Ultrasonic flowmeter Introduction: HNVF-1100 ultrasonic flowmeter with the weir tank equipped with, mainly used to measure sewage flow channel having a free-flow conditions inside. Hahn fluid research and production of ultrasonic flowmeter Germany to introduce the most advanced signal processing technology, the stability of the measurement greatly improve the measurement accuracy of 0.1%, simple installation, commissioning and easy maintenance. Applicable to sewage treatment plants, channel alteration, river training, generous farmland irrigation, water conservancy and hydropower flow measurement.
HNVF-1100 ultrasonic flowmeter
First, the product features, purpose and scope
1.1 Features
- Digital signal processing technology, suitable for harsh environment applications
- Advanced signal environment and convenient display (oscilloscope technology), debugging, easy to install
- High-speed and reliable single-chip processing, fast and stable
- Multiple data filtering technology, stable and reliable measurement
--16 High-accuracy D / A output, improve the accuracy 4-20mA output
- With a 485, you can access a computer or other data acquisition
- The hour, day, month, year and power flow information data storage capabilities
1.2 Purpose
The instrument is equipped with a weir tank, which was primarily used to measure sewage flow channel having a free-flow conditions inside. Applicable to sewage treatment plants, channel alteration, river training, agricultural irrigation and other generous flow measurement
1.3 Scope
- Flow range: 0 liters / sec to 10 m / sec (the kind used with the weir tank, specifications determined)
- Working temperature: -20 ~ 55 ℃
Second, the instrument works
Flow measurement principle 2.1 weir tank
Open channel flow, the higher level; the smaller the flow, the lower level. Correspondence between the upstream water level and flow channels depends on the geometry of the weir tank. The same amount of water weir trough on different channels, the same level corresponding to the same traffic. Weir tank turned into the traffic level. By measuring the amount of water flowing through the weir tank water level, according to the level corresponding to the amount of water weir trough - flow relationship obtains traffic.
2.2 Ultrasonic level measurement principle
This instrument uses ultrasonic echo ranging method to measure the liquid level. Probe is fixedly mounted above the weir trough level observation point. Alignment of the probe surface. Probe to the surface emitting ultrasonic waves. Ultrasonic after t time, reach the surface. This part of the surface energy is reflected is received by the probe. Instrumentation note of this length of time t. Temperature sensor mounted inside the probe, and the temperature signal to the meter. Instrumentation calculate the current temperature probe, according to the ultrasonic wave propagation velocity and the elapsed time t, temperature-compensated out of the water to calculate the distance D probe
2.3 meter measuring principle
Instrumentation control probe for transmitting and receiving ultrasonic waves. Measured level (unit: m). And then stored by checking the water level in the meters - the flow meter, through correspondence data comparison, and finally turn into a liquid flow rate is displayed (unit: cubic meters / hour).
Water - flow meter is a set of data stored in the instrument. The water level meter - flow meter is based on an equal level intervals stored. For example, when you use a triangular weir, level interval is set to "0.01m". Instrument memory there: level = "0.00m" when the corresponding flow rate = "0.0000L / S"; Level = "0.01m" when the corresponding flow rate = "0.0136L / S"; Level = "0.02 m "when the corresponding flow rate =" 0.0772 L / S "; level =" 0.03m "when the corresponding flow rate =" 0.2127L / S "....... Some common level - flow meter is pre-set in the meter. Select the corresponding weir trough species using the parameter table you can get the appropriate level - flow meter.
Third, the instrument composition and classification
3.1, the instrument composition
The instrument consists of instruments, the probe parts. Instrument and probe connector cable, model: RVVP4-0.3 (four-core + screen, an outer diameter less than 6mm). Instrument Factory Original 10 meters, the application can take a long to 200 meters. For more than 200 meters, it should be declared when ordering.
Category 3.2, weir tank
Ultrasonic open channel ultrasonic flowmeter weir tank are the following: Right-angle triangle weir, rectangular weirs and Parshall slot
Fourth, the major technical indicators and technical parameters
4.1 Flow range: 0 l / s ~ 10m3 / sec (the kind used with the weir tank, specifications determined)
4.2 Accumulated flow: 12 decimal digits, automatically returns to zero after full tired
4.3 Flow accuracy: 1%
4.4 Working range: 3 m
4.5 Accuracy: 0.2%
4.6 differentiate Level: 1 mm
4.7 Working temperature: -20 ~ 55 ℃
4.8 Instrument Protection class: Instrument display section: IP65; part of the probe: IP65
4.9 Power Supply: AC power supply 220V ± 10% 6W
4.10 meter calendar clock timing error: <2s / 24h>
4.11 meter data storage: Store traffic record 128 hours, 64 daily flow, monthly traffic 32, the annual flow 4, record 64 power. Memory recycling, overwrites the oldest record is full
4.12 4 ~ 20mA current output:
External load resistance: 0 ~ 500Ω
Error: 0.1% (relative value indicating instrument), the negative terminal and a ground terminal connected in common meter (depending on the application requirements can be changed to suspended output)
Output: instantaneous flow
4.13 RS485:
Encoding: 1 start bit, 8 data bits, 1 stop bit
Baud rate: 9600
0-09, when set to 00 each output will be measured once again
When the address is 01-09, the required command to query:
Send format:! x (x address)
Loopback format: # 000000000 0000.000; a first set of data is accumulated flow (cubic meters) a second set of data is instantaneous flow rate (m³ / h), separated by a space character between the two data
4.14 Relay:
Control: For every set is closed once m3 (50 ms), high alarm level
Type: single-pole double-throw (normally open, normally closed)
Contact capacity: AC250V 1A; DC30V 1A
If unknown: please contact customer service
