Specifications

Ammonia Gas Monitor – Multi Zone
42 Instruction 3015-5113
NOISE: A 16 point running average of the noise portion of IR bench output. This reading is valuable
mostly when ammonia is not present.
AVEAU: Average Absorbency – Optical absorbency computed from the Average Detector Voltage
and Zero Voltage. In the absence of ammonia, the absorbency is 0.000AU. When sampling ammonia,
its value varies proportionally with the concentration.
UM/L: uMoles/L – Absolute concentration in micro-moles per liter of ammonia based on Noise and
the internal calibration. There are two figures displayed. The first (annotated by a B) is the actual
measurement at the IR bench. The second is the calculated value corrected to ambient conditions
(temperature + pressure).
PPM: Parts Per Million is the volume concentration referenced to standard temperature and pressure
and is computed from the Average Absorbency, Zero Temperature and Ambient Pressure. There are
two figures displayed. The first (annotated by a B) is the actual PPM at the IR bench. The second is a
PPM reading normalized to standard temperature and pressure.
ZERO: Zero Temperature - Displays the sensor and enclosure temperature measured and stored
during the last purge cycle in degrees C.
BENCH: Bench Temperature – Current IR sensor temperature in degrees C as well as the raw
voltage coming from the temperature sensor. This value can range from ambient to ambient +15
degrees C.
BOX: Box Temperature – This is the current internal enclosure temperature along with the raw
voltage from the temperature sensor, and has the same range as the Bench temperature.
PRESS: Pressure – This is the current absolute manifold pressure in PSIA along with the output
voltage of the pressure sensor. This value should always be 0.2 to 1.0 PSIA below ambient (AMB).
VAC: Vacuum – The vacuum pressure is measured every purge cycle by closing all sample valves.
Its value is typically 2.5 to 4.0 PSIA below ambient pressure.
AMB: Ambient – Ambient pressure is measured every purge cycle with the sample pump off and the
manifold open. Its value is weather and altitude dependent and can range from 10.0 to 15.5 PSIA.
FAULT CODE: See Fault Code list.
(XXXX FEET): Programmed length of tubing for an active zone.
MODBUS data:
485 RX=x Receive port number of bytes
485 TX=x Transmit port number of bytes
FUNC Function
REG=xxxxx Register address
Service Mode
The Service Mode option is located on the System Setup screen in the bottom right corner.
When activated, the Service Mode will disable the AGM-MZ unit for a specified length of time. The default is
60 minutes. This time interval can be changed as described in the
Service Timeout section on page 29.
IMPORTANT: Note that while in the Service Mode no measurements are made, nor are any alarms activated.
Access the service mode options from the initial Data Display Screen. Press the SERVICE MODE ENTRY
option twice within 3 seconds.
To exit the Service Mode, again press the SERVICE MODE ENTRY option twice within 3 seconds.