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Flowphant T DTT31 Flow switch

Safe monitoring of flow rates and temperature in industrial processes. Compact and cost-saving

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Flowphant T DTT31 Flow switch

Safe monitoring of flow rates and temperature in industrial processes. Compact and cost-saving

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Benefits

  • Practically no pressure loss
  • Configuration software FieldCare for quick configuration and reliable storage of device settings
  • Optional: second switch output or 4 to 20 mA analog output for temperature monitoring or for outputting the flow as a percentage
  • Function check and process information onsite thanks to digital display at device
  • Top housing section which can be rotated 310° and rotatable display make it possible to read the measured values in all orientations
  • Marine approval
FLEXible answers to individual needs
Current product

Flowphant T DTT31 Flow switch

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  • Simple products
  • Easy to select, install and operate

What is FLEX?

FLEX selections
Technical excellence
Simplicity
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Fundamental selection Meet your basic measurement needs
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Lean selection Handle your core processes easily
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Extended selection Optimize your processes with innovative technologies
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Xpert selection Master your most challenging applications
Variable
5-year warranty

Engineered for Confidence

Our Fundamental Selection instruments feature an extended 5-year warranty – a clear testament of our trust in their long-term reliability and performance.

Should a warranty case occur, you can count on a fast replacement process and minimal administrative effort – giving you peace of mind when it matters most and helping you keep your operations running smoothly.

Warranty terms apply

The extended warranty is subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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24/7 customer portal

Personalized transaction space

Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

My Endress+Hauser – all in one place

My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

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Office situation support
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Product information

Product picture flow switch DTT31
DTT31
Specifications
Measuring / Application task Liquids
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Description

The switch is designed for the safe measurement, display and monitoring of relative mass flow rates of liquid media with practically no pressure loss. It can be selected between one or two switch outputs as well as one switch output and one standardized analog output for flow rates or temperature values. Typical applications are: Monitoring cooling water circulation processes or lubrication systems of pumps and heat exchangers or leak monitoring in process lines.

Field of application

Flow switch for monitoring and displaying relative mass flow rates of liquid media in the range from 0.03 to 3 m/s (0.1 to 9.84 ft/s). Flowphant T DTT31 − with thread connections or coupling.

Application examples:

