The DR3704 Advantage: High Speed Pressure Measurement

When Normal Pressure Data Misses a Critical Event

The night shift log looked normal. Yet the main transfer pump was destroyed. Our chemical plant faced an $85,000 replacement and cleanup bill. The control room showed normal pressure before the failure. However, the data did not explain what happened. The problem was a short pressure event that our existing system could not capture. We needed high speed pressure measurement to see what standard monitoring had missed.

Why Standard SCADA Monitoring Was Not Enough

Our PLC and SCADA systems were designed to monitor process trends. They were not designed to capture every rapid pressure change. Our SCADA system used a 500ms scan interval. A pressure spike could occur and disappear between two scans. As a result, the recorded pressure could look completely normal. Meanwhile, the pump and piping could experience a much higher instantaneous load. This problem can occur during rapid valve closures, pump starts, pump stops, or sudden flow changes. Hydraulic shock can also create short pressure spikes that remain invisible in slow process data. We needed to measure pressure much faster.

How DR3704 Improved High Speed Pressure Measurement

We installed the DR3704 Digital Pressure Gauge with Data Logger directly at the pump discharge. The DR3704 records pressure at 10ms intervals. This high-speed sampling provided a much more detailed view of rapid pressure changes. The device also operates independently from our plant network. Its battery-powered design allowed us to monitor the pump without depending on PLC or SCADA polling. The DR3704 supports pressure measurement up to 100 bar. Its IP66 protection also makes it suitable for demanding industrial environments. In addition, the instrument stores measurement records locally. Engineers can export the data through an SD card in CSV format for detailed PC analysis. This gave us something our existing system could not provide: a complete record of fast pressure changes at the measurement point.

The Pressure Spike We Could Finally See

The recorded data revealed a clear pattern. A sharp pressure spike appeared every time an automated valve closed. The event happened too quickly for our existing SCADA system to record it. The repeated pressure spikes placed additional stress on the pump system. Over time, that stress contributed to repeated pump seal failures. We then adjusted the valve closing speed. After the adjustment, the pressure spikes dropped significantly. Unexpected pump seal failures also fell by 40% across the manufacturing unit. More importantly, we avoided another potential $85,000 equipment failure and cleanup event.

Why High Speed Pressure Measurement Matters

Average pressure does not always tell the full story. A system may operate at a normal pressure for most of the day. However, a short pressure spike can still damage pumps, valves, seals, and piping. That is why high speed pressure measurement can be valuable during troubleshooting. Instead of looking only at process trends, engineers can examine rapid changes in pressure. This makes it easier to identify the actual cause of intermittent failures. The DR3704 provides this capability without requiring changes to the existing SCADA architecture.

Applications for Fast Pressure Measurement

High-speed recording can help investigate many dynamic pressure problems:

• Hydraulic shock
• Rapid valve closures
• Pump start and stop events
• Pressure spikes
• Sudden flow changes
• Cavitation-related problems
• Intermittent equipment failures
• Unexpected pressure fluctuations
  For these applications, slow polling can leave important gaps in the data. A local recording device can capture what happens between SCADA measurements.

DR3704 Key Specifications

• 10ms pressure recording interval
• Built-in data logging
• SD card storage
• CSV data export
• High-accuracy pressure measurement
• Battery-powered operation
• 3–5 year battery life
• IP66 protection
• Large memory capacity
• Pressure measurement up to 100 bar

From Normal Data to a Clear Diagnosis

At first, our pump failure made little sense. The SCADA trend looked normal. The pressure gauge also showed normal readings. Yet the pump continued to fail. The DR3704 gave us a different level of visibility. Its 10ms recording interval captured the rapid pressure spike. We identified the automated valve as the source of the problem. After changing the valve closing speed, the pressure spikes decreased and pump reliability improved. The experience taught us an important lesson: Normal process data does not always mean normal system behavior.
When equipment fails without an obvious cause, the missing information may be hiding between your normal SCADA readings. How fast does your current pressure monitoring system need to be to capture the events that matter?
Learn more about the DR3704 and its high-speed pressure recording capabilities.

Tags: #pressuredatalogger #digitalpressuregaugewithlogging #SCADAtransientcapture #DR3704