The Signet Power Module works with the 8900 Multi-Parameter Controller. One power module is required to build a functional 8900. The power module is offered For universal 100/240 VAC or 12 to 24 VDC (This module can be powered by optional external relays (see ordering information For more details). The Signet 8900 Multi-Parameter Controller takes the concept of modularity to the extreme. 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. To build a functional 8900 controller, choose the base unit (W2T127899), power module, and input/output (I/O) module. Configure the system by selecting either two, four, or six input channels which accepts any of the Signet sensors listed below, 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. Links to the base unit and additional products can be found at the bottom of the page. For additional information about configuring the base unit, click the datasheet option above.