Key Highlights of the TF1100-EP Series
01.Non‑intrusive Clamp‑on Design
No pipe cutting or process shutdown required. Transducers mount externally without touching process liquid, avoiding fouling and regular sensor maintenance.
02. Portable & Robust Build
Equipped with a rechargeable 50‑hour battery and color LCD display in a rugged watertight housing; lightweight for easy field transportation between multiple measuring points.
03. Broad Application Compatibility
Supports pipe sizes DN20‑DN5000 with optional Type A / Type B transducers. Operates reliably for clean or slightly turbid liquids (turbidity ＜10000 ppm), covering liquid temperatures from ‑35 °C to 200 °C.
04. Practical On‑site Functions
Built‑in data logger for measurement recording; optional thermal‑energy measurement available when paired with PT1000 temperature sensors.
05. Flexible Output Options
Offers 4‑20 mA, OCT, RS232 / RS485 Modbus outputs to meet diverse industrial monitoring and data‑logging requirements.
06. High‑precision Transit‑time Measurement
This ultrasonic flowmeter delivers outstanding measuring accuracy and stable repeatability, still performing well even in industrial media with a small amount of air bubbles or suspended solids.
1. What Is the TF1100-EP Portable Ultrasonic Flowmeter?
The TF1100-EP is a portable transit-time ultrasonic flowmeter designed for non-intrusive pipeline flow measurement. As a high-performance clamp-on flowmeter, it avoids pipe cutting or process shutdown during installation. The TF1100-EP features reliable accuracy, flexible adaptability and simple operation for full-pipe liquid testing. Optimized for clean fluids, this flowmeter also works with liquids containing tiny air bubbles or suspended solids, making it a practical on-site measuring tool for various industrial monitoring tasks.
TF1100-EP Portable Transmitter with Color LCD Display
Clamp-On Ultrasonic Transducers (IP68, -35°C ~ 200°C)
2. What Are the Main Features of the TF1100-EP?
- 50 hours battery rechargeable battery, multi-line color LCD display.
- A pair of sensors can satisfy different materials, wide different pipe diameters.
- Non-invasive transducer not contact the liquid, fouling and maintenance are eliminated.
- Wide bi-directional flow range and wide liquid temperature range: -35℃~200℃.
- Lightweight and easily transportable in box.
- Data logger function.
- Works reliably in both clean and somewhat dirty liquids with turbidity<10000ppm.
- The heat measurement function by configuring with paired temperature sensors.
- Two transducer types can be optional.
|
Transducer Type |
Applicable Pipe Diameter |
Temperature Range |
|
Type B Transducer |
DN20–DN50 |
-35℃- 200℃ |
|
Type A Transducer |
DN40–DN5000 |
-35℃- 200℃ |
| Velocity Range | 0.01 mm/s to 12 m/s, with bi-directional measurement. |
|---|---|
| Velocity Accuracy | 1% accuracy. |
| Flow Direction Measurement | Measures both forward flow and back flow. |
| Depth Range | 0 to 10 m. |
| Depth Measurement | Pressure sensor and ultrasonic level sensor principles. |
| Enclosure type | Portable |
| Sensor Protection | IP68 |
| Communication | 4-20mA, OCT, RS232, RS485, Data Logger, GPRS |
| Model | DOF6000-W | DOF6000-P |
|---|---|---|
| Type | Wall-mounted | Portable |
| Main Application | Long-term fixed monitoring | Temporary measurement and field testing |
| Installation | Fixed installation | Flexible and movable |
| Best For | Permanent monitoring points | Field surveys and temporary projects |
| Typical Applications | Wastewater channels, rivers and irrigation systems | Flow verification, site surveys and troubleshooting |
Unlike traditional inline flow meters that normally require a full pipe
or dedicated measuring section, the DOF6000 is designed for situations
where the flow cross-section is open or only partially filled.
This makes it particularly useful for existing drainage systems,
wastewater channels, irrigation channels, natural streams and other
locations where installing an inline flow meter would be difficult or costly.
