Electronic Pressure Controller, Back Pressure - Model 425

425 The Parker Model 425 electronic pressure regulator combines the proven Parker EPC electronic proportional control valve with an integrally-mounted pressure sensor and the necessary electronics for self-contained closed-loop pressure control. Model 425 permits regulation of back (i.e. upstream) pressure. The controlled pressure is established by a user-applied 0-5 Vdc setpoint voltage.


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Models 415 and 425: Electronic Pressure Regulators

Parker Models 415 and 425 Electronic Pressure Regulators combine the proven Parker EPC Proportional Control Valve with an integrally-mounted pressure sensor and the necessary electronics for self-contained closed-loop pressure control. Models 415 and 425 permit regulation of forward and back pressures respectively. The controlled pressure is established by a user-applied 0-5 Vdc setpoint voltage.

The exclusive absolute zero (ABZ) feature allows the pressure signal to be essentially clamped at zero for signals less than 1.5% full scale, which in turn forces the control valve closed. ABZ minimizes the zero drift effects due to temperature variation and guarantees the control valve will not open for setpoint values less than 1.5% full scale. When pressure is adjusted to greater than 1.5% full scale, the pressure signal is enabled and calibrated accuracy is achieved. The ABZ feature may be disabled by means of a control input at the electrical connector.

SPECIFICATIONS

PERFORMANCE (performance specifications at 20°C, 100 PSIG inlet pressure and +15 Vdc power supply voltage unless otherwise noted)
Gases Accommodated
Any clean, dry gas compatible with materials of construction
Maximum Inlet Pressure
PRESSURE RANGE MAXIMUM INLET
PRESSURE PRESSURE RANGE MAXIMUM INLET PRESSURE
0-5 PSIG 15 PSIG 0-30 PSIG 90 PSIG
0-10 PSIG 45 PSIG 0-50 PSIG 150 PSIG
0-15 PSIG 45 PSIG 0-100 PSIG 200 PSIG
Pressure Regulation Accuracy
±1.5% F.S.
Pressure Regulation Linearity
±1% F.S.
Repeatability
±0.25% F.S.
Temperature Coefficient
±0.1% F.S./°C maximum
Pressure Signal Zero Shift
ABZ ENABLED: <0.1% F.S. over 0-50°C range
ABZ DISABLED: <1% F.S. over 0-50°C range
Valve Inboard Leak Rate
0.2 SCCM He @ 90 PSIG

ELECTRICAL
Pressure Signal Output
0-5 Vdc for 0 to full scale pressure range (pressure signal output forced to 0 Vdc whenever less than 1.5%
F.S. [75 mV] and ABZ is enabled)
Setpoint Input
0-5 Vdc for 0 to full scale pressure range
Power Supply Voltage
+12 to +24 Vdc (±10%)
Maximum Operating Power @ +16.5 Vdc
2.25 watts (150 mA max. from +15 Vdc supply)
ABSOLUTE ZERO (ABZ) Input
Enable ABZ = No connection
Disable ABZ = 0V (threshold <3.0 Vdc)

MECHANICAL
Dimensions
Refer to DIMENSIONAL DATA section
Mounting Orientation
Attitude insensitive
Electrical Connector
8-contact (mating connector - AMP P/N 640441-8)
Process Connections
1/16”, 1/8” or 1/4” compression fittings

MATERIALS OF CONSTRUCTION
Body
Aluminum
Pressure Sensor Assembly
Pyrex®, ceramic, silicon, epoxy, RTV and stainless steel
Orifice
Brass
Valve Components (Wetted)
Aluminum, brass, 302 Stainless Steel, 305 Stainless Steel, 316 Stainless Steel, 430 Stainless Steel and Sandvik® 1802
Elastomers (O-rings and Valve Seat)
Buna N, EPDM, Neoprene or Viton®
Process Connections
Brass or 316 SS

ENVIRONMENTAL
Operating Temperature
0 to 50°C (32 to 122°F)
Storage Temperature
-17 to 75°C (2 to 167°F)
Packaging
Individually packaged in lint-free bags for storage

Pyrex® - Corning Inc.
Sandvik® - AB Sandvik Materials Technology
Viton® - DuPont Dow Elastomers L.L.C.
Specifications subject to change

MATERIALS OF CONSTRUCTION
Body
Aluminum
Pressure Sensor Assembly
Pyrex®, ceramic, silicon, epoxy, RTV and stainless steel
Orifice
Brass
Valve Components (Wetted)
Aluminum, brass, 302 Stainless Steel, 305 Stainless Steel, 316 Stainless Steel, 430 Stainless Steel and Sandvik® 1802
Elastomers (O-rings and Valve Seat)
Buna N, EPDM, Neoprene or Viton®
Process Connections
Brass or 316 SS

ORDERING INFORMATION
To order, please specify
• Model number
• Body/orifice/process connection materials
• Elastomer material
• Process connection size and type
• Flow capacity
• Gas type
• Operating temperature
• Pressure range
• Upstream pressure
• Downstream pressure
• Process volume under pressure control

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