PCME STACK 990 User Manual

- PCME STACK 990 MANUAL: 41 -
Filter: The time constant in seconds of the smoothing applied to the 4-20mA output. Factory
setting is 0001.
An example is shown below:
Figure 5-6 4-20mA Configuration Example
Output 1 set up to output Stack1 Dust readings in the range 0 to 50 with no additional filtering
applied. Output 2 is set up to output Stack 3 Dust readings between 20 and 40 with a 30 second
filter applied.
Therefore if Stack1 Dust = 25mg/m
3
then Output 1 = 4 + 25/50 * (20-4) = 4 + 8 = 12mA.
If Stack3 Dust = 25mg/m
3
then Output 2 = 4 + (25-20)/(40-20) *(20-4) = 4 + 4 = 8mA.
Testing and Calibrating 4-20mA Outputs
The 4-20mA outputs can be tested for correct output current.
Select ‘Setup’ display
Menu route:
4-20mA Settings ↵
Calibration
The following screen is displayed:
Figure 4-6 4-20mA Calibration
Zero
4-20mA Settings
Device
1
2
3
Stack1 Dust
Stack3 Dust
None Selected
Back
Span Filter (secs)
4
None Selected
0.000 50.00 0001
20.00
0.000
0.000
40.00
100.0
100.0
0030
0001
0001
Calibration
4-20mA Calibration
Select Channel
Back
1
Start 4mA Test
Increase Current Decrease Current
Digital Value 0665
Start 20mA Test
Increase Current Decrease Current
Digital Value 3373

PCME STACK 990 Specifications

General

Brand	PCME
Model	STACK 990
Category	Measuring Instruments
Language	English