GB 4716-1993 Technical requirements and test methods for point-type heat-sensing fire detectors
Some standard content:
National Standard of the People's Republic of China
Point type heat sensitive fire detectors
Technical requirements and test methodsfor heat sensitive point type fire detectors1Subject content and scope of application
GB 4716-93
Replaces GB4716-84
This standard specifies the technical requirements, test methods and markings for point type heat sensitive fire detectors (hereinafter referred to as detectors). This standard applies to fixed temperature, differential fixed temperature and differential temperature detectors installed in general industrial and civil buildings. Detectors installed in other environments with special performance should also comply with this standard, except for special technical requirements that should be separately specified by relevant standards. 2 Reference standards
GB2423.1 Basic environmental test procedures for electric and electronic products Test A: Low temperature test method GB2423.3 Basic environmental test procedures for electric and electronic products Test Ca: Constant damp heat test method GB2423.10 Basic environmental test procedures for electric and electronic products Test Fc: Vibration (sinusoidal) test method GB2423.19 Basic environmental test procedures for electric and electronic products Test Kc: Sulfur dioxide test method for contact points and connectors GB6113 Electromagnetic interference measuring instrument
3 Technical requirements
3.1 When a fire occurs in the monitored area and its temperature parameter reaches the preset value, the detector shall output a fire alarm signal and simultaneously activate the detector's alarm confirmation light or other displays with the same function. The display signal shall be maintained until manually restored. 3.2 The distance between the detector's thermistor and the detector's mounting surface shall be greater than 15mm. 3.3 The detector shall undergo the various tests specified in Chapter 4 of this standard and shall meet all the requirements of this standard. 4 Test methods
4.1 General requirements for tests
4.1.1 The tests specified in this standard are type tests. 4.1.2 Resettable detectors shall be tested in accordance with the provisions of Appendix A. Non-resettable detectors shall be tested in accordance with the provisions of Appendix B. 4.1.3 Detectors shall be visually inspected before testing. Testing may only be carried out if they meet the following requirements: a. There shall be no corrosion, coating peeling, blistering, obvious scratches, burrs or other mechanical damage on the surface; b. The text symbols and signs shall be clear and the structure shall not be loose. 4.1.4 If there is no explanation in the relevant clauses, all tests shall be carried out under the following normal test atmospheric conditions: temperature 15~35℃;
relative humidity 45%~～75%;
air pressure 86~106 kPa.
4.1.5 If a test requires the detector to be powered on, the detector shall be powered according to the requirements of the manufacturer or the fire alarm controller provided by the State Administration of Technical Supervision. Approved on April 10, 1993, and implemented on November 1, 1993.
GB4716--93
4.1.6 If there is no description in the relevant clauses, the tolerance of each test data shall be ±5%. 4.1.7 If the operating temperature of the detector is determined by the fire alarm controller, the operating temperature of the detector shall be set to the maximum and minimum limit values respectively through the fire alarm controller during the test. The test results shall meet the requirements of the relevant clauses. 4.2 Response time test
4.2.1 Purpose
To test the response time of fixed temperature and differential fixed temperature detectors and determine the sensitivity level, and to test the response time of differential temperature detectors. 4.2.2 Method
4.2.2.1 Determination of the position of maximum and minimum response time Install the detector in the standard temperature box (see 4.2.4) according to its normal working position and connect it to the control and indicating equipment so that it is in normal monitoring state. Under the condition that the initial airflow temperature of the standard temperature box is 25℃ and the flow rate is 0.8±0.1m/s, the temperature is increased at a rate of 10℃/min, and the response time (the time interval from the start of the measuring element to the action of the detector) is recorded. The measurement error is 0.5. The test is performed 8 times in total. After each test, the detector should be rotated 45° around its vertical axis in the same direction. The position of the maximum and minimum response time of the detector is recorded. Note: 1) The control and indicating equipment can be a fire alarm controller or a special test equipment. 4.2.2.2 Response time test
Install the detector in the standard box (hereinafter referred to as the overflow box) according to its normal working position and connect it to the control and indicating equipment so that it is in normal monitoring state. Under the condition that the initial temperature of the airflow in the incubator is 25℃ and the flow rate is 0.8±0.1m/s, the fixed temperature and differential fixed temperature detectors are heated at a heating rate of 1, 3.5, 10, 20, and 30℃/min respectively; the differential temperature detector is heated at a heating rate of 5, 10.20, and 30℃/min respectively, and the response time is recorded. The measurement error is 0.5s. For each heating rate, the detector shall be tested at its maximum and minimum response time positions.
