Power Unit and Frame with manually operated safety cover
Manual Load Lock for repeat testing
Cylinder Speed Adjustment
Load Limit Control
Load Cell and Digital Meter with Auto Ranging:
1% to 100%
2,500 to 250,000 lbs.
(1,134kg to 113,398 kg)
Lower limit 1% -- 2,500 lbs. (1,134 kg)
RS232 Output Plug
Specifications
Hydraulic Cylinder Stroke 48" (121.92cm)
Total length 30' (9.14m)
Maximum pull pin to pin 20' (6.10m)
Width outside (standard) 38" (96.52cm)
Center line height from floor (std) 14" (35.56cm)
Speed of cylinder per min. (approx.) 36" (91.44m)
Features
Tension is supplied by the hydraulic cylinder. For easier and
faster hook up, the cylinder is in the pulling mode.
The portable proof tester has an adjustable carriage.
Speed adjustment is another feature of the cylinders. It is a
very simple item, but by incorporating it into the power unit,
we are able to make the cylinder retract at the speed desired.
The foundation of this system is the hydraulic
power unit. The ability to control the hydraulics at small increments
with a constant, steady flow of hydraulic fluid to the cylinder
allows us to calibrate to ASTM E-4, 1% , traceable to the
National Institute of Standards and Technology(NIST). Pulsations
or fluctuations in pressure will not be tolerated. These pulsations
or fluctuations of pressure will be transferred into the load
cell and give you erroneous readings on your test data, whether
it be a proof test or a break test. The power unit is connected
to the test machine by hydraulic hoses. This allows the operator
and control unit to be located away from the machine and still
have good visual contact.
The hydraulic power unit has very sophisticated and accurate
pumps and valves for the purpose of adjusting very small increases
in pressure and maintaining a very accurate flow. The power unit
also has electric valves versus manual valves.
For repeat testing, a manual loadlock is furnished at no charge.
For testing several items, the operator sets the loadlock on the
first test piece. The machine will automatically return to this
pressure load each time a new piece is placed into the machine
A remote control pendant is furnished at no charge. This allows
for safer, faster, and easier hookups.
The load measuring system electronic load
cell is the heart of the system. The load cell allows the very
accurate recording of the load attained during a test. The electronic
strain gage load cell is an independent measuring system not
tied into the hydraulic system. This load cell system, with two
ranges, may be calibrated to 1% of the maximum capacity of the
load cell. The load cell will calibrate to ASTM E-4, 1%,
traceable to the National Institute of Standards and Technology
(NIST).
Load cells and gauges are normally calibrated from 10% to 100%
of their range. The lower 10% of a range is usually not calibrated.
Therefore, multiple range such as this machine has, must be used
to calibrate at the lower limits. Two ranges are standard with
Auto Ranging. The lower limit is at least 1% of the maximum capacity
of the machine.
The load cell is not portable with the standard machine. An optional
load cell is designed to be removed from the test bed and used
independently. An example would be load testing an overhead hoist.
The separate peak/hold system is an excellent feature, it automatically
resets. The peak/hold recall must be manually reset after each
use. At times, the last peak could be lost if the peak/recall were
not reset before each test. With an automatic system, you never
lose the peak of the last test because it automatically resets.
Additional Features
Length = 30' (9.14m)
Test Length = 20' (6.10m)
Quick disconnect on hydraulic hoses
Auto Ranging with two ranges:
2,500 lbs to 25,000 lbs
(1,113 kg to 11,340 kg)
25,000 lbs to 250,000 lbs
(11,340 kg to 113,398 kg)
75' (22.86m) of cord from load cell to indicator (indicator is
portable)
Portable
Electrical (power unit)
220 Volts, 3 PH, 60 Hz
7.5 h.p.
Electric (digital indicator)
110 Volts, 1 PH, 60 Hz
Separate circuit
Weight (approximate)
frame = 10,300 lbs (4,672kg)
power unit = 700 lbs (317.5kg)
Options
The Roberts Proof Test Certificate software (Test 35)is included
with machine.
Computer with Microsoft XP software and printer.
Installation Requirements
Installation and training is done under the direction
and supervision of Joseph E. Roberts, President of Roberts Testing
Equipment, Inc. One trip as a minimum will be required to conduct
installation and training at a reasonable rate will be assessed.
Air fare and expenses are not included in this price. The airfare
and expenses will be billed, at cost, on the final invoice.
The following is a list of items furnished
by Roberts Testing Equipment, Inc.:
Design and specifications for the testing machine,
All hydraulic power units, cylinders, load measuring equipment
(digital readout, load cell, etc.), test machine frame (frame will
be sandblasted, primed, and painted),
Advise on installation,
All training for proper use of test equipment.
Operation manual and maintenance manuals.
The following is a list of items to be furnished
by the customer:
Labor for installation
All lifting equipment, crane and/or lifts of sufficient size
for safe unloading and installation including operator.
All electrical connections and electrician to hook up motor and
controls.
250,000 LB. (113,398 KG.) Length 30 ft 9.14m