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IntelliPoint RF RML Series
Section 3: Calibration
3.1
Setpoint Control
CLOCKWISE WILL RAISE
OPERATING LEVEL
25 TURN
COUNTER-CLOCKWISE
WILL LOWER OPERATING
LEVEL
Figure 3-1
Set point Adjustment
3.2
Adjustable Differential Controls
DIFFERENTIAL
SP
CLOCKWISE WILL RAISE
DIFFERENTIAL
25 TURN
COUNTER-CLOCKWISE
WILL LOWER
DIFFERENTIAL
Figure 3-2
Differential Adjustment
3.3
Calibration Procedures
WARNING:
Before removing the explosion-proof housing cover in a
potentially hazardous area, make certain that the area
is safe. When calibration is complete, the cover must be
replaced. Each conduit from the explosion-proof case must be
equipped with an approved seal fitting.
There is a single adjustment located on top of the instrument
that controls the point at which the relay operates. A red
LED indicates that relay is de-energized.
Each revolution of the control changes the operating point
approximately 4 pF. (For high-sensitivity models, each
revolution will change operating point approximately 1 pF.)
Turning adjustment clockwise will raise level at which relay
operates, turning it counterclockwise will lower level at
which relay operates. Refer to Figure 2-5 and Section 3.3.
Differential is the hysteresis (dead band), or change in level,
necessary to switch electronic unit from one state to another.
It is useful to prevent oscillation "chatter" on those occasions
when level happens to be right at switching point or when
surface is agitated.
RML Series level control with adjustable differential allows
user to determine amount of capacitance change (hence level)
between control point and recovery point. User can select two
points on a vertical sensing element where relay contacts will
open at one point and close at the other.
Range of operation is 3 to 100pF.
Low point range is that range of capacitance over which
lower switching point may be adjusted.
Differential range corresponds to differential in level on
sensing element and depends on both the capacitance of
the element itself and the properties of the material being
measured. See Figure 2-5 for location of adjustments. For
calibration of adjustable differential units, see Section 3.3.5
All RML Series controls with bare metal sensing elements
are factory-set to switch in all water-based conducting
materials. NO calibration adjustment is needed.
15
Calibration
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