Hilti DX 9-ENP Manual page 13

The fasteners may not be driven into materials other than structural steel and, in particular, not into hardened
steel, brittle steel, cast iron and spring steel.
3.4 Safety devices
The fastening tool features a 5-way safety system for the safety of the operator and any bystanders.
Piston principle
The energy from the propellant charge is transferred to a piston, the accelerated mass of which drives the
nail into the base material.
Through use of the piston principle, the tool is classed as a "Low Velocity Tool". Approximately 95% of
kinetic energy is taken up by the piston when the tool is fired. As the piston is always stopped by the tool
as it reaches the end of its travel, excess energy is absorbed by the tool. Accordingly, when the tool is used
correctly, dangerous through‐shots (i.e. with a nail muzzle velocity of over 100 m/s) are virtually impossible.
Drop-firing safety device
The drop-firing safety device is the result of coupling the firing mechanism with the cocking movement.
Trigger safety device
The trigger safety device prevents the tool firing when only the trigger is pulled. The tool must be pressed
against a firm surface before a fastener can be driven.
Contact pressure safety device
The contact pressure safety device requires application by the operator of a contact pressure of at least 250 N,
so a nail can be driven only when the tool is pressed fully against a firm surface with this or a higher force.
Unintentional firing safety device
The tool is equipped with an unintentional firing safety device. It prevents the tool from firing if the triggers
are first pulled and the tool then pressed against the work surface. The tool can be fired only when it is first
pressed fully against a firm surface and the triggers subsequently pulled.
3.5 Minimum distances and edge distances
You must always observe certain minimum distances and spacing when driving fasteners. They can differ,
depending on the product.
Comply with the instructions for use in the operating instructions of the fastener used, in the Hilti
Direct Fastening Technology Manual or the corresponding local Hilti 'Technical Guide to Fastening
Technology'.
3.6 Service indicator
The service indicator display incorporated in the grip consists of the display plus the Bluetooth and reset
buttons.
The display indicates the temperature of the fastening tool with a view to allowing the operator to avoid
overheating problems by adjusting the speed of use of the tool.
The service indicator display counts the number of fasteners driven and when the preconfigured limit is
reached it indicates that cleaning or maintenance of the tool is due.
Using Bluetooth, the data shown in the service indicator display, including the number of fasteners driven
and other information (e.g. the serial number of the tool, the number of fasteners driven since the last tool
service, etc.), can be read by the Hilti Connect smartphone app.
After cleaning, the number of fasteners driven before cleaning is again due can be reset by pressing the
reset button.
The service indicator and the built-in counter for the number of nails that can be driven before the next
service is due are reset by Hilti Service when the tool is serviced.
The smartphone app can be used to activate demo mode in which the various messages indicated by the
service interface over a period of 48 fasteners driven, up to and including the need for maintenance, are
presented.
The smartphone app can also be used to deactivate demo mode. Demo mode is automatically deactivated
after a period of 15 minutes.
Demo mode does not indicate the actual status of the tool.
The number of fasteners driven is also recorded while in demo mode, so the total counted is always
the actual value.
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