mensor CPG2500, Руководство по эксплуатации

Страница: 62 / 86

62 Operating Instructions - CPG2500
Precision Pressure Indicator
CPG2500
8 Options
• Barometric Transducer Channel
• Barometric Reference (for gauge and absolute emulation)
• External Transducers (CPT6100 and CPT6180)
• External Sensor Package (rear plate with D-Sub and cable)
• Analog Output
• Rack Mount Kit
• Fittings
• Remote calibrations sleds (transducers, Barometric reference)
8.1 Barometer
The CPG2500 can be ordered as a single range Barometer. It is a very stable, absolute pressure sen-
sor, used to accurately measure local atmospheric pressure. The only significant difference between a
barometer and a regular transducer is that the transducer in a Barometer is calibrated from 8 to 17 psia
and has an accuracy of 0.01% of reading. The channel setup information as explained in this manual also
applies to the Barometer. It cannot, however, be used as a barometric reference for Gauge or Absolute
emulation.
8.2 Barometric Reference
The Barometric Reference Transducer is an absolute pressure sensor used to accurately measure local
atmospheric pressure. This sensor is in a different housing compared to the regular transducers. It is
removable by taking off the top cover of the chassis.
The CPG2500 uses the barometric pressure, measured by the barometric reference, for pressure mode
emulation in the internal and external transducer channels. If a barometric reference is installed the Pres-
sure Mode button in the measure application (main screen) will become active and, when pressed, will
toggle between Absolute and Gauge mode (See section 6.4.1 Measure Application).
8.1.1 Gauge Pressure Emulation
In the Measure Application (main screen) an absolute transducer channel will indicate “Absolute” in the
mode button (this is the default mode). When this button is pressed the button label will toggle to “Gauge”
and have a lighter background color. The lighter background color is an indication that the channel is in
emulation mode.
In the gauge emulation mode the atmospheric pressure reading from the barometric reference transduc-
er is subtracted from the absolute pressure reading of the channel to emulate a gauge pressure.
The barometric reference sensor has six significant digits. If a very low pressure gauge sensor is active
and is used in absolute emulation, the combined output may appear quite noisy because of the resolu-
tion of the barometric reference.
8.2.1 Absolute Pressure Emulation
In the Measure Application (main screen) a gauge transducer channel will indicate “Gauge” in the mode
button (this is the default mode). When this button is pressed the button label will toggle to “Absolute” and
have a lighter button background color. The lighter background color is an indication that the channel is in
emulation mode.
In the absolute emulation mode the atmospheric pressure reading from the barometric reference trans-
ducer is added to the gauge pressure reading of the active channel to emulate an absolute pressure.