M500M-4-20 Analog Input Module The System Sensor M500M-4-20 analog input module demonstrates our commitment to offer solutions for all applications. Features •SEMS screws for easing wiring •Panel controlled status LED •Analog communications •Rotary address switches •Low standby current •Mounts in standard 4 inch junction box The M500M-4-20 Analog Input Module allows the connection of 4-20 mA output sensors to a fire alarm control panel (FACP). The module converts the sensor output to a common communication protocol that can be interpreted by the FACP for monitoring and display. There are numerous sensors available in the marketplace that communicate using a 4-20 mA output, including gas sensors, temperature sensors, air speed sensors, and more. The M500M-4-20 Module includes numerous safeguards and protective features to ensure trouble-free operation. The module accepts both 3-wire (device sink) and 2-wire configurations. The external power supply is isolated from the communication line. In addition, a 500 mA current limiter and a cutoff circuit protect the module’s electrical supply from short circuits. In the event of a short, the output voltage will cycle within safe limits until the short is removed. The output signal is sampled and filtered for transients and noise prior to passing the signal on to the FACP. If the current running through the sensing circuitry exceeds 25 mA, the output voltage will shut down and the short protection process will begin. As with all of the System Sensor intelligent modules, the M500M-4-20 Analog Input Module is rigorously designed and tested for electromagnetic compatibility and environmental reliability, in most cases exceeding industry standards. The device is equipped with a panel-controlled red LED for local status indication. The standard SEMS terminals will accept wiring from 18ga to 12ga (AWG). Agency Listings M500M-4-20 Module Specifications General Specifications Operating Voltage Communication Line Loop Impedance Temperature Range Relative Humidity Shipping Weight Dimensions Specifications, M502M Standby Current External Power Supply External Supply Standby Current External Supply Sensor Current LED Current 15 to 32 VDC 40 Ω max. 14°F to 140°F (-10° to 60°C) 10% to 93% noncondensing 5.5 oz (156 g) 4.275 in W × 4.675 in H × 1.400 in D 700 µA max @ 24 VDC (one communication every 5 sec. with LED enabled) 12 to 28 VDC 10 mA @ 24 VDC (nominal - module only, does not include sensor current) 500 mA (maximum) 6mA (with LED latched on) 3825 Ohio Avenue • St. Charles, IL 60174 Phone: 800-SENSOR2 • Fax: 630-377-6495 ©2008 System Sensor. Product specifications subject to change without notice. Visit systemsensor.com for current product information, including the latest version of this data sheet. A05-0438-000 • 4/08 • #1887