Appendix i - analog outputs, Pressure output transfer function, Afr output transfer function – AEM 30-4900 Wideband Failsafe Gauge User Manual
Page 16: Voltage afr (gas) afr (lambda)
Page 17
Appendix I - Analog Outputs
There are 2 analog outputs from the Wideband Failsafe; Pressure (MAP) and AFR (O2). These outputs
are both linear DC voltage signals that vary with Pressure or AFR. These signals are used for sending
information to a data logger or an engine management system such as an AEM EMS, AEM F/IC, AEM
Infinity, etc.
Pressure Output Transfer Function
Pressure (psig) = (10 * Volts) – 16
Voltage
Pressure (psig)
Pressure (Bar)
Pressure (kPA)
0.5
-11
0.25
25
1.0
-6
0.59
59
1.5
-1
0.94
94
2.0
4
1.28
128
2.5
9
1.63
163
3.0
14
1.97
197
3.5
19
2.32
232
4.0
24
2.66
266
4.5
29
3.01
301
AFR Output Transfer Function
AFR (Gas) = (2.375 * Volts) + 7.3125
Voltage
AFR (Gas)
AFR (Lambda)
0.5
8.50
0.58
1.0
9.69
0.66
1.5
10.88
0.74
2.0
12.06
0.82
2.5
13.25
0.91
3.0
14.44
0.99
3.5
15.63
1.07
4.0
16.81
1.15
4.5
18.00
1.23