Emerson Epro A3311/022-000 Speed and Key Phase Transmitter

Overview

The Emerson Epro A3311/022-000 is a dual-channel speed and key phase transmitter. It monitors turbines, compressors, pumps, fans, and gearboxes. The module converts pulse signals from eddy current sensors into proportional analog speed output. It also provides a digital output for key phase detection. This transmitter suits both large industrial systems and standalone small machinery monitoring. Its robust design ensures reliable operation in harsh industrial environments.

Technical Specifications

• Model Number: A3311/022-000

• Function: Dual-channel speed and key phase transmitter

• Sensor Compatibility: Eddy current sensors (PR6422, PR6423, PR6424, PR6425, PR6426)

• Measurement Range: 0–65,535 RPM

• Speed Output: 0/4–20 mA analog signal proportional to RPM

• Key Phase Output: Digital pulse output for phase reference

• Power Supply: 18–31.2 V DC

• Current Consumption: ~100 mA @ 24 V DC

• Power Consumption: ~2.5 W

• Load Resistance: < 500 Ω

• Alarm Outputs: One “OK” status, two configurable limit alarms

• Alarm Settings: User-configurable 1–65,535 RPM; rising/falling edge trigger

• Setup Method: Toggle switches and rotary knobs; factory preset or user-defined

• Self-Test Function: Built-in diagnostics for sensor and transmitter faults

• Isolation: Galvanic isolation via internal DC/DC converter

• EMC Compliance: EN55011, EN50082-2

• Shock Resistance: 20g / 2 ms

• Vibration Resistance: 5g @ 60 Hz

• Protection Rating: IP65 housing; not explosion-proof

• Housing Material: Corrosion-resistant aluminum

• Dimensions (W×H×D): 127.5 × 125.75 × 80 mm

• Weight: 1.3 kg