A pH meter is an electronic device used for measuring the pH which is either the concentration of ions in an aqueous solution or the activity of the ions in an aqueous solution. The pH will indicate if the solution is acidic or basic, but is not a measure of acidity or alkalinity. pH meters work in liquids though special probes are sometimes used to measure the pH of semi-solid substances. A pH meter consists of a special measuring probe (a glass electrode) connected to the body which measures and displays the pH reading.
Feautres:
1. Data hold, Max & Min measurement function.Specifications:
| Product Specification | ||
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Instrument Level: |
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Grade 0.01 |
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PH Measuring range: |
PH 0.00~14.00pH |
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PH basic measurement error: |
± 0.05pH |
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Instrument Repeatability： |
±0.03pH |
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Solution temperature compensation range: |
0 ~ 60°C |
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instrument repeatability |
0.03pH |
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mV measuring range: |
-1400mV±1400mV |
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temperature range: |
-10 ~ 60 ; 0.1°C |
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Battery: |
9V Battery (not include) |
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Display: |
Large LCD segment type display with back light |
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Working temperature: |
0 ~ 35°C |
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Working humidity: |
0-80% R H ( Non Gel) |
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Product Net Weight |
205g |
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Product Size |
159*66*31mm |
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Packing contents |
1. AS218 type electronic unit 1 pc; 2. Ph composite electrode:general purpose and field usage. 12.3mm diia.X 160mm.plastic body*1pcs 3. PH4.00, PH6.86, PH9.18 calibration power*2 bags ench type(see picture) 4. electrode liquid storage bottle:*1pc5. instruction manual and warranty card:one set each |
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| Normal Condition of Use | ||
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(1) |
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the environment temperature (0 ~ 35) ; |
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(2) |
the relative humidity is not more than 80%; |
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(3) |
measured solution temperature: (5 ~ 60 ); |
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(4) |
power supply: 9V DC battery X 1pc (006P); |
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(5) |
no significant vibration; |
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(6) |
in addition to the earth's magnetic field without external magnetic field outside interference. |
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Open the battery door that located at the back of theinstrument, insert a new 9V battery into this compartmentwith correct polarity. If you have replaced with a new PHcompositeelectrode, please do the calibration before usethis unit to measure.
If measuring interval time is short, one month calibrationonce is enough.| User's Guide | |
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① |
Press “MODE” key go to three different calibrationmode [CAL 1], [CAL 2] and [CAL 3]. |
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② |
according to the "mode" button instrument into the correction state, respectively into "C4.0" "C6.86" "C9.18" three states cycle scintillation indicating symbol. |
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③ |
Correction steps are as follows: A: PH4.00 buffer solution calibration: Press “MODE” key go to [CAL 1] icon shown and flashing, rinse the PH electrode with distilled water, immerse the electrode in the PH4.00 buffer solution, wait for the electrode become stable, you should find the value of mV don't change and state at same value, this time press [CAL ] key more than 3 seconds. until [4.00] flashing stop and disappeared, so the PH4.00 calibration completed. B: PH6.86 buffer solution calibration: Press “MODE” key two times go to [CAL 2] icon shown and flashing, rinse the PH electrode with distilled water, immerse the electrode in the PH6.86 buffer solution, wait for the electrode become stable, you should find the value of mV don't change and state at same value, this time press[CAL ] key more than 3 seconds.until [6.86] flashing stop and disappeared, so the PH6.86 calibration completed C: PH9.18 buffer solution calibration: Press “MODE” key three times go to [CAL 3] icon shown and flashing, rinse the PH electrode with distilled water, immerse the electrode in the PH9.18 buffer solution, wait for the electrode become stable, you should find the value of mV don't change and state at same value, this time press[CAL ] key more than 3 seconds.until [9.18] flashing stop and disappeared, so the PH9.18 calibration completed. |
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④ |
normal measurement mode: The factory default mode is normal measuring mode if you press [ the power on/off ] button to turn it on. At this normal measure mode, the unit can measure the PH and environment temperature at the same time, just immerse the electrode into the solution that you want to measure the PH value mV measure mode:Press 'MODE” key four times go to mV measure mode,which enable you to measure the ion –selective, ORP(oxidation—reduction potential) and other precise mV measurements. At that mode LCD display screen show mV and ambient temperature at the same time. |
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⑤ |
If the battery power indicator icon become empty,please replace a new 9V battery immediately, If the instrument will not be use in a long period, please take out the battery from the battery compartment to prevent any leakage of the battery to damage the instrument. |
| In the following circumstances, Instruments Must be to correction: | |
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① |
The solution temperature have a large difference with the calibrated temperature |
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② |
PH electrode took off from the liquid storage bottle too long time. |
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③ |
Replaced with a new PH electrode |
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④ |
After measured at high concentration acid (PH<2) or alkali (PH>12) solution |
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⑤ |
After measured fluoride solution and acidity within PH<7 or concentrated organic solution |
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⑥ |
When calibrate, please make sure the buffer solution temperature must be 25°C± 2°C |
