Calibration Trigger Types

Most systems are set up with multiple calibrations that act differently depending on their specific uses. Calibrations can be triggered in one of six ways depending on the instrument or frequency of calibration run time.

Below is a list and explanation for each of the calibration trigger types:

A – Automatic Cal

  • This calibration is initiated by the data controller’s internal clock and is repeated on a preset interval. An A-type calibration cannot be configured without a starting time and an interval (repeat) time.
  • A-type calibrations allow the data controller to output any configured physical or digital output line during the phases of the calibration, which allows the controller to close and open solenoid valves for set periods of time during each phase.

E – Externally Initiated Cal

  • An externally initiated calibration is initiated in the data controller by an input expression.
  • E-type cals allow for more versatility in logic programming, as they can be triggered by anything that closes an input. This includes a physical input wired into the back of the logger, an event program that closes a pseudo output/input at a specific time every day, a console that closes a pseudo input based upon a configured button, any many more.
  • As with the A-type calibration, an E-type calibration allows the controller to close and open solenoids based upon its own programming.

I –Instrument Controlled Cal

  • An instrument controlled calibration is initiated and controlled by external equipment, and cannot be started or stopped manually.
  • Unlike an E or A-type calibration, each phase of an I-type calibration is controlled by an input expression. So long as the external instrument is closing the inputs that correspond with a phase of the calibration, the calibration will remain running in that phase.

U –User Initiated Cal

  • This calibration is similar to an E or A-type calibration, except that there is no trigger expression. A U-type calibration can only be triggered manually from the logger or from StackVision. Most often a U-type calibration is configured for a Linearity or CGA.
  • Once manually triggered, the calibration will control calibration phase times and output expressions based upon how it is configured.

L –User Initiated w/ Confirming Digital Inputs

  • The L-type calibration is similar to the U-type calibration in that it can be only triggered manually, however each phase must have a Confirming Input Expression configured. Each phase of the calibration must have the configured input expression be true for the calibration to move onto the next phase. If the input expression is not closed before the end of the phase, the calibration will be aborted.

M –Interactive (Menu) Cal

  • In this kind of calibration, the user controls calibration data acquisition via a menu interface. While each phase of the calibration is configured to close a specific output expression, the phase length and phase data time (period of time used for the calibration evaluation) are controlled by the user in a menu driven interface on the logger.

For more information about how calibrations are configured in your system, contact the ESC Support team.
 512-250-7901  •  support@envirosys.com


If you would like help configuring calibrations in your system, contact the ESC Sales team.
512-250-7902  •  sales@envirosys.com

 

Clint Anderson, Lead Project Engineer I, ESC    Published: 6/6/2017 12:30:01 PM

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