PD8-6262 Explosion-Proof Dual Analog Input Flow Rate/Totalizer
Instruction Manual
38
Input Calibration Method (
InCAL
)
There are two methods of calibrating (or scaling) the
display for each input channel to show the correct
engineering units.
•
Use the
Scale
menu to enter the scaling without a
signal source.
•
Use the
Calibrate
menu to apply a signal from a
signal source.
Note:
The Scale and Calibrate functions are exclusive of
each other. The totalizer uses the last function programmed.
Only one of these methods can be employed at a time. The
Scale and Calibrate functions can use up to 32 points
(default is 2). The number of points should be set in the
Advanced menu prior to scaling and calibration of the
totalizer. See
) menu on
for details.
Scaling the Totalizer without a
Signal Source (
SCAL-A
,
SCAL-B
)
The process inputs (4-20 mA,
10 VDC) can be
scaled to display the process variables in engineering
units. A signal source is not needed to scale the
totalizer; simply program the inputs and
corresponding display values.
From the
INCAL
menu, select channel A or B,
followed by
SCal-A
or
SCal-B
, and then set the input
signal value and display value for each of the scaling
points (default is two).
Scaling the Totalizer for Channel
A (
SCal-A
)
Scaling the Totalizer for Channel
B (
SCal-B
)
For instructions on how to program numeric
, page
Error Message (
Error
)
An error message indicates that the calibration or
scaling process was not successful.
After the error message is displayed, the totalizer
reverts to input 2 during calibration or scaling and to
input 1 during internal calibration, allowing the
appropriate input signal to be applied or programmed.
The error message might be caused by any of the
following conditions:
1. Input signal is not connected to the proper
terminals or it is connected backwards.
2. Wrong signal selection in
Setup
menu.
3. Minimum input span requirements not
maintained.
4. Input 1 signal inadvertently applied to calibrate
input 2.
Minimum Input Span
The minimum input span is the minimum difference
between input 1 and input 2 signals required to complete
the calibration or scaling of the totalizer.
Input Range
Input 1 & Input 2 Span
4-20 mA
0.15 mA
10 VDC
0.10 VDC
•
Reverse Scaling
The controller can be scaled so that 4 mA
represents the high end of the process value
range being measured by the transmitter and
20 mA represents the low end of the process
value range.
