This analyzer for diesel and gasoline engines measures continuous oil consumptions by the S-Trace method.
This analyzer can be measured oil consumptions accurately with high response speed in transient phenomena such as acceleration and deceleration.
The S-Trace method is recognized as time-honored method of continuous measurement of oil consumptions.
The S-Trace method is an excellent method of continuous measurement of oil consumptions globally recognized as seen from many engineering reports issued in Japan and Europe, including SEA-Paper of USA.
Possible to measure continuous and transient oil consumptions… At unit of second.
By the sampling weight method or leveling method, accuracy of measurement cannot be achieved, unless oil consumption reaches a certain level. Measurement thus takes time of at least 1 hour to 10 hours. Accordingly, these methods may have a certain value of use for stationary operation of engines but cannot be used for purposes requiring clarification of mechanism of oil consumption from the viewpoint of development of new engines and quality assurance of engines.
The S-Trace method captures the sulfur component contained in general lubricating oils used for internal combustion engines at the emission gas level. This method thus enables measurement of oil consumptions continuously and transiently in 5 to 10 sec only in matching with the high speed heating type selective flame photometry (S-FPD: Selective Flame Photometric Detector).
Effective for development of new engines.
For development of new engines, fuel and oil consumption are in the relation of trade-off. Thus, it is said that clarification of the mechanism of oil consumption is required for development of high efficiency engines. The “S-Trace method + SFPD method” fully meets the technical requirements to clarify the mechanism of oil consumption.
The figure at right shows an example of case where the mechanism of oil consumption can be known. The data shows trend of oil consumption when a test engine is running at high speed under no load. This data shows the mechanism of oil consumption with oil leaking from grooves in piston rings which are easy to rotate because of no load. It seems that the mechanism has periodicity as shown by sine curve.
Effective for quality assurance of engines.
The S-Trace method has detection sensitivity sufficient for capturing damage with piston rings, damage with cylinder liners or nonconforming grinding accuracy (roughness) of cylinder liners as fine change of oil consumption.
S-FPD method (Selective Flame Photometric Detector) ensures more secure exhibition of features of S-Trace method.
To make the S-FPD method more effective, matching with analyzers excellent in measuring accuracy and response performance is indispensable. Effectiveness of the S-Trace method cannot be realized without S-FPD from viewpoint of technical elements.
Measurement of total sulfur (sulfate) is indispensable for measurement of oil consumptions.
There are many measurement methods of sulfur content, but the measurement method according to reaction of SO2 gas is used in general. A typical example is the NDIR (Non Dispersive Infra Red) method. However, sulfur compounds contained in oil discharged from internal combustion engines cannot be limited to SO2 gas only. SO3, H2S and COS are also possible.
To measure oil consumption from internal combustion engines accurately, measurement of total sulfur is required.
Different from the NDIR method, the S-FPD method enables measurement of total sulfur in principle. Further, the full line from the measuring point to the detector can be heated to high temperature (120 to 300℃). Thus, the S-FPD method is free of loss errors such as adsorption and dissolution of SO2 gas due to installation of a dehumidifier on the way of the system required by the NDIR method. In view of the facts that the S-FPD method brings about reaction to sulfur atoms to enable measurement of total sulfur and that the S-FPD method is featured in sharp detection sensitivity of sulfur compounds of low concentration, it can be said that the S-FPD method is best method to ensure superiority of the S-Trace method.
Response speed performance to transient change is mandatory.
One defect of the measurement of oil consumption according to the sampling weight method or leveling method is that long time is required in principle before one measuring result is obtained. The S-FPD method is featured in sharp sensitivity sulfur compounds and high reaction speed to sulfur content as short as second unit in principle. The method can thus be used for measurement during operation of the test engine in transient state required for clarification of the mechanism of oil consumption.
According to the “S-Trace + SFPD” method, both oil consumption (g/h) and consumption trend can be acquired in 5 to 10 sec only compared with 10 to 20 hours (sampling weight method) and approx. 1 hour (leveling method).
Wide range regardless of addition or non-addition of sulfur content.
The S-FPD method is featured in a wide detection range from the average sulfur content (approx. 0.5 wt%) contained in commercial lubricating oils to the sulfur content discharged from oil with sulfur content forcibly added according to test purposes (up to approx. 1.5 wt%).
Many sales reference
Sulfur content measuring method according to the S-FPD method is not only used for measurement of oil consumption but also for many other objectives.
Examples are shown below.
■Clarification of catalytic poisoning phenomenon .
(quality control of catalysts and development of next-generation catalysts)
■Continuous measurement of sulfur content for reduction
of PM (SOF + soot + sulfate)
■Development of DPF. (Diesel Particulate Filer)
■Countermeasures against exhaust odor.
■Oil consumption and fuel consumption.