Liquitrend QMW43
Technical data
Hauser
37
Signal on alarm
The behavior of the output in the event of a failure is regulated in accordance with
NAMUR NE43.
Frequency
f < 260 Hz
Current
I < 3.6 mA (as per NAMUR NE43)
• Failure current is output and "S803" displayed (output: MIN alarm current)
• Periodic checking to establish if it is possible to quit fault state
Signal range
• Frequency, lower range value: 300 Hz
• Frequency, end: 3
000 Hz
• Signal range: 270 to 3
100 Hz
• Current: 3.8 to 20.5 mA
Load
Load for 4 to 20 mA output
Depends on the supply voltage U
B
of the power supply unit: do not exceed the maximum
load resistance R
L
(including supply line resistance) as otherwise it will not be possible to
set the corresponding current.
[ ]
W
20
30
10
0
1119
643
[V]
R
Lmax
U
B
167
U
B
-6.5 V
21 mA
R
Lmax
R
Lmax
=
A0041303
16
Load for 4 to 20 mA output
17.3 Performance characteristics
Reference operating
conditions
• Ambient temperature: constant 20 °C (68 °F) ±5 °C (9 °F)
• Medium: water, conductivity approx. 200 µS/cm
• Medium temperature: 20 °C (68 °F) ±5 °C (9 °F)
• Conductivity: fully covered, sensor covered by 20 mm of medium
• Coverage: up to max. 6 mm
Maximum measured error
under reference conditions
Conductivity
≤ 5 %
Typical measured error
Conductivity
0 to 2 mS/cm: ≤ 5 % of reading ± 0.2 µS/cm
2 to 20 mS/cm: ≤ 7 % of reading
20 to 50 mS/cm: ≤ 10 % of reading
50 to 100 mS/cm: ≤ 15 % of reading
The sensor must be covered by at least 20 mm of medium.
