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| Process error alarm |
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| LCD display | Description | Corrective action |
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| The measured value is above the | The setting range for measured value |
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| 125% of the span. | is narrow or the flow rate is | ||
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| OVER 125% |
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| check that there is no problem in the | ||
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| The measured value is below the | The setting range of measured value |
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| −125% of the span | is narrow or the flow rate is | ||
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| UNDER |
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Fluid empty alarm
Detects that the fluid in the measuring pipe of the detector is empty and an alarm will be displayed.
If the alarm is set to OFF, this function does not work. For how to set this function, see 8.2 “Parameter Check/Change.”
(Note: In the case of LF232*F; Fluid empty alarm function is not usable. Set this function 'OFF'.)
LCD display | Description | Corrective action | |
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EMPTY | Fluid is not filled in the measuring | Take measures to fill the pipe with | |
pipe of the detector. | fluid. | ||
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Precautionary notes when using the fluid empty alarm
(1)Since the fluid empty alarm is detected using the impedance between the signal wires connected to a pair of electrodes in the detector as well as the input signal level, a false alarm may be detected by the following factors:
•Signal wire is broken or loose connection exists
•A large amount of air bubbles are mixed in the fluid
•Insulating materials are accumulated on the electrode
(2)In an environment where grounding is incomplete or excessive noise enters from the outside, the fluid empty alarm may not work correctly.
In addition, under the condition like this, reliability of flow measurement itself decreases. Take necessary measures to prevent the entry of noise such as making the ground complete (independent Class D ground with grounding resistance 100Ω or less) or reviewing the cable wiring route.
(3)If the fluid still remains in the measuring pipe or deposits of conductive materials remain in the measuring pipe, the impedance between the signal wires does not increase and the fluid empty alarm may not work. In this case, use other method (such as a pump stop signal or a signal from valves) to check the fluid empty condition.
