Sierra 840 User Manual
Series 830/840/860 Instruction Manual
Chapter 4 Maintenance
IM-83/84/86-H
4-1
Chapter 4 Maintenance
Side-Trak
™
and Auto-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 be replaced or ultrasonically cleaned. In-
cluded in this chapter are general instructions for:
the gas is dirty. If an in-line filter is used, the filtering element
should be periodically be replaced or ultrasonically cleaned. In-
cluded in this chapter are general instructions for:
• Flow Path Maintenance ...............page 4-1
• Sensor Maintenance.....................page 4-6
• Valve Maintenance......................page 4-8
• Valve Adjustment...................... page 4-12
• Transducer Calibration .............. page 4-15
Flow Path Maintenance
The transducer flow path is 316 stainless steel (wetted magnetic
parts of the solenoid valve are 430F stainless steel) with Viton
parts of the solenoid valve are 430F stainless steel) with Viton
®
Neoprene
®
or Kal-Rez
®
(or equivalent) seals, depending on the
gas used. The flow path should be periodically inspected and
cleaned as required.
When toxic or corrosive gases are used, purge unit thoroughly with
inert dry gas before disconnecting from the gas line. A transducer
used with toxic or corrosive gas must NOT be returned to the fac-
tory. Contact Technical Support for details.
cleaned as required.
When toxic or corrosive gases are used, purge unit thoroughly with
inert dry gas before disconnecting from the gas line. A transducer
used with toxic or corrosive gas must NOT be returned to the fac-
tory. Contact Technical Support for details.
Cleaning the 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 and
is identified by the number on the transducer nameplate. Should
the LFE require cleaning or inspection due to deposition, use the
appropriate cleaning procedure given on the following pages.
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 and
is identified by the number on the transducer nameplate. Should
the LFE require cleaning or inspection due to deposition, use the
appropriate cleaning procedure given on the following pages.
CAUTION! : REMOVING THE LFE WILL SHIFT THE
CALIBRATION OF THE INSTRUMENT. DO NOT REMOVE THE
LFE
UNLESS YOU PLAN ON RE-CALIBRATING THE TRANSDUCER.
Caution!
It is important that this
transducer be serviced
only by qualified personnel.
Caution!
Always fully neutralize
any toxic gas trapped in-
side the transducer
before removing from
the gas line.