pH metre sınıflandırma ve derece doğruluk
Göre ihtiyaçlar üretim ve yaşam, insanlar var bilimsel araştırılmış ve üretilmiş çok tip asitlik metre:
According to ölçüm doğruluk
It can be divided into {{{{0}}.2 level, {0.1 level, 0.01 level or higher precision.
By enstrüman ses seviyesi
It is splitd into pen type (mini type), portable type, desktop type type for online continuous monitoring and measurement.
According to the requirements of use
Pen tip (minyatür) ve taşınabilir pH pH metre vardır genel kullanılan müfettişler to getir onlar the site for inspection.
The doğruluk seviye of the pH meter seçili seçili uygunluk to the accuracy required by the user for measurement, and then çeşitli şekiller of pH metre seçili seçili uygun to kullanıcı kullanıcı uygunluk of the user.
◆According to portability, it can be divided into: portable pH meter, desktop pH meter and pen pH meter.
◆According to the purpose, 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 and digital display pH meter.
◆Kalem tipi pH metre is generally made into a single measureing range, and the measureing range is narrow. It is a special and convenient instrument.
Portable ve masaüstü pH metre var a geniş aralık ölçüm ve vardır yaygın kullanılan enstrümanlar. Fark o o taşınabilir olan güçlendirilmiş tarafından DC ve can be taşınan siteye. The laboratory pH meter has a wide measurement range, multiple functions and high measurement accuracy.
The endüstriyel pH metre is karakterize tarafından iyi kararlılık, güvenilir çalışma, kesin ölçüm doğruluk, güçlü çevresel uyarlanabilirlik, güçlü anti-parazit yetenek, ve has analog kilometre çıkış, dijital iletişim, üst ve alt sınır alarm ve kontrol fonksiyonlar.
level doğruluk
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 according to the graduation value (resolution or minimum display value) of its indicator (referred to as the electric meter), for example: an instrument with a graduation of {{0}}.1pH is called a 0.1-level instrument; the minimum display value is 0.001pH The instruments are called class 0.001 instruments, and so on. The accuracy of the instrument is 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 the glass electrode and the reference electrode. Starting from the actual use requirements, the division value of the electric meter is 0.1~0.001pH. If necessary, a more precise electric meter can be produced according to the current technological level. However, due to structural and manufacturing reasons, the performance of commonly used electrodes cannot reach a completely ideal level.
Hiçbiri tekrarlanabilirlik hata of the cam elektrot nor the stability of the solution junction potansiyel of the reference electrode is better than {{{{{{}}}}.01pH. Bu nedenle, no matter how high the resolution of the electrometer is, the test accuracy of the instrument is zor to be better than 0.01pH. Ancak, seçme a yüksek-çözünürlük enstrüman üstesinden gelebilme veya ortadan kaldırma etkisi elektrik sayaç on the test hata to the greatest extent. Since it is not a problem to make the electric meter achieve satisfactory accuracy, it is constantly innovating and improving terms of intelligence, humanization, reliability, easy operation and cost performance of the instrument. The relationship between the level of the acidity meter and its test accuracy is şartlı in the National Measurement and Verification Regulations forwe the acidity meter ( JJG119-84) as follows:
PH asitlik metre enstrüman seviye {{{0}}.2, {0.1, {0.02, 0.01, 0.001
Mezuniyet değer veya minimum ekran değer (pH) {{0}}.2, 0.1, {{{6}.{02, 0.01, 0.001
Metre endikasyon hata (pH) ±{{0}}.1, ±0.05, ±0.01, ±0.01, ±0.002
The toplam hata of destek test endikasyon (pH) ±{{{0}}.2, ±0.1, ±0.02, ±0.02, ±0.01
Note: The test range of supporting test should be controlled within pH{{{{}}}}}pH10. It can be seen from the above table that for the acidity meter below {{{{}}{{}}}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 endikasyon değer is 0.02pH; It can only reach ±0.01pH, and at this time, it is required to use a primary pH standard material to be garantili. (Not: Orada iki tip of pH ulusal standart malzemeler, birincil ve ikincil. Genellikle, the pH meter yaygın kullanılan is the secondary pH standard malzeme.)
