Crystal 2100 Series - Manual (Page 2)

PN: 2102
8/01
Page 2 of 8
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.
Never disconnect pressure instrumentation without first
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
″H
2
O range (or the most sensitive range). Turn on the instru-
ment and allow it to warm up for about 1 minute. Using a small screwdriver, adjust the trimming
potentiometer marked
ZERO. Turning the trimming potentiometer counter-clockwise will reduce
the reading.
Absolute Only: 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.
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.