Pen type conductivity meter CD-989

Measurement range:0-19.99ms/cm

resolving power:0.01ms/cm

Accuracy:±2%F.S

Working voltage:4X1.5V（AG-13Type battery)

Work environment:0-50 RH<95%

Correction: One point correction

Volume:168X33X20cm

Weight:70can

Waterproof, low voltage prompt, data retention, large screen backlight

ØProduct Features

1Large LCD screen--More than twice the size of similar products, with clear indication;

2reasonable design--The electrode at the tip of the pen can be directly inserted into the mouth of a drinking water bottle for measurement, and the pen holder can be used as a container for the measured liquid, making it extremely convenient to use;

3Small sizeConvenient to carry and operate outdoors

4Fast measurement speed--Due to the exquisite bare sensing elements,5-30One measurement can be completed in seconds;

5Easy to clean--The electrode sheath can be removed for easy cleaning of the probe and sheath. (Probe made of titanium)

Østep

1Remove the protective cover.

2Lightly tap“ON/OFF”Switch on the power supply.

3Insert the conductivity meter into the measured solution until the liquid is slightly below“immersion line”The location.

4Gently shake the instrument and wait for the reading to stabilize before reading.

5After use, press“ON/OFF”Turn off the power, clean the electrode with distilled water or alcohol, and put on a protective cover.

ØBattery installation

If the display is blurry or not displayed, and there is a large error in the displayed value, the battery should be replaced in a timely manner. When replacing the battery, simply pull out the battery to replace it. pay attention to：Do not deform the battery contacts due to the polarity of the battery and the direction of the battery compartment.

Øapplied common sense

1After being stored for a long time, the conductivity value of purified water and mineral water will increase too much compared to the beginning, and the total number of co viruses and bacteria will also increase accordingly. At this time, it is not advisable to drink raw water, which will affect health;

2The conductivity value of pure alcohol is0, greater than0It indicates impurity;

3The conductivity of an aqueous solution is directly proportional to the amount of solid dissolved, so the smaller the displayed value, the lower the impurities in the water;

4、3Users above the building are supplied with water from the top water storage tank, which can easily cause secondary pollution. Therefore, it is necessary to regularly monitor changes in conductivity values and urge the property management department to clean regularly.

5How much laundry detergent should be placed in the washing machine? Testing with a conductivity meter can digitize the experience. After the cleaning process, if the reading detected before drainage is the same as that of tap water, it can be considered clean. If the reading exceeds tap water, the amount of laundry detergent should be reduced;

6If fruits and vegetables are soaked in water and their conductivity values are found to be high, chemical contamination may be suspected and should be taken seriously.

7During the process of swimming in the pool, changes in the cleanliness of the pool water can be measured, and excessive readings should be taken seriously;

8If the reading of deep well water is as high as300The above indicates that the impurity content is too high;

9Each region and city has different conductivity values due to differences in pipelines and water sources;

10Northern hard water contains calcium and magnesium ions, with high conductivity values, which can lead to scaling; Generally hard water150~400(scaling). Super hard water (if saltwater) is greater than400(Severe scaling) (limited to testing of pre treated water only).

11After the first preparation of flower fertilizer according to regulations, measure its value, and use this number to facilitate future preparation;

12The water used in the goldfish tank can be measured to determine its cleanliness level. If there is a significant blockage in the numerical value, water should be changed in a timely manner;

13The water used for marine aquaculture can be measured for its value, in order to facilitate future preparation and testing.

ØTips

1When measuring, gently shake the instrument a few times to avoid bubbles on the electrodes, otherwise it will affect the measurement results

2Instruments cannot be adjusted arbitrarily. Only when the instrument has been used for a long time or is used frequently, should it be recalibrated

3If encountering phenomena such as large reading errors, reading fluctuations, or readings not returning to zero, the instrument should be immersed in alcohol below the line and shaken a few times to clean the sensor. In low temperature or humid conditions, the displayed value does not return to zero (the last digit of the screen is loaded)2It will not affect the measured value.

ØConductivity meter values corresponding to various water qualities

When many customers call to inquire about conductivity meters, they will ask our company's technical personnel: What is the conductivity of ultrapure water

Less? What is the conductivity of ordinary tap water? Today, the administrator of Chengyuan Company will provide answers to the above questions. Convenient for both new and old users

Customer inquiries are also resolved!

1. Definition of conductivity EC and total dissolved solids TDS

Conductivity is the ability of a substance to transmit electrical current. It is opposite to the resistance value, that is, reciprocal to each other.

2. Unit of conductivity meter
The measurement unit of the conductivity meter is Siemens/cm (S/cm) Siemens, where 10-6 is expressed in μ S/cm and 10-3 is expressed in mS/cm

.

3. Conductivity meter of water:

Ultra pure water. .... 0.055μS/cm； Distilled water .... 0.5μS/cm ； Mountain spring water .... 1μS/cm ；
Tap water .... 50-800μS/cm ； Drinking water .... 1055μS/cm； Sea water .... 56mS/cm ；

Saltwater .... 100mS/cm ；

4. The conductivity EC of an aqueous solution is directly proportional to the dissolved solids (TDS) concentration, and the higher the solid concentration, the greater the conductivity.
The relationship between conductivity EC and dissolved solids TDS concentration is approximately expressed as: 1.4 μ S/cm=1ppm or 2 μ S/cm=1ppm (per million units)

CaCO3), where 1ppm is equal to 1mg/l, is the unit of measurement for total solid solubility.

In addition to conductivity meters, TDS instruments automatically convert conductivity values to ppm values and provide direct measurements of total solid dissolved concentration in the solution

The size of the conductivity determines the motion of molecules, and accurate measurements are necessary because temperature affects the motion of molecules
Temperature must be taken into consideration.
Therefore, for the purpose of comparing measurement results, the standard temperature is generally set at 20 ℃ or 25 ℃. To correct the influence of temperature, a temperature compensation coefficient β is used

express. The unit is%/℃, which varies with the measurement solution and is generally β=2%/℃