GF Signet 276 Differential Series Operating Instructions Manual

Signet 275X Series Wet-Tap DryLoc
Signet 276X Series Diff erential DryLoc
Signet 277X Series Threaded DryLoc
*3-XXXX.090*
3-2764.090 Rev 9 11/18
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pH and ORP Electrodes
®
pH and ORP Electrodes
®
pH and ORP Electrodes
®
Description
The Signet General Purpose 275X Wet-Tap and High Performance 276X and 277X series
of pH and ORP electrodes are designed to minimize maintenance time and maximize
performance longevity and value. All three family of pH and ORP electrodes are memory
chip enabled to store Manufacturing, Calibration and Operational Data. For more fl exibility
and unique features, pair any pH or ORP electrode with a 2751 Smart Sensor Electronics
and the 9900 Transmitter, 9950 Dual Channel Transmitter or the 0486
Profi bus Concentrator.
The 275X Wet-Tap electrodes are all-purpose sensors ideal for applications where the probe
can be removed for cleaning and maintenance without the system shutdown. They feature a
unique foul-proof DryLoc ® connector with gold-plated contacts, designed specifi cally for use
with the Signet 2751 Smart Sensor Electronics, and 2760 Preamplifi er. These dependable
and highly responsive electrodes feature a large reference chamber and intelligent
positioning of internal elements that combine to extend the service life. The electrodes
are off ered with a bulb sensing element that can be used for general purpose applications
where a fast response is required even at low temperatures. The choice of a Pt1000 or
3 KΩ temperature sensor allows compatibility into all Signet pH/ORP instruments. The 3719
Wet-Tap assembly allows installation and removal of electrode even under process pressure
without the need for process shutdown.
The Signet 276X Series Diff erential pH and ORP electrodes feature a Ryton
PTFE reference junction to resist fouling, clogging and chemical attack under harsh
chemical applications. The Diff erential electrodes use a 3-electrode technique, measuring
the pH and reference electrodes against a ground electrode for a more stable output signal.
The solution ground eliminates noisy measurements by draining electrical current away from
the reference electrode. The reference electrode is housed in a glass half-cell embedded
in the reference chamber to protect it from poisioning or contamination. The electrolyte
chamber is refi llable and the salt bridge is fi eld replaceable.
The Signet 277X Series pH and ORP electrodes are highly responsive electrodes featuring
a PTFE double reference junction, potassium nitrate, KNO
various poisoning ions such as copper (Cu
reference chamber. The two chambers combine to extend the service-life of the electrode.
Both the 276X Series and the 277X Series feature a unique foul-proof DryLoc
with gold-plated contacts designed specifi cally for use with the Signet 2751 Smart Sensor
Electronics and 2760 Preamplifi er. They are available with either fl at or bulb style sensing
elements. The bulb versions can be used for general-purpose applications. The fl at versions
allow sediment and particles to sweep past the measurement surface, minimizing risks of
abrasion, breakage and coating. All versions can be installed at any angle. The temperature
device in the pH electrodes is positioned at the tip of the measurement surface, resulting in
a temperature response of less than 1 minute. Temperature devices available include 3 KΩ,
or Pt1000 RTD.

Operating Instructions

in the front chamber (to block
3,
), lead (Pb ), mercury (Hg
2+ 2+
English
body and
®
)) and a large
2+
connector
®