DigiVac VAPOR Посібник з експлуатації - Сторінка 6
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The VPC family of products can be calibrated in the field provided that an accurate vacuum
instrument standard exists. Typically, that instrument standard should be 4x as accurate, or
at the very least much more accurate than the VPC. The standard should resolve to better
than +/- 0.25 Torr.
1. Plug in A/C adapter, connect cable to vacuum sensor. Maintain system at 2 Torr +/-
0.25 Torr. Turn "Vac" pot so the vacuum on the VPC reads 2 Torr
2. Raise pressure to 760 Torr. Adjust "SPAN" so VPC indicates 760 Torr
Here are a few trouble shooting steps:
Observation
System does not light up
System takes too long between set points
My readings are erratic
When I turn on my unit and turn on my vacuum
pump, the vacuum reading doesn't go down.
My VPC is really noisy
1020 Campus Drive West, Morganville, NJ 07751 - Office: 732-765-0900
Fax: 732-765-1800 - [email protected] - www.digivac.com
Calibration Procedure
Possible Causes
Verify the system is plugged in, and all the cords
are tight
•
Take VPC out of the configuration
•
Time how long it takes for system without
VPC to get from the first vacuum level to
the second vacuum level
•
Re-install the VPC and run same test
•
Rerun the same test with a tuned orifice of
0.150"
•
If the last 2 test are close, that means the
VPC is performing as it should. If the last 2
tests are different, it means the VPC is not
performing optimally. Please consult your
vendor for technical assistance.
Check reading with another gauge to see if the
readings are indeed erratic. If the other gauge
does not show erratic readings, consult your
vendor.
Verify the switch on the right is in the "regulate"
setting, and the vacuum pump is running.
The VPC valve is a bit noisy, but more of a finger
tapping loudness. If you hear a loud metallic
sound, then something is wrong. Consult your
vendor.
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