Alnor HM680, Owner'S Manual, Page: 27 / 40

Chapter 6. Calculations Menu 21
Temp2
The downstream fluid temperature of the device being measured.
Note:
The downstream temperature can be entered as a real-time measurement if the accessory
temperature probe is connected. With the value for the downstream 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.
Flow
The flow rate through the device.
Note:
The flow rate through the device can be entered as a real-time measurement. With the
value for flow highlighted, press the
READ
key. The field will begin updating with
calculated values of flow. Press the
READ
key again to discontinue real-time updates.
SpHeat
The specific heat of the system fluid.
Notes:
The unit of measure for specific heat is driven by that selected for heat flow as follows:
ƒ Heat flow in Btu/hr → specific heat in Btu/lb
‚
°F
ƒ Heat flow in W or kW → specific heat in kJ/kg
‚
°C
The default specific heat is that of water: 1.00 Btu/lb
‚
°F (4.19 kJ/kg
‚
°C)
Output
The calculated heat flow ( HF ) 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 heat flow may be adjusted. Available units for heat flow are: Btu/hr, W, and kW.
Cv/Kv
This Calculations Menu option allows for determination of a valve flow coefficient (
Cv
or
Kv
).
Figure 10: Cv/Kv Screen
Inputs
The following inputs are necessary for calculating the flow coefficient. Use the ▲ and ▼ keys to
select the parameter to be updated, and the ◄ and ► keys to change the value of the highlighted
Differential
Pressure
Flow
Specific Gravity
Battery Status or
Power Input Type
Flow Coefficient