PH meter, acidometer
PH meter, acidometer
pH meter, is a commonly used equipment, mainly used to accurately measure the pH value of the liquid medium, coupled with the corresponding ion selective electrode can also measure the potential of the ion electrode potential MV, pH meter is widely used in environmental protection, sewage treatment, research , Pharmaceutical, fermentation, chemical, aquaculture, water and other fields. The instrument is also a food factory, drinking water plant to do QS, HACCP certification in the necessary testing equipment. Category People according to the needs of production and life ... Details >>
pH meter, is a commonly used equipment, mainly used to accurately measure the pH value of the liquid medium, coupled with the corresponding ion selective electrode can also measure the potential of the ion electrode potential MV, pH meter is widely used in environmental protection, sewage treatment, research , Pharmaceutical, fermentation, chemical, aquaculture, water and other fields. The instrument is also a food factory, drinking water plant to do QS, HACCP certification in the necessary testing equipment.
classification
People in accordance with the needs of production and life, scientific research has produced many models of acidity meter:
Press measurement accuracy
Can be divided into 0.2, 0.1, 0.01 or more precision.
Press the instrument volume
Divided into pen (mini), portable, desktop and online continuous monitoring and measurement of online.
According to the requirements of use
Pens (mini) and portable pH pH meter is generally detected by personnel brought to the scene testing.
The pH level of the pH pH meter is determined by the accuracy required for the user's measurement and then the pH meter of various shapes is selected for ease of use by the user.
According to portability, divided into: portable pH meter, desktop pH meter and pen pH meter.
◆ divided by purpose: laboratory pH meter, industrial online pH meter.
◆ According to the advanced level is divided into economic pH meter, intelligent pH meter, precision pH meter or divided into pointer pH meter, digital pH meter.
◆ Pen pH meter, generally made of a single range, the measurement range is narrow, as a simple and convenient instrument.
Portable and desktop pH meter measuring a wide range of commonly used instruments, the difference is the use of portable DC power supply can be brought to the scene. Laboratory pH meter measurement range, multi-function, high accuracy.
Industrial pH meter is characterized by the requirements of good stability, reliable work, a certain degree of measurement accuracy, environmental adaptability, anti-interference ability, with the simulation of the amount of output, digital communications, the upper and lower limits alarm and control functions.
Level accuracy
The level of the acidometer and the accuracy of the instrument are two different concepts, and the level of the instrument is not exactly the same as its accuracy. The level of the acidity meter is indicated by the division value (resolution or minimum display value) of its indicator (abbreviated as electrometer), for example, the instrument with the division of 0.1pH is called the 0.1 level instrument; the minimum display value is 0.001pH The instrument is called the 0.001 level instrument, and so on. The accuracy of the instrument is the total error of the standard solution of the electrometer and the electrode matching test. It is not only related to the electrometer, but also relates to the glass electrode and the reference electrode. Demands from the actual starting point, the meter divides the value of 0.1 ~ 0.001pH, if necessary, according to the current state of science and technology, can produce more sophisticated electricity meter. However, due to structural and manufacturing reasons, the performance of the commonly used electrodes can not reach the completely ideal level. The repeatability error of the glass electrode and the solution junction potential stability of the reference electrode are not better than 0.01pH. Therefore, the high resolution of the meter, the instrument test accuracy is difficult to better than 0.01pH. However, choosing a high-resolution instrument can maximize or eliminate the effects of the meter on the test error. As the electric meter to achieve satisfactory accuracy has not been a problem, so the instrument is intelligent, humane, reliable, easy to operate and cost-effective continuous innovation and improvement. The relationship between the level of the pH meter and its test accuracy is specified in the National Metrology Verification Protocol for Acidity Meter (JJG119-84) as follows:
PH acidity meter level 0.2 0.1 level 0.02 0.01 0.01 level
Division or minimum display value (pH) 0.20.10.020.010.001
Electric meter indication error (pH) ± 0.1 ± 0.05 ± 0.01 ± 0.01 ± 0.002
The total error of the test results (pH) ± 0.2 ± 0.1 ± 0.02 ± 0.02 ± 0.01
Note: The test range of the auxiliary test should be controlled within the range of pH3 ~ pH10. As can be seen from the table above, for the following 0.01 acidity meter, the total value of the total error is equal to its level, for the 0.01 acid meter, the total error of 0.02pH, 0.001 for the acidity meter, the total error of indication Can only reach ± 0.01pH, but at this time need to use a pH standard material can be guaranteed. (Note: pH national standard substances are divided into two levels and two levels, the general pH meter is commonly used secondary pH standards.)
