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Model 3200HP pHaser™ High Purity Water pH Sensor
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- pHaser™ LASER DRILLED CAPILLARY junction ensures constant reference electrolyte flow for unsurpassed performance (patent pending)
- ACCURATE AND STABLE Measurement of pH in Boiler Water, Boiler Feedwater and Steam Condensate
- REFILLABLE FLOWING REFERENCE and Replaceable Open-Capillary Junction for Years of Dependable Service
- QUICK AND EASY Calibration and Maintenance
- ELECTRONIC SHIELDING of Glass Electrode Improves Immunity to EMI
- RUGGED Combination Electrode with VP Connector
- INTEGRAL SOLUTION GROUND for Measurement Stability and Complete Diagnostic Functionality
- EXPOSED STAINLESS STEEL Thermowell for Rapid Temperature Response
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FEATURES AND APPLICATIONS
The Rosemount Analytical Model 3200HP pH sensor is designed for the accurate measurement of pH in low
conductivity, high purity (HP) water. Boilers, both industrial and in power plants, provide several points
where low conductivity pH measurements are necessary. The key to an accurate measurement is a stable reference
electrode that produces the same potential over many months of service whether in calibrating solutions or
high purity water.
The 3200HP sensor is a panel mounted system consisting of an electrolyte reservoir, a flow cell, a combination
pH, reference, temperature sensor with integral solution ground and a calibration cup holder. The flowing
reference electrode uses a laser drilled capillary for the liquid junction, the pHaser™ reference junction.
The pHaser™ reference electrode is unaffected by the conductivity changes that occur when the sensor is moved
between calibration buffers and low conductivity water; it continues to produce the same potential. The laser
drilled capillary design is immune to drift caused by the long term plugging common to all ceramic reference
junctions. A 100 ohm platinum RTD is housed in a 316 SS solution ground near the pH glass electrode assuring
fast and accurate temperature compensation. These features combined with the rapid response and stability of
the AccuGlass™ pH electrode provide an unsurpassed level of performance in high purity water.
OPERATION
Calibrations are easily accomplished by loosening the sensor union nut and moving the 3200HP from the flow
cell to the supplied buffer cup, complete the calibration and return the sensor to the flow cell.
As in many pH applications, in high purity water the reference electrode wears out long before the glass electrode
fails. The reference electrode of the 3200HP is rebuildable. The pHaser™ liquid junction is easily replaced and the
electrolyte reservoir is refillable. The reservoir typically provides greater than 2 months trouble free service
between refills.
| SENSOR SPECIFICATIONS |
| Accuracy | ±0.05 pH |
| Noise | < 0.02 pH |
| Drift | < 0.05 pH per week |
| Conductivity Range | > 0.4 µS/cm |
| Sample Flow Rate | 1 - 3 gph (60 to 180 ml/min) |
| Wetted Materials | CPVC, Silicone, polycarbonate/polyester, glass, stainless steel, PVDF, Viton1 |
| Sample Temperature | 0°C to 70°C (32°F to 160°F) |
| Sample Pressure | 5 to 10 psig – drain to atmosphere |
| Process Connections | 1/4" FPT |
| Reference Electrode | Flowing, open capillary |
| Weight/Shipping Weight | 5.4 lb / 7.6 lb (2.5 kg / 3.5 kg) |
pHaser™ is a trademark of Rosemount Analytical
AccuGlass™ is a trademark of Rosemount Analytical
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