Application Example – Redundant Uninterruptible Power Supply System

We often see the MEAN WELL DR-UPS40 UPS module and MEAN WELL DR-RDN20 redundancy modules used in in road traffic applications.

Take tunnel ventilation and fume extraction systems for example.

The power supply for such equipment has to be both uninterruptible and redundant. The ventilation and fume extraction system has to be ready to activate as soon as the levels of potentially harmful gasses reach a level, which is deemed to be too high and could potentially cause a health hazard.

This could happen at any time of the day, not just during peak hours. It only takes an accident, or roadworks to cause traffic to back up in the tunnel. So, it is vital that the power supply for the system is always available.

The MEAN WELL DR-UPS40 UPS module is essentially a DIN rail mountable battery controller that is used in conjunction with any Mean Well DIN rail power supply (up to 40 amps) to provide UPS functionality to your power system.


It can be used with SLA & GEL batteries to back up to 40A on critical loads for a certain period of time, depending on the capacity of the batteries.

The MEAN WELL DR-RDN20 redundancy module is a 20A device that can be used on 24VDC power systems.


It ensures the safe operation of a 1+1 redundant installation and will perfectly decouple power sources from each other, as well as the load.

Click on the below link to learn more about how these two modules work:

MEAN WELL UPS & Redundancy Modules

Complete Gas Detection Solution

ADM doesn’t just sell power supplies.

In fact from our range of Senko Gas detectors and Eurotherm process controllers mean that we can supply a complete gas monitoring solution.

At the 2017 Australasian Oil & Gas Conference in Perth, ADM Instrument Engineering demonstrated a Carbon Monoxide Monitoring System.

The solution demonstrated comprised of a Senko SI-100 carbon monoxide analyser, which was connected to a Eurotherm Nanodac recorder / controller. In a real life situation, it is most likely that 4-5 sensors would be deployed around the area that is being monitored.

Senko SI-100 Gas Detector


The Senko SI-100 has been specifically designed for measuring toxic levels of CO (carbon monoxide), which is generated by a combustion process.

The SI-100 is a cost effective carbon monoxide analyser, which is rugged and available with IECEx approvals, so it can be used in hazardous areas where there is a risk of explosion. It is easily programmed using a magnet, which is provided.

The Senko SI-100 has a 4-20mA electrical output, which is compatible with a wide range of PLCs and controllers, such as the Eurotherm Nanodac.

Eurotherm Nanodac

Eurotherm Nanodac

The Eurotherm Nanodac is a recorder/controller that also acts as an alarm manger.

The crystal clear colour 3.5” TFT display gives a visual display of the gas reading. The Eurotherm Nanodac can also be programmed to change the screen colour according to the value of the readings from the Senko gas analysers. For example, if the gas reading reaches a level that is considered to be potentially harmful, the display can turn red. When the levels fall back to safe levels, the display is green.

The Nanodac will also record the data and has a secure data file function, so it can be used to record events as required by any health and safety regulatory bodies.

Scalable and Affordable

For increased functionality, the Eurotherm Nanodac can be used with other Eurotherm and non Eurotherm devices, such as a 3rd party external relay module. All that is required is a simple Ethernet connection and a few minutes setting up, the result of which is an increased relay output capability.

By using simple add on relay outputs, the number of alarm outputs on the Nanodac can be expanded by an additional 8 relays.

The result of incorporating Eurotherm into the Carbon Monoxide monitoring system is a highly flexible and control / alarm / data logging solution. More importantly, it is remarkably affordable.

For further information on MEAN WELL, Senko and Eurotherm products, call ADM Instrument Engineering on 1300 236 467. A member of our expert team will gladly answer any questions that you may have.

Use the ‘CONTACT’ link above if you would prefer to send us an E-mail.

Eurotherm Austraia
Senko Gas Detectors
29 June 2018