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ATC Semitec FRP3 HVAC Immersion Sensor

Gas-boiler style sensor with 1/8″BSP gas thread and integral connector, which are commonly used as HVAC immersion temperature sensors.

Available in brass or nickel-plated with a time constant (Tc) of around 5s typically


  • Gas boilers
  • Heating and air conditioning systems
  • Instant water heaters
  • Compressors


  • Fast response design (Tc ≤ 5s)
  • Accuracy ±1%, available ±0.2K (0-70°C)
  • Operating range up to -40°C/ +125°C
  • Interchangeability between NTCs
  • Excellent long-term stability

Technical Specifications

NTC Thermistor Series AT-2, ATC3, ET, GT, ATCS, SP
Temperature Range -40°C/+125°C depending on NTC
Sensor Accuracy R25±3% as standard, ±1% available
Sensor Material Nickel-plated brass, brass, stainless steel
Lead Wires Integral as a special option
Connectors Lumberg 2.5 MSF, Tyco Modu, etc