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Reference Electrodes
& Accessories
Copper Sulfate / Silver Chloride / Antimony
by MCM - MC Miller Co.
- Low cost
- Easy to use
- Reliable
- Rugged
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- Replaceable CPT porous plug
- Lexan tube with window
- Extra heavy top cap
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The MCM Line of
Reference Electrodes
All copper sulfate electrodes are shipped dry but include a charge of high-purity
copper sulfate crystals. A protective cap for the CPT porous plug is also supplied.
Special lengths of RE-5, RE-5C and RE-7 are available on special order. Use and
Maintenance Instructions are furnished with each electrode.
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Model
RE-5, Cat. No. 15108 Standard Model. Flat CPT Porous Plug, for general
use in soil and (with Submersible Adapter) for use in water. Approximate overall Size: 1-3/8" dia. x 6" long. Dry weight: 4 oz. |
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Model
RE-5C, Cat. No. 15210 Similar to Model RE-5 except supplied with a
cone-shaped CPT porous plug. For use in soft soils. Provides lower contact resistance.
When pushed into soft soils, the shape of the plug helps the electrode to "stand
up." Approximate overall size: 1-3/8" dia. X 6 3/4" long. Dry weight: 5 oz. |
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Model
RE-5/U, Cat. No. 15109 For use on underside of bridge decks, parking
garages, etc. in upside-down position. |
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Model
RE-7, Cat. No. 15301 Long, slim model with beveled CPT porous plug. For
general purpose use in soil or in a 1" diameter augered hole in pavement. Approx.
overall Size: 1" dia. x 8-1/2" long. Dry weight: 5 oz. |
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Model
RE-3A, Cat. No. 14909 Large diameter (3") flat CPT porous plug
provides greater contact area. Flat plug provides lower contact resistance than rounded or
serrated plug when placed in direct contact with flat surfaces. Especially useful on
pavements, dry sand, frozen soil, etc. Stands by itself. Approximate overall size: 3"
dia. x 5" long. Dry weight: 16 oz. |
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Model
PH-50, Cat. No. 14700 Antimony Reference Electrode
Used in conjunction with a Copper / Copper Sulfate reference electrode and voltmeter to
measure the pH of soil. The tube assembly of the electrode is etched with the conversion
table of millivolts to pH. Approximate overall size: 7/8" dia. x 8" long. |
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Model
RE-7AG, Cat. No. 13175 Silver/Silver Chloride Reference
Electrode Kit: Land/Sea
Used on land with Lexan tube, CPT ceramic plug and KCl filling solution. Used in sea water
with perforated Lexan tube, brass submersible weights (any number of weights can be
attached together, two included in kit) and standard 8' submersible adapter (available in
additional lengths). |


Accessories &
Parts for MCM Reference Electrodes
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Extension, Cat. No. 16203
Intermediate electrode extension, 30" long. One or more can be used with MCM Model
I.A. and LC series meters, or between the electrode and the standard electrode extension,
so that the electrode can be easily placed at the desired location inside manholes, water
tanks, etc. Will fit through a 1" diameter augered hole.
Extension, Cat. No. 16101
Intermediate electrode extension, 30" long, with side terminal connection that
allows use of the electrode without bending over or stooping. Extensions are also
available in 15" lengths by special order.

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Submersible
Adapters Converts any MCM Electrode for use underwater. Includes your
choice of lead length (8', 25', 50', 100', 150' or 200') with 27-C Copper Test Clip
attached. Water tight connection. |
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Copper
Sulfate, Cat. Nos. 16906 & 17003 Finely divided high-purity
crystals. Available in 3/4 lb(Cat. No. 16906) and 21/2 lb (Cat. No. 17003) containers.
Under normal conditions, a 3/4 lb container will be sufficient to maintain one electrode
for a year. |
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Anti-freeze
Solution, Cat. Nos. 17105 & 17207 For use with any MCM's Electrode.
Permits potential measurements with temperature as low as -10oF (-23oC) without danger of
cracking electrode tube. Available in 8 fl. oz. (Cat. No. 17105) and 32 fl. oz. (Cat. No.
17207) containers. Can be used year round. |
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Spare
Plug Assemblies Replacement or spare plug assemblies are available for
all electrodes and are supplied with an "O" ring gasket and a protective cap.
Note that the RE-5 and RE-5C plugs are interchangeable. |


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Model RE-375
Copper Sulfate Electrode

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Advantages
Potential measurements through small holes.
Probe into bore holes or paving inserts.
Packaged with distilled water or antifreeze.
Precision-machined for reliable, leak-proof seals.
Non-leak tubular carrying case.
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Model EXT-375
Extendible Electrode

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Advantages
Threaded connections will not pull apart.
Sections internally wired for continuity.
High purity copper
sulfate electrode.
Circumferential and longitudinal wound fiberglass for
exceptional strength.
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General
Copper-Sulfate Reference
Electrodes & Accessories
(often Referred to as "Half Cells")
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The
M.C. Miller Co. "RE-" series of electrodes provides three areas of improvement
over other electrodes formerly available. These are: a Lexan Tube, a CPT ceramic plug, and
a strong top cap with a 1/4" high-purity copper rod with 1/4 x 20 external thread and
brass knurled nut. The CPT ceramic plugs offer numerous advantages:
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- The porosity of the CPT ceramic plug is uniform and controlled. All ceramic plugs are
alike.
- The CPT ceramic plug is fast wetting, and the electrode can be used within minutes after
filling. (It often takes many hours to wet up a wood plug).
- The CPT ceramic plug is pre-treated to provide lower electrical resistance which remains
low as long as the plug is moist with saturated copper-sulfate solution.
- A CPT ceramic plug can become thoroughly dried out, and it will re-wet in a few minutes
with the same low resistance. It is not necessary to keep the electrode in a position
where the solution will be in contact with the plug.
- Tests indicate that it is not necessary to keep the CPT plug covered to prevent drying
when not in use. It is, however, desirable to do so, and a protective cap is provided for
this purpose.
- The CPT ceramic plug is housed in a high-density polyethylene fitting, which helps
protect it against chipping or breaking in the event it is accidentally dropped.
The brilliant orange color of the Lexan tube was selected to provide an electrode which
can be readily seen in grass, and to help locate it when it is placed remote or when it
breaks loose from the "pull-in" lead. Some of its other advantages are:
- The Lexan tube used in the Model RE-5, RE-5C and RE-7 electrodes is extruded in two
colors, orange and clear. The orange is opaque and provides a sun shield to eliminate the
small potentials which sometimes occur with full transparent tubes. A clear transparent
section extending the length of the electrode provides a window for visual inspection to
observe the condition and level of the copper-sulfate solution. We believe this window is
essential to maintain the electrode in good condition. Lexan is also used in the body of
the Model RE-3A Electrode, but the color is painted on the inside rather than extruded. An
inspection window is provided.
- The Lexan tube is highly resistant to damage. It can be misused, pushed into soft
ground, dropped, and carried in a tool kit without breaking.
The top caps of the Model RE-5, RE-5C and RE-7 are heavy and strong. They are machined
out of high-density polyethylene rod, and are extra thick where the copper rod is threaded
through. A neoprene gasket provides a liquid and air tight seal. The top cap of the Model
RE-3A is molded Cycolac, as is the plug receptacle.

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