FMON10JEN 07.04.2017 Rev. 10J
21 (21)
LEDs in flow meters
Each flow meter has five LEDs which indicate the oil flow rate in relation to the set nominal flow rate and alarm
limits. Refer to the section 9 Settings. The accepted flow rate range is indicated with three green LEDs. When
the LED in the middle is lit, flow rate is close to the set nominal flow rate. The flow rate is in the pre-alarm
range, when upper or lower green LED is lit. The pre-alarm limit is set as a percentage from the subtraction of
nominal value and alarm limit. Default value for the pre-alarm limit is 40% (table 1).
When the flow rate goes below the low alarm limit value, a red LED is lit. When the flow rate exceeds the high
alarm limit value, a yellow LED is lit.
Table 1 Flowmeter LEDs
Flow rate LED Description
> Set high alarm limit
(yellow)
Alarm, High
>40% of Set high alarm limit-Set nominal flow
(upper green)
Pre-alarm, High
<40% of Set high alarm limit-Set nominal flow
>40% of Set nominal flow- Set low alarm limit
(middle green)
Nominal flow
<40% of Set nominal flow- Set low alarm limit
(lower green)
Pre-alarm, Low
< Set low alarm limit
(red)
Alarm, Low
Nominal flow rate does not necessarily have to be in the middle of high/low alarm limits. The
difference between the nominal and the low limit flow rate can be unequal to the difference
between the nominal and high limit flow rate.
The percentage is adjustable by parameter PrS. See section 9.5.4 Pre-alarm limit.
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