CN113450526A - Temperature-sensing fire detector - Google Patents
Temperature-sensing fire detector Download PDFInfo
- Publication number
- CN113450526A CN113450526A CN202110956570.8A CN202110956570A CN113450526A CN 113450526 A CN113450526 A CN 113450526A CN 202110956570 A CN202110956570 A CN 202110956570A CN 113450526 A CN113450526 A CN 113450526A
- Authority
- CN
- China
- Prior art keywords
- temperature
- conductive wire
- fire detector
- terminal
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012545 processing Methods 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 abstract description 26
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
Abstract
The invention discloses a temperature-sensing fire detector, comprising: a signal processing device; the temperature sensing cable comprises a terminal device and a temperature sensing cable containing at least two conductive wires, wherein the terminal device comprises a temperature measuring unit; the temperature-sensing fire detector can determine the real temperature and the temperature rise rate of the environment where the temperature-sensing cable is located through the temperature measurement function provided by the temperature measurement unit of the terminal device, so that the accuracy of fire judgment is improved, and the error rate is reduced.
Description
Technical Field
The invention relates to the technical field of detectors, in particular to a temperature-sensing fire detector, and particularly relates to a temperature-sensing fire detector with a terminal temperature measuring function.
Background
The cable type linear temperature-sensing fire detector is widely applied to fire detection of power cables in industrial places. The general cable type line type temperature-sensing fire detector is composed of a signal processing device, a temperature-sensing cable and a terminal device including a terminal resistance unit. Two ends of the temperature sensing cable are respectively connected with the signal processing device and the terminal device to form a closed signal acquisition circuit.
Fig. 1 is a block diagram illustrating a conventional cable-type line-type temperature-sensitive fire detector. The temperature-sensing fire detector consists of a signal processing device 1, a temperature-sensing cable 2 at least comprising two wire cores and a terminal device 3 comprising a terminal resistance unit 4. Two ends of the temperature sensing cable 2 are respectively connected with the signal processing device 1 and the terminal device 3 to form a closed signal acquisition processing circuit. However, the terminal device 3 only includes the terminal resistor unit 4, the signal processing device 1 detects the resistance change between the two wire cores of the temperature sensing cable at any time, and the resistance of the temperature sensing cable 2 is not only related to the heated temperature but also related to the heated length and the use length.
In practical application, generally, the protection range of the cable type linear temperature-sensing fire detector is relatively large, the service length of the temperature-sensing cable is about 200 meters, and the temperature detected by the cable type linear temperature-sensing fire detector is related to the heated length of the temperature-sensing cable, so that the displayed temperature is an average temperature in a certain length range and is not the real temperature of the environment, and a false fire alarm which is easily triggered by misjudgment of a signal processing device is judged by using single data.
Accordingly, there is a need for an improved cable-type line-type temperature-sensitive fire detector.
Disclosure of Invention
Therefore, the invention provides a temperature-sensing fire detector, which aims to solve the problem that the temperature-sensing fire detector in the prior art adopts single data to judge false fire alarm which is easy to cause misjudgment of a signal processing device.
In order to achieve the above purpose, the invention provides the following technical scheme:
according to the present invention, there is provided a temperature sensitive fire detector including: a signal processing device; the temperature sensing cable comprises a terminal device and a temperature sensing cable containing at least two conductive wires, wherein the terminal device comprises a temperature measuring unit; the at least two conductive wires comprise at least one positive conductive wire and at least one negative conductive wire, and the positive conductive wire and the negative conductive wire are respectively connected with the signal processing device and the terminal device.
Further, the terminal device further comprises a terminal resistance unit, and the terminal resistance unit and the temperature measuring unit are connected to the positive conducting wire and the negative conducting wire in parallel.
Further, the surfaces of the positive conductive wire and the negative conductive wire are both coated with a material layer.
Further, the termination resistance unit includes a resistor and a first diode, and the resistor and the first diode are connected in series.
Further, the temperature measuring unit comprises a thermistor and a second diode, the thermistor is connected with the second diode in series, and the anode of the first diode and the cathode of the second diode are connected to the positive conducting wire terminal of the terminal device.
Furthermore, the signal processing device comprises a temperature measurement acquisition unit and a signal acquisition and processing unit, and the temperature measurement acquisition unit and the signal acquisition and processing unit are in communication connection in a wired or wireless mode.
