Security Dealer & Integrator

JUL 2018

Find news and information for the executive corporate security director, CSO, facility manager and assets protection manager on issues of policy, products, incidents, risk management, threat assessments and preparedness.

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22 Security Dealer & Integrator / www.SecurityInfoWatch.com July 2018 to deal with, including weather and temperature resistance, corrosion and scratching problems, and, of course, the physical installation itself. Challenge: The Weather Surveillance cameras installed on the exterior of trains must be able to with- stand any type of weather through- out the year. When a train is mov- ing at high speeds and the weather is extreme, the challenge becomes even more convoluted. Integrators must ensure cameras will work reliably in these challenging conditions. Here are several factors to consider: 1 High temperatures: In some parts of the world, summer temperatures can regularly reach and exceed 100 degrees. Cameras on the exterior of a train can reach much higher temperatures because of the many heat-generating electrical com- ponents and cables contained within. A camera designed to withstand the weather will be contained within a tightly sealed metal housing, making it difficult for heat to dissipate – fur- ther increasing its temperature. For this application, integrators should choose cameras where each compo- nent has been tested to withstand high temperatures for prolonged periods of time. e lens, ICR, optical filter and image sensor should all be subjected to temperature tests over a period of at least 48 hours with high humidity. e testing should also include high and low temperature cycles to ensure that image quality is not impacted. In addition to the cameras, all cables must be UL-certified to with- stand the outside temperature as well as the additional heat generated within the camera housing. Choose compo- nents with a slightly wider temperature range than is expected to be encoun- tered, as this will protect against unex- pectedly high temperatures. Products and components that can withstand high temperatures receive appropriate thermal and reliability certifications – indicating the camera should last for at least five years with little risk of mal- function due to high temperatures. 2 Low temperatures: Obviously, trains can run during extremely cold condi- tions as well, and cameras in environ- ments where temperatures can dip into the double-digit negatives are sub- ject to challenges that can impact the mechanical operation of cameras as well as its usability for the customer. Further compound- ing the cold weather challenge is that trains moving at high speeds disperse heat away from the camera. While manufacturer specifications should address the mechanical function of the device in cold weather, the chal- lenge of keeping snow or frost from covering the front of the cam- era – making recording impossible – is a major headache for end-users and integrators. Some of these problems can be averted by choosing a weatherproof casing, Exterior cameras like the one positioned over the train operator's head, enable the safe monitoring of train platforms and passenger ingress/egress. For exterior train applications, integrators should choose cameras where each individual component has been tested to withstand high temperatures for prolonged periods of time. Video Surveillance Photo: Wikimedia Commons

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