Part 3 Operation
3.4
Analog Output 4 - 20mA
** Caution: Integral 4 - 20mA converters are internally powered and do not require ex-
ternal power. DO NOT supply any voltage across these terminals as the 4 - 20mA output
will be damaged. It is also important to assure proper grounding of the external recording
device such as a PLC, DCS prior to connecting the 4 - 20mA.
When connecting the 4 - 20mA output, Pin 3 is the (+) positive side of the output. Pin 4 is the (-)
negative side of the output.
To verify the signal output of the 4 - 20mA circuit is working properly, connect an ammeter across pins
13 and 14 to verify. With no oxygen sensor connector, it should read approximately 4mA. If a sensor
is installed
,
you can verify the signal matches with the following formula:
Signal Output (mA) = [(Reading / Full Scale Range) x 16] + 4
For example, if we are reading 500ppm on the 1000 ppm range:
Signal Output (mA) = [(500/1000) x 16] + 4
Signal Output (mA) = 12mA
3.5
Range ID
** Caution: RANGE ID converters are internally powered and do not require external
power. DO NOT supply any voltage across these terminals as the output will be damaged.
It is also important to assure proper grounding of the external recording device.
When connecting the RANGE ID, Pin 15 is the (+) positive side of the output. Pin 16 is the (-) nega-
tive side of the output. To verify the signal output of the RANGE ID is working properly, connect a
voltmeter across pins 15 and 16 to verify. You can change the range manually in MANUAL RANGE
mode to verify:
Range 1
0 - 10 ppm
1 VDC
Range 2
0 - 100 ppm
2 VDC
Range 3
0 - 1000 ppm
3 VDC
Range
4 0
-
1%
4
VDC
Range 5
0 - 25%
5 VDC
