SE558 pH Sensor

The SE558 is a low-maintenance digital pH sensor engineered for media of very low conductivity, such as ultrapure water, boiler feed water and condensate. Memosens technology delivers galvanically isolated, contact-free signal transfer, protecting measurements from humidity and enabling lab precalibration plus integrated sensor diagnostics. Three ceramic junctions and a KCl reservoir with gel electrolyte ensure stable, flow-independent reference potential, while the built-in NTC temperature detector supports automatic temperature compensation. Approved for use in hazardous areas, it suits demanding water and analytical chemistry applications.

Specifications

Measurement Parameter:

pH

Connector:

Memosens

Measuring Range:

0 … 14 pH

Explosion protection:

Yes

Length:

120 mm

Process Connection:

PG 13.5

Temperature Detector:

NTC 30 kΩ

Junction:

Ceramic (3×)

Reference System:

Ag/AgCl/Cl gel with KCI storage rings

Relative process pressure:

–1 … 3 bar (-14.5 … 43.5 psi)

Wetted materials:

Body → Glass Junction → 3× ceramic Sensor tip → Alpha glass

Process Temperature:

–5 … 100 °C (23 … 212 °F)