Crystal MultiCal BAR/PSI Manual do Utilizador descarregar pdf (Página 4)

PN: 1763 Rev A, 4/2004

Page 4 of 7

PRESSURE is Our BUSINESS

™

Temperature derating:

Range Humidity

28 to 55 °C 0.016% x ( °C -28°)

18to 28 °C No Derating

0 to 18 °C 0.048% x (18° - °C)

-10 to 0 °C 0.264% x (9° - °C)

(Add to Basic Accuracy Speciﬁcation, °C = ambient temperature)

Wetted Materials:

316 stainless steel

General

Weight 230 grams (8.1 oz) w/battery

Overall length 118 mm (4 5/8”)

Pressure Fitting 1/8” NPT

Battery NEDA #1604, 6F22, 006P

Battery Life 400 Hours typ. w/alkaline battery

Output 1mV/unit into 10 Mohm load

Storage -51 to 71 °C

MultiCal Calibration:

A calibration cycle of 1 year is recommended to maintain the MultiCal within speciﬁcations.

Recommended equipment is listed in Table 1.

Table 1 : Recommended Equipment

Instrument Minimum Speciﬁcation Recommended Model

Pressure Standard ± 0.025% of Reading Pressurements

Dead weight gauge

Digital Voltmeter ± 0.025% of reading,

10 Mohm input impedance

Fluke 45

You do not need to use a reference multimeter if the MultiCal will be used with only one

multimeter. In those cases, your overall accuracy may be better if it is calibrated as a set with

the matching multimeter.

The recommended Digital Voltmeter listed in Table 1 has 10MΩ input impedance - as

do many handheld multimeters. Your reference multimeter should have the same input

impedance as the multimeters the module will be used with. In some cases this may mean

that the reference multimeter will need to have its input impedance lowered.

For example, a Flike 8840A is an excellent reference meter but has an input impedance Ω

10000MΩ. If the meters the module will be used with are Fluke 87s, connect a 10MΩ resistor

in parallel with the input to the 8840A.

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Crystal MultiCal BAR/PSI Manual do Utilizador Página 4