The system combines measured velocity and water depth with configured
cross-sectional geometry to determine the flow area and calculate
the corresponding flow rate.
1. What Is the TF1100-EP Portable Ultrasonic Flowmeter?
The TF1100-EP is a portable transit-time ultrasonic flowmeter designed for non-intrusive pipeline flow measurement. As a high-performance clamp-on flowmeter, it avoids pipe cutting or process shutdown during installation. The TF1100-EP features reliable accuracy, flexible adaptability and simple operation for full-pipe liquid testing. Optimized for clean fluids, this flowmeter also works with liquids containing tiny air bubbles or suspended solids, making it a practical on-site measuring tool for various industrial monitoring tasks.
Area-Velocity Measurement Approach
By combining water velocity and water depth measurements with
cross-sectional geometry, the DOF6000 Series can determine the
effective flow area and calculate flow rate under changing
water-level conditions.
This capability is particularly useful where the flow path is irregular
or where water levels change continuously.
3. What Are the Key Features of the DOF6000 Series Flow Meter?
| Cross-Section Description | Up to 20 coordinate points can be used to describe river cross-sectional shape. |
|---|---|
| Multi-Parameter Measurement | Measures velocity, depth and conductivity simultaneously. |
| Velocity Range | 0.02 mm/s to 12 m/s, with bi-directional measurement. |
| Velocity Accuracy | 1% accuracy. |
| Flow Direction Measurement | Measures both forward flow and back flow. |
| Depth Range | 0 to 10 m. |
| Depth Measurement | Pressure sensor and ultrasonic level sensor principles. |
| Barometric Pressure Compensation | Equipped with barometric pressure compensation. |
| Sensor Protection | IP68 epoxy-sealed sensor body. |
| Communication | RS485/MODBUS output for connection to computers and monitoring systems. |
4. How Does the DOF6000 Series Measure Flow Using the Ultrasonic Doppler Principle?
The DOF6000 Series uses the
Ultrasonic Doppler Principle in Quadrature Sampling Mode
to measure water velocity.
The Ultraflow QSD 6537 sensor transmits ultrasonic energy through
its epoxy casing into the water.
Suspended sediment particles or small gas bubbles in the water reflect
part of the transmitted ultrasonic energy back toward the sensor.
The received signal is then processed to determine water velocity.
This principle is particularly useful for natural and industrial water
applications where suspended particles or small bubbles are present.
The sensor also supports measurement in both forward and reverse
directions, which helps monitor applications where flow direction
can change.
5. How to Install the DOF6000 Series Sensor
The DOF6000 Series includes two configurations:
the DOF6000-W wall-mounted unit for permanent monitoring
and the DOF6000-P portable unit for temporary field surveys.
Both configurations work with the IP68-sealed Ultraflow QSD 6537
submersible multi-parameter sensor.
Recommended Sensor Installation
- Install the sensor on the invert bottom of pipes, culverts
or open-channel beds. - Select a straight flow section whenever possible.
- A minimum upstream straight run of 5× pipe diameter is recommended
for partially filled pipe applications. - Avoid bends, joints and highly disturbed flow sections.
- Keep the sensor approximately parallel to the water surface,
within ±10°, to support accurate depth measurement. - Use stainless-steel expanding band kits for suitable pipe
installations or metal brackets for river and channel installation. - Prevent sediment and silt from covering the sensor measuring faces
during long-term operation.
Installation of the Calculator
The DOF6000-W wall-mounted calculator should be installed indoors
or under suitable shelter and protected from direct sunlight and
heavy vibration.
The DOF6000-P portable calculator is supplied with a protective ABS
hard case and built-in rechargeable battery, supporting up to
50 hours of field operation.
Standard sensor cable length is 15 m, with optional cable lengths
available up to 500 m.
6. Communication and Output Options
The DOF6000 Series provides multiple signal and data output options
for integration with PLC, SCADA, remote monitoring platforms and
local data storage systems.
