Electronic Hygrostat
EFL 012

  • Large setting range
  • Compact design
  • Small hysteresis
  • Optical function display
  • Signal application

The electronic hygrostat is used for controlling heating and cooling equipment, filter fans or signal devices through the Relay DCM 010 or a similar device. The hygrostat registers the surrounding relative humidity and can switch a signal current via an internal relay with a potential free change-over contact. The LED integrated in the adjustment knob shows the closed status of the contact 1-2. When relative humidity drops contact 1-2 opens and the LED turns off. In currentless state (no supply voltage) contact 1-2 opens.

Switching difference5 %RH (± 3 %RH tolerance) at +77 °F (+25 °C) and 50 %RH
Reaction timeapprox. 5 sec.
Contact typeSPDT / change-over contact (relay)
Service life>100,000 cycles (at 10 mW)
Max. switching capacity (relay output)0.5 A at DC 48 V
Min. switching loadDDC 10 mW (at 0.1 V, 100 mA or 1 mA, 10 V)
Optical indicatorLED

5-pole terminal, clamping torque 0.5 Nm max.:
solid/stranded1 wire - AWG 14 max. (2.5 mm2)

Housingplastic, UL 94V-0, light grey
Mountingclip for 35mm DIN rail, EN 60715
Mounting positionvertical
Operating / Storage temperature+32 to +140 °F (0 to +60 °C) / -4 to +158 °F (-20 to +70 °C)
Operating / Storage humiditymax. 95 %RH (non-condensing)
Dimensions2.54 x 1.65 x 1.5" (64.5 x 42 x 38 mm)
Weightapprox. 2.5 oz. (70 g)
Protection typeIP20

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

Part No.Operating voltageSetting rangeApprovals
01245.2-00DC 12-48 V (min. DC 10 V, max. DC 60 V)40 to 90 %RHUL File No. E164102EAC

Technical Drawing

Electronic Hygrostat EFL 012