Forehead Thermometer 2…5 cm distance, 35…42℃ - ST631

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  • Forehead Thermometer 2…5 cm distance, 35…42℃ - ST631
  • Forehead Thermometer 2…5 cm distance, 35…42℃ - ST631


Household and Forehead non-contact Infrared Thermometer - ST631

Dual temperature measurement, hygienic, quick response


The Sentry infrared thermometer measure temperature from a distance. it detects infrared light emitted from an object and focus it onto a detector. This way the thermometer determines the temperature of whatever it is pointed at.

ST631 from Sentry is a non-contact infrared thermometer. It can be used for human temperature evaluation and also household appliances.

This non-contact infrared Thermometer provides:

  • Dual temperature measurement including forehead and normal temperature
  • Non-contact and Hygienic without changing cap or touching different human bodies, preventing infection
  • Simply press the trigger and read the temperature on a large digital display
  • Special design for detecting the deviating from normal temperature measurement on the human body
  • Easy and simple to operate, quick response
  • °C / °F Switchable
  • Backlight

Measurement range

The ST631 provides two separate temperature measurement ranges for each forehead and normal temperature:

  • Forehead: 35 to 42℃ (95 to 107.6℉)
  • Household: 0 to 100℃ (32 to 212℉)


Also, this thermometer features two different accuracies for its two temperature ranges:

  • Forehead: ±0.3℃ (±0.5℉)
  • Household: ±1℃ (±1.8℉)


Resolution of a thermometer is the smallest change in temperature which it can detect. For the ST631, resolution is 0.1℃ (0.1℉).

Response time

There is also a difference between response time of this thermometer in household and forehead modes:

  • Forehead: 1 sec
  • Household: o.5 sec

Detection distance

The best performance the case study infrared thermometer performs in, is 2 to 5 cm from forehead or any other measuring objects.

Series Information

ST631 Series

Forehead Infrared Instrument

The SENTRY ST631 series is a non-contact infrared measuring instrument for the forehead that can also be used to test household appliances.

ST631 Series main features

  • Forehead: 35 ~ 42℃ (95 ~ 107.6℉)
  • Household: 0 ~ 100℃ (32 ~ 212℉)
  • Accuracy: ±0.3℃ (±0.5℉) for Forehead / ±1℃ (±1.8℉) for Household
  • Thermopile: 5 ~ 14 µm
  • °C / °F Switchable
  • Backlight
  • 156 x 100 x 32 mm Dimensions

As being an outstanding designer & manufacturer for Infrared Technology, Sentry Optronics Corp. is committed to exceeding their customer’s requirements and providing the highest grade of technical support. They are always on the cutting edge of technology and integrate the engineering, quality, manufacturing, and sales closely to become an impeccable developing team. They are situated in China with two manufacturing plants, one in Shanghai and one in Beijing.

About Sentry infrared thermometer:

Sentry offers complete infrared solutions for diversified applications, including infrared temperature guns, gas detectors, environment measurement instruments and other test equipment. Some different models of infrared thermometers are:

  • ST630/ST632: economical infrared thermometer
  • ST633: Infrared thermometer
  • ST640/ST642/ST643: intelligent non-contact infrared temperature measuring instruments
  • ST650/ST652/ST653: non-contact infrared temperature measuring instruments
  • ST656/ST658: infrared thermometer for low temperature applications
  • ST660/ST662/ST663: infrared thermometer for high temperature applications
  • ST685/ST688/ST688PLUS/ST689: high performance infrared temperature measuring instruments
  • ST670/ST672/ST675/ST677: high performance infrared thermometers


You may be interested to see this product's catalog. If so, please click to view the ST631 datasheet.
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Warranty Information

One Year Warranty
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Additional Information

Forehead Temperature Range:
35...42°C (95...107.6°F)
Household Temperature Range:
0...100°C (32...212°F)
Forehead Accuracy:
±0.3°C (±0.5°F)
Household Accuracy:
±1°C (±1.8°F)
0.1°C (0.1°F)
Forehead Response Time:
1 sec
Household Response Time:
0.5 sec
2...5cm (0.79"...1.97")
5...14 µm
±1°C (±2°F)
Auto Power-off:
Automatically after approx. 20sec
Storage Temp.:
-10~60°C (14~140°F)
°C / °F Switchable:
Battery Type:
9V(006P, IEC6F22, NEDA1604)
156x100x32 mm(6.14"x3.94"x1.26")
125g (4.41 oz.)
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