Precision Digital Corporation ProtEX-MAX PD8-6300, Инструкция по эксплуатации

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PD8-6300 Pulse Input Rate/Totalizer, Counter & Tachometer
Instruction Manual
38
K-Factor Calibration (
Factor
)
The meter may be calibrated using the K-Factor
function. Most flowmeter manufacturers provide this
information with the device. Enter the
K-Factor
(
Factor
) menu and select the decimal point with
highest resolution possible and program the k-factor
value (
i.e. pulses/gal). The meter will automatically
calculate the flow rate using the k-factor and the time
base selected.
Multi-Point Calibration & Scaling
The meter is set up at the factory for 2-point linear
calibration. The number of points for multi-point
calibration/scaling is set up in the
Advanced Features
menu. Up to 32 linearization points may be selected.
See Multi-Point Linearization (
Linear
) menu on page
52 for details.
Scaling the Meter (
SCALE
)
The pulse inputs can be scaled to display the process
variable in engineering units.
A signal source is not needed to scale the meter;
simply program the inputs and corresponding display
values.
Note: The display values (
DiS 1
and
DiS 2
) need to be in
units of measure per second. For example, if the rate at
1000 Hz is 13.20 gal/min, this must be converted to gal/sec.
In this scenario, the numbers input into the
SCALE
menu
would be as follows:
InP 1
: 0.0
DiS 1
: 0.00
InP 2
: 1000.0
DiS 2
: 0.22
Set the time base to minutes (see
Time Base, Total
Conversion Factor & Total Reset ) and the meter will
display 13.20 gal/min at 1000 Hz.
For instructions on how to program numeric values
see
Setting Numeric Values on page 35 .
Error Message (
Error
)
An error message indicates that the calibration or scaling
process was not successful. After the error message is
displayed, the meter reverts to input 2 during
calibration or scaling, 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. Minimum input span requirements not
maintained.
3. Input 1 signal inadvertently applied to calibrate
input 2*.
*Not relevant when scaling the meter.
For instructions on how to program numeric values
see
Setting Numeric Values on page 35 .
Minimum Input Span
The minimum allowed input span is 0.10 Hz, which is
the minimum difference between input 1 and input 2
signals required to complete the calibration or scaling
of the meter.
Time Base, Total Conversion Factor
& Total Reset
The time base, total conversion factor, and total reset
menus are located in the
Program menu.
The total and grand total have their own independent
settings. This means that one can be displaying the
value in gallons while the other displays in million
gallons, liters, m
3
, etc.