Product description:
Stem flow is one of the subjects in the study of water balance in forest ecosystems. In hydrology, stemflow is the flow of intercepted water down the trunk or stem of a plant. Stem flow, along with through fall, are responsible for the transferral of precipitation and nutrients from the canopy to the soil. QT-Y/H stem flow collector is used to collect and analyze the stem flow.
Principle:
The system is composed of collecting units, a flow sensor and a data logger. It can continuously and automatically record the start time, end time and duration of stem flow, and also stem flow rate. The logged data can be export to excel or text file format to facilitate data processing.
Features
1. The system is suitable for all kinds of trunks. QT-Y is better for trunk diameter less than 14 cm, QT-H is for more than 14 cm.
2. It is easy to install and battery-powered, no need of external power supply.
3. The system is equipped with a sensor with high resolution of 4.13 ml
4. The data logger can record the air temperature when the stem flow is running.
Technical Parameters:
Recording range: 0 - 66000ml, resolution: 4.13ml;
Storage capability: 16,000 records;
Can set the start time and date;
Download mode: download data through the infrared downloader with USB interface
EEPROM memory, no data loss when power outage;
Fully-sealed data logger can be placed in the flow sensor device;
Internal LED lights indicate operating status;
The battery can last about 1 year.
Event resolution: 1 second;
Temperature measurement range: -20-70â??, temperature accuracy: 0.5â??, resolution: 0.1â??;
Time accuracy: ±1 munities/week;
The system is equipped with a protection case
Made in China
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Product description: This instrument is to measure plant stem strength against the wind. Users only need to push the instrument against the stem to get stem strength of the plant. Features: 1. This instrument has high measuring precision and high resolution. Two model - QT-DFA01 and QT-DFA02- are available for different plants; 2. Data can be shown on a big LCD with screen rotation function; 3. The instrument can be connected to computer for trial test, data downloading, printing and analysis. Several parameters such as input speed, area can be converted to displacement and pressure, respectively; 4. The instrument is equipped with various kinds of platens for convenient measurement; 5. It is easy to use, time saving, and of high precision; 6. The instrument can show remaining battery life and it can automatically power off when battery life is low. Technical Parameters: Model: QT-DFA01 QT-DFA02 Maximum load: 50N 500N Measuring units: Kgf/lb/N Precision: +/-0.2%F.S,+/-digit Display: 4-digits LCD display Measuring value: Peak and current value, peak value can be maintained Collecting rate: 1000 times/s D/A conversion: 16-bitÎ?Σtype Processor: 8-bit CPU Working temperature: -20â?? to 40â?? Power supply: NI-MH battery or exterior AC linear power adapter or USB power supply Data output: USB Auto power shutdown: 10 minutes without operations Battery alarm: Battery icon will flicker when battery life is low. Made in china
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