Series 661 Amplifying Relays are fixed-gain force-balance instruments, which incorporate bias adjustment that amplify pneumatic instrument signals.
| Siemens Process Instrumentation | |
|---|---|
| Product Category | Pneumatic Relays and Volume Boosters |
| Product Number | Model 661 |
| Product Name | Amplifying Relays with Bias |
| Type | Electric / Pneumatic Relay |
