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Yokogawa TM20 Digital Thermometer



  • Supports type K/J/E/T thermocouples.
  • Analog signal input.
  • 2-channel simultaneous measurement.
  • Allows switching between collector mode or logging mode. Collector mode records the measured temperature along with the measured item, name of the person taking the measurement, date and time of measurement in response to a key action.
  • Logging mode continuously records the measured temperature at present time record.
  • Allows input of comments regarding measurement process.
  • Easy to manage PC data (automatic layout in Excel).
  • High data capacity.
  • Collector mode only: 5000 data units.
  • Logging mode only: 20,000 data units.
    (Allows mixing of collector mode and logging mode measurement data).
  • 2-channel simultaneous measurement is recorded as two data points


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SKU: Yokogawa TM20 Categories: , Tags: ,
Yokogawa TM20 Features:
Thermocouple probes(-200°C to 1372°C) [-328°F to 2501.6°F] Type K:-200°C to 1372°C[-328°F to 2501.6°F] Type E:-200°C to 700°C[-328°F to 1292°F] Type J:-200°C to 1000°C[-328°F to 1832°F] Type T:-200°C to 400°C[-328°F to 752°F] (Possible temperature ranges with the TM20)Analogue signal input

The TM20 can accept inputs from a sensor that outputs voltage signals ranging ±100 mV or ±1 V. A U-shaped Miniature connector is required.

Memory Key

Each press of this key saves the measured data, along with 3 other monitoring items: the name of the object being measured, operator’s name, and date and time of measurement.

Selection of registered tag name

Select from the list of up to 50 registered tag names (objects to be measured).

Collector/Logging mode selector key

Switches between the collector mode (saves measured data when necessary) and logging mode (saves measured data continuously).
When used in the collector mode only, saves up to 5000 data items.
When used in the logging mode only, saves up to 20000 data items.
Measuring interval: 1 second to 24 hours (Under simultaneous 2-channel measurement with the TM20, 2 seconds is the minimum.)
Start-of-measurement time: timer can be set.

User-friendly FUNC key

You can select setup items in the same way as you choose options from the built-in menu of a cellular phone.

Selection of operator name

With the (1) key, you can recall a list of up to 10 operator names and can also change any of these names.

Record-keeping on measurement failure handling

By pre-registering a list of up to 32 comments on how to handle particular measurement failures, you can keep records of how the measurement failure was dealt with by selecting the desired comment from the list using the (4) key.
(The TM10 supports this feature with TM10 Version 1.10 when used with application software version 1.30 or later.)

Setup Keys

Register tag names, set alarm points, and define measuring conditions, such as the measuring in-terval for the logging mode. These setting tasks can also be carried out from a PC.

Digital Input Terminals

For connecting an optional non-contact probe

RS-232C I/O terminals

Used to exchange data with a PC or send data to a dedicated printer.

Yokogawa TM20 Specifications  (Thermocouple Measurement Ranges)
Type ‘K’ Thermocouple -200°C to 1372°C -328°F to 2501.6°F
Type ‘J’ Thermocouple -200°C to 1000°C -328°F to 1832°F
Type ‘E’ Thermocouple -200°C to 700°C -328°F to 1292°F
Type ‘T’ Thermocouple -200°C to 400°C -328°F to 752°F
Voltage Input ±100mV, ±1V
Thermocouple Resolution 0.1°C 0.1°F
Voltage Input Resolution 0.1mV or 0.001V
General Specifications
Power Supply Two (2) type ‘AA’ Alkaline batteries
Dimensions 151mm (L) x 56mm (W) x 33mm (D)
Weight 180g
Ordering Information
Yokogawa 54011 TM20 Digital Thermometer


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