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Summary of Contents for NPI PTC-20
- Page 1 OPERATING INSTRUCTIONS AND SYSTEM DESCRIPTION FOR THE PTC-20 PELTIER TEMPERATURE CONTROL SYSTEM VERSION 4.1 npi 2020 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...
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Page 2: Table Of Contents
5.1. Available sensors ......................15 5.2. Block diagram ......................16 6. Operating guide – Tuning procedure ................17 6.1. PTC-20 and the HCMIS Micro-Incubator ..............19 Connection ........................19 Operation ........................19 6.2. Operation with HPT-2A Heated Perfusion Tube (discontinued) ........ 20 7. -
Page 3: Safety Regulations
(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. -
Page 4: Ptc-20 Components
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. -
Page 5: Description Of The Front Panel
PTC-20 User Manual ________________________________________________________________________________________________________________ 3.2. Description of the Front Panel Figure 1: PTC-20 front panel view ___________________________________________________________________________ version 4.1 page 5... - Page 6 Some elements are grouped in functional units (e.g. MODE of operation unit) and are described as units regardless of the order of numbers. The 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).
- Page 7 PTC-20 User Manual ________________________________________________________________________________________________________________ (5, 16) GAIN potentiometer 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.
- Page 8 PTC-20 User Manual ________________________________________________________________________________________________________________ (9) ALARM LED LED that indicates that the temperature SENSOR A is not connected, broken or short- circuited. The POWER OUTPUT (32/33) shuts down if this LED is on and the MODE switch (8) is set to SENSOR A.
- Page 9 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...
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Page 10: Rear Panel Elements
PTC-20 User Manual ________________________________________________________________________________________________________________ (31, 22) OUTPUT 10mV / °C 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). -
Page 11: Connection Of Peltier Elements
(depending on the amount of heated solution). 3.5. Connection of Peltier Elements The PTC-20 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”... - Page 12 (EXT. SENSOR 1mV / °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 5 gives an overview of the operation modes of the PTC-20. ___________________________________________________________________________ version 4.1 page 12...
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Page 13: Setting 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-20 leaves this temperature window the internal shut-off unit disconnects the power output. -
Page 14: Temperature Sensors / Block Diagram
PTC-20 User Manual ________________________________________________________________________________________________________________ 5. Temperature sensors / Block diagram 5.1. DIN Connector Figure 2: How to connect the temperature sensor ___________________________________________________________________________ version 4.1 page 14... -
Page 15: Available Sensors
PTC-20 User Manual ________________________________________________________________________________________________________________ Figure 3: Connector pinout of the DIN connector (pins 1 and 3 are connected internally) 5.1. Available sensors Figure 4: Temperature sensors and cable. The sensors come with a connection cable (TS-CAB, see Figure 4, left) with a DIN connector on one end and two 1 mm connectors on the other end. -
Page 16: Block Diagram
PTC-20 User Manual ________________________________________________________________________________________________________________ 5.2. Block diagram Figure 5: Block diagram of the PTC-20 ___________________________________________________________________________ version 4.1 page 16... -
Page 17: Operating Guide - Tuning Procedure
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. - Page 18 As mentioned above it is very important that the sensor element and the heating / cooling element are in good thermal connection. In Figure 6 the time course of temperature regulation of the PTC-20 (channel A) is 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.
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Page 19: Ptc-20 And The Hcmis Micro-Incubator
Integrator gain8 gain7 gain6 gain5 gain4 gain3 1000 1500 2000 2500 3000 time (s) temperature… Figure 7: Time course of temperature regulation of the PTC-20, HCMIS micro-incubator connected to channel A ___________________________________________________________________________ version 4.1 page 19... -
Page 20: Operation With Hpt-2A Heated Perfusion Tube (Discontinued)
PTC-20 User Manual ________________________________________________________________________________________________________________ 6.2. Operation with HPT-2A Heated Perfusion Tube (discontinued) For use with HPT-2A from ALA please follow these hints. 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. -
Page 21: Technical Data
PTC-20 User Manual ________________________________________________________________________________________________________________ 8. Technical Data Sensor input: for semiconductor 2252 at 25 °C (standard) or platinum 100 at 0 °C, accuracy typically 0.1 °C at 25 °C, with electronic protection Sensor input (EXT. Mode): 1mV / °C...
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