Siemens Industry 66BA2

The Model 66 Amplifying and Reducing Relays are used 10 increase or decrease con1rol-eircuil pressure signals.

Its input pressure, acting upon the effective area of the top diaphragm, produces a force that is balanced by the force produced by the output pressure applied over the effective area of the lower diaphragm. Any imbalance in these opposing forces will operate the plunger, increasing or deceasing air supply to the output chamber. (The amplifying or reducing ratio is fixed by the ratio of input-to-output diaphragm areas.)

An increase in input opens the pilot valve to admit supply air directly to the output. A decrease in input opens the exhaust port to exhaust air from the output.

Product Highlights

• Pneumatic signal conditioning provides control circuit design flexibility
• Powder coating provides improved corrosion resistance
• Supply Pressure
  • Normal: 20 psig (140 kPa)
  • Maximum· 80 psig (550 kPa)
  • Minimum: 1 psi (7 kPa) above maximum required output
• Range Limits
  • 80 psig max. for input or output - whichever limits
• Overrange Limits
  • 100 psig (690 kPa) at any connection
• Maximum Output Pressure: Within 0.1 psi (0.7 kPa) of supply
• Minimum Output Pressure: Less than 0.4 psig (3 kPa) with zero output
• Ratio Accuracy: Within 1% of nomal ratio
• Flow Capacity: 2.2 sctm minimum