Some standard content:
QB/T 2316-1997
This standard is revised based on the original national standard GB3665-1983 for timers of household electric washing machines. During the revision process, the technical requirements and test methods of the original GB3665-1983 were greatly enriched and modified, and the relevant contents of its safety performance were highlighted, and other contents were also revised accordingly.
The main differences between this standard and the original GB3665--1983 are: 1. The precision of the control contact on-off time is specified according to different time periods; 2. The technical requirements and corresponding test methods such as reliability of use, main shaft push-pull strength, installation ear strength, limit block, stop pin strength, cold resistance, heat resistance, high and low temperature action are added; 3. According to the provisions of the national standard for washing machines, the test times of forced cycle life and natural cycle life are modified; the wet heat test time is adjusted; 4. The indicators related to safety performance are clarified and their qualification judgment is strictly enforced; 5. The inspection rules are modified, and the original factory inspection and type inspection are specified more specifically. This standard is proposed by the Quality Standards Department of China Light Industry General Association. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. The drafting units of this standard are: Cangzhou Clock and Watch Factory, Ningbo Timer General Factory, and Clock and Watch Research Institute of China Light Industry General Association. The main drafters of this standard are: Xiao Yuntian, Ma Huiyuan, Yang Honggang, Bai Yinming, Zhao Yanyu, and Ge Yuzhi. This standard will replace GB3665-1983 from the date of implementation. 453
1 Scope
Light Industry Standards of the People's Republic of China
Timers for Household Electric Washing Machines
Spring-type Timers
QB/T2316—1997
This standard specifies the product classification, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of spring-type timers (hereinafter referred to as "timers") used in household electric washing machines. This standard applies to timers used in household electric washing machines (including dehydrators) with spring as the power source and a rated washing capacity of 8kg or less.
2 Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191—1990 Pictorial signs for packaging, storage and transportation
GB/T2423.3-1993 Basic environmental test procedures for electrical and electronic products Test Ca: Constant heat test method GB/T2828—1987 Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB/T2829-1987 Count sampling procedures and sampling tables for periodic inspection (applicable to inspection of production process stability) GB/T5023.1—1985 Polyvinyl chloride with rated voltage of 450/750V and below Polyethylene insulated cables (wires) General provisions GB/T5023.3-1985 Polyethylene fluoride insulated cables (wires) with rated voltages of 450/750V and below Flexible cables (wires) for connection
GB/T14536.1--1993 Household and similar electric automatic controllers Part 1: General requirements 3 Product classification, naming and basic parameters
3.1 Classification
3.1.1 Classification by purpose
a) Washing timer;
b) Dehydration timer.
3.1.2 Classification by structure
a) Single-axis timer (not marked);
b) Double-axis timer (represented by the Roman numeral 1). 3.1.3 Classification by function
3.1.3.1 Washing timers are classified into
a) single-function type (not marked);
b) dual-function type (indicated by Chinese Pinyin S); c) multi-function type (indicated by Chinese Pinyin D). 3.1.3.2 Dehydration timers are classified into
Approved by China Light Industry Association on September 1, 1997
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a) single dehydration type (not marked);
b) spray dehydration type (indicated by Chinese Pinyin P); QB/T 2316.—1997
c) upper drainage dehydration type (indicated by Chinese Pinyin B). All types of timers can be equipped with signal contacts to form a signal type (indicated by Chinese Pinyin F). 3.2 Timer naming
Timer model representation method:
Example:
Factory design serial number (expressed in Arabic numerals)Structural code
Signal code
Function code
Timing range, minutes (expressed in Arabic numerals)Spring type
Household electric washing machine
Timer
Factory design serial number is 1, double-axis structure, with signal contact, multi-function, timing range 15min, spring type, the representation method of household electric washing machine timer is:
