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Gas Detection and Environmental Monitoring; Vibration and Machine Condition Monitoring and Control

Email Address
Newby Road,
Hazel Grove,
SK7 5DY,
United Kingdom
Fax Number

Trolex has specialised in the design and manufacture of sensors and systems for heavy industry and hazardous areas for over 40 years. We are at the forefront of safety monitoring for the mining and tunnelling industries and our ongoing development programme ensures we maintain our reputation for innovation and cost effective solutions.

Our aim is to provide our customers with the complete solution to their monitoring and control needs. Sensors for the detection and monitoring of gas, air flow, temperature, vibration and pressure, together with a complete range of controllers and SCADA, allow us to package bespoke systems engineered to the customers requirements.


We supply a range of fixed and portable toxic and flammable gas sensors using infra red, electrochemical and catalytic combustion techniques for the detection of methane, carbon monoxide, oxygen, carbon dioxide, nitrogen dioxide, nitric oxide, sulphur dioxide, hydrogen sulphide and higher hydrocarbons.

Specifically designed for use in underground installations they provide the end user with monitoring which offers high stability and reliability together with ease of maintenance. Replaceable pre-calibrated gas sensing heads can be changed in seconds eliminating the need for local gas calibration facilities.

The TX6373 / TX6383 toxic and flammable gas sensor / transmitter provide safety protection.
The TX5920 series programmable vortex flow sensor / transmitter provides microprocessor controlled flow measurement of gases.
TX5630 series vibration sensors are high accuracy sensors with AC frequency output signal for precision vibration measurement.
Programmable Sensor Controller TX9042 provides complete monitoring and control together with data acquisition for local area or machine monitoring.
Commander System TX2100 I/O command and control system for sensors, control devices and alarms.


Our airflow / ventilation monitoring sensors use an analogue flow sensor for velocity and volumetric measurement in ventilation ducts, roadways and tunnels. They feature a self-cleaning vortex sensing head and can operate as low as 0.5m/s. Available in various mounting formats and intrinsically safe options, the air flow / ventilation monitoring sensors have no moving parts, simple push-button scaling, a calibration function facility and choice of analogue output.


The vibration sensors for machine condition monitoring provide accurate monitoring of bearings on fans, motors, pumps and gearboxes with velocity or acceleration measurement. The vibration sensors have fully conditioned 4mA to 20mA analogue output signal or unconditioned mV/g output. They are solid, robust and compact and supplied with armoured cable and a simple M8 mounting stud. Intrinsically safe versions are available.


A versatile range of control and monitoring units completes Trolex’s sensor capability. We offer trip amplifiers, sensor controllers and bus expandable I/O systems as part of the total package.

Programmable Trip Amplifier TX9030 and TX9130 – total versatility in a single unit with direct fingertip programming of a wide selection of functions for output control and display.

  • Single analogue input module
  • Dual relay output
  • Large LCD display showing level and engineering units
  • Set-point time delays
  • Latch or auto-reset relay functions
  • Peak and low level reading memory

Programmable Sensor Controller TX9044 and TX9042 – complete monitoring and control together with data acquisition for local area or machine monitoring. Any combination of gas, flow or other sensor inputs can be configured. Data communications allow information to be transferred locally or over a wider network.

  • Up to eight analogue sensor inputs or 16 digital
  • Four assignable relay outputs with set point selection, time delays and hysteresis selection
  • Simultaneous display of all inputs
  • Signal bar graph display and engineering units
  • Data logging
  • RS232/RS485 datacomms
  • Signal fault alarm

Commander TX2100 – a bus expandable command and control system incorporating modular I/O interfaces for simple gathering of local large scale distributed networks linking to SCADA.

  • Bus expandable to 128 channels of I/O
  • Each terminal module accepts up to eight I/O cards
  • Sensor input values
  • Control output status
  • Data history
  • Channels can be configured without interruption of the system

As part of the ‘Total Package’, Trolex provides a wide selection of Ex power supplies and battery back up systems for use in mining and tunnelling.

Press Releases

  • New Era Launched For Trolex South Africa

    Trolex, one of the world's leading manufacturers of gas sensors and sensing systems, has recently re-affirmed its long-term commitment to the South African mining market by further improving service through a series of key appointments within the company. Trolex has demonstrated its

  • Trolex Adds In-Line Vortex Gas Flow Sensors to Range

    Trolex, one of the leading manufacturers of sensors and sensing systems, has just introduced an in-line version of its vortex gas flow sensor/transmitter. Designed for in-line flow monitoring of air, gases and vapours in pipelines, the TX5926 and TX5927 models are made to the usual

  • Trolex Appoints New Mining Sales Engineer

    Alan Scott has recently been appointed as mining sales engineer for leading manufacturer of sensors for hazardous areas and mining safety, Trolex. Having previous experience as an underground electrician, systems engineer and service engineer for major organisations within the mining

  • New Flexiprobe Deflection Switch Has No Limits

    Trolex has just launched a brand new version of its proven Flexiprobe multi-purpose limit switch which has extensive applications in the mining, coal and quarry industries. With its tough heavy-duty specification, the new Flexiprobe has been carefully value-engineered and at around &pou

  • Methane Monitoring Takes on a New Importance

    The advance of methane recovery monitoring equipment technology is helping mining companies to improve safety and generate new revenue. Phil McClean, senior engineer at gas sensing specialist Trolex, explains the opportunities ahead. Underground mines are the single largest source of co

Trolex Limited
Newby Road
Hazel Grove
United Kingdom

Email address