Fix 4-20mA Signal Drift with RS485 Differential Signaling
Digital pressure gauge solutions for demanding industrial applications. The DR3702 series delivers reliable performance.
The Challenge
Every morning at 8 AM, the reading was different.
Every morning at 8 AM, the reading was different. Same process. Same sensor. This inconsistency puzzled many engineers until they realized that long cables used for 4-20mA loops acted as antennas, picking up electromagnetic interference (EMI). As these signals reached the PLC input card, drift in the readings became evident. The physics behind this issue is straightforward: current flowing through a wire induces an electrical field around it, and long wires amplify this effect, making them susceptible to external noise.
The DR3702 solves this problem by utilizing RS485 differential signaling, which rejects common-mode noise entirely. This design ensures that the data integrity remains unaffected by EMI, providing reliable readings even over longer cable runs.
Sensor drift or cable noise?
Technical Specifications
- High-precision digital pressure gauge with industry-leading accuracy
- Robust design for demanding industrial environments
- Multiple output options: 4-20mA, RS485, HART, LoRaWAN
- Wide operating temperature range for harsh conditions
- IP65/IP67/IP68 protection rating for demanding installations
Applications
The DR3702 is ideal for industrial automation, hydraulic and pneumatic pressure monitoring, oil and gas facilities, water treatment, and remote IoT monitoring.
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Tags: #digitalpressuregauge #IndustrialAutomation #PressureSensor #DR3702
