1 legal for trade (lft) operation and lft sealing, Cw-11 indicator, Procedure – Ohaus CW-11 Indicator User Manual
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CW-11 Indicator
Procedure
Set up Indicator, and calibrate. After this is done,
remove power from the Indicator.
At the bottom of the rear cover of the Indicator are
two slots. There is a spring clip at each slot location
which holds the cover in place. Insert the small
scewdriver blade into each slot and press and work
the back cover off. With the cover removed, pro-
ceed as follows:
Remove the rear cover. Inside is the battery com-
partment which is wired to the PC board underneath.
Remove batteries if installed.
Remove the four corner screws from the battery
board. One of the screws is crossed drilled to
accept a wire seal when used for legal for trade
applications.
Carefully lift the battery board up and out of the
indicator making sure that that the wires are not
pulled off of the battery connector on the main PC
board.
Refer to the illustrations at the left and note the
position of the CAL jumper. The first illustration
shows the jumper in place. To lock out the menus,
remove the jumper and position it on one pin as
shown in the second illustration. This removes the
jumper and stores it in the event it has to be re-
positioned.
PC Board Connections.
JUMP 1
JUMP 2
1
1
+EXE +SEN +SIG CGND -SIG -SEN -EXE
TXD RXD GND
NEUT 110V 220V
1
3
1
7
50mA
250V
1
J9
3
NEUT 110V 220V
J8
1
3
T1
J7
1
4
2
3
J6
J1
1
5
J5A
J5B
5
J2
1
5
1
6
9
5
J3
1
9
6
5
CW11 MAIN BOARD
CAL
J5
1
5
J4
J10
3.1 Legal for Trade (LFT) Operation and LFT Sealing
Before this product can be used in legal-for-trade or legally controlled applications, it must be inspected in
accordance with local weights and measures or approval agency regulations. It is the responsibility of the
purchaser to ensure that all pertinent legal requirements are met. Please contact your local weights and
measures office or authorized manufacturer's representative for further details.
Legal for Trade (LFT) operation is possible through a Lock Switch ( CAL jumper) located on the PC board. The
Indicator MUST be set up and calibrated prior to performing this proceedure.
+EXE +SEN +SIG CGND -SIG -SEN -EXE
TXD RXD GND
1
3
1
7
CAL
J4
J10