ELECTRONIC TENSILE TESTER

FEATURES :

This bench mounting electronic tensile tester was ergonomically designed to provide a compact, low –cost, functional unit which is quick and easy to operate. It gives extremely high accuracy and yet is robust enough for routine quality control testing. The twin –column desinging permits all –round access to the specimen and grips. The load measurement system utilizes a four figure peak-picking digital voltmeter which displays maximum load until reset. The use of digital readout for load and extension eliminates the high risk of error involved when interpolating from graphs, kills and scales.

LOAD SYSTEM :
The load measurement system is based on reliable high accuracy components and the four figure readout with highest limits of accuracy.

OVERLOAD PROTECTION
The load cell is protected from overload by a builts in sensor, preset to switch off the drive at 120% of full range load. A warning light is incorporated to indicate such an occurrence.

DRIVE SYSTEM :
The motive power is provided by ADC shunt –wound motor for constant forque characteristics which is close – coupled to a lubrication sealed for life gear unit. The twin leadscrews are interconnected by a tensional ruler chain driven through a flexible coupling for smooth operation.

MOTOR CONTROL
The control system uses an nature feedback speed control which gives a speed reset accuracy of better than 1%. The unit has built in dynamic braking to ensure, fast, accurate stopping and extension measurement. Circuit Protection by current limiters and voltage spike protectors is built – in.

CONTROLS :
Straining speed is infinitely variable by means of a calibrated speed control know from 0 to 500 mm/min. Return to original setting is at full speed.

CROSS HEAD LIMIT TRIPS :
An adjustable upper limit setting map enables users to pre-set specimen length and a lower fixed trip prevents any crushed over-travel.

SPECIMEN LENGTH
Electronics Tensile Tester has a total jaw separation of 400 mm. The actual specimen length is infinitely variable from 20 to 350 mm by means of a setting block, where on the crosshead will automatically stop at the predetermined position. GRIP : 25 MM WIDTH.

OPTIONAL FEATURES :
The instrument can be supplied with the digital extension readout replaced by a rule at a reduced cost. The unit can be supplied with a chart recorder.

LOAD TRANSDUCER
The transducer employs an internal diaphragm force running member with bonded four arm bridge temp. compensated from – 20⁰ C to + 90⁰ C to better than 0.005%⁰C and the diaphragm is vented to ovulate changes due to barometric pressure or altitude variation.
Precision : + 0.1% repeatability :0.07%

MEMORY DISPLAY
The load readout is a four digit LED display which holds the maximum load during any test with an accuracy of + 0.02% F.S.D.

CALIBRATION CHECK
A Penal button is provided for reset. The unit calibration can be checked instantly at any time by depressing the front panel calibration and zero button provided on the instrument.

EXTENSION SYSTEM
The system utilizes six digit LED display counter which has a single MOS /LSI integrated circuit with no involving parts, giving the unit a virtual unlimited life.

SIGNAL
The sensing system is monitored by giving direct reading at extension to 0.1 mm and / or percentage of any one specimen length.

READOUT
The counting system works only through the strain side of the circuitry with the display held to enable an operator to take readings while the cross head is fast traversed back to the start of test position. Reset by means of a button on the counter which also serves as a lamp-test check button.

BREAK DETECTION
The specimen break detection is achieved by monitoring the rate of full – off of load and automatically stops the crosshead as rupture takes place, this ensures accuracy of extension measurement return to original setting is at full speed.

SPECIFICATIONS :

LOAD READOUT : dual range four figure “pick peaking” digital display

LOAD RANGES : The machine has dual, 10:1 load range to be selected from the following

NEWTONS KG.

99.99 BY 0.01 N 9.999 kg by 1 kg

and 9.999 by 0.001 N and 0.9999 kg by 0.1 g

500.0N by 0.1 N 50.00 kg by 0.01 g

and 50.00 N by 0.01 N and 5.000 kg by 1 g

999.9N by 0.1 N and 99.99 kg by 0.01 kg

and 99.99 by 0.01 N 9.999 kg by 1g

Load System Accuracy : Better than + 0.3 % of indicated load.

Extension Readout : six figure digital display calibrated in millimeters to 0.1 mm. % of any one given specimen length to 0.1%.

CROSS HEAD STRAIN SPEED : Infinitely variable between 0 to 500 mm /min.

CROSS HEAD RETURN SPEED :At maximum of straining speed range.

CROSS HEAD TRAVEL : Total jaw separation is 400 mm

DIMENSION : 550 (W) X 450 (D) X 1050 H MM

OVERALL WEIGHT :APPROX. 80 KG.