1. Stray DC voltages (1 to 5 volts) should not affect the accuracy of pH/ORP measurement.
2. The pH needs to be closely controlled for optimum production in a very energy intensive process.
3. The system should perform for long periods of time: 1) without recalibration; 2) despite precipitate buildup on the sensor; 3) without reference diluion effect.
4. The sensor must also perform under these adverse conditions:
. High temperatures (90 OC) that are variable
. High sodium (Na +) ion concentration (maintain linearity)
. Presence of corrosive chemicals (NaCI, NaCIO 3, NaOCI, CI 2, HCI)
The preceding considerations for pH/ORP measurement call for instruments based on BI's Differential Electrode Technique of measurement. The following features address the crucial needs for successful measurement.
pH/ORP Sensor : Differential Electrode Measurement Technique. Fast response. Bufered reference solution . Special glass for high alkaline pH . Excellent chemical resistance (LCP-encapsulated)
pH/GAP Transmitter : .Microprocessor-based . Buffer sensing calibration . Diagnostic error messages.
Typical BI pH and OAP systems consist of :
A. One pH sensor (Model
B. One ORP sensor (Model 3028P0C) One
ORP transmitter (Model 692R)
Field experience has shown that the Differential Technique is the method of choice in pH/ORP measurement. Conventional sensor measurements are erratic, even with a current interrupter.
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