Output Pin: a. Ground b. Alarm #1 Available for customization (Normally: Red with LED display) c. Ground d. Power Input: 9-24VDC, 0.04 watts e. Alarm #3. Available for customization f. Voltage Output signal g. Alarm #2. Available for customization(Normally: Yellow with LED display) h. Alarm #4. Time delay output of alarm #1. i. Normal oxygen purity output indication(Normally: Green with LED display) j. Vacant