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The CM2M-K is a current monitor designed for use with Medem ventilation interlock systems.

Each CM2M-K can be used to interlock 2 fans, the fans are connected by taking the live feed for each fan through the current monitor (before any speed controllers/inverters).

Fan load sensitivity range on each fan is 30 milliamps to 24 amps.(max).

There are 3 LED indications,
1x Green, for the 12 volt power to the CM2M-K
2x Red, one for fan A and another for Fan B load detection.

When the fans are switched on and the load is detected (installation instructions) the corresponding side’s NO/NC contact will close and the red LED will light, this will flash for the first 15 minutes after current detection and then become solid. The flashing LED helps us to identify a fan intermittently stalling.

  • CM2M-K

Design & Specification Documents

  • 5 Year Warranty

    5 Year Warranty

    Medem’s industry leading five-year warranty is a demonstration of the company’s confidence in the quality and design of our products.

    This applies to the main panels and sender units, gas detectors carry a two year warranty.

    Where we commission an installed system the warranty is extended from five to ten years. At the time of commissioning photos and gas pressure readings are recorded along with other relevent details of the installation. A 24 hour help line number and serial number is attached with the panel and all details are then entered on to the Medem database.

    5 & 10 year warrenty

  • Fan interlocking

    Fan interlocking

    Fan interlocking is used where you require isolation of the gas supply when the ventilation is not running.

    In commercial kitchens it is a requirement to meet current regulations BS6173, BB100, UP11 (see our standards section for more information).

    Our recommended method of interlocking is “current monitoring” (see our model CM2M-K)


IGEM/UP/19 Edition 1, Design and application of interlock devices...

IGEM/UP/19 Edition 1, Design and application of interlock devices...

IGEM/UP/19 Edition 1, Design and application of interlock devices and associated systems used in with gas appliance installations in commercial catering establishments

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