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Tuesday, October 1, 2013

Using a Manometer on a System Sensor D4120

A Manometer is an electronic device commonly referred to as a liquid column hydro-static instrument.  A Manometer measures pressure and vacuum within the actual System Sensor D4120 duct smoke detector.  Now they can be used with other manufacturer's duct detectors but for this example we will stick with the System Sensor D4120

Manometer Testing Duct Smoke DetectorThe Manometer we chose to use is very simple to operate.  It is manufactured by SDI.  Simply connect the two provided hoses with variable size end plugs and power it on.  Once on hold down the "hold" button for three seconds to zero out the machine.  Sort of like a scale.  Now press the "unit" button until you arrive at the selection of "inH2O" on the bottom left of the screen.

Now you will notice that the two hoses are connected to specific ports.  One is marked as negative and the other positive.  Make sure to place the hose end of the positive into the actual sample tube inlet.  The negative tube will go into the exhaust port. 

With the System Sensor D4120 duct detector you will be looking for a reading of anywhere between 0.01 min and 1.11 max.

I don't expect you will be coming across this very often as the mechanical contractor usually will install the duct mounted smoke detector therefor being responsible for testing it with a Manometer.  However, now if someone asks, you can say you know what a Manometer is.