DF9011 Transient Speed Instrument | EPRO High-Precision Sensor

EPRO DF9011 Precision Transient Speed Instrument – Product Description

Overview

The EPRO DF9011, part of Emerson AMS Machinery Health, is a high-precision transient speed instrument designed for monitoring and protecting turbines, compressors, pumps, motors, and other rotating machinery. Moreover, it provides continuous speed monitoring with overspeed and zero-speed alarms, ensuring safety in critical industrial applications such as power generation, petrochemical, steel, paper, aerospace, and nuclear industries. Its microprocessor-based design delivers accurate readings while remaining maintenance-free under harsh operational conditions.

Technical Specifications

Sensor Inputs: Magnetic pickup, magnetoresistive, or eddy-current sensors
Measurement Functions:
• Continuous speed monitoring
• Overspeed alarm
• Zero-speed alarm
• Configurable tooth number for flexible measurement
Alarm Outputs:
• Multi-level relay outputs (two-stage alarms)
• Zero-speed control relay
Accuracy: ±0.2% F.S. for 4–20 mA output
Output Signals: 4–20 mA current, relay contacts for alarms/trips
Data Handling: Real-time speed recording, highest speed memory, EEPROM retention
Diagnostics: Continuous self-diagnostics and “OK circuit” monitoring
Power Supply: 85–265 VAC, 15 W consumption
Sensor Power Supply: ±12 V to ±24 V DC, max 35 mA
Response Speed: Millisecond-level transient speed sampling
Mechanical Design: Standard panel-mounted metal housing, ABS front frame, flexible membrane keypad

FAQ

Q1: Which sensor types are compatible with the DF9011?
Supports magnetic pickup, magnetoresistive, and eddy-current sensors.

Q2: What is the measurement accuracy of the instrument?
The accuracy is ±0.2% of full scale for 4–20 mA output.

Q3: Can the device store data during a power outage?
Yes, EEPROM storage retains all parameters and speed data.

Q4: What alarms are supported?
Overspeed alarm, zero-speed alarm, and configurable tooth number detection.

Q5: What industries is the DF9011 suitable for?
Applicable to power generation, petrochemical, steel, paper, aerospace, and nuclear applications.