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Summary of Contents for ECM AFRecorder 1200A
- Page 1 AFRecorder 1200A Fast Air-to-Fuel Ratio Analyzer Instruction Manual 3/05 Part Number 1210A-5...
- Page 2 © COPYRIGHT 2005 by ECM: ENGINE CONTROL AND MONITORING. All Rights Reserved. No part of this manual may be photocopied or reproduced in any form without prior written consent from ECM: ENGINE CONTROL AND MONITORING. Information and specifications subject to change without notice.
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Page 3: Table Of Contents
Table of Contents Introduction The AFRecorder Model 1200 The AFRecorder Model 1200 Components List Important Operation Notes How to Use Front Panel and the “SYS” Key Power and AFR Sensor Mounting Calibration Pressure Compensation Analog Output and Simulated O (SEGO) Sensor Output AFR Recording and Statistics PC Software and RS-232 Control Specifications and Limits... -
Page 5: Introduction
Introduction The AFRecorder Model 1200 The AFRecorder Model 1200 is a highly integrated air-fuel ratio analyzer that packs the following features into a small and easy-to-use package: • Displays in AFR (air-fuel ratio), λ (Lambda), and %O • Wide range of operation: AFR: 6.0 to 150.0 λ: 0.4 to 10.0 : 0.0 to 22.0 •... -
Page 6: The Afrecorder Model 1200 Components List
The AFRecorder Model 1200 Components List The following items are included with the AFRecorder Model 1200 package: Item No. Description Part Number AFRecorder Model 1200 Display Head 1210A AFR Sensor 2400E-1 Wiring Adapter , 6” 1200A-2 Instrument Wiring Harness , 13’ 1200A-3A 12 VDC Battery Power Clamp-on Adapter , 1.5’... -
Page 7: Important Operation Notes
Important Operation Notes 1. Before installing the AFR sensor, apply a small amount of non-lead containing antiseize compound to its threads. Do not get the compound on the sensor's tip. Do not use teflon tape to seal the treads. 2. Do not operate an engine for more than three minutes with the AFR sensor in the exhaust and the AFRecorder's power off. -
Page 9: How To Use
How to Use Front Panel and the “SYS” Key The front panel has 9 keys, pressing them has the following action: AFR: Displays stoichiometry in air-fuel ratio units λ: Displays stoichiometry in lambda units %O2: Displays exhaust %O CAL: Used to calibrate the AFR sensor. Hold sensor in air, press the ↑ and ↓ arrow keys until the %O in air is displayed on the meter, and then press the “ENT”... -
Page 10: Power And Afr Sensor Mounting
Power and AFR Sensor Mounting Power The AFRecorder can be powered either by AC line power (95-250 VAC) or by a 12 VDC battery. If powered by a 12 VDC battery, it is important that the AFRecorder’s power clamp-on adapter (P/N 1200A-3B) is attached directly to the battery. The reason why is because two ground wires are used in the adapter: one for the sensor’s heater (high current) and one for the AFRecorder’s electronics (low current). -
Page 11: Calibration
Do not use the AFR sensor to plug the hole when the AFRecorder is not being used. Calibration Each AFR sensor supplied by ECM comes with five calibration numbers: io2, ico, ih2, i1, and i2. These numbers should be entered into the AFRecorder before it is used with the sensor. - Page 12 Pressure Compensation Equation for AFR [Equation 1a] AFR(corrected) = (AFR(measured) + B x P) / (1 + C x P) where: AFR(corrected) = the AFR corrected for exhaust pressure. AFR(measured) = the AFR shown on the meter. B = 0.009140 for AFR < 14.57 (rich). B = 0.012100 for AFR ≥...
