4-20mA to LoRaWAN: How DR-LR2000 Saved $40,000 in Remote Monitoring Costs

Remote pipeline monitoring can become expensive when every new measurement point requires cables, trenching, power infrastructure, and regular site visits. In our case, an existing 4–20mA pressure sensor was already providing the information we needed, but the remote location made it difficult and expensive to connect that signal to our monitoring system. Instead of replacing the sensor or installing new communication cables, we used a 4-20mA to LoRaWAN solution to bring the existing measurement point into our wireless monitoring network.

The Problem: A Filter Was Getting Worse Between Maintenance Visits

We noticed that the pressure drop across a pipeline filter was steadily increasing, but our maintenance calendar indicated that the filter was still within its scheduled service interval. The difference between the scheduled maintenance cycle and the actual pressure trend suggested that the filter condition was changing faster than expected.

The problem was not the pressure sensor itself. The existing sensor already produced a standard 4–20mA output. The challenge was getting that measurement from a remote location back to the monitoring system without installing a new communication cable.

At a conventional site, extending the signal might require new wiring, cable trays, conduit, trenching, or other infrastructure. For a remote pipeline installation, those costs can quickly exceed the cost of the measurement device itself.

We needed a way to keep the existing sensor while adding wireless communication.

Turning an Existing 4–20mA Sensor into a Wireless Sensor

The DR-LR2000 LoRaWAN Data Acquisition Module was designed for exactly this type of application. It accepts a standard 4–20mA analog signal and converts the measurement into LoRaWAN wireless data.

This means an existing pressure transmitter, level transmitter, or other 4–20mA sensor does not necessarily need to be replaced simply because the monitoring infrastructure needs to become wireless.

With the DR-LR2000 installed between the existing sensor and the wireless network, the pressure measurement could be transmitted remotely through LoRaWAN.

This approach gave us a practical way to modernize an existing measurement point without redesigning the entire instrumentation system.

Why 4-20mA to LoRaWAN Was More Practical Than New Cabling

For remote industrial sites, the biggest challenge is often not measurement. It is communication infrastructure.

Installing a new cable to a remote pipeline monitoring point can require excavation, trenching, conduit, cable protection, installation labor, testing, and ongoing maintenance. If several measurement points are distributed across a large site, the infrastructure cost becomes even greater.

A 4-20mA to LoRaWAN architecture changes the equation. The existing 4–20mA sensor remains in place, while the DR-LR2000 provides the wireless connection to the LoRaWAN network.

Instead of building a dedicated wired communication path to every remote sensor, the measurement can be transmitted wirelessly over a long distance.

For our pipeline application, this significantly reduced the amount of new infrastructure required.

Long-Range Wireless Monitoring for Remote Sites

The DR-LR2000 supports LoRaWAN 1.0.3 Class A and is designed for low-power industrial data acquisition applications.

Under suitable line-of-sight conditions, the transmission range can reach up to 10 km. This makes the module particularly useful for remote pressure monitoring, pipeline monitoring, tank monitoring, environmental monitoring, and other distributed measurement applications.

Its receiver sensitivity is specified at up to -138 dBm, helping maintain communication in challenging long-range deployments.

The actual communication distance will depend on terrain, antenna installation, obstacles, interference, gateway placement, and local regulations, but the long-range characteristics of LoRaWAN make it well suited to applications where traditional wired communication is expensive or difficult to install.

Accurate Conversion of 4–20mA Signals

Wireless communication is only useful if the original measurement can be captured accurately.

The DR-LR2000 provides a 4–20mA analog input for connecting compatible industrial sensors. Its specified sampling accuracy is ≤0.01mA, allowing small changes in the sensor signal to be captured and transmitted to the monitoring system.

For our pipeline filter application, this meant we could monitor changes in differential pressure over time instead of relying solely on scheduled maintenance intervals.

The pressure trend became a useful indicator of actual filter condition.

12V Output for External Sensors

Another useful feature of the DR-LR2000 is its 12V power output for external sensors.

This simplifies installation when the connected sensor requires an external power supply. Instead of installing a separate power source at the measurement point, the data acquisition module can provide power to a compatible external sensor.

For remote installations, reducing the number of separate components can simplify wiring, installation, and maintenance.

