Asynt – Digital Electronic Pressure Meter

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The Bronkhorst Digital Electronic Pressure Meter range are suited for precise measurement of pressure ranges between 2…100 mbar and 1,28…64 bar absolute or between 0,7…35 mbar and 1,28…64 bar gauge. These transducers (or EPT) have a well-proven compact thru-flow design….

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EL-PRESS P-502C

The Bronkhorst Digital Electronic Pressure Meter range are suited for precise measurement of pressure ranges between 2…100 mbar and 1,28…64 bar absolute or between 0,7…35 mbar and 1,28…64 bar gauge. These transducers (or EPT) have 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 PID controller for optional pressure control by means of a separately mounted 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, POWERLINK or FLOW-BUS protocols.

Key features of the digital electronic pressure meter include:

  • For absolute or gauge pressure
  • High accuracy and repeatability
  • Well proven, compact thru-flow design
  • On-board PID controller for pressure control
  • Analog, RS232 and fieldbus communication

How does it work?

The Bronkhorst EL-PRESS pressure sensor is a piezoresistive bridge on the surface of a silicon chip. This chip is drilled out on its reverse side, giving the inside of the chip the form of a pressure diaphragm, whose thickness determines the pressure range. When a pressure acts on this chip, the diaphragm flexes, and the resistor values of the bridge alter in proportion to the pressure. The measuring cell 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.

Other models/specifications are also available.

Specification

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 1:50 for pressure meter;
1 : 20 for P2-control; 1 : 5 for P1-control
Response time (sensor) msec
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 (VCR/VCO) couplings
Seals standard: Viton®;
options: EPDM, Kalrez® (FFKM), FDA and USP Class VI approved compounds
Weight 0,4 kg
Ingress protection IP40

Electrical Properties

Power supply +15 … 24 Vdc
Max. power consumption meter
Supply
15 V
24 V
at voltage I/O
95 mA
65 mA
at current I/O
125 mA
85 mA
extra for fieldbus
<75 mA
<50 mA
Max. Power consumption controller
Supply
15 V
24 V
at voltage I/O
290 mA
200 mA
at current I/O
320 mA
215 mA
extra for fieldbus
<75 mA
<50 mA
Analog output 0…5 (10) Vdc or 0 (4)…20 mA (sourcing output)
Digital communication standard: RS232;
options: CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or 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);
CANopen® / DeviceNet™ 5-pin M12-connector (male);
FLOW-BUS/Modbus-RTU/ASCII RJ45 modular jack
Modbus TCP / EtherNet/IP / POWERLINK 2 x RJ45 modular jack (in/out);
EtherCAT®/ PROFINET 2 x RJ45 modular jack (in/out);

Please Note:

The measuring cell of the pressure sensor 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.

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