Product description
DMTFB Ultrasonic Flowmeter
Features
- Hot-reset installation, no interruption to pipeline flow
- Internal batch control configuration for suitable and accurate operation
- Accumulation segmented transducer for long-term stability and best accuracy
- No moving parts, no pressure drop, no maintenance
- Wide bidirectional flow range: ± 40 m/s (0 ± 12 m/s)
- Pipe sizes from 65 mm to 4570 mm
- Signal quality monitoring and self-adaptive capabilities
- Extended transducers for pipes with wall thicknesses up to 100 mm, improved for cement pipelines
- Optional SD card data logger up to 8 GB, with user-configurable time intervals
- Suitable for high temperatures: -40 to 150°C
DMTFC Ultrasonic Flowmeter Specifications
The DMTF Series Insertion Transit Time Ultrasonic Flowmeter provides robust capabilities for accurate liquid flow measurement from the outside of a pipe. This ultrasonic transmission/reception, digital signal processing, and transit time measurement utilize state-of-the-art technologies. Specialized signal quality monitoring and self-adaptive technologies ensure the system optimally adjusts to different pipe materials automatically. Due to the hot-mounted insertion transducers, there are no ultrasonic coupling and connection issues; even though the transducers are placed on the pipe wall, they do not create any disturbance or pressure drop in the flow, making them non-intrusive. The insertion (wet) type offers advantages in long-term stability and better accuracy.
Applications:
- Water, hot water, chilled water, city water, seawater, etc.
- Secondary sewage, wastewater treatment, etc.
- Oil, diesel, fuel oil, lubrication oil, etc.
- Beverages, food, and pharmaceutical processing
- HVAC, energy measurement systems, etc.
Measurement Principle
The DMTF transit time flowmeter uses ultrasonic transmitters and receivers, utilizing two transducers. The transducers are clamped to the outside of a closed pipe at a specific distance apart. When mounted, the transducers can be oriented in various configurations: ultrasonic waves may pass through the pipe four times (Z-method), or twice (V-method), or just once if the pipe edges are mounted accordingly. The mounting method is selected based on pipe and liquid characteristics. During operation, the flowmeter transmits ultrasonic signals with both transducers, receiving amplified signals first in the downstream direction and then in the upstream direction (Figure 1). Due to the faster upstream flow, the time difference (Δt) will occur. When there is no flow, the time difference (Δt) is zero. Thus, knowing the time difference for both upstream and downstream directions, flow speed (V) and flow volume (Q) can be calculated using the following formula:
- V = K * D * t △
- V: Liquid velocity
- K: Constant
- D: Distance between the two transducers
- Δt: Time difference of flight
