Pubn No: 30000H0K
The aluminium sample cup is integral with a block containing the heating elements. Temperature control is
achieved by a digital heater controller. A precision platinum resistance thermometer measures the
temperature of the cup, providing data for the display and the heater controller.
An LED indicator is provided on the top of the case, adjacent to the sample cup, to warn the operator when
the temperature of the sample cup exceeds 55°C. A factory set thermal cut-out, prevents the cup/heating
block assembly overheating. A manual reset button is situated on the rear panel to restore power after the
assembly has cooled to a safe temperature.
The gas supply for the pilot and test jets is provided by a small refillable butane gas canister that rests in a
holder attached to the rear of the instrument.
The control panel comprises two push buttons, a single control knob, and a display.
Left Hand Button: When the pressed and held down, the control knob may be rotated to set the
temperature.
When momentarily pressed then released, the flash detector probe is reset ready for
the next test.
Right Hand Button: When pressed and held down, the control knob may be rotated to either select the
mode of operation, or set the time interval for the test.
When momentarily pressed, the timer is started/stopped.
Control Knob: When rotated quickly, alters the test parameters in large steps, when rotated slowly,
alters the test parameters in small increments.
Display: A 2-line alphanumeric display shows cup temperature, timer settings, sample size,
calibration information, and whether a flash has occurred.
An audible warning device is incorporated to prompt the operator to carry out the manual flash test and
other actions.
The embedded software has two modes of operation:-
Manual: The temperature of the cup can be set to any value between 0°C and 300°C. The
time delay between the cup reaching the set temperature and the audible prompt to
carry out the manual flash test (i.e. the time allowed for the sample and vapour to
reach equilibrium) can be set between 1 and 30 minutes.
Auto: The temperature of the cup can be set to any value between 0°C and 300°C. The
time delay between the cup reaching the set temperature and the audible prompt to
carry out the manual flash test is automatically set to 1 minute for temperatures up to
and including 100°C, and 2 minutes for temperatures exceeding 100°C The sample
size required for the test is also displayed.
The manual flash test is carried out by pulling a lever which opens a shutter on the lid and dips the flame
from the test jet through the shutter aperture into the vapour space above the sample. An automatic flash
detector will sense if the vapour given off by the heated sample has flashed. The flash detector is “tuned”
to ignore halo and other localised effects. When the lever is released, the test flame is raised from the
aperture, and the shutter will close. A pilot flame will re-light the test jet if it has blown out during the dip
sequence.
At the end of the test, the display indicates the test temperature and whether a flash was detected.
2.3. SAFETY FEATURES
2.3.1. OVER-TEMPERATURE CUT-OUT AND RESET BUTTON
An over-temperature protection device will cut the power to the Setaflash Tester if the temperature of the
cup/heating block assembly exceeds 300°C. The reset button is mounted on the rear of the tester.
2.3.2. TEMPERATURE WARNING LED
'CAUTION HOT' LED is mounted on the top of the tester, which will illuminate when the temperature of the
cup/heating block assembly is above 55°C and power is connected.
Issue K
10 Jun 2007
8
To Next Page
Loading...