Capillary Thermostat exTHERM-AT

−40°C
+70°C

Features

  • Can be directly applied in ex-hazardous areas zones 1 (21) and 2 (22)
  • Switching capacity 25A
  • Maintenance free terminal clamps
Product Datasheet

Application Areas

  • Electric trace heating
  • Monitoring and controlling of thermal processes
  • Freeze protection and temperature maintenance of pipelines and vessels in non-hazardous and ex-hazardous areas

Approvals

The explosion-proof surface-mounted thermostats of the exTHERM series are built to monitor and control temperatures in potentially ex-hazardous areas. The use in environments with gas and steam (zones 1 and 2); as well with conductive dust (zones 21 and 22) is permitted.

The exTHERM-AT is available as safety temperature monitor (STW). The thermostats work according to the liquid expansion or gas expansion principle. The electrical switching element is a pressure-resistant encapsulated thermostat with a snap-action switch. Stable switching points when ambient temperatures fluctuate are made possible by the standard ambient temperature compensation. If the temperature on the temperature probe exceeds the setpoint value, the microswitch is activated by the transmission mechanics and the electrical circuit is opened or closed. If the temperature falls below the selected setpoint value (by the amount of the switching differential), the microswitch is reset to its initial position. If the measuring system is destroyed (i.e. if the expansion fluid escapes) the pressure in the membrane of the STW drops and permanently opens the electrical circuit. Unlocking is then no longer possible.

  • Can be directly applied in ex-hazardous areas zones 1 (21) and 2 (22)
  • Switching capacity 25A
  • Maintenance free terminal clamps
  • Status signal contact
  • Approvals according to ATEX, IEC-Ex
Technical Data
Control temperature range −20 ... +50 °C
0 ... +190 °C
Max. switching capacity: contact deck 1-2
AC 230 V +10 %, 25 (4) A, cos φ = 1 (0.6)
contact deck 1-4
AC 230 V + 10 %, 6.3 (2.5) A, cos φ = 1 (0.6)
Hysteresis Approx. 7 %
Degree of protection IP65
Weight Approx. 1200 g
Cable entry:
Ex cable gland M20×1.5
Ex cable gland M25×1.5
sealing area 6 to 13 mm
sealing area 7 to 17 mm
Ambient temperature range −40 ... +40 °C, T6 (+70 °C, T4)
Capillary length 1000 mm
Capillary diameter 6 mm
Capillary material Stainless steel (CrNi)
Dimension:
Without cable glands
Incl. cable glands
122×120×90 mm
159×154×90 mm
Installation type Surface mounted