Crystal WT Series Panel Mount Digital Pressure Gauge - Manual (Page 4)

Overview  2
XP2i Operation Manual
—
OPERATING INSTRUCTIONS
The WT Series is shipped with bat ter ies installed, so it’s ready to use. Press and hold the
(
on/off
)
button. The WT Series will fi rst test all LCD seg-
ments. Release the
(
on/off
)
button when the WT Series indicates pressure.
The WT Series always resumes operation in the mode and the units of the pressure last used, and it does not automatically rezero when turned on.
Connect the WT Series to your system.
!
CAUTION: Never insert any object into the pressure connection! The sensor diaphragm is very thin and can be damaged or destroyed by solid or sharp
objects. Cleaning of the sensor must be done with ap pro pri ate solvents only.
!
WARNING: Severe injury or damage can occur through improper use of pressure instruments! Do not exceed recommended pressure limits of tubing
and fi ttings. Be certain all pressure connections are secured.
Most WT Series are intended for gauge pressure mea sure ment. That is, they indicate the diff er ence between applied pressure and ambient barometric pres-
sure. However, the
(
zero
)
button can be used to force a WT Series to read zero pressure at any applied pressure, up to the full scale rating of the gauge. The
factory default setting limits the maximum zero value to 20 PSI, but this limit can be changed with .
Some WT Series are rated for absolute pressure. Absolute gauges indicate the diff erence between applied pressure and an internal vacuum reference. Abso-
lute pressure is always positive. For instance barometric pressure at sea level is on average about 14.7 PSI (approximately 100 kPa or 1 bar), so at sea level this
is the lowest expected pressure indication. However, absolute gauges can be “zeroed” (unless prevented by Confi gXP). After zeroing an absolute gauge it is
possible to indicate a negative or positive gauge pressure.
!
WARNING: This gauge can display zero pressure when connected to a source of pressure! Do not rely on the display indication before disconnecting—
it may not be indicating true pressure. Never disconnect pressure instrumentation without fi rst relieving system pressure!