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DMTFW
ULTRASONIC WATER METER |
Series DMTFW ultrasonic water meters utilizes newest digital transit-time processing technology, with compact shape featuring longevity, good stability and high accuracy for all-electronic industrial environment. The meters contain no moving parts and don't need any external power, with the character of low power consumption. The meters are designed for easy installation. Even users don't need to set parameters. The meters have the same dimensions with industrial water meter but can be used just as conveniently as normal water meters. |
Principle of Operation
Dynameters ultrasonic water meter utilizes two sensors T1 & T2 and they are mounted inside the pipe. Suggest the sound is transmitting form T1 and the time interval to reach T2 is t1 and from T2 to T1 is t2. When the liquid is flowing the t1 and t2 will have a slight time difference. After the time difference has been measured, we can use the following formula to calculate the velocity.
V=D¡Á(t1-t2)/[t1¡Át2¡ÁSIN(2¦È)]
D is the inner diameter of the pipe; B is the angle of the T1-T2 and the pipe axis.
Velocity multiply the pipe section area is the flow rate.
Since B is fixed, the velocity is only related to t1 and t2 and has nothing to do with the fluid.
Fig. 1 Principle of Operation |
Features£º
1. With compact, solid shape, suitable for bad environment conditions.
2. No moving parts, no pressure loss or abrasion.
3. Low start-up flow rate, minimum measurable flow velocity 0.003m/s, long-term stability.
4. Self-adapting ultrasonic receiving circuit, can work normally and stably even when pipe is with scaling or corrosion.
5. Quick transient response, can trace the flow rate change within seconds (superior to electromagnetic flow meters).
6. With Infrared meter reading function.
7. Battery power supply, can work constantly for 6 years.
8. Unique housing design, can work underwater.
9. Flange is made by mold to remove possibility of leakage.
10. With self-diagnosing function and fault indicator. |
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Technical Characteristics |
Low power consumption, digital process technology with stable and permanent PiezoSeal TM sensor. |
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Accuracy |
Class 1 according OIML [Q3¡Ý100m3/h, accuracy is ¡À1.0% when Q2¡ÜQ¡ÜQ3; accuracy is ¡À3.0% when Q1¡ÜQ£¼Q2] |
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Display |
Low power consume LCD display, can display:
1) total flow, flow rate, velocity, working time and date
2) signal intensity, quality and battery status |
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Connection and output |
1) RS232 can work without extra power supply.
2)RS485 out put, with extra 5V power supply
3)4-20mA out put with extra power supply
4)ModBUS available
5)GRPS available
6) OCT out put for total flow |
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Operation |
Magnetic keypad with REED inside and inside keypad available |
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Sampling period |
Every 3 seconds as standard, can be adjust from one second to every 31 seconds. |
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Fluid |
Water or other liquids of -30¡æ~160¡æ |
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Environment temperate |
Environmental temperature: -40¡æ~80¡æ
LCD: -25¡æ~60¡æ |
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Other functions |
1) Automatic circle display of commonly used value can be programmed.
2) Fault self-diagnosis detection, fault indicator.
3) Six measuring unit optional for total flow: 1 m3, 0.1 m3, 0.01 m3, 0.001 m3, 0.0001 m3, 0.00001 m3, 0.000001m3 .
4) Baudrate: 300, 1200, 2400, 4800, 9600, parity available
5) Store data of total flow, velocity of last 24 months
6) 8 digits negative/positive totalizer, inside 64 digit calculating
7) Data storing when power off
8) Other programmable functions |
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Power Supply |
1)3.6V lithium battery. Can work with 2.6V.
2) RS232 output needs no extra battery.
3) 4-20mA powered by current loop, no extra battery needed
4) 5V power needed when use RS485 out put, current less than 5mA. |
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consumption |
1)For recording data every 3s for pipe DN100mm, the consumption is 0.33mW
2) For recording data every one second for pipe DN100mm, the consumption is 1.65mW
3) Water meter will enter into energy saving mode when the pipe is empty, consumption is only 30% as normal working. |
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Enclosure class |
IP67, IP68 for sensors, can work under water |
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Pipe size |
Suitable for pipe size DN32-200mm |
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Flanges |
DIN, ANSI, JIS available;;DN40, DN32, NFT thread |
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Model Selection Table of DMTFW
MODEL DMTFW - X - X - X -X -X -X
Diameter DN
050-DN50
Pipe material
1-Carbon steel
2-Stainless steel
Pressure
A-1.0Mpa
B-1.6Mpa ( If you need other pressure, pls inform factory)
Output
N-None
1-4-20mA
2-OCT Pulse
3-RS232
4-RS485
5-ModBus
6-M-Bus
7-GPRS wireless modem
Flanges
1- DIN (EN1092-1)
2- ANSI B16.5
3- JIS ( If you need other standard, pls inform factory)
Display
A- Compact version
B- Seperate version
Example: DMTFW-100-1-A -1-1-A
Dynameters DMTFW ultrasonic flow meter; pipe diameter 100mm; carbon steel; 1.0Mpa; 4-20mA out put; flanges according to DIN, compact version. |
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Features
1. High measurements precision
2. Long-term stability over a wide range of measured values
3. High operational reliability and minimum maintenance requirements (maintenance-free meters)
4. Compared to mechanical meters, very low hydraulic losses
5. Easy data reading, storage and evaluation/processing
6. Identification of leaks in water distribution systems
7. Installation at locations here no external power sources are available
8. Measured data transfer to remote control stations
Benefits
1. Process control and instrumentation.
2. Substituting mechanical flow meters with high measuring reliability.
3. Technological measurements of instantaneous flow rate and consumption in water-supply networks.
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DMTFW brochure.pdf
Data Logger System.rar