Alnor HM680, Руководство пользователя, Страница: 26 / 40

20 HM680 Hydronic Manometer
Note:
The pressure drop across the pump can be entered as a real-time measurement. With the
value for differential pressure highlighted, press the
READ
key. The field will begin
updating with measured values of differential pressure. Press the
READ
key again to
discontinue real-time updates.
Eff
The pump efficiency (as a percent).
Notes:
The pump efficiency should be provided by the manufacturer.
If the pump efficiency is not known, allowing for an efficiency factor of 70 % is a good
rule-of-thumb.
Output
The calculated pump brake power ( BP ) will automatically update as the input parameters are
changed. Using the ▲ and ▼ keys to scroll, and the ◄ and ► keys to change the selected field, the
unit of measure for brake power may be adjusted. Available units for brake power are: bhp, W, and
kW.
Heat Flow
This Calculations Menu option allows for determination of heat flow.
Figure 9: Heat Flow Screen
Inputs
The following inputs are necessary for calculating heat flow. 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 specific heat).
Temp1
The upstream fluid temperature of the device being measured.
Note:
The upstream temperature can be entered as a real-time measurement if the accessory
temperature probe is connected. With the value for the upstream temperature
highlighted, press the
READ
key. The field will begin updating with measured values of
temperature. Press the
READ
key again to discontinue real-time updates.
Upstream
Temperature
Downstream
Temperature
Flow
Specific Heat
Battery Status or
Power Input Type Heat Flow