LG 113 RESOURCES
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- Maintenance Checklists:
UST Program - LG 113 - ATG Maintence Checklist/Magnetostrictive and Ultrasonic Probes
Magnetostrictive and Ultrasonic Probes | ||||||||||||||||||
Minimum procedures to be conducted by a qualified service technician. | ||||||||||||||||||
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Comments:
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- Damaged probes must be cleaned or replaced as appropriate.
Probes used in heavier products such as waste oil should
be checked more frequently. Heavier products can leave
deposits on the probe shaft and float assemblies that
may restrict the measurement capacity of the probe.
- Because the magnetostrictive probe consists of moving
parts, its sensors can be damaged by
excessive frictional wear as well as residue build-up.
Residue build-up can affect the weight of the sensor
as well as inhibit its ability to slide freely along
the guide tube. Inaccuracies in the product level measurements
could indicate a problem with the probe sensors. For
additional testing of the probe sensors, perform the
following test:
- Remove the probe from the tank and place it carefully on the ground
- Place the water sensor flush with the bottom of the probe shaft and place the product float near the middle of the probe shaft.
- Check the height reading on the tank gauge monitor
(after allowing sufficient time for the monitor to
respond). Measure the distance from the bottom
of the probe to the bottom of the product float
and compare it with the reading on the monitor.
- To test the accuracy of the product sensor:
- Using the tank console monitor, take an initial fuel level reading.
- Dispense one gallon of product into a calibrated container.
- Using the tank console monitor, take a second fuel level reading.
- Verify that the change in tank volume is one gallon.
- To test the accuracy of the water sensor:
- Remove probe from the tank.
- By hand, move the water float up the probe to a point higher than the high-water alarm set point.
- The monitor should respond with a high water alarm report. (The water height may also appear on the tank monitor display console
- Check this height against its actual location. The high water level alarm should not be set so high that water ingress into the tank goes undetected for long periods of time
This checklist is not intended to tell the technician how to perform the maintenance and system check. Technicians should follow manufacturers' detailed instructions while making sure that all of the items on the checklist have been covered.