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7ML19981CM01.1
MERCAP – INSTRUCTION MANUAL
Page 7
Electrodes and Process Connections
This section of the manual is designed to assist in the determination of the best possible
probe configuration for your application. Therefore, we discuss the electrodes and process
connections before the instrumentation and the operation procedures. When configuring the
unit to your application, use the sample configurations below as your criteria.
Mercap electrodes come in a variety of formats to provide the necessary characteristics for
correct mounting, chemical compatibility, temperature and pressure requirements, and
dielectric constant. Most applications use the simple threaded connection, which is directly
mounted in the tank with the mating threaded nipple, or with a flange adapter that includes a
threaded hole.
For applications requiring higher temperature and pressure, or greater integrity, welded and
solid machined flange versions are available with single or double cone seals, and/or a
second seal on the flange plate to avoid any metallic wetted parts.
Handling of Electrodes
WARNING
: Do not scratch or gouge the PFA electrode insulation since this could
reduce the integrity of the insulation and the useful life of the electrode.
WARNING
: Be careful with an enamel insulated electrode. Normally an enamel lining
is protected by a stilling well, which is part of the design.
WARNING
: Do not damage the insulation jacket on the electrode during shipping,
packing, and installation. Most electrodes use PFA insulation, a very dense and reliable
type of Teflon
that prevents leakage and corrosion of the metal electrode and acts as
an insulator when conductive materials are being measured. Any damage to the
electrode can prevent proper performance.
WARNING (ATEX 100):
Precautions
MUST
be taken to avoid ignition due to
hazardous electrostatic charges when an isolated probe is used in a potentially
explosive atmosphere caused by gas, vapor, or a non-conductive liquid, requiring
apparatus group IIC equipment. Or when the probe is used in a potentially explosive
atmosphere caused by dust.
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