Integrated Sampling Pump; Pump Status; External Water Trap Filters; Alarm Signals - WatchGas NEO User Manual

D e t e c t i o n D e t e c t i o n

5.4 INTEGRATED SAMPLING PUMP

The instrument is equipped with an integrated diaphragm sampling pump. It has three flow rate
settings, with flow ranging from 250 ml/min to 400 ml/min with an inlet filter attached.
As contamination builds up in the filter, the flow rate decreases.
Note:
• Always use the instrument with a clean inlet filter in place. Contamination can build up in and clog up the
pump, decreasing flow rate and increasing the risk of pump failure.
• Always change the inlet filter when it is visibly dirty.
• Make sure the inlet and outlet are free of obstructions before and during use.
Note:
Response time of the instrument drops with approximately 1 second for every 0.9 meters (3 ft) of tubing

5.4.1 PUMP STATUS

During normal operation, the pump icon alternately shows inflow and outflow. When a
pump failure or obstruction occurs, the pump alarm activates and the pump stall icon
blinks on and off. Clear the obstruction and press
5.5 EXTERNAL WATER-TRAP FILTERS
An external filter is mandatory to prevent moisture and dirt entering the instrument. Moisture and dirt
in the instrument can result in wear on the pump, false readings, and/or pump stalling.
To install the external filter:
1. Unscrew the old or contaminated filter.
2. Take a new inlet filter from the packaging.
3. Screw the new filter to the instrument's inlet probe using the Luer connection.

5.6 ALARM SIGNALS

During operation, the gas concentration is continuously compared with the alarm limits. If the
concentration exceeds any of the pre- set limits, the buzzer and red flashing LED are activated to warn
of the alarm condition. In addition, the instrument alarms when the:
• Battery voltage falls below a preset voltage level
• UV lamp is off
• Pump stalls
NEO Photoionization Detector
OK
to restart the pump.
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