Telecontrol equipment and systems; part 3: interfaces (electrical characteristics); IEC 60870-3:1989; german version HD 546.3 S1:1991
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Telecontrol equipment and systems; part 4: performance requirements (IEC 60870-4:1990); german version HD 546.4 S1:1992
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pH measurement - Measuring methods with potentiometric cells - Terms and definitions
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pH measurement - Plug socket and plug shielded for pH electrodes and pH combination electrodes
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Draft Document - pH measurement - Reference buffer solutions for the calibration of pH measuring equipment
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Standard buffer solutions for calibrating pH measuring equipment
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Draft Document - pH measurement - Technical buffer solutions, preferably for the calibration of technical measuring installations
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