MKS Baratron 631D, Инструкция по эксплуатации, Страница: 53 / 64

Chapter Five: Optional Solid-State Relay System
45
IF Initial Pressure < Trip Point Value
TRIP POINT
HYSTERESIS
TRIP POINT
VALUE
0.030 Volts
LED ON
Relay Turned ON
LED OFF
Relay Turned OFF
IF Initial Pressure > Trip Point Value
Final Pressure
Figure 9: LED and Relay State When Trip Point Direction Set Above Trip Point Value
If the preset direction for Trip Point B is “below”; the trip point is turned ON as the pressure falls
below the specified trip point level. The trip point is not turned OFF until the pressure rises
above the value defined by the hysteresis, as shown in Figure 10. Figure 10 also depicts the relay
being turned ON when the initial pressure condition applied to the unit is below the trip point
value.
IF Initial Pressure > Trip Point Value
TRIP POINT
HYSTERESIS
TRIP POINT
VALUE
0.030 Volts
LED ON
Relay turned ON
LED OFF
Relay turned OFF
IF Initial Pressure < Trip Point Value
Final Pressure
Figure 10: LED and Relay State When Trip Point Direction Set Below Trip Point Value
Note that regardless of trip point direction the time response of the 631D transducer will have a
minor affect of the time between (1) a change in the pressure condition necessary to cause a
change in the relay state and (2) the relay actually changing state. The time response is specified
in Appendix A: Product Specifications, page 49.