4.2.2.3 Calibration for environmental testing
a Resettable detectors
According to the provisions of Table A1 in Appendix A, the detectors (excluding the detectors that have been tested for response time) are divided into pairs. In the maximum response time position, the response time of one detector in each pair is measured at a heating rate of 3℃/min (5℃/min for the differential temperature detector) and the other at a heating rate of 20℃/min. Then carry out the tests specified in 4.3~4.7, 4.10, 4.13~4.15. b Non-resettable detectors
Carry out the tests specified in 4.3~4.7, 4.10, 4.13~4.15 according to the detectors or thermistors specified in Table B1 of Appendix B. 4.2.2.4 Action temperature test of fixed temperature and differential fixed temperature detectors The test is carried out with two detectors at the maximum and minimum response time positions respectively. According to the requirements of 4.2.2.2, the air flow humidity in the box is raised to 50C at a heating rate of no more than 1C/min, and then the temperature is continued to rise at a heating rate of no more than 0.2C/min until the detector is activated, and the temperature value when the detector is activated is recorded. 4.2.3 Requirements
4.2.3.1 The response time of constant temperature and differential constant temperature detectors (excluding the response time measured after the test in accordance with Articles 4.3 to 4.10 and Articles 4.13 to 4.15) shall be between the upper and lower limits specified in Table 1. 4.2.3.2 The sensitivity levels of constant temperature and differential constant temperature detectors shall be divided according to the following provisions: a. The response time of the first-level sensitivity detector shall be between the upper and lower limits of the response time of the first-level sensitivity specified in Table 1; c. The response time of the third-level sensitivity detector shall be between the upper and lower limits of the response time of the group-level sensitivity specified in Table 1. 4.2.3.3 When the heating rate of fixed temperature and differential temperature detectors is not more than 1℃/mn, the operating temperature shall be not less than 54℃, and the operating temperature of detectors of various levels of sensitivity shall not be more than the following values: first level sensitivity 62℃; second level sensitivity 70℃: third level sensitivity GB471693. This requirement shall be tested in accordance with the provisions of 4.2.2.4 when necessary. Table 1
Response time of fixed temperature and differential fixed temperature detectors Time lower limit
Heating rate
Sensitivity of each level
1st level sensitivity
Response time upper limit
1st level sensitivity
II level sensitivity
4.2.3.4 After the differential fixed temperature detector is placed in an environment with a starting temperature of 25±5℃ for 30 minutes, it should be activated within 30 seconds when immediately placed in a temperature box with a constant temperature of 54℃ and an air flow rate of 0.8±0.1m/s. 4.2.3.5 The response time of the differential temperature detector (excluding the response time measured after the test according to Articles 4.3 to 4.10 and Articles 4.13 to 4.15) should be between the upper and lower limits specified in Table 2.
