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5.6.2 Combination with an Existing Detector (for Large Meter Size)
When the LF232 flowmeter converter (LF232*B for large meter size) is combined with an existing detector of
commercial power excitation method, the excitation current may not become stable because of the difference of the
excitation method.
(Example of symptoms)
• When the excitation current is checked in the CAL mode, the excitation current is not displayed exactly as set
for the converter.
• The indicated value of the excitation current does not stabilize in the CAL mode and the minimum digit cannot
be read.
• The zero point of flow rate at the time of still water measurement is not stable.
If this happens, connect an adjusting capacitor provided for the detector (only for large meter size) between the
terminals X and Y of the terminal block for converter cable as shown below.
This capacitor is not needed if you combine with a detector of square-wave excitation method (guideline date:
manufacture date is 1981 or later).
In addition, if the symptom does not improve when the capacitor is connected, stop using the capacitor.
Terminal block
Connect an attached
capacitor between the
terminals X and Y.
Note: If any symptom described above does not occur when connected
with an existing detector, do not connect this capacitor.
Figure 5.12 How to Connect an Adjusting Capacitor