Flow switch for monitoring of mass flow

Flowphant T DTT31

11-35 Pcs.


  • Three buttons for local set-up, via ReadWin 2000 configuration software or FieldCare

  • On-site display

  • High reproducibility and long-term stability

  • Large turndown

  • Negligible pressure loss


Measuring range:
0.03 to 3 m/s

Medium temperature:

-20 to +85 C

Process pressure:

0 to +100 bar (at 20 C)

Product/VersionPrice/pcs. in NZ$Order code
Flowphant DTT31
Process connection; LengthElectrical ConnectionPower Supply; Output1 to 34 to 1011 to 35
Thread 1/2" BSP Length 30mmPlug M1218-30VDC; switch PNP + 4-20mA630.-586.-554.-DTT31-A1C111AE2AAB
Thread 1/2" BSP Length 100mm630.-586.-554.-DTT31-A1C111AE2CAB
Plug and cable to be ordered as 'accessory'.
The above models are ex stock. Please ask for pricing and delivery time of other DTT31 versions.
Product/VersionPrice/pcs. in NZ$Order code
Accessories1 to 34 to 1011 to 35
M12 right-angle plug with 4-core, 5m PVC cable30.-52010285
Configuration kit TXU10- for PC-programmable devices. set-up programme+interface cable for PC with USB-Port.300.-TXU10-BA

Prices are net, ex store Auckland, GST additional and valid until 30/9/2016.
EMC's standard Terms and Conditions of Supply are applicable.


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. 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.

Technical data


  • Measurement range

0 to 100 %; resolution 1 %
0.03 to 3 m/s for liquids

  • Output signal
1PNP with analog output for flow and temperature
  • Voltage drop PNP
≤ 2 V
  • Overload protection
Automatic testing
Performance 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

  • Sensor reaction time
6 to 12 s
  • Response time
Switch output 100 ms
Operating conditions
  • Medium temperature
-20 to +85 C
  • Ambient temperature
-40 to +85 C
  • Degree of protection
With M121: IP 66
Power supply
  • Supply voltage Ub
18 to 30 V DC, reverse polarity protection
  • Current consumption
Without load < 100 mA at 24 V DC
  • 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
  • Desina compliant

Dimensions (in mm)


L = sensor length 30 mm, 100 mm

Installation according to operation instructions

Process connections (Dimensions in mm)

ISO 228 G A, 316L

Installation according to operation instructions

Electrical connection

DC voltage version with M121 connector

A3: PNP switch output, additional analog output