Calibration Procedure for Tempaerature Transmitters

1

Purpose

1.1 The purpose is to provide guidelines for field calibration on instruments after their installation.

2

Scope

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

3

Reference

3.1 Manufacturer’s manual for the specific instrument.

4

Responsibility

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

5

Procedures

5.1 Gather all necessary fittings and test equipment needed for specific transmitter. Make sure that the test equipment has been calibrated and within the calibration period.

5.2 Obtain manufacturer manual for any additional setup information.

5.3 Place element in a temperature standard.

5.4 Set the temperature standard to the required test points.

5.5 Connect a milliamp meter to the output of the transmitter and record readings on a temperature transmitter calibration sheet, FN 6.016.

5.5.1 Set the temperature source to the low point of the transmitter range.

5.5.2 Allow readings to stabilize and adjust the zero potentiometer until the appropriate reading is achieved on the current meter.

5.5.3 Set the temperature source to the high point of the transmitter range.

5.5.4 Allow readings to stabilize and adjust the Span potentiometer until the appropriate reading is achieved on the current meter.

5.5.5 Set the temperature source to mid point of the transmitter range.

5.5.6 Allow readings to stabilize and adjust the Span potentiometer until the appropriate reading is achieved on the current meter.

5.5.7 Repeat the calibration adjustments as described in Steps 5.5.1 to 5.5.6 until readings are at appropriate levels.

5.5.8 Record all data on the temperature transmitter calibration sheet, FN 6.016.1.

5.6 Place Therma’s calibration sticker on the transmitter upon completion of calibration.

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

6

Review and Approval

6.1 The field calibration technician shall submit the temperature transmitter calibration sheet, FN 6.016.1 to project manager.

Document Approval

Robert McCann
Field Calibration
7-14-03
Quality Assurance Manager
7-21-03