The Auto Back Pressure Unit works with Scribner Associates’ 840, 850 and 890 Fuel Cell Test Systems for accurate, independent control and measurement of anode and cathode pressure through the FuelCell® software.
Features
- Automatic control of back pressure from 10 to 300 kPag (1.5 to 44 psig)
- All stainless steel construction - regulators, condensate collection tanks, tubing and fittings
- Dual channel with isolated flow paths & fan-cooled heat exchangers
- High-precision, water-tolerant regulators and large flow paths
- Accurate pressure control (±3.5 kPa or 0.5 psi) & stability from 0.1 – 10 SLM
- Precision pressure transducers
- Operation with gas with dew point up to 99 °C at 10 SLM
- Flexible pressure control through FuelCell®
- Independently control or balance anode & cathode pressure
- Control excess gas flow during pressure increases
- Maximum back pressure & differential pressure set points and alarm triggers
- Program pressure profiles using Setup Fuel Experiment or Arbitrary Control Experiment
Specifications
Back Pressure Control 10 – 300 kPag (1.5 – 44 psig)
Control Accuracy ±3.5 kPa (±0.5 psi)
Range 0 - 300 kPag (0 – 44 psig)
Measurement Accuracy 2.5 kPa (0.35 psi)
Time to achieve normal P-to-P Set-point < 10 s
(when not flow rate limited)
Overshoot < 10 kPa (1.5 psi)
Flow Rate 0.1 - 10 SLPM
Inlet Gas Temperature & Dew Point Up to 99 °C
Pilot Gas Supply Clean, dry air or N2, 345-480 kPa (50-70 psi), ≤0.8 SLPM
Dimensions 33 W x 33 D x 64 H (cm), 13 W x 13 D x 25 H (inch)
Operating Temperature 5 - 35 °C
Power Requirements 100 - 240 V, 50 - 60 Hz, 2 A
Typical system and control back pressure (left), and pressure differential (right) as a function of flow rate
Typical pressure overshoot (System – Control) vs. flow rate at low (35 kPa) and high (310 kPa) system back pressure
See also:
