Calibration Procedure for Pressure Transmitters

DCR No.: 03040

Effective: 8-4-03

Revision No.: 0

Supersedes: 8-4-03

Revision Date: 8-4-03

Page No.: 1 of 4

1

Purpose

1.1 The purpose is to provide guidelines for field calibration on chart recorder after its installation.

2

Scope

2.1 This procedure shall cover all chart recorders that will be commissioned by Therma’s Calibration Department.

3

Reference

3.1 Manufacturer’s Instruction Manual for Chart Recorder.

4

Responsibility

4.1 Field calibration technician shall coordinate with user to avoid disruption of plant facilities or operations before performing calibration.

4.2 Field calibration technician shall perform calibration as per the following procedures.

5

Tools and Test Standards

5.1 Resistance Decade Box: Model RTD 100; 10-1111 ohms range; ±0.01% accuracy setting

5.2 Thermocouple Calibrator: Transcat 5102 RTC; ±1% accuracy

5.3 Current/Voltage Calibrator: Unomat/Druck UPS-II; ±1% accuracy

5.4 Small hand tools

5.5 Temperature unit conversion table

6

Procedures

6.1 Gather all necessary tools and test standards. The test standards include resistance decade box, thermocouple calibrator and current/voltage calibrator. Make sure that the test standards have been calibrated and within the calibration period.

6.2 Before performing calibration, perform the following maintenance for the chart recorder.

6.2.1 Inspect the chart recorder for any physical defects.

6.2.2 If dust has been accumulated on the external surface, clean the surface with clean cloth.

6.2.3 Check all electrical connections for tightness.

6.2.4 Replace back up batteries (if one is installed).

6.3 Remove sensor wires from the input terminals and connect to the test standards.

6.4 Apply 0 to 100% of range values to the chart recorder and correct span on both pen arm and digital indicator (if present).

6.5 Apply 10%, 50% and 90% of range values to the chart recorder. Record the three point values in “As Found Data” section on form FN 6.018.1 (Calibration Sheet for Relative Humidity & Temperature Chart Recorder).

6.6 Perform Calibration Adjustment

6.6.1 Simulate 0 to 100% of input signals to the chart recorder. Correct zero and span for both pen arm and digital indicator (if present).

6.6.2 Apply 10%, 50% and 90% of range values to the chart recorder. Record the three point values in “As Found Data” section on form FN 6.018.1 (Calibration Sheet for Relative Humidity & Temperature Chart Recorder).

6.7 Place Therma’s calibration sticker on the chart recorder upon completion of calibration.

6.8 If the transmitter did not meet the calibration tolerances and adjustments, contact the customer.

6.9 The field calibration technician shall fill in the calibration data including test standard data on form FN 6.018.1 (Calibration Sheet for Relative Humidity & Temperature Chart Recorder) before submitting to project manager.

7

Review and Approval

7.1 The field calibration technician shall submit the form FN 6.018.1 (Calibration Sheet for Relative Humidity & Temperature Chart Recorder) to the project manager.

Document Approval

Field Calibration

Date

Quality Assurance Manager

8/4/03

Date