ปากกาวัดค่า PH สีเหลือง (รุ่น ATC pH-2011 ความแม่นยำสูงสุด ชดเชยอุณหภูมิอัตโนมัติ หน้าจอมี Back Light) สินค้าได้ทำการ calibrated ให้เรียบร้อยแล้ว + Free PH Buffer Powder 2 ซองในกล่อง
หมายเหตุ:
ปากกาวัดค่า PH น่าตาเหมือนกันมีหลายรุ่น รุ่นที่ร้านเรานำเข้ามาจำหน่ายเป็นตัว Top ที่มีความแม่นยำสูงสุด
measuring range 0.00-14.00 PH resolution 0.01 pH accuracy ± 0.1pH
Automatic temperature compensation 0 ℃ -55 ℃
Power supply 3 × 1.5v (LR44 button battery)
Use environment 0 ~ 50 ℃
Volume 152 × 29 × 15mm
Weight 120g Bare metal about 60g
PH pen We have all calibrated before shipment. After receiving, no need to calibrate, we can directly use
Technical Specifications:
- Measuring range: 0.00-14.00PH
- Accuracy: ±0.2PH ±0.1PH (20°C)
- Resolution: 0.1PH
- Working temperature: 0°C~50°C
- Battery: 3X1.5V (AG13 button battery)
- Dimensions: 142mm (L) × 29mm (W) × 15mm (H)
- Weight: 51 grams (about 120g plastic box)
Professional tips: First, the thinner the glass electrode, the higher the accuracy
the benefits of calibration powder: calibration powder shelf life of 5 years, and the calibration solution does not open, only a month later will also produce moss, and the standard requirements for calibration is to be calibrated with 250ml distilled water (supermarket sold), calibratable solution The bottle is only about 20ml, which is not up to the requirement. When the pen is placed in the bottle for calibration, the bottle mouth is too small to be put in. The opened calibration solution can only be discharged after 15 days, so the bottled calibration solution is equipped. We do not recommend it.
There is no pH pen without correction, but the calibration is very simple
The pH meter must be recalibrated under the following conditions:
- It has been used (or placed) for a long time after calibration;
- The electrode is used frequently;
- The measurement accuracy is relatively high.
- New pens to buy back is not required to calibrate
Calibration of pH meter:
- Flush the calibration powder with 250ml distilled water or purified water. The pH electrode was immersed in a mixed phosphate standard buffer solution having a pH of 6.86 (or 4.0) and gently shaken.
- with a small yellow screwdriver, facing the round hole behind the pH pen, turn left and right to adjust the correction potentiometer until the display value and the standard buffer solution at ambient temperature ph value of 6.9 (or 4.0).
Do not stain the syrup. After calibration, seal it with plastic wrap. It can be reused. After the calibration, wash it with pure water. If it is not used frequently, it can be calibrated in March-June!
How to maintain the pH pen:
If you don't use it for a long time, you can soak the pH pen electrode in pure water in about half a month and insert it in a disposable cup!
Steps:
1. Remove the protective cover.
2. Turn on the switch located on the battery compartment.
3. Insert the pH meter into the liquid to be tested until the liquid is immersed in the “immersion line”. If possible, allow the solution to immerse slightly above the “immersion line”.
4. Gently stir the solution and wait for about two minutes. Read the displayed value.
5, use is complete. Clean the electrode. Turn off the switch. Put on the protective cover.
PH hazard in aquaculture water and important indicators for controlling water quality measurement
■Ph change PH value increases → Indicates that there are many phytoplankton in the water, strong photosynthesis, high dissolved oxygen concentration in water, low
pH value , water quality deterioration, and dissolved oxygen which performed.
Biophotosynthetic, respiration and various chemical changes in water can cause changes in pH, and its changes have a great impact on fish, shrimp, crab and water quality. Impact on water quality: When the pH value is ≤6, the sulfides only exist in the form of hydrogen sulfide, which increases the toxicity of the sulfides, and the water bodies are prone to hypoxia; when the pH value is ≥8, a large amount of NH4+ is converted into toxic NH3. .
■PH is too high or too low to cause symptoms of poisoning.
Alkaline poisoning symptoms:
fish: stimulated and maddening; a lot of mucus on the body surface can even be pulled into silk; the lid is corroded and damaged, and a large amount of secretions are coagulated in the ankle; When PH>9, there will be many dead algae and dying algae cells in the water.
Shrimp: The prawn sputum tissue is damaged, black rickets occur, and then evolve into rot disease, jaundice and red rickets → ventilating obstruction, suffocation and death.
Symptoms of acidosis:
fish: body color is obviously white; aquatic plants appear brown or white; water transparency is significantly increased; there are many dead algae and dying algae cells in the water.
Note: In addition, if a fish is rapidly transferred from a body of water to a body of water with a large difference in pH, even if the pH of the second body is within the tolerance of the species, it may cause shock and death of the fish.
■ PH value control standard
"fishery water quality standards" stipulates: the pH value of marine aquaculture is generally controlled between 7.0-8.5, and the pH value of freshwater aquaculture should generally be maintained between 6.5-8.5. In actual aquaculture, the pH is controlled between 6.5 and 9.0, not higher than 9.2; marine aquaculture is between 7.5 and 8.5, and the daily difference should not be greater than 0.5. When the pH is below 4 or above 10.6, the fish, shrimp and crab cannot survive.
■ Prevention of PH value
prevention: Always check the change of pH value of water body, preferably every morning and evening. Once an abnormality occurs, it is necessary to find out the cause and take effective treatment measures.
Control measures: 1) If the water is acid (PH<6.5), it can be adjusted by adding alkaline water quality regulator such as quicklime or sodium hydroxide; change the water properly; “fertilizer water” or “fertilizer water” together with “special effect fertilizer water” The paste can be used to rapidly proliferate phytoplankton. 2) If the water is alkaline (PH>9.5), the “green source” is applied to the whole pool, which can increase the usage, and then use the “Bottom Change King”, “Water Transfer Probiotics”, “Bacteria” or “EM”. The bacteria are used to improve the water quality; if there are too many plants floating in the water, the green color source or the water-producing probiotics are used to control the water color too thick. Those who have the condition can change some water and inject new water first.