A. Product Overview

The Metrix Plus TM 4005 Photo Contact Tachometer RPM and Surface Speed Meter is a 2 in 1 digital tachometer developed for measuring both rotational and linear speed.

Unlike a basic RPM meter that works only by contact or only through optical sensing, the TM 4005 provides both measuring methods in a single handheld instrument. This makes it useful for maintenance engineers who may need to check the speed of different types of rotating machinery.

The instrument can measure:

Photo or Non Contact RPM: 2.5 to 99,999 RPM
Contact RPM: 2.5 to 19,999 RPM
Linear Speed: 0.05 to 1999.9 metres per minute
Linear Speed: 0.2 to 6560 feet per minute

The non contact photo measurement can operate from approximately 50 to 500 mm distance, allowing rotational speed to be checked without physically touching the rotating component.

The TM 4005 also features automatic range selection and dedicated attachments for different types of rotating shafts. Its portable construction makes it suitable for field maintenance, machine inspection, production lines and workshop applications. 

Key Features

• Photo and contact tachometer in one instrument

• Non contact RPM measurement

• Contact RPM measurement

• Surface and line speed measurement

• Measurement in RPM

• Measurement in metres per minute

• Measurement in feet per minute

• Photo sensing distance from approximately 50 to 500 mm

• Automatic range selection

• Attachments for different rotating shafts

• Sampling frequency of approximately 0.8 seconds

• Battery operated portable design

• Suitable for industrial maintenance and machine testing

B. Working Principle

The Metrix Plus TM 4005 Digital Tachometer works using two different measuring principles depending on whether photo mode or contact mode is selected.

Photo Non Contact RPM Measurement

In photo mode, a reflective target is placed on the rotating component such as a motor shaft, pulley, fan or roller.

The tachometer directs its optical sensing system toward the rotating target. Every time the reflective target passes the sensing point, the instrument detects a reflected pulse.

The tachometer counts these pulses over a specific period and converts the pulse frequency into revolutions per minute or RPM.

Because physical contact with the rotating part is not required, this method is particularly useful for:

• High speed motors

• Fans

• Pulleys

• Rotating shafts

• Machinery where physical contact is difficult

• Components where contact measurement may not be desirable

The TM 4005 supports photo measurement from approximately 50 to 500 mm away from the rotating target. 

Contact RPM Measurement

For contact RPM measurement, the appropriate contact attachment is placed directly against the rotating shaft.

The rotation of the shaft causes the contact attachment to rotate. The instrument senses this rotation and calculates the rotational speed in RPM.

Contact mode is particularly useful when the rotating shaft is accessible and direct measurement is practical.

Surface Speed and Line Speed Measurement

The contact attachment can also be used to measure the movement of surfaces such as:

• Conveyor belts

• Rollers

• Printing machines

• Textile machinery

• Production lines

• Moving sheets and materials

The measuring wheel rotates as the surface moves. The tachometer converts the wheel rotation into linear speed.

The TM 4005 can display linear speed in:

metres per minute

or

feet per minute

This allows the same instrument to work as both an RPM meter and surface speed meter. 

C. Why Is the Metrix Plus TM 4005 Used?

Rotational speed is an important operating parameter for motors and industrial machinery. Incorrect RPM can affect machine performance, production quality, energy consumption and mechanical reliability.

The Metrix Plus TM 4005 is used to quickly verify whether rotating equipment is running at the expected speed.

Motor RPM Testing

The tachometer can measure the actual RPM of electric motors and compare it against the expected operating speed.

This can help during:

• Installation

• Commissioning

• Motor servicing

• Preventive maintenance

• Troubleshooting

Fan and Blower Speed Measurement

Fan and blower RPM can influence airflow and overall system performance. The TM 4005 can be used for checking rotating speed during HVAC and ventilation maintenance.

Conveyor Speed Measurement

Using contact line speed measurement, technicians can check the actual running speed of conveyor belts and moving production lines.

Roller Speed Measurement

Rollers used in printing, packaging, textile, paper and manufacturing machinery can be checked for rotational speed or surface speed.

