1. The instrument consists of well logging, precise digital water level gauge, submersible pump, data acquisition and control box. For automatic measurement of record runoff. This instrument consists of 1 log, logging 2 (the instrument whose resolution is 0.1 L / min, the measurement accuracy is less than 1%, stable and reliable performance is far better than other forms of runoff.). The control box is equipped with PC communication interface, and can be connected with the computer. Automatic plotting of runoff process curve from upper computer. This instrument can be used with JFZ-01 type digital gauge is used for automatically recording, and on the basis of precipitation runoff process curve, precipitation process curve to calculate runoff critical rainfall (rainfall).

2. Main technical parameters
(1) runoff measurement range: 0-20 liters / min.;
(2) water level scoring discrimination: 1mm;
(3) logging diameter: 360mm; well depth: 100cm;
(4) the resolution of runoff measurement is 0.1 liters;
(5) the measurement accuracy: less than 1% (range: 20 liters / min);
(6) power supply voltage: 220V- + 15%
(7) clock accuracy: less than 4 minutes per month
(8) display parameters: logging water level unit: mm;
Instantaneous flow: Rise / min;
Hourly cumulative flow: Rise / hour;
Daily flow: Rise / day;
Time: month, day, minute, second;

3, system equipment configuration:
(1) precision water level gauge (2 sets)
(2) AC submersible pump (2)
(3) collection control box (1 sets)
(4) logging: glass fiber reinforced plastic (or stainless steel) logging, size of 360mm*1000mm
(5) upper computer communication interface and software (purchase)