  • Monitoring cooling water circulation systems of pumps, turbines, compressors and heat exchangers
  • Leak monitoring in process lines
  • Monitoring pump functionality
  • Monitoring lubrication systems
  • Filter monitoring in the beverage industry
Benefits
  • Practically no pressure loss
  • Configuration software FieldCare for quick configuration and reliable storage of device settings
  • Optional: second switch output or 4 to 20 mA analog output for temperature monitoring or for outputting the flow as a percentage
  • Function check and process information onsite thanks to digital display at device
  • Top housing section which can be rotated 310° and rotatable display make it possible to read the measured values in all orientations
  • Marine approval
Downloads
Most downloaded
Operating Instruction (BA)
Operating Instructions Flow switch Flowphant T DTT31, DTT35 Flow switch for safe measurement and monitoring of mass flow and
temperature in industrial processes
English version - 02/2006
Download
Technical Information (TI)
TI Flowphant T DTT31, Flowphant T DTT35 Flow switch Safe monitoring of flow rates and temperature in industrial processes. Compact and cost-saving
English version - 12/2025
Download
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
The CAD Drawings will be available after the configuration.
All downloads
20 Downloads
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
Technical Information (TI)
Most downloaded
TI Flowphant T DTT31, Flowphant T DTT35 Flow switch Safe monitoring of flow rates and temperature in industrial processes. Compact and cost-saving
English version - 12/2025
Download
Operating Instruction (BA)
BA Flowphant T DTT31, Flowphant T DTT35 Flow switch
English version - 12/2025
Download
Operating Instruction (BA)
Most downloaded
Operating Instructions Flow switch Flowphant T DTT31, DTT35 Flow switch for safe measurement and monitoring of mass flow and
temperature in industrial processes
English version - 02/2006
Download
Operating Instruction (BA)
ReadWin® Quick Setup Operating Manual
ReadWin® Quick Setup Temperature
PC Software
English version - 02/2005
Download
Installation Instructions (EA)
Kupplung für Anschlusskabel M12 Kupplung für Anschlusskabel M12
IP67,PG7, 4pol.M12, Kabelkonfektionierung
English version - 04/2026
Download
Special Documentation (SD)
UKCA marking Flow, density, concentration, viscosity
English version - 11/2022
Download
Special Documentation (SD)
Device viewer Technical documentation in other languages
English version - 07/2021
Download
Competence Brochure (CP)
Catálogo soluciones esenciales Alta calidad a precios competitivos
Spanish version - 01/2017
Download
Manufacturer Declaration
Product family: Accessories: Bar stock thermowell, Accessories: Pipe thermowell, Accessories: Inserts, Magphant, Process RTD general purpose, Process RTD hygienic, RTD thermometer Product root: DTT31-, DTT35-, TK40-, TM101-, TM111-, TM121-, TM131-, TM311-, TM371-, TM372-, TM401-, TM402-, TM411-, TM412-, TMR35-,
TS111-, TS212-, TT131-, TT151-, TT411-, TT412-
Declaration number: HE_01494_02.26
Manufacturer specification: Food hygiene
Additional information: BSE, TSE
English version - 07/2026
Download
Manufacturer Declaration
Product family: Magphant Product root: DTT31-, DTT31L-, DTT35-
Declaration number: ЕАЭС KZ 7500533.13.12.04147
Manufacturer specification: EMC
Russian version - 08/2024
Download
Manufacturer Declaration
Product family: Accessories: RTD insert, Accessories: TC insert, Accessories: Inserts, Magphant, Multipoint thermometers, Process RT D direct contact, Process RTD general purpose, Process RTD heavy duty, Process RTD hygienic, Process TC heavy duty, RTD thermometer Product root: DTT31-, DTT35-, TAF11-, TAF12D-, TAF12S-, TAF12T-, TAF16-, TC15-, TC65-, TC66-, TH11-, TM101-, TM111-, TM112-, TM121-,
TM131-, TM151-, TM152-, TM311-, TM371-, TM372-, TM401-, TM402-, TM411-, TM412-, TM611-, TMR31-, TMR35-, TMS01-, TMS02-, TMS11-, TMS
12-, TMS21-, TMS31-, TPR100-, TPR300-, TR15-, TR65-, TR66-, TS111-, TS211-, TS901-, TST434B-, TTR31-, TTR35-
Declaration number: HE_02286_01.25
Manufacturer specification: RoHS
Additional information: China RoHS
English version - 12/2025
Download
EU Declaration
Product family: Industrial modular thermometer, Low cost RTD general purpose, Magphant, Plugs RTD direct contact, Process RTD direct contact, Process RTD direct in contact, Process RTD explosion proof, Process RTD general purpose, Process RTD heavy duty, Process R TD hygienic, Process TC direct contact, Process TC direct in contact, Process TC explosion proof, Process TC general purpose, Proces s TC heavy duty, RTD thermometer, TC heavy duty Product root: DTT31-, DTT31L-, DTT35-, DTT35L-, GPTL-, MLTTS00-, MLTTS01-, OTR31-, OTR35-, OTR90-, OTR91-, OTR92-, OTR93-, OTR94-, O
TR95-, OTR96-, TMR31-, TMR31L-, TMR35-, TMR35L-, TMT470L-, TTR31-, TTR35-
Declaration number: EC_00568_03.24
English version - 02/2024
Download
EU Declaration
Product family: Magphant Product root: DTT31-, DTT35-
English version - 04/2008
Download
UK Conformity Assessed
Product family: Magphant, RTD thermometer Product root: DTT31-, DTT35-, TTR31-, TTR35-
Declaration number: UK_00475_01.21
Additional information: UK Doc NonEx
English version - 12/2021
Download
Product Carbon Footprint Information
Product family: Magphant Product root: DTT31-
Declaration number: ED_00174_01.24
English version - 11/2024
Download
Miscellaneous
Product family: Magphant Product root: DTT31-
Region: Italy
Approval agency: CETENA
English version - 07/2010
Download
Marine
Product family: Magphant Product root: DTT31-
Region: International
Approval agency: RINA
English version - 12/2017
Download
Marine
Product family: Magphant Product root: DTT31-
Region: International
Approval agency: DNV
English version - 07/2023
Download
Tender Text
Flowphant DTT 31 Thermischer Durchflussschalter zur Überwachung von Flüssigkeiten
German version - 12/2012
Download

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Spare parts and accessories

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Order code 71535688
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Compression Fitting TA50

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Order code TA50-

Configuration Kit TXU10

Order code TXU10-

Cable M12x1 l=5m

Order code 51005148
Spare parts & accessories
Product picture flow switch DTT31
DTT31

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DTT31
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Add your product to the cart and request a quote. Whether it is un-configured, partially configured, or fully configured, our experts will contact you to complete the configuration and provide your quote.

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Spare parts and accessories

further parts
further parts

Gasket rubber cap CDI-connector

further parts
further parts
Order code 71535688
further parts
further parts

Compression Fitting TA50

further parts
further parts
Order code TA50-

Configuration Kit TXU10

Order code TXU10-

Cable M12x1 l=5m

Order code 51005148
Spare parts & accessories

Selection of compatible products

/