DXT15DF1/1
3.3 Basic parameters
3.3.1 Rated voltage: ~220V.
3.3.2 Rated frequency; 50Hz.
3.3.3 Rated current
Washing timer: 2.5A for 5kg and below, 3.5A for 8kg and below; dehydration timer: 1.5A for 5kg and below; 2.5A for 8kg and below; one signal contact: 0.1A,
3.3.4 Load power factor: not less than 0.9.4 Technical requirements
4.1 Operating environment
4.1.1 The ambient temperature is 0~40℃.
4.1.2 The relative humidity of the air is below 95% (when the temperature is 25℃). 4.1.3 There should be no flammable, corrosive gas or conductive dust in the surrounding air. 4.2 Appearance quality
4.2.1 All metal parts should be treated with rust prevention. 4.2.2 The surface of plastic parts should be smooth and uniform in color. There should be no cracks, obvious marks, scratches or defects that affect the strength. 4.3 Installation and external dimensions
4.3.1 The working angle of the main shaft is (310 ± 10) °, and the winding direction is clockwise. 4.3.2 The positioning angle of the functional axis conversion is (60 ± 10). 455
QB/T2316-1997
4.3.3 The diameter of the main shaft and functional shaft extension is 6-.12mm; the extension length of the main shaft and functional shaft is 25mm from the installation plane. 4.3.4 The diameter of the button pin is 42.8.0gmm.
4.3.5 Other installation, external dimensions and tolerances of the timer shall be agreed upon by the supply and demand parties. 4.4 Lead wires and their welding strength
4.4.1 Lead wires shall be multi-strand copper core insulated soft wires that comply with the relevant provisions of GB/T5023.1 and GB/T5023.3. 4.4.2 The nominal cross-sectional area of the lead wires shall not be less than 0.5mm2, and the nominal cross-sectional area of the signal contact lead wires shall not be less than 0.3mm. 4.4.3 Under the premise of ensuring the cross-sectional area, the lead wire core is allowed to adopt the specification of 28/0.15mm. 4.4.4 The length and color of the lead wires shall be manufactured according to user requirements. 4.4.5 The welding strength of the lead wires shall be firm after inspection according to 5.5.3, and the welding points shall not loosen or fall off. 4.5 Working reliability
After inspection according to 5.6, it shall work reliably and without oscillation, and the contacts can open and close normally. 4.6 Timing range, on-off time and accuracy
After inspection according to 5.7, it shall meet the requirements of Table 1. Table 1
Accuracy segment
Segment range
Contact type
Control contact connection
and disconnection time
Accuracy, s
Main contact connection time
Time and accuracy.min
Report contact connection
Time and accuracy, 8
Washing type
Dehydration type
12-2<≤448| |tt||8<151525>25252
25<5555<80
4.7 Operating torque
(1≤17)±2
20±12
(≤5)±1
(5<≤21)±2
After the spindle operating torque (winding torque and forced return torque) and functional axis operating torque are tested according to 5.8, they shall comply with the provisions of Table 2. Slippage is not allowed during operation, that is, when the timer is wound and forced to return, any position can be set. 4.8 Redundant torque
After testing according to 5.9, the spindle redundant torque shall comply with the provisions of Table 2. Table 2
Torque name
Spindle operating torque
Winding torque
Forced return torque
Spindle margin torque
Function axis operating torque
4.9Contact pressure
Washing timer
0.04~0. 40
After testing according to 5.10, the contact pressure shall comply with the provisions of Table 3. 4.10 Contact spacing
After testing according to 5.11, the contact spacing shall comply with the provisions of Table 3. 4.11 Contact resistance
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Dehydration
Spray dehydration
Other dehydration
QB/T 2316—1997
After testing according to 5.12, the contact resistance shall comply with the provisions of Table 3. Table 3
Contact name
Contact pressure, N
Contact distance, mm
Contact resistance, mn
4.12 Assembly firmness of stop pin and button pin
Main contact
After inspection according to 5.13, the main shaft and stop pin and button pin should be firmly connected, not loose or falling off. 4.13 Main shaft push and pull strength
After inspection according to 5.14, the upper cover and base should not have cracks or damage. 4.14 Installation ear strength
After inspection according to 5, 15, the installation ear should not have cracks or damage. 4.15 Limit block and stop pin strength
After inspection according to 5.16, the limit block and stop pin should not have cracks or damage. 4. 16 Vibration resistance
Controlled melting point
Signal contact
After the test in accordance with 5.17, the timer should be able to work normally, the fasteners should not be loose, and the main contact connection time should comply with the provisions of Table 1; the contact pressure should comply with the provisions of Table 3.
