Mettler Toledo PR/SR Operations Instructions Page 23

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21
PR/SR balances Weighing – basic functions
3.3 Zero setting and taring
PR/SR balances have separate keys for the zeroing function ¥ and taring function Œ which enable you to determine
correct tare and net weight values.
Zeroing with the ¥ key sets a new zero point, all weight values including the tare weight are measured with reference to this
point.
The following holds after zeroing: tare weight = 0, net weight (= gross weight) = 0.
Use the zeroing key always when you start the weighing and wish to determine the tare weight first.
With taring using the Πkey, the weight loaded on the balance since the last zeroing is set as a new tare weight. The
previous tare weight is overwritten. The status display "Net" signals that after taring all displayed weight values are net values.
0.00 g-
338.04 g-
500.00 g-
0.00 g-
AutoCal BPTGNet
AutoCal BPTGNet
AutoCal
BPTGNet
AutoCal
BPTGNet
1/10d
Off
On
T
C
1/10d
Set balance to zero with ¥ key.
Add weighing sample to container.
The fill weight is displayed.
The tare weight remains stored until the next taring operation. All subsequent
weighing results are net weights referred to the stored tare weight.
Press Πkey briefly to tare.
Zero and the "Net" symbol are displayed.
Place empty container on the balance.
The container weight is displayed.
Press ¥ key briefly.
0.00 g-
-338.04 g-
AutoCal
BPTGNet
AutoCal BPTGNet
Cal / Test
0
Menu
Zero is displayed. Tare weight and gross weight are cleared.
If you zero the loaded balance, remove the load and then attempt to tare the balance with the Πkey, the
message "Press ¥" appears. A negative tare value is inadmissible. In this case you must first rezero the
balance with the ¥ key after removing the load.
With certified balances, zeroing with load is allowed only up to ±2 % of the weighing range of the balance.
If the load after switching on the balance is greater, the message "Not allowed" appears if a zeroing attempt
is made. Please first reduce the load.
The parameter "PreTare" can be activated in the menu under "Weigh" (see section 6.2). This allows a
known container weight to be entered and called up at any time.
Clearing tare
Remove load from weighing pan.
The display shows the negative tare weight.
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