The Walchem WPH600 controller is now obsolete and is replaced by the Intuition-6 series of controllers. The new series is enhanced, but has similar specs. For reference, here are the specifications of the old model:
Series: WPH600
Relays/Wiring: 100-240 VAC, Hardwired or Prewired, with Different Combinations of Relays Available
Input Cards: 2 Slots Available for Various Sensor Input Cards
Analog Outputs: Optional Dual Isolated Analog (4-20 mA) Output Card
Ethernet: Optional Ethernet or Ethernet with Modbus & BACnet
Sensors: Optional Single or Dual, Low Pressure or High Pressure Manifolds (sensors sold separately)