Crystal MultiCal KPA/PSI - Manual (Page 2)

PN: 1763 Rev C, 4/2004
Page 2 of 8 PRESSURE is Our BUSINESS ™
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. Never disconnect pressure instrumentation without first relieving
system pressure.
CAUTION:
Never insert any object (other than a 1 ⁄
8
″ NPT fitting) into the inlet ports. The sensor
diaphragm is very thin and can be damaged or destroyed by solid or sharp objects. Clean
the sensor with appropriate solvents, only.
The internal pressure sensor measures the difference between atmospheric (barometric)
pressure, and the pressure (or vacuum) applied to the pressure port. The pressure being
measured can be either liquid or gaseous, providing it is compatible with the materials listed
in the specification section.
PTFE tape should be used with any fittings installed into either of the
1 ⁄
8
″ female NPT ports.
Two ports are provided so that additional tees should not be required. Plug any unused
ports.
MultiCals have been calibrated for use with meters that have 10MΩ input impedance, as do
most handheld meters, and some benchtop multimeters. If your meter has higher or lower
input impedance, add 0.1% to the specification of the MultiCal, or refer to the Calibration
section of this manual for other methods of eliminating the error introduced by an impedance
mismatch.
Pressure Measurement
Follow this procedure to correctly use the MultiCal pressure module.
1. Plug the MultiCal directly into the voltage input terminals of the multimeter or with the
patch cord set. The patch cord set consists of a 48″ cord with double banana plugs
on each end and a double banana jack splice. Plug the splice into the MultiCal and
the patch cord into the splice. Plug the other end of the patch cord into the multimeter.
Polarity is marked on the MultiCal and on the patch cord and splice.
2. Set the multimeter to the millivolt (DC) range.
3. Check the battery condition: With the MultiCal still in the OFF position, the
multimeter must indicate a minimum reading of 100 mV. Readings less than 100 mV
indicate the battery must be replaced. To be sure that your pressure measurements are
accurate, always check the battery condition first, and replace the battery if necessary.
4. Turn on the MultiCal by sliding the switch to the range you intend to use.