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Burglar alarms
Looking for some advice on the most appropriate sensors for a moored
cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
Burglar alarms
IR sensors will detect the heat generated by someone in your boat. It's
ultrasound sensors that would be trigered by the motion of something moving in your boat. But what if the boat's interior is heated to higher than the body's temperature on a sunny day? I dunno enough about this to risk a categoric answer. But I GUESS it would generate a false alarm. Jean Dufour Montreal, Qc John Smith wrote: Looking for some advice on the most appropriate sensors for a moored cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
Burglar alarms
IR sensors will detect the heat generated by someone in your boat. It's
ultrasound sensors that would be trigered by the motion of something moving in your boat. But what if the boat's interior is heated to higher than the body's temperature on a sunny day? I dunno enough about this to risk a categoric answer. But I GUESS it would generate a false alarm. Jean Dufour Montreal, Qc John Smith wrote: Looking for some advice on the most appropriate sensors for a moored cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
Burglar alarms
I think IR sensors set off an alarm when the "picture" of IR changes. I have
done some testing with home security alarams, and if you really move slowly, the alarm will not go off. Haakon "Jean Dufour" wrote in message ... IR sensors will detect the heat generated by someone in your boat. It's ultrasound sensors that would be trigered by the motion of something moving in your boat. But what if the boat's interior is heated to higher than the body's temperature on a sunny day? I dunno enough about this to risk a categoric answer. But I GUESS it would generate a false alarm. Jean Dufour Montreal, Qc John Smith wrote: Looking for some advice on the most appropriate sensors for a moored cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
Burglar alarms
I think IR sensors set off an alarm when the "picture" of IR changes. I have
done some testing with home security alarams, and if you really move slowly, the alarm will not go off. Haakon "Jean Dufour" wrote in message ... IR sensors will detect the heat generated by someone in your boat. It's ultrasound sensors that would be trigered by the motion of something moving in your boat. But what if the boat's interior is heated to higher than the body's temperature on a sunny day? I dunno enough about this to risk a categoric answer. But I GUESS it would generate a false alarm. Jean Dufour Montreal, Qc John Smith wrote: Looking for some advice on the most appropriate sensors for a moored cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
Burglar alarms
"Jean Dufour" wrote in message
... IR sensors will detect the heat generated by someone in your boat. It's ultrasound sensors that would be trigered by the motion of something moving in your boat. But what if the boat's interior is heated to higher than the body's temperature on a sunny day? I dunno enough about this to risk a categoric answer. But I GUESS it would generate a false alarm. They don't. IR sensors 'look' into the area in sectors, like A-B-A-B-A-B and reacts on the difference between A and B. If the environment temperature changes, both the A and B sectors change, hence no alarm. If someone walks through the area, A changes, then B, then A again. The alarm trigger is set to the amount of change and the number of changes. It can be set so accurately that it wouldn't alarm on a cat or a small dog, but only on a large enough body, like a human. Because is reacts on changes, it also does not alarm on a sudden sunshine through a porthole. Meindert |
Burglar alarms
"Jean Dufour" wrote in message
... IR sensors will detect the heat generated by someone in your boat. It's ultrasound sensors that would be trigered by the motion of something moving in your boat. But what if the boat's interior is heated to higher than the body's temperature on a sunny day? I dunno enough about this to risk a categoric answer. But I GUESS it would generate a false alarm. They don't. IR sensors 'look' into the area in sectors, like A-B-A-B-A-B and reacts on the difference between A and B. If the environment temperature changes, both the A and B sectors change, hence no alarm. If someone walks through the area, A changes, then B, then A again. The alarm trigger is set to the amount of change and the number of changes. It can be set so accurately that it wouldn't alarm on a cat or a small dog, but only on a large enough body, like a human. Because is reacts on changes, it also does not alarm on a sudden sunshine through a porthole. Meindert |
12V IR Detectors?
Anyone found a source for 12 volt IR detectors?
"John Smith" wrote in message ... Looking for some advice on the most appropriate sensors for a moored cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
12V IR Detectors?
