Martel Electronics MasterCAL - Manual (Page 89)

Calibrator
Calibrating a Process Instrument
79
Calibrating a Limit Switch
The procedure to calibrate a limit switch also uses
the As Found and As Left calibration templates.
Select either the
1 Pt. Switch or 2 Pt. Switch
procedure in a menu after you press the As Found
softkey. Figure 24 defines the terminology used in
calibrating limit switches.
The template to set up the limit switch procedure lets
you select the following parameters:
•
Switch sense (normally open or closed).
•
For each setpoint:
•
Setpoint value.
•
Setpoint tolerance.
•
High limit or low limit.
•
Minimum deadband.
•
Maximum deadband.
Switch A
Open
Switch B
Setpoint
Reset
Switch A
Setpoint
Switch B
Open
Switch B
Closed
Switch A
Closed
Process
Variable
Switch A: Low Limit Switch B: High Limit
Deadband
Deadband
Reset
gj24f.eps
Figure 24. Limit Switch Terminology