TSI Instruments HM685, Owner'S Manual

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Getting Started 2-11
Continuous Flow Measurements
The HM685 Hydronic Manometer continuously measures and displays flow
readings whenever the manometer is in the 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. See
Chapter 4, Data Logging , for
more details on setup.
Discrete Flow Measurements
Taking a flow 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 or flow 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.
P e r f o r m i n g T e m p e r a t u r e M e a s u r e m e n t s
The HM685 Hydronic Manometer accessory temperature probe is a
1/8”
diameter, stainless steel sheathed immersion probe designed for
measurement of water line temperatures. When using the accessory
temperature probe, the HM685 Hydronic Manometer is equipped to make
and display continuous temperature measurements in both the Pressure
and Flow Measurement screens. Two temperature probes can be
connected to the instrument to measure upstream and downstream
temperature simultaneously.
Connecting the Temperature Probe
Connect the keyed 3-pin plug of the accessory temperature probe to the
mating connector located on the right-hand side of the manometer.
Note: A locking nut is provided on the accessory temperature probe plug
to allow for a more secure attachment when connecting to the
manometer.