P-702CV

Digital Electronic Back Pressure Controllers

Bronkhorst^® model P-702C Back Pressure Controllers (EPCs) are suited for precise measurement and control of upstream pressure ranges between 2…100 mbar and 1,28…64 bar absolute or gauge. The EPC has a well-proven compact thru-flow design and includes a diaphragm type piezo-resistive pressure sensor, a microprocessor based pc-board with signal and fieldbus conversion and a compact, fast acting control valve.

EL-PRESS series are equipped with a digital pc-board, offering high accuracy, excellent temperature stability and fast response. The main digital pc-board contains all of the general functions needed for measurement and control. In addition to the standard RS232 output the instruments also offer analog I/O. As an option, an on-board interface can be mounted to provide DeviceNet™, PROFIBUS DP, Modbus, EtherCAT^®, PROFINET or FLOW-BUS protocols.

Technical specifications

Measurement / control system
Accuracy (incl. linearity and hysteresis)	standard: ±0,5% FS
Repeatability	< 0,1% Rd
Pressure rangeability	1 : 5 (with flow range 1 : 50)
Control stability	≤ ±0,05% FS (typical for 1 ln/min N2 at specified process volume)
Max. Kv-value	6,6 x 10^-2
Operating temperature	-10…+70°C
Temperature sensitivity	0,1% FS/°C
Leak integrity, outboard	tested < 2 x 10^-9 mbar l/s He
Attitude sensitivity	max. error at 90° off horizontal < 0,3 mbar
Warm-up time	negligible

Mechanical parts
Material (wetted parts)	stainless steel 316L or comparable
Process connections	compression type or face seal couplings
Seals	standard: Viton^®; options: EPDM, Kalrez^® (FFKM)
Weight	0,7 kg
Ingress protection (housing)	IP40

Electrical properties
Power supply	+15…24 Vdc
Max. power consumption	Supply 15 V 24 V	at voltage I/O 223 mA 150 mA	at current I/O 223 mA 150 mA
PROFIBUS DP	add 53 mA (15 V supply) or 30 mA (24 V supply)
PROFINET	add 77 mA (15 V supply) or 48 mA (24 V supply)
EtherCAT^®	add 66 mA (15 V supply) or 41 mA (24 V supply)
DeviceNet™	add 48 mA (24 V supply)
Analog output/command	0...5 (10) Vdc or 0 (4)…20 mA (sourcing output)
Digital communication	standard: RS232; options: PROFIBUS DP, DeviceNet™, PROFINET, EtherCAT^®, Modbus RTU or ASCII, FLOW-BUS

Electrical connection
Analog/RS232	9-pin D-connector (male);
PROFIBUS DP	bus: 9-pin D-connector (female); power: 9-pin D-connector (male);
Devicenet™	5-pin M12-connector (male);
EtherCAT^®/ PROFINET	2 x RJ45 modular jack (in/out)
FLOW-BUS/Modbus-RTU/ASCII	RJ45 modular jack

Note: The measuring cell of the pressure sensore is separated from the external pressure by a thin, sensitive stainless steel diaphragm, and the sealed off cavity between diaphragm and cell is filled with oil. Since the standard oil filling is flammable, Bronkhorst advises to take precautions when oxygen or any other explosive fluid is used.

Technical specifications subject to change without notice.

Downloads

Brochures
EL-PRESS brochure

Manuals
General manual digital instruments
Operating instructions digital instruments

Hook-up diagrams
Analog IO - RS232
DeviceNet
EtherCAT
FLOW-BUS
Modbus
Optional Bus and IO Configurations
PROFIBUS DP
PROFINET

Dimensional drawing
P-702CV_P-712CV

EL-PRESS P-702CV (P1-Control)

Digital Electronic Back Pressure Controllers

Technical specifications

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