Pinpoint accuracy combined with measurement versatility

The SKF TMRT series includes two user-friendly and accurate tachometers utilising laser or contact for measuring rotational and linear speed: TMRT 1 and TMRT 1Ex. Equipped with laser and contact adaptor, both tachometers offer excellent speed measurement versatility in many different modes.

• Laser optical system:
  • Easy and quick non-contact measurement at safe distance from rotating machinery
  • Large angular range of ± 80° to target
    • Facilitating easy measuring in areas where straight-line access is difficult
  • Surface imperfections to be used as a target
• The user can select to measure:
  • rpm, rps, m, ft or yds per minute or second
  • distances
  • Count revolutions
  • Time interval
• Wide speed range and the diverse measurement modes make the TMRT series suitable for measuring speed in many applications
• The large inverting LCD display facilitates easy reading even when pointing the unit down into the machinery
• Compact design; easy to use, one-hand operated instrument
• Supplied in carrying case for protection and portability

Non-contact laser measurement

Contact measurement

Remote laser sensor measurement

Inverting LCD display

Intrinsically safe tachometer TMRT 1Ex
The SKF TMRT 1 is also available in an intrinsically safe (Ex) version, especially designed for use in potentially explosive hazardous areas. The TMRT 1Ex has been tested and certified according to the latest ATEX standards for use in intrinsic safety zones generally found in industries such as the petrochemical, gas and pharmaceutical among others.

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Download User's Manual

Technical data

• Designation: TMRT 1 / TMRT 1Ex
• Display: Inverting LCD Vertical 5 digit display
• Display functions: 180º Inverting
• Rotational speed range:
  • Optical mode: 3 - 99,999 rpm (or equivalent in rps)
  • Contact mode: Max. 50,000 rpm for 10 sec (or equivalent in rps)
• Linear speed range
  • 0.30 to 1500.0 Metres or Yds/min. (4,500 ft/min)
  • or equivalent in seconds
• Measurement modes
  • Optical; rpm and rps (also Count and Time)
  • Via contact adaptor; rpm and rps, metres, yards, feet, per min and per sec.
  • Count total (accumulator) revs, metres, feet, yards
  • Measure Time interval in seconds between pulses (reciprocal rate)
  • Speed Capture feature - Maximum, Minimum or Average rate
• Laser optical range 50 mm - 2000 mm (1.9 - 78.7 in)
• Angle of operation: ± 80º
• Light source: Class II laser diode
• Accuracy speed modes only: 0.01%, ± 1 digit
• Resolution range features: Fully Auto ranging up to 0.001 digit or ± 1 digit fixed, user selectable
• On target indicator Yes
• Low battery indicator Yes
• Memory features
  • Last reading held for 1 minute
  • Program settings retained in memory after power off
• Auto switch off After 1 minute
• Remote input for laser remote sensor TMRT 1-56: Yes, TMRT 1 only
• Contact adaptor
  • Included complete with rpm cone and
  • removable metric wheel assembly
• Battery type TMRT 1: 4 x AAA alkaline cells
• Battery type TMRT 1 Ex: Only use 4 x Duracell "Procell" AAA cells
• Unit dimensions: 213 x 40 x 39 mm (8.3 x 1.5 x 1.5 in)
• Unit weight: 170 g (5.9 oz)
• Carrying case dimensions: 238 x 49 x 102 mm (9.3 x 1.9 x 4.0 in)
• Total weight (incl. case): 355 g (12.5 oz)
• Warranty: 12 months
• Intrinsically safe classification TMRT 1Ex only
  • EEx ia IIC T4
  • ATEX code: II 2G