Dwyer TDS - Manual (Page 6)

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Step Nine
MAINTENANCE
General:
The TDS series flow switch requires no periodic maintenance except
to clean off any deposits or scaling from the sensor tip as necessary.
It is the responsibility of the user to determine the appropriate main-
tenance schedule, based on the specific characteristics of the applica-
tion liquids.
Cleaning Procedure:
1. Power: Make Sure that all power to the sensor, controller and/or
power supply is completely disconnected.
2. Sensor Removal: Make sure that the flow is off and the pres-
sure is down prior to removing the TDS series flow switch.
Carefully, remove the sensor from the installation. Replace the
sensor with a 3/4” NPT plug to insure that liquid does not leak out
during this procedure. Do not re-install the flow switch if the
threads are damaged.
3. Cleaning the Sensor: Use a soft bristle brush and mild deter-
gent, carefully wash the TDS series flow switch. Do not use harsh
abrasives such as steel wool or sandpaper, which might damage
the surface sensor. Do not use incompatible solvents which may
damage the sensor's PP/Ryton or PVDF plastic body.
4. Sensor Installation: Follow the appropriate steps of installa-
tion as outlined in the installation section of this manual.
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 applica-
tion liquid, by filling the tank up to the switches point of actua-
tion. An alternate method of immersing the switch during prelim-
inary 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 volt-
meter or ammeter to ensure that the switch produces the correct
signal.
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.