Crystal WT Series Panel Mount Digital Pressure Gauge User Manual
Page 8
Functions
6
XP2i Operation Manual
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 WT Series is set to display inches of
water corresponding to the density of water at 4° C (39.2° F). You may require a diff erent water density for your application, so the WT Series can be set to use
the density of water at 20° C (68° F) or 15.6° C (60° F) instead.
To check and/or change the water density setting from the keypad, turn on the WT Series by pressing the
(
on/off
)
button and the
(
peak
)
button simultane-
ously. The display will indicate either
4C
,
60F
, or
68F
.
Press the
(
units
)
button until the display cycles to the desired water density, then press the
(
zero
)
button to store the selection (this will not zero the gauge).
Select and set the desired density of water.
Note:
If the WT Series is password protected, or inches of water is disabled, you will not be able to view or change the water density from the keypad.
Overpressure Conditions
The WT Series will read pressure up to approximately 110% of the rated pressure range. Above 110% percent of the range the display will start fl ashing and
the readings will not be reliable. The zero function does not aff ect the point at which the display starts fl ashing to indicate overpressure, so de pend ing on the
zero value it is possible that the display can start fl ashing without the maximum pressure being displayed.
For instance, if a 100 PSI WT Series 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 aff ect accuracy, but the eff ect is only tem po rary unless the sensor has been destroyed. See
Pressure Ranges, Display Scales, & Resolution
for maximum overpressure.