Electronic Hygrostat
EFL 012 | 12 to 48 VDC

  • Large setting range
  • Small hysteresis
  • Optical operating display (LED)
  • Change-over contact
  • Signal application

The electronic hygrostat registers the surrounding relative humidity and can switch a signal current via its internal relay with a potential-free change-over contact. Signal-processing devices can be controlled directly with the EFL 012. In order to control heating and cooling equipment, filter fans and signal devices the switch module SM 010 or a similar device is needed. 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.

Technical Data

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Switch difference5% RH (±3% RH tolerance) at +25°C (+77°F), 50% RH
Reaction timeapprox. 5 sec.
Contact typechange-over contact (relay)
Service life>100.000 cycles (at 10mW)
Max. switching current (relay output)DC 0.5A at 48VDC
Min. switching capacityDC 10mW (at 0.1V, 100mA or 1mA, 10V)
Optical indicatorLED
Connection5-pole terminal, clamping torque 0.5Nm max.:
rigid wire/stranded wire1 2.5mm² (AWG 14)
Mountingclip for 35mm DIN rail, EN 60715
Casingplastic according to UL94 V-0, light grey
Dimensions64.5 x 42 x 38mm
Weightapprox. 70g
Fitting positionvertical
Operating/Storage temperature0 to +60°C (+32 to +140°F) / -20 to +70°C (-4 to +158°F)
Operating/Storage humiditymax. 90% RH (non-condensing)
Protection typeIP20

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

Art. No.Operating voltageSetting rangeApprovals
01245.2-0012-48VDC (min. 10VDC, max. 60VDC)40 to 90% RHUL File No. E164102EACVDE submitted

Technical Drawing

Electronic Hygrostat EFL 012