Macurco CD-6B - Relay Latching; Display Turned Off

Macurco CD-6B Manual (Rev-1.0) Eng
REV – 1.0 [34-2900-0510-2 ] 14 | Page
• Clean Air – and in clean air, the display will show the current concentration of CO
2
in the air.
Note: CO
2
in “clean air” will not show 0 as normal atmospheric CO
2
levels are between 0.03% and 0.05%.
• Awareness Alarm - and the CO
2
percentage reaching 0.50%, the display will flash “gas reading”. The buzzer
will sound (beep every 60 seconds) if “bUZ” is turned “On”.
• Alarm 1 level – and the CO
2
percentage reaching the Alarm 1 Relay setting, the display will flash between
“ALr1” and “current gas reading”. The buzzer will sound (beep every second) if “bUZ” is turned “On”.
• Alarm 2 level – and the CO
2
percentage reaching the Alarm 2 Relay setting, the display will flash between
“ALr2” and “current gas reading”. The buzzer will sound (beep every second) if “bUZ” is turned “On”.
• Alarm 3 level – and the CO
2
percentage reaching the Alarm 3 Relay setting, the display will flash between
“ALr3” and “current gas reading”. The buzzer will sound (beep every second) if “bUZ” is turned “On”.
• Trouble –and the device in a trouble state, the display will show the “t” Error code (t01 for example). If the
Trouble Fan Setting “tFS” is enabled, the Alarm 1 Relay will activate. See section 5.1.2 “t” Error Codes
31T and
section 4.5.11 Trouble Fan Setting – “tFS”.
• Calibration Due – With Calibration Period functionality enabled, if a detector is within 1 month of calibration
period, the display will flash between “dUE” and current gas reading. Calibration Due is resolved only with a
successful field calibration.
4.6.3 Display turned “Off”
With the display function turned off,
• Clean Air – and in clean air, the display does not show the CO
2
concentration. Only the Power indicator light
on will be on.
• Awareness Alarm - and the CO
2
percentage reaching 0.50%, the display will show nothing. The buzzer will
sound (beep every 60 seconds) if “bUZ” is turned “On”.
• Alarm 1 Level – and the CO
2
percentage reaching the Alarm 1 Relay setting, the display will show “ALr1”.
The buzzer will sound (beep every second) if “bUZ” is turned “On”.
• Alarm 2 Level – and the CO
2
percentage reaching the Alarm 2 Relay setting, the display will show “ALr2”.
The buzzer will sound (beep every second) if “bUZ” is turned “On”.
• Alarm 3 Level – and the CO
2
percentage reaching the Alarm 3 Relay setting, the display will show “ALr3”.
The buzzer will sound (beep every second) if “bUZ” is turned “On”.
• Trouble – and the device in a trouble state, the display will display the “t” Error code (t01 for example). If
the Trouble Fan Setting “tFS” is enabled, the Alarm 1 Relay will activate. See section
31T5.1.2 “t” Error Codes31T
and section 31T4.5.11 Trouble Fan Setting – “tFS”.
• Calibration Due – With Calibration Period functionality enabled, if a detector is within 1 month of calibration
period, the display will show “dUE” continuously. Calibration Due is resolved only with a successful field
calibration.
4.7 Relay Latching
Each alarm relay has the relay latching option. This controls the alarm behavior after an alarm has been activated
and the gas concentration returns below the alarm level.
Latching On – When the relay latching option is set to “On” and the gas concentration triggers the alarm, the relay
will not deactivate when the gas concentration drops below the alarm level. The power will need to be interrupted
or the “ENTER/TEST” button pressed to un-latch (turn off) the relay condition.