Technical Data; Power Supply - Endress+Hauser Flowphant T DTT31 Operating Instructions Manual

Technical data

9 Technical data

9. 1 Power supply

Supply voltage
• DC voltage version 18 to 30 V DC
Current consumption
• < 100 mA (open-circuit operation) at 24 V DC, max. 150 mA (open-circuit operation); with
reverse polarity protection
Power supply failure
• Behavior in case of over voltage (> 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 over voltage up to 1 kV (as per EN 61000-4-5). If the supply
voltage is exceeded, the properties specified are no longer guaranteed.
• Behavior in case of under voltage
If the supply voltage drops below the minimum value, the device switches off (status as if not
supplied with power = switch open).
9. 2 Output
Switching capacity
• Switch status ON: I
• Switch status OFF: I
• Switching cycles: > 10,000,000
• Voltage drop PNP: ≤ 2 V
• Overload protection
Automatic load testing of switching current; output is switched off in event of over current,
the switching current is tested again every 0.5 s; max. capacitance load: 14 μF for max. supply
voltage (without resistive load); periodical protective disconnection in event of over current
(f = 2 Hz) and 'Warning' display.
Analog output: Signal on alarm as per NAMUR NE43
• Under ranging:
Linear drop to 3.8 mA
• Over ranging:
Linear rise to 20.5 mA
• Sensor breakage; sensor short-circuit:
≤ 3.6 mA or ≥ 21.0 mA (output 21.7 mA is guaranteed for setting ≥ 21.0 mA)
• Switch outputs: with safe status (switch open)
32
≤ 250 mA
a
≤ 1 mA
a
DTT31, DTT35
Endress+Hauser