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

Digital Electronic Back Pressure Controller

  • Back pressure control (controls upstream pressure "P1")
  • For absolute or gauge pressure
  • High accuracy and repeatability
  • Well proven, compact thru-flow design
  • Compact design with on-board PID controller and direct acting control valve
  • Analog, RS232 and fieldbus communication
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EL-PRESSP-702CV (P1-control)

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  20…100 mbar and 12,8…64 bar absolute or between 7...35 mbar and 12,8...64 bar 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 CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP or FLOW-BUS protocols.

Technical specifications

Measurement / control system
Absolute pressure sensors Code: 350A  -  Ranges (FS): 100 ... 350 mbara  -  P-max: 1,0 bara  -  Burst pressure: 1,4 bara
Code: 1K1A  -  Ranges (FS): 0,35 ... 1,1 bara  -  P-max: 3,1 bara  -  Burst pressure: 4,2 bara
Code: 6K0A  -  Ranges (FS): 1,1 ... 6 bara  -  P-max: 10,5 bara  -  Burst pressure: 14 bara
Code: 21KA  -  Ranges (FS): 6 ... 21 bara  -  P-max: 62 bara  -  Burst pressure: 84 bara
Code: M10A  -  Ranges (FS): 20 ... 100 bara  -  P-max: 200 bara  -  Burst pressure: n.a.
Relative pressure sensors Code: 100R  -  Ranges (FS): 35 ... 100 mbarg  -  P-max: 0,7 barg -  Burst pressure: 0,8 barg
Code: 350R  -  Ranges (FS): 100 ... 350 mbarg  -  P-max: 1,0 barg  -  Burst pressure: 1,4 barg
Code: 1k1R  -  Ranges (FS): 0,35 ... 1,1 barg  -  P-max: 3,1 barg  -  Burst pressure: 4,2 barg
Code: 6K0R  -  Ranges (FS): 1,1 ... 6 barg  -  P-max: 10,5 barg  -  Burst pressure: 14 barg
Code: 21KR  -  Ranges (FS): 6 ... 21 barg  -  P-max: 62 barg  -  Burst pressure: 84 barg
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
290 mA
200 mA
at current I/O
320 mA
215 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.

For dimensional drawings and hook-up diagrams please visit the product page on our website


EL-PRESS brochure

Quick installation guide EL-PRESS

Hook-up diagrams
Analog IO - RS232
Optional Bus and IO Configurations

Dimensional drawing

Bronkhorst High-Tech B.V.

Nijverheidsstraat 1A
NL-7261 AK Ruurlo (NL)
Tel. +31 573 45 88 00
[email protected]

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