9
Installation of the Load Stand
®
II
· Check the wiring polarity at the Test Meter.
Ensure the red, white, and black wires are con-
nected to the corresponding terminals.
· If the wiring is correct and you still observe a
negative output change, the vessel may be tilted.
Vessel tilting shifts the load onto some Load
Stands while putting other Load Stand(s) in a no
load or tension load condition.
This can occur in cases of extreme thermal defor-
mation or unequal vessel leg length. Proceed to
Step 2 to level the vessel.
e) Repeat Steps A through D for each Load Stand
®
for
this vessel.
f) Calculate the average output change for all Load
Stands for this vessel. The output increase for each
Load Stand
®
must be within ±25 % of the average
output increase. Load Stands 1, 2, and 4 meet this
requirement, while Load Stand
®
3 does not.
g) If the installation meets the criteria described
above (change in output is positive and is within
±25 % of the average output increase), the vessel is
sufficiently level.
·
If sufficiently level, proceed to Step 3 to complete
the installation.
·
If not sufficiently level, level the vessel as de
-
scribed in Step 2. 8
Checking Output using Anderson-Negele-Testmeter
Example Recording and Analysis of Output for Level Check
Load Stand
®
Nr.
Not installed output (no load)
(mV)
Installed dead weight
(mV)
Output change
(Installed - Not installed) (mV)
1
+30
+90
+60
2
-15
+50
+65
3
+17
+30
+13
4
-25
+30
+55
Average Output Change = (60 + 65 + 13 + 55) / 4 = 48.25
Allowable Range for Output Change max. ± 25 % = 48.25 ± (1/2 x 48.25) = 36.18 to 60.3
All Load Stands must meet the requirement that all output
changes must be positive (+). Load Stands 1, 2, and 4 meet
the requirement that the output change be within ±25 %
of the average output change. Load Stand
®
3 does not meet
the requirement, and its small output change indicates it is
carrying much less weight than the other supports. This load
stand must be adjust with the leveling nuts or by shimming
to carry additional weight. The vessel must be level to distri-
bute the weight evenly over all the supports.
B W R SHLD B W R
TB1 TB2
B W R B W R B W R B W R
SENSOR A SENSOR B SENSOR C SENSOR D
LOAD STAND STANDARDIZATION
TB
3
Red White Black
ON
OFF
SENSOR
TEST
METER
ADJUST
SIMULATE
TEST
+EX
SIGNAL
-EX
Junction Box
Anderson-Negele-Testmeter
Note: Wiring from sensors
to terminal TB3 not shown
for clarity.
Summary of Contents for Load Stand II
Page 23: ...23 Notes ...
Page 24: ...2 4 Notes ...