Anyone found a source for 12 volt IR detectors?
"John Smith" wrote in message ... Looking for some advice on the most appropriate sensors for a moored cruiser. I have switches on the door, the hatch and some windows, I have two infra red motion detectors and a pressure mat. Are the IR detectors any good on a boat that sways a lot in the wind etc? Any other options? Thanks in advance |
12V IR Detectors?
On Thu, 11 Dec 2003 19:29:21 GMT, "padeen"
wrote: Anyone found a source for 12 volt IR detectors? I hope You are joking, as they are all 12V for normal alarm use. /Marcus -- Marcus AAkesson Gothenburg Callsigns: SM6XFN & SB4779 Sweden Keep the world clean - no HTML in news or mail ! |
12V IR Detectors?
On Thu, 11 Dec 2003 19:29:21 GMT, "padeen"
wrote: Anyone found a source for 12 volt IR detectors? I hope You are joking, as they are all 12V for normal alarm use. /Marcus -- Marcus AAkesson Gothenburg Callsigns: SM6XFN & SB4779 Sweden Keep the world clean - no HTML in news or mail ! |
12V IR Detectors?
Marcus, are you capable of understanding that your post reveals our combined
ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? Padeen "Marcus AAkesson" wrote in message ... On Thu, 11 Dec 2003 19:29:21 GMT, "padeen" wrote: Anyone found a source for 12 volt IR detectors? I hope You are joking, as they are all 12V for normal alarm use. /Marcus -- Marcus AAkesson Gothenburg Callsigns: SM6XFN & SB4779 Sweden Keep the world clean - no HTML in news or mail ! |
12V IR Detectors?
Marcus, are you capable of understanding that your post reveals our combined
ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? Padeen "Marcus AAkesson" wrote in message ... On Thu, 11 Dec 2003 19:29:21 GMT, "padeen" wrote: Anyone found a source for 12 volt IR detectors? I hope You are joking, as they are all 12V for normal alarm use. /Marcus -- Marcus AAkesson Gothenburg Callsigns: SM6XFN & SB4779 Sweden Keep the world clean - no HTML in news or mail ! |
12V IR Detectors?
"padeen" wrote in message
... Marcus, are you capable of understanding that your post reveals our combined ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? Well, I think Marcus is right. I think it would be fair to say that ALL IR sensors for alarm applications are 12V, since it doesn't make sense to run an alarm sensor at 120V when it will be connected to an alarm system that works on low voltage. I think the 120V or 240V types you refer to are the ones used to control a light. And you don't want to use these for an alarm system because they react on anything. The alarm types are better in discriminating between events that are important (moving people) and not important (moving small animals for instance). Meindert |
12V IR Detectors?
"padeen" wrote in message
... Marcus, are you capable of understanding that your post reveals our combined ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? Well, I think Marcus is right. I think it would be fair to say that ALL IR sensors for alarm applications are 12V, since it doesn't make sense to run an alarm sensor at 120V when it will be connected to an alarm system that works on low voltage. I think the 120V or 240V types you refer to are the ones used to control a light. And you don't want to use these for an alarm system because they react on anything. The alarm types are better in discriminating between events that are important (moving people) and not important (moving small animals for instance). Meindert |
12V IR Detectors?
The 120V sensors will control anything you want them to control, and have
considerable adjustment capabilities so as not to "react on anything", including small animals, wind-propelled trees, or street traffic. But of course all 12V alarm systems would have 12V sensors! However, I would expect that the internal sensor electronics for both 12 and 120V is essentially similar, with the difference being only in the PS & switch. Padeen "Meindert Sprang" wrote in message ... "padeen" wrote in message ... Marcus, are you capable of understanding that your post reveals our combined ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? Well, I think Marcus is right. I think it would be fair to say that ALL IR sensors for alarm applications are 12V, since it doesn't make sense to run an alarm sensor at 120V when it will be connected to an alarm system that works on low voltage. I think the 120V or 240V types you refer to are the ones used to control a light. And you don't want to use these for an alarm system because they react on anything. The alarm types are better in discriminating between events that are important (moving people) and not important (moving small animals for instance). Meindert |
12V IR Detectors?
