MultiRAE - Shawcity Limited

2.2.1 With the pump on, connect a flow meter to the MultiRAE inlet connector. The
minimum acceptable flow rate is 200 ml/min. on the high speed and 150 ml/min. on the
low speed. Rev C. boards only have one speed (high). If the flow is too low, check for
obstructions and leaks as in section 2.1.
2.2.2 If there are no obstructions or leaks, and the pump volume is still low, check the
voltage at the pump power terminals. It should be 3.5V. If the input voltage is correct,
then the pump should be rebuilt or replaced (P/N 008-3043-002). Replacement
diaphragms are available through RAE Systems (P/N 081-0007-000).
2.3 Sensor missing or not identified
2.3.1 Always check the Programming Mode to verify that all sensors are enabled. Enter
the programming menu ([N] and [MODE] together). Press [N] 4 times, or until the
display reads “Change Sensor Configuration” Answer “Y”. The second option under
the “Change Sensor Configuration” menu is to Enable/Disable Sensors. When this
option is selected the display shows all installed sensors with a “*” next to the sensors
which are enabled. Use the [MODE] key to scroll the cursor through the sensors. [Y]
Enables sensors and [N] disables sensors. Hold the [MODE] key down until the display
shows “save” to exit from this function. When a sensor is disabled the instantaneous
display screen will be blank in that sensor location. The “Display Sensor Location”
screen (press [MODE] once from the instantaneous screen) shows “---“ in the sensor
positions which have been disabled.
2.3.2 Verify the sensor configuration: The MultiRAE sensors have sensor type and
expiration date stored internally. During the power-on tests the unit identifies all
installed sensors and compares this to the configuration list. Make a note of which
sensors the unit does identify by pressing [MODE] once from the instantaneous display.
Turn off the unit. Remove the top cover. Disconnect the battery. Failure to disconnect
the battery before removing or installing sensors could blow the battery pack
internal fuse. Remove the gas piping plate. Verify the identity of each installed sensor.
Remove, inspect, and re-insert each sensor making sure each is fully seated in its socket.
Be sure that the shorting pin is no longer across the bottom of the sensor. The tops of the
sensors should all be at nearly the same height. Pay particular attention to any sensors
which were not identified. If pins are missing or the sensor or circuit board shows signs
of damage do not re-insert the sensor: it must be replaced.
2.3.3 Re-connect the battery and turn on power. “Configuration changed” may appear
now even if all the sensors are working. Note which sensors are identified when the unit
warms up and if all the installed sensors are now identified, then turn off power and reassemble
the unit. A full calibration must be performed before using the unit, as
calibration data may have been lost. Sensors which require a bias (NO and NH 3 ) must be
installed, unit turned on and running, for 24 hours before stable readings can be obtained.
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