Water quality controllers and transmitters for single and multi-parameter loops
Single-channel and multi-channel water quality controllers — 3-inch and 4-inch LCD field transmitters and 4–8 channel multi-parameter touchscreen panels. RS485 Modbus and Modbus RTU output, dual 4–20 mA, RS232 service port. Drive any InstroDirect pH, conductivity, DO, turbidity, or chlorine sensor.
3 SKUs in stockModbus RTU + 4–20 mASingle & multi-parameter2–4 week delivery
IDWQ-1000Single-Channel Controller — 3″ LCD4–20 mA · Modbus RTUView ›IDWQ-2000Single-Channel Controller — 4″ LCDDual 4–20 mA · RS485 · RS232View ›IDWQ-3000Multi-Parameter Touchscreen Controller4–8 channels · touchscreenView ›
Single-channel vs multi-parameter — which to choose
Specify single-channel transmitters (IDWQ-1000 or IDWQ-2000) when each parameter has its own field-mounted controller — the typical layout for distributed wastewater plants and multi-zone water utilities. The IDWQ-1000 is the bare-bones unit with a 3-inch LCD and one 4–20 mA output. The IDWQ-2000 adds a larger 4-inch display, dual analog outputs (one for the primary measurement, one for temperature compensation or alarm), and both RS485 and RS232 communication.
Specify the multi-parameter IDWQ-3000 when consolidating 4 to 8 sensors into a single panel-mount touchscreen — typical for compact treatment skids, OEM water-treatment package plants, and centralised plant rooms. Each channel is independently configurable for pH, conductivity, DO, turbidity, free chlorine, ORP, or other Modbus-output sensors.
Modbus RTU integration
All three controllers expose Modbus RTU registers for sensor readings, alarm state, and calibration status. Documented register maps available on request — direct integration into Allen-Bradley CompactLogix, Siemens S7-1200/1500, Schneider Modicon, or any other Modbus-capable PLC or SCADA platform.
Australian compliance
Controllers used in drinking-water service align with AS/NZS 4020:2018 (products in contact with drinking water). Wastewater EPA-reporting installations meet state-EPA documentation requirements when paired with documented calibration logs.
Who specifies InstroDirect controllers?
Water and wastewater utilities
IDWQ-2000 single-channel field transmitters at remote pump stations and treatment skids; IDWQ-3000 multi-parameter on the main control room.
OEM water-treatment package plants
IDWQ-3000 touchscreen as the central operator HMI consolidating up to 8 sensor channels.
Food & beverage plants
IDWQ-1000 single-channel on CIP rinse-water verification, IDWQ-3000 multi-parameter for fermenter and process-line monitoring.
Request a quote
Send us the parameter list, output requirements, and mounting type. Contact our technical team or call 0403 082 383.
Showing all 3 resultsSorted by popularity
