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Series 830/840/860 Instruction Manual Chapter 4 Maintenance
IM-83/84/86-H 4-5
Figure 4-4. NPT Transducer LFE Cleaning
NPT-Type Transducers:
The NPT flow body is comprised of a stainless steel pipe termi-
nated on either end by an end cap sealed with an O-ring. The end
caps are held in place by four tie rods which run the length of the
flow meter and are fastened with eight 3/8-16 nuts and washers.
The inlet screen is mounted to the inside of the inlet end cap on
three standoffs. The LFE is a cylindrical honeycomb element lo-
cated in the flow body between the two sensing ports. In most
cases, the LFE can be cleaned without removing it from the flow
body. If it cannot be cleaned by back washing, return for factory
service. To access the components:
1. Remove the unit from the system.
2. To remove the inlet filter screen, stand the flow body on end
with the inlet facing up and remove the four 3/8-16 nuts on the
ends of the tie rods. Carefully lift the end cap and filter screen
assembly up and off the meter.
3. Inspect the inlet screen for damage and corrosion and replace if
necessary. Light to medium particulate contamination can be
cleaned by back washing with a suitable solvent. Air dry thor-
oughly before re-assembly. Mount the inlet screen with the fine
mesh side facing the inlet.
4. Inspect the sealing O-ring for damage and replace if necessary.
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..