Description

• Measures bending modulus of elasticity (E) and ultimate bending strength of dimension lumber
• Designed to measure bending strength and stiffness of the full range of dimension lumber sizes
• Operator-selectable ranges are zero to 1,000 pounds or zero to 10,000 pounds (0-10 kN or 0-25 kN) (Metric readout is optional)
• A four-point loading system applies a specifi ed load at 1/3- and 2/3-span locations which allows the bending moment and the extreme fi ber stress to essentially be constant between the inboard loading heads
• E calculated from the defl ection and force measurements
• Deflection of strong-back: less than 1% of test-piece defl ection, at worst case
• Electronic load cell measures the total applied force
• Peak track-and-hold circuit stores the maximum force reading, allowing the operator to stress a piece to failure without watching the digital readout during the test
• Digital display indicates E for standard cross-sections at a predetermined defl ection and span
• Lumber normally tested on-edge; fl atwise testing is optional
• The back-load feature allows lumber to be loaded from the back
• Results provide for direct comparison with the Model 7100 CLT and Model 7200 HCLT.
• Model 312 system includes a Digital Force Measurement System, hand-operated hydraulic pump, and an aluminum test bar

Specifications

General

The Model 312 Bending Proof Tester provides edgewise bending tests on dimension lumber in sizes from 2x3 to 2x12. Load is applied with a hand-pump hydraulic system and measured with an electronic load cell system which also measures the maximum load applied prior to failure of the specimen.

Instrumentation System

Software	Microsoft Windows™ and Metriguard 312 User Interface Software.
PC Data System	Desktop computer included.
Electronic Interface Unit	Instrumentation and enclosure.
Load cell	Electronic, 10,000 lb (45.5 kN), compression
Deflection sensor	0-1.18 in (0-30 mm) range
Units	Imperial (lb, in & psi) and SI (N, mm & Pa)

Material Size Capacity

Width	2.5 to 11.25 in (64 to 286mm)
Thickness	1.2 to 2.0 in (30 to 51 mm)
Flatwise E	1.5 x 3.5 in (38 x 89 mm)

Setup Configurations

Spans L	52.50, 73.50, 90.42, 94.50, 115.50, 152.50, 185.00 in
Span-to-Depth ratio L/h	2 1 ( 2 x 3 ) , 2 1 ( 2 x 4 ) , 16.44(2X6X8), 21(2X5), 21(2X6), 21(2X8), 20(2X10), 16.44(2X12) [BOTH 2X10 & 2x12 are tested in the 185 in span]

Mechanical

Deflection of strong-back	less than 1% of test-piece deflection, at worst case
Calibration test bar	1.5 in x 3 in x 10 ft (38.1 x 76.2 x 3050 mm) 6061-T5 aluminum (included)
Ring force gauge	0 – 2000 lb (0 - 8.89 kN) NIST-traceable cal standard. Included for calibration.
Electronic calibration	A shunt calibration feature is provided for quick verification of load cell amplifier gain setting
Power requirements	115/230 Vac 60 Hz (50 Hz) single phase. 2 amp.
Hydraulic pump	Manually operated, single-stage
Fluid	AW ISO 46

Shipping Dimensions (Unit is shipped in two packages.)

Length	16 ft (4880 mm)
Width	24 in (609 mm) base
Height	84 in (2134 mm)
Shipping weight	3000 lb (1361 kg)