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95 Series Operator’s Guide
4-6
71-0011 — REV E
Calibration (HS-95, CO-95)
Open the operator controls flap, and slide the power switch on
(toward the sensor). Allow a few seconds for the instrument to
stabilize.
1.
Make sure the instrument is in a fresh air environment, free
of H
2
S or CO gas. Press and hold the ZERO/- button. A low
bar is displayed to the left of the gas reading during the
automatic zero calibration. Release the button when the
PASS or FAIL message is displayed. The instrument returns
to normal mode, with the alarm inhibited for 2 minutes.
2.
Go to span calibration mode by pressing and releasing the
ZERO/- and SPAN/+ buttons at the same time. The letter C
appears. The value displayed is the current span calibration
setting. If necessary, press the ZERO/- or SPAN/+ button to
change the setting to match the concentration indicated on
the test gas cylinder.
3.
When the values match, return to normal mode by pressing
and releasing ZERO/- and SPAN/+ twice. The instrument
passes through set gas alarm (L & H) modes and set delay
(d) mode and enters normal mode.
4.
Fit the test cup into the groove around the sensor port with
the retainer arm around the back of the instrument holding
the cup in place. The fitting should extend to the right across
the top of the instrument.
5.
Open the flow control knob on the H
2
S cylinder regulator or
the CO cylinder dispensing valve. For the HS-95, verify that
the regulator gauge shows a pressure greater than 0. For a
CO-95, set the flow rate to 1.0 SCFH. Allow 90 seconds for
the reading to stabilize.
Содержание CO-95
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