Gas Detection 17
ATEX approved modular gas detector offers acceptional fl exiblity Gas detection
instruments
constantly monitor for the presence of toxic and fl ammable gases along with the monitoring for low oxygen environments. These devices provide constant monitoring of the area in which they are installed. Should hazardous gases within the surrounding air exceed permitted levels, signals are sent to the control and monitoring panels and the warning and evacuation procedures are initiated. Each system however requires different parameters such as output types, communication protocols and display options. A need for a modular device with the capability of adding and removing such functions/features is now more demanding than ever in order to be able to cover most projects including the ones with limited budget.
The Silversafe 500 is the latest ATEX approved modulargas detector offered by Silver-Tec which enables tailored functionality to meet project requirements at an optimised cost. Spending money on extra features that is not needed by the project is what Silversafe 500 is designed to avoid.
For More Info, email: email:
For More Info, email: email:
46944pr@reply-direct.com CO2
datalogger goes on the road - with surprising results CO2
sensor specialists, Gas Sensing Solutions (GSS), took a CO2 datalogger
on a business trip from Scotland to Asia to see how the levels of CO2 changed on different modes of transport throughout the journey.
Surprised by how high levels were on occasions, GSS will be doing further investigations in other locations to see how CO2 The datalogger used measures CO2
concentration, air pressure and
temperature along with relative humidity every few minutes. It is a custom solution designed and built by GSS and uses one of its low power, ambient air, CozIR®
-A 5000 sensors. This low power consumption enabled the
datalogger to record over a 2-week period without needing a change of battery. The other sensors are an NXP MPL3115A2 pressure sensor and a Sensirion SHT21 temperature and humidity sensor.
The graph shows how the CO2
ventilation to remove CO2 guideline is that CO2
level in blue and the air pressure level in
green fl uctuated throughout the journey. It clearly shows increased levels of CO2
when there are a number of people in a confi ned space with limited build up. The World Health Organisation1
levels should be below 1000 ppm, and ASHRAE (the
American Society of Heating, Refrigeration and Air Conditioning Engineers) says that CO2
at high concentrations of 5000 ppm can pose a health risk2.
The drop in air pressure on the graph shows the part of the journey that was in a plane. The train journeys show particularly high levels of CO2
, where CO2 levels built up to over 2000 ppm. Similar results are shown
from the meeting room. However, perhaps surprisingly the highest CO2 peaks were during the taxi journeys with two passengers and a driver. This
consistently produced levels in excess of the 5000 ppm health risk indicator mark2 - and, at one point of the journey, even peaked at 10,000 ppm. This really shows the high levels of CO2
that people can be exposed to while driving through a busy city.
“Generally, people are still not aware of the problems of high CO2 concentrations,” said Dr David Moodie, Technical Manager at GSS. “That drowsy sensation you often experience in a stuffy meeting room is caused by elevated levels of CO2
the more apparent the effect is on the body. Travelling can often be tiring, leaving you feeling worn out. This real-world data shows how often you can be exposed to high levels of CO2
planes!” Most CO2
levels vary in the real world.
. The higher the level and the longer the exposure, without
realising it - even in taxis and trains - and this could be a signifi cant factor in how you feel. So, my advice is to open windows whenever possible to let the CO2
out. Naturally that does not apply on sensors work by measuring how much light is absorbed by CO2 molecules in the 4.2 to
4.4 microns range as it passes through the sample gas, which is called Non-Dispersive Infra Red (NDIR) absorption. The amount of absorption indicates how much CO2
is present. GSS developed
proprietary LEDs that are specifi cally tuned to emit at these wavelengths. The LEDs use very little power and turn on almost instantly, enabling sensor readings to be made in a few seconds. As a result, GSS has pioneered the development of CO2
sensors that can be powered by batteries for
long periods of up to ten years. Competitor sensors use IR sources that require signifi cantly more power per measurement and also take much longer to reach a stable condition for a measurement, resulting in the need for mains power.
When contacting companies directly from this issue of International Environmental Technology please tell them where you saw their product.
Thank you
www.envirotech-online.com IET November / December 2018
For More Info, email: email:
For More Info, email: email:
47250pr@reply-direct.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108
