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Series 820 Instruction Manual Chapter 4 Maintenance & Repair
IM-82-C 4-1
Chapter 4 Maintenance and Repair
Top-Trak
™
transducers essentially require no scheduled maintenance
other than periodic flow path cleaning if the gas is dirty. If an in-line
filter is used, the filtering element should be periodically replaced or
ultrasonically cleaned.
Calibration of Sierra Instruments flow meters and controllers re-
quires a calibrating standard of at least equal accuracy and preferably
an order of magnitude better than the transducer, and a skilled fac-
tory technician familiar with the Top-Trak. It is recommended that
Top-Trak meters be returned to the factory for annual evaluation and
calibration.
Included in this chapter are general instructions for:
• Transducer Cleaning Instructions..........................page 4-1
• Transducer Calibration......................................page 4-9
• Transducer Troubleshooting..............................page 4-11
• Returning Equipment to the Factory.....................page 4-12
Transducer Cleaning
Due to transducer design variations, separate cleaning instructions
are given in this chapter for each of the following models:
• Model 822/824 with nylon flow body
• Model 826/827 with aluminum flow body
• Model 822-S/824-S with stainless steel flow body
When toxic or corrosive gases are used, the transducer must be
thoroughly purged with inert dry gas before disconnecting from the
gas line. If a transducer used with toxic or corrosive gas is returned
to the factory, the transducer must first be purged clean. A Material
Safety Data Sheet must be enclosed with the unit upon its return.
Caution!
It is important that this
transducer be serviced
and/or calibrated by
qualified personnel.