Macurco CD Series, User Instructions

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Macurco CD-xx H/MC Manual
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4.4 4-20mA Loop
Clean Air – With the 4-20 mA func tion turned “On” and the current concentration of CO
P
2
P
ppm, the 4-20mA loop will output a
mA reading equivalent to the current gas reading of the detector.
Fan Level – With the 4- 20 mA function turned “On” and the current concentration of CO
P
2
P
ppm detected is at or greater than the
Fan Relay Setting (Frs), the 4-20mA loop will output between 4 mA and 20 mA depending on the current concentration of CO
P
2
P
.
See figure
31 T
3-1 4-20 mA Output diagram
31T
or figure 3
31T
-9 12-Series 4-20 mA Output diagram
31T
Alarm Level – With the 4- 20 mA function turned “On” and the current concentration of CO
P
2
P
ppm detected is at or greater than
the Alarm Relay Setting (Ars), the 4-20mA loop will output between 4 mA and 20 mA depending on the current concentration of
CO
P
2
P
. See figure
31T
3-1 4-20 mA Output diagram
31T
or
31T
figure 3-9 12-Series 4-20 mA Output diagram
31T
Trouble – With the 4- 20 mA function turned “On” and Trouble Fan Setting enabled. The 4 -20mA loop will output less than 4 mA
or greater than 20 mA depending on the Trouble condition. See section
31T
5.1 On-Board Diagnostics
31T
.
4.5 Default – Factory Settings
Setting: Default:
Power Up Test On
Display On
Buzzer On
Alarm Relay Setting 4000 ppm
Alarm Relay Configuration Normally Open (NO)
Fan Relay Setting 1000 ppm for CD-xxH
1000 ppm for CD-xxMC
Fan Relay Delay 3 minutes
Fan Relay Minimum Runtime 0 minutes
Fan Relay Latching Off
Trouble Fan Setting Off
4-20mA On
Table 4-1 Default settings