Function And System Design; Measuring Principle - Endress+Hauser Flowphant T DTT31 Technical Information

Measuring principle

Measuring system
2

Function and system design

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.
Overview
Flowphant DTT31
product family
Measurement RTD
probe
Field of Monitoring of the mass flow of water,
application water-like substances and low-viscosity oils
(viscosity: 0.184 to 20.0 mPa*s; thermal
conductivity: 29 to 688 mW/mK). Example:
Aqueous solution monoethylenglycol (20
vol%) at 20 °C: Viscosity: 1.65 mPa*s;
thermal conductivity: 512 mW/mK
Process • Compression fitting
connection • Thread:
− G½" and G¼"
− ANSI NPT ¼" and NPT ½"
%
v
m
A0005276
DTT31, DTT35
DJ
DTT35
RTD
Monitoring of the mass flow of liquid
media in hygienic processes (viscosity:
0.184 to 20.0 mPa*s; thermal
conductivity: 29 to 688 mW/mK).
Example: Aqueous solution
monoethylenglycol (20 vol%) at 20 °C:
Viscosity: 1.65 mPa*s; thermal
conductivity: 512 mW/mK
• Hygiene:
− Conical metal-metal G½"
− Clamp 1" - 1½", 2"
− Varivent F, N
− DIN 11851
− APV-Inline
Endress+Hauser
A0023188
A0023194