TSI Instruments HM685, Owner'S Manual

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Getting Started 2-9
High-Side Gauge Pressure The High-side gauge pressure
measurement is indicated as
High on the
manometer display. The gauge pressure
readings can be positive or negative values
in the range of -20 to 300 psi (-138 to
2068 kPa).
Low-Side Gauge Pressure The Low-side gauge pressure reading is
indicated as
Low on the manometer
display. It represents a calculated value
determined from the measured High-side
gauge and Differential pressure as follows:
Low P = High P
– dP
Differential Pressure The Differential pressure measurement is
indicated as
dP on the manometer display.
The differential pressure readings can be
positive or negative values in the range of
±300 psi (±2068 kPa).
Continuous Pressure Measurements
The HM685 Hydronic Manometer continuously measures and displays
pressure readings whenever the manometer is in the Pressure
Measurement or Flow Measurement screen, with the exception of when
the
READ key is pressed. When the READ key is pressed, the displayed
readings are averaged measurements taken over the sampling period as
defined by the Log Mode and Log Settings
. The display is updated once
per second.
Discrete Pressure Measurements
Taking a discrete pressure measurement allows for measurement and
display of a single time-averaged reading taken over the sampling period
as defined by the Log Mode and Log Settings. Discrete pressure
measurement values are displayed on-screen for a period of 4 seconds
and then returns to continuous measurement mode. See
Chapter 4, Data
Logging , for more details on setup.
1. Press the READ key.
2. Allow the manometer to stand undisturbed until the reading is
complete.