8500 Spot Temperature Sensor

8500 Spot Temperature Sensor

Calculate accurate inventory volumes by integrating temperature measurement into your tank gauging system. Product temperature is used for volumetric calculation to a reference temperature and is of significant importance in the accurate calculation of liquid inventories in bulk storage tanks.


  • Overview
  • Specifications
  • Options
  • Resources
  • Related Products

Tank Gauge System

The 8500 Spot Temperature Sensor (STS) connects to the Varec float and tape transmitters, servo tank gauge or tankside monitor to provide spot temperature measurement for use in accurate inventory volume calculations.




Suitable for Many Applications

The 8500 STS provides many options to suit your applications, including probe lengths from 18″ to 48″ (46 to 122 cm), flanged models for 150 psig (1 MPa) and 300 psig (2 MPa) service, as well as HART, 4‐20mA, Profibus or Foundation Fieldbus communications protocols for integration with tank gauges or monitors.





Resistance Bulb

Platinum (DIN 385) 100 Ohms at 32 °F (0 °C)

Probe Lengths

18” (45.7 cm)
24″ (61 cm)
36” (91.4 cm)
48” (122 cm)

316SS Thermowell Process Connection
  • ¾” male NPT
  • 1” male NPT, 36” length (other lengths available upon request)
  • 1½” 150 lb ANSI/ASME RF flange
  • 1½” 300 lb ANSI/ASME RF flange

All thermowells have a ½” female NPT connection for RTD probes.
The bore on all thermowells is 0.260” for ¼” diameter probes.
Thermowells are available in different material types upon request.
Other thermowell flange sizes and ratings available upon request.

Thermowell Custom Additional Options
  • Wake Frequency Calculation
  • Hydrostatic Test
  • Full Penetration Welds
  • NACE Certified
  • Material Certificates
  • Positive Material Identification (PMI)
  • Plug & Chain; 304SS, 316SS, Brass
  • Ra 20 max Special Surface Finish
  • Coatings; Tantalum/ Halar, PFA, PTFE, Tungsten Carbide
  • Custom Stamping
Measuring Temperature Range (inside the tank)

Higher range ‐328 to 1100 °F (‐200 to 593 °C) available upon request

Operating Temperature Range (outside the tank)

‐40 °F and +185 °F (‐40 °C and +85 °C)

Enclosure Approvals

Rated IP65 (NEMA 4)
FM / FMC Approval: Class I, Div 1, Groups A,B,C,D Class II, Div 1, Groups E,F,G

For complete technical specifications, download the technical document.

01 Connection Type
  • ¾” male NPT
  • 1” male NPT, 36” length (other lengths available upon request)
  • 1½” 150 lb ANSI/ASME RF flange
  • 1½” 300 lb ANSI/ASME RF flange
  • Special Version (Contact Factory)
02 Probe Length
  • 18″ (45.7 cm)
  • 24″ (61 cm)
  • 36″ (91.4 cm)
  • 48″ (122 cm)
  • Special Version (Contact Factory)
03 Element Type
  • 100 Ohm Platinum DIN385 Element, -328°F to 1100°F (-200°C to 593°C)
  • 100 Ohm Platinum DIN385 Element, -328°F to 1100°F (-200°C to 593°C), in-head HART transmitter
  • Special Version (Contact Factory)

Technical Specifications

8500 Spot Temperature Sensor Technical Specifications
Technical specifications for the Varec Model 8500 Spot Temperature Sensor.


Tank Gauging Products for Bulk Liquid Storage Tanks
Simple, safe and reliable inventory measurement using float and tape, servo, radar, transmitters, and other tank gauging equipment and accessories.
Inventory Control Solutions
Integrate Field Instruments and Software for Complete Asset Management
Cookie Settings