SafeBoss - Model CTRL-FA and SafeBoss-CTRL-IS - Stand-Alone Controllers
This SafeBoss trademark designates our line of stand-alone controllers. Using one of our RM420i control modules, this handy wall mount unit is AC powered and has everyth8ng necessary for monitoring one 4-20 ma analog signal, whether from a gas sensor, air velocity sensor or whatever. The RM420i receives the signal and displays the value on its LCD display. There are two user settable trip points, with two threshold relays. Two DPDT buffer relays contained in the unit provide 10A contacts which the user can use for controlling other equipment. A 24VDC power supply provides power to the single sensor over a three conductor shielded cable, usually 14-20 AWG, enabling the sensor to be installed hundreds of feet from the controller.
If the sensor is in a hazardous area, i.e. Class 1, Div 1 area, an OSHA and MSHA-approved IS barrier can be installed in the panel to limit voltage and current to Intrinsic Safety levels. The fresh air controller is CTRL-FA-1, while the intrinsically safe version is CTRL-IS-1. OSHA-permissible.