Apparatus must be installed in accordance with National Electrical Code. 2) FMRC Approval of the RS232C Data Output option applies only if used as a printer port and the apparatus connected to the controller does not use or generate greater than 250 Vrms. 3) FMRC Approval for Hydrogen Sulfide Sensor Module applies to Model 5100-05 electrochemical cell only. Model 5100-01 solid state sensor is not approved. 4) FMRC Approval allows the presence of MODBUS firmware in the Sentry controller but does