Process monitoring system with plastic surface and inputs forhumidity, temperature or external pressure transmitters

Special features

• High level of accuracy and long-term stability throughautomatic zero-point calibration
• Easy configuration of the measuring range, analog output, timeconstants and units via keyboard or RS 232 (optional)
• PROFIBUS DP interface (optional)
• Graphic LCD display
• 2 floating switching relays 
• Selectable output signal 0 .. 10 V or 0/4 ... 20 mA
• Selectable attenuation of the output signal from 0 .. 40 s
• Acoustic alarm when the threshold value is out of range, acknowledgement via key
• Calibration via calibration inputs led out of the front plate(optional)
• Two additional pressure connectors, accessible from the front, for easy onsite calibration (PUC 28 K)
• Highly stable measurements thanks to cyclical self-calibration of the zero point
• High level of overpressure protection even in the smallestmeasuring ranges protects the instrument against pressure peaks orincorrect operation
• Scaleable measurement range offers increased measurementaccuracy

The PUC 28 process monitoring system is especially suitable forpressure monitoring applications in cleanrooms, laboratories, pharmaceutical plants and operatingtheatres. The system has two electrical inputs for humidity, temperature or external pressuretransmitters. The measurement values provided by these devices are displayed on the graphic LCD display. As wellas recording differential pressure, it also measures positive and negative overpressure and is freelyscalable within the measuring range. Two optional contact points allow the user to connect visual oraudible alarms that are triggered any time values rise above or fall below specified limits. These threshold values can be set as parameters both for the internal differential pressure sensor and for the externalhumidity, temperature or pressure transmitter. The transmitter can be configured easily via an RS 232 interface(optional) with software. This can also be performed using a keyboard and display. A selectable timeconstant allows the transmitter to be adjusted perfectly to the pressure conditions and thus ensures a stableoutput signal.

The PUC 28 is suitable for wall mounting in cleanrooms due toits smooth, solvent-resistant plastic surface. The device is easily integrated into central building controlsystems via the optional PROFIBUS DP interface. In this case, the Profibus connection acts as a gateway for theanalogue signals from the external transmitters, which thus require no PROFIBUS DP interface oftheir own. Calibration ports are available on the front of the instrument for on-site calibration (optionalwith the PUC 28 K). There is therefore no need to remove the instrument from its position on-site.