Probe with Stainless Steel Housing for Online pH Monitoring

pH Dipping Probe DP-HP5

The pH dipping probe DP-HP5 consists of a polymer optical fiber where one end is coated with a pH sensitive foil. It is covered with a high grade steel tube to protect the fiber and the sensor material. The steel tube has an outer diameter of 4 mm and a length of 10 cm. Other lengths are available on request. Due to its slender shape the probe can be used for profiling applications in coarse sediments. As this probe is based on a polymer optical fiber it is compatible with temperatures up to + 50 °C.

  • Pressure resistant (max. 5 bar)
  • No reference electrode necessary
  • No electrolyte solution to replenish
  • Easy exchange of pre-calibrated sensor membranes
  • Easy and effective one-point calibration or highly precise multi-point calibration supported by the software
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*provided pH dipping probes are used without further handling in physiological solutions
*equilibrated dipping probe kept in well stirred solution at + 37 °C

Measurement range5.5 - 8.5 pH
Resolutionat pH = 7: ± 0.01 pH
Accuracyat pH = 7: ± 0.05 pH
Driftat pH = 7: < 0.005 pH per day (sampling interval of 1 min.)
Measurement temperature rangefrom + 5 to + 50 °C
Response time (t90)**< 120 sec.
CompatibilityAqueous solutions, ethanol (max. 10 % v/v), methanol (max. 10 % v/v), pH 2 - 10
Cross-sensitivityReduced to ionic strength (salinity); a high concentration of small fluorescent molecules in the visible range can interfere
CalibrationpH dipping probes are pre-calibrated; re-calibration is possible
Storage stability18 months provided the sensor is stored in the dark

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