Electronic Hygrotherm with external sensor
ETF 012

  • Efficient temperature & humidity control
  • Wide voltage range
  • Operating temperature down to -40 °C
  • High switching capacity
  • With external sensor

The ETF 012 senses the ambient temperature and relative humidity in an enclosure. Depending on which contact combination is chosen, it then turns on or off a connected device if either the temperature is below or the humidity is above the set point. The integrated LED in each adjustment knob i lit when indicating the active function.

The external sensor can be positioned freely anywhere in the enclosure for precise measurements.

Switching difference (temperature)2 K (±1 K tolerance) at +25 °C (+77 °F), 50 %RH
Switching 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)10 A resistive / 1.6 A inductive @ AC 240 V
0.6 A @ DC 60 V¹
Max. inrush currentAC 30 A for 10 sec.
Connection5-pole terminal, clamping torque 0.5 Nm max.:
solid/stranded² wire - AWG 14 max. (2.5 mm²)
Housingplastic, UL 94V-0, light grey
Mountingclip for 35 mm DIN rail, EN 60715
Mounting positionvertical
Operating/Storage temperature-40 to +140 °F (-40 to +60 °C)
Operating/Storage humiditymax. 90 %RH (non-condensing)
Dimensions3.0 x 2.4 x 1.7" (77 x 60 x 43 mm)
Weightapprox. 3.5 oz. (100 g)
Protection typeIP20
ApprovalsUL File No. E164102, VDE, EAC

¹ not UL confirmed

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

Part No. Cable - 1 mPart no. Cable - 2 mOperating voltageSetting range - temperatureSetting range - humidity
01231.0-0001231.0-01AC 100-240 V, 50/60 Hz (min. AC 90 V, max. AC 265 V)0 to +60 °C50 to 90 %RH
01231.9-0001231.9-01AC 100-240 V, 50/60 Hz (min. AC 90 V, max. AC 265 V)+32 to +140 °F50 to 90 %RH
01231.1-0001231.1-01DC 24-48 V (min. DC 20 V, max. DC 60 V)0 to +60 °C50 to 90 %RH

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Dimensioned Drawing

Electronic Hygrotherm with external sensor ETF 012

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