PCB Load & Torque, Inc.
Toll-Free in USA 866-684-7107
716-684-0001
www.pcbloadtorque.com
DUAL BRIDGE LOAD CELL OPERATION MANUAL
2
1.0 INTRODUCTION
Dual bridge fatigue-rated load cells manufactured by PCB
Load and Torque, Inc. are guaranteed to last 100 million fully
reversed cycles (full tension through full compression). These
load cells feature high accuracy with resistance to off-center
loading, extraneous bending and side-loading forces. The load
cells are manufactured using premium fatigue resistant steel or
aluminum, and are carefully processed to ensure mechanical
and electrical integrity, as well as accuracy. The nominal full
scale output of the fatigue rated load cells is 2.0 mV/V.
The following document explains how to properly install the
dual bridge load cell, including detailed procedures on
specified torques installation, adapter thread class 3 and
tension pre-load specifications.
2.0 SAFETY PRECAUTIONS
Fatigue rated load cells are designed with very high safety
factors for overload, and of course, cyclic fatigue loads when
used in testing programs. However, failure of the load cell
structure or fasteners used in the load cell installation may
cause personal injury and equipment damage.
It is important to provide adequate clearances and safety
guards or shields properly surrounding test fixtures where
fatigue rated load cells are used.
It is important to review the manufactured data when selecting
rod ends and fasteners for load cell installation. Failure might
occur due to combine measurement axis and extraneous loads
if installation specifications are not followed. All test fixtures
designed for use with fatigue rated load cells should be
carefully evaluated for potential failure modes of the fixtures.
It is important to use threaded fasteners properly when
assembling test fixtures used with the load cells. Fixtures with
inadequately designed bolted joints, or improperly tightened
threaded fasteners can fail before the parts under test have
completed the planned fatigue test cycles.
3.0 OVERVIEW
Dual bridge fatigue-rated load cells are specifically designed
for repetitive testing. Applications include material testing,
component life cycle testing, and structural testing. The load
cells contain an extra bridge to be used either as a back-up
incase the primary bridge fails during a test, or just for
confirmation of the primary bridge readings. As an added
benefit, these load cells are extremely resistant to extraneous
bending and side loading forces
3.1 Dimensions
The following figure and table give the general outline
dimensions of the dual bridge fatigue-rated load cells.
1
2
3
4
11
∅
∅
∅
∅
5
12
∅
∅
∅
∅
9
15
10
R
6
13
14
∅
∅
∅
∅
7
∅
∅
∅
∅
8
Model Series
1403
1404
1408
1411
Capacity (Lbf)
5k
12.5k, 25k
50k
100k
Dimensions
(see Figure 1)
(in)
(mm)
(in)
(mm)
(in)
(mm)
(in)
(mm)
1
2.50
63.5
3.50
88.9
4.50
114.3
6.50
165.1
2
1.37
34.8
1.75
44.5
2.50
63.5
3.50
88.9
3
1.13
28.7
1.75
44.5
2.00
50.8
3.00
76.2
4
1.25
31.8
1.63
41.4
2.25
57.2
3.25
82.6
∅
∅
∅
∅
5
4.12
104.6
6.06
153.9
8.00
203.2
11.00
279.4
R
6
2.54
64.6
3.53
89.7
4.85*
123.2*
6.10*
154.9*
∅
∅
∅
∅
7
3.50
88.9
5.13
130.2
6.50
165.1
9.00
228.6
∅
∅
∅
∅
8
1.25
31.8
2.42
61.4
3.50
88.9
5.38
136.5
∅
∅
∅
∅
9
1.25
31.8
2.25
57.2
3.50
88.9
4.50
114.3
10
45º
30º
22.5º
22.5º
11
0.25
6.4
0.37
9.4
0.48
12.2
0.75
19.1
12
0.03
0.76
0.03
0.76
0.03
0.76
0.03
0.76
13
1/4-28x1 3/4
screw 12 pt.
Qty. 8
3/8-24x2 1/4
screw 12 pt.
Qty. 12
1/2-20x3 1/2
screw 12 pt.
Qty. 16
3/4-16x4 1/2
screw 12 pt.
Qty. 16
14
5/8-18
1 1/4-12
1 3/4-12
2 3/4-8
Thread Depth
0.88
22.4
1.37
34.8
2.12
53.8
2.56
65.0
15
5/8-18
1 1/4-12
1 3/4-12
2 3/4-8
Thread Depth
0.88
22.4
1.37
34.8
1.71
43.4
3.15
80.0
*Indicates dimension with connector protector.
Figure 1
- Dimensions
Table 2
– Dimension Values
Dim.
Description
1
Total Height
2
Load Cell Height
3
Tension Base Height
4
Load Cell Body
Height
∅
∅
∅
∅
5
Load Cell Diameter
R
6
Max. Clearance
Radius
∅
∅
∅
∅
7
Bolt Circle Diameter
∅
∅
∅
∅
8
Top Loading Surface
Diameter
∅
∅
∅
∅
9
Bottom Loading
Surface Diameter
10
Angle Between
Screws
11
Screw Head Height
12
Bottom Loading
Surface Height
13
Screw for Tension
Base
14
Load Cell Mounting
Thread
15
Tension Base
Mounting Thread
Table 1
– Dimension
Descriptions
