High reproducibility and long-term stability
Specs at a glance
Medium Liquids Measuring range 0.03 to 3 m/s (0.1 to 9.84 ft/s) Medium temperature –20 to +85 °C (–4 to +185 °F) Process pressure 0 to +100 bar (0 to 1450 psi) at 20 °C (68°F)
Product / Version Price / pcs. in USD Order code Process Connection
Insertion Length L; Diameter D
Power Supply; Output Electrical Connection 1 to 3 4 to 10 11+ 1/4NPT / 1/2NPT / G1/4A / G1/2A
L = 30mm / 100mm; D = 6mm
18-30VDC; 1x switch PNP Plug M12 377.- 351.- 332.- DTT31-A1A111xxxxAB Plug ISO4400 NPT1/2 403.- 375.- 354.- DTT31-A3A111xxxxAB 18-30VDC; 2x switch PNP Plug M12 403.- 375.- 354.- DTT31-A1B111xxxxAB 18-30VDC; switch PNP + 4-20mA Plug M12 462.- 430.- 407.- DTT31-A1C111xxxxAB W/o, compr. fitting 316L, L=>100mm insertion length, compr. fitting, to order separately. 18-30VDC; 1x switch PNP Plug M12 369.- 343.- 325.- DTT31-A1A111AA2CAB Plug ISO4400 NPT1/2 395.- 367.- 347.- DTT31-A3A111AA2CAB 18-30VDC; 2x switch PNP Plug M12 395.- 367.- 347.- DTT31-A1B111AA2CAB 18-30VDC; switch PNP + 4-20mA Plug M12 454.- 422.- 400.- DTT31-A1C111AA2CABPlug and cable to be ordered as 'accessory'
Product / Version Price / pcs. in USD Order code Collar welding boss d6 PEEK + screw moveable with sealing taper, washer + pressure screw G1/2, material of wetted parts: 316L, PEEK, max. Prozessdruck: 10 bar (145 psi) 103.29 51004751 Cable M12x1 l=5m 5m cable 4x 0.34 mm2, molded PVC angled connector, M12x1 connector screw Cu Sn/Ni, IP67. 14.26 51005148 Configuration kit TXU10- for PC-programmable devices. set-up programme+interface cable for PC with USB-Port. 4 pin plug + ReadWin2000 144.71 TXU10-AA
Prices valid until 31.03.2019 in USD per unit (not including shipping and applicable sales tax). See
Endress+Hauser Terms and Conditions
The Flowphant T DTT31 is a flow switch for monitoring, displaying and measuring relative mass flow rates of liquid media in the range from 0.03 to 3 m/s (0.1 to 9.84 ft/s). Application examples include: Monitoring cooling water circulation systems of pumps, turbines, compressors and heat exchangers and monitoring lubrication systems.
The device measures the mass flow of a liquid medium with the calorimetric measurement method. The calorimetric measuring principle is based on cooling a heated temperature sensor. Heat is removed from the sensor by forced convection due to medium flowing by. The extent of this heat transfer depends on the medium velocity and the difference in temperature between the sensor and medium (King's law). The higher the velocity or the mass flow of the medium, the greater the temperature sensor cooling.
0 to 100 %; resolution 1 %
0.03 to 3 m/s (0.1 to 9.84 ft/s) for liquidsOutput
Output signal 1 × PNP, 2 × PNP or 1 × PNP with analog output for flow and temperature Voltage drop PNP ≤2 V Overload protection Automatic testingPerformance characteristics Reference conditions According to DIN IEC 60770/61003 Measured error Switch point and display 0.2 % Long-term drift ≤0.5 % per year under reference operating conditions Sensor reaction time 6 to 12 s Response time Switch output 100 msOperating conditions Medium temperature –20 to +85 °C (–4 to +185 °F) Ambient temperature –40 to +85 °C (–40 to +185 °F) Degree of protection
With NPT½" plug: IP 65
with M12 × 1: IP 66Power supply
Supply voltage Ub 18 to 30 V DC, reverse polarity protection Current consumption Without load <100 mA at 24 V DCGeneral EMC Interference emission as per IEC 61326 Series, class B electrical equipment; interference immunity as per IEC 61326 Series, appendix A (indust. use) and NAMUR Recomm. NE 21 Operating elements 3 buttons or PC and software Materials Process connection, protecting tube and housing 316L
Dimensions in mm (inches)
Technical DatasheetMore documents for DTT31