Digital soil water temperature measuring instrument instruction manual

User main interface display

Press the ON/KEY button to display the welcome screen. Press the View button to display the following:

3, parameter setting interface

In the user settings interface, press the View button to enter the parameter setting interface as shown below:

a, time setting

The setting item is selected by the clear key, and the data is modified by the view key. At this time, press the save key to confirm that the save is successful. (Time setting range: 00:00 on 01 January 2010 to 23:59 on December 31, 2030, minimum time value is 1 minute)

★ b , full scale setting: Users are not allowed to use this setting.

c, automatically save settings

The data is modified by the view key. At this time, press the save key to confirm that the save is successful. (Set the time for automatic saving (00 to 60 minutes). When set to 00, it means to turn off the automatic saving function.)

Eight, test operation steps

1. Instructions for using the soil water temperature measuring instrument:

a, the measured force value is in the range of 0 ~ 10Kpa: it means wet, too high humidity for most crops.

b. The measured force value is in the range of 10 to 30 Kpa: it means wet, suitable for most crops to grow.

c. The measured force value is in the range of 30 to 50 Kpa: it means dry, and the wet crop has to be filled with water.

d. The measured force value is in the range of >50Kpa: it means dryness, and most crops need to be filled with water.

2. Soil water potential test method

a. Soak the water potential probe (ceramic head) in water for more than 3 hours before use.

b. Fill the plastic tube of the water potential probe with cold water and plug the rubber stopper. Drill holes with a soil drill to a predetermined depth at the selected embedding point. Pour about 5 mL of mud into the bottom of the hole and insert the water potential probe into the hole. The soil around the plastic rod is compacted. The depth of the water potential probe is calculated from the distance from the middle of the ceramic tube to the soil surface.

c. The water potential probe is buried in the moist soil for 1 hour, and after drying the soil for several hours, the soil water potential can be measured. When measuring, insert the air inlet of the water potential sensor into the socket on the upper left of the display, then turn on the power switch, press the “water potential” button, then the display will show “0”. If it is not “0”, press “clear” to the current The pressure value is set to zero reference point. The needles on the measuring cylinder are pierced into the rubber plugs of the water potential probes one by one, and the water potential data of each measuring point can be read from the display screen. The reading should be taken in the morning when the temperature changes little.

d. Turn off the power after the test is completed.

c, calculation:

Soil water potential (KPa) = water potential reading - probe water column height (cm) / 10.2

In the formula: 10.2: refers to the conversion factor of the water column height converted to kilopascals (KPa).

Probe water column height: refers to the height from the lower edge of the rubber stopper to the center of the ceramic head.

3, temperature measurement

During the measurement, insert the air inlet of the temperature sensing probe into the socket on the upper right of the display, then turn on the power switch of the display and press the “Temperature” button to insert the top of the temperature sensor into the position where the water needs to be measured. After 2 minutes, the reading can be made. If the soil is hard, use an iron rod to help punch the hole to the position you need to measure. Push the thank you button.

Nine, replace the battery operation steps

After using for a period of time, if the backlight function cannot be realized when the button is turned on after the power is turned on, and the function button cannot be operated normally, it means that the battery has been used up, and the new battery needs to be replaced.

1. Use a screwdriver to remove the 4 screws on the back of the rear cover of the monitor (as shown below) and remove the rear cover of the monitor.

2. After removing the back cover of the monitor, you will find that the battery inside the rear case of the monitor is installed, and the used battery is removed and replaced with a new battery.

3. Close the rear case of the display and the front case, and screw the four screws that were originally removed to complete the battery replacement.

Ten, matters needing attention, maintenance and repair

1. Water frequency of water potential probe

The water potential probe buried in the field will gradually increase the bubbles in the instrument. The rate of increase is related to soil dryness. To maintain the sensitivity of the instrument, periodically open the rubber stopper to fill the tube with water. The time interval between the first addition of water can be judged based on the measured soil water potential value:

When the measured soil water potential is in the range of 0 to 20 KPa, water is added once every 12 days.

When the measured soil water potential is in the range of 20 to 50 KPa, water is added once every 7 days.

When the measured soil water potential is in the range of >50 KPa, water is added for about 5 days.

Each time water is added, the reading is taken on the same day.

2, rubber plug replacement

The rubber plug of the water potential probe should be tight. The Piset is made of neoprene, which is not easy to age and has good elasticity. The cork after acupuncture will not leak. If the air leak occurs during long-term use, the rubber plug can be replaced. Each water potential probe is equipped with 3 pissors.

3, the replacement of the injection needle

If the needle breaks, replace it with a new one.

4. Do not tap the LCD screen to place the object on the LCD screen.

5. Do not press the function keys with nails, sharp objects or pointed objects.

6. Take it lightly during use and handling.

7. Do not disassemble, repair or modify the unit yourself. These behaviors can cause permanent malfunction of the instrument.

8. If the fault occurs, please contact the original purchase office or the company.

9. This product has a product quality problem within one month from the date of sale, in the normal use and appearance without damage, the customer with the original sales invoice, valid warranty card and complete packaging to the original purchase or the company to replace the same specifications For the model, the replacement product will continue the warranty period and terms of the original product.

10. This product is within one year from the date of sale. Under normal use, non-human failure is covered by the warranty (users disassemble or repair the company at other repair points and the warranty), the customer with the original sales invoice and valid warranty If you contact the original purchase office, you can get a free warranty for one year.

11. The warranty terms of this product are only applicable to TRS-II series products sold in the Chinese market. For products that exceed the replacement period and warranty period, customers can check the original purchase office for repairs or contact the company. Paid repairs.

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