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简单介绍：
Fixed-gain force and bias adjustment mechanisms amplify pneumatic instrument signals to provide control circuit design flexibility
详情介绍：
Features & Benefits
Fixed-gain force and bias adjustment mechanisms amplify pneumatic instrument signals to provide control circuit design flexibility
Description
Series 661 Amplifying Relays are fixed-gain force-balance instruments, which incorporate bias adjustment that amplify pneumatic instrument signals. For example, a 3-15 psi signal can be amplified to operate a 3-27 psi control valve.
The input pressure signal, acting upon the effective area of the upper diaphragm, produces a force opposed by the
force produced by the output pressure applied over the effective area of the lower diaphragm and by a manually-set
(constant) spring force. Any inbalance in the opposing forces will operate the pilot valve to throttle supply air to change the output until rebalance is achieved.
Plus or minus biasing of the input signal is accomplished by changing the setting of the upper biasing spring, which alters the net spring force on the diaphragm assembly.、
Specifications
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
Minimum Output Pressure：Less than 0.1 psi (0.7 kPa)
Ratio Accuracy：Within 1% of normal ratio
Linearity：±1% of output span
Reproducibility：Within 0.1% of output span
Response Level：0.2" H2O (5 mm H2O)
Bias Range：Direct Acting: +30 psi to -15 psi (210 to -100 kPa)
Flow Capacity：2.2 scfm minimum (62.3 SDM3/M)
Air Consumption：0.15 scfm maximum (4.25 SDM3/M)
Ambient Teperature Limits：-40 to 180° F (-40 to 82° C)
Materials of Construction：Brass, aluminum, stainless steel, and Neoprene
Fixed-gain force and bias adjustment mechanisms amplify pneumatic instrument signals to provide control circuit design flexibility
Description
Series 661 Amplifying Relays are fixed-gain force-balance instruments, which incorporate bias adjustment that amplify pneumatic instrument signals. For example, a 3-15 psi signal can be amplified to operate a 3-27 psi control valve.
The input pressure signal, acting upon the effective area of the upper diaphragm, produces a force opposed by the
force produced by the output pressure applied over the effective area of the lower diaphragm and by a manually-set
(constant) spring force. Any inbalance in the opposing forces will operate the pilot valve to throttle supply air to change the output until rebalance is achieved.
Plus or minus biasing of the input signal is accomplished by changing the setting of the upper biasing spring, which alters the net spring force on the diaphragm assembly.、
Specifications
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
Minimum Output Pressure：Less than 0.1 psi (0.7 kPa)
Ratio Accuracy：Within 1% of normal ratio
Linearity：±1% of output span
Reproducibility：Within 0.1% of output span
Response Level：0.2" H2O (5 mm H2O)
Bias Range：Direct Acting: +30 psi to -15 psi (210 to -100 kPa)
Flow Capacity：2.2 scfm minimum (62.3 SDM3/M)
Air Consumption：0.15 scfm maximum (4.25 SDM3/M)
Ambient Teperature Limits：-40 to 180° F (-40 to 82° C)
Materials of Construction：Brass, aluminum, stainless steel, and Neoprene
