nVision
Operation Manual
•
Page 17
Pressure.(PM).Module.Instructions
CPF.Pressure.Fitting
Crystal CPF System:
Medium Pressure Female (MPF) (1/4” medium pressure tube system with
7/16-20 threads).
See Crystal Engineering’s CPF Brochure for further information.
CPF o-ring size and material:
AS568A-012, Viton 90 durometer (P/N 3981).
CAUTION:
To achieve CPF maximum allowable working pressures no o-ring substitutions
are allowed.
See Crystal Engineering’s CPF brochure and CES-003 CPF Safety Guide avail-
able from the website at
http://www.crystalengineering.net
for further detail.
Measuring.Vacuum
All versions of the nVision can be used to measure moderate vacuum.
When measuring pressure less than ambient barometric conditions, a minus (-) sign will appear.
CAUTION:
The nVision is not recommended for continuous use at high vacuum.
Water.Density.(Inches.of.Water)
The following applies only to models where inches of water is a selectable pressure unit. As
shipped from the factory, the
nVision
is set to display inches of water corresponding to the
density of water at 4°C (39.2°F).
You may require a different water density for your application.
CrystalCon-
trol allows the user to select the appropriate water density desired at 4°C (39.2°F), 20°C (68°F) or
15.6°C (60°F) temperatures.
Overpressure.Conditions
The nVision will read pressure up to approximately 110% of the rated pressure range. Above
110% of the range the display will start flashing and the readings will not be reliable. The zero
function does not affect the point at which the display starts flashing to indicate overpressure,
so depending on the zero value it is possible that the display can start flashing without the
maximum pressure being displayed.
For instance, if a 100 PSI nVision is zeroed when 30 PSI is being applied, it will indicate that the
overpressure condition has been reached at 80 PSI (i.e., 110% x 100 PSI – 30 PSI = 80 PSI).
Overpressure can affect accuracy, but the effect is only temporary unless the sensor
has been destroyed. See Pressure Module (PM) Specifications for maximum allowable
overpressure ratings.
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