The #1 Mistake People Make with Current Sensors & Transmitters

Why It Matters

Correctly distinguishing sensors from transmitters ensures accurate monitoring, reduces downtime, and unlocks energy‑saving opportunities for industrial and commercial facilities.

Key Takeaways

• Current sensors act as binary on/off switches for flow detection.
• Transmitters provide proportional analog output, measuring exact current draw.
• Sensors suit status verification; transmitters enable energy monitoring and predictive maintenance.
• Choose device based on need: simple run status vs detailed amp measurement.
• Using both together optimizes BAS retrofits: status sensor plus transmitter for trimming.

Summary

The video explains the common confusion between current sensors and current transmitters, two clamp‑on devices used in building‑automation and industrial control systems.

A current sensor functions as a binary switch: it clamps around a conductor and trips when current exceeds a set threshold, delivering a simple on/off signal. In contrast, a current transmitter measures the actual amperage and converts it to a proportional analog output—typically 4‑20 mA or 0‑10 V—sent back to a controller for real‑time data.

Reed McLaren highlights practical use cases: sensors verify that a fan or pump is running, while transmitters enable energy monitoring, load trending, and predictive maintenance by flagging abnormal current draws. He also advises installing both—a sensor on a supply fan for status and a transmitter on a chiller motor for amp‑trimming.

Choosing the right device prevents costly re‑orders, improves system reliability, and gives facilities managers actionable data to reduce energy waste and anticipate equipment failures.

Original Description

In the latest episode of Controls Desk, Reid McClearen breaks down the key difference between current sensors and current transmitters—two devices that are often confused but serve very different purposes. A current sensor provides a simple on/off signal to confirm whether equipment is running, while a current transmitter delivers real-time data on how much current is being used, making it ideal for monitoring and diagnostics. Understanding when to use each can save time, prevent mistakes, and improve overall system performance.

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𝐁𝐥𝐨𝐠𝐬: https://www.stromquist.com/blog

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