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SERVICE INSTRUCTIONSDifferential pH ProbeType 18

3Figure 3Application range of the differential pH probe3 Technical DataMeasuring range pH 3 to pH 12Operating temperature 0 to 140°COperating pressure15 bar, no pressure compensationMeasuring chain zeropH 7 to pH 14 (product-dependent)Slope Min. 50 mV/pH at 25°CTemperature compensation with Pt 100 resistance thermometerThermal shock resistance max. 130°CTransmitter requirementsInputs2 symmetrical high-resistance inputs > 1 x 1012 ΩZero point selectable between pH 0 and pH 14Uis compensationbetween -500 and +500 V or for ISpH3Temperature compensation with Pt 100 resistance thermometerFigure 3 Dimension of type 18

7The information provided in this documentation corresponds to the state of the art at the time of printing. Itis published in good faith. However, we will accept no warranty claims based on the information providedin this documentation. We reserve the right to include improvements, amendments and new findings in thisdocumentation without prior notice. The actual design of products may deviate from the information containedin the catalog if technical alterations and product improvements so require. The proposal made byPfaudler for a concrete application will be binding in such cases.The present documentation is made available free of charge to our customers and other interested parties.The right to print or copy this documentation, or any parts thereof, or to convert the same into electronicform shall be subject to our written permission.All rights reserved by us.When Quality Instrumentation Matterswww.m4instruments.comM4 Instruments131 S. Lombard Rd.Addison, IL 60101(630) 359-02502/13/12 Rev. 5