Alnor HM680, Owner'S Manual, Page: 25 / 40

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Chapter 6. Calculations Menu
The HM680 Hydronic Manometer is capable of performing a variety of calculations useful in evaluating
hydronic system performance. The Calculations Menu is accessed by pressing the
CALC
key from either
the Pressure or Flow Measurement screens.
Figure 7: Calculations Menu
Brake Power
This Calculations Menu option allows for determination of pump brake power.
Figure 8: Brake Power Screen
Inputs
The following inputs are necessary for calculating brake power. 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.
Flow
The pump flow rate.
dP
The pressure drop measured across the pump.
Flow
Differential
Pressure
Pump Efficiency
Pump Brake
Power
Battery Status or
Power Input Type