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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
Description
Description
trodeks® pH and ORP differential probes stay in service andprovide accurate measurements under conditions that often renderconventional pH probes inoperable. These probes, come with anintegral encapsulated 4 to 20 mA 2-wire transmitter to feed directlyto a PLC or a DCS.
The PHETX-600 and ORETX-600 probes employ a differentialmeasurement technique. Unlike conventional combination probes,the differential probe has two high impedance measurementcircuits containing a common metallic return electrode. One circuitincludes the process measurement electrode which generates apotential E1 proportional to the process pH. The second circuitincludes an internal measurement electrode immersed in a stablebuffer solution which generates a standard reference potential, E2.Both circuit share a common potential E3 developed at the returnelectrode. The two circuits are fed into amplifiers which provide anoutput 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 mayexist between process and instrument grounds. Ground loopcurrent will flow through the low impedance path of the returnelectrode, affecting the potential E3, but not thedifferential measurement.
The differential probe maintains its accuracy and stability inaggressive process applications long after a combination-styleprobes performance begins to deteriorate. Maintenance costs arereduced and the life of the probe is increased. The internalreference electrode is electrically connected to the processsolution by means of a field-replaceable double junction salt bridgewhich greatly reduces the possibility of contamination of the buffersolution in the reference circuit. Although seldom required, thereference solution may be easily replaced by removing thescrew-out salt bridge. A salt bridge and buffers are available forthis purpose.
Another advantage of the PHETX/ ORETX-600 series are thesemi-flush face which is easily cleaned and avoids solutionmaterials gathering on protrusions found in other probes. Thedomed glass electrode, the protective metal electrode and thetemperature sensor protrude only about 1⁄8" while the salt bridge isflush. A flat-face version of the pH probe is also available.The PHETX/ORETX-600 series is available in: 1½ NPT threadedbody style (-600), “easy-in, easy-out” variable insertion depthversion with 1¼ NPT compression fitting (-610), or the hot tapversion (-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 Anemometer | Automation | Accelerometers | Calibrator | Cartridge Heaters | Chart Recorders | Cryogenics | Custom Pressure Transducers | Data Loggers | Data Acquisition | Dial Thermometers | Fiber Optics | Fiber Optic Temperature Measurement | Flexible Heaters | Flow Meters | Glass Bulb Thermometers | Grippers | Heaters | Humidity Measurement | Integrated Circuit Sensors | Immersion Heaters | Infrared Thermometers | Level Measurement | Load Cells | M12 Temperature Connectors | Magnetic Flow Meter | Panel Meter | PID Controllers | pH meter | Pressure Gauges | Pressure Transducers | Pressure Transmitters | Rotameters | RTD | Remote Process Monitoring | Sanitary Sensors | Signal Conditioners | Stepper Motors | Strain Gages | Strip Heaters | Temperature Controllers | Temperature Labels | Temperature Measurement | Temperature Sensor Manufacturing | Temperature Sensors | Temperature Transmitters | Thermal Imagers | Thermistors | Thermocouple | Thermocouple Wire | Thermowell | Ultrasonic Flow Meters | Vortex Flow Meter | Wireless Sensors
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