1.1 Introduction
The handheld ultrasonic flow meter has been upgraded on the basis of the previous version, and the new version retains most of the excellent features and functions of the previous version: pulse measurement technology, ultrasonic ignition and small signal receiving circuit, etc. Major improvements have been made to the battery-powered circuit and the transmitter circuit. Since we have applied state-of-the-art measurement techniques and obtained a more reliable model of the ultrasonic flowmeter, all other circuits are simply integrated into this new version without major modifications.
The SUP-2100H series handheld flow meter incorporates the latest ICs manufactured by famous semiconductor manufacturers like Philips, Maxim, TI, win bond, and Xilinx. The hardware features ease of operation, high accuracy, and outstanding reliability, while the software provides a very user-friendly interface and much more functions. It employs a patent balanced lower voltage multi-pulse igniting circuit which increases the anti-interference ability magnificently so that the flow meter will work properly even in demanding industrial environments such as those with a power frequency transverter working nearby.
Other 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 recharge.
The advanced circuit design, the integration of the latest semiconductors, the user-friendly software interface both in English and Chinese languages, and the small-sized PCB board, all these features combine to make the SUP-2100H series handheld ultrasonic flow meter the best and the biggest seller on the market.
Moreover, it is gaining more and more recognition in the international flow meter market.1.2 Features
- 0.5% of linearity
- Bilingual interface in Chinese and English
- Patent-balanced lower-voltage multi-pulse
- Ultrasonic igniting
- Built-in date totalizers
- 0.5 second totalizing period
- 100 Pico-second resolution of time measurement
- 0.2% of repeatability
- 4 flow totalizers
- Built-in data logger
- Good anti-interference
1.3 Principle of Measurement
The SUP-2100H handheld ultrasonic flow meter is designed to measure the fluid velocity of liquid within a closed conduit. The transducers are a non-contacting, clamp-on type, which will provide the benefits of non-fouling operation and easy installation.
The SUP-2100H 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 where the sound transverses the pipe twice, or w-method where the sound transverses the pipe four times, or in the 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, as shown in Figure l.
θ is the included angle to the flow direction
M is the travel time of the ultrasonic beam
D is the pipe diameter
Tup is the time for the beam from the upstream transducer to the downstream one Town is the time for the beam from the downstream transducer to the upstream one
ΔT=Tup -Tdown
1.4 Parts Identification
Converter:
1.5 Typical Applications
The SUP-2100H handheld flow meter can be virtually applied to a wide range of measurements. The measured pipe ranges 20-6000 mm [0.5-200 inch]. 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. Because the instrument and transducers are non-contacting and have no moving parts, the flow meter can not be affected by system pressure, fouling, or wear. standard transducers are rated to 110℃. Higher temperatures can be accommodated. For further information, please consult the manufacturer for assistance.
1.6 Data integrity and Built.in Time.Keeper
All user-inputted configuration values are retained in the built-in non-volatile flash memory that can store them for over 100 years, even if power is lost or turned off. Password protection is provided to avoid inadvertent configuration changes or totalizer resets.
A time-keeper is integrated into the flow meter for the index of date totalizing and works as the time base of flow accumulation. It keeps operating as long as the battery's terminal voltage is over 1.5V. In case of battery failure, the time-keeper will not keep running and it will lose proper time values.
The user must re-enter proper time values in case the battery becomes totally exhausted. An improper time value affects no other functions but the date totalizer.