Output - Endress+Hauser Proline Prosonic Flow 90 Operating Instructions Manual

10 Technical data
Output signal
Signal on alarm
Load
Switching output
Low flow cutoff
Galvanic isolation
96
10.1.4

Output

Current output:
Active/passive selectable, galvanically isolated, time constant selectable (0.05...100 s),
full scale value selectable, temperature coefficient: typically 0.005% o.r./°C,
resolution: 0.5 µA.
< 700 Ω (for HART: R
• active: 0/4...20 mA, R
L
• passive: 4...20 mA, operating voltage 18...30 V DC, R
Pulse/frequency output:
Passive, open collector, 30 V DC, 250 mA, galvanically isolated.
• Frequency output: full-scale frequency 2...1000 Hz (f
on/off ratio 1:1, pulse width max. 10 s
• Pulse output: pulse value and pulse polarity selectable, max. pulse width adjustable
(0.05...2000 ms), above a frequency of 1 / (2x pulse width) the on/off ratio is 1:1.
• Current output → failsafe mode selectable (e.g. in accordance with NAMUR
Recommendation NE 43)
• Pulse/frequency output → failsafe mode selectable
• Status output → "not conductive" in the event of fault or power supply failure
Detailed data → Page 86
see "Output signal"
Status output:
Open collector, max. 30 V DC / 250 mA, galvanically isolated
Configurable for: error messages, flow direction, limit values
Switch points for low flow cutoff are selectable
All circuits for inputs, outputs, and power supply are galvanically isolated from each other.
Proline Prosonic Flow 90
≥ 250 Ω)
L
< 700 Ω
L
= 1250 Hz),
max
Endress+Hauser