Sierra 840 User Manual
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
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.
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.
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.
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..