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Measurement of mercury concentrations in air or other gases at ultratrace levels
The UT-3000 Mercury Ultratracer provides a compact and reliable tool for measuring mercury in gases at ultra trace levels. Utilizing the high performance GoldTrap amalgamation module and an optimized state-of-the-art AA-mercury vapor detector the UT-3000 Ultratracer offers detection limits at sub-ng/m³ (ppq-parts per quadrillion) levels.
Measuring principle
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 expensive carrier gases.
Automatic operation
The UT-3000 operates automatically. All functions are controlled by an embedded microprocessor. Once the analysis has been started, measurements are performed and data is collected by the built-in data logger. The data logger has a recording capacity of more than 5000 measurements.
Mercury monitoring in natural gas and LNG
Mercury is a frequent constituent of natural gas. It can be found in concentrations ranging from a few µg/m³ to more than10000 µg/m³. An important application for the UT-3000 is the measurement of mercury in natural gas and liquefied natural gas (LNG). A special version of the UT-3000 analyser is dedicated for measurement of mercury in natural gas.
Both a manual system, the Tedlar® Bag Technique, (punctual measurements) as well as automatic systems for on-line installations are available.
For continuous monitoring of Hg concentrations in natural gas Mercury Instruments offers the explosion-proof MMS-NG (Mercury Monitoring Sytem for Natural Gas) in single channel or multi channel versions. Also available is the UT-3000 NG mobile, which can be used at varying measuring sites should need occur.
Mercury Ultratracer UT-3000: Technical Specifications
Measuring principle: Amalgamation on gold (MI GoldTrap), UV absorption (CVAAS),
Wavelength = 253,7 nm
Measuring component: Total Gaseous Mercury (TGM)
UV source: Electrodeless low-pressure mercury lamp (EDL)
Stabilization method: Reference beam method
Optical cell: Fused silica (Suprasil), Length approx. 230 mm, heated, approx. 45°
Sample volume: 0,1 l ... 10 l
Sampling duration: 9 sec. ... 15 min.
Measurement cycle time: 3 ... 17 min.
Detection limit: 0,1 ng/m³ corresponding to 0,5 pg Hg absolutely
Measuring ranges: at 10 l sample volume: 0,1 ng/m³ ... 1000 ng/m³
at 1 l sample volume: 1 ng/m³ ... 10 000 ng/m³
Sample volume determination: Electronic massflow meter (calibrated to 0 °C; 1013 mbar)
Sample gas pump: Rotary vane pump
Sample gas filter (at inlet): Membrane filter PTFE 0,45 µm, exchangeable
Carrier gas: not required
Data display: Display of real-time signal reading during gold trap heating period, display of measurement results in a bar graph diagram
Data logger function: Built-in data logger for record of 5 000 measurements
Signal output:
- analogue: 4 - 20 mA
- serial: RS232 / USB
Calibration:
- manually:
by injecting calibration gas from CalSet (option) into the calibration port - automatic:
with calibration gas unit AutoCal (option)
Power supply:
- 110 - 230 V / 50 - 60 Hz
- 12 V DC (option)
Power consumption: 250 VA max (heating peak)
dimensions: 45 x 15 x 35 cm (W x H x D)
Weight: approx. 9 kg
permissible ambient temperature: 0°C to 40°
Accessories:
Calibration Set (CalSet) for manual calibration
AutoCal unit for automatic calibration
MC-3000 calibration gas generator
Carrying case with handle and wheels
Battery power supply module
