Omega Products ORETX-600 User Manual

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Differential pH or Orp Probes With 4 to 20 mA Outputs

PHETX-600/

ORETX-600 Series

PHETX-600

⁄

NPT differential

pH electrode.

PHETX-620, hot tap

pH electrode with

PHE-620-BVA, PVC

hot tap ball valve.

All models shown

smaller than actual size.

PHETX-610 compression fitting pH electrode.

U Integral 2-Wire 4 to 20 mA Transmitter U Accurate Differential Measurement U Eliminates Ground Loop Interference U Built-In Pre-Amp Supports Up to 914 m (3000')

Sensor-to-Analyzer Distance

U 4.6 m (15') Standard Cable Length U Automatic Temperature Compensation on pH Versions

Applications

U Process Control, Industrial and Municipal Water Treatment U Industrial and Municipal Waste Treatment,

and Neutralization

U Fume Scrubbers, Plating, and Circuit Board Manufacturing U Food and Beverage U Chemical Processing U Pulp and Paper U Mining and Power Generation U Pharmaceuticals

OMEGA 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

pH and ORP differential probes stay in service and

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: 1 body style (‑600), “easy‑in, easy‑out” variable insertion depth version with 1 version (‑620).

⁄

NPT compression fitting (‑610), or the hot tap

⁄

NPT threaded

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Specifications

4.6 m (15') Cable

PHETX/ORETX-600

4.6 m (15') Cable

180

(7.10)

228

(9)

394

(15.5)

(1.14)

¾ NPT

Compression

Fitting

25 (1)

1½ NPT

37 (1.44)

61 (2.4) Sensor

removal

clearance

for front

thread mount

Min 22 (7/8) Max 127 (5)

PHETX/ORETX-610

PHETX/ORETX-620

394

(15.5)

(1.14)

25 (1)

PHETX/ORETX-620

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

Dimensions: mm (inch)

4.6 m (15') Cable

1½ NPT

180

(7.10)

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 (149ºF) 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: 5 conductor plus shield, 4.6 m (15') long

1½ NPT

61 (2.4) Sensor

removal

clearance

for front

thread mount

PHETX/ORETX-600

37 (1.44)

To Order Visit omega.com/phetx-600 for Pricing and Details

Model No. Description

PHETX-600 1¹⁄₂ NPT differential pH electrode with 4 to 20 mA outout ORETX-600 1¹⁄₂ NPT differential ORP electrode with 4 to 20 mA outout PHETX-610 Compression fitting pH electrode with 4 to 20 mA output for ⁷⁄₈ to 5" variable insertion ORETX-610 Compression fitting ORP electrode with 4 to 20 mA output for ⁷⁄₈ to 5" variable insertion PHETX-620 Hot tap pH electrode with 4 to 20 mA output for ⁷⁄₈ to 5" variable insertion ORETX-620 Hot tap ORP electrode with 4 to 20 mA output for ⁷⁄₈ to 5" variable insertion

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

Accessories Model No. Description

PHE-600-SB Replacement salt bridge kit with PVDF outer junction (3 pack) for PHETX/ORETX‑600 series PHE-612-SB Replacement salt bridge kit with PVDF outer junction (3 pack) for PHETX/ORETX‑610/620 series PHE-600-EP Electrode protector for PHETX/ORETX‑600 PHE-610-EP Electrode protector for PHETX/ORETX‑610/620 PHE-620-BVA PVC hot tap ball valve assembly for PHETX/ORETX‑620 PHA-4 4.00 pH buffer solution 500 mL (1 pint) bottle PHA-7 7.00 pH buffer solution 500 mL (1 pint) bottle PHA-10 10.00 pH buffer solution 500 mL (1 pint) bottle

Ordering Examples: PHETX-600, 1 PHETX-620, hot-tap differential pH electrode with 4 to 20 mA output, and PHE-620-BVA, PVC hot tap ball valve assembly.

NPT diffiential pH electrode with 4 to 20 mA output, PHA-4, pH 4 buffer, and PHA-7, pH 7 buffer.

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