User's Manual
Chapter 4: Maintenance and Troubleshooting
Parts Replacement and Adjustments
(12/00) 4-7
Shift Test
A shift test verifies that the scale weighs correctly irrespective of load placement. If the
scale does not pass the shift test, verify the overload stop gaps before replacing the load
cell. No adjustment for the shift is possible. If the scale does not pass the shift test, the
load cell must be replaced.
For NTEP and Canadian Weights and Measures tests, use weights equal to 1/2 the
scale’s capacity. Place the test weight sequentially at each of the positions A, B, C, D
and E as shown in Figure 4-5. These positions are the centers of the four quadrants of
the platform and the center of the platform. Note the terminal’s reading of the weight at
each position. The difference between any two positions in the shift test cannot exceed
the tolerance shown in Table 4-4.
For an OIML test, use weights equal to 1/3 the scale’s capacity. Place the weight
sequentially at each of the positions A, B, C, D, and E as shown in Figure 4-6. These
positions are the centers of the four quadrants of the platform and center of the platform.
Note the terminal reading of the weights at each position. The difference between any
two positions in the shift test cannot exceed the tolerance shown in Table 4-4.
SCALE CAPACITY DISPLAY
INCREMENT
US and CANADA
TEST WEIGHT
OIML TEST
WEIGHT
TOLERANCE (NEW) TOLERANCE (IN
SERVICE)
WS30R/WS30VR 30 kg/60 lb 0.01 kg/ 0.02 lb 15 kg/30 lb 10 kg/20 lb +/- 0.01 kg
+/- 0.02 lb
+/- 0.02 kg
+/- 0.04 lb
WS60R/WS60VR 60 kg/150 lb 0.02 kg/ 0.05 lb 30 kg/75 lb 20 kg/50 lb +/- 0.02 kg
+/-0.05 lb
+/- 0.04 kg
+/- 0.1 lb
WS60LR/WS60LVR 60 kg/150 lb 0.02 kg/ 0.05 lb 30 kg/75 lb 20 kg/50 lb +/- 0.02 kg
+/- 0.05 lb
+/- 0.04 kg
+/- 0.1 lb
WS150R/WS150VR 150 kg/300 lb 0.05 kg/0.1 lb 75 kg/150 lb 50 kg/100 lb +/- 0.05 kg
+/- 0.1 lb
+/- 0.10 kg
+/- 0.2 lb
WW250VR 250 kg/500 lb 0.1 kg/0.2 lb 125 kg/250 lb 80kg/170 lb +/-0.1 kg
+/-0.2 lb
+/- 0.2 kg
+/- 0.4 lb
WW500VR 500 kg/1000 lb 0.2 kg/0.5 lb 250 kg/500 lb 170 kg/350 lb +/- 0.2 kg
+/- 0.5 lb
+/- 0.4 kg
+/- 1.0 lb
Figure 4-5
Figure 4-6
Table 4-4
A
C
E
A
B
E
C
D
BD