Analog Communication

The device is capable of the following types of analog outputs:

•

4–20 mA, isolated, current sourcing

•

0–10 Vdc for gas sample point identification

Scale Analog Output: 4–20 mA

Full scale is 1000 ppm.

Normal gas readings are at 4–20 mA. The reading is proportional to the detected gas concentration.

For the factory default of 100% full scale setting (0.016 mA = 1 ppm):

Output (mA)	Gas Concentration (ppm)
4	0
5	63
6	125
7	188
8	250
9	313
10	375
11	438
12	500
13	563
14	625
15	688
16	750
17	813
18	875
19	937
20	1000

Analog Output Settings

Warm-up	Default = 3.5 mA User adjustable between 0 and 3.75 mA
Calibration (nonconfigurable)	3.0 mA
Fault	Default = 2.0 mA User adjustable between 0.5 and 3.75 mA
Device over range (nonconfigurable)	21 mA

0–10 Vdc

The voltage output can be used to identify any active gas sample line.

Sample Line	Vdc 4 or 8 pt system	Vdc 16 pt system
1	1	1.0
2	2	1.5
3	3	2.0
4	4	2.5
5	5	3.0
6	6	3.5
7	7	4.0
8	8	4.5
9	-	5.0
10	-	5.5
11	-	6.0
12	-	6.5
13	-	7.0
14	-	7.5
15	-	8.0
16	-	8.5

While the device is in calibration mode, the output is 10 Vdc.