INSTALLATION AND SERVICE INSTRUCTION
Siemens
Energy & Automation
SD66
Rev 11
January 2006
Supersedes Rev 10
Model Series 66 Amplifying and Reducing Relays
INTRODUCTION
The Model Series 66 Amplifying and Reducing Relays are used in control circuit to amplify and reduce pneumatic
signals. The output of a relay is proportional to its input by the fixed gain factor of that relay model.
This instruction has six major sections: Introduction, Installation, Principle of Operation, Maintenance, Warranty,
and Parts List.
Model Designation
66
BA
2
Model Series
Material and Function
A – Brass, Amplifying
R – Brass, Reducing
Input-to-Output Ratio
2 -
1:2, Model 66BA2
2:1, Model 66BR2
4 -
1:4, Model 66BA4
4:1, Model 66BR4
3 -
1:3, Model 66BA3
3:1, Model 66BR3
6 -
1:6, Model 66BA6
6:1, Model 66BR6
Specifications
Supply Pressure
Normal..................................... 20
psig
Minimum................................. 1
psig
above maximum required output
Maximum ................................ 80
psig
Normal Operating Range....................... 3 to 15 psig
Operating Range Limits
Amplifying Relay .................... Not to exceed 80 psig output
Reducing Relay ....................... Not to exceed 80 psig input
Overrange Limits................................... 100 psig to any connection
Ambient Temperature Limits ................ -40° to +180°F (-40° to +82°C)
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