Heating rate
4.2.4 Test equipment
Response time of differential temperature detector
Lower limit of response time
Upper limit of response time
The test equipment for checking the response time of the detector is a special standard temperature chamber. The air duct section of the temperature chamber is square and has a horizontal working area. The detector is installed on the top plate of the air duct working area and makes it symmetrical with the two side walls of the air duct. The initial temperature of the air flow in the air duct is 25℃, and the air flow velocity should always be 0.8±0.1m/s during the test. The air flow should be able to heat up at a heating rate of 1.3, 5, 10, 20, and 30C/min respectively; it can also rise to 50℃C at a heating rate of no more than 1C/min, and then rise to 50℃C at a heating rate of no more than 0.The temperature rise rate is 2C/min and the temperature measurement error is 2°C. The airflow near the detector should be guaranteed. The detector should not be affected by the bottom and side walls of the air duct, and should not be directly radiated by the heater. The installation position of the temperature measuring element and the thermistor of the detector should be equal to the distance from the top plate of the air duct, and the temperature measuring element should be located on the windproof side of the detector 230mm away from the vertical axis of the detector in the horizontal direction. The time constant of the temperature measuring element should be less than 2s. The open circuit type temperature box shown in Figure 1 or the closed circuit type temperature box shown in Figure 2 should be used. 351www.bzxz.net
GB4716--93
Figure 1 Schematic diagram of the air duct of the open-circuit thermostat
a air flow guide; b.-temperature measuring element; c detector; d-heating chamber te--section diagram; f-anemometer g-blower, h-air flow inlet 4.3 Vibration test
4.3.1 Purpose
GB 4716-93
Air flow direction
Figure 2 Schematic diagram of the air duct of the closed-circuit thermostat
Control panel; b-heating chamber; c-blower motor; d-manual damper lever; e movable cover; f detector test chamber cover with glass observation window; g-exhaust valve; h rapid cooling air intake valve connected to the exhaust valve Check the adaptability of the detector to withstand vibration and the integrity of its structure. 4.3.2 Method
Install the bases of the two accumulated detectors on the vibration table according to the normal working position. Connect the detector to the control and indication equipment and put it in normal monitoring state. Perform a frequency sweep cycle in the frequency cycle range of 10～150～10Hz on three mutually perpendicular axes in turn, with an acceleration amplitude of 9.81m/s2 and a sweep rate of 1 octave/min, to check whether there is any dangerous frequency. If there is a dangerous frequency, make the detector perform a rated vibration test with an acceleration amplitude of 9.81m/s\ and a duration of 90±1min on each dangerous frequency of the three mutually perpendicular axes; if there is no dangerous frequency, perform a rated vibration test with a frequency of 150Hz, an acceleration amplitude of 9.81m/s2 and a duration of 90±1min on the three mutually perpendicular axes. Then, according to the provisions of Article 4.2, at the maximum response time position, one detector is heated at a rate of 3℃/min (5℃/min for the differential temperature detector) and the other is heated at a rate of 20℃/min to measure the response time. 4.3.3 Requirements
a. During the test, the detector should not send out a fault or fire alarm signal; b. After the test, the detector should not be mechanically damaged or loose at the fastening parts; c. After the test, the change in the detector response time should not exceed 15% or 10 s, whichever is greater. 4.3.4 Test equipment
The test equipment (vibration table and fixture) should comply with the provisions of Article 3.1 of GB2423.10. 4.4 Impact test
4.4.1 Self-test
Test the adaptability of the detector to non-multiple repetitive mechanical impacts and the integrity of its structure. 353
4.4.2 Method
GB 471693
Install a detector and base in the center of the bottom surface of the wooden beam of the impact test equipment (see Figure 3) in its normal working position, and connect the control and indication equipment to put it in normal monitoring state. Adjust the test equipment so that a cylindrical steel block with a mass of 1kg falls vertically from a height of 700mm along the guide device to the center of the top surface of the wooden beam, with an impact area of 18cm (tolerance is ±10%), and falls twice in succession. Test the other detector in the same way. After the test, press 4 .2 stipulates that in the direction of maximum response time, one detector measures the response time at a heating rate of 3℃/min (differential temperature detector at 5C/min) and the other at a heating rate of 20℃/min. This distance must ensure that the detector does not touch the floor 900
Figure 3 Impact test equipment diagram
a1kg steel block;b--guide rod;c-wooden beamd-screws and gaskets;e-wooden support foot;f-detector
4.4.3 Requirements
During the test, the detector does not A fault or fire alarm signal should be issued; a.
