Each 8900 Controller is field-commissioned with the users-specified combination of inputs, outputs, and relays using simple-to-install modular boards into the base unit. Configure the system by selecting either two, four, or six input channels which accepts many of the Signet sensors and/or other manufacturer's sensors via a 4 to 20 mA signal converter. To complete your unit, choose a power module with universal AC line voltage or 12 to 24 VDC.Analog output and relay modules are also available. The 8900 Controller will support up to four additional relays via an external relay module. Digital input to the Signet 8900 Multi-Parameter Controller enables longer cable runs and simplified wiring with minimal noise interference. The menu system can be programmed to display in multi-languages, including English, German, French, Spanish, Italian, and Portuguese.