Reliable LoRaWAN Communication

The DR-LR2000 supports LoRaWAN 1.0.3 Class A and OTAA activation, making it suitable for integration into standard LoRaWAN network architectures.

The Class A operating mode is particularly appropriate for battery-powered remote monitoring because the device primarily communicates when transmitting its scheduled measurement data and opens receive windows after transmission.

This allows the module to operate with relatively low power consumption while still providing regular measurement updates to a remote monitoring platform.

From Scheduled Maintenance to Condition-Based Monitoring

Before installing the DR-LR2000, our maintenance strategy relied heavily on scheduled inspection intervals. The filter would be checked according to the maintenance calendar, even though its actual condition could change significantly between visits.

After adding remote measurement, the pressure trend could be monitored continuously without sending a technician to the site for every inspection.

This changed the way we approached maintenance.

Instead of asking, “Is it time to inspect the filter?” we could ask, “Is the pressure trend indicating that the filter needs attention?”

That distinction can make a significant difference for remote industrial assets.

$40,000 Saved by Avoiding New Infrastructure

The financial benefit came from two areas.

First, we avoided the cost of installing new wired communication infrastructure to the remote measurement point. There was no need to trench a long cable route simply to transport the existing 4–20mA signal.

Second, remote monitoring reduced unnecessary maintenance trips. Instead of visiting the site simply to collect measurements or confirm operating conditions, the pressure data could be reviewed remotely.

By combining the existing 4–20mA sensor with LoRaWAN communication, we estimated that the project avoided approximately $40,000 in infrastructure and unnecessary maintenance costs.

More importantly, we gained continuous visibility into the pressure trend without replacing the existing sensor network.

Where 4-20mA to LoRaWAN Makes Sense

A 4-20mA to LoRaWAN solution can be particularly useful when an industrial site already has conventional analog sensors but needs to add wireless connectivity.

Typical applications include:

• Remote pipeline pressure monitoring
• Filter condition monitoring
• Tank level monitoring
• Water and wastewater systems
• Pump station monitoring
• Environmental monitoring
• Agricultural and irrigation systems
• Oil and gas infrastructure
• Remote industrial equipment
• Distributed process monitoring

The concept is simple: keep the existing 4–20mA measurement technology and add long-range wireless communication where running new cables is impractical.

DR-LR2000 Key Specifications

• 4–20mA analog input
• LoRaWAN 1.0.3 Class A
• Up to 10 km line-of-sight transmission range
• Receiver sensitivity up to -138 dBm
• Sampling accuracy up to ≤0.01mA
• 12V power output for compatible external sensors
• OTAA activation
• Industrial wireless data acquisition
• Suitable for remote monitoring applications
• Operating temperature: -45°C to +85°C

Modernize Existing Sensors Without Rebuilding the Network

One of the biggest lessons from this project was that wireless modernization does not always require replacing the existing instrumentation.

If an industrial sensor already provides a standard 4–20mA output, the measurement itself may already be perfectly suitable. The real limitation may simply be how that signal is transported from the remote site to the monitoring system.

A 4-20mA to LoRaWAN module provides a practical bridge between conventional industrial instrumentation and modern wireless monitoring.

This allows companies to extend the life of existing sensors while adding remote data access, reducing wiring requirements, and improving visibility into distributed assets.

Conclusion: From 4–20mA Sensors to Wireless Monitoring

Our pipeline monitoring problem initially looked like a maintenance scheduling issue. In reality, we lacked continuous visibility into the pressure trend at a remote location.

The DR-LR2000 allowed us to keep the existing 4–20mA pressure sensor while adding LoRaWAN wireless communication. With long-range transmission, industrial analog signal acquisition, external sensor power, and low-power LoRaWAN communication, the module provided a practical way to connect an existing measurement point to a remote monitoring system.

The result was more than $40,000 in avoided infrastructure and maintenance costs, while our team gained better visibility into the actual condition of the pipeline filter.

If your remote sensors already use 4–20mA, you may not need to replace them to start collecting data wirelessly.

You may simply need to make the existing signal wireless.

How many of your remote 4–20mA sensors could be connected to your monitoring system without installing another kilometer of cable?

Tags: #LoRaWANdataacquisition #wireless4-20mAconverter #IoTpressuremonitoring #DR-LR2000