Performance Characteristics - Endress+Hauser Flowphant T DTT31 Technical Information

Supply voltage
Current consumption
Power supply failure
Reference operating
conditions
Maximum measured error
6
• DC voltage version with valve connector M16x1.5 or NPT ½"
Item No. Output setting
B 1x PNP switch output
DC voltage version
18 up to 30 V DC (reverse polarity protection)
< 100 mA (without load) at 24 V DC, max. 150 mA (without load); with reverse polarity protection
• Behaviour in case of overvoltage (> 30 V)
The device works continuously up to 34 V DC without any damage.
No damage is caused to the device in case of a short-term overvoltage up to 1 kV (as per EN 61000-4-5).
The specific properties are no longer guaranteed if the supply voltage is exceeded.
• Behaviour in case of undervoltage
If the supply voltage drops below the minimum value, the device switches off (status as if not supplied with
power = switch open).

Performance characteristics

The percentage information in the "Performance characteristics" section refers to the full scale value or the set
maximum value (100% value) of the monitoring range.
As per DIN IEC 60770 or DIN IEC 61003
T = 25 °C ± 5 °C (77 °F ± 9 °F), relative humidity 45 to 75 %, ambient air pressure 860 to 1060 kPa
(124 to 153 PSI), water test medium. Supply voltage U = 24 V DC.
Flow
The device records fluid velocity relatively in relation to a set monitoring range of the flow (0 to 100 % as
display value). An absolute measurement of the fluid velocity or the mass flow is not possible. The sensitivity
of the calorimetric flow sensor changes with the fluid velocity. It increases with decreasing fluid velocity (for
example, with water, the greatest sensor sensitivity is recorded in the range from 0.03 to 0.5 m/s).
DTT31, DTT35
Order code (see Ordering information section)
DTT3x-A2A*******; DTT3x-A3A*******
Endress+Hauser
P01-PTx3xxxx-04-xx-xx-xx-003