Some Frequently Asked Questions:

Fine thermocouples (ø25 µm) have a time constant of less than 2ms (two thousandths of a second).

The accurate measurement of the time constant of a thermocouple was not possible in the past, as until now there were no temperature change processes of less than 2 ms. Thus, one of our clients was able to measure a 3000 rpm intake-air temperature accurately with our 25 µm fine thermocouple. This means one cycle takes 20 ms. To show a very fine temperature curve, we need at least 10 measuring points, giving 2 ms between measuring points (a 2 ms time constant).

If faster temperature change equipment becomes available in the future, ANBE’s thermocouple might be able to measure even faster and more accurately. See detail

To get faster responsiveness, ANBE uses nonstandard wires based on JIS (Japan Industrial Standard). There are no heat resistance data for the JIS wires in ANBE's thermocouples. The following data have been collected from our experiments and reports from our clients. ​


K-type ø 25μm Fine thermocouple

This was durable at 800°C, for two days in the air.

K-type ø 13μm Fine thermocouple

This is durable at an average temperature of 400°C for one hour, but fails at 800°C.

K-type 40µm thickness Sheet thermocouple and ø 200µm Multipurpose thermocouple

These were durable at 900°C, at least 20 hours in the air.

ANBE's thermocouples are mainly used in laboratory work, R&D departments, universities and governmental institutions, in the following industries:

  • Electronics
  • Motor Industry
  • Heavy Industry
  • Chemical
  • Airlines
  • Defense
  • Biotechnology
  • Medical

For example, thermocouples are used to measure the following temperatures:

  • Air-breathe temperature inside an engine
  • Rocket booster surface
  • Inside of vacuum furnace (including manufacture compression fitting)
  • Underfill material inside FC
  • Inside a battery cell
  • One biological cell (patch clamp experiment )
  • Cutting instruments (drill, end mill etc.)
  • Pulse heater tip (sheet thermocouple tightened up with a screw )
  • Paper surface inside a printer
  • IC junction (for emergency shutdown)
  • Pipe surface
  • Underside of a leaf
  • Baby’s breath
  • Ultra-thin heat spreader
  • Solar battery
  • Molten plastic in mold injections by integrated thermocouples
  • Surface of a needle

If an ANBE thermocouple does not give an optimal result, some possible causes are as follows: ​

1. Is this the right thermocouple for your experiment?

Example 1:   Our multipurpose thermocouple is not suitable for fast temperature changes. It is better to use our fine or sheet thermocouples (for surfaces). ​

Example 2: If you are measuring electrically conductive materials, the thermocouples should be well insulated. For example, when measuring the temperature of an electrically conductive solution, a Teflon insulated thermocouple must be used, with the bare wire also insulated (except the junction part of the tip). 

2. Is the fixing method correct?
If too much adhesive material is used, this material itself absorbs heat. Due to this, the heat capacity becomes larger, and a fast response is therefore not achievable.

If you are using a material with low heat conductivity to fix our thermocouples, this can also reduce the response. ​

3. Does your data logger have a fast enough sampling time?
Depending on your experiments, you may need a faster sampling time. Our favorite GL-900 series has a maximal 10 µs sampling time. Download brochure for GL900-4(4ch) / GL900-8(8ch).

We are using Japanese thermocouple wires, which are marked as follows:

Red insulation          : + (positive)
White insulation       : - (negative) 

As well as the quality of the thermocouple, the fixing method is also very important in obtaining a high response and a correct temperature. For more detail, please read here

Simplified recommendations

Type of thermocoupleFixing method* Heat Resistance (°C)
Fine thermocouple  

High-temperature solder

(Pb90% Sn8% Ag2%)

295°C (melting point)

Ag paste

(Thermal conductivity: 9.1W/m-K R)

(Polyimide tape) 260°C
Sheet thermocouple Polyimide tape 260°C
Multi-purpose thermocouple  

High-temperature solder

(Pb90% Sn8% Ag2%)

295°C (melting point)

Ag Paste

(Thermal Conductivity: 9.1W/m-K R)

(Polyimide tape) 260°C
Fine & Sheet thermocouple  

High-temperature solder

(Pb90% Sn8% Ag2%)

295°C (melting point)

Ag paste

(Thermal conductivity: 9.1W/m-K R)

Polyimide tape 260°C

(*) The above heat resistances are those of our products. Those of other companies may vary.


Consult our FAQ section


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