NPI MTC-20/2S Betriebsanleitung

OPERATING INSTRUCTIONS AND

SYSTEM 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

[email protected]; http://www.npielectronic.com

MTC-20/2S User Manual

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Table of Contents

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 Protection Circuits ................................................................. 9

3.5. Modes of Operation..................................................................................................... 9

Modes of Operation Overview.................................................................................... 10

3.6. Setting the DESIRED TEMPERATURE.................................................................... 10

4. Grounding........................................................................................................................... 11

5. Connection of the Sensor / DIN Connector........................................................................ 11

6. Operating guide – Tuning procedure.................................................................................. 13

7. Literature............................................................................................................................. 16

8. Technical Data.................................................................................................................... 16

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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 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.

2) 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 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 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.

4) 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 (i.e. after internal temperature has

reached steady-state values). In most cases a warm-up period of 20-30 minutes is

sufficient.

5) HANDLING: Please protect the device from moisture, heat, radiation and corrosive

chemicals.

6) INSTRUMENT COOLING: To prevent damage from overheated components, adequate

airflow around the heat sink in the rear of the instrument must be ensured.

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2. MTC-20/2S Components

The following items are shipped with the MTC-20/2S system:

 MTC-20/2S desktop cabinet

 Power cord

 User manual

Optional accessories:

 Miniature temperature sensor

 Subminiature temperature sensor

 PT 100 temperature sensor

 Recording chamber

 ALA DIN connector cable assembly

 Heated perfusion tube

 Thermal foil

3. MTC-20/2S System

3.1. System Description

The MTC-20/2S temperature control system is designed for heating purposes in

electrophysiological experiments. The MTC-20/2S system is housed in small desktop cabinet

that can be placed close to the microscope, with built-in power supply and cooling elements

for the power devices. The system 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

(R2252, i.e. the sensor has a resistance of 2252 Ωat 25 °C), two digital temperature displays

(XX.X °C), a set-point control with digital readout (XX.X °C), a PI (proportional-integral)

controller with adjustable parameters, an output power control unit and a high-power output

stage (DC, continuous operation) for resistive ( i.e. heat only) loads with electronic protection

circuits. The power output is short circuit protected, the output power is limited electronically.

Maximal output voltage is approximately 12 V, the current is limited to 1 A.

The system can be connected to the thermistors / heating 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 elements

A large variety of sensors and thermal elements are available (see also Optional accessories

in chapter 2). Please contact npi for details.

MTC-20/2S User Manual

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3.2. Description of the Front Panel

Figure 1: MTC-20/2S front panel view

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) DESIRED TEMP./°C potentiometer

Potentiometer to set the working temperature of the controller system. If the

display mode switch (11) is in position SETPOINT the preset value is

monitored on display A (2). Range: +25 °C….+50 °C.

(2) Display A

Digital display to indicate the DESIRED TEMPERATURE, the

temperature determined by SENSOR A or the voltage at the POWER

OUTPUT connectors (18/19). The function is selected by the display

mode switch (11).

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(3) ALARM LED

This LED lights if temperature SENSOR A (13) is not connected, broken or short-

circuited. The POWER OUTPUT (18 / 19) shuts down if this LED is on and the

MODE switch (14) is set to SENSOR A.

(4) 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),

range: 10 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 the temperature determined by sensor B

(16).

(7) ALARM LED

This LED lights if temperature SENSOR B (16) is not connected, broken or short-

circuited. The POWER OUTPUT (18 / 19) shuts down if this LED is on and the

MODE switch (14) is set to SENSOR B.

(8) LIMITER potentiometer

Potentiometer to set the voltage range of the POWER OUTPUT (18 / 19),

100% = 12 Volt.

(9) HEAT LED

This LED indicates the status of the POWER OUTPUT (18 / 19)

(LED on = heating).

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(10) 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.

(11) SENSOR A / SETPOINT / PWR OUT switch (display mode switch)

Switch to select the mode of display A (2):

SENSOR A (upper position): the temperature determined by SENSOR A

(13) is displayed (XX.X °C)

SETPOINT (middle position): the value preset at the DESIRED

TEMPERATURE

potentiometer (1) is displayed (XX.X °C)

PWR OUT ( (lower position): the voltage at the POWER OUTPUT (18 /

19) is displayed.

