Fluid Components International GF03 - Manual (Page 38)

FLUID COMPONENTS INTERNATIONAL LLC http://www.fluidcomponents.com
Model GF03 Flow Meter 3 4 Doc. No. 06EN003352 Rev. B
w To determine if the flowmeter is set to use the Multiple Groups in Normal
mode:
1. Press 4, the Miscellaneous option.
2. Press 1, the Set Group option.
2. Press 1 again, the Set Group option. Enter the user password (if it is enabled).
3. Press 2, to change the current group to Group 2.
4. Press HOME, 7, 3 and 8. Scroll the display to show C1 to C5. If the coefficients
C1 through C5 are non-zero values, the Flowmeter has been set to use multiple
groups.
5. Change the current group in Set Group back to group 1.
The current calibration group that the flowmeter uses can be changed from the keypad. This
may be the most desirable method of changing groups for a flowmeter that has been
configured for multiple installations.
w To change the current group from the keypad:
1. Press 4, the Set Group option.
2. Press 1, the Set Group option. Enter the user password (if it is enabled).
3. Enter the desired group number, 1, 2 or 3. The flowmeter is now set to use that group
of calibration information.
The current calibration group can be changed remotely through the serial port. The sequence
of commands sent through the serial port is equivalent to the sequence taken at the keypad.
The command string should include sufficient time delays to allow the flowmeter to respond.
One possible command string is "H H 4 1 1" + (desired group number) + "H 1". The command
string sends to HOME (H) characters, sets the menu level to 4.1.1, enters the desired group
number and returns the flowmeter to normal operation. Remember to insert a time delay after
sending each character. (See Figure 25 for an serial communication example.)
The flowmeter has the ability to switch groups on changes in process temperature or changes
in signal into the auxiliary port. To use the auto-select option, the flowmeter must be
configured by the factory. Use the procedure described in the section Multiple Groups to
determine if the flowmeter has been configured to use multiple groups. In Auto-Select mode
the user can program the flowmeter to switch on temperature. One temperature switch point
is used for switching between two groups and two switch points are used for three groups. The
switch points have a 2.5% hysteresis and cannot be changed. A typical application that would
benefit from using auto-selecting by temperature is described in Figure 26.
Switching Groups
Through the Keypad
Switching Groups
Through the Serial Port
Switching Groups by
Temperature - Auto
Selecting
FCI
Nitrogen Purge
@ 70°F
Check
Valve
Check
Valve Process Gas
@ 250 °F
C00252-1
Figure 26 - Auto Select by Temperature Application