Metex P/R60C-8 Differential pH/ORP Sensors - Manual (Page 8)

P/R60 & P/R65 Page 8
3.8 Insertion mounting Series 4 Differential Probes
3.8.1 Apply pipe sealant to the electrode end of the probe and screw it into the any
standard 1-1/2” Male NPT.
3.9 Hot/Wet tap insertion mounting Series 7 Differential Probes
Refer to Dwg# N106-79
3.9.1 a) A ball valve assembly, P60-HTC, is available from AquaMetrix which includes
the assembly and a safety shroud.
b) Mount the ball valve assembly in a desirable location. The assembly comes
with a field selectable, 1-1/4 NPTF or socket adaptor. Make sure valve is in the
close position before mounting.
c) Remove the union body by turning the union nut counter clockwise. Take the
compression fitting apart as shown on the drawing. Insert the back end of the
series 7 probe through the union body until safety notch on the probe aligns
with the safety stop on the union body.
d) Place the union body, with the probe attached, back into the ball vale assembly
and tighten union nut. Open ball valve & slide the probe into the process.
e) Put the compression fitting components on the probe in the order shown in the
drawing and tighten the nut by hand as much as possible, then turn 1/2 turn
with a wrench to keep probe in place.
f) Insert protective shroud as shown.
4.0 SERVICE AND MAINTENANCE
4.1 Probe Cleaning
4.4.1 a) The probe should be kept reasonably clean to avoid measurement errors.
Frequency of cleaning can only be determined by experience. To clean
proceed as follows:
b) Rinse with clean warm water.
c) Soak the end of the probe in warm water and dish detergent for 3 or 4 minutes.
d) Brush the end of the probe, particularly the three electrodes with a soft bristle
brush such as a tooth brush. Take care not to scratch the glass electrode.
e) If the probe is still not clean, it may have to be cleaned with acid. CAUTION:
Do not acid clean probes used in processes containing cyanide solutions.
Some experimentation may be required to determine the most suitable acid for
your process. Use the most dilute acid which is effective. Normally 10 parts of
water to one part muriatic acid is sufficient. Do not use hydrofluoric acid.
f) Soak the probe for not more than 5 minutes in the chosen acid; then rinse
thoroughly with clean warm water and soak in water for 3-5 minutes.
g) Calibrate the system in accordance with the instrument instruction manual.