b. After the test, the detector should have no mechanical damage and loose fastening parts; after the test, the change in the detector response time should not exceed 15% or 10s, whichever is greater. 4.4.4 Test equipment
The main body of the test equipment (see Figure 3) is a wooden beam support device. The wooden beam can be made of pine wood (or colored wood) with a cross-sectional size of 100mm×50mm. The narrow side of the wooden beam is fixed on two pine wood legs with a width of 50mm, which are placed on a flat cement floor. And it should be high enough so that the detector does not touch the ground. The legs are at right angles to the longitudinal axis of the beam, and the center distance between the two legs is 900mm. 4.5 Impact test
4.5.1 Purpose
To test the adaptability of the detector to withstand mechanical impact. 4.5.2 Method
Install the detector and the base on the rigid horizontal mounting plate of the impact test equipment in their normal working position (see Figure 4), and turn on the control and indicating equipment to put it in normal monitoring state. The detector should be powered on for at least 15 minutes before the test. Adjust the impact test equipment so that the center of the hammer impact surface can hit the detector from the horizontal direction and align it with the part that makes the detector most vulnerable to damage; then, hit the detector with a hammer speed of 1.8±0.15m/s and a collision kinetic energy of 2.7±0.1J. After the collision, according to the provisions of 4.2, in the direction of maximum response time, one detector shall be heated at a rate of 3°C/min (differential temperature detector at 5°C/min), and the other shall be heated at a rate of 20°C/min. 351
4.5.3 Requirements
GB4716-93
a. During and after the test, the detector shall be able to send out an irreversible fault or fire alarm signal; b. If the fault or fire alarm signal cannot be sent out, the change in the detector response time shall not exceed 15% or 10$, whichever is greater.
C. After the test, there shall be no looseness or displacement between the detector and the base, and between the base and the mounting plate. 4.5.4 Test equipment
The main body of the test equipment (see Figure 4) is a pendulum mechanism. The hammer head of the pendulum is made of hard aluminum alloy AlCu.SiMg (solid solution and aging treatment), and its shape is a hexahedron with an inclined collision surface. The pendulum of the hammer is fixed on a steel wheel hub with ball bearings, and the ball bearings are mounted on a fixed steel shaft of a hard steel frame. The structure of the hard steel frame should ensure that the pendulum can rotate freely when the detector is not installed. The overall dimensions of the hammer are 94mm long, 76mm wide and 50mm high. The angle between the chamfer of the hammer and the longitudinal axis of the hammer is 60±1°. The outer diameter of the pendulum of the hammer is 25±0.1mm, and the wall thickness is 1.6±0.1mm. The radial distance between the longitudinal axis of the hammer and the axis of rotation is 305mm, and the axis of the pendulum of the hammer must be perpendicular to the axis of rotation. The steel wheel hub with an outer diameter of 102mm and a length of 200mm is concentrically mounted on a steel shaft with a diameter of 25mm. The accuracy of the diameter of the steel shaft depends on the tolerance of the bearing size used.
Two steel counterweight arms with an outer diameter of 20mm and a length of 185mm are installed in the opposite direction of the steel wheel hub and the pendulum, and their extended length is 150mm. An adjustable counterweight is installed on the two counterweight arms to balance the hammer head with the counterweight arm. An aluminum alloy pulley with a thickness of 12 mm and a diameter of 150 mm is installed on one end of the steel wheel hub. A cable is wound around the pulley. One end of the cable is fixed to the pulley, and the other end is tied to a T-weight.
The horizontal mounting plate for mounting the detector is supported by a steel frame. The mounting plate can be adjusted up and down so that the center of the collision surface of the hammer head hits the detector from the horizontal direction, as shown in Figure 4.
When using the test equipment, first adjust the position of the detector and the mounting plate as shown in Figure 4. After adjustment, fasten the mounting plate to the steel frame, then remove the working weight, and balance the pendulum mechanism by adjusting the counterweight. After adjusting the balance, pull the pendulum to a horizontal position and tie the working weight. When the pendulum mechanism is released, the working weight will cause the hammer head to rotate 3 yuan/2rad to hit the detector. The mass of the working weight is: 0.552/3 yuan
The effective radius of the pulley, m.
