TSI Instruments HM685, Руководство пользователя

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2-6 Hydronic Manometer Model HM685
3. Follow the on-screen instruction to complete the gauge pressure
sensor zeroing process.
4. Allow the manometer to stand undisturbed for five (5) seconds until the
zero gauge pressure sensor function has completed.
Notes:

Zeroing the gauge pressure sensor requires the user to disconnect the
High pressure (red) hose; as such it is often most convenient to zero
the gauge pressure sensor as part of the start-up sequence (i.e.,
before hoses have been connected).

The zero offset of the gauge pressure sensor is sensitive to
temperature changes. If moving the manometer between areas of
extreme temperature difference, it is best to allow the meter to settle to
the new temperature prior to zeroing.
Zeroing the Differential Pressure Sensor
To ensure the most accurate differential pressure ( dP ) measurements and
calculated flow ( Flow ) values, the HM685 differential pressure sensor
should be zeroed prior to taking readings on each new system. The
differential pressure sensor is zeroed as follows:
1. Go to the Measurement Screen .
2. Turn the valve handle on the manometer to the BYPASS position.
3. The instrument will automatically zero the differential pressure sensor.
Follow the on-screen instructions and return the knob to MEASURE
once this is done.
Notes:

Any pressures applied to the hoses will not affect the dP zeroing
function. This feature allows for successful zeroing of the differential
pressure sensor while maintaining connections to the system under
test.

Zeroing of the differential pressure sensor is initiated any time the
valve handle has been turned to the
BYPASS position while in the
Pressure or Flow Measurement screens. This feature allows for
successful zeroing of the differential pressure sensor while entrained
air is being purged from the hoses.

The zero offset of the differential pressure sensor is sensitive to
temperature changes. If moving the manometer between areas with
extreme temperature difference, it is best to allow the meter to settle to
the new temperature prior to zeroing.