Sierra 840 User Manual
Series 830/840/860 Instruction Manual
Chapter 4 Maintenance
IM-83/84/86-H
4-3
Figure 4-2. Medium Flow Transducer LFE Cleaning
Medium Flow Transducers:
In the medium flow body, the LFE assembly consists of the honey-
comb laminar flow element, inlet screen, 0.63 inch long standoff,
two ranging washers, 2-1/4 inch long 4-40 screw and 4-40 nut.
Range changes in the honeycomb element are made with various
diameter ranging washers. To access the components:
7. Remove the unit from the system.
8. Access the LFE by unscrewing the four 10-32 socket head cap
In the medium flow body, the LFE assembly consists of the honey-
comb laminar flow element, inlet screen, 0.63 inch long standoff,
two ranging washers, 2-1/4 inch long 4-40 screw and 4-40 nut.
Range changes in the honeycomb element are made with various
diameter ranging washers. To access the components:
7. Remove the unit from the system.
8. Access the LFE by unscrewing the four 10-32 socket head cap
screws from the inlet side of the flow body and remove the in-
let end cap.
let end cap.
9. 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.
10. Inspect the honeycomb element for damage and replace if nec-
essary. Replacement of the LFE or inlet screen requires trans-
ducer re-calibration.
ducer re-calibration.
11. Re-assemble components. When the transducer is re-installed
in the system, leak test the connection.
12. Check transducer calibration.