Submersible water quality sensors with 4–20 mA output, built to wire straight into a datalogger, telemetry unit or PLC rather than a handheld meter. These are the sensors for continuous unattended monitoring — a permanent station in a stream, a lift station, a pond or a canal.

What each sensor is for

• Dissolved oxygen (WQ401) — the parameter that moves fastest and matters most for aquatic life. Standard for stream health work, aquaculture ponds and aeration control.
• pH (WQ201) — supplied on 25 ft of cable. The electrode is the wear part and is replaceable, so the sensor body outlives several electrodes.
• Conductivity — a proxy for total dissolved solids and the quickest way to see saltwater intrusion, road-salt runoff or an illicit discharge.

Ordering notes

• These are 4–20 mA sensors. Confirm your logger or controller has a current input, or budget for a signal conditioner.
• pH electrodes have a finite service life regardless of use — a spare on the shelf keeps a station from going dark mid-season.
• Cable is factory-terminated at the stated length. Splicing a submersible sensor cable in the field is a common cause of drift and failure.

Applications

Surface water and stream monitoring, wastewater and lift stations, stormwater outfalls, aquaculture and hatcheries, irrigation canals, and any telemetered water quality station.

Contact us with your logger model and we will confirm wiring and scaling.