Mechanical Hygrostat

MFR 012 Mechanical Hygrostat

The MFR 012 electromechanical Mechanical Hygrostat is designed to control the relative humidity inside enclosures. When connected to an enclosure heater (dehumidifier), it will energize the heater at the humidity set point in order to raise the dew point. This helps prevent damage and malfunction of electronic components caused by condensation and corrosion.¹

The MFR 012 can also be used to control cooling fans, warning lights or other devices.

¹ The critical relative humidity level for most components is 65%. Above 65% RH, condensation can form and cause malfunctions of electronic equipment. Long term, this can lead to corrosion and permanent damage of electronic components and systems.

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Features

  • Adjustable temperature
  • High switching capacity
  • Small hysteresis
  • Change-over contact
  • Clip fixing

Specification

Switching difference 4 %RH (± 3 % tolerance) – at 50 %RH
Permissible air velocity 50 ft/sec (15 m/s)
Contact type SPDT / change-over contact
Service life > 50,000 cycles
Min. Switching capacity 100 mA @ AC/DC 20 V
Max. Switching capacity 5 A resistive @ AC 250 V
DC 20 W
Connection 3-pole terminal, clamping torque 0.5 Nm max.:
solid wire – AWG 14 max. (2.5 mm²)
stranded wire² – AWG 16 max. (1.5 mm²)
Housing plastic, UL 94V-0, light grey
Mounting clip for 35 mm DIN rail, EN 60715
Mounting position variable
Operating / Storage temperature +32 to +140 °F (0 to +60 °C) / -40 to +140 °F (-40 to +60 °C)
Operating / Storage humidity max. 95 %RH (non-condensing)
Dimensions 2.64 x 1.97 x 1.5” (67 x 50 x 38 mm)
Weight approx. 2 oz. (60 g)
Protection type IP20
Approvals UL File No. E164102, EAC

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

Part. No. Setting range
01220.0-00 35 to 95 %RH

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