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DIN 19244-3
Telecontrol equipment and systems; part 3: interfaces (electrical characteristics); IEC 60870-3:1989; german version HD 546.3 S1:1991
DIN 19244-4
Telecontrol equipment and systems; part 4: performance requirements (IEC 60870-4:1990); german version HD 546.4 S1:1992
DIN 19261
pH-Messung - Messverfahren mit Verwendung potentiometrischer Zellen - Begriffe
pH measurement - Measuring methods with potentiometric cells - Terms and definitions
DIN 19262
pH-Messung - Steckbuchse und Stecker geschirmt für pH-Elektroden und pH-Messketten
pH measurement - Plug socket and plug shielded for pH electrodes and pH combination electrodes
DIN 19265
pH-/Redox-Messung - pH-/Redox-Messumformer - Anforderungen
pH-/redox-measurement - pH-/redox measuring apparatus - Technical requirements
DIN 19266
pH-Messung - Referenzpufferlösungen zur Kalibrierung von pH-Messeinrichtungen
pH measurement - Reference buffer solutions for the calibration of pH measuring equipment
DIN 19267
pH measurement - Technical buffer solutions, preferably for the calibration of technical measuring installations
DIN 19268
pH-measurement - pH-measurement of aqueous solutions with pH measuring chains with pH glass electrodes and evaluation of measurement uncertainty