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page 6 OMEGA PHE/ORE Series pH/ORP Electrode Instructions
Technical Features
a) Male BNC connector
b) Keyed for a simple sure fit
c) Viton® O-rings
d) Silicone-bushing seal
e) Double junction
f) Ag/AgCl reference element
g) Platinum sensing surface (ORP) or flat pH glass
h) Porous UHMW polyethylene reference junction
a
b
c
d
e
f
g
o
l
k
j
i
h
n
m
c
6. Replacement parts and accessories
Mfr. Part No. Description
PHE-3271 Flat pH Electrode
PHE-3271-HF Flat pH Electrode, HF Resistsant
ORE-2715 Flat ORP Electrode
PHE-2716 Bulb pH Electrode
PHE-2716-DI Bulb pH Electrode, DI Resistant
ORE-2717 Bulb ORP Electrode
PH-270-PA Preamplifier,
3
/4 in. NPT
P31515-0V200 PVDF Pipe Adapter
FPP-1220-0021 O-ring, FPM (standard)
FPP-1224-0021 O-ring, EPR
FPP-1228-0021 O-ring, Kalrez
i) 3K Balco thermistor
j) Solidified acrylamide reference
electrolyte
k) Ag/AgCl measuring element
l) Large reference volume
m) Epoxy seal
n) Shielding
o) 10KΩ I.D. resistor for ORP sensor
CAUTION!
Apply O-ring lubricant to sensor O-rings prior to assembly.
Unlubricated O-rings may score the sealing surface in the 2720.
WARNING!
Wear appropriate eye, face, hand, body, and respiratory protection when using chemicals or solvents.
5.2 Cleaning
Cleaning techniques vary depending on the type of coating present on the glass electrode surface or reference junction.
• Soft coatings can be removed by vigorous stirring, or with directed spray of an applicable detergent or solvent onto the glass
electrode surface. Chlorine bleach or mild detergent may be used to remove soft coatings. Always rinse electrode tip in clean water
after cleaning.
• Hard coatings can be chemically removed. Use the least harsh chemical which will remove the contaminant within two (2) minutes
without attacking the materials of construction. e.g. calcium carbonate may be removed with a 5% HCL (muriatic acid) solution.
• Oily or organic coatings can be removed with detergents or an appropriate solvent that does not attack the materials of
construction e.g. isopropyl alcohol may be used but acetone must be avoided to prevent damage to the CPVC sensor body.
• ORP electrode surface (platinum rod) can be gently sanded with 600 grit wet and dry silicone or carbide sandpaper, jewelers rouge,
crocus cloth, or very fine steel wool.