The invention has the following advantages:
the temperature-sensing fire detector can determine the real temperature and the temperature rise rate of the environment where the temperature-sensing cable is located through the temperature measurement function provided by the temperature measurement unit of the terminal device, so that the accuracy of fire judgment is improved, and the error rate is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural diagram of a conventional cable-type linear temperature-sensitive fire detector;
FIG. 2 is a schematic diagram illustrating a temperature sensitive fire detector in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram illustrating a temperature sensitive fire detector in accordance with another exemplary embodiment;
in the figure: 1. the temperature-sensing device comprises a signal processing device, 2, a temperature-sensing cable, 3, a terminal device, 4, a terminal resistor unit, 5, a temperature-sensing unit, 6, a temperature-sensing acquisition unit, 7, a signal acquisition and processing unit, 8, a positive conducting wire, 9, a negative conducting wire, 10, a material layer, 11, a resistor, 12, a first diode, 13, a thermistor, 14, a second diode, 15, a temperature-sensing wire, 16 and an insulating layer.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
According to an embodiment of the present invention, there is provided a temperature-sensitive fire detector, as shown in fig. 2, including: a signal processing device 1; the temperature sensing device comprises a terminal device 3 and a temperature sensing cable 2 containing at least two conductive wires, wherein the terminal device 3 comprises a temperature measuring unit 5; the at least two conductive wires comprise at least one positive conductive wire 8 and at least one negative conductive wire 9, and the positive conductive wire 8 and the negative conductive wire 9 are respectively connected with the signal processing device 1 and the terminal device 3.
The temperature-sensing fire detector can determine the real temperature and the temperature rise rate of the environment where the temperature-sensing cable 2 is located through the temperature measurement function provided by the temperature measurement unit 5 of the terminal device 3, improves the accuracy of fire judgment, and reduces the error rate
The terminal device 3 may be in the form of a terminal box, for example, to be compatible with a conventional temperature-sensitive fire detector, and the terminal device 3 further includes a terminal resistance unit 4, and the terminal resistance unit 4 and the temperature measuring unit 5 are connected in parallel to the positive conductive wire 8 and the negative conductive wire 9. Each of the positive conductive wire 8 and the negative conductive wire 9 has one end connected to the positive conductive wire terminal and the negative conductive wire terminal of the signal processing device 1, respectively, and the other end connected to the positive conductive wire terminal and the negative conductive wire terminal of the terminal device 3, respectively.
The surfaces of the positive conductive wire 8 and the negative conductive wire 9 are both coated with a material layer 10. The material layer 10 may be a temperature sensitive material, fusible insulating material, having for example NTC heat sensitive properties. Of course, the positive conductive line 8 and the negative conductive line 9 may not be coated with any material. The outermost layer of the temperature sensing cable 2 is a sheath layer for protecting the conductive wire.
The termination resistance unit 4 includes a resistor 11 and a first diode 12, and the resistor 11 and the first diode 12 are connected in series.
The temperature measuring unit 5 comprises a thermistor 13 and a second diode 14, the thermistor 13 is connected with the second diode 14 in series, and the anode of the first diode 12 and the cathode of the second diode 14 are connected to the positive conducting wire terminal of the terminal device 3. One end of the thermistor 13 is connected in series with the anode of the second diode 14. The anode of the first diode 12 and the cathode of the second diode 14 are connected to a positive conductive line terminal of the terminal device 3, and the other ends of the resistor 11 and the thermistor 13 are connected to a negative conductive line terminal of the terminal device 3. The terminating resistance unit 4 may for example be in the form of a terminating resistor or other equivalent circuit. The temperature measuring unit 5 may be a combination of elements for sensing temperature, a thermistor, a thermal diode and/or other elements.
The signal processing device 1 comprises a temperature measurement acquisition unit 6 and a signal acquisition and processing unit 7, wherein the temperature measurement acquisition unit 6 is in communication connection with the signal acquisition and processing unit 7 in a wired or wireless mode. The temperature measurement acquisition unit 6 and the signal acquisition and processing unit 7 can be connected in parallel to the positive conductive wire 8 and the negative conductive wire 9 of the temperature sensing cable 2 through the positive terminal and the negative terminal of the signal processing device 1, respectively.
When the temperature-sensing fire detector normally operates, the signal acquisition and processing unit 7 sends out positive voltage which is transmitted to the positive terminal of the terminal device 3 through the positive conducting wire 8 of the temperature-sensing cable 2, the temperature measuring unit 5 is not conducted because the second diode 14 is reversely connected, the positive connection current of the first diode 12 flows through the first diode 12 and the resistor 11 from the negative terminal of the terminal device 3, and the negative conducting wire 9 of the temperature-sensing cable 2 flows back to the signal acquisition and processing unit 7.
