The Pegasor Mi2 was welcomed as the first turnkey monitoring system for modern automotive PM and PN emissions monitoring, but we always knew there were things we could have done differently - well now we have!
The latest addition to the Pegasor product range is the Pegasor Mi3 and is already available for order and shipping. But how does it compare with the Pegasor Mi2?
- The heart of the two versions is the same. The core technology is the Pegasor PPS-M sensor that uses the lost charge method of monitoring fine particles. This technology has been widely evaluated over the last three years and has never failed to meet the criteria it has been set against.
- The main difference is that the Mi3 can be driven with our PPS plotter software. Our user base is primarily used to operating the PPS sensor via our purpose designed software package and whilst the Mi2 configuration with an inbuilt control processor and screen interface has proved popular, we have had many requests to be able to drive the Mi2 via an external control package co located with other test cell control mechanisms. The latest version of PPS Plotter provides full control of the instrument including comprehensive and remote configuration of all the various data output functions that have been built into both the Mi2 and the Mi3. PPSPlotter will not work with existing Mi2 units. If you would like to know more about upgrading your Mi2 to the Mi3 specification please get in touch.
- Instrument configuration and test protocol design is done via the PPS Plotter software after which the computer can be disconnected if necessary. Data is output to local test cell data management through a variety of output connection options
- Zero Function and Dilution The Mi3 extends our use of the clean air supply from the Mi2 which was used to flush the probe in order to achieve a realtime zero check during prolonged monitoring. That clean air supply can now be adjusted incrementally during monitoring of very high particulate levels (e.g. in a chimney or on raw exhaust) to provide a controlled, stable dilution ratio that is included in the Mi3's data analysis algorithms.
- FlowCheck During long monitoring periods under steady state conditions, we have included a flow check function. Pressing the flow check button opens the zero air feed to deliver a precise amount of air into the tip of the sampling tube. The resulting dilution rate is a direct function of sample and zero air flow rates and as one is known precisely the other (sample rate) can be calculated accurately and stored in the data file
- We have also taken this opportunity to enhance the durability of some of the electronics components to further harden the instrument against the rigours of the often harsh environments it is used in.
- Mi3 now incorporates a USB port dedicated to the PPS Plotter software interface as well as keeping the four analogue data and one ethernet AK Protocol connectors. There is also a CAN-Bus connection via a D9 connector
- Apart from the control and interface functions, the Mi2 and Mi3 are essentially the same. So much so that the current PN and PM PEMS trials being carried out by JRC on behalf of the EU have been amended to look at both versions because they are so alike. We anticipate that he trials on Mi3 will be completed before Christmas with a report issued in January 2014.
- There are three operating modes, Standby, Measure and Stop. The various modes include these conditions:
So far the Mi2 and Mi3 have passed all the tests that JRC have carried out in order to establish if the units comply with the EU's requirements with respect to PEMS Monitoring of engine emission particulate. Particle Mass (PM) have correlated well with existing reference methods, but with much higher time resolution and sensitivity at lower concentrations. Some of the reference methods in use today were designed around much higher particulate levels and are now suffering at the hands of the laws of diminishing returns. With regard to Particle Number concentrations, (PN), the Pegasor units were compared, without any thermal or catalytic stripper with a PMP standardised system and were found to have a higher output especially during periods of high acceleration as are found in the NEDC. This is entirely predictable and is the result of the Pegasor units seeing the volatile and semi volatile particles that are specifically precluded from the PMP measurement protocol. The tests going on during December will include the addition of a catalytic stripper so we should see the results of a much more relevant (to the automotive industry) comparison. We will be sharing JRC's results with you just as soon as they have been published.
We have a brochure for the Mi3 and would be pleased to send you one. Please contact us for further information.
By the way, the price? its exactly the same as for the Mi2, so the only choice you have to make now is whether you prefer internal or external control functions. We look forward to hearing from you soon.