Owner manual

CHAPTER 3 - OPERATION FLUID COMPONENTS INTL
Doc. No. 06EN003246 Rev. B 3 - 21 FLTÔ Series FlexSwitchÔ
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.
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.
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).
0.5
1.0
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
WHEN ALARM 1 DETECTS LOW
LEVEL, THERE IS A POSSIBLE
OPEN ACTIVE RTD OR
SHORTED REFERENCE RTD
ALARM 2 DETECTS A
POSSIBLE HEATER FAILURE,
SHORTED ACTIVE RTD OR
OPEN REFERENCE RTD
SIGNAL
OUTPUT
MEDIA
SET POINT
ALARM 2
DE-ENERGIZED
DE-ENERGIZED
ENERGIZED
ENERGIZED
C00534-2
ALARM 1
SET POINT
AIR
LIQUID
A POWER FAILURE IS DETECTED IF
BOTH RELAYS ARE DE-ENERGIZED
0.5
1.0
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
ALARM 2 DETECTS A POSSIBLE
OPEN ACTIVE RTD OR SHORTED
REFERENCE RTD
WHEN ALARM 1 DETECTS HIGH
LEVEL, THERE IS A POSSIBLE
HEATER FAILURE,
SHORTED ACTIVE RTD OR
OPEN REFERENCE RTD
SIGNAL
OUTPUT
MEDIA
SET POINT
SET POINT
DE-ENERGIZED
DE-ENERGIZED
ENERGIZED
ENERGIZED
C00535-2
AIR
LIQUID
ALARM 1
ALARM 2
A POWER FAILURE IS DETECTED IF
BOTH RELAYS ARE DE-ENERGIZED