40
Maintenance, Troubleshooting
Type 8700, 8701, 8703, 8705
4
5
7
3
2
1
6
1 - Screws
2 - Inlet flange plate
3 - O-ring
4 - O-ring
5 - Stainless steel mesh filter
6 - Orifice tube
7 - O-ring
Fig. 20: Maintenance, Cleaning
Procedure:
→ To gain access to the stainless steel mesh filter disc, detach the
input flange plate [2] (see Fig. 20).
→ Take out the stainless steel mesh filter disc.
→ Clean the stainless steel mesh filter disc [5] using distilled water
(not tap water), acetone, isopropanol or compressed air.
→ Dry the parts after cleaning.
→ Re-insert parts in the correct sequence and position
(see Fig. 20). The fine mesh of the filter disc [5] must face
the input flange plate [2].
9.2.2. Cleaning and recalibration at the
factory
If the sensor is excessively soiled or damaged by the operating gas, the
device may deviate significantly from the mass flow-rate measurement.
Cleaning or replacement followed by recalibration at the factory will
then be required.
note
• Recalibration must be carried out at the factory as it requires
the use of very precise references and a specific digital
communication system.
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