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Siemens
Energy & Automation
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
Model Series
Material and Function
A – Brass, Amplifying
R – Brass, Reducing
Input-to-Output Ratio
2 -
1:2, Model 66BA2
2:1, Model 66BR2
3 -
1:3, Model 66BA3
3:1, Model 66BR3
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)
INSTALLATION AND SERVICE INSTRUCTION
66
BA
2
4 -
1:4, Model 66BA4
4:1, Model 66BR4
6 -
1:6, Model 66BA6
6:1, Model 66BR6
SD66
Rev 11
January 2006
Supersedes Rev 10
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Summary of Contents for Siemens 66 Series
- Page 1 Siemens INSTALLATION AND SERVICE INSTRUCTION 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.
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Page 2: Installation
SD66 INSTALLATION Shipping and Storage If the relay is to be stocked, stored, or shipped to another location prior to piping, make sure that the factory installed plastic plugs are in the ports to prevent entry of moisture, dirt, or other contaminants. Mounting Mount the relay in any position, in a reasonably vibration-free location. -
Page 3: Principle Of Operation
SD66 CAUTION Synthetic compressor lubricants in the air stream at the instrument may cause it to fail. The requirements for a quality instrument air supply can be found in the Instrument Society of America's "Quality Standard for Instrument Air" (ISA-S7.3). Basically, this standard calls for the following: Particle Size —... -
Page 4: Maintenance
SD66 MAINTENANCE Most problems associated with pneumatic instruments can be prevented by providing clean, dry, oil-free instrument air (see Instrument Air Requirements). If these requirements are met, routine maintenance should not be necessary. Cleaning of the plunger and the supply and exhaust ports may be required, on an occasional basis, as outlined in the Cleaning section. - Page 5 SD66 Calibration The only calibration adjustment for the relay is the adjustable exhaust seat which sets the output span. This adjustment must be made if the relay has been disassembled for parts replacement, ratio change, etc. Equipment Required: • Regulator and test gauge for setting supply air •...
- Page 6 • A copy of the product Service Instruction, User’s Manual or other technical literature should be at hand. The Siemens public Internet site (see the table) has current revisions of technical literature, in Portable Document Format, for downloading. Downloaded from StockCheck.com...
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Page 7: Warranty
+1 215 646 7400 extension 3187 For contact information outside of the U.S.A., visit the Siemens public Internet site (see the above table for the URL), locate “Customer Support Process Instrumentation,” and click on the Contact Tech Support link to access the Global Support link. -
Page 8: Parts List
Siemens Energy & Automation, Inc. assumes no liability for errors or omissions in this document or for the application and use of information in this document.