Model: M21
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.
| Ambient Temperature (°C) | -40 to 93.3 |
| Maximum Supply Pressure (psig) | 250 |
| Ratio Range | 30:1 to 1:30 |