4.17 Packaging state drop
After the test in accordance with 5.18, the packaging box should not be damaged to affect the packaging quality, and the timer should not be damaged. 4.18 Heat resistance
After the test in accordance with 5.19, the timer should be able to work normally, the plastic parts should not be deformed or cracked, and the main contact connection time should comply with the provisions of Table 1.
4.19 Cold resistance
After the test in accordance with 5.20, the timer should be able to work normally, the plastic parts should not be deformed or cracked, and the main contact connection time should comply with the provisions of Table 1.
4.20 High temperature action
After testing in accordance with 5.21, the timer should not stop during the cycle. 4.21 Low temperature action
After testing in accordance with 5.22, the timer should not stop during the natural cycle. 4.22 Heat and cold shock resistance
After testing in accordance with 5.23, the timer should be able to continue to work, and the plastic parts should not be deformed or cracked, and should comply with the requirements of Table 4. Table 4
Washing timer
Timer
Spray dehydration
Other dehydration
Spindle operating torque
Spindle margin torque
Main contact connection time
(≤17)±3
(5<≤21)±3
(≤5)±1. 5
4.23 Contact making and breaking capacity
After the test in 5.24, the timer contacts should not be welded and can continue to connect or disconnect current. 4.24 Contact temperature rise
Contact pressure
Main contact ≥0.2
Control and signal contact ≥0.07
QB/T 2316—1997
After the test in accordance with 5.25, the limit temperature rise of the timer contact shall be ≤65K (ambient temperature is 30℃C). 4.25 Forced cycle life
After the test in accordance with 5.26, the timer shall be able to continue to work. 4.26 Natural cycle life
After the test in accordance with 5.27, the timer shall be able to continue to work. 4.27 Insulation resistance
After the insulation resistance of the timer is tested in accordance with 5.28, the insulation resistance value between its live parts and easily accessible non-live metal parts shall be not less than 100 M.
4.28 Electrical Strength
After the electrical strength of the timer is tested in accordance with 5.29, there shall be no flashover or breakdown between its live parts and easily accessible non-live metal parts.
4.29 Moisture and Heat Resistance
After the moisture and heat resistance of the timer is tested in accordance with 5.30, it shall meet the following requirements: a) The insulation resistance between the live parts and the easily accessible non-live metal parts shall not be less than 10M b) The electrical strength test of 50Hz AC and 1250V voltage for 1min between the live parts and the easily accessible non-live metal parts shall not have flashover or breakdown.
5 Test Method
5.1 Test Environmental Conditions
Unless otherwise specified, the test shall be carried out indoors at a temperature of (25±10)℃, a relative humidity of 45% to 75%, with no airflow, heat radiation, or direct sunlight.
5.2 Test instruments
5.2.1 The accuracy of the electrician instrument used for type inspection shall not be lower than 0.5 grade. 5.2.2 The error of the instrument used to measure temperature shall be within ±0.5℃ (including ±0.5℃). 5.2.3 The relative error of the instrument used to measure time shall not be greater than 5%. 5.2.4 The accuracy of the instrument used to measure contact pressure shall not be lower than Grade 4. 5.2.5 The relative error of the instrument used to measure torque shall not be greater than 5%. 5.2.6 The accuracy of the length measuring instrument shall not be lower than Grade 2. 5.3 Appearance quality inspection
Visual inspection under natural light indoors.
