Operation and Service Manual 7
The telescoping probe contains the velocity, temperature, and
humidity sensors. When using the probe, make sure the
sensor window is fully exposed and the orientation dimple is
facing upstream.
For temperature and humidity measurements, make sure that at
least 3 in. (7.5 cm) of the probe is in the flow to allow the
temperature and humidity sensors to be in the air stream.
Extending the Probe
To extend the probe, hold the handle in one hand while pulling on the
probe tip with the other hand. DO NOT hold the cable while extending
the probe as this prevents the probe from extending.
Retracting the Probe
To retract the probe, hold the handle in one hand while gently pulling
the probe cable until the smallest antenna section is retracted.
W A R N I N G
DO NOT use the instrument or probes near hazardous voltage
sources since serious injury could result.
Differential Pressure Capable Models
(9630, 9650 and 9650-NB)
The 9630, 9650, and 9650-NB include pressure ports that can be
used to measure static and differential pressures in ductwork. For
more information, see Application Note TSI-107.
Negative (-) Pressure Port
Positive (+) Pressure Port
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