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The BULLET – Ex d Loop-Powered WirelessHART Adapter for Process Automation


An extremely rugged aluminum housing contains all electronic components of the loop-powered WirelessHART adapter, including the antenna.

Pepperl+Fuchs extends its WirelessHART portfolio with the "BULLET”. This loop-powered WirelessHART adapter enables new and existing wired 4 mA … 20 mA and HART field devices to communicate measurement, diagnostic, and parameterization data wirelessly. It is the only WirelessHART adapter on the market with an explosion proof Ex d housing and is suitable for use in explosion hazardous areas up to Zone 1/21, Class I, Div. 1  (also available as an intrinscally safe version for use in Zone 0 and a general purpose version).


Rugged housing for challenging industrial environments

An extremely rugged aluminum housing contains all electronic components, including the antenna – the unit is built to withstand harsh environmental conditions in process plants. The BULLET is permanently installed by attaching it directly or via conduit fitting to an Ex d field device or by being mounted on a junction box. Additionally, the Ex i version of the BULLET is also suitable for use with intrinsically safe field devices.


StepVolt technology optimizes available loop power

When using the BULLET, no additional battery is needed. Connection of HART devices is possible as well as connection of 4 mA … 20 mA devices, enabling flexible adaptation to changing application requirements.

The BULLET supplies itself with energy from the 4 mA … 20 mA current loop, using a special technology called “StepVolt”. This technology allows users to set insertion voltage from 1 V to 2.5 V in order to optimize the usage of available loop power and wireless communication bandwidth.

The BULLET provides reliable performance even under worst case low-current conditions, where there is very little power available – when using transmitters on very long cable runs or with intrinsically safe barriers. In scenarios where more power is available, the BULLET provides a higher amount of WirelessHART packets per second, leading to an increased performance of the overall WirelessHART network.


Multidrop of up to eight devices with one WirelessHART adapter

The BULLET is equipped with a powerful multidrop feature that significantly lowers the cost of adding devices to an existing WirelessHART network. With a single BULLET, up to eight field devices can be multidropped. This is especially useful for monitoring tank farms and pipelines.


Highlights at a glance

  • Only Ex d certified loop-powered WirelessHART adapter on the market, suitable for use in explosion-hazardous areas up to Zone 1/21, Class I, Div. 1
  • Rugged Ex d aluminum housing with fully encased antenna for harsh environments
  • Handles both 4 mA … 20 mA  and HART field devices, giving flexibility in applications
  • StepVolt technology makes very low voltage drop possible
  • Multidrop of up to eight field devices with a single BULLET saves network extension costs

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