Output variables
Output signal
•
Current output:
active, 0/4...20 mA, galvanically isolated,
R
L
< 700 Ω (with HART: R
L
≥ 250 Ω),
time constant selectable (0.01...100 s),
full scale value freely selectable,
temperature coefficient: typical 0.005 % o.r./°C; resolution: 10 µA
•
Pulse / frequency output:
active/passive selectable, galvanically isolated
active: 24 V DC, 25 mA (max. 250 mA during 20 ms), R
L
> 100 Ω
passive: Open Collector, 30 V DC, 250 mA
Frequency output:
Full scale frequency 2...10000 Hz, pulse/pause ratio 1:1,
pulse width max. 2 s
Pulse output:
Pulse value and pulse polarity selectable
Pulse width adjustable (0.05...2 s)
Above a frequency of 1 / (2 x pulse width) the pulse/pause ratio is 1:1
•
Alarm output (Relay 1):
Either NC or NO via a jumper available (factory setting: NO contact)
max. 60 V AC / 30 V DC; max. 0.5 A AC / 0.1 A DC, galvanically isolated.
Configurable for: error message (failure), empty pipe detection (EPD),
failure + EPD, full scale switching, batch precontact, direction of flow,
limit value 1 and overflow (v > 12.5 m/s)
•
Status output (Relay 2):
Either NC or NO via a jumper available (factory setting: NC contact)
max. 60 V AC / 30 V DC; max. 0.5 A AC / 0.1 A DC, galvanically isolated.
Configurable for: empty pipe detection (EPD), full scale switching,
batch contact, direction of flow, limit value 2 and overflow (v > 12.5 m/s)
Signal on alarm
• Current output → failsafe mode selectable (see page 51)
• Pulse/frequency output → failsafe mode selectable (see page 57)
• Relay 1 output → de-energised on “FAILURE” or power failure
• Relay 2 output → de-energised on power failure
Error response of outputs (detailed description) → see page 85
Load
R
L
< 700 Ω (current output)
Creep suppression
• Switching points selectable (see page 72)
• Max. creepage depends on the nominal diameter at v = 1 m/s
• Hysteresis: 50% of set creepage
Accuracy
Reference conditions
According to DIN 19200 and VDI/VDE 2641:
Fluid temperature +28 °C ± 2 K
Ambient temperature +22 °C ± 2 K
Warm up period 30 minutes
Mounting
– Inlet section > 10 x DN
– Outlet section > 5 x DN
– Transmitter and sensor are grounded.
– The sensor is built-in centered into the piping.
9 Technical Data Promag 33
108 Endress+Hauser
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