DTT31, DTT35
Endress+Hauser 7
a0008181-en
Standard characteristic
A, B: Set monitoring ranges of the flow (example)
LOWF 0%: Setting for the minimum fluid velocity occurring in the monitoring range A or B (0% value)
HIF 100%: Setting for the maximum fluid velocity occurring in the monitoring range A or B (100% value)
Temperature
• Accuracy: 2 K (3.6 °F)
• Repeatability: 1 K (1.8 °F)
• Influence of medium temperature: 0.05 %/K of full scale value
Switch point non-repeatability
Temperature gradient In the event of a temperature change of ≥ 0.5 K/min in the medium, temporary display drifts are possible which
can exceed the specified non-reproducibility values of the switch point.
Sensor reaction time 6 to 12 s
Long-term drift 0.5% per year under reference operating conditions
Long-term reliability Mean time between failure (MTBF) > 100 years
(calculated according to "British Telecom Handbook of Reliability Data No. 5")
Switch output response time 100 ms
Analog output • Maximum measured error = switch point error and display error + 0.1%
• Rise time T
90
: ≤ 200 ms
• Settling time T
99
: ≤ 500 ms
Measuring range
(water as medium)
% of maximum value Influence of
medium temperature
1)
1) The values indicated only apply to the device itself without taking the temperature-dependent change of the thermo-
physical properties of the medium into account. For this reason, we recommend you commission the device at the
process temperature and set the switch points (see 'Learn function' → ä 12)
Influence of
ambient temperature
0.03 to 0.5 m/s
(0.1 to 1.6 ft/s)
≤ 2 % 0.05 %/K 0.04 %/K
0.03 to 1 m/s
(0.1 to 3.28 ft/s)
≤ 3 % 0.10 %/K 0.05 %/K
0.03 to 2 m/s
(0.1 to 6.56 ft/s)
≤ 5 % 0.15 %/K 0.10 %/K
0.03 to 3 m/s
(0.1 to 9.84 ft/s)
≤ 10 % 0.20 %/K 0.30 %/K
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