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MTC-20/2S User Manual

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Figure 4: Block diagram of the MTC-20/2S

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version 2.7

page 12

Содержание MTC-20/2S

Страница 1: ...DESCRIPTION FOR THE MTC 20 2S TEMPERATURE CONTROL SYSTEM VERSION 2 7 npi 2006 npi electronic GmbH Hauptstrasse 96 D 71732 Tamm Germany Phone 49 0 7141 9730230 Fax 49 0 7141 9730240 support npielectron...

Страница 2: ...ntents 1 Safety Regulations 3 2 MTC 20 2S Components 4 3 MTC 20 2S System 4 3 1 System Description 4 3 2 Description of the Front Panel 5 3 3 Rear Panel Elements 8 3 4 Electronic Control and Protectio...

Страница 3: ...riate 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 cabi...

Страница 4: ...ystem guarantees low noise operation and has special protection features to prevent the preparation from damage The MTC 20 2S incorporates two electronic thermometers for small semiconductor sensors R...

Страница 5: ...e type of the element in lowercase letters Then a short description of the element is given 1 DESIRED TEMP C potentiometer Potentiometer to set the working temperature of the controller system If the...

Страница 6: ...to 5 INTEGRATION potentiometer Potentiometer to set the INTEGRATION parameter time constant of the temperature controller PI controller time range 50 ms 20 s 6 Display B Digital display to indicate t...

Страница 7: ...the temperature determined by SENSOR A 13 sensitivity 10mV C 13 SENSOR A connector 8 pole connector for temperature SENSOR A This connector also provides the POWER OUTPUT 18 19 for the heating unit ma...

Страница 8: ...onnectors Banana jack connectors for the heating unit This output supplies a maximum voltage of 12V DC and a maximum current of 1 A POWER OUTPUT is also available at the SENSOR A 13 and SENSOR B conne...

Страница 9: ...control must be in good thermal connection with the heating wire If not overheating and damage may occur ALARM circuit The internal thermometer R2252 sensor inputs are protected by the sensor alarm ci...

Страница 10: ...bled Modes of Operation Overview 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 SENSO...

Страница 11: ...e 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 5 Co...

Страница 12: ...__________________________________________________________________________________________________ Figure 4 Block diagram of the MTC 20 2S _____________________________________________________________...

Страница 13: ...tage Please follow these instructions step by step to avoid problems in adjusting the instrument Turn all potentiometers to the most left position switch the MODE selector to the position SENSOR A or...

Страница 14: ...rshoot Wait again until the steady state value is reached If the desired temperature is not reached first set the GAIN to a slightly higher level and then if necessary raise the INTEGRATION Note The s...

Страница 15: ...pped with foam Starting temperature was 27 3 C Starting conditions were LIMITER set to 0 GAIN set to 0 INTEGRATION off 25 27 29 31 33 35 37 39 0 100 200 300 400 500 600 700 800 900 1000 time s tempera...

Страница 16: ...s below 3 C not connected or broken sensor or above 45 C short circuited sensor Digital displays 3 1 2 digits XX X C temperature of SENSOR A or B or XX X V voltage at POWER OUTPUT COMMAND INPUT BNC co...