AEM 30-3020M Water Methanol Failsafe Device - Manual (Page 16)

Page 16
Status Lights
The Water/Methanol Failsafe gauge has two status lights (see below) that indicate when an alarm has been triggered.
The left status light will turn on if there is a low flow alarm. The right status light will turn on if there is a high flow alarm.
Both status lights will turn on if the auxiliary input is triggered.
Analog Output
The analog output from the Water/Methanol Failsafe is a linear dc voltage signal that varies with flow. The signal is used
for sending information to a data logger or an engine management system like the AEM EMS or F/IC. The output range is
automatically scaled when either the 500 cc/min or 1000 cc/min flow range is selected in the Gauge Configuration tab.
The transfer functions for the analog output of each flow range are listed below in cc/min and gal/hr.
500 cc/min Specifications:
Minimum Voltage/Flow: 0.5Vdc at 0 cc/min
Maximum Voltage/Flow: 4.5Vdc at 500 cc/min
Transfer Function cc/min: Flow (cc/min) = (125 * Voltage) – 62.5
Example: Output voltage of 2.5Vdc = 250 cc/min
(125 * 2.5) – 62.5 = 250 cc/min
Transfer Function gal/hr: Flow (gal/hr) = (1.98 * Voltage) – 0.99
Example: Output Voltage of 2.5Vdc = 3.96 gal/hr
(1.98 * 2.5) – 0.99 = 3.96 gal/hr
A list of output voltages and corresponding flow rates is shown on Page 17 - Table 1.
1000 cc/min Specifications:
Minimum Voltage/Flow: 0.5Vdc at 0 cc/min
Maximum Voltage/Flow: 4.5Vdc at 1000 cc/min
Transfer Function cc/min: Flow (cc/min) = (250 * (Voltage)) – 125
Example: Output voltage of 2.5Vdc = 500 cc/min
(250 * 2.5) – 125 = 500 cc/min
Transfer Function gal/hr: Flow (gal/hr) = (3.96 * (Voltage)) – 1.98
Example: Output Voltage of 2.5Vdc = 7.93 gal/hr
(3.96 * 2.5) – 1.98 = 7.93 gal/hr
A list of output voltages and corresponding flow rates is shown on Page 17 - Table 2.
Illuminated Status Lights
Left
Status
Light Right
Status
Light