sr501 for sale, brand-new and used.

TACO SR501-OR-4 FUEL MIZER SINGLE ZONE SWITCHING RELAY WITH OUTDOOR RESET The FuelMizer™ (SR501-OR) is a microprocessor-based control designed to regulate the supply water temperature of a single boiler, based on the outdoor temperature. The FuelMizer is a boiler reset control and switching relay in one unit; it is ideal for retrofit application, but may also be used in new installations as well. Full outdoor boiler reset control

Fifty HC-SR501 Adjustable IR Pyroelectric Infrared PIR Human Motion Sensor Detection Modules TTL output goes high when it detects people, output is low when it is not detecting. When a person enters the protected area the sensor output is high. When a person leaves the protected area, after the adjustable delay, the sensor output goes low.

50 X SR501 Human Sensors TTL output goes high when it detects people, output is low when it is not detecting. When a person enters the protected area the sensor output is high. When a person leaves the protected area, after the adjustable delay, the sensor output goes low.