Reliable pressure transmitter for Demanding Industrial Applications

Pressure transmitter solutions for demanding industrial applications. The DR3401 series 4-20mA Pressure Sensor with Anti-Interference reliable performance.

The 3 PM Pressure Drop: A $2,000/Month Mystery Solved

Every morning at 9 AM, our pressure readings were perfect. But by 3 PM, they’d drop 15%, costing us $2,000 monthly. The VFD ramp-up was smooth, so the issue had to be elsewhere.

The Hidden Physics of 4-20mA Signals

Standard 4-20mA loops are robust, but in VFD-heavy environments, electromagnetic interference (EMI) can corrupt the signal. Our lab tests showed accuracy dropping by 12% post-ramp-up due to induced noise. The transmitter’s internal electronics were picking up EMI from the VFD cables, causing the drift.

Why a General Purpose Pressure Transmitter Failed

We initially used a general purpose pressure transmitter, but it lacked adequate shielding. Temperature logs revealed a consistent correlation: every VFD speed increase caused a proportional pressure drop. The issue wasn’t the pressure—it was the signal.

The Solution: A Standard 4-20mA Pressure Sensor with Anti-Interference

We installed the DR3401, an industrial pressure transmitter designed for harsh environments. Its strong anti-interference capability filters out EMI, maintaining signal integrity. Within days, the drop-off vanished. Response time improved from 200ms to 50ms, and accuracy stayed within ±0.1%.

Key Specifications

• Standard 4-20mA analog output
• Wide pressure range options
• Compact industrial design
• Strong anti-interference capability
• Long-term stability

Does your pressure transmitter ensure seamless integration with your control system’s 4-20mA expectations? If you’re seeing unexplained drift, it might be time to evaluate your signal chain.

[Download the DR3401 datasheet] to see how it handles EMI in VFD environments.

Tags: #pressuretransmitter #DR3401