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TR TEST and BRITTLENESS POINT


Low Temperature Check
Automatic instrument for the determination for both TR TEST and BRITTLENESS POINT

nstrument characteristics
The structure of the Low Temperature Check has been designed to permit the installation of arrangements for TR and Brittleness point tests. 
The structure includes all common parts required for low temperature testing:
- 5 litres thermal insulated stainless steel bath for cooling liquid.
- heat exchangers for bath cooling
- thermal resistance for bath heating
- PT 100 thermal sensor and PID thermoregulator with 0.1°C accuracy for the automatic regulation of both cooling and heating
- stirrer for bath homogenisation
- compressed air pressure control and cleaning system.
- electronic card for the complete control fitted with usb port for connection to pc.
- safety devices (independent bath overheating controller, thermal switch, pneumatic lock for sample holders)

Cooling system
The bath cooling devices provided by Gibitre can be either a nitrogen tank or a refrigeration unit.
The regulation of the cooling is automatically controlled by the instrument according to the temperature set of the test procedure in use.""

Temperature Retraction Test
The arrangement for TR test includes:
- Sample holder for the simultaneous test of 6 samples
- Pneumatic lifting system for the easy handling o f the sample holder
- Windows bases software for TR test performance
- Datagest software for database management

The Sample Holder makes it possible to:
- carry out simultaneous testing on 6 samples.
- read automatically the retraction of each sample with 0.06 mm resolution
- lock sample position in extended position during test preparation
- automatically release of test samples at the end of the conditioning time.

The software permits to prepare and store test procedures with custom defined test conditions
When the test procedure to be used has been selected, the program carries out the test automatically:
- the user is asked to insert test identification, sample length and percentage elongation for each group of samples (up to 3 groups of samples can be tested simultaneously)
- the temperature is automatically adjusted by regulating the connection to the cooling device and the heaters.
- when the immersion temperature has been reached, the operator is asked to insert the samples.
- after immersion, the instrument automatically regulates the conditioning temperature according to the requirements of the standards and measures conditioning time.
- the samples are released after the defined conditioning time
- the temperature increase is automatically regulated,
- the retraction curves, the temperature vs. time curve for each sample are automatically drawn until the set final temperature is reached.
- standard test results an

Brittleness point test
The arrangement for Brittleness Point test includes:
- Pneumatically actuated striker
- Sample holder for the simultaneous test of 10 samples
- Win dows bases software for Brittleness Point test performance
- Datagest software for database management.

The striker is in compliance with international standards and the clearance can be set according to the kind of test (4.8, 5.2, 5.7, 6.4 mm).

A pneumatic piston drives the striker and permits to perform the tests while the samples are immersed in the cooling liquid. A pressure regulator enables the speed of the striker to be adjusted in compliance with standards depending on the number of samples and the density of the cooling liquid in use.
The speed of the striker is measured automatically at each test and compared with the required tolerances (tra 1.8 e 2.2 m/sec).

The software permits to prepare and store test procedures with custom test conditions
When the test procedure to be used has been selected, the program carries out the test automatically:
- the user is asked to insert test identification,
- the temperature is automatically adjusted by regulating the connection to the cooling device and the heaters.
- when the immersion temperature has been reached, the user is asked to insert the samples.
- after immersion, the instrument automatically regulates the conditioning temperature according to the requirements of the standards and measures conditioning time.
- at the end of the conditioning time, the striker is automatically activated
- after the removal of the sample holder from the test bath and the visual inspection, the user can insert in the sof

STANDARDS:
TR test: ISO 2921; 
ASTM D 1329, D 746
Brittleness point: ISO 812, 974; 
ASTM D 2137; DIN 53 546

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