WIKA CPG2500 - Manual (Page 63)

Mensor/WIKA Operating Instructions Series CPG 2500 63
Digital Pressure Gauge
SERIES CPG 2500
8. Options
• Barometric Reference Transducer
• Barometer
• Analog Output
• IEEE-488 (see “7.1.4 - IEEE-488” in Section 7, Remote Operation)
• Rack Mount Kit (optional accessory)
8.1 Barometric Reference Transducer
The Barometric Reference Transducer is a very stable, absolute pressure sensor used to
accurately measure local atmospheric pressure.
The CPG 2500 uses the barometric pressure measured by the installed barometric ref-
erence sensor in both channels and allows pressure type emulation on both channels.
8.1.1 Gauge Pressure Emulation
On absolute units set the CPG 2500 for gauge pressure measurement by touching the
Channel Setup key, then the sensor tab, press [gauge], and then touch the back key.
The operation screen now shows units ‘GE’ in place of units ‘A’. The “GE” indicates that
the measurement and control values are in gauge emulation pressure units.
In the gauge emulation mode the atmospheric pressure reading from the barometric ref-
erence transducer is subtracted from the absolute pressure reading of the active chan-
nel 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 resolution of the barometric reference.
Emulation mode uncertainty is the combined uncertainty of the barometric reference
transducer and the active transducer.
8.1.2 Absolute Pressure Emulation
On gauge units set the CPG 2500 for absolute pressure measurement by touching the
Channel Setup key, then the sensor tab, press [absolute], and then touch the back key.
The operation screen now shows units ‘AE’ in place of units ‘G’. The “AE” indicates that
the measurement and control values are in absolute emulation pressure units.