Alnor HM680, Руководство пользователя, Страница: 28 / 40

22 HM680 Hydronic Manometer
field. Units for the inputs are driven by what was last set in the Pressure and Flow Measurement
screens.
dP
The pressure drop across the valve.
Flow
The flow rate through the valve.
SG
The specific gravity of the system fluid.
Output
The calculated valve flow coefficient ( Cv or Kv ) will automatically update as the input parameters
are changed.
Note:
Whether a
Cv
or
Kv
value is being calculated is dependent on the type (
Cv
or
Kv
) set for
the current selected valve flow coefficient (Reference Chapter 4).
Pump Law Impeller Diameter
This Calculations Menu option allows for determination of required pump impeller size. The calculation
is based upon the following affinity law: Flow varies directly as the change in impeller diameter.
Figure 11: Pump Law Impeller Diameter Screen
Inputs
The following inputs are necessary for calculating the required impeller diameter. Use the ▲ and ▼
keys to select the parameter to be updated, and the ◄ and ► keys to change the value of the
highlighted field. Units for the inputs are driven by what was last set in the Pressure and Flow
Measurement screens (with the exception of impeller diameter).
Flow1
The actual system flow rate.
Diam1
The actual pump impeller diameter.
Actual Flow
Actual Impeller
Diameter
Desired Flow
Battery Status or
Power Input Type
Required Impeller
Diameter