The Series DMHF adopt the MultiPulseTM Technology, Digital Signal Processing Technology and Error Correction Technology, which are the state-of-the-art non-invasive flow measurement technology, with a measuring system of very high accuracy, versatility, low cost of installation and ownership. The meter can calculate automatically caloric content of water under 0℃~200℃ temperatures, and can obtain instantaneous caloric value and totalized caloric value. The pipe range should be DN15-2500 (For series Insertion, the allowed pipe range is DN65-2500. For series Flanged, the allowed pipe range is DN20-2500.).

Features

1. For transmitter, users can select fixed types or Portable types.

2. For transducer, non-invasive Clamp-on and Insertion type are available.

3. For temperature sensor, utilize Pt1000 with 0.1%, clamp-on and the Insertion type are available.

4. Internally configured batch controller makes batch control convenient and accurate.

5. No moving parts, no pressure drop, no need of maintenance.

6. Easy and economical installation, hot-tapped installation.

7. Daily, monthly and yearly totalized flow: totalized flow for the last 64 days and months as well as for the last 5 years can be reviewed.

8. Optional SD card Data logger output, can memory Total heat flow, Heat flow rate, etc.

Applications

1. Measuring heat flow

2. Sewage and drainage water with small particle quantity.

3. Oil, including crude oil, lubricating oil, diesel oil, fuel oil, etc.

4. Beverage and food processors

5. HVAC hot and cool water, water /glycol solutions.

6. Water and waste treatment

7. Power plants, heat energy boiler feed water.

8. Energy consumption supervision and water conservation management

9. Metallurgy and miming applications (e.g., acid recovery)

10. Marine operation and maintenance

11. Pulp and paper industries

12. Pipeline leak detection, inspection, tracking and collection

13. Energy measurement and balancing

Principle

DYNAMETERS Heat Meter is designed to measure the fluid velocity and temperature of liquid within a closed pipe. The transducers are a non-invasive, clamp-on type, which will provide benefits of non-fouling operation and easy installation. The temperature sensors are Pt1000 and have high accuracy.

When measuring velocity, the DMHF transit time heat 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 heat 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 between the transit-time is directly and exactly related to the velocity of the Liquid in the pipe, as shown in Figure 1.

V= K*D* dt

Where: V: Liquid velocity

K: Constant

D: Distance between the transducers

dt: difference in time of flight

When measuring temperature, the two temperature sensors of Pt1000 clamp on the pipeline or insert in the pipe, and get two temperature values.

The value of energy is indicated / measured based on the following mathematical model:

Q=

Where: Q – Volume of heat taken

V – Volume of flowing water

k – Heat coefficient of water

t1 – Inlet temperature of water

t2 – Outlet temperature of water