The ST100 series thermal mass air/gas flowmeter from Fluid Components International (FCI) is now rated for safety integrity level (SIL) 1 compliant service. FCI's SIL-compliance rating for the ST100 flowmeter has been documented in a failure analysis report with FMEDA techniques by Exida, an accredited global functional safety certification company. It has been classified as a Type B subsystem in accordance with IEC 61508-1 with a hardware failure tolerance of 0. The probability of failure on demand meets SIL-1 capability standards. SIL ratings provide a key assurance of confidence that safety-rated equipment has been tested and shown to prevent dangerous failures and to control them in the event they occur. FCI's new SIL-1 safety compliance assures its customers that the third-party testing organization has tested the flowmeter, and when the product is in use, the process risk is reduced to the designated level. The ST100 provides 4-20 mA analog, frequency/pulse, alarm relays, and digital bus communications such as HART, Fieldbus, Profibus or Modbus. Should a plant's needs change over time or an upgrade be desirable, the flowmeter adapts as necessary with a plug-in card replacement that can be changed out by plant technicians in the field.