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DMTFH
HANDHELD TRANSIT-TIME ULTRASONIC FLOWMETER |
Four lines 16 alphabetical LCD display
Small, Light-weighted, mobile measurement
Suitable for liquids of high temperature of -40~250 deg C
The DMTFH Handheld Clamp-on Ultrasonic Flowmeter is one of the most powerful flowmeters available for liquid measurement .The utilization of our proprietary ultrasonic signal processing, transit-time measurement and signal quality tracking technologies allows the flowmeter to measure liquid flow rate from outside of a pipe reliably and accurately.
The DMTFH flowmeter is carefully designed so that it is very compact and easy to use. A user can use hand to hold as well as to operate the flowmeter main unit .The user-interface is self-explanatory and very easy to follow. Besides, the unique clamp-on fixture design makes the installation very simple and no special skills or tools required .Due to the non-intrusive nature of the clamp-on technique ,there is no pressure drop ,no moving parts, no leaks and no contamination. |
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DMTF transit time flow meter utilizes two transducers that function as both ultrasonic transmitters and receivers. The transducers are clamped on the outside of a closed pipe at a specific distance from each other. The transducers can be mounted in V-method in which case the ultra sound transverses the pipe twice, or W-method in which case the ultra sound transverses the pipe four times, or in Z-method in which case the transducers are mounted on opposite sides of the pipe and the ultra sound transverses the pipe only once. The selection of mounting method depends on pipe and liquid characteristics. When the flow meter works, the two transducers transmits and receives ultrasonic signal amplified by multibeam that travels firstly downstream and then upstream (Figure 1). Because ultra sound travels faster downstream than upstream, there will be a difference of time of flight(¡÷£ô). When the flow is still, the time difference(¡÷£ô) is zero. Therefore, as long as we know the time of flight both downstream and upstream, we can work out the time difference, and then the flow velocity (V) and flow volume (Q) via the following formula.
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V= K*D* dt
Where: V: Liquid velocity
K: Constant
D: Distance between the two transducers
dt: difference in time of flight | |
Features:1. Carefully designed so that is very compact and ease to use.
2. Principle of Transit Time and MultibeamTM Technology.
3. Can be used for mobile measurement, flow rate calibration, data comparing, meters running status checking.4. A variety of liquid applications can be accommodated: ultra-pure liquids, potable water, chemicals, raw sewage, reclaimed water, cooling water, river water, plant effluent, etc. 5. Data Logger functions. The capacity is based on users£§choice, and the maximum can reach 8GB. Users can store 5 years' data in it at least and user can read, edit and export the data for reference and analysis. |
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Transmitter |
Power Supply |
3 AAA Ni-H built-in batteries. When fully recharged it will last over 12 hours of operation. 100V-240VAC for the charger |
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Velocity |
0 ~ ¡À40 ft/s (0 ~¡À12m/s), bi-directional |
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Display |
4 line¡Á16 English letters LCD back lit, can display total flow, flow rate, velocity and meter running status etc. |
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Units
Rate
Totalized |
User Configured (English and Metric);
Rate and Velocity Display;
(FWD, NET, REV or BATCH) gallons, ft³, barrels, lbs, litters, m³,kg |
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Output |
4~20mA, Pulse, Relay, RS232C or RS485, options: up to 8 GB Data logger, Hart +(4~20mA), Modbus |
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Accuracy |
¡À1.0% of reading at rates >0.5 m/s |
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¡À0.005 m/s of reading at rates<0.5 m/s |
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Sensitivity |
Flow Rate: 0.001ft/s (0.0003m/s) |
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Repeatability |
0.2% of reading |
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Security |
Keypad lockout, access code enable |
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Dimensions and Weight |
100*204*34 Weight: <0.6kg |
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Transducer |
Liquid Types Supported |
Virtually most any liquid containing less than 2% total suspended solids (TSS) or aeration |
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Suited Liquid Temperature |
Std. Temp. Transducer: -40¡æ~121¡æ
High Temp. Transducer : -40¡æ~250¡æ |
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Dimensions and Weight |
S: Size:42*25*25; weight:<0.3kg
M: Size:60*43*43; weight:<0.6kg
L: Size:80*53*53; weight:<1.0kg |
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Pipe Size |
Std M transducer: 40-1000mm
L transducer: 1000-4570mm
S transducer: 12-50mm |
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Accessories |
Portable Case |
Size: 445*290*130; Weight: <3.5kg |
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Couplant |
Dow Corning 111 or 732 (112 for high temp.) |
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Elastic Belts |
2 bundles |
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Battery Charger |
1 pcs |
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Data Logger
Software |
Optional 512M to 8GB SD card
Windows-based Software Utility, data logging, data report, and data curve and analyze. | |
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Model |
DMTFH |
¨C X |
X |
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X |
/ *£¨Transducers£© |
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Handheld Series |
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Output Selection 1 |
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N¡ªN/A |
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1¡ªOCT Pulse (Flow Rate or Totalizer Output£© |
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2¡ªRS232 |
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3¡ªData Logger & Software |
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Output Selection 2 |
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Same as Output Selection 1 |
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Power Supply (Charger connector types)
A-115 VAC(two round terminals)
B-230 VAC(two round terminals)
C-100 VAC(two rectangular terminals)
D-230 VAC(two rectangular terminals) |
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Model |
D¨CH |
¨C X |
X |
X |
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Transducer Type |
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S¡ªSmall(12-50mm) |
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M¡ªMiddle(40-1000mm) |
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L¡ªLarge(1000-4570mm) |
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Transducers Temperature |
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N¡ª-40¡«121¡æ |
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H¡ª-40¡«250¡æ£¨Exclusive S, L transducer type£© |
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Cable Length |
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S1 -- 4m Flexible cable S2 -- 5m non-Flexible cable
L1 -- 8m Flexible cable L2 -- 10m non-Flexible cable |
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Parts Number Construction example:
For example£ºDMTFH-1N-N/DH-MNS1
Note: DMTFH Handheld ultrasonic flow meter, OCT pulse output, Non-multiple output selections; welded directly for the pipe of transducers, standard M type transducer, standard temperature,4 meters Flexible cable. |
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The DMTFH flowmeter is ideal for flow surveys and closed pipe applications where non-invasive measurement of liquids is required .Benefited from our advanced digital signal processing technology, the handhold flowmeter works reliably in both clean and opaque liquid flow.
Applications:
- Water, including hot water, chilled water, city water, sea water, etc.
- Sewage and drainage water with small particle quantity.
- Oil, including crude oil, lubricating oil, diesel oil ,fuel oil, etc.
- Chemicals, including alcohol, acids, etc.
- Solvents.
- Beverage and food processors.
- HVAC hot and cool water, water /glycol solutions.
- Water and waste treatment.
- Power plants (nuclear power plants, thermal & hydropower plants), heat energy boiler feed water.
- Energy consumption supervision and water conservation management.
- Metallurgy and miming applications (e.g., acid recovery).
- Marine operation and maintenance.
- Pulp and paper.
- Pipeline leak detection, inspection, tracking and collection.
- Energy measurement and balancing.
- Network monitoring. |
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Series DMTFH Handheld Brochure.pdf
Data Logger System.rar