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
- Calibration Certificate Number
- Procedure number
- Pressure gauge details
- Reference instrument details
- Pressure switch location, ID details,
- Accuracy
- Calibration date & Recommended due date
- Error, FS Error and Ex. Uncertainty
- Calibration engineer name & signature
- Approving authority name & signature
- Stamp of certification
ALSO READ: SOP for Temperature & Moisture Control Test
Tags
Engineering