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Installing/Programming an Alarm Indicator
An LED Alarm Indicator can be mounted near the gauge being controlled. When activated, the
MeterMatch produces a flashing on/off signal to the LED to alert you to check the gauge. The circuit
will generate approximately 25mA across the LED. It is an open-collector output with 400
Ω
series
resistance.
LEDs typically have a longer lead for the anode (+), and shorter lead on the cathode (-) terminal.
Connect the LED cathode to Pin 5 of the terminal strip, and the LED anode to +12v switched, such as
Pin 1 of the MeterMatch.
It won't hurt anything if you accidently reverse the alarm wires, but the LED won't light.
Pin 5 terminal strip
LED negative (cathode)
+12V switched
LED positive (anode)
You can program the upper and lower alarm points with rotary switch
Ѳ
positions 5 and 6
respectively. Set the rotary switch
Ѳ
, use the Up/Dn buttons to set the desired gauge reading at
the set-point, then press Save. MeterMatch doesn't care what value the sender is at while
programming the alarm points - it is only interested in what you make the gauge read with the Up/Dn
buttons. As a result, ensure that you have calibrated your gauge accurately (rotary switch
Ѳ
positions 1-4), or your alarm will not be accurate either.
These points can also be erased using the same procedure as normal calibration points. Depending
on how your gauge works, you may find that the low and high alarm set-points are reversed in
operation from what you expect. If that's the case, simply reverse the calibration (use high for low
and vice-versa).
If you have more than one MeterMatch installed, you can logic "or" the LED signals so that if any of
the alarm signals become true, they will set off a single LED. Simply connect the LED negative
(cathode) in parallel to each MeterMatch (Pin 5).
Return Policy
If a MeterMatch unit does not work properly in your application, and is not damaged, Tanks, Inc. will
allow return for full refund of purchase cost, exclusive of any shipping charges. Claim for such must
occur within 30 days of product purchase from Tanks, Inc. Ship the unit back to Tanks, Inc. along
with a description of the problem and proof of purchase.
