B-TEK Scales T405S, Service Manual

Page: 39 / 156

T405S Indicator Service Manual 39
6.2 Calibration Procedure
6.2.2 Zero Procedure
ZEro Access the scale zeroing process.
cAL.ZEro Use this to record the zero point. Follow the menu above to
complete the zero calibration. A
c on the display denotes the
fact you are in the calibration procedure.
tEmP This is an alternate zeroing procedure. Use this when the
product weight on the scale, such as in a tank or vessel,
appears to be inaccurate but cannot be removed to establish
a no-load condition.
Enter the calibration procedure and select Temp. zero. The
current weight on the scale will be temporarily assigned as the
Cal Zero value. Continue to the SPAN procedure, key in the
value of the test weights and place them on the scale and
complete the SPAN procedure. The original Cal Zero is
restored after exiting the span procedure and the current
product weight will now be correctly represented.
Due to factors that created the original inaccuracy, it may be
necessary to re-zero the scale when the tank or vessel is
empty.
LASt This is an alternate zeroing procedure. Use this if certified test
weights placed on the scale display a slightly inaccurate
value. Be sure that the scale is at zero before the test weights
are added and enter the calibration procedure and select
Last
zero. The last acquired zero value will be assigned as the new
Cal Zero value.
Continue to the SPAN procedure without removing the test
weights. Key in the value of the test weights on the scale and
complete the SPAN procedure. The test weights will now read
accurately.
Zero
Last Cal.Zero Temp
Live weight
displayed.
Remove all weight.
Live weight
displayed.
On the initial zero calibration of the indicator to a new scale, the zero cal counts may
appear unstable. Continue to the span calibration and when completed the condition
should correct itself.