MESA LABORATORIES, INC. DataTrace Division
Standard
Operating
Procedure
Release Date: August 27, 2010
Page: 30 of 32
Revision B
7. Retrieve the target Tracer from the reference environment after the required minimum
stabilization time. Prepare to read the Tracer.
8. Return to the UTILITIES Tab of the DataTrace Control Panel. Place the Tracer in the PC
Interface and press Read Tracer. The calibration program will determine that the Tracer
is in the midst of performing a humidity calibration.
9. When the Tracer is read following the calibration procedure listed above (steps #1 thru
#5), answer the questions and fill in the blanks as described in the instructions displayed.
10. On the first screen, select the parameter to calibrate and whether a Single Point or a Two
Point calibration is needed.
11. Select the Tracer Reading (what the Tracer is actually reading) from those indicated in
the drop down box on the left side of the screen. Select the humidity value that is closest
to the time that the Reference Value was determined.
12. On the next box, enter a reference value (what the Tracer should be reading), then enter
a reference name and/or description. Enter a description in the text box on the left side of
the screen. This data is used to document the calibration and will be stored in the
Calibration History log.
13. Items #10, #11, and #12 are repeated for the second point if a Two Point Calibration was
selected.
14. On the next screen, a summary of the one or two points is displayed showing for each
point the original and corrected values. This information will be placed into the Calibration
History report.
15. On the final screen of the calibration, enter any comments in the space provided. Enter
the Operator’s Name for documentation purposes. Also, to print a Report of Calibration,
enable that option at this time.
This completes the Two Point humidity calibration process. Press Finish. A Calibration Complete!
screen will appear, press OK.
REPLACEMENT AND CALIBRATION OF A NEW HUMIDITY SENSOR:
This section provides instructions for the physical replacement of the humidity sensor in a
Humidity Tracer. Following the sensor replacement, the sensor may need to be calibrated.
Calibration instructions are also included in this section.
DO NOT ALLOW THE HUMIDITY SENSOR TO BE CONTAMINATED BY DIRT, DUST,
FINGER OILS, SALTS, OR LIQUIDS AS IT COULD DAMAGE THE SENSOR AND/OR IT’S
CALIBRATION.
WE RECOMMEND THAT POWDER-FREE, LATEX SURGICAL GLOVES ARE WORN AFTER
THE SENSOR COVER IS REMOVED TO AVOID SENSOR CONTAMINATION.
The FRB Humidity sensors are shipped with a cover to protect the sensor from
mechanical shocks and contamination. Do not remove the cover until instructed to do so.
The MPIII sensors do not need a protective cover.