none

Thermal flow switch helps keep tunnels safely ventilated

20-05-2021
by 
in 
thermal flow switch
The FLT93S from Fluid Components International.

Powerful fans are used to ventilate rail and road tunnels, but which direction should they be blowing in and how strong should the airflow be? That’s where a thermal flow switch such as the FLT93S from Fluid Components International (FCI) comes into the picture.

Supplied by AMS Instrumentation & Calibration, it helps manufacturers of powerful industrial fans and blowers used in the transportation industry to obtain accurate airflow control data under variable vehicle traffic conditions.

Proper tunnel ventilation is critical to maintain tunnel temperatures within acceptable limits and to help control the flow of fresh air to prevent unhealthy toxic carbon monoxide (CO) exposure, as well as smoke or gas in the case of fire or other emergencies.

Depending upon a tunnel ventilation system’s design, the airflow fans must operate in either a forward or reverse airflow configuration.  For example, during emergencies requiring air, gas or smoke evacuation, a flow switch such as the FCI Model FLT93S needs to detect forward or reverse fan airflow to prove air is blown into or extracted from a tunnel where vehicle drivers and emergency responders can be either trapped or at work.

The versatile FLT93S Thermal Flow Switch can be configured with a uni-directional shroud to help verify the airflow direction of each tunnel fan. FCI developed this special shroud for the FLT93S Switch, which allows the detection of airflow from a single direction. By installing two flow switches per fan, engineers and operating technicians are able to verify with confidence the direction of airflow for each fan in a tunnel.

The FLT93S Thermal Flow Switch is suitable for placement in tunnel ducts or fan casings up to 2.4 metres in diameter. It can detect airflow ranges from 0.08 to 37 NMPS with flow accuracy as precise as ±2% of the setpoint velocity over a ±28°C temperature range; repeatability is ±0.5% reading.  Flow elements are available for operation and survival (in the case of adverse conditions) for process temperatures up to either 260°C or 454°C.

Based on FCI’s thermal dispersion expertise, the unique sensor technology of the FLT93S Switches, combined with FlexSwitch temperature-compensation circuitry, introduces unparalleled performance capabilities for a wide range of heavy-duty industrial applications.

Featuring an all-welded, no-moving parts design, the FLT93S Switches require virtually no maintenance. There is nothing to break, clog or foul that requires continuous maintenance technician attention.  They are available with a choice of materials: 316 L stainless steel, Hastelloy or exotic materials. In addition, these switches offer an exceptionally long life and a low lifecycle cost.

AMS Instrumentation & Calibration - www.ams-ic.com.au

 

Related news & editorials

  1. 27.07.2021
    27.07.2021
    by      In
    The cost-effective new concertina doors from ATDC are manufactured to be lightweight from extruded aluminium sections and suspended from heavy duty aluminium top track. They have interlocking hinges and industrial grade heavy duty top wheel assemblies allowing the curtain to slide and retract... Read More
  2. 27.07.2021
    27.07.2021
    by      In
    Gates Australia as part of the Gates Corporation, a leading global provider of application-specific fluid power and power transmission solutions, introduces MegaSys MXT with XtraTuff Plus cover (MXT-XTP), a universally applicable hydraulic hose, featuring Gates' patent-pending wire-braid technology... Read More
  3. 27.07.2021
    27.07.2021
    by      In
    Single-Pair Ethernet (SPE) is a key technology in the advancement of the Smart Factory and Industry 4.0. It enables more consistent more efficient industrial Ethernet networks and only needs one pair of cores to transmit data.
    Previously, 2‑ and 4‑pair Ethernet cables have been the standard. By... Read More
  4. 22.07.2021
    22.07.2021
    by      In
    Control Logic is now offering the PULS PISA-B Electronic protection module. The new generation module is highly compact, with eight separated and individually adjustable channels. It delivers protection you can bank on for load circuits with different demands in 24V systems.
    A range of control... Read More
Products
Suppliers