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Page 13: Analog Output And Simulated O
Analog Output and Simulated O (SEGO) Sensor Output Analog Output The analog output range is 0 to 5 VDC, and programmable in AFR, λ, or %O . For example, you can select AFR as the units, with a 0 V AFR value of 10, and a 5V AFR value of 15. Then, an output of 4.5V would mean an AFR of 14.5. -
Page 14: Afr Recording And Statistics
3. The SEGO feature was designed to match as closely as possible the output of the vehicle's production O sensor. However, the O 2 sensor simulator output cannot be expected to match all vehicle’s O 2 sensor outputs under all operating conditions. AFR Recording and Statistics The AFRecorder has a built-in, non-volatile, 2000 point recording capability. -
Page 15: Specifications And Limits
Specifications and Limits Measurements and Accuracy Units Range Accuracy ±0.1 (stoichiometric) Air-to-Fuel Ratio 6.0 to 150.0 ±0.2 (12<AFR<18) (AFR) ±0.5 (elsewhere) ±0.006 (stoichiometric) Lambda 0.4 to 10.0 ±0.008 (0.8<λ<1.2) (λ) ±0.009 (elsewhere) ±0.2% (0<%O to 22% <2) ±0.4% (elsewhere) Response Time: < 150 ms Calculation Time: 1 ms AFR range given for gasoline with an H:C ratio of 1.85. -
Page 16: Afr Sensor Specifications
AFR Sensor Specifications Installation Thread Size: M18X1.5 mm. Lightly coat with non-lead containing antiseize compound. Hex Size: 22 mm Tightening Torque: 30 ±3 ft-lbf, 40 ±4 Nm The AFR sensor's thread size is identical to that of the exhaust gas oxygen (EGO) sensors used in current production automobiles with 3-way exhaust catalysts. -
Page 17: Fuel Composition And Exhaust Operating Conditions
Fuel Composition and Exhaust Operating Conditions H:C ratio range: 1.00 to 10.00 O:C ratio range: 0.00 to 10.00 N:C ratio range: 0.00 to 1.00 gasoline (1.70 < H:C < 2.10, O:C=0.0, N:C=0.0) (1.75 or 1.85 are commonly used) methanol (H:C=4.0, O:C=1.0, N:C=0.0) ethanol (H:C=3.0, O:C=0.5, N:C=0.0) propane... -
Page 18: Output Specifications
Output Specifications Analog Output Programmable Ranges for: Air-to-Fuel Ratio (AFR), Lambda (λ), or %O Output Range (linearized in displayed units): 0 - 5 VDC Output Range Limit: Setup parameter “An H” must be greater than 1.2 x “An L” Output Current Drive: 20 mA max Bits Resolution: 12 bits Update Rate: 0.01 sec. -
Page 19: General Information
Note that V and V must be measured when the data acquisition system is fully hooked-up and the AFRecorder is fully hooked-up and the AFR sensor is “on”. Simulated Exhaust Gas Oxygen (SEGO) Sensor Output Programmable Transition at Target: Air-to-Fuel Ratio (AFR) or Lambda (λ) "High"... -
Page 21: Appendices
Appendix A: Application Notes The AFRecorder will give you insight into your engine's fueling system (fuel injection or carburetor) that you may never have had before. Here are some things that you may see: 1. During engine warm-up of an electronically controlled engine, the engine may be fueled rich and oxygen pumped into the exhaust via the air pump. -
Page 23: Troubleshooting
The AFRecorder must be returned to the factory for repair. There are no user-repairable components within the AFRecorder. The warranty is void if the AFRecorder is opened. Contact ECM before returning the AFRecorder to the factory. When setting up the analog output range, “An H” must be at least 1.2 x “An L”. -
Page 25: In Air
Appendix C: Calculating the %O in Air The oxygen concentration in dry air (zero humidity) is 20.95% and decreases with increasing humidity. The %O in air can be calculated from the barometric pressure (Pb), the relative humidity (Rh), and the saturated water vapor pressure (Pws) by using the following formula: = 20.95% x (Pb - Pws x (Rh/100)) / Pb The saturated water vapor pressure (Pws) is a function of the ambient temperature (Ta) and is given in the table below. -
Page 27: Protocol For Rs-232 Communication
Appendix D: Protocol for RS-232 Communication The AFRecorder may be operated under remote control using a standard RS232 serial port. The interface uses text (ASCII) command strings. Current values of the AFR, Lambda or can be polled from the unit using simple commands. The interface allows the remote computer to upload or download all AFRecorder setup parameters such as the H:C ratio of the fuel, the analog output range values, and the sensor calibration constants. - Page 28 CALFAST Set display rate to fast DISAFR Set display units to AFR DISLAM Set display units to Lambda DISO2 Set display units to %O EGOAFR Set simulated EGO output units to AFR EGOLAM Set simulated EGO output units to Lambda HYDNO Set Hydrogen fuel calculation off HYDYES...
- Page 29 2: DC power voltage too low 3: DC power voltage too high 4,5,6,7: Sensor errors Poll Commands VALAFR Upload current value of displayed AFR (poll command) VALLAM Upload current value of displayed Lambda (poll command) VALO2 Upload current value of displayed %O (poll command) Upload Recorded Data Commands RECDATA n...
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Page 31: Safety Warnings
Safety Warnings In installation and use of this product, comply with the National Electrical Code and any other applicable Federal, State, or local safety codes. Always wear eye protection when working near engines, vehicles, or machinery. During installation, turn off the power and take all other necessary precautions to prevent injury, property loss, and equipment damage. -
Page 33: Warranty And Disclaimers
Warranty and Disclaimers WARRANTY The products described in this manual, with the exception of the AFR sensor, are warranted to be free from defects in material and workmanship for a period of 365 days from the date of shipment to the buyer. Within the 365 day warranty period, we shall at our option repair such items or reimburse the customer the original price of such items which are returned to us with shipping charges prepaid and which are determined by us to be defective. - Page 36 Los Altos, CA 94023-0040 • USA • (408) 734-3433 • Fax: (408) 734-3432 • www.ecm-co.com...
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