONLY mode The red LED indicates the state of the controller LED on HEAT ONLY version 3 8 page 8
9. UTOFF Digital displays COMMAND INPUT Set value control Temperature OUTPUT A B Power output Limiter Control Measuring accuracy Power requirements Dimensions version 3 8 PTC 10 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 NOT in EXT SENSOR or DIRECT mode 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 value possible XX X C or 0 100 of output voltage DIRECT modes analog outputs 10mV C via BNC connector output impedance 250 15 V 3 5 A continuous 15 V 5 A peak 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 115V 230V AC 60 50 Hz fuse 4 2 A slow 19 rackmount cabinet 19 483 mm 10 250 mm 3 5 88 mm page 20
10. below 20 Caution When operating the HCMIS in cooling mode always use the fluid cooling system to avoid overheating and damage of the Peltier elements These systems are available from ALA Scientific Instruments Please ask npi PTC 10 with HCMIS effects of several gain positions and integrator A Co Co AR 1 gain9 Integrator gain8 s gain6 Co N gain5 temperature C 4 N N O N AR N N 20 T T 1 0 500 1000 1500 2000 2500 3000 time s Figure 6 Time course of temperature regulation of the PTC 10 HCMIS micro incubator connected version 3 8 page 18 10 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 30 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 LJ 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 SH
11. egative referring to ground In both DIRECT modes the control unit is not active i e the output voltage is preset directly by the DESIRED TEMP C control 2 Figure 1 With setting from 000 to 999 the output voltage increases from 0 V to 15 V DIRECT HEAT or 0 V to 15 V DIRECT COOL Note The ALARM circuit see below 15 disabled 1 this mode version 3 8 page 11 10 User Manual Note In DIRECT COOL mode there will not be 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 10 with right polarity HEATING COOLING OPERATION in DIRECT mode The PTC system is designed with bipolar outputs 0 V to 15 Volt DC If a resistive load is used 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 purposes or for cooling active side of the Peltier device in contact with recording chamber If a Peltier device is used for cooling purposes the opposite 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
12. he instrument e Turn all potentiometers to the most left position e switch the MODE selector to the position SENSOR or B 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 Z 0 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 If 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 C because the control loop 15 not yet well adjusted The actual temperature will arrest at 1 to 2 C below the desired temperature Please wait until this steady state value is 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 10 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
13. he protective earth of the line cable while the cabinet 1s always connected via the power supply cable green yellow wire The system can be grounded by connecting plug 22 internal ground or 23 protective earth 24 POWER pressure switch Switch to turn POWER on switch pushed or off switch released version 3 8 page 9 10 User Manual 3 3 Rear Panel Elements LINE VOLTAGE SELECTION 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 FUSE The fuse is also integrated in 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 Always disconnect mains power plug when replacing fuse Caution The instrument may be damaged if the wrong line fuse is installed 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 is 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 is 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 shu
14. i D Electronic 8 Instruments for the Life Sciences n Qa made OPERATING INSTRUCTIONS AND SYSTEM DESCRIPTION FOR THE PTC 10 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 10 User Manual Table of Contents k RESU CNS sateen wae E 3 2 TPC LOC Omp mes E 4 J VIRES octet ances 4 Sols System opel E oes ubt 4 3 2 DESEMIPUON of the Front dede rte a 2 95 RE Panci opi ee eM 10 3 4 Electronic Control and Protection oae 10 2 5 Connection sun PEE 11 5 02 Modes hare ee 11 5 1 the DESIRED TEMPERA TUR Biv 13 d OMNI ta rao NEM I KE M MIL UE E 13 5 Connection of the Sensor DIN Connector Block diagram sse 14 60 Operatine guide Tunings procedure een E rea Pra YOUR ameter eons 16 PTC IO0 and the HCMIS MICEO IICUDATOR reote tape eee ates 18 CONTI CUIOM E T E m 18
15. iature temperature sensor Subminiature temperature sensor PT 100 temperature sensor HCMIS micro incubator HCPC heating cooling perfusion cube H MIC20 heat only micro incubator Recording chambers Heated perfusion tube and heated perfusion cube Thermal foil Objective heater Jp d cmo opo xs ib 3 PTC 10 System 3 1 System Description The PTC 10 temperature control system is designed for heating and cooling purposes in electrophysiological experiments The 10 system provides a temperature controller channel and is housed in a 19 inch standard rackmount cabinet with built in power supply and cooling elements for the power devices The PTC 10 system guarantees low noise operation and has special protection features to prevent the preparation from damage The PTC 10 system incorporates two electronic thermometers for small semiconductor sensor standard 1s R2252 1 e the sensor has a resistance of 2252 at 25 or optionally PT 100 i e 100 at 0 C two digital temperature displays XX X C a 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 15 V DC continuous operation for Peltier elements 1 e heating cooling operation or resistive 1 e heating only loads with electronic protection circuits For heating only applications the bipolar output can be switched to un
