PIE 311Plus RTD Milliamp Calibrator

The PIE 311Plus RTD Milliamp Calibrator is a powerful troubleshooting tool engineered to identify hidden problems in 4–20 mA loops that traditional calibrators often miss. Designed for use in the shop, plant, or field, the 311Plus allows technicians to calibrate directly in °C or °F, test RTD sensors, and diagnose loop issues caused by ground faults, moisture, or corrosion.

Unlike basic loop calibrators, the PIE 311Plus not only powers a 2-wire transmitter but also displays both total loop current and uncontrolled leakage current, making it an essential diagnostic instrument for maintenance and commissioning work.

Features and Performance

• Ground Leak Detection Technology
  Instantly identifies uncontrolled current caused by ground faults, moisture ingress, or insulation breakdown.

• RTD Measurement & Temperature Calibration
  Measure RTD sensors and calibrate directly in °C and °F without conversion.

• 4–20 mA Loop Diagnostics
  Simultaneously powers the loop while displaying mA output, percent of span, and leakage current.

• Automatic Output Stepping
  Enables fast zero, mid-point, and span calibration.

• 2-Wire Transmitter Powering
  Supplies loop power while monitoring transmitter performance.

• Field-Ready Design
  Compact, rugged, and easy to carry for plant and field troubleshooting.

• Universal Compatibility
  Works with all standard process instruments using 4–20 mA signals.

Why You Should Buy It

• Prevent unnecessary transmitter replacement

• Quickly locate hidden loop problems after rain or washdowns

• Diagnose zero shift caused by leakage current

• Reduce downtime and maintenance costs

• Trusted PIE design focused on real-world troubleshooting

FAQ – PIE 311Plus

Q: What makes the PIE 311Plus different from standard loop calibrators?
A: It measures uncontrolled leakage current in addition to total loop current, allowing detection of ground faults and moisture issues.

Q: Can it power a 2-wire transmitter?
A: Yes, it powers the loop while simultaneously monitoring mA output and leakage.

Q: Does it measure RTD sensors directly?
A: Yes, RTD measurement and temperature calibration in °C and °F are built in.

Q: Is it suitable for field use?
A: Absolutely. The rugged design and hands-free case make it ideal for plant and field environments.