RL 243 MP Multi-Purpose Relay
Technical Instructions
Document Number 155-042P25
September 10, 2018
Siemens Industry, Inc.
Page 7
Signal Inverting Relay
Input signal will pass directly to relay output until maximum output pressure is reached
(1/2 of spring setting). A further rise in input pressure will reduce output by an equal
amount (Figure 9).
Figure 9. Signal Inverting Relay.
Characterized Min.
Pressure Relay
Initial input from controller will increase relay output above minimum at a 2/1 ratio until
relay output is twice the minimum value. A further increase in input pressure will increase
the output an equal amount (1/1 ratio) (Figure 10).
Figure 10. Characterized Min. Pressure Relay.
