FAQ (Q&A) - pH/ORP Analyzers -

Frequently-asked questions - pH/ORP Analyzers -

| General ｜ pH Sensors ｜ pH Holders ｜ PH100 Panel Mount pH Analyzer ｜ PH450G 4-Wire pH/ORP Analyzer ｜ Personal pH Meter (PH71/PH72）｜

General

Q1	What is pH?
Q2	How is pH measured?
Q3	Principle of pH measurement using a glass electrode.
Q4	What is temperature compensation of pH meters?
Q5	What is temperature compensation (reference temperature conversion) of a test solution?
Q6	What is alkaline error?
Q7	What is acid error?
Q8	How is a pH analyzer calibrated with the standard solution?
Q9	What is zero calibration (asymmetry potential adjustment)?
Q10	What is span adjustment (electric potential gradient adjustment)?
Q11	What are the types and compositions of pH standard solutions?
Q12	How should pH standard solutions be stored, and for how long?
Q13	What are the conditions of a test solution?
Q14	What is MSDS?
Q15	What does "explosionproof' mean?
Q16	How can I check a pH analyzer in the field?
Q17	Is it possible to connect to a competitor's sensor?
Q18	Can pH and ORP be measured simultaneously?
Q19	What is the difference between a 2-wire transmitter and a 4-wire converter?
Q20	What is a relay terminal box for?
Q21	What is the ORP analyzer, and what is it used for?
Q22	How should the ORP analyzer be calibrated or checked?

Top of this page

pH Sensors

Q1	What types of pH sensors are available, and how are they selected?
Q2	What is the difference between the KCl non-replenish-type and the KCl replenish-type?
Q3	How should pH sensors be stored, and for how long?
Q4	What are the different types of glass electrode, and how should they be selected?
Q5	What are the different types of liquid junction, and how should they be selected?
Q6	What are the concentration and consumption of the internal solution (KCl solution)?
Q7	How safe is the internal solution (KCl solution)?
Q8	How should the earth electrode be selected according to its material?
Q9	What materials are used for the O-ring for pH sensors and how should they be selected?
Q10	What lengths of sensor cable are available?
Q11	What is the shape of the cable terminals of pH sensors and applicable analyzers?
Q12	What are the different types of KCL reserve tank and how should they be selected?
Q13	What methods are available for cleaning pH sensors and how are they selected?
Q14	Solid electrolyte pH sensors
Q15	pH sensors for chemical processes
Q16	Hydrofluoric acid-resistive pH sensors
Q17	When the cable length of the pH sensor is long, how can it be shortened? And if the cable is short, how can it be lengthened with another cable?
Q18	If the PH8EFP and PH8ERP are not going to be used for several months, how should they be stored?
Q19	When storing the glass electrode and liquid junctions of the PH8EFP and PH8ERP sensors as spares, how should they be saved and for how long can they be stored?
Q20	How often should maintenance be done? How often should the PH8EFP KCL be replenished? How often should it be calibrated?
Q21	Is it possible to replace the glass electrodes and replenish the internal liquids of the HA405 xerolyt, HF405 anti-hydrofluoric acid sensor, and DPA405 pH sensor for a chemical process?
Q22	There are two kinds of electrodes, "Gold" and "Platinum" in the OR8EFG and OR8ERG. How should they be used differently?

Top of this page

pH Holders

Q1	Please explain the holder types and applications.
Q2	What materials are used for the O-ring of holders and how are they selected?
Q3	How does the holder material depend on the temperature and pressure of the test solution?
Q4	What material of ultrasonic cleaning oscillator is best?
Q5	What is the maximum length of an immersion-type holder that you manufacture?
Q6	What are the considerations for the temperature, pressure, and flow rate of a test solution to be introduced to the holder for high-purity water?

Top of this page

PH100 Panel Mount pH Analyzer

* Discontinued in August 2011

Q1	What are the power supply specifications?
Q2	What is the transmission signal output?
Q3	What is transmission signal range?
Q4	What are the contact outputs?
Q5	How is error diagnosis performed?
Q6	Is it possible to connect a pH sensor using other than the dedicated pH sensor?
Q7	Can a holder other than the dedicated holder be used?
Q8	If the PH100 Panel Mount pH Analyzer is used in combination with a pH sensor other than the dedicated pH sensor, what relaying terminal box can be used?

Top of this page

PH450G 4-Wire pH/ORP Analyzer

Q1	What are the power supply specifications?
Q2	What is the transmission signal output?
Q3	What is the output range?
Q4	What are the contact outputs?
Q5	Can the output be held during cleaning or maintenance?
Q6	How is error diagnosis performed?
Q7	What relaying terminal box should be used?

Top of this page

Personal pH Meter (PH71/PH72）

Q1	What are differences between the PH71 Personal pH Meter and PH72 Personal pH/ORP Meter?
Q2	What are the types of sensors and how should they be selected?
Q3	What is the difference between the KCl non-replenish-type and the KCl replenish-type?
Q4	How should pH sensors be stored, and for how long?
Q5	How can I detect degradation of the pH sensor and its lifespan?
Q6	What is the concentration of internal solution (KCl solution)?
Q7	How safe is the internal solution (KCl solution)?
Q8	What sensor cables are available?
Q9	What are the causes of error messages and countermeasures?
Q10	What are the initial setting items?
Q11	How can data be stored?
Q12	What are the test solution conditions (temperature and conductivity)?
Q13	What is ORP sensor check?
Q14	Can the sensors of the PH71 meter and PH72 meter be connected to and used with the former models (PH81, PH82)?
Q15	Is it possible to purchase the electrodes of the previous models PH81 and PH82?
Q16	The sensor has been replaced because the prompt "CHECK SENSOR" has been displayed. However the prompt does not disappear.
Q17	How should the KCL replenish-free sensor be stored?
Q18	How long does it take for a pH meter to respond, and for the reading value to stabilize after being immersed in the calibration liquid?