Crystal 2100 User Manual
2100 Operation Manual
Introduction
Crystal Engineering 2100 Series Pressure Gauges
and Calibrators measure almost any type of pneumatic 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 handpump). 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.
PN: 2102
8/01
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PRESSURE is Our BUSINESS
TM
Operating Instructions
To ensure safe and accurate operation, please be familiar with the following operations and
functions.
WARNING:
SEVERE INJURY OR DAMAGE CAN OCCUR THROUGH IMPROPER USE OF PRESSURE
INSTRUMENTS. Do not exceed recommended pressure limits of tubing and fittings. Be certain
all pressure connections are secured. Do not rely on the display indication before disconnecting - it
may not be indicating true pressure.
relieving system pressure.
CAUTION:
NEVER INSERT ANY OBJECT (other than 1/8″ NPT fittings) INTO THE PRESSURE CONNECTIONS!
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 appropriate solvents only.
The pressure being measured can be either liquid or gaseous, providing it is compatible with the
materials listed in the specification section. PTFE (polytetrafluoroethylene) tape should be used
with any 1/8″ male NPT fittings installed into the aluminum manifold.
Operating Instructions
The pressure indication must be set to zero without any pressure being applied to the inlet. The
zero adjustment affects all the ranges, but the most precise adjustment is achieved while
monitoring the meter on the 200″H2O range (or the most sensitive range). Turn on the instrument and allow it to warm up for about 1 minute. Using a small screwdriver, adjust the trimming
potentiometer marked
the reading.
Absolute Only:
ZERO
Do not reset zero unless a full vacuum is applied to the meter. If you
are using the gauge for measurements close to barometric pressure,
you may use the zero adjustment to trim in the gauge’s barometric
reading as compared to a precision barometric standard.
Never disconnect pressure instrumentation without first
. Turning the trimming potentiometer counter-clockwise will reduce
The 2100 has two 1/8″ female NPT ports. Two ports are provided so that additional tees should
not be required. We recommend the following when installing fittings:
1. Make sure the ports are free from debris.
2. Select appropriate fittings. Thread sealant must be used. Tighten the fitting into the
pressure port. Use an adjustable wrench on the inlet port manifold to minimize stress on
the case. Do not tighten any more than is necessary to insure a leak-free connection.
Maximum pressure on any instrument is 3 times the highest range. The transducer will not be
damaged when exposed to an overpressure condition within the limits specified, and will not
have to be recalibrated to maintain rated accuracy. Zero may have to be readjusted, however.
PN: 2102
8/01
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Milliamp Meter
To measure milliamperes, connect any standard test leads (with 4mm banana plugs) to the jacks
on the right side of the meter. The meter meets accuracy specifications with the leads
connected in either polarity. The top jack (red, adjacent to the strap) is the positive input
terminal.
The milliamp meter is internally fused with a replaceable glass, 2 amp, 8 AG fuse. Should the
fuse require replacement, follow the instructions of step 6 in the calibration procedure for panel
removal, then pry out and replace the glass fuse.
Battery Replacement
Replace the battery once a Low Battery indicator becomes visible. The battery warning
indicates the battery is exhausted, and the instrument may no longer be accurate. The 2100
operates on one 9V battery, either carbon-zinc (included) or alkaline. To install the battery, open
the cover of the instrument. Turn the power switch off. Open the battery compartment by lifting
up the tab on the right side of the gauge. Plug the battery into the polarized snap connector.
The power switch must be off when installing the battery, to avoid
!
CAUTION
momentarily connecting the battery in reverse polarity. REVERSE
BATTERY POLARITY WILL DESTROY THE GAUGE IMMEDIATELY.
PRESSURE is Our BUSINESS
PN: 2102
TM
8/01
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