661系列带偏压放大继电器,Siemens 661继电器
661系列带偏压放大继电器,Siemens 661继电器简单介绍
Fixed-gain force and bias adjustment mechani***s amplify pneumatic instrument signals to provide control circuit design flexibility
661系列带偏压放大继电器Amplifying Relays with Bias Siemens 661继电器的详细介绍
Features & Benefits
Fixed-gain force and bias adjustment mechani***s 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
(c***tant) 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
