Crystal MultiCal Pressure Module User Manual
MultiCal
Operation Manual
for MultiCal H2O/PSI Pressure Module
Contents
Overview.................................................................1
Introduction ..............................................................1
Operation................................................................2
Functions .................................................................2
Pressure Measurement ....................................................3
Battery Replacement ......................................................3
Calibration ..............................................................4
Recommended Equipment .................................................4
Calibration Procedure .....................................................4
Specifications .........................................................6
Pressure ...................................................................6
Operating Environment ....................................................6
Temperature Derating .....................................................7
General Specications .....................................................7
EC Declaration of Conformity ...............................................8
Support ..................................................................9
Contact Us ................................................................9
Factory Service ............................................................9
Trademarks ...............................................................9
Warranty ..................................................................9
Overview
INTRODUCTION
MultiCal pressure modules are used to measure pneumatic or hydraulic pressures. They can also be used to measure vacuum.
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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.
Overview 1
This MultiCal is calibrated to convert pressure units (inches H
Pressure is measured by connecting an appropriate tting to one of the two 1/8" female NPT ports, while plugging any unused port. Any gas or liquid com-
patible with 316 stainless steel, PTFE (polytetrauoroethylene) impregnated hard anodized aluminum, and buna-n rubber, can be applied to the module as
the pressure source.
The three-position switch is used to power on the unit and to select inches H
battery condition via an external multimeter.
MultiCal modules perform best when used with high accuracy multimeters. The MultiCals can be used with any meter that has 10MΩ or greater input imped-
ance, and (preferably) 4mm banana jacks on 19mm (3/4") centers.
rystal Engineering is the company that designs, manufactures, markets, and services the MultiCal, nVision, XP2i, 30 Series, M1, and a variety of industry spe-
C
cic pressure measuring equipment. Crystal Engineering pioneered features like full temperature compensation and “of reading” rated gauges and calibrators.
ressure measuring equipment is the only thing we do and that’s why we say:
P
™
O or psi) to 1 millivolt per pressure unit. Vacuum readings will be negative.
2
O or psi scaling for the output. The OFF position is used to measure the internal
2
MultiCal H2O/PSI Pressure Module Manual
Operation
FUNCTIONS
To ensure safe and accurate operation, please be familiar with the following operations and functions.
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WARNING: Severe injury or damage can occur through improper use of pressure instruments! Do not exceed recommended pressure limits of
!
CAUTION: Never insert any object (other than a 1⁄8" NPT tting) into the inlet ports. The sensor diaphragm is very thin and can be damaged or
!
T
he internal pressure sensor measures the dierence 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 specication section.
PTFE tape should be used with any ttings 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 specication of the MultiCal, or refer to the Calibration section of this manual for other methods
of eliminating the error introduced by an impedance mismatch.
tubing and ttings. Be certain all pressure connections are secured. Never disconnect pressure instrumentation without rst relieving
sy
stem pressure.
destroyed by solid or sharp objects. Clean the sensor with appropriate solvents, only.
Operation 2
MultiCal H2O/PSI Pressure Module Manual
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