Dome-loaded back pressure regulators require a reference pressure to hold the upstream pressure with a ratio of 1:1 – for high-pressure applications, this can be a challenge. Pressure Control Solutions developed this dual valve electronic pressure controller that allows you to set the reference pressure in a range from 8 to 400 bar gauge.
The valves used in this combination have an internal pressure compensating mechanism, enabling an extremely stable pressure control. The required pressure can be achieved without any overshoot. This helps to minimize the consumption of highly pressurized reference gas. Only when you lower the setpoint, some reference gas will be released into the atmosphere. When processing at a fixed setpoint, the consumption of reference gas is zero. The stability and control rangeability of this electronic pressure controller is unsurpassed.
Just like the ppc dual valve controller, this product is based on the PID controller used in the Bronkhorst El-Press series. To address market demand for an electronic pressure controller that can handle higher pressure ratings without consumption, Pressure Control Solutions developed this product and thus added a 400 bar controller to our portfolio: This 400 bar electronic pressure controller contains a PID controller with two valve drivers, controlling the two proportional Vary-P valves. The pressure in between the valves is monitored by an external sensor.
In this setup, we use an external sensor. This brings several benefits:
Monitoring the reference pressure can be used to create open-loop control, but also closed-loop control.
|Main specifications of the HP-ERC electronic pressure controller summarized
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|Often used in|
|Maximum operating pressure|
|Up to 400 bar
(full-scale range per customer request)
|Minimum differential pressure||6 bar (d)|
|Maximum differential pressure||400 bar (d)|
|Temperature range||-10 up to 70 °C|
|Control stability||0.1% of Full Scale (optional 0.01%)|
|Sensor accuracy||Standard: 0.5% Full Scale
Optional: 0.25% | 0.125% | 0.1%
|Power supply||24 Vdc (215 mA)|
|Fail-safe||Pressure hold – both valves are normally closed|
|Static & dynamic seals||Viton 514162 O-rings and Viton 514162 plunger|
|Tube fitting sizes||1/4” OD compression type|
|Flow coefficient||Inlet valve: 5.0E-5
Outlet valve: 1.0E-4
0…5 (10) Vdc or 0 (4)…20 mA (sourcing output)