Crystal MultiCal KPA/PSI - Manual

PN: 1763 Rev C, 4/2004
Page 1 of 8
C R Y S T A L
engineering corporation
MultiCal Instruction Sheet
kPa/PSI Pressure Module
Introduction
MultiCal pressure modules are used to measure pneumatic or hydraulic pressures. They can
also be used to measure vacuum.
MultiCal modules don’t display
pressure, since they only have
an electrical output. Instead, the
modules convert pressure to
millivolts. Modules are used with
devices capable of measuring
DC millivolts, such as a digital
multimeters or oscilloscopes.
MultiCals are calibrated to convert
pressure units (for this model, inches kPa
or PSI) to 1 millivolt per pressure unit. Vacuum
readings will of course be negative.
Pressure is measured by connecting an appropriate fitting to one of the two
1 /
8
″ female NPT
ports (plug any unused port). Any gas or liquid compatible with 316 stainless steel, PTFE
(polytetrafluoroethylene) impregnated hard anodized aluminum, and buna-n rubber, can be
applied to the module as the pressure source.
The three-position switch acts as a power switch as well as selecting kPa or PSI scaling
for the output. The OFF position is used to measure the internal battery condition via an
external multimeter.
MultiCal modules perform best when used with high accuracy multimeters. We recommend
meters manufactured by the Fluke Corporation, but MultiCals can be used with any meter
that has 10MΩ or greater input impedance, and (preferably) 4mm banana jacks on 19mm
(
3 /
4
″) centers.
When used with a high performance multimeter, the pressure adapter becomes more
than just a “digital pressure gauge”. By using the features built-in to the Fluke 87 for
example, the system becomes a datalogger capable of measuring and recording peak high,
peak low and average pressures.
This manual includes instructions for calibrating the module itself, but we also offer repair,
calibration/certification services. MultiCals are manufactured (and serviced) by a company
that only makes pressure measuring instruments. It’s the only thing we do and that’s why we
say:
Pressure is Our Business!
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