Liquid PH 0-14 Value Detection Regulator Sensor Module Monitoring Control Meter Tester + BNC PH Electrode Probe

The refillable pH compound electrode has a refill hole in the electrode shell, so that the refill hole can be opened to refill the KCl solution when the electrode's external reference solution is lost. The non-refillable pH composite electrode is filled with gel-like KCl, which is not easy to lose and has no refilling hole.

Chargeable pH composite electrode is characterised by high penetration rate of the reference solution, stable and reproducible liquid-junction potential and high measurement accuracy. And when the reference electrode is reduced or contaminated can be supplemented or replaced KCl solution, but the disadvantage is that the use of more trouble. Rechargeable pH composite electrode should be used to add liquid hole open, in order to increase the liquid pressure, accelerate the response of the electrode, when the dielectric liquid level is lower than adding liquid hole 2cm, it should be timely replenished with new dielectric liquid.

Non-refillable pH composite electrode is characterised by simple maintenance and ease of use, so it is also widely used. However, when used as a laboratory pH electrode, under long-term and continuous use conditions, the KCl concentration at the liquid junction will decrease, affecting the test accuracy. Therefore non-rechargeable pH composite electrode should be immersed in the electrode soaking liquid when not in use, so that the electrode performance will be very good during the next test, and most of the laboratory pH electrodes are not long-term and continuous testing, so the impact of this structure on the accuracy is relatively small.

Product Description:

Working voltage: 5±0.2V (AC DC)

Working current: 5-10mA

Detectable concentration range: PH0-14

Detecting temperature range: 0-80℃

Response time: ≤5S

Settling time: ≤60S

Component power: ≤0.5W

Operating temperature: - 10 ~ 50 ℃ (nominal temperature 20 ℃)

Humidity: 95 % relative humidity (nominal humidity 65 % relative humidity)

PH test module size: 42mm*32mm*20mm

Output: Analogue voltage signal output

With 4pc M3 mounting holes

PH electrode probe use, care and maintenance :

I: Preparation before use

1, gently remove the protective bottle from the top of the electrode and put it away for spare.

2、Wash the white sedimentary salt outside the electrode with deionised water.

3, in order to maintain a proper penetration rate, the liquid level inside the tube does not exceed the end of the spiral glass tube, and at least 1 inch (2.5cm) above the sample liquid level, the use of the electrode bulb end placed in the measured liquid, so that the bulb and the measured liquid in full contact with the ionic reaction effect.

4, gently shake the electrode, (like shaking the thermometer) to remove the air bubbles inside the electrode.

5. Soak the electrode in pH electrode storage solution for 1 hour. If electrode storage solution is not available, add 1 g KCl to 200 mL of pH 7 buffer as a temporary electrode storage solution. When the electrode is not in use, a long term storage solution can be prepared to activate and protect the bulb end. To prepare the solution, add 10 mL of 3.3KCl to 200 mL of pH4 buffer. [3.3KCL for saturated potassium chloride, configuration method weighing 23 grams of potassium chloride to 100ml of deionised water] appropriate amount of preservatives

II: Precautions for the use of electrode probe

1、Use fresh buffer

2、Open the electrode protective sleeve

3、In between measurements, rinse the electrode with deionised water.

4、 Stir the buffer and sample: a) Always stir at the same rate; b) Stir first, and then measure.

5. When preparing the pH electrode, rinse the electrode with distilled water before and after measurement. Use a linen-free cloth to remove excess water from the electrode head and avoid rubbing the electrode bulb, otherwise static electricity will be generated, interfering with the pH measurement.

6. Ensure that the buffer is at the same temperature as the sample. If the sample temperature is different, please use the temperature compensation probe for temperature compensation.

7、 Check the electrode slope regularly with two-point correction method. When the electrode reading drifts or the slope is lower than 92%, please refer to the cleaning of the electrode to clean the electrode.

III: Maintenance of electrode probe

1、Cleaning of electrode

Universal cleaning solution - soak the electrode in 0.1M HCl or 0.1M HNO3 solution for 15 minutes, then soak the electrode in the electrode storage solution for 30 minutes.

2. Liquid Junction Blockage (Salt Precipitation)

Causes: Hard water, mud, organic dirt, microorganisms floating in the water, moss and so on. Adheres to the water-permeable sand core around the bulb and PTFE, resulting in the external reference electrode not working properly.

Solution: Soak the electrode in hot water (60°C) for 15-20 minutes; soak the electrode in hot saturated KCl (60°C) solution for 20-30 minutes and allow to cool to room temperature; soak the electrode in pH 4 buffer for 20-30 minutes.

Check for excessive crystallisation, if so, rinse crystals repeatedly with deionised water and check for normal flow rate.

If not, soak the electrode in hot water (60°C) for 15-20 minutes; soak the electrode in hot saturated KCl (60°C) solution for 20-30 minutes and cool to room temperature; soak the electrode in pH 4 buffer for 30 minutes. Soak the electrode tip in concentrated HCl for 5-10 minutes, rinse the electrode, and check for normal electrolyte flow. If the liquid junction is still blocked, pull the liquid junction (do not touch the glass bulb).

4: Precipitation of inorganic substances on pH sensitive membrane

Cause: Inorganic sample measurement

Solution: Clean with EDTA, ammonia or acid.

5: Dehydration of pH sensitive membrane

Cause: Improper storage, prolonged use, high-temperature operation or strong alkaline solution, resulting in slow and unstable response.

Solution: Activate the electrode

Soak the electrode in 0.1 M HCl for 1 minute, rinse with tap water for 30 seconds, soak the electrode in 0.1 M KOH for 1 minute, rinse with tap water for 30 seconds, calibrate the test electrode with the buffer, if it still doesn't work, repeat the above steps up to 3 times.

6: The PH electrode is used for a long time, and the electrode is not properly cleaned and maintained under the measured environment, which leads to unstable electrode data and other factors. Solution, when the electrode is used for 2-3 months, clean the bulb of the electrode once, and do a check on the liquid connection part. Solution, take the electrode out of the use environment, see if there is any dirt on the surface of the bulb, if there is, you can use ethanol cotton to wipe it lightly, and then use deionised water to clean it.