FFZ-01P digital platform system equipment for water surface evaporation observation
1. introduction:
The platform system of water surface evaporation type FZ-01P digital observation (hereinafter referred to as the "digital platform system" or "system") is a kind of suitable for both 20m2, 5m2 and 1m2 used as evaporation ponds, water evaporation equipment, complete system of automatic observation includes: water evaporation type FFZ-01 digital meter, JFZ-01 digital gauge, NC, NC overflow a water supply tank, acquisition control box, matching circuit, computer system and other water facilities.
The digital observation platform technical performance parameters all reached the People''s Republic of China Ministry of water conservancy and electric power "evaporation observation standards" SD265-88 and Chinese Meteorological Bureau in 2003 edition of "meteorological observation standard" requirements, the resolution, the measuring accuracy of the highest degree of automation, the highest evaporation digital observation platform.
2. system composition, working principle
The working principle of the system: the water evaporation observation system based on digital platform, atmometer ombrometer, overflow bucket for basic observation instruments, the collector automatic acquisition, processing and display of evaporation and precipitation, the overflow process information, automatic control of evaporation pool, overflow well fill and drainage process. The collector through the RS485/232 communication interface with the host computer system, data communication machine (RTU) connection, remote monitoring can be achieved by the water evaporation process information by using the application software system supporting the data processing and storage.
The water level of the evaporation pool should be kept on the water mark line in the digital platform system for water surface evaporation observation. In the absence of precipitation day, the collector automatically collects the change of water surface height in the evaporation tank, and calculates the evaporation amount. When the height of the water evaporation ponds to the agreed value (water mark line 10mm), collector in the observation on the boundary (boundary for 8:00 moment hydrological, meteorological demarcation for 20:00) B3 to control water pump, automatic water evaporation pool, the pool water level recovery to the water mark line height, then, to as the height of water after the measuring points, measuring evaporation of the next time.
In rainy days, when the water level rises to the agreed value of evaporation pool (water mark line above 10 mm), B1 drive pump overflow collector, the evaporation tank flows into the overflow, overflow when the water level reached the agreed value when the overflow end of the process, calculation of flow data acquisition after the start of the overflow drain pump B2, the overflow buckets of water discharged to the prescribed height of bottom water.
According to the "water surface evaporation observation standard" and the "surface meteorological observation specification" stipulated by the State Meteorological Administration, the calculation formula of evaporation amount is as follows:
Evaporation amount = (evaporation water level measurement value of evaporation pool water level initial value) + precipitation overflow flow
The upper form can be simplified as:
QF = (Wt-W0) +Qj-Qy
Formula: QF: represents evaporation of water surface, unit: mm
Wt: the evaporation pool water level indicating the measurement time (T), unit: mm
W0: the evaporation pool water level at the initial moment. Unit: mm
The Wt and W0 values are automatically measured by FFZ-01 digital water surface evaporation meter.
Qj said: the precipitation period is measured, the Qj value from the JFZ-01 digital gauge, unit: mm
Qy: to indicate the overflow in the tested period, and the Qy value is automatically measured by the numerical control overflow well. Unit: mm
3 main performance parameters:
3.1 water level variation of evaporation pool:
The water level standard line is base: 20mm
3.2 resolution:
Resolution of A. evaporation measurement: 0.1mm
B. precipitation resolution: 0.1mm
C. flow measurement resolution: 0.01mm
3.3 measurement accuracy:
System measurement error (F a.) without precipitation:
Delta F= delta f
In 8 F said the measurement error of digital atmometer, less than 3% of F.
B. has no overflow when precipitation occurs:
Delta F= delta f + delta J
In the delta J as the measuring error of JFZ-01 type digital gauge
8 J less than 0.2mm (precipitation is less than 10mm, when)
Delta j + 0.2mm + 1%*FS (precipitation is not less than 10mm)
C. has precipitation and produces overflow:
Delta F=, F + L, j
In the delta f less than 0.02mm*N where N is the number of overflow drain
The 3.4 collector clock accuracy: 4 minutes / month
3.5 PC function:
Data table form:
(1) water surface evaporation, precipitation, overflow information display (monthly report, annual report)
(2) the curve of water surface evaporation, precipitation and overflow discharge (monthly curve and annual curve)
(3) histogram of water surface evaporation, precipitation and overflow discharge (monthly histogram and annual histogram)
(4) histogram of water surface evaporation, precipitation and overflow discharge (monthly histogram and annual histogram)
(5) alarm information: equipment status (leakage) alarm, power supply voltage alarm
4. equipment installation (omitted)
4.1 infrastructure
4.2 installation of instrument and equipment
The use and maintenance of 5. system equipment
5.1 commissioning and inspection before operation
5.2 trial run record
5.3 use and maintenance
6. troubleshooting