Crystal 2100 Series - Manual

PRESSURE is Our BUSINESS TM
PN: 2102
8/01
Page 1 of 8
2100 Operation Manual
Introduction
Crystal Engineering 2100 Series Pressure Gauges
and Calibrators measure almost any type of pneu-
matic or hydraulic pressures and, depending on the
model, up to 500 PSIG. These instruments can also
be used to measure vacuum.
2120s are pressure gauges only, 2121s include a
high accuracy milliamp indicator for simultaneous
display of milliamps and pressure.
A typical application for these instruments is for field
calibration of differential pressure transmitters. The
transmitter being calibrated is isolated from the pipe,
the low side vented to atmosphere and the high
transmitter pressure input is connected to a 2121
and a controllable pressure source (like a hand-
pump). The milliamp signal from the transmitter is
then routed through the 2121 milliamps terminals.
The 2121 indicates the actual transmitter milliamp
output versus true applied pressure. Zero, span and
linearity of the transmitter can be field tested and
calibrated with this system.
All 2100 series instruments use a silicon pressure
sensor with a permanently filled oil isolator. Only the
316 stainless steel diaphragm is exposed to to the
applied media, whether it be gas or fluid. This series
was designed to survive high humidity so the
switches are fully sealed and the circuit boards are
conformally coated.
Gauge pressure models (part numbers ending in -G)
measure the difference between atmospheric
(barometric) pressure, and the pressure (or vacuum)
applied to the pressure port. When the pressure
applied is less than the barometric pressure (i.e.,
vacuum) the gauge will indicate negative pressure.
Absolute models (part numbers ending in -A)
measure the difference between an absolute
reference vacuum and the pressure (or vacuum)
applied to the pressure port. Absolute models will
not indicate negative pressure when vacuum is
applied. The pressure being measured can also be either liquid or gaseous, providing
it is compatible with the materials listed in the specification section.