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Drawing number: 21089
Revision: NR
OPERATION MANUAL FOR
MODELS 122A, 122A21, 122A22, and 122A24
HELIUM BLEED PRESSURE SENSOR
4
6.0 GROUND ISOLATION
All sensor probes in this series are mounted in an
"OFF GROUND" configuration. That is, the probe
body is electrically insulated from the sensor outer
body to avoid ground loops.
7.0 MAINTENANCE AND REPAIR
The sealed construction and miniature size of these
sensors make field repair impractical.
The helium filter element should be cleaned should
the flow rate decrease. Remove the element and
ultrasonically agitate in solvent for 15 minutes, then
dry.
Should the orifice become plugged, back pressure the
orifice by applying air pressure to diaphragm end of
sensor with filter off and helium tube vented to
atmosphere.
The only maintenance possible on the probe is
maintaining of insulation resistance of the Model
122A probe/cable assembly. Clean connectors with
suitable solvent and dry.
Contact factory for assistance should problems
arise.
ICP is a registered trademark of PCB Piezotronics