Eletta TIVG-100F, Руководство пользователя, Страница: 13 / 28

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3.3 Adjustment of switch point
All the Indicating units on Eletta Flow Monitors are tested and calibrated
according to the customers’ orders before shipping. If the customer does not
specify a desired switch point for the flow alarm, the TIVG-S25 Monitor’s
micro switches are preset to trip at the min- and max flow value. For the
TIVG-V15 the
micro switch is preset to trip at 50% (decreasing flow) of the
ordered max flow value, for example a 10 - 20 l/min flow range would have the
switch set to trip at 15 l/min, decreasing flow.
Please note!! We have calibrated each Indicating unit of the Flow Monitor in
our flow rig and set the switches according to the Flow values we achieve in
the rig under good conditions. We must stress that under actual field
conditions, the flow profile can be different from the one in our flow rig
depending on valves, hoses, bends or other obstructions and therefore the
switching can be off from our preset values. There is a possibility to adjust the
switch/alarm points in the field by adjusting the micro switches’ position me-
chanically.
For TIVG-S25
: To readjust, remove the two screws that hold the cover at the
top of the blue housing. The two adjusting dials are then visible through the
opening. Underneath the removed cover, you will find a small tool necessary
to use in order to change the adjusting dials position.
The adjusting dials are marked the same as the scale in the front and this mar-
king can be used to approximately find the right switch/alarm point for the ac-
tual application. Put the tool inside the drilled hole on the top of the adjusting
dial and gently move the dial sideways to the desired position. If the two ad-
justing dials are set to the same position, the micro switches will trip at the
same time. If possible, use the left adjusting dial for the high flow alarm (hig-
her end of the scale) and the right for the min. flow alarm (the lower end of the
scale), in order to get the best accuracy. If you use the alarms the other way
around, the spring mechanism inside the diaphragm housing will be affected
with lower accuracy as a result, so please try to avoid that. Repeat the
procedure for the next adjusting dial and then put the tool back in its bracket at
the cover.
Figure 7