Appendix : Cp 440 Calibration Procedure - Ecom Instruments CP 440 Instruction Manual

Environmental
Operating Temperature -0 °C to +55 °C (4°F to 3°F)
Storage -20 °C to +70 °C (-4 °F to +58 °F)
Mechanical
Dimensions 4.5" (diameter) x 2.2" (depth) x 5" (height)
Pressure Connection: ⁄4" NPT Male
Housing: Stainless steel, meets NEMA 4/IP65
Display
5-/2 Digits, 0.65" (6.53 mm) high
20-Segment bar graph, 0 to 00%
Power
Battery three (3), size AA alkaline batteries, optional 24 VDC power.
Battery Life ,500 hours without backlight
2,000 hours at slow sample rate
Low Battery Indicator icon is displayed near the end of battery life
Approvals
CE approved
6. Appendix 1: CP 440 Calibration Procedure
Overview
Calibration adjustment of the CP 440 is performed electronically ´ v ia inter-
nal software with the case closed. There are no mechanical adjustments;
all calibration commands and adjustments are done via the keypad, using
the display to guide the user through the calibration process.
Eight calibration points are used in the adjustment program, working from
full scale to zero at pressures equaling 00%, 87.5%, 75%, 62.5%, 50%,
37.5%, 25%, 2.5%, and 0% of full scale plus vacuum.
Note: This is an ambient temperature calibration, and should be perfor-
med at an ambient temperature of 23°C ± 3°C (72° F ± 5° F). Calibration
outside this temperature range will invalidate the temperature compensa-
tion program in the CP 440.
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