Testing The Installation - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

MAINTENANCE (continued)

Testing the installation:

1. Power: Turn on power to the controller and/or power supply.
2. Immersing the switch: Immerse the sensing tip in its application liquid, by filling the tank up to the
switches point of actuation. An alternate method of immersing the switch during preliminary testing is
to hold a cup filled with application liquid up to the switch's tip.
3. Test: With the switch being fluctuated between wet and dry states, the switch indicator light in the
controller should turn on and off. If the controller doesn't have an input indicator, use a voltmeter or
ammeter to ensure that the switch produces the correct signal (see below).
4. Point of actuation: Observe the point at which the rising or falling fluid level causes the switch to
change state, and adjust the installation of the switch if necessary.
Example: Testing the LU10 series with a Multimeter set to read current (mA). When wired NO [Red to (+)], the
meter will read 5mA, ±1mA when dry and will read 20mA, ±1mA when wet.
Example: Testing the LU10 series with a multimeter set to read resistance (ohms). When wired NO [Red to
(+)], the meter will read O.L when dry and will read some small amount of resistance (ex. 0.2 Ohms) when wet.
Rev A LO900002
Step Eight
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