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65-2666RK-04 M2A Transmitter Operator’s Manual
Chapter 4: Operation
Overview
This chapter describes the M2A in normal operation. This chapter also describes the M2A in alarm 1, alarm 2,
and fail conditions and suggests responses to these conditions.
Normal Operation
Normal operation is defined as follows:
•
The start-up procedure is complete.
•
The M2A is not indicating an alarm 1, alarm 2, or fail condition.
•
The M2A is not in Calibration, Configuration, or Gas Type modes.
During normal operation, the M2A simultaneously displays the current gas reading, unit of measure, and target
gas.
Information Screen
The Information Screen displays the M2A’s operating voltage and firmware and hardware information. To
display the Information Screen, do the following:
1. Press and hold the DOWN/NO button for 3 seconds. The Information Screen will appear.
2. Continue holding the DOWN/NO button to keep the Information Screen on the display. The top line
indicates the operating voltage that is connected to the M2A. The second line indicates the firmware that is
running, version 5.0 in this example, and the M2A’s hardware version, version 2A in this example. This
information may be useful if you need to contact the factory with questions about the M2A.
3. Release the DOWN/NO button when you are done viewing the Information Screen. The display will return
to the normal operation screen within a couple of seconds.
4 - 20 mA Signal Output Operation
The output at the S terminal of the power/signal terminal strip is a 4 - 20 mA signal that corresponds to the
detection range of the M2A. During normal operation, this signal tracks the gas concentration on the OLED
display.
There are several circumstances where the signal output will not track the display reading but will behave as
follows:
•
When the M2A is in its warm-up period, the signal output will be fixed at 17.4 mA (20.9% oxygen).
OXYGEN
20.9 %
24.2V
v5.0L 2A