16. ipolar operation 15 V The power output 1s short circuit protected the output power is limited electronically Maximum output voltage is approximately 15 V the current 15 limited to 5 A peak current only In continuous operation the current is limited to 3 5 A The system can be connected to the thermistors heating Peltier elements in two ways Using separate cables for the sensors and the heating Peltier 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 10 User Manual Figure 1 PTC 10 front panel view version 3 8 page 5 PTC 10 User Manual In the following description of the front panel elements each element has a number that is 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 1 SHUTOFF TEMPERATURE label Label indicating the upper SHUTOFF TEMPERATURE standard is PERATURE 60 C If the sensor measures the indicated temperature or more the 60 C POWER OUTPUT is disabled 2 DESIRED potentiometer
17. o 0 GAIN set to 0 INTEGRATION off temperature 39 37 35 33 91 29 27 25 0 100 200 300 400 500 600 700 800 900 1000 time s Figure 5 Time course of temperature regulation of the PTC 10 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 10 User Manual 6 1 10 and the HCMIS Micro Incubator Connection Connect the HCMIS using the ALA DIN cable to one of the SENSOR connectors 16 18 Figure 1 The right polarity is 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 and 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 is carried off This is best done by using the fluid cooling system of the HCMIS Without cooling the HCMIS with fluid it is not possible to reach temperatures
18. ort 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 10 Figure 1 The COMMAND INPUT is scaled 10mV C i e 370 mV at this connector would set the DESIRED TEMPERATURE to 37 C Important The 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 C is 150 mV the temperature will be set to 40 C 4 Grounding To avoid ground loops the internal ground of the system is floating 1 1 15 not connected to the protective earth of the mains while the cabinet is 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 10 User Manual 5 Connection of the Sensor DIN Connector Block diagram Cable of temperature sensor OLR IG FIG length 2m red yellow heat shrink tube 20mm heat shrink tube 15mm Imm jack 4 40mm shield blue white sensor E d Imm gold pin 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 10 User Manual
19. round 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 STATIC ELECTRICITY Electronic equipment is 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 TEMPERATURE DRIFT WARM UP TIME All analog electronic systems are 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 In most cases a warm up period of 20 30 minutes is sufficient HANDLING Please protect the device from moisture heat radiation and corrosive chemicals PELTIER ELEMENTS MUST BE MOUNTED ALWAYS ON APPROPRIATE HEAT SINKS TO AVOID DAMAGE THROUGH OVERHEATING version 3 8 page 3 10 User Manual 2 PTC 10 Components The following items are shipped with the PTC 10 system X PTC 10 controller X Power cord 4X User manual Optional accessories Min
20. sensor will now reach the desired temperature possibly after a small overshoot Wait again until the steady state value is reached 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 10 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 is recommended to heat the solution approximately to the desired temperature before perfusing the bath either with a heated perfusion tube HPT 2A 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 10 is shown As resistive load a bulb 12V 21 W was used The temperature sensor was fixed directly on the bulb and sensor and bulb were wrapped with foam Starting temperature was 27 3 C Starting conditions were LIMITER set t
21. t 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 The sensor used for the control must be in good thermal connection with the Peltier element if not unstable operation and damage may occur ALARM CIRCUIT The internal thermometer R2252 or PT 100 sensor inputs are protected by the sensor alarm circuit see above If this thermometer is used as input for the PI controller the ALARM circuit disconnects the power output if the sensor is damaged not connected or if the measured temperature goes beyond the shutoff temperature see also 24 Figure 1 This status is indicated by the red ALARM LED Important In DIRECT or EXT SENSOR mode the ALARM circuit is disabled version 3 8 page 10 10 User Manual 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 10 is 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 10 Quick installation I Connect the active side to the pole 13 Figure 1
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