AFA 500-MK2	AFA 500-MK3	AFA 1000/1-MK2	AFA 1000/1-MK3	AFA 1000/2-MK2	AFA 1000/2-MK3
Audible alarm	Yes	Yes	Yes	Yes	Yes	Yes
Visual Display	LEDs	LEDs	LEDs, analog bar graph, face velocity	LEDs, analog bar graph, face velocity	LEDs, analog bar graph, face velocity	LEDs, analog bar graph, face velocity
LEDs	Red, green	Red, green	Red, yellow, green	Red, yellow, green	Red, yellow, green	Red, yellow, green
Alarm range	30-400 fpm	30-400 fpm	0-999 fpm	0-999 fpm	0-999 fpm	0-999 fpm
Horn Silence	Temporary or permanent	Temporary or permanent	Temporary or permanent	Temporary or permanent	Temporary or permanent	Temporary or permanent
Password protection	No	No	Yes	Yes	Yes	Yes
Face velocity display range	n/a	n/a	0-999 fpm	0-999 fpm	0-999 fpm	0-999 fpm
Airflow sensor	On board	On board	Surface, 90º inline or straight inline	Surface, 90º inline or straight inline	Surface, 90º inline or straight inline	Surface, 90º inline or straight inline
Field calibration	1- or 2-point	1- or 2-point	2-point (with on screen instructions)	2-point (with on screen instructions)	2-point (with on screen instructions)	2-point (with on screen instructions)
Low air alarm delay	5 seconds (fixed)	5 seconds (fixed)	0-60 seconds	0-60 seconds	0-60 seconds	0-60 seconds
Relay outputs	1 (low air alarm)	1 (low air alarm)	3 on board, 5 total with optional unit	3 on board, 5 total with optional unit	3 on board, 5 total with optional unit	3 on board, 5 total with optional unit
Analog output	No	No	0-10V (equal to 0-200 fpm)	0-10V (equal to 0-200 fpm)	0-10V (equal to 0-200 fpm)	0-10V (equal to 0-200 fpm)
Relay inputs	2 (night setback, sash high)	2 (night setback, sash high)	3	3	3	3
Comm. Port	RS232 (optional)	RS232 (optional)	RS232 (optional)	RS232 (optional)	RS232 (optional)	RS232 (optional)
Sash High indication	Yes, with additional component	Yes, with additional component	Yes, with additional component	Yes, with additional component	Yes, with additional component	Yes, with additional component
Temperature monitoring	No	No	Yes, with additional component	Yes, with additional component	Yes, with additional component	Yes, with additional component
Night Setback	Yes	Yes	Yes	Yes	Yes	Yes
External alarm	No	No	Yes	Yes	Yes	Yes
Auxiliary pushbuttons	No	No	No	No	3, can be interlocked	3, can be interlocked
Input power	120VAC, 60Hz	120VAC, 60Hz	120VAC, 60Hz	120VAC, 60Hz	120VAC, 60Hz	120VAC, 60Hz
Output power	15VDC, 500ma	15VDC, 500ma	15VDC, 500ma	15VDC, 500ma	15VDC, 500ma	15VDC, 500ma
Panel cutout dimensions	3.35" x 4.65"	2"x 3"	3.35" x 4.65"	2"x 3"	3.35" x 4.65"	2"x 3"