5.4 Installation and external dimension inspection
Measure with corresponding length measuring instruments. 5.5 Lead-out wire and welding fastness inspection
5.5.1 The cross-sectional area of the lead-out wire is measured and calculated with a micrometer. The length of the lead-out wire is measured with a steel tape measure. 5.5.2 Visually inspect the color of the lead wire under natural light. 5.5.3 Inspection of the welding fastness of the lead wire
After each lead wire is subjected to a 20N pulling force for 10s, check its solder joint. 5.6 Inspection of working reliability
Put the timer on the test bench with the main shaft in the vertical upward and horizontal positions, and run the full stroke once each time. 5.7 Inspection of timing range, on-off time and accuracy 5.7.1 Test installation position
Measure the time period of the timer with the main shaft in the vertical upward position. 5.7.2 Determination of main contact contact time
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QB/T2316—1997
Rotate the main shaft to the full stroke angle within 2s, with the main contact connected as the time starting point and disconnected as the end point. Measure three times and take the arithmetic mean.
5.7.3 Determination of the on and off time of the control contact
Measure the on and off time of the control contact of the product in different periods within the working range of (120±30)°. Measure three complete cycles continuously and take the arithmetic mean of the corresponding on and off time. 5.7.4 Determination of the on time of the signal contact
Rotate the main shaft clockwise by an angle of not less than 45°, measure the time from the on to the off of the signal contact, measure three times and take the arithmetic mean.
5.8 Operation torque inspection
The operating torque of the main shaft and functional shaft is measured in a horizontal position with a torque meter or a disk and a base code. The working circle diameter of the disk is $40+2mm, the mass is not more than 0.16kg, and the magnetic code moves along the tangent direction of the working circle of the disk. The torque value is calculated according to the code mass and the working circle diameter. The operating torque should be measured after forced return twice, and its value is the maximum value on the full stroke. 5.9 Test of residual torque
The residual torque at a certain position of the main shaft is equal to the external torque that makes the escapement just stop when the timer main shaft is at this position. The direction of this torque is opposite to the direction of the main shaft working torque. The residual torque of the main shaft is measured by a torque meter or according to the value specified in Table 2, using a disc and a code that meet the requirements of 5.8. The method is: the main shaft rotates clockwise by an angle of not less than 45°, so that it naturally returns to the starting position. 5.10 Test of contact pressurebzxZ.net
Use a dynamometer with a device that displays the contact on and off at the center position of the corresponding contact. Each pair of contacts is measured three times and the arithmetic mean is taken. 5.11 Test of contact spacing
Generally visual inspection, if necessary, use a feeler gauge with a device that displays the contact on and off to measure. 5.12 Test of contact resistance
Measure with a contact resistance tester. Contact resistance measurement method: The timer should first be connected to a circuit with rated voltage, rated current, rated frequency, and a power factor of 0.9, and the upper bar should be (60 ± 10) to allow it to naturally return to three, and then recover for no less than 10 minutes, and then use a contact resistance tester to measure the contact resistance of the contacts.
5.13 Inspection of assembly firmness of stop pins and button pins
The main shaft of the timer is fixed horizontally on a pad with a V-groove. A static axial force of 40N is applied in the opposite direction of the axis of the stop pin and button pin for 1 minute.
5.14 Inspection of main shaft push and pull strength
Fix the timer on the bracket, and apply a static pressure and a pull of 150N in the axial direction of the timer for 1 minute each. 5.15 Inspection of the strength of the mounting ears
Fix the base of the mounting ears of the timer horizontally on the bracket, and apply a static pressure of 200N on the base along the axial direction of the timer for 1mina
5.16 Inspection of the strength of the limit block and the stop pin
Measure with a torque meter or a disc and a code that meets the requirements of 5.8. The method is: apply a torque of 1.20N·m in the counterclockwise direction for 1 min.
