Thermo Scientific DCT6088, User Manual

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Primary Displays & Menus
The Calibration Menu
Within the Calibration menu is the Calibration Group menu (50). This
menu contains four setup menus: Zero Set, Scale, SS Comp, and Date
(menus 51 through 54).
The Calibration
Menu
Figure 5–37. Calibr menu
Zero Set Calibration
An important step in assuring accurate flow measurement is the proper
calibration of the instrument and the installation. The calibration methods
must be performed for the particular pipe that is to be metered. The
following table provides guidelines for selecting a calibration method.
Table 5–2. Calibration methods
Calibration Method Function Application
Zero flow set (zero set
calibration) Zeroes the instrument for an
actual no flow condition. Installations where flow can be
stopped.
Manual zero set (zero
set calibration) Applies a manually entered
offset to all flow readings. Where an offset is required.
Scale Factor Compensates for manufacturing
variations in the transducers. Set by the factory to the value
imprinted on the transducers.
After installing the meter, you may find that a small adjustment to the zero
point (zero set calibration) is required. Zero set calibration enables the
meter to read very close to zero under zero flow conditions. There are two
zero set calibration methods: the zero flow set method and the manual zero
set method. View the zero point used by the flowmeter in either of these
methods by selecting
Manual in menu 51.
After the instrument is properly zeroed, it should display a stable reading
well below 0.05 ft/s (0.015 m/s) under zero flow conditions with the low
flow cutoff disabled.
Prior to performing a zero set calibration, verify the following:
●
Transducers are connected to the pipe.
●
Instrument is reading flow.
●
Low flow cutoff is disabled to allow verification of calibration.
Thermo Fisher Scientific DCT6088 User Guide 5-13