Honeywell XNX Universal Transmitter

XNX is an extremely flexible transmitter that can be configured to accept an input

from any of the Honeywell Analytics range of gas sensor technologies. It can also

be configured to provide a wide variety of industry standard output signals.

This enables users to have a single type of interface to all their gas detection needs,

even when different types of detectors are employed, to most effectively address the

different gas detection applications on site.

The most effective gas detection systems often employ a variety of detection technologies

including point flammable detectors (both catalytic and infrared type), toxic and Oxygen

electrochemical cell type detectors and open path infrared detectors. XNX provides a

common transmitter interface to all of these and can be configured to provide industry

standard signal outputs to match the individual requirement of each application or the

preferred site standard. If site output standards change, XNX can be reconfigured to

provide the newrequired output. XNX has also been future proofed by having the ability

to have other output modules fitted as new output standards are developed and adopted

by industry. Having a common transmitter platform for all your gas detectors brings further

benefits.

Common tools and installation methods simplifies and reduces cost of installation.

The common user interface makes operation faster to learn and easier to navigate, thus

reducing time needed for training as well as reducing the chance of incorrectly interpreting

messages or incorrectly changing settings.

Common spare parts also mean reduced maintenance spares stock levels and cost for

all detectors.

XNX allows you to apply the most appropriate gas detection technologies for each application,

standardise the interface to those detectors and has the flexibility to provide the required signal

outputs. With XNX the answer is always yes.

XNX Transmitter

XNX has Worldwide hazardous area and performance approvals and is housed in

a flameproof enclosure that is available in either painted marine grade aluminum alloy

or stainless steel 316 versions. A large backlit multilingual LCD clearly indicates the unit’s

status using a combination of text, digits and icons. Users can modify its operation using

the LCD and magnet switches without ever needing to open the unit. An optional local

IS HART® terminal port is also available.

Both enable one man, non-intrusive, operation and reduce routine maintenance time and

costs. Local LEDs are also provided to indicate the unit’s status at a glance.

XNX Transmitter Sensor Compatibility

XNX is compatible with all of the Honeywell Analytics range of industrial fixed

gas sensors including Searchline Excel, Searchpoint Optima Plus, Sensepoint (HT and

PPM) and Model 705. For further information on these sensors, please refer to their individual

datasheets.

The Multi Purpose Detector (MPD) is a serviceable stainless steel sensor housing with

plug-in catalytic and infrared sensor cartridges. The catalytic sensors measure flammable

gases in the range 0-100%LEL and the infrared sensors measure Hydrocarbons in the

range 0-100%LEL, or Methane 0-100%LEL (or 0-5%Vol) and CO20-5%Vol. See the

specifications section for full details of the MPD sensor.

The XNX EC sensor is also a serviceable stainless steel sensor with a wide range of toxic

and Oxygen plug-in sensor cartridges. The XNX EC sensor interface to the XNX transmitter is

intrinsically safe, allowing the sensors to be ‘hot swapped’ without the need for a hot work

permit. This reduces the cost of ownership by reducing the cost and time to service

the detector.

XNX Transmitter Configuration

XNX has three basic personalities (configurations) which support different types of sensor. 

The personality boards and optional output interfaces are enclosed in the electronics POD

(Personality, Options and Display). The POD determines the XNX transmitter behaviour

based on the sensor type attached to it and the selected output options.

The mV (millivolt) personality is used for all mV signal input sensors including MPD,

Sensepoint HT, PPM and the Model 705.

The EC (Electrochemical cell) personality is for use with the XNX EC toxic and Oxygen

sensors. The IR (infrared) personality is for use with the Searchline Excel open path and

Searchpoint Optima Plus point infrared gas detectors.

The table below shows the three basic XNX transmitter configurations and the sensors

each supports.