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Controllers & Transmitters

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InstroDirect Controllers & Transmitters

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 3″ LCD, 4–20 mA, Modbus RTU. Wall-mount field transmitter for single sensor loops.IDWQ-2000Single-channel 4″ LCD, dual 4–20 mA, RS485 + RS232. Field transmitter with redundant outputs.IDWQ-3000Multi-parameter touchscreen, 4–8 channels. Drive multiple sensors from a single panel-mount controller.2–4 wkDelivery from order confirmation across Australia
In-stock controllers and transmitters
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 ›
Specifying a water quality loop? Send us the parameter list (pH, conductivity, DO, turbidity, chlorine, ORP), output requirements (4–20 mA, Modbus, relays), and panel/wall mounting — we’ll spec the right controller with AU-backed lead time.Request a controller quote →

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.

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Multi-parameter touchscreen water quality controller 4-8 channels Australia — InstroDirect IDWQ-3000, alternative to Endress+Hauser Liquiline CM44R and HACH SC1000
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Multi-Parameter Water Quality Touchscreen Controller – 4–8 Channels

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InstroDirect IDWQ-3000 Multi-Parameter Water Quality Touchscreen Controller – 4–8 Channels. is a touchscreen multi-parameter water-quality controller available in three configurations: IDWQ-3000 (4. Open RS485 Modbus RTU, no sensor vendor lock-in. Alternative to Endress+Hauser Liquiline and HACH SC transmitter/controller families. AU technical support, on-site commissioning.
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InstroDirect IDWQ-3000 Multi-Parameter Water Quality Touchscreen Controller – 4–8 Channels. is a touchscreen multi-parameter water-quality controller available in three configurations: IDWQ-3000 (4. Open RS485 Modbus RTU, no sensor vendor lock-in. Alternative to Endress+Hauser Liquiline and HACH SC transmitter/controller families. AU technical support, on-site commissioning.
4-inch water quality controller dual 4-20 mA RS485 RS232 Australia — InstroDirect IDWQ-2000, alternative to Endress+Hauser Liquiline CM14 and HACH SC200
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Single-Channel Water Quality Controller – 4″ LCD, Dual 4–20 mA, RS485 + RS232

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InstroDirect IDWQ-2000 Single-Channel Water Quality Controller – 4″ LCD, Dual 4–20 mA, RS485 + RS232. is the upgraded 4-inch single-channel controller with dual 4–20 mA outputs, three 120 VAC / 24 VDC relays, RS485 + RS232 digital outputs, and a larger 144 mm × 144 mm panel footprint. Open RS485 Modbus RTU, no sensor vendor lock-in. Alternative to Endress+Hauser Liquiline and HACH SC transmitter/controller families. AU technical support, on-site commissioning.
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InstroDirect IDWQ-2000 Single-Channel Water Quality Controller – 4″ LCD, Dual 4–20 mA, RS485 + RS232. is the upgraded 4-inch single-channel controller with dual 4–20 mA outputs, three 120 VAC / 24 VDC relays, RS485 + RS232 digital outputs, and a larger 144 mm × 144 mm panel footprint. Open RS485 Modbus RTU, no sensor vendor lock-in. Alternative to Endress+Hauser Liquiline and HACH SC transmitter/controller families. AU technical support, on-site commissioning.
Single-channel water quality controller 3-inch LCD Australia — InstroDirect IDWQ-1000, alternative to Endress+Hauser Liquiline CM14 and HACH SC200
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Single-Channel Water Quality Controller – 3″ LCD, 4–20 mA, Modbus

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InstroDirect IDWQ-1000 Single-Channel Water Quality Controller – 3″ LCD, 4–20 mA, Modbus. is an entry-tier single-channel water-quality controller with a 3-inch 800×480 colour LCD, one 4–20 mA analog output, three SPDT relays, and RS485 Modbus digital output. Open RS485 Modbus RTU, no sensor vendor lock-in. Alternative to Endress+Hauser Liquiline and HACH SC transmitter/controller families. AU technical support, on-site commissioning.
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InstroDirect IDWQ-1000 Single-Channel Water Quality Controller – 3″ LCD, 4–20 mA, Modbus. is an entry-tier single-channel water-quality controller with a 3-inch 800×480 colour LCD, one 4–20 mA analog output, three SPDT relays, and RS485 Modbus digital output. Open RS485 Modbus RTU, no sensor vendor lock-in. Alternative to Endress+Hauser Liquiline and HACH SC transmitter/controller families. AU technical support, on-site commissioning.
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