The measuring principle used in the HG - MONITOR 3000 is based on the resonance absorption of mercury atoms at a wavelength of 253.7 nm.
It exploits the high vapor pressure of mercury and the fact that except for
the noble gases, Mercury is the only element that has monoatomic vapor at room temperature.
The sample gas is continuously fed via a dust filter into the optical cuvette of the HG - MONITOR 3000.
Here an absorption measurement of the radiation emitted by a UV light source (253.7 nm Hg line) is carried out.
The intensity of the UV lamp is continuously measured via a reference beam and the measurement is corrected accordingly to compensate for possible fluctuations of the light source.
UV Light Source
The HG - MONITOR 3000's UV source is a low-pressure mercury discharge lamp with high-frequency excitation.
This method yields extreme-narrow-band emission lines, which are congruent with the absorption lines of the mercury atoms.
This provides improved detection sensitivity and a lower cross-sensitivity compared to other light sources. The lamp has a much longer service life than other UV lamps. The lamp unit is temperature-stabilized.
The HG - MONITOR 3000 is micro-processor-controlled. After it is switched on the device automatically calibrates itself and then switches to measuring mode. Inputs can be made via the waterproof membrane keyboard.
The following parameters are menu-adjustable:
Display of ug/m3 or ppb
Conversion to standard conditions
Time interval for printer output
Alarm level and prelim level
3 time intervals for computation of mean value
Measuring range 0...20, 0...100, 0...1000, 0...2000 ug/m3 (ranges are user programmable)
Aust. Dynamic Technologies Co | Gas Analysis Instrumentation
Aust Dynamic Technologies (ADT) is a specialist company distributing FUJI electric gas analysis instrumentation and other overseas manufacturers of gas analysis equipment.
We design and build gas ...