Wellheads, pipelines and remote production sites.

Oil and gas SCADA puts harder requirements on a controller than almost any other industry: ambient temperature swings from −40 °C to +50 °C on a single network, primary communication paths drop out without warning, and a single missed alarm — high pressure, low flow, or a pilot light failure — can take a wellhead off-line for days. AutoLog® was designed against these constraints from the beginning.

Typical wellhead applications include casing and tubing pressure monitoring, separator level supervision, choke position, gas-detection alarms, and emergency-shutdown interlock supervision. Pipeline station deployments add flow metering, custody-transfer support, valve position and remote-actuated valve control, and pig-passage detection. Production-facility AutoLog systems supervise compressors, glycol units, separators and metering skids — usually integrated with the operator’s existing DCS over Modbus.

Communication design is part of the engineering. Where GSM coverage exists we use it as primary; where it doesn’t, AutoLog radio modems on 138–950 MHz bands provide line-of-sight links up to 40 km. SMS over GSM is the standard fallback for high-priority alarms when data sessions drop. Several deployments use TETRA as the primary channel for public-safety integration. Satellite is supported for the most remote sites.

The operating range — verified −30 °C to +70 °C — has been proven in real deployments from northern-Finnish gas-gathering networks to Saharan crude pipelines. The same RTU goes in either place.