Extech TM200 Operating Manual

User Guide

Type K Dual Input Thermometer
Model TM200

Introduction

Congratulations on your purchase of the Extech TM200 Type K Dual Input Thermometer.
This instrument offers a dual thermocouple input and a multifunction LCD display.
Additional features include differential temperature measurement (T1-T2), Data Hold,
push-button Offset adjustment, and MIN/MAX/AVG displays. This meter is shipped fully
tested and calibrated and, with proper use, will provide years of reliable service.

Meter Description

1. LCD display

2. T1, T2, T1-T2 display select button

3. Power button

4. SETUP button

5. Backlight button

6. Min/Max button

oC o

7.

8. Data Hold button

9. Down arrow button

10. ENTER button

11. Up arrow button

12. T2 Thermocouple input socket

13. T1 Thermocouple input socket

Note: The battery compartment is located on the back of the instrument under the
protective jacket. Remove the rubber protective jacket that encases the meter to access
the compartment. The tripod mount access is also on the back of the instrument above
the tilt stand.

F Kelvin (oK) select button

1

2

3
4
5

6

12

13

7

Safety

Please read the safety information and operation instructions before operating this
instrument.

• To avoid electrical shock, do not use this instrument when voltages at the
measurement surface exceed 24V ac or 60V dc.

• To avoid electrical shock or personal injury, do not apply more than 20V ac rms,
between the thermocouples, or between any thermocouple and earth ground.

• If voltage on the measurement surface results in potentials of more than 1V,
measurement errors may occur.

• If a potential exists between the thermocouples, use electrically insulated
thermocouples

• To avoid meter damage and burn hazards, do not use this instrument to measure
temperature in a microwave oven.

• Avoid repeated sharp flexing of the thermocouple wire as this can cause
thermocouple lead breakage. To prolong lead life, avoid sharp bends in the leads,
especially near the connector.

• The meter can display temperature as high as 2501
supplied thermocouple is rated for 500
temperatures, a high-temperature thermocouple (not supplied) must be used.

This symbol on the instrument indicates that the operator must refer to an

!

explanation in this manual.

o

F (260oC). To measure higher

o

F (1372oC), however, the

11
10
9

8

TM200 V4.1 11/06 2

Operation

Connecting thermocouples

1. This meter accepts one or two thermocouples. Only type K thermocouples with spade
plugs (sub-miniature type with one spade wider than the other) may be used.

2. Plug one thermocouple into the meter's T1 input jack and optionally plug another
thermocouple into the meter’s T2 input jack.

Turn Power ON

1. Press the button to turn the meter on.

2. If a probe is not inserted to the meter, dashes “-----” will appear on the display.

Selecting

Taking Measurements

o

C / oF / Kelvin (oK) unit of measure

o

Use the

C / oF / K button to select the desired unit of measure.

Hold the thermocouple in air or touch the tip of the thermocouple to a device under test
and read the temperature on the meter’s LCD. If the measured temperature exceeds the
meters high or low limits, ‘OL’ will appear in place of a temperature reading.

Important Note: The supplied thermocouples are rated for 500

o

F (260oC). To measure
higher temperatures, a high-temperature Type K thermocouple (not supplied) must be
used.

Display resolution

The meter has a 0.1

o

for temperatures 1000o and higher.

1

o

resolution on displays ranging from 0.1o to 999.9 o. The resolution is

Selecting T1, T2, and T1-T2 Displays

Use the T1, T2, T1-T2 button to select the desired display configuration

• When the meter is turned on, the T1 thermocouple reading is displayed on the

primary display and the T2 reading is displayed on the secondary (smaller display).

• First press of the button: The T1 and T2 displays switch places (the T2 reading is now

on the primary display and the T1 reading is on the secondary display)

• Second press: The differential (T1-T2) is shown on the primary display and the T1

temperature reading is shown on the secondary display.

• Third press: The differential value (T1-T2) is shown on the primary display and the T2

temperature reading is shown on the secondary display.

• Fourth press: The display configuration loops back to the start up condition (the T1

reading is displayed on the primary and the T2 reading is displayed on the secondary)

Backlight

Press the backlight button to switch on the LCD display backlight. Press the button
again to turn the backlight off. Judicious use of the backlight feature will conserve battery
power.

Data Hold

Press the HOLD button to freeze the readings in the display. The 'HOLD' icon will appear
above the temperature reading on the display. Press the HOLD button again to return to
normal operation (the 'HOLD' hold icon will disappear).

Tripod Mount

The tripod mounting connector is located on the back of the meter. Tripods are available
through Extech Instruments distributors.

TM200 V4.1 11/06 3