Endress+Hauser Flowphant T DTT31 - Function and System Design

DTT31, DTT35
2 Endress+Hauser
Function and system design
Measuring principle
T09-DTT31xxx-15-xx-xx-xx-000
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.
Measuring system Overview
Flowphant
®
product family
DTT31 DTT35
a0005276
T09-TTR35xxx-14-xx-xx-xx-000
Measurement
probe
RTD RTD
Field of
application
Monitoring of the mass flow of water, water-
like substances and low-viscosity oils.
Monitoring of the mass flow of liquid media
in hygienic processes.
Process
connection
• Compression fitting
•Thread:
− G½" and G¼"
− ANSI NPT ¼" and NPT ½"
•Hygiene:
− Conical metal-metal G½"
− Clamp 1" - 1½", 2"
− Varivent F, N
− DIN 11851
− APV-Inline
Measuring range Mass flow as a relative value between 0 and 100%.
Process measuring limit, liquids: 0.03 to 3 m/s (0.1 to 9.84 ft/s)