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Chapter 4 Maintenance & Repair Series 820 Instruction Manual
4-4 IM-82-C
Flow Path Cleaning Model 826/827
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 par-
ticular LFE used depends on the gas and flow range of the instru-
ment. To clean or inspect the LFE:
1. Remove the transducer from the system.
2. Remove the 6-32 hex nuts and washers. Remove the end caps.
Note the position of the three (3) LFE elements.
3. To remove the LFE, use a blunt object which does not mar the
flow channels to push the LFE from the flow body.
4. Clean the LFE using a suitable solvent. Make sure to carefully
clean all active flow channels in the LFE.
5. Re-install the LFE making sure to position it with both ends
even with the transducer flow body.
6. 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 4-3. Model 826/827 Flow Components
Caution!
When using toxic or cor-
rosive gases, purge the
unit thoroughly with inert
dry gas before disconnect-
ing from the gas line.