TSI Instruments HM685, Owner'S Manual

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2-10 Hydronic Manometer Model HM685
P e r f o r m i n g F l o w M e a s u r e m e n t s
The HM685 Hydronic Manometer allows for continuous calculation and
display of flow. While in the Flow Measurement screen, the manometer
makes and displays continuous pressure measurements, calculates and
displays continuous flow readings, and allows for discrete data storage to
the memory.
Note: The Cv (Kv) value of the measured valve must be known in order
to obtain meaningful flow readings .
Accessing the Flow Measurement Screen
The Flow Measurement screen is accessed by pressing the FLOW key
from the Pressure Measurement screen.
Flow Measurement Screen
Temperature
Current
Test ID
Current Cv (Kv)
Factor Name
Differential
Pressure
Battery Status or
Power Input Type Cv/Kv Value
*Shown with two optional accessory temperature probes attached.
Flow The flow reading is indicated as Flow on the manometer
display. It represents a calculated value determined from the
measured Differential pressure and user entered values for
the valve flow coefficient (Cv or Kv) and fluid specific gravity.
Cv/Kv The valve flow coefficient is indicated as Cv (Kv) on the
manometer display.
Notes:

The Cv (Kv) value of the measured valve must be known
in order to obtain meaningful flow readings.

100 different Cv (Kv) names and values can be stored in
the instrument (Reference Chapter 3, Flow Setup ).

The Cv (Kv) value can be temporarily edited within the
Flow Measurement screen by pressing the
▲ or ▼ key to
enter an edit mode. Use the
▲ or ▼ keys to change the
value. Press ESC to leave the edit mode. See Chapter 3,
Flow Setup, Temporary Adjustments to the Cv (Kv) Value .