Melan Measurement & Control Instruments (Shanghai) Co.,Ltd.
MELAN MEASUREMENT & CONTROL INSTRUMENTS (SHANGHAI) CO., LTD.
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Ultrasonic Clamp On Flow Meter for Liquids
I. INTRODUCTION
The energy consumed by the user is calculated by measuring the temperature and flow rate of the chilled water (or hot water) flowing through the pipe.Install an energy meter ML-E8 on the user's inlet pipe and install a temperature sensor on each of the inlet and outlet pipes. The energy is calculated by metering the amount of chilled water (or hot water) flowing through the pipe (ie, the flow rate and pipe size), and the temperature difference between the incoming and return water.
II. SPECIFICATION
| Model | ML-E8 |
| Velocity Range | 0.1 m/s ~ 5.0 m/s |
| Accuracy | ± 2.0% |
| Repeatability | 0.80% |
| Pipe Size | DN15,DN20,DN25,DN32,DN40,DN50,DN65,DN80 |
| Data Storage | Daily, Monthly, Yearly Totalizer |
| Analog output | 4~20mA, Maximum load: 600Ω |
| Alarm output | OCT, Upper and lower limit alarm function (for option) |
| Communication | RS485, (MODBUS or MeterBUS for option) |
| Power Supply | 24VDC |
| Cable Length | 1.8m |
| Keypad | Four light touch buttons |
| Screen | OLED 128*64 screen display |
| Units | Metric and imperial units are available Cubic Meters(m3), Liters(L),USA Gallons(GAL)/hour, USA Gallons(GAL)/min Default unit setting: m3/h |
| Totalizer | Six bit digit |
| Piper Material | Stainless steel pipe, carbon steel pipe, PVC |
| Case Material | Aluminum alloy |
| Environment Temp. | 0℃-50℃ |
| RTD Measuring Temp. | 2℃-105℃ |
| Medium Temp. | 0℃-50℃ |
| Environment Humidity | 0-95% relative humidity, without condensation |
| IP Grade | IP54 |
III.WORKING PRINCIPLE
Ultrasonic flow meters use sound waves at a frequency beyond the range of hearing (typically 0.5, 1, or 4 MHz). This ultrasound signal is sent into a stream of flowing liquid by using wetted (insertion) transducers that make direct contact with the liquid or external (clamp-on) transducers that send the ultrasound through the pipe wall. Clamp-on ultrasonic flow meters allow users to measure the volumetric flow rate of a fluid in a pipe without having to penetrate the pipe which decreases installation and maintenance costs.
A typical transit-time ultrasonic liquid flow meter utilizes two ultrasonic transducers that function as both ultrasonic transmitter and receiver. The ultrasonic flow meter operates by alternately transmitting and receiving a burst of ultrasound between the two transducers by measuring the transit time that it takes for sound to travel between the two transducers in both directions. The difference in the transit time (∆ time) measured is directly proportional to the velocity of the liquid in the pipe.
IV. DIMENSION
| Size | A | B | C | D(mm) | |
| (mm) | (mm) | (mm) | Min | Max | |
| DN15 | 25 | 8 | 58 | 1.5/φ20 | 8/φ23 |
| DN20 | 25 | 15 | 58 | 1.5/φ25 | 4.5/φ28 |
| DN25 | 28.5 | 18.5 | 58 | 1.5/φ32 | 4.5/φ35 |
| DN32 | 29.5 | 24 | 68 | 1.5/φ38 | 8.5/φ45 |
| DN40 | 36 | 27 | 78 | 1.5/φ48 | 7.5/φ54 |
| DN50 | 41 | 32 | 91 | 1.5/φ58 | 7.5/φ64 |
| DN65 | 44.5 | 35.5 | 102 | 1.5/φ65 | 11.5/φ75 |
| DN80 | 1.5/φ76 | 11.5/φ86 | |||
V. APPLICATIONS
ML-F8 also satisfies different clean fluid measurements: various acids, alcohols, chemical solvents,alcohol, beverage water, Coca-Cola water, etc.