Pump Speed; Set Pump Stall - WatchGas NEO User Manual

User Manual
Default display contrast is about 50%. You can change the contrast level with
For the display backlight options, choose from:
• Automatic.
• Manual.
• Off.
In Automatic, the backlight comes on and stays on in low light conditions. In Manual Mode, you can turn
the backlight on for a minute by pressing
OK
Ent Esc
1. Press or
OK
Ent Esc
OK
Ent Esc
2. Press to continue.
OK
Press to save and return to the alarm settings sub-menu.
Ent Esc

7.5.3 PUMP SPEED

The pump can operate at three speeds, low and high, ranging from about 250 to
350cc/min with a standard 0.45 μm filter in place.
Notes
• Low pump speed conserves a small amount of power.
• There is almost no difference in sampling accuracy.
• High pump speed offers faster instrument response, especially with long sampling hoses or when detecting
heavy compounds or compounds that get adsorped on inlet surfaces.
To change pump speed:
OK
Ent Esc
1. Press or
OK
Ent Esc
OK
Ent Esc
2. Press to continue.
3. Press to save and exit
OK
Ent Esc
Note
Each pump speed has its own Pump Stall threshold.

7.5.4 SET PUMP STALL

The pump shuts down when drawing a sample asks too much current, indicating
a blockage. Shutting down the pump saves pump life, the accompanying alarm
alerts the user that the sampling path is blocked.
The pump stall threshold is expressed in a current draw number. The number in
the top right corner of the screen is the present current draw.
To correctly set the pump stall threshold:
NEO Photoionization Detector
Ent Esc
or
to select the desired option.
to select the desired option.
Ent Esc
OK
OK
Ent Esc
from the readout screen.
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D e t e c t i o n D e t e c t i o n
OK
Ent Esc
or .
OK
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