Heated NOx, NH3 system for Diesel SCR exhaust. . . .
Signal has launched a Heated NOx, NH3 system which provides stand-alone measurements of NOx, NH3, NO, NO2 and total nitrogen in exhaust emissions from diesel and other internal combustion engines.
A three analyser solution for research into Nox Reduction Technology, for the conversion of harmful NOx to harmless N2 . This is where Signal's NH3 system leads the way. It is the ideal tool for measuring NH3 in the development of various NOx reduction technologies such as Selective Catalytic Reduction (SCR),
Lean NOx Traps (LNT) and three way catalysts. It measures NO, NOx and NH3 in high sensitivity real time using three chemiluminescence (CLD) analyser detectors.
The system provides real-time measurement of NH3, NOx, NO2, NO and total nitrogen and can be integrated into the Signal range of MaxSys 900 emission analysis systems, controlled by the Model 102 Host bench unit.
Signal launch StreetBox. 
Signal has launched a unique product aimed at the gap in the market between full reference monitoring stations and simple absorption tubes. The StreetBox is an electrochemical sensor based, battery operated air pollution monitor capable of measuring up to three gases or PM10 plus environmental parameters such as wind speed and direction.
Where reference equipment is expensive, large and requires extensive maintenance; the StreetBox from Signal Ambitech is low cost, compact, easy to install and cheap to maintain. With sensors available including NO2, NO, CO, PM10, SO2, H2S, sound and wind speed and direction, the StreetBox can monitor and record information on a whole range of airborne pollutants and cross reference them to site specific data such as temperature and relative humidity.
These features make it ideal for the requirements of city municipalities to monitor, in real time, the effects of traffic pollution in city centres. Already this new, exciting product has been used in a range of applications from monitoring vehicle emissions to control traffic flow to local authority monitoring hotspots.
Perfectly suited to short term measuring periods, the StreetBox has recently been installed in the garden of a private property to investigate the impact on emissions of a local foundry. In this application it was necessary to obtain real time data to monitor how operations at the plant were impacting pollution levels throughout the day, but space for monitoring equipment was severely restricted.
The StreetBox provides 15 minute averages which are then verified using a gravimetric sampler co-located at the site.
For more information on the purchase or rental of the StreetBox range of products, or to request a datasheet, please telephone 01367 242660 or email isa@signal-group.com
CityNOx NO2 monitoring with vastly reduced footprint.
Signal Ambitech successfully designs and commissions reference method equipment for monitoring NO2 with vastly reduced footprint for location on restricted pavement area site in a central London street where existing or alternative equipment was unsuitable.
Introduction
A central London street is to be fitted with new pollution-absorbing pavement, in a bid to help improve the quality of air in the area. This is the first site in the UK to try out the revolutionary paving, which has been shown to successfully cut local air pollution levels in European cities including Milan and Paris. The scheme is intended to complement more traditional ways of reducing air pollution, such as decreasing traffic flow and vehicle emissions.
The paving stones look just like normal grey paving slabs but have a special top layer containing titanium dioxide (TiO2). This substance helps reduce pollution levels by acting as a catalyst in the presence of sunlight to break down the pollutant nitrogen dioxide gas (NO2) into nitrates. These are neutralised by the concrete and so removed from the air. NO2 is formed during high temperature combustion and in the UK comes mainly from road traffic exhausts, so pollution levels are highest in urban areas with heavy traffic.
NOx levels are to be monitored on a continuing basis to assess the efficacy of the paving slabs.
The Problem
Traditional reference method equipment for roadside ambient NOx monitoring requires a large concrete plinth and a structure which, in some cases, requires planning permission to construct. An installation of this size was unsuitable for the site as it would impinge on the already restricted pavement area for pedestrians.
The Solution
An innovative new chemiluminescence analyser installed into a reduced footprint housing. Utilising equipment developed for use in national monitoring networks, the CityNOx saves on space by removing the calibration gas cylinder from the housing.
As the picture illustrates, the street furniture used to house the CityNOx system makes it unobtrusive in a typical urban environment.
MCERTS Approval for Signal Portable FID range. 
MCERTS approval for the Model 3000HM has now been extended to cover the portable models 3010 MINIFID and 3030PM FID hydrocarbon analysers in the Signal range.
Anyone who has been required to measure Total Hydrocarbon emissions in the UK over the past 10 years will be aware of the Signal 3030PM portable FID. Since it was launched in 1993, the 3030PM has become the standard for VOC stack emissions testing. With all the same technology and features as the Model 3000HM, the 3030PM represents the top of the range for portable FID analysers.
In addition to these, Signal also offer a cost effective entry level portable VOC analyser, the Model 3010 MINIFID. With a simplified user interface, the 3010 is a rugged, simple, easy to use solution to testing in awkward or hard to reach areas.
John Clements, Managing Director says, “The 3000 series of hydrocarbon analysers have always been regarded as the top end of the market. Now that extensive tests carried out by the UK NPL and AEA laboratories have authenticated this status, we can concentrate on future developments of this product to further enhance its usability.”
The full range of MCERTS approved FIDs is also available for hire from our rental division.