When the resistance value between the positive conductive wire 8 and the negative conductive wire 9 of the temperature-sensitive cable 2 is used as the electrical parameter, the resistance value between the positive conductive wire 8 and the negative conductive wire 9 detected by the signal acquisition and processing unit 7 is calculated corresponding to the detection result of the resistance value of the thermosensitive material between the positive conductive wire and the negative conductive wire. If the resistance value of the terminating resistor unit 4 is known, the resistance value of the thermosensitive material can be calculated from the detection result of the resistance value, and the ambient temperature of the temperature-sensitive cable 2 can be calculated from the electrical characteristics of the thermosensitive material.
When the signal acquisition and processing unit 7 samples t1 time, the signal acquisition and processing unit 7 controls to cut off the sampling path to access the temperature measurement acquisition unit 6 to sample signals, at this time, the temperature measurement acquisition unit 6 outputs voltage through the negative terminal of the signal processing device 1 to the negative terminal of the terminal device 3 through the negative conductive wire 9 of the temperature sensing cable 2, the terminal resistance unit 4 is not conducted because the first diode 12 is connected in reverse direction, the current connected in forward direction of the second diode 14 flows from the positive terminal of the terminal device 3 through the thermistor 13 and the second diode 14, and the positive conductive wire 8 of the temperature sensing cable 2 flows back to the temperature measurement acquisition unit 6. After the time t2, the signal acquisition and processing unit 7 controls to cut off the sampling path of the temperature measurement acquisition unit 6 and then connects back the signal acquisition and processing unit 7 for signal sampling, and the two signals are sampled in turn.
The signal processing device 1 obtains the two signals and comprehensively judges, and if the two signals do not exceed the set threshold value, the temperature-sensitive fire detector displays a normal monitoring state.
When the ambient temperature is sufficiently high even to exceed the melting temperature of the material layer 10 of the temperature-sensitive cable 2 and/or the resistance value of the NTC thermosensitive material is lowered due to a fire at a part or all of the position of the temperature-sensitive cable 2, an electrical parameter such as the resistance value between the positive and negative conductive wires is rapidly changed, and the thermistor 13 is changed due to an increase in the ambient temperature. The signal collecting and processing unit 7 of the signal processing device 1 can comprehensively judge whether a fire occurs based on the detected rapid change of the electrical parameter and the environmental temperature change detected by the temperature measurement collecting unit 6, and output a fire alarm signal if the set conditions are met. At the moment, the temperature-sensing fire detector is in a fire alarm state.
Example 2
In this example, the temperature-sensitive fire detector includes a temperature-sensitive cable 2 having at least three conductive cores, at least three conductive cores of the temperature-sensitive cable 2 include a positive conductive wire 8, a negative conductive wire 9, and a temperature-measuring wire 15, one end of each of the positive conductive wire 8, the negative conductive wire 9, and the temperature-measuring wire 15 is respectively connected to the positive conductive wire terminal, the negative conductive wire terminal, and the temperature-measuring wire terminal of the signal processing device 1, and the other end is respectively connected to the positive conductive wire terminal, the negative conductive wire terminal, and the temperature-measuring wire terminal of the terminal device 3.
The temperature measurement acquisition unit 6 and the signal acquisition and processing unit 7 can be respectively connected to the positive conductive wire 8 and the negative conductive wire 9 of the temperature sensing cable 2 and the temperature measurement wire 15 through the positive terminal and the negative terminal of the signal processing device 1 and the temperature measurement terminal, and the temperature measurement acquisition unit 6 and the signal acquisition and processing unit 7 are in communication connection, for example, in a wired or wireless manner, so as to transmit temperature signals or other control signals.
When the temperature-sensing fire detector normally operates, the signal acquisition and processing unit 7 sends out positive voltage to the positive terminal of the terminal device 3 through the positive conducting wire 8 of the temperature-sensing cable 2, current flows from the negative terminal of the terminal device 3 through the resistor 11, and the negative conducting wire 9 of the temperature-sensing cable 2 flows back to the signal acquisition and processing unit 7.
When the resistance value between the positive conductive wire 8 and the negative conductive wire 9 of the temperature-sensitive cable 2 is used as the electrical parameter, the resistance value between the positive conductive wire 8 and the negative conductive wire 9 detected by the signal acquisition and processing unit 7 is calculated corresponding to the detection result of the resistance value of the thermosensitive material between the positive conductive wire and the negative conductive wire. If the resistance value of the terminating resistor unit 4 is known, the resistance value of the thermosensitive material can be calculated from the detection result of the resistance value, and the ambient temperature of the temperature-sensitive cable 2 can be calculated from the electrical characteristics of the thermosensitive material.
