Stop Measurement Errors Now: How DR6421 Fixed Our Corrosive Liquids Nightmare

What SCADA Didn’t Tell Us About Our Corrosive Liquid Levels

The dip tape said empty. The bubbler said half full. $50,000 of product was missing—or was it? On that night shift, we faced a nightmare: a 50% discrepancy between two level measurement methods in our corrosive liquid storage area. The bubbler, submerged in hydrochloric acid, had developed a pinhole leak, causing erroneous readings. Meanwhile, the dip tape required manual insertion, risking chemical exposure and human error. We needed a reliable, non-contact solution—fast.

Calendar Days vs Chemical Attack: Why Traditional Sensors Fail

Ultrasonic level sensors operate by emitting sound pulses that reflect off the liquid surface. The time-of-flight is converted to distance. However, in corrosive environments, contact-based sensors like bubblers or hydrostatic probes suffer from material degradation. The bubbler’s tube corrodes, altering pressure readings. The DR6421 avoids this entirely: it mounts above the liquid, with no wetted parts. Thus, it eliminates corrosion and coating issues, ensuring consistent accuracy. Moreover, built-in temperature compensation corrects for speed-of-sound variations due to ambient changes, a common error source in open tanks.

How DR6421 Solved Our Corrosive Liquid Measurement Problem

After the incident, we installed DR6421 ultrasonic level sensors across all storage tanks and sumps. The non-contact ultrasonic level sensor mounts above the liquid—no submerged components. This design makes it ideal for corrosive or dirty liquids. We configured the 4-20mA output with adjustable range to match our tank heights. As a result, readings became consistent and reliable. The non contact level transmitter eliminated maintenance associated with wetted parts, saving us hours per week. Furthermore, the sensor’s suitability for open tank level measurement meant we could use it in our open-top sumps without modification.

$50,000 Saved: How Accurate Level Measurement Prevented Product Loss

Since switching to the DR6421 Ultrasonic Level Sensor, we have not experienced a single measurement error. The system paid for itself within three months by preventing product loss. Additionally, maintenance costs dropped by 80% because there were no wetted parts to replace. The built-in temperature compensation ensures accuracy even during seasonal temperature swings. Consequently, our inventory tracking is now precise, and we avoid costly write-offs.

Key Specifications

• Non-contact ultrasonic level sensor
• Mounts above liquid – no submerged components
• No wetted parts – ideal for corrosive or dirty liquids
• Suitable for open tanks, sumps, and basins
• 4-20mA output with adjustable range
• Built-in temperature compensation

What’s Your Take on This Technical Challenge?

Have you faced similar measurement errors in corrosive environments? How did you solve them? Share your experience below—we’d love to learn from your solutions.

Tags: #leveltransmitter #DR6421