Seek solutions for fault code M136 of the E+H pH meter CM42 transmitter
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Does anyone know what checks need to be done to address the fault code M136, which indicates an issue with the zero point, in the E+H pH meter CM42 transmitter?
It has been in use for 16 months; it is a clear water tank for wastewater discharge, with a pH level between 6.5 and 8.2, indicating excellent operating conditions.
Only the lower limit alarm at zero is triggered; if the surface is clean, there’s no need to pay attention to it as it does not affect the measurement output. As long as both the slope and zero alarms do not occur simultaneously, these two alarms can be used as a reference for preventive maintenance of the electrodes.
Clean the probe, then prepare some calibration solution by yourself and calibrate it. Two-point calibration can also be used.
It has been calibrated, but it doesn’t work. The cause at the site has been identified: it is due to a lack of buffer solution inside the glass bulb of the electrode, with the glass at the sealing ring at the end of the glass electrode being broken.
The cause has been identified: it was due to a lack of buffer solution inside the electrode’s glass bulb, with the glass at the sealing ring at the end of the glass electrode breaking.
Oh, applying too much tightening torque when installing the glass electrode can easily cause damage to the electrode