The Model 4501-05 2-wire Hydrogen Sulfide Gas Detector from Sierra Monitor Corporation is a loop powered gas detector that provides the user with lower cost and easier installation and maintenance. This eliminates the need for separate power runs and associated power distribution and circuit protection for each device. 

The SMC 2-wire Hydrogen Sulfide Gas Detector provides the following features: 
 Low maintenance costs due to 180 day (six-month) calibration interval
 Low installation costs due to 4-20 mA 2-wire loop-powered design
 User-friendly operator interface with integral scrolling menu-driven LCD display for easy access to gas status, calibration instructions, adjustment of ranges and outputs and diagnostic information
 Performance confidence with FM approval for performance and area safety requirements
 Fast response time and high accuracy
 Durability of a stainless steel transmitter and sensor enclosure
 Non-intrusive calibration to enable calibration without declassifying the area
 Common signal output of 4-20 mA

Sierra Monitor Corporation