Compact Flow Monitoring for Liquid Applications
The Endress+Hauser Flowphant T DTT31 is a compact thermal flow switch designed for the safe measurement, display and monitoring of relative mass flow rates in liquid media.
Rather than requiring a large and complex flow measurement system, DTT31 provides a practical solution for applications where the primary requirement is reliable flow monitoring, switching and process protection.
Its compact design, low pressure loss and programmable functionality make it particularly well suited to utility systems, equipment protection and industrial process monitoring.
Reliable Monitoring with Practically No Pressure Loss
One of the key advantages of DTT31 is its practically pressure-loss-free measurement. This is particularly valuable in cooling water, lubrication and pump systems where unnecessary pressure loss can affect overall system efficiency.
The device monitors liquid flow within a range of 0.03 to 3 m/s, providing a straightforward way to detect insufficient flow, loss of circulation or other abnormal operating conditions.
Compact Design, Flexible Configuration
DTT31 is designed as an intelligent and programmable insertion-type flow switch. Its compact construction makes it easy to integrate into industrial equipment and process piping.
The device can be configured with different output combinations depending on the application:
1 × PNP switch output
2 switch outputs
1 switch output + 4–20 mA analog output
Analog output can be used for flow or temperature values
This flexibility allows one compact instrument to handle different monitoring requirements.
Key Performance
Measuring principle: Thermal
Flow range: 0.03–3 m/s
Measurement error: 2–10%, depending on measuring range
Medium temperature: -20 to +85 °C
CIP temperature: Up to 130 °C
Process pressure: Up to 100 bar
Protection: IP66
Display: LED / LCD
Output: PNP switching and optional 4–20 mA
Nominal diameter range: DN25–DN1000
Flow and Temperature Monitoring in One Device
DTT31 is not limited to flow switching. Depending on the selected configuration, the instrument can also provide temperature monitoring through its analog output.
This makes it useful where both flow and temperature are important for protecting equipment or monitoring process conditions without installing separate instruments.
Easy On-Site Monitoring
The integrated digital display provides local process information and function checking directly at the device. The housing top can be rotated by 310°, while the display can also be rotated, allowing the measured value to remain easy to read in different installation positions.
Configuration can also be performed using FieldCare, allowing device settings to be configured and stored efficiently.
Suitable for Demanding Industrial Applications
With a maximum process pressure of 100 bar and IP66 protection, DTT31 is suitable for a wide range of industrial monitoring tasks. The device can also handle CIP temperatures up to 130 °C, making it suitable for applications where regular cleaning is required.
Typical applications include:
Cooling water circulation monitoring
Pump and heat exchanger protection
Compressor and turbine cooling systems
Pump lubrication monitoring
Process line leak monitoring
Pump functionality monitoring
Filter monitoring in the beverage industry
Frequently Asked Questions
What is the Flowphant T DTT31 used for?
DTT31 is primarily used to monitor and switch liquid flow, helping detect insufficient flow, loss of circulation, leaks or equipment operating problems.
Does DTT31 cause significant pressure loss?
No. One of its main advantages is practically no pressure loss, making it particularly suitable for cooling and lubrication circuits where maintaining flow efficiency is important.
Can DTT31 monitor temperature as well as flow?
Yes. Depending on the selected output configuration, the device can provide an analog output for temperature monitoring or flow percentage.
What is the maximum process pressure?
The maximum process pressure is 100 bar.
Can DTT31 be used for CIP applications?
Yes. Although the normal medium temperature range is -20 to +85 °C, the device can be CIP-cleaned at temperatures up to 130 °C.
What makes DTT31 different from a conventional flowmeter?
DTT31 is designed primarily as a compact flow switch for monitoring and process protection, rather than as a high-accuracy flow measurement instrument. It provides the switching, display and optional analog functionality needed for practical industrial monitoring in a compact device.
