ThermoProbe Inc.

Model TL1-W - Digital Portable Stem Laboratory Thermometer



The TL1-W is an intrinsically safe digital laboratory thermometer designed for use in hazardous locations. The TL1-W is an improved version of the original ThermoProbe model TL1. The TL1-W is intended to be used anywhere a precision glass stem thermometer or other type thermometer is used. The TL1-W incorporates glass thermometer simplicity and reliability with the convenience of a digital display. Like precision mercury thermometers, the TL1-W has accuracy, repeat-ability and long-term stability. But unlike those thermometers there will never be problems with mercury separation or hazardous material cleanup. The TL1-W is commonly used as a calibration reference for field temperature instruments such as gauging thermometers and flow meters. With a history of proven accuracy, The TL1-W has become a standard for temperature in multiple industries.

The versatile software functions allow easy selection of Celsius or Fahrenheit units and display resolution. Encoded calibration is unaffected by temperature, vibration, or battery removal. Low battery display, and failure mode indications protect the user from false data. The intuitive display indicators allow the user to establish accurate temperature readings. Minimum, maximum and average temperatures are automatically stored to memory for later reference.

The TL1-W is constructed with a heavy-duty aluminum housing and stainless steel temperature probe. The TL1-W is well suited to thermal well application due to a horizontal display and a versatile bulk head style fitting. Different from many electronic thermometers, the “Cordless” TL1-W has no wires to get in the way or break. The sealed overlay switch interface makes for intuitive operation. The TL1-W comes equipped with easily replaceable AAA batteries, providing up to 200 hours of operation.


The TL1-A certifications are recognized in Europe (ATEX) and internationally (IECEx).

A one year warranty, protective case and NIST traceable 4 point calibration report are included.

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LCD with 0.25 inch characters
Backlit Display
Trend Indicating Arrows
Low Battery & Fault indication
Resolution 0.1 or 0.01

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

ATEX & IECEx (Ex ib IIC T4)

Rugged Anodized Aluminum Frame and Enclosure with silicone seal and a polyester graphics window.
Nominal Body Dimensions: 3.9 x 1.6 x 1.8″ (10 x 4.1 x 4.6cm)
Highly durable display window, graphics and membrane switches.

6.35oz (180 grams)
with 8″ sensor

Resolution 0.01 Degrees
Calibrated Accuracy:
±0.1°F from 14 to 320°F
±0.06°C from -10 to 160°C
Range: -40°F to 400°F (-40°C to 204°C)
NIST Traceable Report of Test

Temperature Time Constant    
6.5 seconds in circulated water bath
(63.2% response to temperature change)

Microcontroller and precision 20 bit A/D Converter
FLASH memory
Recommended Temperature Range For best Accuracy 32 to 112°F, 0 to 44°C

Stainless Steel RTD temperature sensor

  • 100Ω Shock resistant Thin Film RTD
  • Standard 8″(20cm) or 12″(30cm) lengths
  • Standard 0.25″(6.35mm) diameter with 0.188″ (4.76mm) reduced tip
  • Immersion depth 4″ (11cm) recommended

2 AAA Duracell MN2400
Up to 350 hours service life at 70°F (21°C)
Dependent on backlight usage
Operating Temperature Range -4°F to 130°F (-20°C to 54°C)
Note: Battery may not provide adequate power if used outside operating range.

Specifications subject to change, See data sheet for latest information.
Custom ranges, configurations and sensor lengths available upon request.

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