Alarmline Analogue

Thông tin chi tiết

– Alarmline Analogue cable senses temperature variations by continuously
monitoring the resistance of specially doped Negative Temperature Coefficient
(N.T.C.) polymeric insulation. A change in temperature produces a relative
change in resistance between the two loops within the sensor cable – as
temperature increases, resistance is lowered.
This change is monitored by an
Alarmline LHD4 control unit, which actuates an alarm signal at a
pre-determined level. The integrating effect of Alarmline sensor cable
enables it to detect either a hot spot or a lower level of temperature
increase over its total length.
Provided the sensor cable has not been directly subjected to temperatures
greater than 120°C for excessive periods, it will recover to an alert
condition after activating an alarm.
Upon destruction, Alarmline fails permanently into the alarm state.
Benefits

– Flexible in installation
– Recoverable after operation
– Monitors precise point of risk
– Sensitive to small temperature
variations
– Mechanical/environmental
protection options
Applications
– Rack storage
– Escalators
– Cable trays
– Conveyors
– Floating roof tanks
– Covered car parks

Approvals

Vds (via Kidde Deugra)
FM Global
FM.0M3A0.AY and FM.OR5A4.AY
Chinese Approval (Shenyang)
Alarmline analogue sensor cables are approved for use by UK Power
Generation Industry (formerly CEGB)
Approval and Distribution Authorities under their Reference: EPA215 High
Resistance Sensor
Alarmline Analogue sensor consists of a 4-core cable. Two of the four colourcoded conductors are insulated with a
Negative Temperature Coefficient
(NTC) material. The other two conductors have normal PVC
insulation. The cores are twisted together and protected by an outer sheath of high temperature, flameretardant PVC insulation (see Fig. 1)


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