Xylem CG 839 - Manual (Page 7)

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13 Error messages
<>: Overshoot of the measuring range. This error message disappears again automatically
when the reading returns to within the measuring range.
<>: The response time of the electrode is too long (greater than 1 minute). This error message
appears during the calibration procedure. Usually the cause is that the electrode has not
been watered properly or is too old. <> also appears when no electrode is
connected.
<>: A buffer solution which does not correspond to the pressed -key has been used. To
cure this error, press the correct key.
<>: The temperature during calibration lies below 0 °C or above 100 °C. Correct the
temperature to lie within this range.
<>: The same - key has been pressed twice. This error message disappears after
pressing the correct - key.
<>: The slope of the electrode is less than 85 % or more than 105 % of the theoretical value.
<>: The zero-point of the electrode lies below pH = 5.5 or above pH = 8.0. Change electrode.
14 Battery replacement
Changing of batteries may be done only by the manufacturer.
15 Safety warnings and instructions
The Microprocessor pH Meter CG 839 may be used only for the purposes described in these operating
instructions.
The nominal pH-values of the buffer solutions used for calibration must correspond exactly to the pH-
values marked on the -keys.
The warranty becomes void in the case of unauthorised tampering inside or damage to the
Microprocessor pH Meter CG 839.
The repair of the Microprocessor pH Meter CG 839 may be done only by the manufacturer.
Please also observe the operating instructions for the units to be connected.
Please take note of the enclosed certificate of conformity from Physikalisch-Technische Bundesanstalt
PTB Nr. Ex-90.C.2012 (a german administrative body).
16 Declaration by the manufacturer
We certify herewith that the Microprocessor pH Meter CG 839 is equipped with radio frequency
interference suppression in accordance with the stipulations of the Official Bulletin Amtsbl Vfg 1046/1984.
Commercial distribution of this unit has been reported to the German Federal Post Office which has been
given the right to check the serial production for compliance with the regulations.