Precision Digital Corporation Helios PD2-6363, Instruction Manual

Page: 34 / 60

Helios PD2-6363 Dual Pulse Input Rate/Totalizer
Instruction Manual
34
Scaling the Meter for Channel A
(
SCal-A
)
For instructions on how to program numeric values
see Setting Numeric Values , page 28 .
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 set to minutes (see
Total & Grand
Total Setup (
tsetup
) on page 35 ) and the meter will
display 13.20 gal/min at 1000 Hz
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 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. Minimum input span requirements not
maintained.
3. Input 1 signal inadvertently applied to calibrate
input 2.
Minimum Input Span
The minimum allowed input span is 1.0 Hz, which is
the minimum difference between input 1 and input 2
signals required to complete the calibration using an
external signal source, or 0.1 Hz for scaling the meter
without a signal source.
Calibrating the Meter with External
Source (
CAL-A
,
CAL-B
)
To scale the meter without a signal source, refer to
Scaling the Meter without a Signal Source (
SCAL-A
,
SCAL-B
), page 33 .
The meter can be calibrated to display the process
variables in engineering units by applying the
appropriate input signal and following the calibration
procedure.
The use of a calibrated signal source is strongly
recommended to calibrate the meter.
There is no need to warm up the meter before
performing calibration of the inputs.
Channel B is calibrated similarly to Channel A, shown
below.
Calibrating the Meter for Channel
A (
CAL-A
)
Note: The display values (
DiS 1
and
DiS 2
) need to
be in units of measure per second.
Note: Inputs for the above example are:
Input 1: 0.0 Hz; Display 1: 0.0 gallons/min
Input 2: 1000.0 Hz; Display 2: 6000.0 gallons/min