Metrix+ DT 2235BL Contact Tachometer RPM and Surface Speed Meter

A. Product Overview

The Metrix Plus DT 2235BL Contact Tachometer RPM and Surface Speed Meter is designed for direct contact measurement of rotating equipment and moving surfaces.

Unlike a non-contact laser tachometer, the DT 2235BL uses a physical attachment that makes contact with the rotating shaft, wheel, belt or roller being measured. This makes it suitable for applications where direct mechanical speed measurement is required.

The instrument supports two primary measurement modes:

Contact RPM Measurement:
Measures rotational speed from 1 to 19,999 RPM.

Contact Line Speed Measurement:
Measures moving surface speed from 1.00 to 1999.9 m/min or 3.3 to 6560 ft/min.

The meter provides an accuracy of ±0.05 percent plus 5 digits and automatically selects the appropriate measuring range.

Its Max, Min and Data Hold functions make it easier for technicians to record speed variations during equipment inspection and maintenance.

Key Features

• Contact RPM measurement from 1 to 19,999 RPM
• Surface and line speed measurement
• Measurement in m/min and ft/min
• Automatic range selection
• Max value function
• Min value function
• Data Hold function
• Large backlit digital display
• Rugged attachments for different rotating shafts
• Portable handheld design
• Suitable for motors, shafts, belts and rollers
• Useful for maintenance and machinery diagnostics
• Five attachments supplied as standard

B. Working Principle

The Metrix Plus DT 2235BL works on the contact tachometer measurement principle.

For RPM measurement, an appropriate contact attachment is placed directly against the rotating shaft or rotating component. As the shaft rotates, the contact attachment rotates with it.

The instrument detects this mechanical rotation and calculates the rotational speed, displaying the result in revolutions per minute or RPM.

For surface speed measurement, the contact attachment is placed against the moving surface, such as a belt or roller. The movement of the surface rotates the attachment, allowing the meter to calculate the corresponding linear speed.

The measurement can then be displayed in:

• Metres per minute
• Feet per minute

Because the DT 2235BL uses direct physical contact, it is particularly useful where a technician can safely access the rotating component and wants to measure actual rotational or surface speed directly.

C. Why Is the Metrix Plus DT 2235BL Used?

Rotational speed is an important operating parameter in many industrial machines. Incorrect RPM can indicate mechanical problems, incorrect motor operation or production process issues.

The Metrix Plus DT 2235BL helps technicians verify whether motors, shafts, rollers and conveyors are operating at the required speed.

It can be used to:

• Measure motor RPM
• Measure rotating shaft speed
• Check roller speed
• Measure conveyor and belt surface speed
• Verify machinery operating speed
• Compare actual RPM with specified RPM
• Check speed during machine commissioning
• Support preventive and predictive maintenance
• Diagnose abnormal machinery operation
• Perform production line speed checks
• Carry out quality control measurements
• Check HVAC motor and fan speed

Regular speed measurement can help maintenance teams identify abnormal operating conditions before they result in major machine problems.

It is also useful for production departments where consistent shaft, belt or roller speed is important for maintaining process quality.

D. Suitable Buyers

The Metrix Plus DT 2235BL Contact Tachometer is suitable for industrial users who need to measure RPM or surface speed directly.

Industrial Maintenance Teams

Maintenance engineers and technicians can use the tachometer for checking motors, shafts, rotating equipment and machinery during routine maintenance.

Manufacturing Industries

Manufacturing plants can use the DT 2235BL for machinery speed monitoring, production line inspection and quality control.

Motor Maintenance and Repair Workshops

Motor repair technicians can use the instrument to verify motor RPM after servicing, testing or repair.

Machinery Manufacturers

Machine builders and OEMs can use the contact tachometer during machine assembly, commissioning and final testing.

Conveyor System Maintenance

The surface speed mode can be useful for measuring moving belts, conveyors and rollers.

Automotive Workshops

Automotive and mechanical workshops can use contact RPM measurement where direct rotational speed testing is required.

HVAC Maintenance Professionals

HVAC technicians can use tachometers to measure the rotational speed of accessible motors, fans and rotating equipment.

Quality Control Departments

Quality inspection teams can verify rotational and surface speed as part of machine and production process testing.

Educational and Technical Institutes

Engineering laboratories and technical institutes can use contact tachometers for practical demonstrations involving motors, rotational speed and mechanical systems.

Technical Specifications

Brand: Metrix Plus
Model: DT 2235BL
Product Type: Contact Digital Tachometer
Contact RPM Range: 1 to 19,999 RPM
Line Speed Range: 1.00 to 1999.9 m/min
Line Speed Range in Feet: 3.3 to 6560 ft/min
Accuracy: ±0.05 percent plus 5 digits
RPM Resolution: 0.1 RPM from 1 to 999.99 RPM and 1 RPM from 1000 RPM onwards
Line Speed Resolution: 0.01 m/min at lower ranges and 0.1 m/min from 100 m/min onwards
Functions: Max, Min and Data Hold
Range Selection: Automatic
Operating Temperature: 0 to 50 degrees Celsius
Operating Humidity: Below 80 percent RH
Power Supply: One 9 V 6F22 battery
Dimensions: 176 x 57 x 33 mm
Weight: Approximately 160 g
Standard Accessories: Main unit, five attachments, battery, manual, gift box packing and cloth bag

Frequently Asked Questions

1. What is the Metrix Plus DT 2235BL?

The Metrix Plus DT 2235BL is a digital contact tachometer used for measuring rotational speed in RPM and contact surface speed in metres per minute or feet per minute.

2. What is the RPM range of the DT 2235BL?

The DT 2235BL can measure contact rotational speed from 1 to 19,999 RPM.

3. Can the DT 2235BL measure surface speed?

Yes. It can measure contact line or surface speed from 1.00 to 1999.9 m/min or 3.3 to 6560 ft/min.

4. Is the DT 2235BL a contact or non-contact tachometer?

The DT 2235BL is a contact tachometer. An attachment physically touches the rotating shaft or moving surface during measurement.

5. Can it measure motor RPM?

Yes. The Metrix Plus DT 2235BL can be used for measuring the RPM of accessible motor shafts and other rotating components.

6. Can the DT 2235BL measure shaft RPM?

Yes. Shaft RPM measurement is one of its primary applications. The meter includes attachments designed for contact measurement on rotating shafts.

7. Can it measure conveyor belt speed?

The DT 2235BL supports contact line speed measurement, making it suitable for measuring moving surfaces such as belts and rollers when safe physical access is available.

8. What units are available for surface speed measurement?

Surface speed can be measured in metres per minute or feet per minute.

9. What is the accuracy of the Metrix Plus DT 2235BL?

The specified accuracy is ±0.05 percent plus 5 digits.

10. Does the DT 2235BL have automatic range selection?

Yes. The instrument provides automatic range selection for convenient measurement.

11. Does it have Data Hold?

Yes. The DT 2235BL includes a Data Hold function to retain a measurement reading on the display.

12. Does it show maximum and minimum readings?

Yes. The meter includes both Max and Min functions for monitoring measured speed values.

13. Is the display backlit?

Yes. The DT 2235BL has a large backlit digital display for easier reading.

14. What accessories are supplied with the tachometer?

The standard package includes the main unit, five attachments, battery, instruction manual, gift box packing and cloth bag.

15. What battery does the DT 2235BL use?

The instrument operates using one 9 V 6F22 battery.