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Mercury - Model VM-3000 -Vapor Detector
The VM-3000 Mercury Vapor Monitor measures the elemental mercury vapor concentration in air and other gases continuously. It is used in the laboratory or can be installed at places where mercury has to be monitored. Industry people use the VM 3000 Mercury Sniffer as well as university researchers or safety people. It is a great tool for plenty of different applications: work place monitoring, exhaust air monitoring, emissions monitoring in the chemical industry, ground air screening of contaminated areas, quality control of hydrogen and other gases, If you need to monitor for mercury continuousely, this is the right mercury vapor analyzer for you.
- Real Time, Continuouse Mercury Vapor Monitoring
- Sensitive detection method: UV absorption (CVAAS)
- 3 mercury measuring ranges
- 0-100 / 0-1000 / 0-2000 µg/m³
- Sensitivity: 0.1 µg/m³
- Data logger integrated (optional)
- No need for constant calibration
- No detector regeneration required
- No detector saturation
- Automic and Manual Auto Zero
- Heated optical cell avoids condensation
- Can be adapted to a laboratory device for liquid and digested solid samples
- Hg Analyst Software with real time graph and email alert system (optional
The sample gas is fed into an optical cell by a maintenance-free membrane pump. A beam of UV light passes through the optical cell, a part of it is absorbed by the mercury atoms present in the sample. This method is called "atomic absorption spectroscopy" or shortly AAS. It is extremely selective and sensitive. For mercury determination the AAS method has maintained its importance even if other methods have been worked out since the early beginnings. The AAS method is low in interference and does not require an amalgamation step or expensive carrier gases.
The VM-3000 uses a high-frequency driven electrodeless low pressure mercury lamp as UV source. This lamp emits lines of an extremely narrow bandwidth which are congruent with the absorption lines of the Hg atoms. Cross-sensitivities are thus minimized. The extremely high stability of the UV source in the VM 3000 is a result of the reference beam feedback control method. Total background noise is less than 0.1 µg/m³.
- Metal housing with sturdy handle
- Option: Rack version with mounting brackets for 19" racks
- Membrane pump with long service life
- Input filter with easily replaceable filter membrane
- Factory-calibrated- no need for frequent recalibration (short term factory recalibration service available)
- 4-20 mA output and RS232 communication
- Alarm output
The user controls the VM 3000 by menu guided inputs via a waterproof membrane keypad. After switch-on the light source is stabilized (approx. 1-5 minutes). When the measurement mode is started, a zero adjustment is first carried out automatically. Then the analyzer switches to measurement and continuously indicates the measured mercury content of the gas as a numerical value and a graphic bar.
- Duration and Repeat interval of zero adjustment
- Selection of concentration unit (ug/m3 or ppb)
- Measuring range (0.1-100, 1-1000, 1-2000 ug/m3)
- Input of three different alarm levels
- Calculation of a mean value over three freely selectable time intervals
- Printer activation
- Sample dilution factor
The readings are displayed in real time, both numerically and graphically. Measurement data is exported as a 4-20 mA analog signal.
With addition of the optional Data Logger function, the VM 3000 can store up to 30,000 readings in the memory. The logging interval can be set from 1 to 16 seconds revealing a total recording capacity of 4 to 60 hours. The stored data can be read out to a PC using the RS232 serial interface.
Important components of the VM 3000 are permanently monitored. In case of malfunctions the user is warned on the display (blinking messages: clean cell, lamp, low battery alarm) and via output signals.
For Mobile use the VM 3000 is also available with a built in rechargeable battery and charging unit. This option allows mobile battery powered applications of up to approx. 6 hours.
- Measuring Principal: UV-Absorption
- Wavelength: 253.7 nm
- UV Source: electrodeless low-pressure mercury lamp
- Stabilization Method: reference beam and thermal
- Measuring Ranges:
- 0 to 100 µg/m³ (0-10 ppb)
- 0 to 1000 µg/m³ (0-100 ppb)
- 0 to 2000 µg/m³ (0-200 ppb)
- Sensitivity: 0.1 µg/m³ (0.01 ppb)
- Computation of mean value: automated via three freely selectable time intervals
- Response Time (99% signal): < 1 second (no measuring cycles or regeneration required)
- Alarm: 3 levels programmable
- Pump: Membrane pump, approx 2 L/min optional flow meter with alarm message
- Filter: PTFE, 1u, 47-50 mm diameter
- Power Supply: 230 V / 50/60 Hz (110... 120V / 50/60 Hz optional)
- Status Alarms: measuring cell soiled, battery state (option - UV source exhausted)
- Measurement Display: graphical LC display with background illumination
- Signal Outputs: 4...20 mA; RS 232 for PC or printer
- Battery Options: external 12 DC source; optional 12 V batteries integrated, ca. 5h capacity
- Power Consumption: 40W
- Weight: 15 Lbs
- Dimensions: 17.7 " wide x 5.9" High x 13.7" deep
The VM-3000 Mercury Vapor Monitor is the basic model of our modular system for mercury analysis. An optional reaction unit and activation of the according software turns it into a laboratory unit for liquid samples LabAnalyzer-254 Such an upgraded model (= Combination Model) can be used for both applications: LabAnalyzer-254 and VM-3000
