PT113
Instruction Manual
22
scale must be stable during span calibration.
•
Approximately 5 seconds later, the new calibration settings are saved automatically.
•
If any error occurs during calibration, an error message warns you.
•
Click the
Yes
button to reload the previous values or click
No
to use the new settings.
You can adjust zero or span of your scale without performing full calibration. Additionally, the
span
adjustment under load
feature provides and advantage to the PT113 in after-sale service where just the
span can be calibrated without emptying the scale to perform a zero.
6.3.3.3.2 Zero Adjustment
If your scale has a residual zero offset, you may perform just zero adjustment without span setting.
•
Select
Zero adjustment
and press the
Start
button, the zero calibration window is displayed.
•
Unload the scale and click the
OK
button. The [WAIT] message appears on the virtual display
during zero adjustment. During zero calibration the scale must be stable. Approximately 5
seconds later zero adjustment will be finished.
•
After finishing the zero adjustment, the instrument will save the coefficients automatically.
Note
:
Zero adjustment can also be performed over field bus commands. Refer to the data structure of
related field bus.
6.3.3.3.3 Span Adjustment
If your scale has a span drift, you may perform just span adjustment without zero setting.
•
The scale should be empty to start.
•
Select
Span adjustment
and press the
Start
button, enter the test weight value.
•
Place the test weights on the scale and press the
Yes
button. The [WAIT] message appears on
the virtual display for approximately for 5 seconds while span calibration is being performed.
The scale must be stable during span calibration.
•
After finishing the span adjustment, the instrument will save the span coefficients automatically.
Note
:
Span adjustment is also performed over field bus commands. Refer to data structure of related
field bus.
6.3.3.3.4 Span Adjustment under Load
This feature is used to perform span adjustment without having to unload the scale. This operation is
especially useful for span adjustment for non-empty tanks and hoppers, removing the need to empty
the tank for calibration.
•
Select
span adjustment under load
and press the
Start
button. A temporary zeroing message
appears on the monitor. This means the instrument will accept the existing load as a temporary
zero.
•
If the scale is stable, press the
Yes
button. The [WAIT] message appears on the virtual display
for approximately for 5 seconds to take the temporary zero.
•
The the span calibration window is displayed. Load the scale with the test weights and enter the
loaded test weight value, then click the
OK
button. The scale must be stable during span
calibration. Approximately 5 seconds later calibration is complete and the new calibration
settings are saved automatically.
6.3.3.3.5 Change Capacity / Increment
This feature is used to change Capacity/Increment without the need for re-calibration.
6.3.3.4 vCal Electronic Calibration
NOTE: vCal loads are always entered with units of kg. Convert lb to kg by dividing by 2.2046. The vCal
wizard 6.3.3.4.1 will convert a range of different units for you.
Warning:
vCal uses the load cell sensitivity (mV/V) from the data sheets, it does not take into account
local conditions of gravity, mechanical installation and additional cable or summing box resistance. It is
a good starting point and is suitable for many applications without fine tuning as below,
6.3.3.4.2Improving accuracy with vCal
vCal lets you to perform calibration without using test weights. The PT113 is adjusted in production for
increased vCal accuracy. Calibration is performed by entering scale capacity, total load cell capacity,
load cell output and estimated dead load values. If the conditions are convenient for zero calibration
(i.e. the scale is empty), you may perform automatic zero adjustment instead of entering an estimated
dead load.
Record the values entered so that span or zero can be adjusted in the future for improved accuracy.