pH meter, is a commonly used equipment, mainly used to accurately measure the pH value of the liquid medium, coupled with the corresponding ion selective electrode can also measure the potential of the ion electrode potential MV, pH meter is widely used in environmental protection, sewage treatment, research , Pharmaceutical, fermentation, chemical, aquaculture, water and other fields. The instrument is also a food factory, drinking water plant to do QS, HACCP certification in the necessary testing equipment. Category People according to the needs of production and life ... Details >>
pH meter, is a commonly used equipment, mainly used to accurately measure the pH value of the liquid medium, coupled with the corresponding ion selective electrode can also measure the potential of the ion electrode potential MV, pH meter is widely used in environmental protection, sewage treatment, research , Pharmaceutical, fermentation, chemical, aquaculture, water and other fields. The instrument is also a food factory, drinking water plant to do QS, HACCP certification in the necessary testing equipment.
classification
People in accordance with the needs of production and life, scientific research has produced many models of acidity meter:
Press measurement accuracy
Can be divided into 0.2, 0.1, 0.01 or more precision.
Press the instrument volume
Divided into pen (mini), portable, desktop and online continuous monitoring and measurement of online.
According to the requirements of use
Pens (mini) and portable pH pH meter is generally detected by personnel brought to the scene testing.
The pH level of the pH pH meter is determined by the accuracy required for the user's measurement and then the pH meter of various shapes is selected for ease of use by the user.
According to portability, divided into: portable pH meter, desktop pH meter and pen pH meter.
◆ divided by purpose: laboratory pH meter, industrial online pH meter.
◆ According to the advanced level is divided into economic pH meter, intelligent pH meter, precision pH meter or divided into pointer pH meter, digital pH meter.
◆ Pen pH meter, generally made of a single range, the measurement range is narrow, as a simple and convenient instrument.
Portable and desktop pH meter measuring a wide range of commonly used instruments, the difference is the use of portable DC power supply can be brought to the scene. Laboratory pH meter measurement range, multi-function, high accuracy.
Industrial pH meter is characterized by the requirements of good stability, reliable work, a certain degree of measurement accuracy, environmental adaptability, anti-interference ability, with the simulation of the amount of output, digital communications, the upper and lower limits alarm and control functions.
Level accuracy
The level of the acidometer and the accuracy of the instrument are two different concepts, and the level of the instrument is not exactly the same as its accuracy. The level of the acidity meter is indicated by the division value (resolution or minimum display value) of its indicator (abbreviated as electrometer), for example, the instrument with the division of 0.1pH is called the 0.1 level instrument; the minimum display value is 0.001pH The instrument is called the 0.001 level instrument, and so on. The accuracy of the instrument is the total error of the standard solution of the electrometer and the electrode matching test. It is not only related to the electrometer, but also relates to the glass electrode and the reference electrode. Demands from the actual starting point, the meter divides the value of 0.1 ~ 0.001pH, if necessary, according to the current state of science and technology, can produce more sophisticated electricity meter. However, due to structural and manufacturing reasons, the performance of the commonly used electrodes can not reach the completely ideal level. The repeatability error of the glass electrode and the solution junction potential stability of the reference electrode are not better than 0.01pH. Therefore, the high resolution of the meter, the instrument test accuracy is difficult to better than 0.01pH. However, choosing a high-resolution instrument can maximize or eliminate the effects of the meter on the test error. As the electric meter to achieve satisfactory accuracy has not been a problem, so the instrument is intelligent, humane, reliable, easy to operate and cost-effective continuous innovation and improvement. The relationship between the level of the pH meter and its test accuracy is specified in the National Metrology Verification Protocol for Acidity Meter (JJG119-84) as follows:
PH acidity meter level 0.2 0.1 level 0.02 0.01 0.01 level
Division or minimum display value (pH) 0.20.10.020.010.001
Electric meter indication error (pH) ± 0.1 ± 0.05 ± 0.01 ± 0.01 ± 0.002
The total error of the test results (pH) ± 0.2 ± 0.1 ± 0.02 ± 0.02 ± 0.01
Note: The test range of the auxiliary test should be controlled within the range of pH3 ~ pH10. As can be seen from the table above, for the following 0.01 acidity meter, the total value of the total error is equal to its level, for the 0.01 acid meter, the total error of 0.02pH, 0.001 for the acidity meter, the total error of indication Can only reach ± 0.01pH, but at this time need to use a pH standard material can be guaranteed. (Note: pH national standard substances are divided into two levels and two levels, the general pH meter is commonly used secondary pH standards.)
