BAKER HUGHES - Drilling Fluids Reference Manual

Baker Hughes Drilling Fluids
6. Pour the 30 ml of 0.010 M Potassium Fluoride solution into a plastic beaker.
7. Deliver by pipette or 10cc plastic syringe 3 ml of the Acetic Acid/Potassium Acetate
Buffer into the plastic beaker of 0.010 M Potassium Fluoride.
8. Swirl the beaker contents to ensure proper mixing. Allow the solution to set for five
minutes.
Instrument Calibration, Measuring, and Electrode Care:
Electrode Preparation
The electrode is shipped without filling solution in the reference chamber. To fill from the flipspout
bottle:
1. Lift the spout to a vertical position.
2. Insert the spout into the filling hole in the outer sleeve and add a small amount of filling
solution to the chamber. Tip the electrode to moisten the O-ring at the top and return
electrode to a vertical position.
3. Holding the electrode by the barrel with one hand, use the thumb to push down on the
electrode cap, allowing a few drops of filling solution to drain to wet the inner cone.
4. Release sleeve. If sleeve does not return to its original position immediately, check to see
if the O-ring is moist enough and repeat steps 2-4 until the sleeve has returned to original
position. Add filling solution up to the filling hole.
5. The probe is now ready for use
Add filling solution each day before using electrode. The filling solution level should be at least
one inch above the level of sample in the beaker to ensure a proper flow rate. If the filling
solution is less than one inch above the sample solution level, electrode potentials may be erratic.
Calibration Procedure for Orion Model 720A
1. Fasten the electrode into the appropriate jack on the meter.
2. Turn the instrument on and wait approximately one minute.
3. Press [1ST] and then press [MODE]. Continue to press [MODE] until the LCD reads
“CON” (concentration).
4. Press [1ST], then press [CALIBRATE]. The instrument will display time, date, year, and
when last calibrated. The instrument will then display the number of calibrators be used.
5. Place probe in the 0.0010 (10) standard solution.
6. Enter the # of calibrators to be used, in this case 2 , then press [YES]. The instrument will
start to measure the concentration. A minute will elapse and the instrument will display
“ENTER CONCENTRATION”. Enter (10) and press [YES].
7. Remove probe from the 0.0010 standard solution. Rinse the probe with distilled water and
blot with a paper towel. DO NOT WIPE PROBE!
8. Place probe in the 0.010 (100) standard. After 1 minute, the instrument will display
“ENTER CONCENTRATION”. Enter (100) and press [YES].
9. The instrument will start to show several displays. Monitor the mv reading. It should
be within the range of 55-60. (If the mv reading falls outside this range, the electrode
should be replaced.)
Baker Hughes Drilling Fluids
Reference Manual
Revised 2006 3-91