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DMTFP
PORTABLE TRANSIT-TIME ULTRASONIC FLOWMETER

Four lines 16 alphabetical LCD display
Suitable for liquids of high temperature of -40~250 deg C
Providing Hart Protocol and ModBus Protocol outputs
Transmitter can be integratively explosion-proof
Patented K mode round transducers for small pipe

Series DMTFP Portable Transit Time Flow Meters are a state-of-the-art universal transit-time flow meter designed using Multibeam technology and low-voltage broadband pulse transmission, feature the worlds advanced non-invasive flow measurement technology providing a measuring system with unsurpassed accuracy, versatility, ease of installation and dependability. Although designed primarily for cleaner liquids, the flow meter can reliably measure liquids containing moderate amounts of suspended solids or aeration. DMTFP is designed for long- or short-term flow measurement surveys on full-pipe liquid systems and is ideal for verifying calibration of permanently mounted flow meters of all types.
The flow meter features a tactile keypad, 40-hour battery (rechargeable), back-lit graphics display C all integrated into a rugged, watertight enclosure.
The cost-effective and versatile DMTFP flow meter comes complete with all accessories necessary for measuring piping systems from 1' [25 mm] to 180'.
Pricinple of Operation:
 
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(¡÷t). When the flow is still, the time difference(¡÷t) 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.
    
V= K*D* dt            
  Where:  V: Liquid velocity
  K: Constant
  D: Distance between the two transducers
  dt: difference in time of flight
Features:
- Cost effective and versatile.
- High accuracy, better than 1.0% read.
- Portable main unit, Compact enclosure. Portable case for all
    accessories.
- Wide flow measurement range, from 0.03 to 40 ft/s
    (0.01m/s ~12 m/s).
- Velocity, volumetric and totalized flow display.
- Bi-directional. Totalizer for net, positive and negative flow display.
- Wide pipe size range , from 1/ 2' to 180' (DN12~4570mm).
- Suitable for all commonly used pipe materials.
- Rechargeable battery for 40 hours of operation.
- Self-explanatory user interface, easy to operate.
- Signal quality tracking and self-adjusting capabilities automatically match     transducer to pipe material.
- Options:( Data Logger: 512M (200,000 event), 16-bit integral DB-9 RS232C Connection can be removed and installed without disconnecting system power.)
- Options:(Hart&ModBus Protocol Module.)
- Ideal for both clean and opaque liquid flow, in fact, most any
    liquid containing less than 5% total suspended solids (TSS) or aeration.
- Clear, user-friendly menu selections make DMTFP simple and
    convenient to use.
Transmitter
Power Supply
Internal 7.2AH Charging battery,
Provides 42 hrs. Of continuous operation @ 20 ¡ãC.
Charging power: 220VAC¡À15%. Solar energy
Velocity
0 ~¡À 40 ft/s (0 ~ ¡À12m/s), bi-directional
Display
4 line¡Á16 English letters LCD back lit, can display total flow, flow rate, velocity and meter run status etc. 
Units
Rate
Totalized
User Configured (English and Metric);
Rate and Velocity Display;
(FWD, NET, REV or BATCH) gallons, ft³, barrels, lbs, litters, m³,kg
Output
4~20mA, Pulse, Relay, RS232C or RS485, options: up to 8 GB Data logger, Hart +(4~20mA), Modbus
Accuracy
¡À1.0% of reading at rates >0.5 m/s);
¡À0.003 m/s of reading at rates<0.5 m/s
Sensitivity
Flow Rate: 0.001f/s (0.0003m/s)
Repeatability
0.2% of reading
Security
Keypad lockout, access code enable
Transducer
Liquid Types Supported
Virtually most any liquid containing less than 2% total suspended solids (TSS) or aeration
Suited Liquid Temperature
Std. Temp. Transducer: -40¡æ~121¡æ
High Temp. Transducer: -40¡æ~250¡æ
Cable Length
Std: 20 feet (6m); Opt: Maximum: 990 feet (300m)
Pipe Size
Std M transducer: 40 to 1000mm
L transducer: 1000-4570mm
S transducer: 12-50mm
K-mode round transducer: 12-50mm
Transducer Size
S: Size:42*25*25; weight:<0.3kg
M: Size:60*43*43; weight:<0.6kg
L: Size:80*53*53; weight:<1.0kg
Accessories
Couplant
Dow Corning 111 or 732 (112 for high temp.)
Elastic Belts
2 bundles
Battery Charge
1 pcs
Data Logger
Optional 512M to 8GB SD card
Software
Windows-based Software Utility, data logging, data report, and data curve and analyze.
Model selection:
   
         
 
 
 
 
 
Model
DMTFP
-
X
X
X
X
/
*£¨Transducers£©  
Portable Series
 
 
 
Output
 
N¡ªN/A 
 
1¡ª4-20mA
 
2¡ªOCT Pulse Output£¨Flow rate or Total output£©
 
3¡ªRS232
 
4¡ªSD card Data Logger and software
 
Output Selection 1
 
 Same as above 
 
Output Selection 2
 
Same as above
 
Power Supply(Charger connector types)
A-150 VAC(two round terminals)
B-230 VAC(two round terminals)
C-100 VAC(Standard two rectangular terminals and one round terminal)
D-230 VAC (Standard two rectangular terminals and one round terminal)
 
 
 
 
Transducers:
 
 Model       
 
DP  -
X
 X
X
 
Transducer Type
 
S¡ªSmall(12-40mm)                       
 
M¡ªMiddle(25-1250mm)  
 
L¡ªLarge(1000-4570mm)
 
K¡ªSmall-Pipe Clamping-on Transducers(12-50mm)
 
Transducers Temperature
 
N¡ª-40¡«121¡æ
 
H¡ª-40¡«250¡æ£¨Exclusive the High-Temperature Series£©
 
 Cable Length
 
S -- 4 meters Flexible cable
 
L -- 8 meters Flexible cable
 
K mode transucers, user must select a pipe line, for example, K20, means DN20 for K mode transducer for DN20, K50 for DN50.        
 
Example:
DMTFP-24NN/DP-MNL, means portable ultrasonic flow meter with OCT output, data Logger, DP M transducer, normal temp., 8 meters flexible cable.
The DMTFP flowmeter is ideal for flow surveys and closed Cpipe 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.
Applicable liquids:
- 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.