Common Troubleshooting for 2-wire 4-20ma Pressure Transmitter

The two-wire 4-20mA pressure transmitters are widely used in industrial applications like water tanks, oil pipelines, hydraulic and HVAC, etc. here are the most common faults and solutions for 2-wire 4-20ma Pressure Transmitter.

It is a typical usage of two-wire 4-20mA pressure transmitters for most customers showed in figure 1. After the pressure transmitter is powered on, the loop current is proportional to the pressure to generate a 4-20 mA signal by collecting the pressure. The current flow through the sampling resistor (typical 100 Ω, 250 Ω) which connects serially with the loop, and then it is converted to a voltage signal used for the back-end acquisition system. Generally, the sampling resistors will be integrated into the acquisition device.