Part 2: CMS-4 Setup Guide

Watch how to set up and begin operating Clemco's CMS-4 Carbon-Monoxide Monitor-Alarm. This is the second of two videos. The CMS-4 attaches inside the helmets of supplied-air respirators, which enables blast operators to self-monitor their CO exposure. It triggers audible, visual, and vibratory alarms if CO is detected in concentrations of at least 10 ppm. Clemco is the world's largest manufacturer of air-powered abrasive blasting equipment, including abrasive blast machines, blast cabinets, blast rooms, safety equipment and blasting accessories.

CMS-4 Carbon Monoxide Monitor-Alarm Setup Guide: Part 2

Clemco’s CMS-4 Carbon Monoxide Monitor-Alarm detects carbon monoxide in the breathing-air supply of supplied-air respirators. It attaches inside the helmet of a supplied-air respirator and triggers audible, visual, and vibratory alarms when carbon monoxide is detected in concentrations of 10 parts per million or higher.

This two-part video series shows how to operate the most commonly needed CMS-4 functions. This second video covers:

    • Assembling the Calibration Connector Assembly
    • Calibrating the CMS-4 Monitor-Alarm
    • Performing a Bump Test

Please note that this video is not a replacement for reading the CMS-4 Operations Manual, which should be read in full by anyone who uses the monitor.

CMS-4 CO Monitor-Alarm: Calibration Connector Assembly

Assembling the Calibration Connector Assembly

  1. You will need the following material:
    1. 5 LPM fixed-flow calibration connector with slide valve
    2. 3/16-inch OD calibration tubing
    3. Calibration cup
  2. Slide one end of the 3/16-inc” tubing onto the barbed end of the calibration connector with slide valve.
  3. Slide the other end of the 3/16-inch tubing onto the inlet barb of the calibration cup.
    1. NOTE: The calibration cup has directional flow. The flow-direction arrow shows the direction of air flow. The tubing connects to the barb on the backend of the flow arrow. The outlet barb (on the front end of the flow arrow) remains open.

Calibrating the CMS-4 Monitor-Alarm

  1. You will need a 25 ppm carbon-monoxide test-gas cylinder and calibration connector assembly.
  2. Perform a fresh-air adjustment, as was outlined in Video 1.
  3. Once the fresh-air adjustment is completed, confirm the calibration connector’s slide valve is closed by sliding it down, toward the test-gas cylinder connection.
  4. Screw the calibration connector onto the test-gas
  5. Turn off the monitor by pressing and holding the POWER/MODE button. The monitor turns off after 4 beeps. Release the POWER/MODE button after the monitor’s screen goes blank.
  6. Press and hold the AIR and POWER/MODE buttons. Release the buttons after the monitor beeps 1 time. The monitor beeps again, and BUMP displays in the bottom left of the screen.
  7. Press the AIR button once, and GAS CAL displays at the bottom of the screen.
  8. Press the POWER/MODE button once, and AIR displays in the bottom left of the screen.
  9. Press the AIR button once, and A-CAL displays in the bottom left of the screen.
    1. NOTE: If E-CAL displays instead of A-CAL, the monitor is in the incorrect mode. See the operations manual.
  10. Next, press the POWER/MODE button once; the calibration value displays on the right side of the screen.
  11. Press the POWER/MODE button once, and the gas reading starts to flash.
  12. Snap the calibration cup to the front of the monitor over the sensor retainer. (The sensor retainer is located to the right of the screen.) The arrow embedded in the calibration cup must point up and to the left.
  13. Open the connector’s slide valve by sliding it up, to the open position.
  14. Allow gas to flow for 1 minute. After 1 minute, press the POWER/MODE button. The monitor begins to calibrate.
  15. If the calibration fails, FAIL displays at the bottom of the screen. Refer to the operations manual.
  16. If the calibration was successful, PASS briefly displays at the top of the screen.
  17. Close the connector slide valve by sliding it down, remove the calibration cup from the monitor, and unscrew the calibration connector from the test-gas cylinder.
  18. Press the Air button once, and ESCAPE displays at the bottom of the screen.
  19. Press the POWER/MODE button once, and GAS CAL displays at the bottom of the screen.
  20. Press the Air button 13 times, and START displays at the bottom of the screen.
  21. Press the POWER/MODE button once to start the warm-up sequence and to return to measuring mode.
Calibrating the CMS-4 CO Monitor-Alarm
Performing a Bump Test with the CMS-4 CO Monitor-Alarm

Performing a Bump Test

  1. For this test you will need a 25 ppm carbon-monoxide test-gas cylinder and the calibration connector assembly.
  2. Confirm that the calibration connector’s slide valve is closed by sliding it down, toward the test-gas cylinder connection.
  3. Screw the calibration connector onto the test-gas
  4. Turn off the monitor by pressing and holding the POWER/MODE button. The monitor turns off after 4 beeps. Release the POWER/MODE button after the monitor’s screen goes blank.
  5. Press and hold the AIR and POWER/MODE buttons. Release the buttons after the monitor beeps 1 time. The monitor beeps again, and BUMP displays in the bottom left of the screen.
  6. Press the POWER/MODE button once, and the calibration value displays near the lower-right corner of the screen.
  7. Snap the calibration cup to the front of the monitor over the sensor retainer. (The sensor retainer is located to the right of the screen.) The arrow embedded in the calibration cup must point up and to the left.
  8. Open the connector’s slide valve by sliding it up, to the open position.
  9. Press the POWER/MODE button once. The gas reading flashes, and the monitor counts down from 30 seconds in the lower-right corner.
  10. After the countdown reaches zero, the bump test is complete.
  11. If the bump test fails, a calibration is immediately and automatically started. Continue to apply the calibration gas. AUTO CAL will appear at the bottom of the screen, and a countdown will appear in the bottom right. Refer to the operations manual for more information about a failed test.
    • The bump test gets its name from back in the days when coal miners brought caged canaries into mines because the birds fell victim to carbon monoxide and other poisonous gases before the miners. Miners would grab caged canaries and lightly bump them against a wall to check that they were still alive.
  12. If the bump test passes, P (passed) displays on the left of the screen display.
  13. Close the connector slide valve, remove the calibration cup from the monitor, and unscrew the calibration connector from the test-gas cylinder.
  14. Press the POWER/MODE button once, and END displays in the bottom left of the screen. The monitor will then beep, and BUMP now displays in the bottom left of the screen.
  15. Press the AIR button 14 times, and START displays in the bottom left of the screen.
  16. Press the POWER/MODE button once to start the warm-up sequence and to return to measuring mode.

Correct operation of the CMS-4 is necessary to protect blast operators from carbon monoxide poisoning, which can cause severe injury and even death. The purpose of this video is to familiarize viewers with the most commonly needed functions. However, this video is not a replacement for reading the CMS-4 Operations Manual, which should be read in full by anyone who uses the monitor.