Fluid Components International GF90_GF92 - Manual (Page 42)

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GF Series Flow Meter Models GF90/GF92 38 Doc. No. 06EN003229 Rev. H
Setting the Relays
There are two double pole, double throw relays on the flowmeter. They can be set to respond to
changing flow rates or changing temperatures.
There are four types of switching schemes to choose from. These are referred to as Above, Below,
Outside, and Inside. Each switch point can be set to have hysteresis and a time delay. Figure 22
illustrates the four switch point schemes with arbitrary hysteresis assigned.
Switching schemes, Above and Below change relay states when the flow or temperature crosses the
switch point value. The outside and inside schemes contain a range wherein the relay changes states.
Above
OFF
ON
Below
OFF
ON
Outside
ON OFF
Inside
ON OFF
Switch point
Deactivation
}
Hysterisis
C00225-2
Flow
or
Temperature
Figure 22. Relay Switch Point Schemes
To set the relays:
1. From the Main menu press 2. The 2.0 PORT SETUP menu title will appear.
2. Press 2, the Relay Setup option.
3. Press 1 or 2, corresponding to the relay to be set.
4. After entering the user password (if it is enabled), press 1, Unit, to select the switching
parameter. Press 1 to switch on flow rate or press 2 to switch on temperature. (The current
selection is shown in parenthesis to the left of the question mark.)
5. Press 2, Activate On, to select the switching scheme desired (See Figure 22). Press 1 for an
Above, press 2 for Below, press 3 for Inside or press 4 for Outside. Depending on the choice
made, enter 1 or 2 switch point values. For example, if Inside has been chosen, the user will
then be prompted to enter a low range switch point and a high range switch point. The values
entered must be within the displayed allowable range.
6. Press 3 to change the switch delay. Delay pauses the change in relay state when a switch
point is crossed. The value entered is approximately equal to seconds.
7. Press 4 to change the dead band or hysteresis of the switch point (See Figure 22). The dead
band or hysteresis has a value of flow rate or temperature depending on whether switch on
changes in flow rate or temperature have been chosen.
8. Press 5 to save and exit to the previous menu level. Press Y when asked to save permanently.