BAKER HUGHES - Drilling Fluids Reference Manual

Water Based Drilling Fluids
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.
6. 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 290A
1. Connect electrode to meter.
2. Press (power) key to turn on meter.
3. Press the (mode) key until the CONC mode indicator is displayed.
4. Place the fluoride selective electrode into the 10 standard.
5. Press (2nd cal). CALIBRATE and the time and date of the last calibration will be
displayed. After a few seconds P1 will be displayed indicating the meter is ready
for the first standard.
6. When the reading is stable use the scroll keys to enter the value of the standard.
To enter a value, press the ∧ or ∨ key. The value will flash. Press the key again
and the decimal point will. flash. Position the decimal then press (yes). {Standard
value is 10} Continue for each digit on the display. There are 4 1/2 digits plus a
polarity sign and decimal point. The display will freeze for three seconds then P2
will be displayed in the lower field.
7. Rinse electrode and place into second standard. When the reading is stable enter
the value of the second standard {100} using the ∧ or ∨ and (yes) keys. The
reading will freeze for three seconds then P3 will be displayed.
8. Press (measure). The electrode slope will be displayed for a few seconds then the
meter will advance to MEASURE mode.
9. Rinse electrode and place into sample. Wait for a stable reading, then record
fluoride concentration directly from the main meter display. Record MAX-PLEX
concentration from the FLOURIDE ELECTRODE CORRELATION
CHART.
Sample Preparation for Analysis
1. Place 30 ml of 0.010 M (100 Standard) into a plastic graduated cylinder.
2. Transfer the 30 ml of solution to a plastic beaker.
Reference Manual
Baker Hughes Drilling Fluids
3-102 Revised 2006