Setpoint Relays; Analog Module; Analog Relay 1 Behavior; Hysteresis - HELIX GRANVILLE-PHILLIPS Convectron ATM Instruction Manual

Chapter 3
3.3

Setpoint relays

Table 3-6 Setpoint relay activation direction, range, and hysteresis
Relay Assignment
Setpoint 1 Vacuum chamber pressure
Setpoint 2 Differential pressure
Figure 3-7 Setpoint relay 1 behavior
26
The module includes two single-pole, double throw (SPDT) relays. Each
relay has a programmable setpoint. The setpoint is a voltage level that
corresponds to a specified pressure at which the relay activates and
deactivates. See Table 3-6.
In default mode, relay 1 activates with decreasing vacuum chamber
pressure and deactivates at a higher pressure than the activation pressure,
as illustrated in Figure 3-7.
In default mode, relay 2 activates with increasing differential pressure and
deactivates at a lower pressure than the activation pressure, as illustrated in
Figure 3-8 on page 27. Use internal jumpers to reconfigure relay 2
activation direction. See page 33.
Activation direction
Decreasing pressure
Increasing pressure
Deactivate
Activate
Activated
Deactivated
Range
1.0 x 10
–750 to +125 Torr
Time
Relay activated
®
Convectron ATM Vacuum Gauge Module Instruction Manual

Hysteresis

–4 2
to 9.99 x 10 Torr 30 mV
8 Torr
30mV
hysteresis