Operation
Mini-Convectron Module Instruction Manual - 275513 39
3.3 Setpoint Relays
The module includes one single-pole, double throw (SPDT) relay or two such 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.
When the module is shipped from the factory, relays are set to activate below 0.0 Torr. The relays
will not operate until they have been adjusted for the application.
Adjustment causes setpoint relays to activate with decreasing pressure and deactivate at a higher
pressure than the activation pressure, as illustrated in Figure 3-12.
Figure 3-12 Setpoint Relay Behavior
Deactivate
Activate
Deactivated
Activated
Relay
Hysteresis:
• 2% of reading for module without display
• 10% of reading + 1 significant digit for
module with optional display
Time
Vacuum chamber pressure
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