Crystal MultiCal BAR/PSI - Manual (Page 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.