Maxitrol SC25S-B Signal Conditioner Input Output Temperature & Pressure Controls - 4-20mA 0-10VDC 0-20VDC

The Maxitrol SC25S-B is an analog signal conditioner designed to convert 4-20 mA or 0-10 VDC control signals to a 0-20 VDC output level capable of driving one or more Selectra modulating gas valves. This track-mounted signal conditioner is ideal for direct or indirect-fired gas applications in commercial HVAC and industrial combustion systems.

Key Features:

• Dual input capability: 4-20 mA or 0-10 VDC selectable via 3-position DIP switch
• 0-20 VDC output for driving Selectra modulating gas valves
• Built-in minimum and maximum discharge air temperature monitoring and limits
• Adjustable low fire start timer option
• Automatic temperature override protection to maintain safe discharge air temperatures
• Compatible with TS194 (Q) sensor with MT mixing tube for temperature sensing
• Field installable on existing equipment or can be specified for new installations

The SC25S-B continuously monitors discharge air temperature and will automatically override the input control signal if temperatures approach set limits, reducing or increasing DC voltage output to maintain safe operating conditions. When discharge air temperature is within normal range, output is directly proportional to the input control signal. This unit replaces the SC20C-B6S2 and R64420 models.