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Ruggedized Thermometer

The TL1-W intrinsically safe thermometer is a modified field version of our successful TL1-A thermometer. It features a rugged frame for reinforcement and is designed for continuous operation, but can be easily powered off if desired.

The TL1-W thermometer is intended to be used anywhere a precision glass stem thermometer or other type thermometer may be used. The TL-1W incorporates glass thermometer simplicity and reliability with the ease of a digital display. Like precision mercury thermometers, the TL1-W has accuracy, repeatability and long-term stability. But unlike those thermometers there will never be problems with mercury separation or hazardous material cleanup. Different from most precision electronic thermometers, the "cordless" TL1-W has no wires to get in the way or break. Battery replacement is easily done through a sealed cover. Encoded calibration is unaffected by temperature, vibration or battery removal. Low battery display, and failure mode indications protect the user from false data.

4 Point NIST Traceable Calibration and a one year warranty included.



  • Minimum reading
  • Maximum reading
  • Averaging
  • Easy °F to °C switching
  • Backlight
  • Sturdy frame
  • Display arrows indicate increasing or decreasing temperature


LCD with 0.25 inch characters
Trend Indicating Arrows
Low Battery & Fault indication

User Functions:

Auto-off after 20 minutes or continuous operation
Lowest Reading, Highest Reading, Average Reading
Switchable in Units of °F or °C
Display tenths or hundredths resolution


Stainless steel temperature sensor; Standard Sensor length 8" (20cm)
Standard diameter 1/4" (6.35mm) with reduced diameter tip of 3/16" (4.76mm)
Sturdy Acetal frame surrounding aluminum enclosure
Electronics and display in 3.5" x 1.2" anodized Aluminum enclosure
Molded Silicone seal.
Highly durable display window, graphics and membrane switches.


6.5 ounces, 180 grams


Resolution 0.01 Degrees
Calibrated Accuracy:
±0.1°F from 14 to 320°F
±0.06°C from -10 to 160°C
NIST Traceable Report of Test

Temperature Time Constant:

8 seconds in circulated water bath
(63.2% response to temperature change)


Ultra Low Power Microcontroller
FLASH Memory
20 bit A/D Converter
Recommended Ambient Temperature Range for Best Accuracy 32° to 112°F, 0° to 44°C


100 Ohm, Class A 1/3 DIN RTD
Immersion depth 4", 11cm


2 AAA Alkaline; Duracell MN2400
Battery Life several hundred hours depending on backlight usage
Battery Operating Range -4 to 130°F, -20 to 54°C
Note: Battery may not provide adequate power if ambient temperature is below -4°F, -20°C or above 130°F, 54°C

Specifications subject to change

Typical Applications

Distillations, temperature baths, melting point tests, flash point tests, reference, thermowells, provers, temperature calibration for flow meters.





View Datasheet TL1-W

View User Manual TL1-W

View Atex Certificate



Hartwig instruments
Pottebakkerstraat 15
NL3194AD Rotterdam-Hoogvliet
Tel: +31(0)10-438-5286
Fax: +31(0)10-438-2099
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