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UT-3000 NG mobile

 

Mobile Mercury Analyzer System for Natural Gas

Mercury Instruments UT-3000 NG mobile

Introducing the new UT-3000 NG mobile

The UT-3000 Ng mobile is especially designed to measure ultratrace amounts of mercury in natural gas at differing sites. The system, for example, thus allows to monitor the efficiency of different Mercury Removal Units (MRUs) in natural gas processing plants.

Applications

  • Natural gas platforms
  • Natural gas exploitation
  • Natural Gas processing plants

Mercury Instruments UT-3000 NG applications

System setup

The System comprises the well proven UT-3000 Ultratracer and the NGSS Natural Gas Sampling System for sample conditioning. Both units are housed within a rigid and sturdy plastic cabinet with sunk-in wheels at the bottom side for easy transport. To provide increased safety for the user a flammable gas sensor is installed inside the cabinet, providing acoustic and visual alarm in case of gas leakage.

Mercury Instruments UT-3000 NG mobile components

System components: NG Sampling System

Mercury Instruments UT-3000 Natural gas sampling system NGSS

The Natural Gas Sampling System reduces the primary high pressure of the sample source (up to 200 bar) to a pressure below 1 bar so that the gas can be fed to the continuously operating analyzer: UT-3000 Mercury Ultratracer. Pressure reduction is performed with a high precision heated pressure regulator.

To guarantee a suitable pre-conditioning the sampling system has two bypass flows; one at the high pressure side and one at the low pressure side.

In order to avoid ingress of water droplets or aerosols into the analyzer a membrane filter is installed in the sample stream.

System components: UT-3000 Mercury Ultratracer

Mercury Instruments UT-3000 Mercury Ultratracer

The UT-3000 uses the Mercury Instruments GoldTrap to capture total gaseous mercury (TGM) directly from the sample. At room temperature mercury is adsorbed by gold. As the gas continuously flows through the trap all the mercury contained in the gas is trapped by the gold. After the mercury is captured, the GoldTrap is heated very quickly, thereby releasing mercury as a gas (thermal desorption). The gaseous mercury is then swept by the flow of purified mercury free air into the optical cell of the detector where the mercury concentration is measured by atomic absorption spectrometry (AAS).

Basis for determination of the mercury concentration by AAS is the resonance absorption of the Hg-atoms at a wavelength of 253.7 nm. The sample gas is carried into the optical cell by a built-in pump. The optical cell is entirely made of synthetic quartz glass. Radiation of a mercury lamp passes through the cell and is measured by a solid state detector. The attenuation of the UV light reaching the detector depends on the number of mercury atoms in the optical cell. The microprocessor performs the quantitative evaluation of the mercury concentration in the sample. In order to get an extremely stable baseline, the UV-light source is controlled by a reference beam and reference detector device.

In addition to this, the UV detectors of the UT-3000 are thermostatically controlled. Heating the optical cell and the GoldTrap makes the UT-3000 insensitive to volatiles like water vapor and hydrocarbons.

AutoRange function

The UT-3000 features an AutoRange function. If activated the sample volume will be automatically be adjusted according to the mercury concentration of the sample. After starting the measurement the smallest possible sample volume will be selected automatically. If the absorbance signal is too low, the sample volume will be increased until the absorbance is within the optimum range.

Mercury Instruments UT-3000 NG mobile - Gasalarm

Increased safety: Gas alarm

For safety reasons the system is equipped with a flammable gas detector. There will be an acoustic pre-alarm every 30 seconds should the methane concentration exceed 1% or a constant acoustic and optic main alarm if the methane concentration exceeds 2.5%.

Mercury Instruments Calset - Manual Calibrator

Manual calibration made easy

The UT-3000 NG mobile comes with a Static Calibration Unit.

To calibrate the UT-3000 connect it to the calibrator. Then simply draw a defined volume from the calibrator using a special syringe (included on delivery) and inject the defined volume into the calibration port of the analyzer.

Mercury Instruments UT-3000 NG mobile Calibration syringe

Options: EEX certified cabinet

Mercury Instruments UT-3000 NG EEX

The specific setup of UT-3000 NG mobile is strongly dependent on the special demands of our customers.

Therefore the system can be equipped with an explsion-proof cabinet certified for hazardous zones 1 and 2.

For convenient calibration without having to open the housing the system can be delivered with an automatic calibration unit.

It also features wheels for easy transportation.

 

UT-3000 NG mobile: Technical Specifications

System
Weight: approx. 50 kg
Dimensions: 72 x 78 x 78 (WxHxD)
Power supply: 230 VAC / 50 Hz;
115 VAC / 60 Hz (option)
Power consumption: 425 VA (UT: 250 VA max; NGSS: 175 VA)
Gas alarm: Acoustic pre-alarm (30 sec interval): Methane >1%
Acoustic and optical main alarm (continuous): Methane >2.5%
Operating temperature: 0 °C ... 40 °C
Operating humidity: max. ca. 90 % R.H., no condensing humidity
CE approval: according to 89/336 and 73/23 EEC
NG Sampling System
Particle filter: 1 micron stainless steel T-filter
Maximum Sample inlet pressure:
approx. 200 bar
Pressure P1 (secondary side of heated pressure regulator):
0.0 – 1.0 bar (0.28 bar / 4 psi typically)
Flow 1: 0 - 5 l/min
Flow 2: 0 - 5 l/min
Materials used: Stainless Steel (partially coated), Viton, Ismaprene
UT-3000 Ultratracer
Measuring component: Total Gaseous Mercury (TGM)
Measuring principle: Collection of mercury onto a gold trap and subsequent release by fast heating, detection by AA
Measurement wavelength: 253.65 nm
UV-source: Electrodeless mercury discharge lamp (EDL), stabilized by reference beam feedback
AutoRange function: Automatic control of sample volume
Optical cell: entirely of fused silica Suprasil, l = 230 mm
Cell temperature: approx. 45 °C, heated
Measuring range
a) lowest range:
b) medium range:
c) screening mode:

a) 0.1 ng/m³-1000 ng/m³ at 10 l sample volume
b) 1 ng/m³- 10 000 ng/m³ at 1 l sample volume
c) 10 ng/m³ - 100 000 ng/m³ at 0.1 l sample volume
Detection limit
according to DIN 32645:

1 pg absolutely or 0.1 ng/m³
Linearity over the 0.2 to 15000 ng/m³ range:
1.5 % or better
Reproducibility: 5 % or better at 14 pg Hg
1 % or better at 1500 pg Hg
Sampling flow: 40 l/h
GoldTrap heating flow: 10 l/h
Data logger capacity: 5000 data sets
Data uotput: Serial (USB / RS232) for PC / Laptop connection
Mercury Instruments As a leading supplier of high precision analytical equipment, we strive at all times to offer top quality solutions. Our products are manufactured according to the ISO 9001 quality regulations.

 

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