The 120V sensors will control anything you want them to control, and have
considerable adjustment capabilities so as not to "react on anything", including small animals, wind-propelled trees, or street traffic. But of course all 12V alarm systems would have 12V sensors! However, I would expect that the internal sensor electronics for both 12 and 120V is essentially similar, with the difference being only in the PS & switch. Padeen "Meindert Sprang" wrote in message ... "padeen" wrote in message ... Marcus, are you capable of understanding that your post reveals our combined ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? Well, I think Marcus is right. I think it would be fair to say that ALL IR sensors for alarm applications are 12V, since it doesn't make sense to run an alarm sensor at 120V when it will be connected to an alarm system that works on low voltage. I think the 120V or 240V types you refer to are the ones used to control a light. And you don't want to use these for an alarm system because they react on anything. The alarm types are better in discriminating between events that are important (moving people) and not important (moving small animals for instance). Meindert |
12V IR Detectors?
On Thu, 11 Dec 2003 19:29:21 GMT, padeen wrote:
Anyone found a source for 12 volt IR detectors? Pretty sure you can buy them from Eastern Distributors since you're an electrician. They're available from all the alarm wholesalers - Ademco, Tri-State, etc. - but they might not be willing to sell to you without a bunch of rigamarole. -- Larry email is rapp at lmr dot com |
12V IR Detectors?
On Thu, 11 Dec 2003 19:29:21 GMT, padeen wrote:
Anyone found a source for 12 volt IR detectors? Pretty sure you can buy them from Eastern Distributors since you're an electrician. They're available from all the alarm wholesalers - Ademco, Tri-State, etc. - but they might not be willing to sell to you without a bunch of rigamarole. -- Larry email is rapp at lmr dot com |
12V IR Detectors?
On Fri, 12 Dec 2003 10:31:03 GMT, "padeen"
wrote: Marcus, are you capable of understanding that your post reveals our combined ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? No offense meant! I'm very well aware of all the AC (here 230V) IR sensors around, but as the subject of the main thread was "Burglar alarms", the field of application was pretty much given. Since a fundamental requirement of alarm systems is to run on backup power, everything is DC (usually 12V), just like in a boat (how convenient) ! I have a boat alarm based on switches and an IR sensor and haven't had any problems with false alarms. There are many nice products in the market, and the latest offer positioning, alarm and remote control by GSM/SMS. You can check the wind conditions from work, and then decide to go out or not. Nice. http://www.seakey.com/indexe.htm http://www.boatgard.com/en/index.htm /Marcus -- Marcus AAkesson Gothenburg Callsigns: SM6XFN & SB4779 Sweden Keep the world clean - no HTML in news or mail ! |
12V IR Detectors?
On Fri, 12 Dec 2003 10:31:03 GMT, "padeen"
wrote: Marcus, are you capable of understanding that your post reveals our combined ignorance? I'm an electrician who's been installing 120V IR sensors for many years, but haven't had any alarm experience. You, on the other hand, see the world from the 12V side. Shall we both broaden our knowledge? No offense meant! I'm very well aware of all the AC (here 230V) IR sensors around, but as the subject of the main thread was "Burglar alarms", the field of application was pretty much given. Since a fundamental requirement of alarm systems is to run on backup power, everything is DC (usually 12V), just like in a boat (how convenient) ! I have a boat alarm based on switches and an IR sensor and haven't had any problems with false alarms. There are many nice products in the market, and the latest offer positioning, alarm and remote control by GSM/SMS. You can check the wind conditions from work, and then decide to go out or not. Nice. http://www.seakey.com/indexe.htm http://www.boatgard.com/en/index.htm /Marcus -- Marcus AAkesson Gothenburg Callsigns: SM6XFN & SB4779 Sweden Keep the world clean - no HTML in news or mail ! |
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