Pump Status from Relay, Flow and Pressure

Who it’s for

Plant operators, maintenance engineers, and SCADA dashboard authors asking “is the pump actually running?”, “is the motor on but the flow is dead?”, “is the compressor pressurised but idle?” — when “is it on?” depends on three signals working together rather than one.

What it does

Reads the latest relay, flowRate, and pressure telemetry from the device and emits one human-readable state string — “running”, “dry-run-fault”, “idle-pressurized”, or “idle” — based on which combination of inputs is matched. The output recomputes on every update.

How to customize

• To use this on different device keys — change the Time series key on each argument (e.g. relay → motorRunning, flowRate → flowLpm, pressure → outletPressure).
• To rename the output — open the script and replace state in the return object with the key your downstream dashboards and alarms expect (e.g. pumpState, compressorStatus).
• To change what counts as running, idle, or fault — open the script and adjust the branch thresholds or polarity. Add new branches if your equipment has additional states.
• To timestamp the state change with the latest input reading instead of server time — the script currently returns the output key at the top level, so the record uses server time. Wrap the return in a values envelope keyed by ctx.latestTs (resolves to the max across all non-default arguments) to use the most recent input timestamp instead.
• To use a different fallback when no data has arrived — change Default value on each argument (relay defaults to false, numeric inputs to 0).