$60,000 in Savings: How DR3702 Solved Our Measurement Errors
Why Did Our Hydraulic Press Suddenly Start Producing Out-of-Spec Parts?
During a night shift, the hydraulic press began cycling slower than usual. The gauge showed normal pressure, and the SCADA system indicated everything was within limits. Yet, every part coming off the line was out of spec. This discrepancy cost us $60,000 annually in wasted materials and downtime. We needed to find the root cause fast.
The Hidden Physics Behind 4-20mA Signal Degradation
Our investigation revealed that common-mode noise was corrupting the 4-20mA signal. A 4-20mA loop is a current source, which makes it inherently susceptible to electromagnetic interference (EMI). Long cables act as antennas, picking up noise from nearby motors and VFDs. As a result, the EMI induces voltage fluctuations that cause drift at the PLC input card. Consequently, the readings appeared normal but were actually inaccurate. This is a classic problem in industrial environments where signal integrity is critical.
How DR3702 Solved Our Measurement Errors with RS485 Differential Signaling
We replaced our existing transmitters with DR3702 digital pressure gauges. The key improvement was switching from 4-20mA to RS485 differential signaling. Unlike single-ended 4-20mA, RS485 rejects common-mode noise entirely. Therefore, the signal remains accurate even in high-EMI environments. Additionally, the DR3702 offers both 4-20mA and RS485 outputs, providing flexibility for integration with existing systems. Its LCD display with backlight and 5-digit readout allows operators to see precise values at a glance. Moreover, the device features nonlinear correction, which compensates for sensor nonlinearity, ensuring accuracy across the entire pressure range. The DR3702 is powered by DC24V and offers multiple engineering unit display options. It also supports active or passive migration, making it adaptable to various process conditions. Finally, its durable housing withstands harsh industrial environments.
How Did Switching to DR3702 Digital Pressure Gauge Save Us $60,000 Annually?
After installation, part quality improved dramatically. We eliminated the false readings caused by EMI, which reduced scrap and rework. Specifically, we saw a 30% reduction in downtime and a $60,000 annual savings. The DR3702’s robust design and reliable performance have made it a cornerstone of our quality control process. For more on EMI mitigation, see [Control Engineering’s guide](https://www.controleng.com).
Key Specifications
- Output signal: 4-20mA or RS485
- LCD display with backlight
- 5-digit display
- DC24V powered
- Multiple engineering unit display options
- Nonlinear correction
- Active or passive migration
- Durable housing for industrial environments
Have You Experienced Similar Issues with Common-Mode Noise?
How many transmitters have you replaced when the real problem was common-mode noise? Consider evaluating your signal integrity before swapping hardware. The DR3702 might be the solution you need.
🔧 Need a Reliable Digital Pressure Gauge?
Contact our engineering team for a free consultation on DR3702 solutions tailored to your application.
Tags: #RS485pressuretransmitter #4-20mApressuregauge #EMIresistantpressuresensor #digitalpressuregaugewithRS485 #DR3702
