pH - Typical Problems

Sensors are related to most pH problems.
• LOCATION: check with suppliers. Are there any existing connections? If so, which one?
What is the installation point where you will install the pH sensor?
• SENSOR TYPE: Often sensor technology is applied to a
wrong process, especially regarding pressure, temperature and pH options.
• All sensors will not perform at the same performance, despite what the specifications say.
Sensor styles on mounting and location should be optimized as well.
Involving a knowledgeable salesperson with numerous options will prevent future inconvenience.
• cleaning and calibration procedures are often nonexistent or not
Followed? All pH loops require regular maintenance, no matter what
provider.
Establishing preventive maintenance and procedures will prevent fluid material from impregnating the electrode tip of the pH sensor.
Are the sample collection system and the field ph sensor in the same pipe? If not, the sample may not represent the actual process. Poor location of the sensor can
add a long delay time for automatic pH control.
• final in-line calibration is not performed. Making a final calibration via comparison
with a new sample it can eliminate many errors. It's safe as long as you're sure
that the sensor is responding correctly beforehand.
• Temperature is not considered when comparing samples or for
control?
Process and laboratory pH changes in temperature!
In cold fluid applications, special sensors and special cables can be
needed. The sensor impedance doubles with each decrease of 8 ° C (and vice versa), in
low temperature there is little signal coming from the sensor.