The system can provide real-time velocity, water depth, conductivity,
instantaneous flow rate and accumulated total flow data.
| Signal Type | Main Function | Key Parameters |
|---|---|---|
| RS485 MODBUS RTU | Remote data reading and partial parameter configuration | 4800–115200 bps; configurable slave address and parity |
| 4–20 mA | Analog output for real-time flow and water depth | Separate channels for flow and depth signal transmission |
| Pulse Output | Totalized flow pulse counting | Cumulative flow volume statistics |
| SD Card Data Logger | Local CSV data storage | 16 GB onboard storage; logging interval from 5 s to 100 h |
| GPRS Optional | Remote data transmission | Suitable for projects without permanent remote transmission infrastructure |
7. What Applications Is the DOF6000 Series Suitable For?
Because of its area-velocity measurement approach, multi-parameter
sensing and flexible installation options, the DOF6000 Series can
be applied to a wide range of open-flow and partially filled-flow
monitoring projects.
Partially Filled Pipes
Suitable for municipal and industrial pipelines where the
pipe is not consistently full.
Culverts
Suitable for buried cross-drainage systems associated
with highways and railways.
Open Channels
Supports rectangular, trapezoidal and U-shaped channels
used for irrigation and drainage.
Rivers and Streams
Suitable for hydrological surveys, flood warning,
water-resource monitoring and ecological projects.
Irrigation Systems
Helps monitor water flow for farmland, orchards,
greenhouses and irrigation management.
Environmental Monitoring
Provides long-term flow data for environmental assessments,
water management and restoration projects.
Industrial Wastewater
Supports flow monitoring for wastewater and waste-liquid
management applications.
8. What Makes the DOF6000 Series a Reliable Solution for Diverse Flow Monitoring Applications?
The DOF6000 Series combines the Ultraflow QSD 6537 sensor with
wall-mounted or portable calculators to provide a flexible approach
to open and semi-closed flow measurement.
Instead of requiring a conventional full-pipe measuring section,
the system can work with partially filled pipes, open channels,
rivers and other irregular flow environments.
One System for Multiple Measurement Requirements
- Water velocity measurement
- Water depth measurement
- Conductivity measurement
- Flow rate calculation
- Total flow calculation
- Bi-directional velocity measurement
- Flexible cross-sectional configuration
- RS485/MODBUS system integration
Whether the requirement is permanent monitoring or temporary field
measurement, the DOF6000 Series provides a practical solution for
professionals working with changing water levels, irregular flow
paths and partially filled systems.
FAQ About the DOF6000 Series Flow Meter
Q1. Does the DOF6000 work with clean water?
The DOF6000 uses the ultrasonic Doppler principle to measure
water velocity. Its operation depends on suspended particles
or small gas bubbles in the water to reflect the ultrasonic
signal back to the sensor. Therefore, it is generally more
suitable for water containing suspended solids or bubbles.
Q2. What parameters can the DOF6000 Series measure?
The DOF6000 Series can simultaneously measure water velocity,
depth and conductivity. When used with the DOF6000 Flow Calculator,
it can also calculate flow rate and total flow.
Q3. What is the difference between the DOF6000-W and DOF6000-P?
The DOF6000-W is a wall-mounted model designed for fixed,
long-term flow monitoring. The DOF6000-P is a portable model
designed for temporary measurements, field surveys and
on-site flow testing.
Q4. How does the DOF6000 Series measure water velocity?
The DOF6000 Series uses the Ultrasonic Doppler Principle in
Quadrature Sampling Mode. Suspended particles or small gas
bubbles reflect ultrasonic signals back to the sensor,
allowing the instrument to calculate water velocity.
Q5. Can the DOF6000 Series measure flow in both directions?
Yes. The DOF6000 Series supports bi-directional velocity
measurement and can measure both forward flow and back flow.
Daniel Chen | Technical Support Engineer
As a Technical Support Engineer at Lanry Instruments,
Daniel Chen has more than 10 years of hands-on experience
in the flow meter industry, covering technical consultation,
field application analysis and customized solution support
for the company's flow meter product range.
Post time: Sep-01-2026