ThermoProbe TP7-D Portable Petroleum Gauging Thermometer – Spool Design

The TP7-D is a Zone 0 intrinsically safe digital gauging thermometer re-designed to the latest standards for use in hazardous locations. With over 30 years experience manufacturing digital thermometers, ThermoProbe has designed the TP7-D with reliable RTD sensors based on our previous industry-standard thermometers such as the TP7-C and TP9.

Based on our laboratory thermometer technology, the latest TP7-D electronics are more accurate than previous models. The convenient user interface provides a large 1/2” alpha-numeric character display and buttons that can be easily used with gloves. An automatic backlight feature is included to help read the display in low light conditions. An intuitive menu allows the user to easily select Celsius or Fahrenheit units, display resolution, and access calibration. Icons on the display help the user identify temperature stability, battery condition and menu items. The TP7-D comes equipped with easily replaceable AA batteries, providing up to 200 hours of operation.

The TP7-D rugged instrument body is constructed from stainless steel and static-dissipative plastic components. The TP7-D spool-reel design allows the user to quickly deploy and retrieve the sensor probe into various products. With multiple probe configurations and allowable lengths up to 50 meters (165 ft), the TP7-D is well suited to many tank gauging applications. The probe assembly is constructed of easy to clean materials such as non-stick cable and stainless steel.

Data Sheet



  • Resolution: 0.01 Degrees
  • Range: -40°F to 400°F (-40°C to 204°C) Note: Standard Calibration does not provide full range accuracy
  • Calibrated Accuracy:
    ±0.2°F from 32 to 200°F (±0.1°C from 0 to 100°C)
    ±0.5°F from 200 to 400°F (±0.3°C from 100 to 200°C)
  • Custom calibration points and ranges available.
  • 4 Point NIST Traceable Report of Test
  • Long-term drift not to exceed 0.05%/year
  • Meets API requirements

Interface Features:

  • 1/2″ (13mm) character LCD
  • Switchable units °C or °F
  • Resolution 0.1 or 0.01
  • Low Battery & Fault Indication
  • Calibration adjustment through faceplate buttons.
  • Auto Off after 20 minutes.
  • Stores and displays up to 10 Logged readings, Average, Lowest & Highest readings.
  • Arrows indicating increasing/decreasing temperature.


  • Probe: 304 Stainless Steel, Sealant, Coaxial cable with Aramid Fiber & PFA Cable Jacket
  • Enclosure: Stainless Steel, Rugged panel mount buttons, Static Dissipative Plastic Handle
  • Nominal Body Dimensions: 12”L x 7”H x 5.5” W (30.5 x 17.8 x 14cm)
  • Nominal Weight: 4.5lb (2.0kg) with 75′ standard weight probe assembly

Probe Assemblies:

Thermoprobe gauging thermometers come equipped with probe assemblies consisting of a length of non-stick 2-wire cable and a stainless steel weighted RTD temperature sensor. Indelible brass markings are applied to the cable to aid in tank depth determination. The Probe Assembly part numbers are specified as follows:

Probe Part Number

Example: Our most standard PG-075-SW-SM probe assembly is 75 feet long (075) with a Standard Weight (SW) and brass markings every 5 feet (SM). Various configurations are available.

Probe Weight Details and Dimensions

Standard Weight: 0.25 lb (0.11 Kg) This reliable design is our most popular probe.

Extra Weight: 0.50 lb (0.23 Kg) This design has the same diameter as the Standard Weight but is slightly longer and heavier.

Railcar Weight / No Weight: The Railcar probe is produced as a specialty probe for the railcar industry specifically for small diameter gauging tubes fitted in many tanker cars.

Asphalt Weight: 0.75 lb (0.34 Kg) The probe of choice when working with liquid asphalt, molten sulfur, molasses, or similar high-viscosity petrochemicals.