CHAPTER 3 - OPERATION FLUID COMPONENTS INTL
Low Level Alarm Settings (Sensing Element Normally Wet)
For the low level fail safe setup the following jumpers are to be installed: J18, J20, J23, J24, J27.
WHEN ALARM 1 DETECTS LOW
LEVEL, THERE IS A POSSIBLE
5.0
OPEN ACTIVE RTD OR
DE-ENERGIZED
AIR
4.5
SHORTED REFERENCE RTD
ALARM 1
4.0
ALARM 2 DETECTS A
SET POINT
3.5
POSSIBLE HEATER FAILURE,
ENERGIZED
3.0
SHORTED ACTIVE RTD OR
SIGNAL
OPEN REFERENCE RTD
2.5
OUTPUT
2.0
A POWER FAILURE IS DETECTED IF
BOTH RELAYS ARE DE-ENERGIZED
1.5
LIQUID
1.0
0.5
ENERGIZED
ALARM 2
SET POINT
0
DE-ENERGIZED
MEDIA
C00534-2
Figure 3-7. Low Level Fail Safe Alarm
The following information is assumed:
Relay is de-energized in the ALARM condition.
Alarm 1 set point is adjusted for the mean value between the air and liquid signals.
Alarm 2 set point is adjusted to approximately half of the liquid signal. (A lower setting might be needed if the
liquid is moving.)
High Level Alarm Settings (Sensing Element Normally Dry)
For the high level fail safe setup the following jumpers are to be installed: J18, J20, J23, J25, J26.
DE-ENERGIZED
ALARM 2
SET POINT
WHEN ALARM 1 DETECTS HIGH
LEVEL, THERE IS A POSSIBLE
ENERGIZED
5.0
AIR
HEATER FAILURE,
4.5
SHORTED ACTIVE RTD OR
4.0
OPEN REFERENCE RTD
3.5
ALARM 2 DETECTS A POSSIBLE
SIGNAL
3.0
OPEN ACTIVE RTD OR SHORTED
OUTPUT
REFERENCE RTD
2.5
A POWER FAILURE IS DETECTED IF
2.0
BOTH RELAYS ARE DE-ENERGIZED
1.5
ENERGIZED
LIQUID
1.0
ALARM 1
0.5
SET POINT
0
DE-ENERGIZED
MEDIA
C00535-2
Figure 3-8. High Flow Fail Safe Alarm
The following information is assumed:
Relay is de-energized in the ALARM condition.
Alarm 1 set point is adjusted for the mean value between the air and liquid signals.
Alarm 2 set point is adjusted above maximum signal output for air (not to exceed 7.0 volts).
Doc. No. 06EN003246 Rev. B 3 - 21 FLTÔ Series FlexSwitchÔ
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