TSI Instruments HM685, Owner'S Manual

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5-8 Hydronic Manometer Model HM685
Output
The calculated valve flow coefficient ( Cv or Kv ) automatically updates 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 3, Flow Setup ).
P u m p L a w I m p e l l e r D i a m e t e r
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.
Actual Flow
Actual Impeller
Diameter
Desired Flow
Required Impeller
Diameter
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 Flow Measurement
screen (with the exception of impeller diameter).
Flow1 The actual system flow rate.