Enerpac HMT Series, Operation And Maintenance Manual

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1.2  ATEX Safety Precautions

Reducing the Risk of Explosion

Failure to observe and comply with the following 

precautions and instructions could result in 

explosion and/or fire. Death and/or serious personal 

injury could occur.

•  To help reduce the risk of explosion, be certain 

to use the HMT-Series torque wrench only in the 

specific explosive atmospheres for which it has 

been tested and certified. Refer to the beginning 

of this section for ATEX classification information.

•  The HMT-Series torque wrench is generally not 

considered as a potential source of ignition. 

However, proper operation and maintenance of 

the tool is essential in order to help ensure that no 

sparks are generated that could cause an ignition 

of an explosive gas or dust mixture (which might be 

present in the environment). Complete operation 

and maintenance instructions must be provided to 

all personnel in advance of operating or servicing 

the wrench.

•  Hot surfaces can be a major source of ignition. 

To help prevent the possibility of ignition resulting 

from excessive surface temperatures, do not use 

the wrench in an environment with an ambient 

temperature of above 104°F [40°C].

•  Enerpac has designed and constructed the HMT-

Series torque wrench to minimize the possibility 

of an incendiary spark that may be caused by the 

impact of aluminium components with corroded 

steel. However, to reduce the chance of an 

incendiary spark, use of the wrench with corroded 

steel structures or components should be avoided 

whenever possible. Be especially careful to avoid 

accidental impacts with the wrench and corroded 

steel.

  WARNING

To help prevent a mechanical spark hazard, 

no components containing a magnesium content 

greater than 7.5 percent have been used in the HMT-

Series torque wrench (in accordance with standard EN 

13463-1).

•  Take extreme care to prevent the HMT-Series 

torque wrench from being dropped on the floor or 

onto any other metallic surface that might cause 

mechanical sparks at impact. Also, take every 

precaution to prevent other tools (or other metallic 

objects) from dropping onto the HMT-Series torque 

wrench.

Electrostatic Discharge

•  Electrostatic discharge is a potential source of 

ignition and can result in electrostatic build-up 

on isolated conductive parts. Isolated conductive 

parts create capacitive poles which can become 

charged. Electrostatic discharge risk is minimized 

by the hydraulic hoses, which have multiple layers 

of steel braiding, resulting in electrical continuity 

between the torque wrench and the grounded 

hydraulic pump.

•  Non-conductive polyester labels could be a site 

for electrostatic build-up. However, electrostatic 

build-up is prevented by the close proximity of the 

grounded torque wrench body.

NOTICE