12
* Communications protocol
(1) pH display and the temperature (positive) display:
(2) pH display and the temperature (negative) display:
(3) mV display (positive voltage) and the temperature (positive) display
(4) mV display (negative voltage) and the temperature (positive) display
(5) mV display (resolution: 1 mV) and the temperature (positive) display
(6) The sensor probe is not connected (pH display: error, temperature display: 25.0)
Example) When the pH is 7.55 and the temperature is 25.2°C, the RS-232C output is as follows.
Troubleshooting (error codes)
Some of the following phenomena may not be considered defective. The symbol "-->" indicates the reference
clauses.
Problem
Possible cause
Action
The power is not turned
on.
The battery has run out its power.
Replace with new battery (-->Installing and
replacing battery)
The power to the unit is
turned off.
The auto power-off is turned on.
Cancel the auto power-off on the main unit.
(-->Before measuring)
Error code
pH display section
The sensor probe is not connected
to the main unit.
Connect the sensor probe to the main unit.
Securely lock the BNC connector in place.
The glass electrode of the sensor
probe is dirty or dry.
Wash the glass electrode of the sensor probe.
(-->About the glass electrode)
If the problem remains after checking the connection between the main unit and the
sensor and after washing the glass electrode, the sample to be measured may be pH
0 or lower.
Error code
pH display section
The sensor probe is not connected
to the main unit.
Connect the sensor probe to the main unit.
Securely lock the BNC connector in place.
The glass electrode of the sensor
probe is dirty or dry.
Wash the glass electrode of the sensor probe.
(-->About the glass electrode)
Summary of Contents for 6400-00
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