EMS 1304 - 4-20 Ma Outputs; Recorder or Other Device Calibration

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4-20mA outputs
Reference Drawing # 1131
The Model EMS1304 comes with two 4-20mA outputs. The ranges are set during final test to the information
supplied by the customers.
Maximum output Loop compliance is 800 Ohms.
AOUT1 (instantaneous opacity, zero/span when in check mode) is connected at Control unit terminals 11 & 12
and supplies the opacity signal to a recorder or DAS and too the service module 14 & 13 (on TB1, - 1101) for
display at the sensor location.
AOUT 2 (average opacity, zero/span when in check mode) is connected at Control unit terminals 13 & 14.
No calibration is necessary; however if you want to check that other devices such as recorders or DAS are
responding correctly use the following procedure.
Recorder or other device calibration:
On the control unit front panel press the AUTO/MAN key for a maintenance zero and span cycle. Both outputs
will correspond to the opacity display value.
(+) Recorder/DAS (-)
14
11+
13
12-
Sensor location
terminal TB 1
EMS1304 Control
unit rear panel
terminals