Differential pH or ORP Probes

PHETX-600 Series

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•	Integral 2-Wire 4 to 20 mA Transmitter
•	Accurate Differential Measurement
•	Eliminates Ground Loop Interference
•	Built-In Pre-Amp Supports Up to 914 m (3000') Sensor-to-Analyzer Distance
•	4.6 m (15') Standard Cable Length
•	Automatic Temperature Compensation on pH Versions
View related products - Industrial pH Instrumentation and Electrodes

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

Order on www.omegaengineering.cn and 5% will be discounted when you checkout.

To Order (Specify Model Number)
All list prices are pre-VAT rate not including tax and shipping

Part Number	Availability	Price(RMB)	Description	Qty.
PHETX-600		Consult sales	1 1/2 NPT differential pH electrode with 4 to 20 mA outout	qty.

ORETX-600		Consult sales	1 1/2 NPT differential ORP electrode with 4 to 20 mA outout	qty.

PHETX-610		Consult sales	Compression fitting pH electrode with 4 to 20 mA output for 7/8 to 5" variable insertion	qty.

ORETX-610		Consult sales	Compression fitting ORP electrode with 4 to 20 mA output for 7/8 to 5" variable insertion	qty.

PHETX-620		Consult sales	Hot tap pH electrode with 4 to 20 mA output for 7/8 to 5" variable insertion	qty.

ORETX-620		Consult sales	Hot tap ORP electrode with 4 to 20 mA output for 7/8 to 5" variable insertion	qty.


Accessories

PHE-600-SB	6 Weeks	¥1,765.00	Replacement salt bridge kit for 600 Series	qty.

PHE-612-SB	2 Weeks	¥1,765.00	Replacement salt bridge kit for 610 Series	qty.

PHE-600-EP	6 Weeks	¥1,765.00	Electrode protector for 600 Series	qty.

PHE-610-EP		Consult sales	Electrode protector for 610 Series	qty.

PHE-620-BVA		Consult sales	PVC hot tap ball valve assembly for 620 Series	qty.

PHA-10	2 Weeks	¥154.00	pH 10 buffer solution 500 ml (1 pt)	qty.

PHA-10-GAL	2 Weeks	¥384.00	pH 10 buffer solution 4L (1 gal)	qty.

PHA-4	2 Weeks	¥146.00	pH 4 buffer solution 500 ml (1 pt)	qty.

PHA-4-GAL	2 Weeks	¥364.00	pH 4 buffer solution 4L (1 gal)	qty.

PHA-7	2 Weeks	¥146.00	pH 7 buffer solution 500 ml (1 pt)	qty.

PHA-7-GAL	2 Weeks	¥364.00	pH 7 buffer solution 4L (1 gal)	qty.

PHA-DI	2 Weeks	¥182.00	De-ionized water 500 ml (1 pt)	qty.

PHA-DI-GAL	3 Weeks	¥430.00	De-ionized water 4L (1 gal)	qty.

PHAB-DI	4 Weeks	¥390.00	20 single use foil packets of de-ionized water	qty.

PHAB-PH	2 Weeks	¥390.00	5 each single use foil packets of pH-4, pH-7, pH-10, and de-ionized water	qty.

† Price are shown in RMB.

Note: Comes complete with electrode, salt bridge and operator’s manual.

Keywords:Differential pH or ORP Probes

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Differential pH or ORP Probes