www.gemu-group.com24 / 34GEMÜ 3040
11 Commissioning
Current output 4 to 20 mA
Current [mA]
Value [%]
-20
-10
0
10
20
30
40
50
60
70
80 90 100
110
120
24
22
20
18
16
14
12
10
8
6
4
2
0
Fig.15: Characteristic 4 to 20 mA
Value Current [mA]
Empty metering
tube
3.5
Less than -1.2% 3.8
Between -1.2% and
0%
Linear interpolation of 3.8 to 4 mA
0% (min. range) 4
Between 0% and
100%
Linear interpolation of 4 to 20 mA
100% (max. range) 20
Between 100% and
103%
Linear interpolation of 20 to 20.5 mA
Greater than 103% 22.6
11.2.6.2 Filter strength
The "Filter strength" function determines the formation of
mean values for the analogue output.
Setting range: Weak, medium, strong, off
Factory setting: Weak
In the case of weak mean value formation, the emitted ana-
logue signal responds more quickly. If mean value formation
is strong, the response of the analogue value is slow.
Value [%]
Time [s]
Off
Weak
Medium
Strong
Jump response analogue output
Fig.16: Filter strength function of the analogue output
Filter 100%
Off 16 ms
Weak 0.3 s
Medium 3 s
Strong 30 s
11.2.6.3 Output value
Setting range: Flow, temperature
Factory setting: Flow
Flow measurement for the analogue output
The measured flow is output via the analogue output.
Temperature measurement for the analogue output
The measured temperature is output via the analogue output.
The temperature sensor is not media wetted. It is used to cal-
culate the expansion of the measurement channel. The
sensor is affected by the ambient temperature. The temperat-
ure value responds slowly as it measures the plastic temper-
ature within the sensor pocket.
Jump response time
Response of the temperature sensor after a jump in temperat-
ure. (Filter to "Off")
Jump response time
Time [min]
Temperature [%]
Fig.17: Jump response of the temperature sensor
Effect of ambient temperature
Example of effects of the room temperature on the measured
value.
Medium
temp.
X 0.7 + Ambient
temp.
X 0.3 = Measured
temp.
°C °C °C
40 X 0.7 + 20 X 0.3 = 34
40 X 0.7 + 30 X 0.3 = 37
40 X 0.7 + 40 X 0.3 = 40
°C °C °C
Min. range
The value at which 0 or 4 mA is to be output is set here.
Setting range: 0 to 8000 ml/s (or °C or m/s) + 0 to 900 l/min in
steps of 0.01
Factory setting: 0 ml/s
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