Model 21 Adjustable Ratio pneumatic relay has a signal chamber lever arm, whereby the ratio of output pressure to signal pressure is infinitely adjustable. The adjustment range permits signal amplification of 1:30 or signal reduction of 30:1 by rotation of the ratio adjustment knob which moves the fulcrum.
| Rotork plc | |
|---|---|
| Product Category | Protective Relays and Monitoring Relays |
| Product Name | Relays, M21 |
