Maintenance 7828 Density Transmitter Technical Manual
6-2 78285000_AA
6.2 GENERAL MAINTENANCE
This procedure is recommended for periodic maintenance and can also be used when
fault finding.
6.2.1 PHYSICAL CHECKS
a. Examine the transmitter, its electronics housing and cables for any signs of damage
and corrosion.
b. Make sure that the spigot connection is tight.
c. Check the transmitter for sign of leakage.
d. Check that there is no ingress of water/fluid into the electronics housing.
e. Ensure that the threads on the covers are well greased (graphite grease) and that the
‘O’ rings are in good condition.
Note: The covers MUST be completely screwed down and, in the case of an explosion-
proof enclosure application, DO NOT FAIL to tighten the locking screws.
6.2.2 ELECTRICAL CHECK
Check the power supply and current consumption at the transmitter terminals, pins 1 and 2.
These should give:
35mA to 42mA at 22.8V to 25.2V
If the current consumption outside this range, contact Solartron.
6.2.3 CALIBRATION CHECK
a. Carry out a check calibration as detailed in Section 5.
b. Compare the results obtained with the previous calibration figures to identify any
substantial deterioration in transducer performance or any malfunction.
Notes: 1. A drop in transducer performance is likely due to a build up of deposition on
the tines which can be removed by the application of a suitable solvent.
See section 6.3.1 below.
2. Malfunctions generally could be the result of electrical/electronic faults in
either the transducer or the readout equipment. Always check the readout
equipment first before attention is directed to the transducer.
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