Designing Remote Monitoring Devices for Harsh Environments

Environmental Testing

Remote monitoring devices are often deployed in environments that are unpredictable, unconditioned, and difficult to access. At ParemTech Inc., our PTLevel liquid level monitoring devices are installed in cisterns, water wells, tanks, basement sumps, and other infrastructure where exposure to extreme temperatures, elevated humidity, and seasonal environmental cycling is unavoidable.

The PTLevel is designed as a long-duration, battery-powered monitoring solution, with a two-year warranty, multi-year battery life using four AA batteries, long-range wireless communication up to 1 km, and an operating temperature range of −40°C to +85°C (−40°F to 185°F). The system is engineered to be weather resistant and capable of reliable operation in outdoor and unconditioned environments.

In these applications, reliability is not optional. A device failure can result in water outages, flooding, or costly emergency service calls, often in locations that are remote or unattended for extended periods of time. To ensure long-term performance under these conditions, we rely on controlled, repeatable environmental testing using a Tenney Twenty Environmental Chamber.

Overview of the PTLevel Monitoring System

The PTLevel is a battery-powered remote liquid level monitoring system designed for long-duration deployments with minimal user interaction. Typical installations include:

• Outdoor in harsh environments including high humidity

• Underground cisterns and wells

• High-humidity pump rooms

• Cold-climate installations exposed to sub-freezing temperatures, freezing rain, ice, snow…

Meeting these requirements requires extensive environmental validation beyond basic functional testing.

Why Environmental Chamber Testing Is Critical for Battery-Powered IoT Devices

Environmental chamber testing allows us to simulate years of seasonal exposure in a controlled laboratory environment. For battery-powered IoT devices like the PTLevel, temperature and humidity directly affect:

• Battery chemistry and discharge behavior

• Electronic component stability

• Sensor drift and accuracy

• Enclosure sealing and material performance

• Wireless signal reliability

Testing under controlled extremes allows us to identify failure modes early and validate design margins before products are deployed in the field.

The Tenney Twenty Environmental Chamber in Our Test Process

To support our testing requirements, ParemTech uses a Tenney Twenty Environmental Chamber, which provides the flexibility and precision needed for electronics and sensor validation.

Key specifications of the Tenney Twenty include:

Temperature range:

• −35°C to +200°C

• −35°C to +180°C with humidity enabled

• Humidity range: 20% to 95% relative humidity (RH)

This wide operating envelope allows us to conduct both extreme condition testing and long-duration soak testing under realistic environmental loads.

Low-Temperature Testing: Validating Cold-Weather Performance

Cold temperatures present one of the most challenging operating conditions for remote monitoring devices, particularly in northern climates.

Using the Tenney Twenty, we perform low-temperature testing down to −35°C, focusing on:

• Battery voltage stability and capacity loss

• Cold-start behavior after extended exposure

• Pressure sensor response and repeatability

• Mechanical effects such as material contraction and seal performance

Cold testing is essential for validating winter operation in unheated wells, cisterns, and outdoor installations where devices may remain dormant for long periods before transmitting data.

In 2024 we began evaluating potting a select line of our PTLevel products, the Deep Well PTLevels with stainless steel sensor. These would be our most robust devices, installed in the harshest conditions, and requiring the least amount of maintenance. With the feedback and information received from our environment testing, we were able to determine the best potting compounds to use, and curing times needed, for this enhancement.

High-Temperature Testing: Ensuring Stability in Hot Environments

High-temperature testing is equally important, especially for devices installed in:

• Utility rooms

• Pump houses

• Enclosures exposed to direct sunlight

• Harsh and hot weather systems in southern climates

Using the chamber’s high-temperature capability, up to +200°C (or +180°C with humidity), we evaluate:

• Electronic component derating margins

• Long-term enclosure material stability

• Sensor performance under thermal stress

• Battery safety and protection behavior

These tests help confirm that the PTLevel maintains performance and safety under elevated temperatures well beyond typical field conditions.

Humidity Testing: Simulating Damp and Condensing Environments

Many PTLevel installations are exposed to persistent moisture, including condensation and high ambient humidity. Using the Tenney Twenty’s 20%–95% RH humidity control, we conduct testing to assess:

• Seal integrity under high humidity

• Resistance to condensation-related failures

• Corrosion risk to electronic components

• Long-term sensor stability in damp environments

Humidity testing is especially important for underground installations where airflow is limited and moisture levels remain

Temperature and Humidity Cycling for Long-Term Reliability

Beyond static conditions, we also perform temperature and humidity cycling tests to simulate real-world seasonal transitions. These tests help identify:

• Fatigue-related material failures

• Seal degradation over time

• Drift in sensor calibration

• Performance changes caused by repeated thermal expansion and contraction

The repeatability of the Tenney Twenty allows us to correlate laboratory results with real-world field data collected from deployed devices.

Translating Chamber Data into Product Improvements

Environmental testing is not simply a pass/fail exercise. Data collected from the Tenney Twenty directly informs design decisions, including:

• Battery selection and power management algorithms

• Enclosure materials and sealing methods

• Firmware behavior during temperature extremes

• Installation recommendations for end users

This data-driven approach allows us to continuously improve the PTLevel product line while reducing long-term failure rates and warranty issues. Since we provide a 2 year warranty on all of our products, ensuring long term success of each device is imperative to our company’s success.

Environmental Testing as a Design Tool, Not a Checkbox

For remote monitoring and IoT devices, environmental testing should be integrated into the design process, not treated as a final compliance step. The ability to recreate extreme temperature and humidity conditions in a controlled environment enables faster iteration, better reliability, and greater confidence in field deployments.

The Tenney Twenty Environmental Chamber provides the precision, range, and repeatability required to support this level of engineering validation.

Conclusion: Shared Commitment to Product Reliability

At ParemTech, our goal is to deliver remote monitoring solutions that perform reliably in the environments where they are actually used, not just in ideal laboratory conditions. The Tenney Twenty Environmental Chamber plays a critical role in helping us validate that performance across extreme temperatures and humidity levels.

By combining real-world field feedback with controlled environmental testing, we are able to deliver a robust PTLevel product line designed for long-term reliability in demanding applications.

About ParemTech Inc.

ParemTech Inc. designs and manufactures remote liquid level monitoring solutions for cisterns, wells, tanks, rain water collection, chemical tanks, and basement sumps. Based in Canada, the company focuses on long-range wireless technology, battery efficiency, and rugged design for harsh environmental conditions.