Differential pH or ORP Probes

PHETX-600 Series

PLACE ORDER

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

Industrial pH Instrumentation and Electrodes - View related products

Description

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

Place Order(Specify Model Number)

Part Number/ Desc.

Qty

Description

PHETX-600

Consult Sales

Availability:

1 1/2 NPT differential pH electrode with 4 to 20 mA outout

ORETX-600

Consult Sales

Availability:

1 1/2 NPT differential ORP electrode with 4 to 20 mA outout

PHETX-610

Consult Sales

Availability:

Compression fitting pH electrode with 4 to 20 mA output for 7/8 to 5" variable insertion

ORETX-610

Consult Sales

Availability:

Compression fitting ORP electrode with 4 to 20 mA output for 7/8 to 5" variable insertion

PHETX-620

Consult Sales

Availability:

Hot tap pH electrode with 4 to 20 mA output for 7/8 to 5" variable insertion

ORETX-620

Consult Sales

Availability:

Hot tap ORP electrode with 4 to 20 mA output for 7/8 to 5" variable insertion

Accessories

PHE-600-SB

£165.06

Availability: 6 weeks

Replacement salt bridge kit for 600 Series

PHE-612-SB

£165.06

Availability: 2 weeks

Replacement salt bridge kit for 610 Series

PHE-600-EP

£165.06

Availability: 6 weeks

Electrode protector for 600 Series

PHE-610-EP

Consult Sales

Availability:

Electrode protector for 610 Series

PHE-620-BVA

Consult Sales

Availability:

PVC hot tap ball valve assembly for 620 Series

PHA-10

£13.58

Availability: In Stock

pH 10 buffer solution 500 ml (1 pt)

PHA-10-GAL

£33.92

Availability: In Stock

pH 10 buffer solution 4L (1 gal)

PHA-4

£13.58

Availability: 2 weeks

pH 4 buffer solution 500 ml (1 pt)

PHA-4-GAL

£33.92

Availability: In Stock

pH 4 buffer solution 4L (1 gal)

PHA-7

£13.58

Availability: In Stock

pH 7 buffer solution 500 ml (1 pt)

PHA-7-GAL

£33.92

Availability: In Stock

pH 7 buffer solution 4L (1 gal)

PHA-DI

£16.06

Availability: 2 weeks

De-ionized water 500 ml (1 pt)

PHA-DI-GAL

£40.13

Availability: 2 weeks

De-ionized water 4L (1 gal)

PHAB-DI

£36.42

Availability: 4 weeks

20 single use foil packets of de-ionized water

PHAB-PH

£36.42

Availability: 2 weeks

5 each single use foil packets of pH-4, pH-7, pH-10, and de-ionized water

† All amounts shown in EUR, GBP, or USD
Note: Comes complete with electrode, salt bridge and operator’s manual.