Klasifikacija i stupanj točno od kiselina-baza koncentracija metar
Accord to the needs of production and life, people have scientifical researched and produced many types of acidity meters:
Prema to mjerenje točnost
It can be divided into {{{0}}.2 level, 0.1 level, 0.01 level or higher precision.
Prema to the volume of the instrument
It is divided into pen type (mini type), portable type, desktop type and online type for online continuous monitoring and measurement.
Prema to the zahtjevima of use
Tip olovke (minijatura) i prijenosni pH meters are općenito korišteni by inspektori to bring them to the site for inspekcija.
The accuracy level of the pH meter selected accord to the accuracy required by the user for measurement, and then various shapes of pH meters are selected accord to the convenience of the user.
◆According to prenosivost, it can be divided into: portable pH meter, desktop pH meter and pen pH meter.
◆According to the application, it is divided into: laboratory pH meter, industrial online pH meter, etc.
◆According to the advanced level, it can be divided into economical pH meter, intelligent pH meter, precision pH meter or pointer pH meter or pH meter , pH meter digital display meter.
◆The tip-pen pH meter is općenito made into a single range and has a narrow measurement range. It is a special and convenient instrument.
Portable and desktop pH meters have a wide range of measurement and are commonly used instruments. The difference is that the portable pH meter uses DC power supply and can be nosi to the site. The laboratory pH meter has a wide measurement range, multiple functions and high measurement accuracy.
Industrial pH meters are characterized by good stability, pouzdan operation, certain measurement accuracy, strong environmental adaptability, and strong anti-interferen ability. They analog meter output, digital communication, upper and lower limit alarm and control functions, etc.
razina točnost
The level of the acidity meter and the accuracy of the instrument are two different concepts, and the level of the instrument is not completely consistent with its accuracy. The level of the acidity meter is expressed accord to the gradation value (resolution or minimum display value) of its indicator (referred as the the electric meter), for example: an instrument with a graduation of {{{{{{}.1pH is pozvan a 0}.1-Level instrument; The Minimum Display Value Is 0.{{{{{}}}1pH The instruments are called class 0.001 instrumenti, and so on. The accuracy of the instrument is the the comprehensive error of the electrometer and the electrode matching test standard solution, which is not only related to the electrometer, but also more related to to the glass electrode and the reference electrode. Starting the actual use requirements, the division value of the electric meter is 0.1~0.001pH. If Required, a more precise electric meter can be proizveden accord to the current technological level. Međutim, due to structurn and Manufacturing reasons, The Performance of Commonly Used Electrodes Cannot Reach A A Total Ideal Level.
Neither the ponovljivost pogreška of the staklo elektrode nor the stability of the solution junction potential of the reference electrode is better than {{{{0}.01pH. Therefore, no matter how high the resolution of the electrometer is, the test accuracy the the instrument is difficult to be better than 0.01pH. Međutim, choose a high-resolution instrument can overcome or eliminate the influence of the electric meter on the the test pogreška to the greatest extent. Since it is not a problem to make the electric meter achieve zadovoljavajuće točno, it is is constantly inovating and imimproveing in terms of intelligence, humanizacija, pouzdanost, Pouzdanost, Easy Operation And Cost Performance The The instrument. The relationship between the level of the acidity meter and its test accuracy is stipulated the the National Measurement and Verification Regulations for the acidity meter ( JJG119-84) as follows:
PH kiselost mjerač instrument razina {{{0}.2, 0.1, 0.02, 0.01, 0.001
Stupnjeva vrijednost ili minimum prikaz vrijednost (pH) {{{0}}.2, 0.1, 0.02, 0.01, 0.001
Električni mjerač indikacija (pH) ±{{{0}.1, ±0.05, ±0.01, ±0.01, ±0.002
Supporting test indikacija total error (pH) ±{{{0}.2, ±0.1, ±0.{{8}2, ±0.02, ±0.01
Napomena: The test range of the matching test should be controlled within pH3~pH1{0. It can be seen from the above table that for the acidity meter below 0.{}1 grade, the total error value of the indication is equal to its grade; for the acidity meter of 0.01 grade, the total error of the indication value is 0.02pH; It can only reach ±0.01pH, and at this time, it is necessary to use a a primary pH standard material to be zajamčeno. (Napomena: There are two types of pH national standard materials, primary and sekundar. Općenito, the pH meter commonly used is the secondary pH standard material.)
