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Integral 2-Wire 4 to 20 mA Transmitter
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Accurate Differential Measurement
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Eliminates Ground Loop Interference
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Built-In Pre-Amp Supports Up to 914 m (3000') Sensor-to-Analyzer Distance
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4.6 m (15') Standard Cable Length
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Automatic Temperature Compensation on pH Versions
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View related products - Industrial pH Instrumentation and Electrodes
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OMEGA™ pH and ORP differential probes stay in service and
provide accurate measurements under conditions that often render
conventional pH probes inoperable. These probes, come with an
integral encapsulated 4 to 20 mA 2-wire transmitter to feed directly
to a PLC or a DCS.
The PHETX-600 and ORETX-600 probes employ a differential
measurement technique. Unlike conventional combination probes,
the differential probe has two high impedance measurement
circuits containing a common metallic return electrode. One circuit
includes the process measurement electrode which generates a
potential E1 proportional to the process pH. The second circuit
includes an internal measurement electrode immersed in a stable
buffer solution which generates a standard reference potential, E2.
Both circuit share a common potential E3 developed at the return
electrode. The two circuits are fed into amplifiers which provide an
output representing the differential between them: (E1 - E 3)–
(E2 - E3). The common potential E3 is cancelled out electronically,
greatly reducing inaccuracies caused by ground loops which may
exist between process and instrument grounds. Ground loop
current will flow through the low impedance path of the return
electrode, affecting the potential E3, but not the
differential measurement.
The differential probe maintains its accuracy and stability in
aggressive process applications long after a combination-style
probes performance begins to deteriorate. Maintenance costs are
reduced and the life of the probe is increased. The internal
reference electrode is electrically connected to the process
solution by means of a field-replaceable double junction salt bridge
which greatly reduces the possibility of contamination of the buffer
solution in the reference circuit. Although seldom required, the
reference solution may be easily replaced by removing the
screw-out salt bridge. A salt bridge and buffers are available for
this purpose.
Another advantage of the PHETX/ ORETX-600 series are the
semi-flush face which is easily cleaned and avoids solution
materials gathering on protrusions found in other probes. The
domed glass electrode, the protective metal electrode and the
temperature sensor protrude only about 1⁄8" while the salt bridge is
flush. A flat-face version of the pH probe is also available.
The PHETX/ORETX-600 series is available in: 1½ NPT threaded
body style (-600), “easy-in, easy-out” variable insertion depth
version with 1¼ NPT compression fitting (-610), or the hot tap
version (-620).
SPECIFICATIONS
Measuring Range:
pH: 0 to 14 pH (consult factory for applications below 2 or above 12)
ORP: -500 to 500 mV or 0 mV to 1000 mV, field selectable
Flow Rate: 10 ft/sec max (3 meters/sec) flow should be as low as possible in low conductivity water and in solutions with high suspended solids
Wetted Materials: CPVC, kynar, glass, titanium palladium alloy and EPDM (platinum for ORP probe); opt FKM and ceramic
Transmission Distance: Dependant upon transmission distance and supply voltage 1
Sensitivity:
pH: 0.001 pH
ORP: 0.1 mV
Stability
pH: 0.03 pH per day, non-cumulative
ORP: 2 mV per day, non-cumulative
Temperature Compensation (Automatic): -5 to 95°C (23 to 203°F)
Pressure Limit: 100 psig at 65°C (149°F) max
Temperature Limits (CPVC): -5 to 95°C (23 to 203°F) the temperature limit of probes in flow through applications is limited by pressure and by the pipe fitting material.
Probe Cable: 4.6 m (15') long
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† All dollar amounts on this site are shown in US currency.
Note: Comes complete with electrode, salt bridge and operator’s manual.
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