User Mode Main Menu; Integrated Sampling Pump; Pump Status - WatchGas NEO User Manual

3.3 USER MODE MAIN MENU

OK
Ent Esc
Press the Up key or Mode key to cycle through the main menu screens. If no
OK
Ent Esc
action us taken on any screen for 60 seconds, the display will return to the main menu
automatically.
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WATCHGAS BLE
Flow chart for basic User Mode main menu

3.4 INTEGRATED SAMPLING PUMP

The instrument includes an integrated, diaphragm-type sampling pump, providing flow
rates of 330 to 450 cc/min. adjustable in three speed settings. When used with a 25
mm diameter 0.45 µm filters the flow rate is about 250 to 360 cc/min. at low and high
settings. Flow will decrease if the filter accumulates particulate matter, or if a filter is
not used and particles get caught in the pump diaphragm. Connecting Teflon tubing with
1/8" inside diameter to the gas inlet port, this pump can pull air samples from 200' (61 m)
away horizontally, or 90' (27.5 m) vertically, at about 3' (0.9 m) per second flow rate. Note
that at 200' the PID response will be delayed by about 1 minute, the time required for the
gas sample to reach the instrument.
IMPORTANT!
During operation, make sure the probe inlet and the gas outlet are free of obstructions.
Obstructions can cause premature wear on the pump, false readings, or pump stalling.

3.5 PUMP STATUS

During normal operation, the pump icon alternately shows inflow and
outflow. If there is a pump failure or obstruction, the alarm sounds
and the pump stall icon blinks on and off. If this occurs, clear the
obstruction and press the Right key to restart the pump.
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