When it is 75mm, the mass of the working weight is about 0.78kg, and the mass of the hammer head is about 0.79kg. 355
4.6 Corrosion test
4.6.1 Purpose
GB 4716-93
Figure 4 Collision test equipment diagram
a-Mounting plate; h ~ detector; c--hammer head; d—pendulum; e--steel wheel hub; f ball bearing; g rotate 270°h working weight; j counterweight block; k counterweight arm; [-pulley
Test the detector's ability to resist corrosion.
4.6.2 Method
During the test, the detector and the base are fixed in their normal working position in a test box with a temperature of 40±2℃, a SO concentration of 25±5ppm (volume ratio), and a relative humidity of 90%~95% and subjected to a 21-day test. During the test, the detector is not powered on, and there should be no condensation on it when loading and unloading the detector. After the test, the detector and the base are allowed to recover for 7 days under normal atmospheric conditions. When the detector and the connecting wire are connected intact, according to the provisions of Article 4.2, in the maximum response time direction, one is measured at a heating rate of 3'C/min (differential temperature detector at 5℃/min), and the other is measured at a heating rate of 20C/min. 4.6.3 Requirements
After the test, the change in the detector response time shall not exceed 15% or 10s, whichever is greater. 4.6.4 Test equipment
The test equipment shall comply with the provisions of the appendix in GB2423.19. 4.7 Low temperature test
4.7.1 Purpose
To test the adaptability of the detector to be used in a rapidly cooling and low temperature environment. 356
4.7.2 Method
GB 4716-93
Connect the two detectors to the control and indicating equipment and put them in a normal monitoring state. Keep them in an environment with a temperature of 15~~25℃ and a relative humidity of no more than 70% for 1 hour, and then place them in a low temperature test box with a temperature of -10±3℃ to stabilize for 2 hours (the detectors should not be frozen in the test box).
After the low temperature stabilization period, turn off the control and indicating equipment, take out the detector, and restore it in an environment with a temperature of 15-25℃ and a relative humidity not exceeding 70% for 12 hours. According to the provisions of 4.2, in the direction of maximum response time, only the detector is tested at a humidity increase rate of 3C/min (differential temperature detector is tested at 5C/min), and the other is tested at a temperature increase rate of 20℃/min. 4.7.3 Requirements
a. During the test, the detector should not issue a fault or fire alarm signal; 0. After the test, the change in the detector response time should not exceed 15% or 10s, whichever is greater. 4.7.4 Test equipment
The test equipment (low temperature test chamber) should comply with the provisions of Chapter 4 of the national standard GB2423.1. 4.8 High temperature response test
4.8.1 The
tests the response time of fixed temperature and differential temperature detectors and the adaptability of differential temperature detectors in high temperature environments. 4.8.2 Methods
4.8.2.1 Constant temperature and differential constant temperature detectors
Connect the detector to the control and indicating equipment and put it in the normal monitoring state. Put it in the incubator, and stabilize it for 1 hour under the conditions that the initial temperature of the duct airflow is 25°C and the temperature rises to 50°C at a rate of no more than 1°C/min. According to the provisions of 4.2, measure the response time at the maximum response time position at a rate of 5°C/min. 4.8.2.2 Differential temperature detectors
Connect the detector to the control and indicating equipment and put it in the normal monitoring state. Put it in the incubator, and stabilize it for 2 hours under the conditions that the initial temperature of the duct airflow is 25°C and the temperature rises to 50°C at a rate of no more than 1°C/min. According to the provisions of 4.2, measure the response time at the maximum response time position once at a rate of 5°C/min and once at a rate of 20°C/min. 4.8.3 Requirements
The response time of constant temperature and differential constant temperature detectors shall be between the upper and lower limits of the corresponding sensitivity levels specified in Table 3; the change in the response time of differential temperature detectors shall not exceed 15% or 10s, whichever is greater. Table 3 Response time of constant temperature and differential constant temperature detectors with an initial temperature of 50°C Lower limit of response time
Each level of sensitivity
4.8.4 Test equipment
Temperature box.
