Endress+Hauser Deltabar PMD75B HART, Руководство пользователя

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Commissioning Deltabar PMD75B HART
42 Hauser
Low flow cut off (square root extraction)
In the lower measuring range, small flow quantities (creepages) can lead to large
fluctuations in the measured value. The measured value fluctuation can be suppressed
with the P - Transfer function parameter Square option.
Prerequisites:
• Measured variable with square root extraction in relation to pressure
• Due to the orientation of the measuring 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
• Set the transfer function to square root extraction
In the P - Transfer function parameter, set Square option.
Menu path: Application → Sensor → Sensor configuration → P - Transfer function
• Enter the switch-on point for low flow cut off in the Low cutoff parameter (default 5 %)
Menu path:Application → Sensor → Sensor configuration → Low cutoff
6%
5%
0% 0%
Q
Qmax
Q
Qmax
∆ ∆ p p
A0025191
• The hysteresis between the switch-on point and the switch-off point is always 1 % of the
maximum flow value
• If a switch-on point of 0 % is entered, low flow cut off is deactivated
In the
Assign PV parameter, the Pressure option must be set (factory setting)
Menu path: Application → Scaled Variable → Assign PV
9.7.4 Commissioning using the Commissioning Wizard
A Wizard is provided in FieldCare, DeviceCare
1)
, SmartBlue and the display that guides the
user through the initial commissioning process.
1. Connect the device with FieldCare or DeviceCare.
2. Open the device in FieldCare or DeviceCare.
 The dashboard (homepage) of the device is displayed:
3. In Guidance menu, click Commissioning wizard to launch the Wizard.
4. Enter the appropriate value in each parameter or select the appropriate option. These
values are written directly to the device.
5. Click "Next" to go to the next page.
6. Once all the pages have been completed, click "Finish" to close the Wizard.
If you cancel the Wizard before all the necessary parameters have been entered, the
device may be in an undefined state. In such situations, it is advisable to reset the
device to the factory default settings.
1) DeviceCare is available for download at www.software-products.endress.com. To download the software, it is necessary to register in the Endress
+Hauser software portal.