Electronic Hygrotherm with external sensor
ETF 012

  • Temperature and humidity adjustable
  • Wide voltage range
  • Operating temperature down to -40°C
  • High switching capacity
  • With external sensor

The electronic hygrotherm senses the ambient temperature and relative humidity in an enclosure with electric/electronic components and turns on a heater (or alternatively a fan) at either set point, helping prevent the formation of condensation in the enclosure. Due to its wide voltage range the hygrotherm can be utilised anywhere in the world. The external sensor can be positioned freely anywhere in the enclosure for precise measurements.

Technical Data

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Switch difference (temperature)2K (±1K tolerance) at +25°C (+77°F), 50% RH
Switch difference (humidity)4% RH (±1% tolerance) at +25°C (+77°F), 50% RH
Reaction time (humidity)approx. 5 sec.
Contact typechange-over contact (relay)
Service lifeVDE: NO/NC > 15,000 cycles
UL: NO/NC > 30,000 cycles
Max. switching capacity (relay output)240VAC, 10 (1.6) A
60VDC, 0.6A¹
Max. inrush currentAC 30A for 10 sec.
Optical indicatorLED
Connection5-pole terminal, clamping torque 0.5Nm max.:
rigid/stranded² wire 2.5mm² (AWG 14)
Mountingclip for 35mm DIN rail, EN 60715
Casingplastic according to UL94 V-0, light grey
Dimensions77 x 60 x 43mm
Weightapprox. 0.2kg
Fitting positionvertical
Operating/Storage temperature-40 to +60°C (-40 to +140°F)
Operating/Storage humiditymax. 90% RH (non-condensing)
Protection typeIP20
ApprovalsVDE, UL File No. E164102, EAC

¹ not UL confirmed

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² When connecting with stranded wires, wire end ferrules must be used.

Art. No. Cable 1mArt. no. Cable 2mOperating voltageSetting range temperatureSetting range humidity
01231.0-0001231.0-01100-240VAC, 50/60Hz (min. 90VAC, max. 265VAC)0 to +60°C50 to 90% RH
01231.9-0001231.9-01100-240VAC, 50/60Hz (min. 90VAC, max. 265VAC)+32 to +140°F50 to 90% RH
01231.1-0001231.1-0124-48VDC (min. 20VDC, max. 60VDC)0 to +60°C50 to 90% RH

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Technical Drawing

Electronic Hygrotherm with external sensor ETF 012

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