Temphion Reference Electrode; General Precautions - Seametrics TempHion Instructions Manual

GENERAL INFORMATION
TempHion™ Reference Electrode
TempHion's patented reference electrode is the key to
TempHion's superior downhole/high pressure performance.
TempHion uses a long capillary pathway, initially filled
with reference electrode filling solution, to separate the
reference electrode chamber from the solution being
analyzed. In addition, TempHion's reference electrode is
filled without any air (which is compressible). With this
construction, the principle mechanism that will eventually
allow test solution to enter the reference chamber and
contaminate the reference electrode filling solution is
diffusion – an exceedingly slow mechanism. Further, while
the capillary pathway is narrow by garden hose standards,
its open cross-section is huge compared to the microscopic
openings in a conventional porous ceramic fluid/fluid
junction. It is therefore much less susceptible to fouling.
TempHion's proven stability under actual field conditions is
measured in weeks or months, rather than hours or days!
The figure below illustrates the construction of the

TempHion reference electrode.

capillary pathway between the reference and test solutions
is established using a modified screw thread. This means
that the capillary can be easily opened up for cleaning,
refilling, or other maintenance.
Reference
Electrode
Assembly
Reference Electrode Assembly: The modified thread provides
a continuous liquid path between the solution in which the
instrument is immersed and the reference element.
TempHions with standard pH elements, ISE elements,
and ORP elements come with the TempHion Reference
Electrode, as described above.
Seametrics • 253.872.0284
Please note that the
Liquid Junction Port
Outer Reference
Housing
Capillary Flow path
(Modified Thread)
Reference Electrode
Filling Solution
Reservoir
Reference Element

General Precautions

The rest of this manual includes step-by-step instructions
for setting up the TempHion calibrating it, and using it in
the field. When reading and following the instructions in
these sections, keep these very important considerations
in mind:
• Do not handle the surfaces of the sensing
electrodes. Oils from fingers can "blind" the
reactive surface. Rough handling can scratch the
reactive surface.
• Use calibration standards that are accurately
prepared. Discard standards after use. Do not
return the used standards to the bottles of "fresh"
solution.
• When TempHion's reference electrode contains
filling solution, the O-ring at the top of the
reference assembly must be in the upper position.
(See further details under Installation later in this
manual.)
• For any step-change in temperature (e.g., where
calibration standards are at a different temperature
than water to be tested) allow the instrument to
come to complete thermal equilibrium before
making measurements. Up to 30 minutes may be
required.
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TEMPHION INSTRUCTIONS
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