Flowline LD30 DeltaSpan - Manual (Page 13)

Rev B MN301030 13 of 14
MAINTENANCE Step Ten
Maintenance should consist of inspection to see that the transmitter is free from debris and not coated with
any substance, which would prevent liquid from freely entering and leaving the transmitter. If this occurs, the
transmitter should be cleaned.
Cleaning procedure:
1. Power: Make sure that all power to the transmitter, controller and/or power supply is completely
disconnected.
2. Transmitter removal: If necessary, make sure that the tank is drained well below the switch prior to
removal. Carefully, remove the transmitter from the installation.
3. Cleaning the switch: Using a soft bristle brush and mild detergent, carefully wash the switch. Do not
use harsh abrasives such as steel wool or sandpaper, which might damage the surface of the sensor.
Do not use incompatible solvents, which may damage the sensor's stainless steel body. Take particular
care to remove any scaling from the body and that there is no debris inside the inlet.
Transmitter installation: Follow the appropriate steps of installation as outlined in the Installation section of
this manual.
Testing the transmitter:
 First, verify that the sensor is wired correctly.
 Next, check if the power supply is providing the required power.
 Finally confirm that the loop resistance is not exceeding the sensor’s specification.
If transmitter is not functioning properly, isolate the transmitter from the system and wire as shown below.
Be sure to remove the sensor from the classified area when performing this test. Multimeter should read 4
mA with the transmitter out of liquid.