CMS-1 CARBON MONOXIDE MONITOR
Page 9
© 2017 CLEMCO INDUSTRIES CORP.
www.clemcoindustries.com
Manual No. 23301, Rev. F
4.1.2 Calibration test:
Calibration test means
applying test gas of a known concentration to ensure the
instrument responds with an alarm when CO
concentrations exceed the permissible level, and that it
responds with a safe signal when impurity-free air is
applied. Calibration test does not include any adjustment
of the instrument. Calibration (adjustments) should be
done only when calibration testing shows it is necessary.
4.1.3 Calibration
process:
Calibration
means
adjusting the instrument. Calibration should be done
only when the instrument does not respond during
calibration testing, or remains in alarm at startup.
4.2
Stabilization Period
4.2.1
The monitor must be in operation for at least 30
minutes before calibration tests. DO NOT test the
instrument until it has gone through the warm-up period
and has been in operation with sample air flowing
through it (See Section 3.0) for at least 30 minutes.
4.3
Prepare Calibration Connector, Figure 6
4.3.1
Make sure the flow-control knob is turned fully
clockwise to the CLOSED position.
4.3.2
Thread the calibration connector onto the
cylinder of calibration gas.
Figure 6
4.4
Prepare Monitor for Calibration
4.4.1
Open the instrument case cover to access the
faceplate. Refer to Figure 7 for faceplate-calibration and
testing callouts.
4.4.2
Connect the tube end connector to the "Test
Gas" port by aligning the tabs and inserting the tube end
connector into the port, and turn it clockwise to lock.
4.4.3
Place the Run/Calibration toggle toward "CAL"
(calibration). The "ALARM" light will immediately turn
yellow
, and within a few seconds, the intermittent alarm
horn will sound. Disarming the alarm per Section 1.8.2
will silence the horn during calibration tests.
4.5
Calibration Test
4.5.1
Gently pull the tubing side of the release
connector (refer to Figure 6) to make sure it is correctly
seated in the body. Slowly open the calibration connector
valve to introduce test gas. Test gas is entering the unit
when the flow meter ball rises. If the ball does not rise
when the calibration valve is opened, the test gas cylinder
is probably empty.
4.5.2
Adjust the flow-control knob until the flow meter
ball remains between .5 and .8 SCFH. The valve is
extremely sensitive. Minor adjustments may be required
to correctly position the ball.
4.5.3
Allow test gas to flow through the instrument
until the digital readout stabilizes (about one minute).
4.5.4
If the display stabilizes between 9 PPM and 11
PPM (10 PPM plus or minus one), the calibration test is
complete. Return to operating mode per Section 4.7.
4.5.5
If the display stabilizes at any value other than
between 9 PPM to 11 PPM, and if the instrument has
been in operation for at least 30 minutes, calibrate the
instrument per Section 4.6. If the instrument has not
been in operation for 30 minutes, return it to operating
mode per Section 4.7, and operate with sample air for at
least 30 additional minutes. Re-test the calibration. If the
display stabilizes at a value other than 10 PPM plus or
minus one, calibrate the instrument per Section 4.6
4.5.6
When test/calibration is completed, return the
instrument to operating mode per Section 4.7.
4.6
Calibration
4.6.1
Do not calibrate the instrument unless it has gone
through two stabilizing periods and calibration tests, per
Sections 4.2 and 4.5, and only if the digital display is
other than 09, 10, or 11 (10 PPM plus or minus one).
Flow-Control Knob
Calibration Connector
Tube End Connector
Test Gas
OPEN
CLOSE
Slide Release
Push in to release
the tubing connector
