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Chapter 4 Maintenance Series 830/840/860 Instruction Manual
4-2 IM-83/84/86-H
Figure 4-1. Low Flow Transducer LFE Cleaning
Low Flow Transducers:
The LFE is accessed by unscrewing the main inlet fitting and re-
moving it from the flow body. The LFE is screwed into the inlet
fitting, which has been specially machined for this purpose. To ac-
cess the components:
1. Remove the unit from the system.
2. The inlet filter screen is held in place in the inlet fitting by the
LFE. Disassemble by holding the fitting steady with a wrench
and unscrewing the LFE with a medium flat-tipped screw-
driver.
3. Remove the LFE assembly taking care not to bend the inlet
screen. Inspect the sealing O-ring and replace if necessary. In-
spect the inlet screen and replace if corroded or damaged. Light
to medium particulate contamination can be cleaned by back
washing with a suitable solvent. Air dry thoroughly.
4. Inspect the LFE for damage and replace if necessary. Replace-
ment of the LFE or inlet screen requires transducer re-
calibration.
5. Re-assemble components. When the transducer is re-installed
in the system, leak test the connection.
6. Check transducer calibration.
Caution!
Removing or re-
positioning the LFE may
alter the calibration..