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TEL-TRU

TEL-TRU is a US-based manufacturer of temperature measurement instruments, with a product history dating back to the early 20th century. The company produces dial thermometers, digital thermometers, thermowells, and calibration accessories for industrial, commercial, and food-service applications. Its instruments are used to monitor and verify temperature in processes where accuracy and repeatability matter, such as HVAC systems, food processing, sanitary environments, and composting operations. TEL-TRU products are manufactured in the United States, and the country of origin is noted on applicable product listings.

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About TEL-TRU

TEL-TRU is a US-based manufacturer of temperature measurement instruments, with a product history dating back to the early 20th century. The company produces dial thermometers, digital thermometers, thermowells, and calibration accessories for industrial, commercial, and food-service applications. Its instruments are used to monitor and verify temperature in processes where accuracy and repeatability matter, such as HVAC systems, food processing, sanitary environments, and composting operations. TEL-TRU products are manufactured in the United States, and the country of origin is noted on applicable product listings.

The product families available through 3G Electric include general-purpose dial pocket thermometers, NSF-rated vat and pan clip-on dial thermometers, sanitary clamp thermowells, and specialty dial thermometers for compost monitoring. These instruments cover a range of measurement scales in both Fahrenheit and Celsius, with many models offering +/- 1% accuracy. Stem lengths vary by model, with common options including 8-inch, 12-inch, and 24-inch configurations. Thermowells are available in stainless steel with sanitary clamp connections, designed to accommodate specific stem lengths and diameters. For example, one sanitary clamp thermowell supports a 4-inch stem length, 2-inch insertion length, and 1/4-inch stem diameter, with a maximum operating pressure of 5000 psi and a maximum operating temperature of 1000 °F.

Technical buyers selecting TEL-TRU instruments should consider the measurement range, stem length, connection type, and whether the application requires NSF-rated construction for food-contact surfaces. Dial thermometers in the line include models with ranges such as 0°F to 250°F, 25°F to 125°F, 50°F to 500°F, -40°F to 160°F, and 0°F to 220°F, as well as Celsius equivalents like 0°C to 50°C. The compost thermometer model includes a wireless display and measures from -67°F to 302°F, intended for tracking internal pile temperatures. Thermowells are specified by stem length, insertion length, and stem diameter to match the thermometer or sensor being installed. 3G Electric supplies TEL-TRU instruments globally, supporting procurement for maintenance, operations, and project teams that require documented specifications and consistent part numbers. The catalog includes manufacturer part numbers and UNSPSC codes to assist with identification and cross-referencing. For buyers integrating temperature measurement into sanitary processes, food-service equipment, or general industrial monitoring, the TEL-TRU line offers a range of dial and digital options with defined accuracy and range specifications.

Common Applications

  • Food service — NSF-rated vat and pan clip-on dial thermometers (SKUs 9PWD3, 9RTU5, 8A268, 8A270, 8ACU2) for monitoring cooking and holding temperatures.
  • HVAC — General purpose dial pocket thermometer (SKU 460V31) with 24-inch stem for duct and ambient temperature checks.
  • Sanitary processing — Stainless steel sanitary clamp thermowell (SKU 905P86) for hygienic sensor installation in process lines.
  • Composting — Dial thermometer with wireless display (SKU 844LA4) for tracking internal pile temperatures and decomposition.
  • Laboratory — NSF-rated clip-on dial thermometers with ranges such as 50°F to 500°F for sample and bath monitoring.
  • Industrial process — Dial thermometers with +/- 1% accuracy for general temperature indication in manufacturing and utilities.

Frequently asked questions

Common questions about TEL-TRU from 3G Electric.

What stem lengths are available for TEL-TRU dial thermometers?

TEL-TRU dial thermometers supplied by 3G Electric include stem lengths of 8 inches, 12 inches, and 24 inches, depending on the model. For example, the general purpose dial pocket thermometer (SKU 460V31) has a 24-inch stem, while several NSF-rated vat and pan clip-on models (SKUs 9RTU5, 8ACU2) use an 8-inch stem. Other clip-on models (SKUs 9PWD3, 8A268, 8A270) feature a 12-inch stem. Stem length selection depends on the depth of the vessel or process being monitored and the required immersion depth for accurate reading.

Are TEL-TRU thermometers suitable for food-service applications?

Several TEL-TRU dial thermometers in the 3G Electric catalog are NSF-rated for food-contact surfaces, including vat and pan clip-on models. These instruments are designed for monitoring temperatures in food-service, laboratory, and industrial settings. Models cover ranges such as 25°F to 125°F, 50°F to 500°F, -40°F to 160°F, and 0°F to 220°F, with +/- 1% accuracy. The clip-on design allows attachment to vats and pans for continuous temperature monitoring during processing or holding.

What are the specifications of TEL-TRU sanitary clamp thermowells?

The TEL-TRU sanitary clamp thermowell (SKU 905P86) is constructed from stainless steel and is designed for use with a 4-inch stem length, 2-inch insertion length, and 1/4-inch stem diameter. It supports a maximum operating pressure of 5000 psi and a maximum operating temperature of 1000 °F. This thermowell accommodates temperature sensors in hygienic process environments, providing a barrier between the sensor and the process fluid while allowing for sensor removal without system shutdown.

Does TEL-TRU offer a thermometer for composting operations?

Yes, the TEL-TRU dial thermometer for compost (SKU 844LA4, MPN RCPDF000) includes a wireless display and measures temperatures from -67°F to 302°F. It is intended for monitoring internal compost pile temperatures to track microbial activity and decomposition progress. The wireless display allows readings to be taken without direct contact with the pile, which can be useful for routine monitoring in composting facilities.

What accuracy do TEL-TRU dial thermometers provide?

Many TEL-TRU dial thermometers listed by 3G Electric are specified with +/- 1% accuracy. This applies to models such as the general purpose dial pocket thermometer (SKU 460V31), the NSF-rated vat and pan clip-on thermometers (SKUs 9PWD3, 9RTU5, 8A268, 8A270, 8ACU2), and others. Accuracy is expressed as a percentage of the full-scale range, so the actual tolerance in degrees depends on the specific model's measurement span. Buyers should verify the range and accuracy against their process requirements.

Can TEL-TRU thermometers measure in Celsius?

Yes, TEL-TRU offers models with Celsius scales. For example, the general purpose dial pocket thermometer (SKU 460V31) measures from -20°C to 120°C, and the NSF-rated vat and pan clip-on thermometer (SKU 8ACU2) measures from 0°C to 50°C. Other models in the 3G Electric catalog are specified in Fahrenheit. When ordering, confirm the temperature units required for your application to ensure the correct model is selected.