DN25-DN1000 Crossed Diameter Handheld Digital Ultrasonic Water Flow
Meter Product profileThe ultrasonic flow meter has been
upgraded based on the previous ultrasonic flowmeter which is still
the main product line of the company. The new Version retains most
of the excellent features and functions of the previous versions:
the pulse measurement technology, the ultrasonic igniting and the
small signal receiving circuits etc. The main improvements are made
on the battery supply circuit and on the transmitting circuits. All
other circuits are simply integrated into this new version without
major modifications, due to the fact that we have already applied
the most advanced measurement technologies and attained a more
reliable model of ultrasonic flow meter. Features*
Large-screen LCD
* Non-contacting measuring* Built-in
data-logger
* Built-in rechargeable battery* High accuracy measuring
* Wide measuring range* Small and light
* RS-232 serial interface
Principle of measurement The Handheld Ultrasonic
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 where the
sound transverses the pipe twice, or W-method where the sound
transverses the pipe four times, or in Z-method where the
transducers are mounted on opposite sides of the pipe and the sound
crosses the pipe once. This selection of the mounting method
depends on pipe and liquid characteristics. The flow meter
operates by alternately transmitting and receiving a frequency
modulated burst of sound energy between the two transducers and
measuring the transit time that it takes for sound to travel
between the two transducers. The difference in the transit
time measured is directly and exactly related to the velocity of
the liquid in the pipe, show as follows: Whereθ is the include
angle to the flow directionM is the travel times of the ultrasonic
beamD is the pipe diameterTup is the time for the beam from
upstream transducer to the downstream one Tdown is the time
for the beam from downstream transducer to the upstream
one ΔT=Tup -Tdown Specifications for DN25-DN1000 Crossed
Diameter Handheld Digital Ultrasonic Water Flow
Meter Linearity0.5%Repeatability0.2%Accuracy±1% of reading at
rates>0.2 mpsResponse Time0-999 seconds,
user-configurableVelocity±32 m/sPipe
Size15mm-6000mmTotalizer7-digit totals for net, positive and
negative flow respectivelyLiquid TypesVirtually all
liquidsSecuritySetup values Modification Lockout. Access code needs
unlockingDisplay4x8 Chinese characters or 4x16 English
lettersCommunication InterfaceRS-232, baud-rate: from 75 to 57600.
Protocol made by the manufacturer and compatible with that of the
FUJI ultrasonic flow meter. User protocols can be made on
enquiry.Transducer Cord LengthStandard 5m x 2, optional 10m x
2Power Supply3 AAA built-in Ni-H batteries. When fully recharged it
will last over 12 hours of operation.100V-240VAC for the
chargerData LoggerBuilt-in data logger can store over 2000 lines of
dataManual Totalizer7-digit press-key-to-go totalizer for
calibrationHousing MaterialABSCase Size210x90x30mmHandset
Weight500g with
batteriesApplication: Outstanding
Features: ----the signal receiving circuits feature
self-adapting performance so as to ensure that the user can easily
operate the instrument without any adjustment.
----the built-in rechargeable Ni-H battery can work
continuously for more than 12 hours without
recharging. /* January 22, 2024 19:08:37
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