Specifications

Ammonia Gas Monitor – Multi Zone

Instruction 3015-5113

Current Loop Interfaces

Optional 4–20 mAdc Outputs

Upon installation of the optional 4–20 mAdc Interface Board (page 14) (P/N 3015-5152), the AGM-MZ has the

capability of providing dual 4-20 mAdc scrolling current loop outputs for connection to external monitoring

devices. Loop outputs are powered internally. Do not use an external power supply as this can damage the

loop card.

The interfaces are set up as follows:

Loop 1 indicates zone area

Loop 2 indicates PPM

Connection

The external devices are connected to the AGM-MZ using a shielded dual twisted pair cable. Use any of the

remaining service knockouts to gain access to the interior of the monitor. Locate the Dual 4–20 mAdc Output

connector (page 14) and remove it from the circuit board. Secure the wire leads to the connector orienting

them as shown in the diagram below. Check to make sure the polarity matches the wiring at the external

device. When you are through securing the connections, carefully plug the connector back onto the circuit

board.

NOTE: When one or both current loop outputs are not used, install a jumper wire between the ground and the

unused loop terminal(s) to prevent the system from generating a current loop fault.

CAUTION: The loop outputs have isolated grounds. Therefore the cable shield

should be terminated at the receiver and not the AGM-MZ. The signal for both current

loops must be returned to the AGM-MZ.

Current Loop Connector

NOTE: The ground connections are common.

LOOP 1 = ZONE

LOOP 2 = PPM

5 mAdc = Zone 1 Default

6 mAdc – Zone 2 0.016 mAdc = 1 PPM

--- Scalable via Software

--- 4 mAdc = 0 PPM

20 mAdc = Zone 16 20 mAdc = 1000 PPM

LOOP 2

PPM

LOOP 1

ZONE

NOTE:

SIGNAL OUT

ONLY DO NOT

APPLY POWER

GROUND