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Connecting a Pulse to a Tehama Submersible MDT

This article will walk you through connecting a pulse to a Tehama Submersible MDT

Step 1: Install Device

  • Select a proper place for the location of the meter and the MDT. 
  • For pit meters, the MDT is designed to be mounted to the bottom of a plastic pit lid using screws through the two tabs, or with a waterproof adhesive.
  • Install the MDT device following appropriate local codes.

**The radio range and performance of the MDT will be optimal if it is mounted to the plastic pit lid and being upside down will keep the radio within an air pocket.

Step 2: Power Up Device

Power Supply

  • MDT Device is powered by an on-board battery

Step 3: Wire Device to Meter 

The MDT device requires 2 wire connections for its pulse inputs.  The MDT wires are colored to make those connections easier.

  • Black is the COM or ground.  This should be connected to the common or ground of the meter.
  • White is the Pulse Signal.  Connect this to the NC (normally closed) or NO (normally open) of the meter.

If it’s a reed-switch based water or gas meter, no polarity is required. 
If it’s a Badger Recordall, or most electric meters, then polarity of the wires is essential. 

You can always test the MDT by shorting the MDT’s black and white wires a few times. 

Short the wires together by tapping the exposed ends together.  Do this 5 times.   
Wave a magnet across the side of the case to send the readings to the DCAP. 
Use the CIT software to verify that the pulses are being incremented.

** By shorting the wires together, you are simulating a pulse count and the MDT is incrementing those pulse counts.  Using the CIT software verify that the pulses are being incremented.  Example:  Reading went from 1234 to 1239.

This would increment the pulse count, and they can use the magnet to immediately send a reading. 
Use the CIT or the phone app to verify.

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