RKI Instruments M2 for 12 VDC - Manual (Page 19)

M2 Transmitter Operator’s Manual, 12 VDC Operation 14
• When the M2 is in its warm-up period, the signal output will be fixed at 3.5 mA (zero).
• When the M2’s gas type is changed, the M2 will enter Configuration Mode for you to
verify the parameter settings. When you exit Configuration Mode, the display will
indicate NEEDS CALIBRATION and will continue to indicate this until Calibration
Mode is entered and a calibration is performed. In this situation, the signal output will
be fixed at 3.5 mA from the time Gas Type Mode is entered until the M2 is calibrated
and returns to normal operation.
• If you enter Calibration Mode, Configuration Mode, Gas Type Mode, or Modbus
Mode, the signal output will be fixed at 3.5 mA until the M2 returns to normal
operation.
• If the M2’s input power decreases below 10.5 volts so that the M2 is in a low power
alarm, the signal output is fixed below 2.4 mA until the low power alarm is cleared.
• If the M2 goes into a fail condition, after a 30 second delay, the signal output is fixed
below 2.4 mA until the fail alarm is cleared. During the 30 second delay, the signal
output follows the detector output. In the case of a downscale reading, the display
and the signal output continue to track the reading down to -99% of full scale (1.15
mA).
Alarm Indications
NOTE: The M2 includes alarm on and alarm off delay settings for alarm 1 and alarm 2.
The alarm indications described in this section operate according to the factory
set alarm settings. See Table 5 on page 18 for all the factory settings.
Table 4: Visual and Audible Alarm Indications
Condition Cause Visual Indication(s)
Alarm 1
1 Increasing gas reading at or above the
alarm 1 setpoint • A1 LED is on
• Gas reading alternates
with ALARM-1 message
Alarm 2 1 Increasing gas reading at or above the
alarm 2 setpoint • A2 LED is on
• Gas reading alternates
with ALARM-2 message
Fail • Disconnected or misconnected
detector wiring
• Display reading at -10% of full
scale or lower
• Defective components
• F LED is on
• FAIL message replaces
gas reading
NOTE: There is a 30 second
delay on the fail condition.
Low Power DC power source less than 10.5 volts. • F LED is on
• LowPower message and
actual voltage of
incoming DC power
*
1
If the M2 is in both an alarm 1 and an alarm 2 condition, both alarm LEDs are on and the
display alternates between the gas reading and the ALMS 1&2 message.