MD Series Digital Type Linear Heat Detector–UL Approval
MD Series Digital Linear Heat Detectors :
Description:
This kind of Digital Linear Heat Detector provides a very-early alarm detecting function to the protected environment. The detector can be known as an intelligent “switch” type detector. The polymers between the two conductors will break down at specific fixed temperature allowing the conductors contact, the short circuit will intimate the alarm. The detector has a continuous sensitivity. The sensitivity of linear heat detector will not be influenced by the environment temperature changing and the length of detection cable using. It does not need to be adjusted and compensation. The detector can transfer both alarm and fault signals to control panels normally with DC24V.
Technology Principle:
The polymers between the two conductors will break down at specific fixed temperature allowing the conductors contact, the short circuit will intimate the alarm.
Technology advantages:
● Industrial safety design
● Electrical interface with low power consumption design
● Real-time monitoring
● Fast response time
● No alarm temperature compensation needed
● Compatible to any kind of fire alarm system
● Alarm temperatures: 68℃, 88℃, 105℃, 138℃ .
Introduction of Linear Heat Detection Cable:
Intertwisting two rigid metallic conductors which are covered by NTC heat sensitive material, with insulative bandage and outer jacket, here comes the digital type LHD Cable, and the different models depend on the variety of materials of outer jackets to meet different special environments.
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Technical data |
MD 68℃ |
MD88℃ |
MD105℃ |
MD 138℃ |
UL APPROVAL |
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Type |
Conventional/ CR/OD/ EP |
Conventional/ CR/OD /EP |
Conventional/ CR/OD /EP |
Conventional/ CR/OD /EP |
✓ |
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Levels |
Ordinary |
Intermediate |
Intermediate |
High |
✓ |
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Alarming temperature |
68℃ |
88℃ |
105℃ |
138℃ |
✓ |
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Max. Storage temperature |
45℃ |
45℃ |
70℃ |
70℃ |
✓ |
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Working temperature |
-40℃~ +45℃ |
-40℃~ +60℃ |
-40℃~ +75℃ |
-40℃~ +93℃ |
✓ |
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Acceptable Deviations |
±3℃ |
±5℃ |
±5℃ |
±5℃ |
✓ |
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Responding time Max. (s) |
10 |
10 |
15 |
20 |
✓ |
Introduction of LHD Control Unit:
Control Unit MD-CU-D is used for MD series digital type Linear Heat Detection Cable. (the Explosion-proof tank and Safety barrier med to come with MD-CU-D for EP type). The function is to monitor the signal changes of Linear Heat Detection Cable and it can be connected to the Fire Alarm Control Panel.
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Technical data |
MD-CU-D |
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Operating voltage |
24V DC |
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Allowed voltage range |
16V DC-26V DC |
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Current |
Standby current |
≤20mA |
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Fire current |
≤35mA |
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Fault current |
≤25mA |
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Status indicator |
Running |
Green light always on |
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Fire alarm |
Red light always on |
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Fault |
Yellow light always on |
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Operating temperature |
Environment temp. |
-45℃-+60℃ |
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Relative humidity |
≤95％ |
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Application Length |
No longer than 500m |
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Dimensions(L*W*H) |
90*85*52mm |
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For indoor use only |
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Introduction of LHD EOL Box:
EOL Box is used for MS1000, MS1000 CR/OD and MS1000 EP digital Linear Heat Detection Cable. The function is to balance the signal of Linear Heat Detection Cable.
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Technical data |
MD-EOL-D |
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Operating voltage |
No electronics |
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Operating temperature |
Environment temp. |
-45-+60℃ |
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Relative humidity |
≤95％ |
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Dimensions(L*W*H) |
90*85*52mm |
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Notice |
“Fire Test” “Fault Test” push buttons are for testing use only For indoor use only |
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Applications:
●Cable tray, Cable tunnel, Cable trench, High-voltage cable.
●Highway tunnel, Subway tunnel, Dam.
●Rail tunnel, Utility tunnel.
●Convey belt, Coal conveyor, Coal storage yard.
●Oil tank, Gas tank, Oil convey pipeline, Gas pipeline.
●Warehouse, etc.
Application fields