(12) OUTPUT A 10mV/°C connector

BNC connector monitoring 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

(max. 12V DC and 1A) for devices with the ALA DIN connector cable assembly.

(e.g. HPT-2A, see www.alascience.com).

(14) MODE switch

Switch to select the operation modes of the MTC-20/2S. Four modes

are available:

SENSOR A: the temperature determined by SENSOR A (13) is

used for the control system

DIRECT: the voltage at the POWER OUTPUT (18 / 19) can be

set directly from the DESIRED TEMPERATURE

potentiometer (1) (0-12 V, no control)

EXT. SENSOR (EXTERN SENSOR): an external thermometer

connected to BNC (15) (sensitivity 1mV/°C) can be

used for the controller loop

SENSOR B: temperature determined by SENSOR B (16) is used as

feedback temperature in the controller loop.

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(15) EXT. SENSOR 1mV/°C connector

BNC connector to connect external thermometer with a voltage output of 1mV/°C

(see (14)).

(16) SENSOR B connector

8-pole connector for temperature SENSOR B.

This connector also provides the POWER OUTPUT (18 / 19) for the heating unit

(max. 12V DC and 1A) for devices with the ALA DIN connector cable assembly.

(e.g. HPT-2A, see www.alascience.com).

(17) OUTPUT B 10mV/°C connector

BNC connector monitoring the temperature determined by SENSOR B (16),

sensitivity: 10mV / °C.

(18) / (19) POWER OUTPUT Max. 1A DC connectors

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

connectors (16) for devices with the ALA DIN cable assembly.

3.3. Rear Panel Elements

POWER: The PWR switch turns on/off the power supply (115/ 230 V AC, max. 50 W). The

selector for the line voltage and the connector for the power cord are located on the rear panel

of the instrument.

FUSE: Line fuse: 0.8 A slow (115 V) or 0.4 A slow (230 V). It must be replaced only by

specified type. Please disconnect mains power plug when replacing fuse.

Caution: The instrument may be damaged if the wrong line fuse is installed e.g. 0.4 A if the

MTC-20/2S is operated at 115 V!

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3.4. Electronic Control and Protection Circuits

CONTROL LOOP

The sensor / thermometer, PI-controller, output power stage and heating 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 heating element (see also Figure 4).

ELECTRONIC PROTECTION CIRCUITS

Each system is 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: The sensor used for the 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 circuit (see

above). If this thermometer is 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 is 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. Modes of Operation

The system can be used in the following modes of operation:

DIRECT mode

DIRECT mode (no temperature control): the MODE switch (14, Figure 1) is set to the

DIRECT position. The control unit is not active, i.e. the output voltage is preset directly at the

DESIRED TEMP. control (1, Figure 1). With the setting from 25 to 50 the output voltage

increases linearly from 5 V to 12 V. The ALARM circuit (see below) is disabled in this mode.

The MTC-20/2S is designed with an unipolar output. If a resistive load is used, the system

can be used for heating purposes in all modes (SENSOR and DIRECT).

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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

selected by the MODE switch.

 The SENSOR A or SENSOR B position selects one of the internal thermometers

(SENSOR A or SENSOR B) which use a small semiconductor sensor. The measured

temperature is shown at the respective digital display unit (2or 6, Figure 1

respectively, XX.X °C).

 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 (3or 7, Figure 1 respectively) located just above the sensor connectors.

EXT. SENSOR mode

This mode can be used to connect an external thermometer. The calibration of the external

input (SENS. INPUT BNC, (15, Figure 1)) is 1 mV / °C. If this option is used the internal

ALARM circuit is disabled.

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 SENSOR B.

EXT. SENSOR mode: output voltage is controlled by the PI controller using an external

thermometer.

POWER OUTPUT is always available at POWER OUTPUT, SENSOR A and SENSOR B.

3.6. Setting the DESIRED TEMPERATURE

There are two ways to set the DESIRED TEMPERATURE:

1. The easiest way is to use the potentiometer DESIRED TEMP. / °C. The temperature

can be set with this potentiometer from +25.0 °C to +45.0 °C. If the MTC-20 leaves

this temperature window the internal shut-off unit disconnects the power output. This

could be the case if the sensor is broken or short-circuited.

2. If the user wants to have external control (e.g. with a computer system) or to set the

temperature to lower (<25 °C) values, 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 / °C 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 !!

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