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Rheintacho UK launches contact tachometer with ATEX certification

13 January 2015

The HTM tachometer was originally designed as a contact instrument for accurate measurement of rotational and surface speed without the need for power. This flexibility has led to it being widely adopted for many applications. This included environments where battery powered products caused concerns, particularly in dusty factories and where hazardous substances form part of the manufacturing process. 

More recently it has become apparent that for customer confidence it is important to demonstrate that the HTM is safe for these applications, and so Rheintacho UK have carried out some modifications to achieve ATEX certification.

This ATEX HTM variant is distinguished from the standard by a yellow holster for easy identification, and retains the key features and benefits of the standard HTM. The large dial is calibrated to show readings for both rotational and linear speed, whilst the range selector allows easy switching between ratios according to the input speed. With an accuracy of +/-0.5% at full scale deflection, the full measurement range is 10-10,000rpm, or 1-1000m/min, and the range selector is used to ensure that the actual speed is scaled to suit the dial. The ATEX HTM is surrounded with a rubber holster to provide protection as well as grip, and is ergonomically designed for single handed use.

Operation is straightforward, and since batteries are not used, there are no pre-checks required. To make a measurement, the correct contact tool selected, and attached to the HTM. This is then placed on the item to be measured, and the red locking button pressed. When the locking button is released, the pointer deflection is captured and held for erase of reading. When pressed again it automatically resets to zero.

Tachometers are frequently used as a simple method of calibrating or monitoring the speed of process equipment, or the components within them. The direct nature of the contact method means that the dial face is visible, and this can sometimes help to identify problems such as wear and vibration as they are reflected in pointer ‘wobble’ or unstable readings.

RHEINTACHO UK Ltd, a subsidiary of the German company RHEINTACHO GmbH, is specialized in the production of non-electronic measurement and indication instruments, and acts as a marketing, sales and service centre for the UK, Ireland and the Commonwealth. The German holding company RHEINTACHO Messtechnik GmbH has a longstanding tradition and has been engaged for over 113 years in the field of rotational speed, a crucial control quantity for mechanical processes. In-house product development, production and assembly departments guarantee quick and innovative solutions to customers’ individual requirements. The production range incorporates a wide range of solutions of a high technical quality, principally in the field of rotational speed sensors, hand-held measuring devices, rotary encoders and switching devices.

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