Calibration of Pressure Switch

The objective of this method statement is to provide general guidelines for calibrating Pressure gauge at customer’s premises.

PROJECT NAME : __________

Location : __________

Scope

Scope of this method statement covers the following topics.

Reference Procedure

Phoenix Calibration Technical Manual- PCW-P02:2021.

Master Equipment

Pressure Indicator, Pressure Pump, Manifold, Cylinder, Ultrasonic Thickness Gauge.

Preparation prior to Calibration

Reach the calibration location accompanied by the site engineer or In-charge.
Check the environment suitability to execute the calibration process.
Get the pressure switch location details from site engineer / In-charge.
Make sure the pressure switch inlet pressure control has been closed and switch is depressurized. If not inform the site engineer / in-charge.

Calibration

Carefully remove the pressure switch from it’s location.
Check the pressure switch physical condition and make sure it is free from defects.
Clean the pressure switch by using appropriate mean.
Note the switch details like range, make, model, serial no., location, ID No., etc. on the relevant worksheet.
Prepare the pressure gauge calibrator.
Connect the switch to be calibrated to the pressure calibrator.
Check the set pressure value and apply the pressure to the switch.
Check the open / close status of pressure switch, when the applied pressure reaches the set pressure.
Note down the pressure value and the switch status .
Complete the calibration worksheet and paste the calibration identification sticker on the appropriate part of the pressure switch.
Fix the pressure switch on its location with accompanied by the site engineer / In-charge.

Acceptance Criteria

For pressure switch with class 1 accuracy, 1%FS
For pressure switch with class 1.5 accuracy, 1.5%FS
For pressure switch with no class specified, accuracy will be obtained from the user / customer.

Calibration Certificate Information

United State Pharmacopeia 2024 (USP 47 - NF 42)