Reverse Osmosis Parts Portable PH Test Pen With Printed Plastic Housing
| measure range | resolution | accuracy | power supply |
| 0.00-14.00ph | 0.01ph | +/-0.01ph | 2*1.5v |
| operation temp | calibration | size | weight |
| 0-80C | two point automatic calibration | 153*29*16cm | 52g |
Attention :
The instrument need recalibrate in the following condition .
1 . Long time no use or use very long time after calibration .
2 . The electrode is used Very frequently .
3 . The testing accuracy requirement is very high .
4 . Press the "CAL" button long time in the air carelessly .
PH electrode maintenance :
If the electrode placed long time , and electrode exposed to air ,
then showing values is slow and not stable, because of electrode dry .
You should immerse the electrode into water for few hours .
PH meter works :
PH meter is a potential measurement method to measure the PH value of the solution , so PH meter work , in addition to measuring the PH value of the solution , it can also measure the battery's EMF . PH in Latin , is the abbreviation of Pondus hydrogenii , is the activity of hydrogen ions in the material , PH value is the hydrogen ion concentration logarithmic negative .
PH meter's main measurement component glass electrode and reference electrode , glass electrode is sensitive to PH , while the reference electrode potential is stable . The PH meter of these two electrodes together into the same solution , to form a galvanic cell , and the potential of the original battery , is the glass electrode and reference electrode potential algebra .
PH potential of the reference electrode is stable , then the temperature remains stable , the solution and the electrode composed of the original battery potential changes only with the glass electrode potential , and the glass electrode potential depends on the measured solution PH Value , so by measuring the potential changes , we can get PH PH value of the solution .
| PH range | 2-12.00PH (8680) , 0.00-14.00 (8681/8682) |
| Degree of analysis | 0.01 PH |
| Accuracy | ± 0.3PH (8680), ± 0.2pH (8681), ± 0.05PH (8682) |
| MV range | -499 to 499 |
| Degree of analysis | 0.1 mV (± 0.1 to 195.0) / ± 1 mV (± 190 to 499.0) |
| Operating temperature | 0 to 50 ° C (32 ° C to 122 ° F) |
| Working humidity | 0 to 80% RH |
| input resistance | 1012Ω |
PH meter structure :
PH meter structure , including composite electrode and galvanometer , composite electrode is what we call the reference electrode and reference electrode , in general , PH indicator electrode are glass electrodes . The function of the glass electrode is sensitive to hydrogen ions in the solution , and the potential difference is reflected by the change of the hydrogen ion . The role of the reference electrode is to provide a constant potential as a deviation from the reference potential .
PH meter components , the galvanometer is used to measure the overall potential , it can be great resistance in the circuit to capture a small potential changes , and the changes shown by the meter out . In order to facilitate reading , PH meter has a display function , that is , the output current meter into PH readings .
