PD8-6262 Explosion-Proof Dual Analog Input Flow Rate/Totalizer
Instruction Manual
61
Internal Calibration (
ICAL
)
The totalizer is
factory calibrated
prior to
shipment for milliamps and volts with calibration
equipment that is certified to NIST standards.
The use of calibrated signal sources is necessary to
perform the internal calibration of the totalizer.
Check calibration of the totalizer at least every
12 months. Each input and input type must be
recalibrated separately.
Notes:
1.
If totalizer is in operation and it is intended to accept
only one input type (e.g. 4-20 mA), recalibration of other
input is not necessary.
2.
Allow the totalizer to warm up for at least 15 minutes
before performing the internal calibration procedure.
The
Internal
calibration
menu is part of the
Advanced
Features
menu.
1. Press and hold the Menu button for three
seconds to access the advanced features of the
totalizer.
2. Press the Up
arrow button to scroll to the
Internal
calibration
menu (
ICAL
) and press Enter.
3. Select channel A (
Ch-A
) or channel B (
Ch-b
) and
press enter.
4. The totalizer displays either current calibration
(
C CAL
) or voltage calibration (
V CAL
), according
to the input setup. Press Enter
to start the
calibration process.
Example of Internal Calibration for current
input:
5. The totalizer displays
low
input current message
(
C lo
). Apply the low input signal and press
Enter. The display flashes for a moment while the
totalizer is accepting the low input signal.
6. After the display stops flashing, a number is
displayed with the leftmost digit brighter than the
rest. The bright digit is the active digit that can be
changed by pressing the Up
arrow button. Press
the Right
arrow button to move to the next digit.
7. Set the display value to correspond to the input
signal being calibrated, typically 4.000 mA.
8. The display moves to the
high
input calibration
(
C Hi
). Apply the high input signal and press
Enter.
9. Set the display for the high input calibration, in
the same way as it was set for the low input
calibration, typically 20.000 mA.
The graphic above shows the calibration of the
current input. The voltage input is calibrated in a
similar way.
Tips:
•
Low and high input signals can be any valid
values within the range of the totalizer.
•
Observe minimum input span requirements
between input 1 and input 2.
•
Low input should be less than high input
signal.
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.
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
