WL-1A1 Ultrasonic Open Channel Flow Meter

Product Features

Non contact measurement: The sensor does not come into contact with the fluid and is not corroded or contaminated by sewage. The sensor has an ABS shell fully sealed structure, which is resistant to alkali, corrosion, and can operate for a long time in humid environments.

◇ Direct measurement of flowing water surface: The sensor directly measures the liquid level of the flowing water surface without using a static water well, which can prevent the blockage of the connecting pipe caused by suspended solids, sediment, etc. in the sewage from using a static water well, resulting in inconsistent water levels between the static water well and the measuring weir tank, or false liquid levels due to winter icing, leading to flow measurement errors.

◇ Wide adaptability: The instrument parameters can be set through the keyboard and can be used with various measuring weirs and tanks. To adapt to different application conditions such as surface open channels and underground culverts.

Complete technical support: Random files provide installation methods for instruments, parameter setting methods, construction and installation methods for measuring weirs, flow error calibration methods, etc.

◇ Reliable quality: This product has been produced, operated, and improved for nearly 20 years, and on-site use has proven that its performance meets the requirements for sewage metering.

Main technical indicators and parameters

1. Flow range: 10 liters per second to 10 cubic meters per second (determined by the type and specifications of the measuring weir used)

2. Accumulated traffic: 8-bit decimal number, automatically returns to zero after accumulating 8 digits, recalculated

3. Flow accuracy: ± 5% (with an uncertainty of 1-3% in the use of measuring weirs, plus an additional 1-2% instrument measurement error)

4. Ranging range: 0.4-2 meters (within 0.4 meters from the bottom of the probe is a blind spot, and within 0.4-2 meters is the ranging range)

5. Distance measurement accuracy: ± 3mm (calibrated within a 1-meter range)

6. Liquid level resolution: 1mm

7. Working environment temperature: -20~55 ℃ (AC power supply, and additional self tracing in the instrument can be: -35~55 ℃, additional self tracing should be declared at the time of ordering)

8. Instrument protection level: Instrument display part: IP66 (the wire hole at the bottom of the instrument should be blocked); Probe part: IP68

9. Power supply:

AC power supply: 220V ± 10% 6W (26W when using instrument self tracing)

DC power supply: 12V ± 2V 120mA (when powered by DC, the instrument does not have 4-20mA output and relay action). When both AC and DC power supplies are present, the instrument uses AC power supply; AC power failure automatically connects to DC.

10. Instrument calendar clock timing error:<5 minutes/month

11. Instrument data storage capacity:

Monthly, daily, and hourly records: only record traffic for more than 2 years, with additional instruments for 4 channels for more than 4 months

Record per minute: only record flow>8 hours, additional instruments 4 channels>4 hours

12. 4-20mA current connected to other instruments:

Internal sampling resistance of the instrument: 200 Ω; Negative terminal and instrument ground terminal are connected together

Number of accessible channels: I1, I2, I3, I4, totaling 4 channels

13. Compatible printers: interface socket, DB25 jack

When set to "print records": EPSON compatible (recommended to use TP - μ p40T)

When set to "timed printing": only TP - μ p40T (requires the Chinese character library in the printer)

14. 4-20mA current output:

External load resistance: 0-500 Ω

Error: 0.5% (relative to instrument reading)

The negative terminal is connected to the instrument ground terminal (can be changed to suspended ground output according to application requirements)

Output content: optional flow rate and liquid level

15. RS232: interface socket, DB9 pin

Encoding method: 1 start bit, 8 data bits, 1 stop bit, with parity or no parity bit

Baud rate: 30060012002400480096001440019200288004320057600 optional

Communication protocols: Yiwen, Jinyuan, Xijiao, Jiubo, etc. (see Chapter 10, Section 10 "Remote Communication")

16. Relay:

Control mode: Close once per cumulative set m3, liquid level alarm, liquid level upper limit, liquid level lower limit optional

Type: Single blade double throw (normally open, normally closed)

Contact capacity: AC250V1A; DC30V1A