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IntelliPoint RF RML Series
3.3.4 Recalibration
AFTER STEPS
A-B-C, TURN
PRELOAD COUNT
FROM FULL
CCW, COUNT CW
PRELOAD TURNS
FULL CW
3.3.4 Recalibration (Continued)
If amount of preloading was recorded at time of initial
calibration, it is possible to replace instrument without
experimentally determining proper amount of preload.
A. For recalibration using procedure in Section 3.3.2, follow
Steps a, b, and c, then turn adjustor further clockwise
(cw) amount of preload.
B. For recalibration using procedure in Section 3.3.3, turn
adjustor clockwise (cw), from full counter-clockwise (ccw)
position, by amount of preload.
C. When recalibrating for bare sensing elements in
conductive materials (factory set), turn tuning
adjustor to full clockwise (cw) position. No other
adjustment is necessary. (Minimum of 25 turns.)
Nonvolatile Memory
The IntelliPoint has nonvolatile memory which allows the unit
to re-start after power outages without recalibrating.
When The IntelliPoint is powered for the first time the internal
microprocessor records and stores the "Air" value.
This is the uncovered value of the sensor mounted in the vessel.
The IntelliPoint will also store the last covered value and the
last uncovered value.
Whenever The IntelliPoint is powered it uses these values as
a reference point to determine its current condition (normal or
alarm).
The IntelliPoint has nonvolatile memory which retains the
recorded values even if power is lost for months. When
The IntelliPoint regains power after a power outage, the
microprocessor compares the stored values to the current
measured value. It will then determine its current status
based on this.
Example:
Air value is 10pF
covered value is 20pF
Uncovered value is 11pF
Setpoint = Alarm or recovery value.
For alarm this would typically be 2pF above the last uncovered
value (13pF in this case). For recovery this would be halfway
between the uncovered and covered value (15.5pF in this case).
The setpoint is stored in memory to indicate the last status of
the switch.
So, when the unit regains power the microprocessor reads the
current value of the sensor and determines the status based on
the stored values. It will only re-calibrate if the re-call button
is pressed.
18
Calibration
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