MZ-RD – Multi-Zone Remote Display
Instruction 3015-5157 35
Field Name Description
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.
PRES
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 Fault code listed in hexadecimal. See Fault Code list.
y.yyyX Calibration multiplier used when measuring concentration.
TCx.xxxx
Temperature Compensation – magnitude of voltage applied to sensor output (in volts). Factory use
only.
MODBUS data
485 RX=x Receive port number of bytes FUNC Function
485 TX=x Transmit port number of bytes REG=xxxxx Register address
4.11. Service Mode
When activated, the Service Mode will disable a specific gas monitor for a specified length of time,
up to 240 minutes (4 hrs) to permit time for servicing the unit. The default is 60 minutes. This
time interval can be changed as described in the Service Timeout section.
IMPORTANT: Note that while in the Service Mode, no measurements are made, nor are alarms
activated.
1. From the System Screen, select the gas monitor you wish to place into Service Mode.
2. On Monitor Setup Screen #1, select SERVICE MODE ENTRY. An IN SERVICE option
will appear to continue to “CONFIRM” or to “QUIT”.
3. To confirm IN SERVICE, press the ENTER key twice within 3 seconds.
Note that the System Screen will display which monitors are in the Service Mode.
To exit the Service Mode, select QUIT.
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