Deltabar PMD78B HART
Commissioning
Hauser
53
9.6.5
Commissioning without the commissioning wizard
Example: Commissioning a volume measurement in the tank
Pressure and temperature units are converted automatically. Other units are not
converted.
In the following example, the volume in a tank should be measured in liters. The
maximum volume of 1
000 l (264 gal) corresponds to a pressure of 450 mbar (6.75 psi).
The minimum volume of 0 liters corresponds to a pressure of 50 mbar (0.75 psi).
Prerequisites:
• Measured variable in direct proportion to the pressure
• Due to the orientation of the device, there may be pressure shifts in the measured value
(when the vessel is empty or partly filled, the measured value is not zero)
Perform position adjustment if necessary
–
+
+ -
50
p
[mbar]
450
V
[l]
1000
0
B
450 mbar
1000 l
A
50 mbar
0 l
A0039101
A
"Pressure value 1" parameter and "Scaled variable value 1" parameter
B
"Pressure value 2" parameter and "Scaled variable value 2" parameter
The pressure present is displayed in the operating tool on the same settings page in
the "Pressure" field.
1. Enter the pressure value for the lower calibration point via the
Pressure value 1
parameter: 50 mbar (0.75 psi)
Menu path: Application → Sensor → Scaled variable → Pressure value 1
2. Enter the volume value for the lower calibration point via the
Scaled variable value
1
parameter: 0 l (0 gal)
Menu path: Application → Sensor → Scaled variable → Scaled variable value 1
3. Enter the pressure value for the upper calibration point via the
Pressure value 2
parameter: 450 mbar (6.75 psi)
Menu path: Application → Sensor → Scaled variable → Pressure value 2
4. Enter the volume value for the upper calibration point via the
Scaled variable value
2
parameter: 1
000 l (264 gal)
Menu path: Application → Sensor → Scaled variable → Scaled variable value 2
Result: The measuring range is set for 0 to 1
000 l (0 to 264 gal). Only the
Scaled variable
value 1
parameter and
Scaled variable value 2
parameter are set with this setting. This
setting has no effect on the current output.
Low flow cut off (square root extraction)
With the
Low cutoff
parameter, positive zero return can be configured in the lower
measuring range.
