26
EB 9527-3 EN
Settings
Activate write protection by setting switch
4
to
ON
.
Place the valve block or equalizing valve
back into the operating position:
1.
Open the shut-off valve in the low-pres-
sure line.
2.
Close the equalizing valve.
3.
Open the shut-off valve in the high-pres-
sure line.
8.4 Checking the measuring
range (span)
Upon delivery, the device is calibrated with
a linear characteristic based on the upper
measuring range value of the dp cell.
After entering the tank and gas data, the de-
vice 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) proportional to the tank
content.
In the same way, the device calculates the
max. possible differential pressure ∆p100
in
mbar
for the gas type and the predefined
reference height (total height or gauge pipe).
At Δp100, the output signal must be 20 mA.
To check the span, connect the device as
shown in Fig. 6.
When checking the span, activate the gas
with the highest density.
The values for gases with a lower density are
calibrated during this process as well.
To calibrate the currently used gas, its read-
ing must be at least 85 % of the adjusted up
-
per measuring range value
∆
p100.
Calibration of the span is subject to particu
-
lar protection (switch
3
) to prevent the span
from being changed unintentionally due to
improper operation of the keys.
Checking the measuring range (span)
Press the key five times. In display mode, the
value for the maximum differential pressure
Δp100 is indicated.
Check zero as described in section 8.3.
Press the key five times.
Display: Δp 100 = X.XXX (x1000) mbar.
−
Use a precision regulator to apply a test
pressure corresponding to the max. dif-
ferential pressure Δp100 while monitor-
ing the pressure gauge.
Set points: Δp = 0 mbar = 4 mA (see note
on gas column correction on page 25).
∆p100 = XXXX mbar = 20 mA.
When the reading and output signal do not
match the indicated Δ p100 value, readjust
the upper range value (span).
Adjusting the measuring range (span)
−
Check zero as described in section 8.3
on page 25.
−
Deactivate write protection and span
protection by setting switch
4
and switch
3
to
OFF
.
Press the key five times.
Note
Note
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