Fluke 931 Contact and Non-Contact Tachometer

The Fluke 931 is a professional contact and non-contact tachometer designed for rotating machinery diagnostics in industrial plants and utility environments. Featuring precision dual-mode photoelectric sensing and mechanical contact wheels, it enables technicians to prevent rotational mechanical slippage and ensure verified shaft velocity readings. Backed by MME in the UAE, this unit comes with genuine manufacturer warranty and complete factory verification.

The Fluke 931 measures rotational shaft velocity and linear feed speeds across 5 certified operating parameters:

• Non-Contact Optical Speed: 1 to 99,999 RPM with up to 500 mm sensing distance.
• Mechanical Contact Speed: 1 to 19,999 RPM using hardened conical contact heads.
• Conveyor Linear Speed: 0.10 to 1,999 m/min using the calibrated 0.1 m perimeter wheel.
• Measurement System Accuracy: ±0.02% of reading ±1 digit across contact and optical modes.
• Dynamic Memory Logging: Instantaneous recall of Maximum (MAX), Minimum (MIN), and Average (AVG) values.

The Fluke 931 tachometer alternates between 2 operational testing methods to inspect motors, pumps, and conveyor lines:

1. Optical RPM Measurement: Projects a high-intensity optical beam onto self-adhesive reflective strips from 50 mm to 500 mm away, safeguarding technicians outside machine safety cages.
2. Mechanical Contact Measurement: Connects a mechanical adapter with either conical tips for motor shaft center-holes or a 0.1 m wheel for surface linear speed calculation.
3. Automatic Power Management: Conserves energy via programmed auto-shutoff intervals, delivering up to 40 hours of continuous field testing on 2 × 1.5V LR6 AA batteries.

The Fluke 931 delivers dual contact and optical testing with ±0.02% accuracy, whereas the Fluke 930 is restricted to optical-only measurement, and the Testo 470 offers dual modes at ±0.2% contact accuracy:

Engineering teams in water purification, chemical plants, HVAC, and power utilities deploy the Fluke 931 tachometer for 4 primary field diagnostic checks:

1. Electric Motor & VFD Speed Auditing: Verifying actual motor shaft output against inverter control frequencies to detect slip or overload conditions.
2. Industrial Conveyor Speed Balancing: Calculating linear belt throughput in meters per minute (m/min) across packaging and assembly facilities.
3. Pumping System & HVAC Blower Inspections: Reading impeller rotational velocity safely through mesh guards using high-contrast reflective tape.
4. Gearbox & Belt Ratio Validation: Quantifying speed ratios between driver and driven pulleys to detect mechanical belt slack or transmission loss.

The standard Fluke 931 kit includes the verified accessories required for both contact and optical testing:

• Fluke 931 Handheld Digital Tachometer Body
• 0.1 m Calibrated Surface Speed Measuring Wheel
• Conical Contact Adapter Head and Inner-Cone Adapter Head
• Lengthening Extension Rod for Deep Machinery Access
• 10 Self-Adhesive High-Contrast Reflective Marker Strips
• 2 × 1.5V LR6 AA Alkaline Batteries (Approx. 40 hours runtime)

Physical Form Factor: Compact 175 × 60 × 28 mm chassis weighing 250 g for single-handed industrial operation.

As a specialized supplier of precision test and measurement instruments in the UAE, Saudi Arabia, and Oman, MME supplies genuine Fluke instruments with certified calibration and factory warranty. Request an official quote or technical comparison against your plant machinery specifications today.