Fluid Components International GF90_GF92 - Manual (Page 53)

Doc. No. 06EN003229 Rev. H 49 GF Series Flow Meter Models GF90/GF92
FLUID COMPONENTS INTERNATIONAL LLC http://www.fluidcomponents.com
To determine if the flowmeter is set to use the Multiple Groups:
From the Main menu press 1. The flowmeter will enter the normal mode of operation. If the mode on the
last line of the window (see Figure 16) is Auto, or Link then the flowmeter contains multiple calibration
groups.
If the mode is normal or Norm is displayed in the normal operation window, the flowmeter may still
contain multiple calibration groups.
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.
3. Press 1 again, the Set Group option. Enter the user password (if it is enabled).
4. Press 2, to change the current group to Group 2.
5. 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.
6. Change the current group in Set Group back to group 1.
Switching Groups Through the Keypad
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.
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.
Switching Groups Through the Serial Port
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 31A for an serial communication example.)
Switching Groups by Temperature - Auto-Selecting
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 32.