The invention relates to a multi-channel tubular linear
temperature sensing fire detector which is characterized in that a detection circuit is connected with a
current collector via a common joint; two common terminals of the
current collector respectively are connected with input terminals of a
metal gas pump and a
pressure sensor; the other terminal of the
pressure sensor is connected with a reference chamber; the
pressure sensor is connected with a CPU via a first circuit; the CPU is connected with a multi-channel
signal output terminal via a third circuit, and with a linear stepped
micromotor via a second circuit; and a pressure emulation generator and the
current collector are disposed on a mounting plate which is fixed in a box body. The invention can be used for early detecting overtemperature of various industrial devices or articles in a harsh environment, monitoring abnormal temperature due to spark, self-
combustion, etc. and combining with an automatic fire extinguishment
system. Alarm temperature, temperature raising rate and sensitivity of the
fire detector can be set and regulated. The invention has the advantages of reduced
engineering device numbers, increased protection area, lowered device investment, and reduced artificial mounting cost.