Soil hardness tester

Instrument Introduction

Soil compaction, also known as soil hardness, soil firmness, or soil penetration resistance. It is generally expressed in Pa as the resistance when a metal plunger or probe is pressed into the soil. Soil compaction refers to the ability of soil to resist external forces of compaction and fragmentation, and is one aspect of soil properties. In addition, soil physical properties include soil texture, structure, porosity, etc., which involve soil firmness, plasticity, permeability, drainage, water storage capacity, and difficulty of root penetration.

Soil compaction is composed of soil shear resistance, compression force, and friction force. It is a composite indicator of soil strength. There are two methods for measuring dynamic and static loads when metal plungers or probes are pressed into soil. The measurement values of different methods are different, but there is a connection. The shapes of plungers include cones, flat heads, balls, and wedges, which also affect the measured values. The measurement values for the same method are mainly determined by soil texture, bulk density, and moisture content. The influence of water content is significant. Soil compaction can predict soil carrying capacity, tillage ability, and resistance to root extension. The size of soil compaction can affect the perforation and growth of crop roots, and is an important soil physical property indicator used to evaluate soil tillage. Tight soil can prevent water infiltration, reduce fertilizer utilization, affect plant root growth, and lead to reduced crop yields.

technical parameter

1. Accuracy:+/-0.2% full scale+/-1 digit (number)

2. Measurement device: Kgf (gf)/lbf/N can be selected

3. Display: 5-digit LCD display screen – Device – Mode – Overload LED LCD display screen – Comparison LED LCD display screen (reversible)

4. Sampling speed: 1000 times/second

5. Display updates: 10 times<,>15 times

6. Overload capacity: 120% full range (LCD, LED flashing, and buzzer sound)

7. A/D converter: 16 bit signal

8. Microprocessor: 8-bit high-performance microprocessor

9. Battery operation time: It can be continuously used for about 10 hours when fully charged

10. Charging time: approximately 8 hours

11. Operating temperature: 0-40 ℃

12. Humidity range: 20%~80% RH relative humidity

13. Power supply: Internal NIMI rechargeable battery, AC adapter

14. Output: USB, RS232C, analog output

15. Output parameters: Analog (-2 to+2V), compare signals (- NG, OK,+NG), open collector MAX 30V 10mA, overload alarm output (OVL), open collector MAX 30V 10mA

16. Peak holding: pressure or tension

17. Comparison function: configurable high/low setting points with codes

18. Storage function: 999 measured values

19. Display flipping function: measurement values and measurement units

20. Alarm: Overload and+NG (optional off/on)

21. Other functions:

(1) Automatic zeroing (1-60 second setting)

(2) Damping mode (4 horizontal settings)

(3) The button sound can be turned off or on for selection

22. Automatic power cut-off function: selectable from 1 minute to 60 minutes

23. External connection switch: display hold, reset, and peak/tracking selection

24. Metrological calibration: can be calibrated independently to adapt to environmental changes

25. Gravity acceleration: can be adjusted for gravity acceleration

26. Dimensions and weight:

Host – length 220.5 x width 78 x height 32.3mm, approximately 520g

Host+Backboard+Handle – Length 230.5 x Width 90 x Height 44.5mm, Approximately 1150