AEM 30-5140M Analog Oil Transmission Water Temperature Metric Gauge - Manual (Page 5)

Page 5
Analog Output
The analog output from the AEM Temperature gauge is a linear dc voltage signal that
varies from 0.5 Vdc at 100°F (40°C) to 4.5 Vdc at 300°F (148°C) over the operating
range of the gauge. The signal is used for sending information to a data logger or an
engine management system like the AEM EMS or F/IC. The transfer function for
temperature in degrees Fahrenheit is listed below.
Temperature (Fahrenheit) = 50 x Voltage + 75
The transfer function for temperature in degrees Celsius is listed below.
Temperature (Celsius) = 27 x Voltage + 26.5
A list of output voltages and corresponding temperatures is shown below in Table 1.
Voltage Temperature
0.50 100 degF 40 degC
0.75 113 degF 47 degC
1.00 125 degF 54 degC
1.25 138 degF 60 degC
1.50 150 degF 67 degC
1.75 163 degF 74 degC
2.00 175 degF 81 degC
2.25 188 degF 87 degC
2.50 200 degF 94 degC
2.75 213 degF 101 degC
3.00 225 degF 108 degC
3.25 238 degF 114 degC
3.50 250 degF 121 degC
3.75 263 degF 128 degC
4.00 275 degF 135 degC
4.25 288 degF 141 degC
4.50 300 degF 148 degC
Connector Pinouts
The pinouts for the 3-pin sensor harness and 8-pin power harness are provided
below in Figure 6.
Figure 6. Harness Pinouts
Table 1. Analog Calibrations