产品介绍

Fast Response Time with High Accuracy 

Automatic Range Change ａnd Calibration 

Operation on all HC ａnd Alcohol Fuels 

Externally Controllable 

Built-in Statistical Functions 

Heated Sampling for Durability ａnd Accuracy 

Wide Sample Pressure Tolerance 

GPIB (IEEE 488) Interface as Standard 

Simple to Operate, with Pre-set Programs 

 

Microprocessor Based

 

产品参数

MEASUREMENT RANGE：5–50 AFR by four steps. Automatic range change mode selectable

 

ACCURACY：± 0·04% volume of O2 which is typically equivalent to better than ± 0·1 AFR, ± 0·005l 

STABILITY：Better than ± 0·02% volume O2 over 2 hour measurement period 

RESOLUTION：± 0·01% volume O2, ± 0·01 AFR, ± 0·001l 

REPEATABILITY：Better than ± 0·02% volume O2. Typically equivalent to better than ± 0·05 AFR, ± 0·003l 

LAG TIME WITH 3M HEATED LINE：Less than 500 milliseconds 

RESPONSE RISE TIME WITH 3M HEATED LINE： Air to Nitrogen; 90% change in less than 300 milliseconds without digital frequency compensation.

 

EXHAUST SAMPLE INLET PRESSURE; TOLERANCE ：–200 mbar to +1 bar, resulting ± 0·003l at low dope, ± 

0·01l at high dope 

EXHAUST SAMPLE FLOW:：Approximately 5 litres per minute 

EXHAUST SAMPLE TEMPERATURE：For 0º to 400ºC use Models P9121 of P9123  For –40º to 100ºC use Models P9116/7 or P9124 

WARM UP TIME：60 minutes 

TYPICAL CATALYST LIFE：500 hours unleaded fuel, 50 hours leaded fuel 

AMBIENT TEMPERATURE：0 to 50ºC 

RECORDER OUTPUTS (STANDARD) ：0 to 1V = 0 to full scale for l/AFR/O2 ；0 to 1V º 0 to 10% O2 

COMPUTER INTERFACE：GPIB (IEEE 488) standard 

HC RATIO ADJUSTMENT RANGE ：0·00 to 9·99 

OC RATIO ADJUSTMENT RANGE ：0·00 to 9·99 

HEATED SAMPLE LINES ：3 metres length standard, 1, 5, 8 or 10 metres, options directly interchangeable 

CONNECTING CABLE - CONTROL UNIT TO 

SAMPLE HANDLING UNIT ：17 way x 6 metre long. Other lengths 1 to 25 metres to order 

SAMPLE FILTER ：19 mm x 90 mm Whatman extraction thimble 

ELECTRICAL POWER REQUIREMENTS ：Single Phase, 2·8kW, 100-120/200-240V, 50/60Hz 

GAS SUPPLIES 

Purge Air 10 litre/mm at 2 to 6 bar 

N2 Zero Gas 5 litre/mm at 2 to 3 bar 

O2/N2 Cal Gas 5 litre/mm at 2 to 3 bar

 

产品介绍

The value of the fast response measurement of Air-Fuel ratios (AFR) has long been appreciated in the study of both 

fuel delivery systems ａnd in-cylinder combustion processes. 

The CUSSONS Lamdascan principle is a well established one. Exhaust sample gas is taken from a source, passed through a heated sample line ａnd diluted with an accurately metered quantity of ‘dope’ gas, which is usually ambient air. The diluted sample is oxidised over a platinum catalyst ａnd passed to a high temperature zirconia cell. Residual oxygen, which is directly proportional to the engine AFR ａnd the known quantity of dope gas, is measured by the zirconia cell. 

Bottled gases (oxygen ａnd nitrogen) may be used in place of the dope air when it is considered that the ambient air is sufficiently contaminated with carbon monoxide or hydrocarbons to cause inaccurate measurement. 

Heated sampling prevents condensation of any hydrocarbon compounds ａnd water vapour, ａnd so increases accuracy ａnd durability. 

 

Statistical functions (Average Value, Standard Deviation, ａnd Peak to Peak), are obtained over a 30 second sampling 

time, ａnd are shown as the Equivalence Ratio (Lambda), or Air-Fuel Ratio, dependent upon display selected. 

Automatic range change by dope gas switching ensures that the zirconium cell is operating at optimum oxygen concentration, ａnd thus at best accuracy. AFR results from 5:1 to 50:1 may be obtained without loss of test data. Range changes may also be selected manually. 

The GPIB (IEEE 488) is a standard feature which suits most forms of computer interface, ａnd permits several Lamdascan sample handling units to be controlled from one ｍaster Lamdascan control unit. This feature is particularly useful for investigating transient mixture distributions. 

Pre-set programs are selectable by positive action push button switches. The hinged front panel of the controller opens to allow access to switches for hydrogen/carbon (HC) ａnd oxygen/carbon (OC) ratios of the fuel used, oxygen/nitrogen ratios of dope ａnd reference gas - normally air, ａnd external analogue signal zero ａnd span settings.

 

Critical pressures are displayed on gauges on the sample handling unit to allow monitoring of correct operating conditions.
英国Cussons快速空气燃油比分析系统P1300\P1301