Macurco
TM
Macurco RD-24 Manual
REV
–
1.0.0
[34-8708-4770-1]
13
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P a g e
Figure 4-5
–
Zone 4-20mA Output Number Menu
NOTE: Oxygen sensor readings are excluded for 4-20mA output i.e., oxygen sensor readings are not considered while
computing output value for 4-20mA output.
Next, the output mode can be set to PEAK or SCALE.
PEAK
–
In this mode, the gas reading active in the zone (except for oxygen) corresponding to highest mA output is
used to control the analog output assigned to the specific zone. In this case, any active gas reading, that is part of
the zone will be taken into consideration, and the sensor reading corresponding to highest mA output will be used
to control the analog output. E.g. If a CO and NO2 sensor is assigned to a zone and CO Sensor reading is 50ppm
(which corresponds to 8mA) and NO2 sensor reading is 10.0ppm (which corresponds to 12mA) then the 4-20mA or
“
Analog
”
output assigned to the zone will output 12mA.
SCALE
–
In this mode, the 4-20mA value for all detectors added to a zone are computed (for all sensor types except
oxygen), and the output is the average of the 4-20mA value for all detectors assigned to the zone. E.g. If a CO and
NO2 sensor is assigned to a zone and CO Sensor reading is 50ppm (which corresponds to 8mA) and NO2 sensor
reading is 10.0ppm (which corresponds to 12mA) then the 4-20mA or
“
Analog
”
output assigned to the zone will
output 10mA.
To select the output mode for 4-20mA output, select OUTPUT MODE from the 4-20 O/P menu and press ENTER.
Then, select PEAK or SCALE from the 4-20 O/P MODE menu and press ENTER. The display will return to the 4-20 O/P
menu and the output mode selection will be updated as shown in Figure 4-29.
When the status of the zone is TROUBLE then 4-20mA output assigned to corresponding zone will switch the output
to 20mA.
