PCME QAL 181 X, User Manual, Page: 56 / 106

- PCME QAL 181 MANUAL: 56 -
6.9 4-20mA Settings
The AutoDetect procedure automatically assigns the detect sensor channels to 4-20mA outputs in
the control unit (scaled 0->100 mg/m3). The 4-20mA settings function allows:
•
Re-scaling of the 4-20mA outputs
•
Applying filtering to the 4-20mA outputs
•
Reassigning of the 4-20mA outputs (both within the control unit and from additional
Analogue Output Modules)
•
Fine tuning (calibration) of the 4mA and 20mA levels of the outputs.
The MultiController has four independent 4-20mA outputs. The Interface Module has a single 4-
20mA output. These outputs can be user assigned to any sensor in the network. The outputs
have the following specification:
•
Isolated outputs
•
Maximum loading: 500 Ohms
•
Update rate: 1 second
Scaling and Filtering 4-20mA Outputs
Select ‘Setup’ display
Menu route:
4-20mA Settings
The following screen is displayed:
Figure 5-5 4-20mA Settings
The four rows in the table correspond to outputs 1, 2, 3 & 4. To assign a sensor to an output,
select the group and name box then select the required sensor from the device list. The zero,
span and filter may then be changed as required:
Zero: The displayed reading corresponding to 4mA output. Factory setting is 0.000.
Span: The displayed reading corresponding to 20mA output. Factory setting is 100.
Zero
4-20mA Settings
Device
1
2
3
None Selected
None Selected
None Selected
Back
Span Filter (secs)
4
None Selected
0.000 100.0 0001
0.000
0.000
0.000
100.0
100.0
100.0
0001
0001
0001
Calibration