ECM2 Electrical Conductivity Monitor

The ECM2 monitor is a robust EC monitoring unit designed for accurate and dependable conductivity measurement in greenhouse and irrigation applications. It combines a clear local display with analogue signal outputs and relay functionality, making it well suited to both monitoring and control duties within a wider system. With an electrically isolated conductivity input, independently adjustable high and low alarm thresholds, and a durable polycarbonate enclosure with a clear hinged lid, it is built for practical day-to-day use in demanding environments. The IP54-rated housing helps protect the unit when closed, while the separate lower cover keeps electrical connections neatly accessible for installation and servicing.

Conductivity Display

The built-in liquid crystal display provides a clear reading of conductivity from 0 to 10 mS cm⁻¹, with a resolution of 0.01 mS. Readings can be checked easily through the clear front lid, allowing operators to monitor conditions without opening the enclosure.

Alarm Outputs & Alarm Thresholds

High and low alarm thresholds can be set independently, giving the unit flexibility for both warning and control functions. When a threshold is exceeded, the front panel alarm lamp is activated along with a two-pole relay output. In practice, one relay pole can be used to inhibit dosing, while the other can trigger an external alarm or control response.

Electrode Input

The monitor accepts conductivity electrodes with cell constants of 1, 2, 5 or 10, making it suitable for a range of installation requirements. The electrode input is electrically isolated from the ECM2 outputs, helping maintain reliable and stable measurement performance.

Signal Outputs

The ECM2 provides both 4–20 mA and 0–5 V outputs, corresponding to the full 0 to 10 mS range. This allows straightforward integration with compatible control systems, displays and monitoring equipment.

Temperature Compensation Input

When connected to the ECE1, which includes a built-in temperature probe, the monitor can automatically compensate conductivity readings to 25°C. This helps improve consistency where liquid temperature varies. Where fluid temperature remains stable, temperature compensation may not be essential.

Electrode Calibration

A front panel adjustment allows the electrode slope to be altered for calibration against a known standard. This gives installers and operators a practical way to maintain measurement accuracy over time.

Technical Specification

Electrical supply

120 or 240 volts AC, 12VA

Analogue output

4–20mA and 0–5 volt corresponding to 0–10 mS

Relay output

2 pole changeovers rated 5A at 240 volt AC

Dimensions

220mm wide x 230mm high x 126mm deep

Accurate EC measurement with clear display

Provides reliable conductivity readings from 0 to 10 mS with easy on-site visibility.

Isolated input for stable performance

Electrically isolated electrode input helps ensure consistent and dependable measurements.

Configurable high and low alarms

Independent thresholds allow precise control or alerting based on conductivity levels.

Relay output for control integration

Two-pole relay can inhibit dosing or trigger external alarms when limits are exceeded.

Flexible system connectivity

4–20 mA and 0–5 V outputs enable straightforward integration with greenhouse control systems.

Optional temperature compensation

Supports automatic correction to 25°C when used with a compatible temperature probe.

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FAQs

What is an EC monitor used for in greenhouse systems?

An EC monitor measures the electrical conductivity of water or nutrient solution, helping growers manage fertiliser concentration and maintain consistent crop conditions.

Can the ECM2 be used to control dosing systems?

Yes. The relay outputs and adjustable alarm thresholds can be used to inhibit or trigger dosing systems based on conductivity levels.

Does the ECM2 require temperature compensation to be accurate?

Not always. It can operate without temperature compensation if the liquid temperature remains stable, but connecting a temperature probe improves accuracy where temperatures vary.