Continuous real-time online operation
Easy to operate, self-explaining software
Auto-zero for precise measurement
Available for tabletop, 19" rackmount and mobile use
Measurement range of 0.1 to 3000 µg/m3 (non-linear compensation in high measuring range )
Temperature control for light-source and cuvette
Unique electrodeless mercury lamp with long lifetime (over 20,000 hours)
Wide range power supply (90 - 265 VAC/VDC, 12 VDC)
Graphic TTF-display and one-touch keypad
External Keyboard and VGA monitor, remote control by modem possible
Approved for EMC and low-voltage directives (CE)
Main component ("heart") of a complete range of mercury analysers for gases, liquids, solids
RS 232, RS485, 4-20 mA analog and PLC outputs
Self-diagnosis, status outputs, printer port

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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.

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Functionality

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.

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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.

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Easy Operation

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...100, 0...1000, 0...2000 ug/m3 (ranges are user programmable)

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Fields of Application

Mercury in air
Mercury in gases such as H2 , N2 and Natural Gas.
Work-place monitoring
TLV (Threshold Limit Value) monitoring
Measurement of mercury in exhaust air
Ambient air screening at ground level
Detector for amalgam technology

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Data Display and Output

The mercury concentration is displayed on a 4-line display and is also outputted to a printer interface and an RS- 232 interface. The output is adjusted for pressure and temperature. Mean values over programmable periods of time (e.g. half-hour mean values) can also be calculated. The pressure and temperature of the sample gas can be displayed by pressing a button. An analog output signal is also available for connecting to a data acquisition system or a chart recorder.

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Self-Diagnostics system

The built-in processor constantly monitors the functions of vital components of the HG - MONITOR 3000. If a fault occurs the user is warned via the display and via a separate output signal.

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Technical Specifications

Measuring Method	UV Absorption
Wavelength	254 nm
UV Lamp	Temperature-controlled high frequency excitation lamp
Cuvette	240 mm, quartz glass
Measuring Ranges	0-100, 0-1000, 0-3000 ug/m3 (ranges are user programmable)
(Gaseous phase)	0-25, 0-125, 0-250 ppb
Accuracy	± 2 % at 100 ug/m3
Sensitivity	0.1 ug/m3
Temp/Pressure Compensation	Automatic
Response Time	Selectable, 0 / 1 / 5 Seconds
Calibration	Factory-calibrated
Alarm	2 levels programmable, over full scale
Mean Value	Selectable between 0-999 min
Output Signals	Analog : 0-1 V (optionally 4...20 mA) Digital : Centronics and RS 232~ Status : (Alarm and Error Message)
Display	4-line LCD with background illumination
Pump	Membrane pump, ~ 1.5 l/min
Filter	Dust filter, 50 mm diameter
Power Supply	110 / 127 / 220 / 240 VAC (option: 12 V operation from rechargeable battery), 50 / 60 Hz
Operating Temperature	32 to 113 °F ( 0 to 45 °C )
Dimensions	(Width x Height x Depth) without handle 18 in x 5.2 in x 13 in (449 mm x 133 mm x 331 mm) Optional version: 19" chassis unit
Weight	16.5 lb. ( 7.5 kg )

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Partner

The HG-MONITOR 3000 is made by Seefelder Messtechnik in Germany.

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