TEST SYSTEM OPTION

Mass Flow Controllers (MFC) have a 1 part in 100 accuracy. To provide a high accuracy over a wide dynamic range (particularly in low flow ranges) the MFCs can be paired to provide a high and low flow range with much better precision.
When coupled with the PowerStation™, the PS-DR™ gas management unit enables fuel cell and the testing of wide ranging reactant gas mixtures for PEM, alkaline, and phosphoric acid fuel cells. It provides capacity for small single cells and to fuel cell stacks.

 

Key Features:

  • Software control supports enhanced gas flow control by “teaming” large and small mass flow controller “pairs”
  • precision automated gas supply, product water collection and effluent management
  • convenient front panel access to manual controls, and output and return gas fittings
  • safety designed in through hardware features and software control

 

Gas Management Module:

  • up to 50 psig operation
  • manual backpressure regulators
  • NEMA rated solenoid valves
  • normally closed on reactant lines (for safety)
  • normally open on purge lines (for safety)
  • reactant lines separated by leak-free solenoid valves
  • strategically located check valves prevent back-flow of reactant gases
  • two fuel gas lines
  • two oxidant gas lines
  • precision, all stainless steel mass flow controlers (same as those used in the semiconductor industry)
  • under programmed control of the PowerStation™
  • gas flow accuracy +/- 1 % of full scale
  • gas flow precision +/- 0,2 % of full scale
  • gas flow resolution 0,1 % of full scale
  • seamless stainless steel tubing throughout
Dual Range Image 1

 

Electronic Load:

• power:
800 Watt (8″ x 5,25″ x 22″ W x H x D; approx. 40kg)
2000 Watts (19″ x 5,25″ x 22″ W x H x D)
4000 Watts (19″ x 8″ x 22″ W x H x D)
• selectable voltage:
0 – 10, 0 – 20 and 0 – 50 Volt
• selectable current:
0 – 2, 0 – 20 and 0 – 150 A
• constant current and voltage mode:
- accuracy: ± 0,25 % FS for med / high ranges
± 0,50 % FS for low range
- resolution: 1/4000 of full scale
• constant power mode:
- accuracy: ± 3 % FS for all ranges
- resolution: 0,25 % of full scale
• digital front panel display
• expandable to second load in parallel
• digital Interface via IEEE-488
• manual or computer controlled operation
• convenient front panel connection (800 W load)
• current and voltage performance*:
800 W Current – up to 50 A at 0,1 V; up to 150 A at 0,4 V Voltage 0 to 50 V
2000 W Current – up to 150 A at 0,1 V; up to 500 A at 0,4 V Voltage 0 to 50 V
4000 W Current – up to 250 A at 0,1 V; up to 1000 A at 0,4 V Voltage 0 to 50 V
*Higher Voltage Options Available

 

“State of the Art” Humidification Control:

  • proprietary design
  • dual reservoir construction
  • complete saturation at 75 °C and 2 liters/min
  • no erratic flow or water slugs in gas supply to cel
  • front panel sight tubes indicate water level
  • contact thermostats provide high temperature automatic cutoff for safety (automatically reset)
  • controlled by PID temperature control algorithm (parameters set in PowerStation™ software)
  • easy refill of water reservoirs
  • all stainless steel construction

Integrated Software for Safety and Flexibilty – System Control Features:

  • integral to the PowerStation™
  • not based on general purpose lab test software
  • not adapted from battery test
  • not modified from a 3rd party product
  • safety designed in – for unattended operation
  • quick and easy test configuration
  • real-time graphic data output
  • user friendly graphic user interface
  • independent control of each mass flow controller
  • pressure switches sense gas supply pressure defines safe operation for reactant and purge gas supplies
  • pressure transducers sense back pressure – senses gas leak for safety shutdown
  • PID temperature control software provides precision temperature control of humidifiers and fuel cells
  • PS interface monitors cell voltage and reference cell voltage directly
  • PS interface monitors backpressure of anode and cathode
  • watchdog timers monitors computer activity

 

Gas Flow Control:

  • 50 psig operation
  • automatic water traps empty without losing pressure
  • manual backpressure regulators
  • NEMA rated solenoid valves
  • normally closed on reactant lines (for safety)
  • normally open on purge lines (for safety)
  • reactant lines separated by leak-free solenoid valves
  • strategically located check valves prevent back-flow of reactant gases
  • precision, all stainless steel mass flow controllers (same as those used in the semiconductor industry)
  • under programmed control of the PowerStation™
  • gas flow accuracy +/- 1 % of full scale
  • gas flow precision +/- 0,2 % of full scale
  • gas flow resolution 0,1 % of full scale
  • seamless stainless steel tubing throughout

 

 Dual Range 1 Dual Range 2
Temperature Control Schematic:
(Temperature control is not an explicit function of the PS-DR™. It is a function of the PowerStation™ System Controller, the optional GTL™ gas transfer lines)

 

System Control Features:

  • pressure switches sense gas supply pressure – defines safe operation for reactant and purge gas supplies
  • pressure transducers sense back pressure – senses gas leak for safety shutdown
  • reactant solenoid valves are individually activated for flexible use
  • safe shutdown under several user selectable criterion
  • safe shutdown from power loss or computer crash

Dual Range Image 4

 

Dual Range Image 5

 

Specification:

Pressure: max. operating pressure 50 psig (approx. 4,5 bar)
MFCs:
full scale ranges available: 10 to 20000 sccm
control range: 2 % to 100 % of full scale
accuracy: +/- 1 % of full scale
repeatability: +/- 0,2 % of full scale
resolution: 0,1 % of full scale
wetted materials: 316L SS, Viton™, Nickel
Physical Characteristics:
17 1/2″ x 12 1/4″ x 18 1/2″;
44 x 31 x 47 cm (W x H x D)
110 lbs.; 50 kg
Gas Connections:
1/4″ Swagelok™ tubing connectors
front panel
output reactant gases to fuel cell (4)
reactant return gases from fuel cell (2)
ports for refill of humidifier bottles (2)
rear panel
input reactant gases (4)
input purge gas (1)
output venting of reactant gases (2)
output product water to drain (2)
Electronic Load:
power: 800 W (also available 2000 W or 4000 W)
selectable voltage: 0 – 10, 0 – 20 and 0 – 50 V
selectable current: 0 – 2, 0 – 20 and 0 -150 A
constant current and voltage mode:
- accuracy: ± 0,25 % FS for med / high ranges
± 0,50 % FS for low range
- resolution: 1/4000 of full scale
constant power mode:
- accuracy: ± 3 % FS for all ranges
- resolution: 0,25 % of full scale
Electrical Requirements: all power and control connections provided by PowerStation™Control Unit