4.9 Voltage fluctuation test
4.9.1 National
I level sensitivity
Upper limit of response time
I level sensitivity
Test the adaptability of the detector to work under the conditions of rated working voltage fluctuation. 4.9.2 Method
Physical level sensitivity
When testing resettable detectors, use 1 detector. When testing non-resettable detectors, use 1 detector and 4 thermal sensitive elements. Connect the detector to the control and indicating equipment to put it in normal monitoring state. Reduce the rated working voltage by 15%, or according to the lower limit of the rated working voltage specified by the manufacturer in GB 4716--93. According to the provisions of 4.2, measure the response time of the detector at two heating rates of 3℃/min (5℃/min for differential temperature detector) and 20℃/min at the maximum response time position. Then increase the rated working voltage by 10%, or according to the upper limit of the rated working voltage specified by the manufacturer, and repeat the above test. 4.9.3 Requirements The change in the response time of the detector should not exceed 15% or 10 s, whichever is greater. 4.9.4 Test equipment Temperature box. 4.10 Wet heat test 4.10.1 Purpose To test the adaptability of the detector in wet and hot environment. 4.10.2 Method
After drying the two detectors and their bases in a drying oven at a temperature of 40±5°C for 24 hours, move them immediately to a damp heat test chamber, and connect the detectors to the control and indicating equipment to put them in a normal monitoring state. Adjust the damp heat test chamber so that the detectors are kept at a temperature of 40±2°C and a relative humidity of 90% to 95% for 96 hours, then take them out and move them to an environment with a temperature of 15 to 25°C and a relative humidity of no more than 70%. After one detector is placed for 1 hour, the response time is measured at a temperature increase rate of 3°C/min (5°C/min for differential temperature detectors) in the maximum response time direction 1 according to the provisions of Article 4.2; the response time of the other detector is measured at a temperature increase rate of 20°C/min in the maximum response time direction according to the provisions of Article 4.2 after 72 hours of exposure. In the damp heat test chamber and when transitioning from one environment to another, no condensation should occur on the detector surface. 4.10.3 Requirements
During the test, the detector shall not send out a fault or fire alarm signal. ai
b. After the test, the detector shall not have damage to the coating and corrosion phenomenon; after the test, the change in the detector response time shall not exceed 15% or 10s, whichever is greater. c.
4.10.4 Test equipment
The test equipment (wet heat test chamber) shall comply with the provisions of Chapter 2 of the national standard GB2423.3. 4.11 Insulation resistance test
4.11.1 The insulation performance of the detector shall be tested on the day.
4.11.2 Method
Install the detector and its base on a metal plate (voltage ground terminal) of the insulation resistance test equipment, short-circuit all the contacts of the detector, and apply a DC voltage of 500±50V between the short-circuit point and the metal plate for 60±5s, then measure the insulation resistance. Next, place the detector in a drying oven at 40+5℃ for 6 hours, then place it in a damp heat test box at 40±2℃ and relative humidity of 90%~~95% for 96 hours, then place it in normal test atmosphere for 60*1°min, and immediately measure the insulation resistance according to the above method.
4.11.3 Requirements
The insulation resistance values of the detector measured under the two conditions shall be not less than 100MQ and 1MQ respectively. 4.11.4 Test equipment
The insulation resistance test equipment shall meet the following technical requirements: Test voltage: DC 500±50V (ground terminal is metal plate); Measurement range: 0~500MQ,
Minimum division: 0.1MQ;
Timer: 60±5s.
Note: In the absence of special test equipment, megohmmeter or shake meter can also be used for testing. 4.12 Withstand voltage test
4.12.1
Test the withstand voltage performance of the detector.
