GE Masoneilan 12420 - Page 60

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Message on
LCD / ValVue
(English))
Description Probable Cause Recommended Action
VOLTAGE HART
®
LOW
HART voltage below threshold Internal voltage may have changed Clear the condition using ValVue
software or HART host
If the failure persists, replace the
device
VOLTAGE HART
®
HIGH
HART voltage above threshold Internal voltage may have changed Clear the condition using ValVue
software or HART host
If the failure persists, replace the
device
VOLTAGE CORE
LOW
Core (CPU) voltage below threshold Internal voltage may have changed Clear the condition using ValVue
software or HART host
If the failure persists, replace the
device
VOLTAGE CORE
HIGH
Core (CPU) voltage above threshold Internal voltage may have changed Clear the condition using ValVue
software or HART host
If the failure persists, replace the
device
LEVEL RANGE
Specific Gravity recalculated range
exceeded the linearization table limits
Specific Gravity value(s) is(are) incorrect or
bad calibration
Check Specific Gravity data or
instrument calibration
LEVEL CLAMP
Internal position or adjusted position is
outside the range of +/- 200%
Bad calibration or mechanical hardware
adjustment
Check displacer and torque tube S/A
characteristics
Redo calibration
SG LEVEL MAX
Absolute value of Specific Gravity
recalculated range is too small
Specific Gravity value(s) is(are) incorrect Check Specific Gravity data
SENSOR SUPPLY
VOLTAGE
Sensor supply voltage was outside sensor
specification
Lack of supply power or circuit board
component failure
Clear the condition using ValVue
software or HART host
Check supply power
If the failure persists, replace the
device
SENSOR OFF
Sensor turned off because of too low
analog current during 5 seconds
Lack of supply power or circuit board
component failure
Clear the condition using ValVue
software or HART host
Check supply power
If the failure persists, replace the
device
LEVEL FAILURE,
OUT OF RANGE
Level value is critically out of range (above
105% or below -5%) for a predefined time
(10 to 1000 seconds).
Bad calibration or mechanical hardware
adjustment
Check displacer and torque tube S/A
characteristics
Redo calibration
SENSOR OUT OF
RANGE (SIL)
Level value is critically out of normal range
which includes limits of full linearization
table range
Bad calibration or mechanical hardware
adjustment
Check displacer and torque tube S/A
characteristics
Redo calibration
4-20 LOOP
OUTPUT FAILURE
(SIL)
Mismatch between commanded and read
4-20 mA loop output (lower than 0.64 mA)
Resistance change of external loop may
have changed
Perform an instrument reset or
switch off then switch on.
If the failure persists, replace the
device