Preventive Maintenance

Unexpected changes in machine RPM may indicate operating problems. Regular RPM measurements can therefore become part of a preventive or predictive maintenance program.

Production Quality Control

Certain manufacturing processes require machines to operate within a specified speed range. Measuring RPM and line speed helps technicians verify that machinery is operating according to process requirements.

Machine Commissioning

After installation, repair or motor replacement, the tachometer can be used to confirm that the machine is operating at the required rotational speed.

D. Suitable Buyers

The Metrix Plus TM 4005 Photo Contact Tachometer is suitable for professionals and businesses that regularly work with rotating machinery.

Industrial Maintenance Engineers

Suitable for checking motors, pumps, fans, shafts, rollers and other rotating equipment during preventive maintenance.

Electrical Maintenance Teams

Electrical technicians can use the instrument to verify motor RPM after installation, repair or servicing.

Mechanical Engineers

Useful for troubleshooting and testing rotating equipment, transmission systems and mechanical machinery.

HVAC Technicians

Suitable for measuring the rotational speed of fans, blowers and ventilation equipment.

Manufacturing Plants

Production and maintenance departments can use it for monitoring machinery speed and production line performance.

Conveyor System Manufacturers

Suitable for checking conveyor roller speed and belt line speed.

Motor Repair Workshops

Motor rewinding and servicing businesses can use the tachometer to verify actual motor RPM after repair.

Machine Manufacturers and OEMs

Original equipment manufacturers can use the TM 4005 during assembly, testing, commissioning and final machine inspection.

Printing and Packaging Industries

Useful for measuring rollers, shafts, printing machinery and material movement speed.

Textile Industry

Can be used for checking rotating rollers, shafts and moving production equipment.

Automotive Workshops

Suitable for general rotational speed testing and machinery maintenance applications where RPM measurement is required.

Technical Specifications

Frequently Asked Questions

1. What is the Metrix Plus TM 4005?

The Metrix Plus TM 4005 is a portable digital photo and contact tachometer used for measuring rotational speed, RPM, line speed and surface speed of motors, shafts, rollers, conveyors and other rotating machinery.

2. Can the TM 4005 measure RPM without touching the rotating shaft?

Yes. The TM 4005 provides photo non contact RPM measurement. A reflective target is used on the rotating component and the tachometer detects the reflected pulses to calculate RPM.

3. What is the maximum RPM range of the TM 4005?

In photo non contact mode, the TM 4005 can measure up to 99,999 RPM. In contact mode, it can measure up to 19,999 RPM.

4. Can the Metrix Plus TM 4005 measure conveyor speed?

Yes. Using the contact attachment, the TM 4005 can measure linear or surface speed, making it suitable for conveyor belts, rollers and production lines.

5. Does the TM 4005 measure surface speed?

Yes. The tachometer can measure surface or line speed in metres per minute and feet per minute.

6. What is the difference between photo and contact tachometer measurement?

Photo measurement checks RPM without physically touching the rotating component. Contact measurement requires the tachometer attachment to physically contact the rotating shaft or moving surface.

7. Which measurement method should I use for high speed rotating equipment?

Photo non contact measurement is generally more suitable when the component is rotating at high speed or when physically contacting the rotating component is difficult.

8. Can this tachometer be used for electric motors?

Yes. It can be used to measure the RPM of electric motors during installation, testing, maintenance and troubleshooting.

9. Can the TM 4005 be used for fans and blowers?

Yes. The non contact RPM function makes it suitable for checking the rotational speed of fans, blowers and other rotating equipment.

10. Can it measure roller speed?

Yes. Depending on the application, roller rotational speed can be measured in RPM and moving surface speed can be measured using contact line speed measurement.

11. What is the non contact measuring distance?

The specified photo measurement distance is approximately 50 to 500 mm from the target.

12. What industries can use the TM 4005 tachometer?

It is suitable for manufacturing, automotive maintenance, HVAC, electrical maintenance, mechanical maintenance, textile, printing, packaging, conveyor systems, machine building and industrial production facilities.

13. Is the TM 4005 suitable for preventive maintenance?

Yes. RPM monitoring can help maintenance teams verify machine operating speed and identify unusual changes in equipment performance.