Proline Prosonic Flow 91 Technical data
Endress+Hauser 61
10.1.4 Output
Output signal Current output
• Galvanically isolated
• Full scale value adjustable
• Temperature coefficient: typ. 2 μA/°C, resolution: 1.5 μA
• Active: 4 to 20 mA, R
L
< 700 Ω (for HART: RL ≥ 250 Ω)
Pulse/status output:
• Galvanically isolated
• Open collector
• 30 V DC / 250 mA
• Passive
• Can be configured as:
– Pulse output: pulse value and pulse polarity can be selected, max. pulse width adjustable
(5 to 2000 ms), pulse frequency max. 100 Hz
– Status output: for example, can be configured for error messages, empty pipe detection, flow
recognition, limit value
Signal on alarm • Current output, pulse output → Failsafe mode can be selected → ä 99
• Status output → "Not conductive" in the event of fault or power supply failure
Load See "Output signal"
Low flow cut off Low flow cut off → Switch-on point can be selected as required
Galvanic isolation All circuits for inputs, outputs and power supply are galvanically isolated from each other.
10.1.5 Power supply
Electrical connections See → ä 22
Supply voltage
(power supply)
Transmitter
85 to 250 V AC, 45 to 65 Hz
20 to 28 V AC, 45 to 65 Hz
11 to 40 V DC
Sensor
Powered by the transmitter
Cable entry Power supply and signal cables (inputs/outputs):
• Cable entry M20 × 1.5 (8 to 12 mm; 0.31 to 0.47 in)
• Thread for cable entries ½" NPT, G ½"
Cable specifications See → ä 23
Power consumption 85 to 250 V AC: < 12 VA (incl. measuring sensor)
20 to 28 V AC: < 7 VA (incl. measuring sensor)
11 to 40 V DC: < 5 W (incl. measuring sensor)
Power supply failure Lasting min. 1 power cycle.
HistoROM/T-DAT save measuring system data if the power supply fails.
Potential equalization For potential equalization, no special measures are necessary.
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