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Macurco CD-xx H/MC Manual
REV – 1.1 [34-2900-0510-8] 24 | P a g e
6.1 Sensor Life Reset
The CD-xxH/MC does not have a sensor life reset option.
6.2 Cleaning
Cleaning of the external surfaces is best carried out using a damp cloth with a mild detergent or soap. Use a vacuum cleaner
with a soft brush to remove dust or contamination under the cover. Do not blow out the sensor with compressed air.
42T
CAUTION
Avoid the use of harsh cleaning materials, abrasives and other organic solvents. Such materials may permanently scratch the
surfaces and damage the display window, labels, sensor or instrument housing. High voltage terminals (100-240VAC) are
located within this detector, presenting a hazard to service technicians. Only qualified technicians should open the detector case
and service the internal circuits. Ensure power is removed from the detector prior to cleaning the unit.
7 Testing
WARNING
Using a certified gas with a concentration other than the one listed for this detector when
conducting a calibration verification test (bump test) will produce inaccurate readings. This means
that higher levels of the gas being monitored may be present and could result in overexposure.
For proper use, see supervisor or User manual, or contact Technical Support at 1-844-325-3050.
All CD-xxH/MC units are factory calibrated and 100% tested for proper operation. During normal operation, the green status
indicator LED light will be on steady, the fan & alarm relay will be in standby mode and the 4-20 mA output will corresponding
to the gas reading of the detector. Refer to figure
3 1T
3-1 4-20mA Output diagram
31T
or figure
31 T
3-9 4-20 mA Output diagram
31T
, for
expected value. The unit also performs a regular automatic self-test during normal operation. If the unit detects an improper
voltage or inoperable component, it will default into Error mode. In this error mode, the Alarm relay will be activated, the 4-20
mA current loop will go to 24 mA, the unit will display the error code, the green status indicator LED light will flash, and the
buzzer will chirp intermittently. The
Fan relay will also engage if the Trouble Fan Setting Option is set to “ON”.
7.1.1 Operation Test
Check that the green CD-xxH/MC status indicator LED light is illuminated continuously. If not, do not proceed with the tests. If
the unit is in error mode, contact your local representative or Macurco technical support representative for information on
resolving the problem.
1. Remove the single screw in the middle of the front cover of the CD-xxH/MC.
2. Remove the front cover.
3. Observe the LED light on the front of the CD-xxH/MC.
4. If the light is solid green proceed to step 6.
5. If the green status indicator LED light is off or flashing, refer to the General section above.
6. Locate the switch labeled ENTER/TEST on the left side of the printed circuit board. Press the Test switch once.
7. The CD-xxH/MC will step through a cycle test:
a. The display progresses through the BUZ (Buzzer Test), Art (alarm relay test), Frt (fan relay test) then 42t (4-20
mA output test). Make sure that the settings
are “on” or not disabled “diS”.
b. During the first 10 seconds of the test cycle, the display will show BUZ and set off the audible buzzer. The
alarm relay will be closed, so any devices connected to that relay will be tested.
c. The Fan relay will be activated for the next 1 minute of the test, so if the fan circuits are wired in the normal
manner, the fan should run.