Samson Media 7 5007-1, Монтаж и эксплуатация

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EB 9510 EN 7-7
Start-up and configuration
d) Measuring range (differential pressure span)
Upon delivery, the device is calibrated with a linear characteristic based on the upper mea-
suring range value (differential pressure span) of the dp cell. After entering the tank and gas
data, the device automatically adopts the tank characteristic. Based on the gas data for the
activated gas type, the device calculates the readings and output signal (4 to 20 mA) propor
-
tional to the tank content. In the same way, the device calculates the max. possible differen-
tial pressure ∆p
100
in mbar for the gas type and the predefined reference height (total height
or gauge pipe).
How to proceed:
The user level must be set to 'Specialist' for the measuring range calibration (differential pres-
sure span). See section 7.2.
Î
Observe the sequence:
1.
Calibrate the zero point of differential pressure (see section 7.5 c)).
2. Set and check the measuring range (differential pressure span).
Î
At Δp
100
, the output signal must be 20 mA.
Î
To check the measuring range, connect the differential pressure meter as shown in
Fig. 7-3.
.
Δp
0
= 0,0 % = 4 mA
Δp
100
= 100 % = 20 mA
~
– +
–
+
Precision regulator with Class 0.1
pressure gauge
Supply unit
mA reading
Supply air reducing
station with oil filter
and test pressure
gauge
Test pressure
Fig. 7-3: Test setup
Note