Model 69

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.
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