Deltabar PMD78B HART Commissioning
Endress+Hauser 25
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.
Prerequisites:
• Measured variable with square root extraction in relation to pressure
• In the Output current transfer function parameter, set the Square option.
Menu path: Application → Sensor → Sensor configuration → Output current transfer
function
• Enter the switch-on point for the 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 0 % is entered for the switch-on point, low flow cut off is disabled
In the Assign PV parameter, the Pressure option must be selected (factory setting)
Menu path: Application → Sensor → Scaled variable → Assign PV
Alternative menu path: Application → HART output
The set unit is also output on the fieldbus.
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