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Series 820 Instruction Manual Chapter 4 Maintenance & Repair
IM-82-C 4-3
Laminar Flow Element
The laminar flow element (LFE) is a precision flow divider which
diverts a preset amount of flow through the sensor tube. The LFE is
made of precision machined 316 stainless steel. The particular LFE
used depends on the gas and flow range of the instrument. To clean
or inspect the LFE:
1. Remove the transducer from the system.
1. Remove the inlet and outlet fittings. Pull out the LFE holddowns
and inlet/outlet screens.
2. The LFE has a slightly tapered shape with the larger diameter on
the upstream (inlet) side. To remove, use a blunt object which
does not mar the flow channels to push the LFE from the outlet
side to the inlet side. A 3/8-inch (9 mm) nut driver works well.
3. Clean the LFE using a suitable solvent. Make sure to carefully
clean all active flow channels in the LFE.
4. Re-install the LFE making sure to press it in the correct distance
as shown below.
5. Re-assemble remaining components. When the transducer is in-
stalled in the system, leak test the connection. Re-zero the trans-
ducer (see Chapter 3).
Figure 4-2. Correct LFE Position
Caution!
When using toxic or cor-
rosive gases, purge the
unit thoroughly with inert
dry gas before disconnect-
ing from the gas line.