Meanwhile, the temperature measurement acquisition unit 6 outputs voltage through the temperature measurement terminal of the signal processing device 1 to the temperature measurement terminal of the terminal device 3 through the temperature measurement line 15 of the temperature sensing cable 2, current flows from the negative terminal of the terminal device 3 through the thermistor 13, and the negative conductive wire 9 of the temperature sensing cable 2 flows back to the temperature measurement acquisition unit 6.
The signal processing device 1 obtains the two signals and comprehensively judges, and if the two signals do not exceed the set threshold value, the temperature-sensitive fire detector displays a normal monitoring state.
When the ambient temperature is sufficiently high even to exceed the melting temperature of the fusible insulation material layer 10 in the temperature-sensitive cable 2 and/or the resistance value of the NTC heat-sensitive material is lowered due to a fire at a part or all of the position of the temperature-sensitive cable 2, a rapid change in an electrical parameter such as the resistance value between the positive and negative conductive wires occurs while the thermistor 13 is changed due to an increase in the ambient temperature. The signal collecting and processing unit 7 of the signal processing device 1 can comprehensively judge whether a fire occurs based on the detected rapid change of the electrical parameter and the environmental temperature change detected by the temperature measurement collecting unit 6, and output a fire alarm signal if the set conditions are met. At the moment, the temperature-sensing fire detector is in a fire alarm state.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. A temperature-sensitive fire detector, comprising: a signal processing device; the temperature sensing cable comprises a terminal device and a temperature sensing cable containing at least two conductive wires, wherein the terminal device comprises a temperature measuring unit; the at least two conductive wires comprise at least one positive conductive wire and at least one negative conductive wire, and the positive conductive wire and the negative conductive wire are respectively connected with the signal processing device and the terminal device.
2. The temperature-sensitive fire detector according to claim 1, wherein the terminal device further comprises a terminal resistance unit, and the terminal resistance unit and the temperature measuring unit are connected in parallel to the positive conductive wire and the negative conductive wire.
3. The temperature-sensitive fire detector according to claim 1, wherein the surfaces of the positive and negative conductive wires are coated with a material layer.
4. The temperature-sensitive fire detector according to claim 2, wherein the termination resistor unit includes a resistor and a first diode, the resistor and the first diode being connected in series.
5. The temperature-sensitive fire detector according to claim 4, wherein the temperature measuring unit includes a thermistor and a second diode, the thermistor and the second diode are connected in series, and an anode of the first diode and a cathode of the second diode are connected to a positive conductive wire terminal of the terminal device.
6. The temperature-sensitive fire detector according to claim 1, wherein the signal processing device comprises a temperature-measuring acquisition unit and a signal acquisition and processing unit, and the temperature-measuring acquisition unit and the signal acquisition and processing unit are in communication connection in a wired or wireless manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110956570.8A CN113450526A (en) | 2021-08-19 | 2021-08-19 | Temperature-sensing fire detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110956570.8A CN113450526A (en) | 2021-08-19 | 2021-08-19 | Temperature-sensing fire detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113450526A true CN113450526A (en) | 2021-09-28 |
Family
ID=77818741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110956570.8A Pending CN113450526A (en) | 2021-08-19 | 2021-08-19 | Temperature-sensing fire detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113450526A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201051024Y (en) * | 2007-11-16 | 2008-04-23 | 上海浦东乐韵电器配件厂 | Novel temperature induction cable |
| US20090059998A1 (en) * | 2007-08-27 | 2009-03-05 | Billy Hou | Multiple temperature resistance characteristic sensing cable and its sensor |
| CN101944264A (en) * | 2010-08-31 | 2011-01-12 | 曾学义 | Cable line type temperature-sensing fire detector |
| CN204288419U (en) * | 2014-12-09 | 2015-04-22 | 江苏中实电子有限公司 | A kind of highly sensitive composite line type temperature sensing fire detector |
