Macurco CM-6 - Display Behavior (Off); 4-20 mA Loop Operation

Macurco CM-xx Operation Manual
REV – 1.2.1 [34-2900-0511-6 ] 19 | Page
Alarm level – With the display function turned “On” and the CO concentration reaching the Alarm Relay setting, (200 ppm, for
example) the display will flash back and forth between “ALr” and “200” or current concentration of gas. The buzzer will sound
indicating “Alarm” if the buzzer is turned “On”.
Trouble – With the display function turned “On” and the device is in a trouble state, the display will display the “t” Error code
(t01 for example). If the Trouble Fan Setting is enabled, the Fan relay will switch activating the relay. See section 4.5.11 Trouble
Fan Setting – “tFS” and section 5.1.2 “t” Error Codes and
Calibration Due- With Calibration Period functionality enabled, if a detector is within 1 month of calibration period, then display
will flash back and forth between “dUE” and current gas reading. Calibration Due is resolved only with successful field
calibration.
4.3 Display turned “Off”
Clean Air – With the display function turned ”Off”, the display does not show the CO concentration. Only the Power indicator
light on will be on.
Fan Level – When the CO concentration reaches the Fan Relay setting (35ppm, for example) the display will show “FAn”
continuously as long as the fan relay is enabled. This appears as slowly flashing “FAn”.
Alarm Level – With the display function turned off the display does not show the CO concentration but will show “ALr” when the
Alarm relay is activated.
Trouble – With the display function turned “Off” and the device is in a trouble state, the display will display the “t” Error code
(t01 for example). If the Trouble Fan Setting is enabled, the Fan relay will switch activating the relay. See Section 4.5.11 Trouble
Fan Setting – “tFS” and Section 5.1.2 “t” Error Codes.
Calibration Due- With Calibration Period functionality enabled, if a detector is within 1 month of calibration period, then display
will show “dUE” continuously. Calibration Due is resolved only with successful field calibration.
4.4 4-20 mA Loop
4-20mA settings selected to ‘bAS’ or ‘EnH’ is considered as 4-20mA function turned ON.
Clean Air – With the 4-20 mA function turned “On” and the current concentration of CO ppm at “0” (zero), the 4-20mA loop will
output 4 mA.
Gas read – With the 4-20 mA function turned “On” the output will read between 4 mA and 20 mA depending on the current
concentration of CO.
Trouble – With the 4-20 mA function turned “On” and Trouble Fan Setting enabled. The 4-20mA loop will output 1 mA or 24 mA
depending on the Trouble condition. See Section 5.1 On-Board Diagnostics.