4.12.2 Method
GB 4716-93
Place the detector and base in a wet heat test box at a temperature of 25±2℃ and a relative humidity of 90%~~95% for 24 hours, then take them out and install them on a metal plate (voltage ground) of the withstand voltage test equipment. Short-circuit all contacts of the detector and apply the test voltage between the short-circuit point and the metal plate according to the following requirements: a. When the rated working voltage does not exceed 50V:
The test voltage is increased from 0V to 500V at a rate of 100~500V/s and maintained for 60±5s b. When the rated working voltage exceeds 50V:
The test voltage is increased from 0V to 1500V at a rate of 100~500V/s and maintained for 60±55. 4.12.3 Requirements
During the test, the detector should not have surface arcing, sweeping discharge, corona or breakdown. 4.12.4 Test equipment
The withstand voltage test equipment shall meet the following technical requirements: Test power supply: 50Hz, 0~1500V (effective value) continuously adjustable; voltage rise rate: 100~500V/s;
Time: 605$.
4.13 Electrostatic discharge test
4.13.1H
Test the detector's resistance to electrostatic discharge caused by contact with live personnel. 4.13.2 Method
Place the detector on the test grounding plate, and the distance from the edge of the grounding plate should be not less than 100mm. Turn on the control and indicating equipment to put it in normal monitoring state. Xie Jie The output voltage of the electrostatic discharge generator is 8000V. Charge the electrostatic discharge probe connected to the 150pF energy storage capacitor and the 150Q resistor to 8000V, and discharge the detector through the 1500 resistor. After each charge, the electrostatic discharge probe should be immediately touched to a test point on the detector housing. Regardless of whether arc discharge occurs, the probe tip must be in contact with the test point. Electrostatic discharge should be carried out 10 times at different test points on the detector housing (bottom surface and side). The interval between successive discharges should be at least 1$.
After the test, the response time shall be measured at a heating rate of 20C/min at the maximum response time position in accordance with Article 4.2. 4.13.3 Requirements
. During the test, the detector shall not issue a fault or fire alarm signal; after the test, the change in the detector response time shall not exceed 15% or 10s, whichever is greater. 4.13.4 Test equipment
4.13.4.1 Electrostatic discharge generator
Output voltage: 8000V±10%, its electrical schematic diagram is shown in Figure 5, and the typical waveform of the output current for characteristic verification is shown in Figure 6. 339
4.13.4.2 Electrostatic discharge probe
GB 4716—93
100Mo2
Figure 5 Schematic diagram of electrostatic discharge generator
30ns ±3n%
. Discharge probe
. Safety ground wire
Figure 6 Typical waveform of output current of electrostatic discharge generator The discharge end is a sphere of one Pa, and the connector and the rear hemisphere are covered with insulating material. 4.13.4.3 Grounding plate
Dimensions: 450mm×10mm.
4.13.4.4 Grounding wire
The grounding wire of the high-voltage power supply and electrostatic discharge probe used for electrostatic discharge test must be connected to the safety grounding wire of the power plug together with the grounding plate.
4.14 Radiated electromagnetic field test
4.14.1 Purpose
To test the adaptability of the detector in the radiated electromagnetic field environment. 4.14.2 Method
Place the detector and the base on the insulation test bench, connect the control and indicating equipment, and put it in the normal monitoring state. Arrange the test equipment according to Figure 7. Place the transmitting antenna in the middle, and place the detector and the electromagnetic interference measuring instrument antenna 1m on both sides of the transmitting antenna. Adjust the output of the 1~500MHz power signal generator so that the reading of the electromagnetic interference measuring instrument is 10V/m. During the test, the frequency should change slowly within the range of 1~500MHz at a rate of no more than 0.005 octave/s. At the same time, the detector should be rotated to observe and record the working conditions of the detector. If the antenna used is directional, the transmitting antenna should be aligned with the electromagnetic interference measuring instrument antenna first, and the output of the power signal generator should be adjusted to 10V/m, then the position of the antenna should be reversed and aligned with the detector for testing. In the frequency range of 1~500MHz, 360
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