| CN204406592U (en) * | 2015-01-20 | 2015-06-17 | 江苏中实电子有限公司 | A kind of cable linear temperature sensing fire detector |
| CN205862505U (en) * | 2016-08-02 | 2017-01-04 | 青岛中阳消防科技股份有限公司 | A kind of many detection circuits line-type heat detector based on thermistor element in parallel |
| CN108877130A (en) * | 2018-08-28 | 2018-11-23 | 首安工业消防有限公司 | Heat fire detector with terminal alarms instruction function |
| CN208737637U (en) * | 2018-08-28 | 2019-04-12 | 首安工业消防有限公司 | Heat fire detector with terminal alarms instruction function |
| CN113108734A (en) * | 2021-04-27 | 2021-07-13 | 河北稳控科技有限公司 | Two-wire vibrating wire sensor with temperature detection function and working method thereof |
-
2021
- 2021-08-19 CN CN202110956570.8A patent/CN113450526A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090059998A1 (en) * | 2007-08-27 | 2009-03-05 | Billy Hou | Multiple temperature resistance characteristic sensing cable and its sensor |
| CN201051024Y (en) * | 2007-11-16 | 2008-04-23 | 上海浦东乐韵电器配件厂 | Novel temperature induction cable |
| CN101944264A (en) * | 2010-08-31 | 2011-01-12 | 曾学义 | Cable line type temperature-sensing fire detector |
| CN204288419U (en) * | 2014-12-09 | 2015-04-22 | 江苏中实电子有限公司 | A kind of highly sensitive composite line type temperature sensing fire detector |
| CN204406592U (en) * | 2015-01-20 | 2015-06-17 | 江苏中实电子有限公司 | A kind of cable linear temperature sensing fire detector |
| CN205862505U (en) * | 2016-08-02 | 2017-01-04 | 青岛中阳消防科技股份有限公司 | A kind of many detection circuits line-type heat detector based on thermistor element in parallel |
| CN108877130A (en) * | 2018-08-28 | 2018-11-23 | 首安工业消防有限公司 | Heat fire detector with terminal alarms instruction function |
| CN208737637U (en) * | 2018-08-28 | 2019-04-12 | 首安工业消防有限公司 | Heat fire detector with terminal alarms instruction function |
| CN113108734A (en) * | 2021-04-27 | 2021-07-13 | 河北稳控科技有限公司 | Two-wire vibrating wire sensor with temperature detection function and working method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201138504Y (en) | Parallel line type temperature-sensing fire disaster detector with discrete temperature sensing switch serially connected with resistor | |
| CN101286263A (en) | Parallel single wire digital temperature sensor fire disaster detector and alarming method | |
| CN102592392A (en) | Linear temperature sensing fire detector and alarm method thereof | |
| CN107545692B (en) | Unrecoverable cable type linear temperature-sensing fire disaster detector | |
| CN101368850A (en) | Multi-temperature impedance characteristic sensing cable and temperature-sensitive detector using the same | |
| CN101667318B (en) | Linear heat fire detector and method for improving non-operating temperature rating | |
| CN113450526A (en) | Temperature-sensing fire detector | |
| CN100504322C (en) | Warning method for linear temperature sensitive detector | |
| CN108877130B (en) | Temperature-sensing fire detector with terminal alarm indication function | |
| CN201262774Y (en) | Linetype heat detector for multi-loop sectional monitoring temperature-sensing electrical signal | |
| CN205722275U (en) | Beyond-retrieve-type cable-type line-type heat fire detector | |
| CN100446045C (en) | Irrecoverable linear temperature sensitive detector and opening alarm method thereof | |
| CN104574768A (en) | Linear temperature-sensing fire detector and alarm method thereof | |
| CN100495456C (en) | Alarming method for linear temperature-sensing fire hazard detector with double fixed temperature alarming threshold value | |
| CN201117046Y (en) | Composite type simulation quantity line-type temperature-sensing fire hazard detector | |
| CN101685570A (en) | Restorable linear heat detector of normally open type rate-of-rise and fixed temperature switches connected in parallel | |
| CN102722955A (en) | Rate-of-rise and fixed temperature fire detector with composition of device and line type temperature-induction | |
| CN100437651C (en) | Short circuit alarming method for non-recoverable linear temperature sensing detector | |
| CN101656010B (en) | Linear temperature sensing fire detector with electronic switch assembly and alarming method thereof | |
| CN201465257U (en) | Line type temperature sensing fire detector with point type temperature sensing element | |
| CN201387657Y (en) | Line type heat fire detector with terminal capacitor | |
| CN101944264A (en) | Cable line type temperature-sensing fire detector | |
| CN101285719A (en) | Linear temperature-sensing fire disaster detector possessing embient temperature and humidity compensate function | |
| CN215265008U (en) | Multicore temperature measurement cable | |
| CN100454348C (en) | Linear temperature-sensing fire detector capable of raising response speed and alarming method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210928 |