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The Cerabar M pressure transmitter measures the pressure of gases, vapours and liquids and is used in all areas of chemical and process engineering. Operating principle Ceramic sensor The system pressure acts directly on the rugged ceramic diaphragm of the pressure sensor deflecting it by a maximum of 0.025 mm (0.0098 in). A pressure-proportional change in the is measured by the electrodes on the ceramic substrate and diaphragm. The measuring range is determined by the thickness of the ceramic diaphragm.
Metal sensor
The process pressure deflects the separating diaphragm with a filling liquid transmitting the pressure to a resistance bridge. The bridge output voltage, which is proportional to pressure, is then measured and processed.
The process pressure deflects the separating diaphragm with a filling liquid transmitting the pressure to a resistance bridge. The bridge output voltage, which is proportional to pressure, is then measured and processed.
The complete measuring system consists of
· Cerabar M pressure transmitter with 4…20 mA signal output with superposed digital signal (HART communication) and power supply 11.5…45 VDC, in Ex area 11.5…30 VDC.
· Cerabar M pressure transmitter with 4…20 mA signal output with superposed digital signal (HART communication) and power supply 11.5…45 VDC, in Ex area 11.5…30 VDC.
Operation can be carried out via:
· a digital display for operating and calling up measured values locally,
· the universal handheld HART Communicator DXR 275,
· the Endress+Hauser Commuwin II operating program.
· a digital display for operating and calling up measured values locally,
· the universal handheld HART Communicator DXR 275,
· the Endress+Hauser Commuwin II operating program.
electrical Connection
Transposed, screened two-wire cabling is recommended for the connecting cable. Max. wire diameter: 2.5 mm2 permanently attached cable The power supply voltage is:
· Non-Ex: 11.5…45 VDC
· Ex i area: 11.5…30 VDC
Internal protection circuits against reverse polarity, HF interference and overvoltage peaks (see TI 241F "EMC Guidelines"). A test signal can be measured using the terminal plugs for this purpose without interrupting measurement. Cable connection · Unscrew the cover
· If present, remove the retainer ring with analogue display. In addition:
– Push up the latch with the arrow until the grip of the retaining ring is audibly released.
– Loosen the retainer ring carefully to prevent the display cable from breaking. The plug of the display can remain plugged in.
· Insert the cable through the cable entry
· Connect the cable wires as shown in the connection diagram.
· Where appropriate, replace the retainer ring with analogue display. The grip of the retainer ring clips in with an audible click.
· Screw down the cover
Transposed, screened two-wire cabling is recommended for the connecting cable. Max. wire diameter: 2.5 mm2 permanently attached cable The power supply voltage is:
· Non-Ex: 11.5…45 VDC
· Ex i area: 11.5…30 VDC
Internal protection circuits against reverse polarity, HF interference and overvoltage peaks (see TI 241F "EMC Guidelines"). A test signal can be measured using the terminal plugs for this purpose without interrupting measurement. Cable connection · Unscrew the cover
· If present, remove the retainer ring with analogue display. In addition:
– Push up the latch with the arrow until the grip of the retaining ring is audibly released.
– Loosen the retainer ring carefully to prevent the display cable from breaking. The plug of the display can remain plugged in.
· Insert the cable through the cable entry
· Connect the cable wires as shown in the connection diagram.
· Where appropriate, replace the retainer ring with analogue display. The grip of the retainer ring clips in with an audible click.
· Screw down the cover
Connecting the handheld terminal
· Do not replace the battery of the handheld terminal in the explosion hazardous area.
· For a Cerabar M with FM or CSA certificate: Electrical connection according to "Installation
drawing" (enclosed in the packing of the Cerabar M).
· For correct transmis sion of the communication signal, a minimum resistance of 250 W must be present between the connection points and the power supply. The Commubox FXA 191 connects the Cerabar M with a HART protocol to the RS 232 C serial interface of a personal computer. This enables the Cerabar M to be remotely operated with the Endress+Hauser operating program. The Commubox FXA 191 is used for intrinsically safe signal circuits.
· For correct transmis sion of the communication signal, a minimum resistance of 250 W must be present between the connection points and the power supply. The Commubox FXA 191 connects the Cerabar M with a HART protocol to the RS 232 C serial interface of a personal computer. This enables the Cerabar M to be remotely operated with the Endress+Hauser operating program. The Commubox FXA 191 is used for intrinsically safe signal circuits.
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