Relays Series 69 Reversing Relays Introduction Features & Benefits Signal reversing accommodates quick conversion of direct acting valve positioners to reverse action Powder coating provides improved corrosion resistance Description The Series 69 Reversing Relays deliver an output that decreases in proportion to an increase in input pressure. They are primarily used in valve operation. The input pressure acts between upper and lower diaphragms. The resultant force, which is a function of the difference in effective diaphragm areas, is exerted in a direction opposing the force of the spring. With zero input pressure, the Model 69-1 Reversing Relay maintains a set output with the output pressure rebalancing the springloading force. With a decreasing input signal, the pilot valve will open to increase output. With an increasing input signal, the pilot valve will close to reduce output. At any time, the spring loading force may be adjusted to change the outputpressure level. An increase in the input pressure opposes the spring-loading force and decreases the output pressure in a ratio of 1:1. With the Model 69-3 Relay, the lower diaphragm area is smaller. Therefore, a 1 psi increase in input pressure produces a 3 psi decrease in output pressure. Specifications 7 Dead Spot Nominal Input/Output Ratio Maximum: Model 69-11: 1:1 Model 69-31: 1:3 Flow Capacity Overrange Limit (Input) 14 scfm (1.4 dm3/m)2 200 psi (14 bar) Ambient Temperature Limits Overrange Limit (Output) -40 to 180°F (-40 to 82°C) 0.5 psi (4 kPa) output 0-100 psi (0-7 bar) output 200 psi (14 bar) Maximum Operating Pressure 100 psi (7 bar) Minimum Supply Pressure 5 psi (0.4 bar) above maximum output Zero Adjustment 0-100 psi (0-7 bar) output 1) Deviation from the nominal 1:1 or 1:3 ratio may be as much as 6%. These relays are, therefore, not normally used in measuring circuits. 2) 100 psi (7 bar) supply, 15 psi (1 bar) output. 3) For mounting dimensions, please contact the factory. 7.40