How to check Level Switch and Limit Switch

How to check Level Switch and Limit Switch

How to check Level Switch

  • Float or displacer type level switches shall be calibrated in calibration room or site using clean water as the test medium.
  • Displacement type switches shall be tested in position using water as a test medium. Particular attention shall be paid where the specific gravity of the process medium is different to that of water.
  • A transparent PVC tube with a scale shall be connected to the bottom of the chamber for level gauge use. Water shall be poured in the chamber for the calibration.
  • Set the switch to the required value and with a continuity tester, each set of contacts shall be checked for make/break contacts as required.
  • The high alarm switch values shall be taken at the contact break point when the input value is rising.
  • The low alarm switch values shall be taken at the contact break point when the input value is falling.
  • The alarm and differential gap between alarm and reset shall be noted and recorded on approved calibration form.
  • After testing, all ports and entries shall be sealed to prevent ingress of dirt and moisture.
  • After the test has been completed, the instrument shall be identified with a color code sticker.

how to check level switch

How to check limit switch

  • The function of limit switches shall be checked.
  • Where possible, the function shall be checked manipulating the switch input. The result shall be witnessed and the operation to be recorded.
  • Triloop/SPA HART position feedback for anti-surge control valve shall be checked.
  • After the test has been completed, the instrumentation shall be identified with color code sticker.
  • Results shall be filed and recorded on applicable forms as per approved.

Read also : Linearity Check and Calibration Of Vibration Probe (Axial and Radial) & Proximitor

DISPLACER TYPE LEVEL TRANSMITTER CALIBRATION INSTRUMENTATION

Calibration of Differential Pressure Indicator

 

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