: 5.17 Vibration resistance test
The timer vibrates for 10min in the front, back, left, right, and up and down directions respectively under the conditions of a full amplitude of 3mm and a frequency of 22Hz. 5.18 Drop test in packaged state
The packaged timer is freely dropped from a height of 100cm to the cement floor in the three directions of up and down, left and right, and front and back, once each. 5.19 Heat resistance test
After the timer is wrapped in a plastic bag, it is placed in an environment of (70±3)°C for 48 hours, then restored at room temperature for 2 hours, and measured according to the installation position. 5.20 Cold resistance test
QB/T2316—1997
After the timer is wrapped in a plastic bag, it is placed in an environment of (-20±3)°C for 48 hours, then restored at room temperature for 2 hours, and measured according to the installation position. 5.21 High temperature action test
After the timer is placed in a (60±5)°C constant temperature box for 30 minutes, it is subjected to 10 continuous natural cycles in the box. 5.22 Low temperature action test
After the timer is placed in a (-10±5)°C constant temperature box for 30 minutes, it is subjected to 10 continuous natural cycles in the box. 5.23 Heat resistance impact test
After the timer is packaged in a plastic bag, it is placed in an environment with a temperature of (60±3)℃ for 1h, and then immediately transferred to an environment with a temperature of (-10±3)℃ and placed for another 1h, which is one cycle. After 5 cycles, it is restored at room temperature for 1h and measured according to the installation position. 5.24 Contact on-off capacity test
The timer contacts are passed through 1.5 times the rated current at the rated voltage, and the load power factor is 0.9. The on-off test (manual simulation is allowed) is carried out 10 times in a row on the natural circulation machine. The timer has a full stroke natural cycle, and the interval between each cycle does not exceed 1min. The load is connected in series with the main contact and the control contact with a long connection time.
5.25 Contact temperature rise test
Measured by thermocouple method. Weld the thermocouple to the back of the static contact in the main contact pair. Under the conditions of rated voltage, rated current, rated frequency and power factor of 0.9, when the timer works continuously until the contact temperature rise is constant, measure it with power on. 5.26 Forced cycle life test
It is carried out on a forced cycle life test machine. Under the conditions of rated voltage, rated current, rated frequency and load power factor of 0.9, the main shaft is at a uniform angular velocity of (10±1) times/min, and the winding angle is not less than 240° each time, and the main contact must be on and off each time. The load is connected in series with the main contact and the control contact with a long connection time. After the forced cycle test? 000 times, it is restored at room temperature for 1h and measured according to the installation position.
5.27 Natural cycle life test
It is carried out on a natural cycle life test machine. Under the conditions of rated voltage, rated current, rated frequency and load power factor of 0.9, the timer is wound at an angle of not less than 240° each time and allowed to return naturally. The load is tested in series with the main contact and the control contact with a long connection time for 5000 times, and the load is tested in series with the main contact and the control contact with a short connection time for 2000 times, for a total of ? 000 times. After the test, recover at room temperature for 1 hour and measure according to the installation position.
5.28 Insulation resistance test
Insulation resistance is carried out according to the test conditions and methods specified in GB/T14536.1. 5.29 Electrical strength test
Electrical strength is tested by applying AC 50Hz, 1500V for 1min according to the test procedures specified in GB/T14536.1.
5.30 Moisture and heat resistance test
The timer is placed continuously for 48 hours according to the test procedures specified in GB/T2423.3 under the environmental conditions of (40±2)℃ and relative humidity of 90%~95%, and then taken out. At room temperature, the surface is immediately wiped dry and the measurement is completed within 3 minutes. 6 Inspection rules
6.1 The timer shall be inspected and qualified by the quality inspection department before it can leave the factory. 6.2 The inspection of the timer is divided into factory inspection and type inspection. 6.3 Factory inspection
6.3.1 Except for the two items of insulation resistance and electrical strength, the factory inspection shall be carried out according to the secondary sampling plan of GB/T2828. 6.3.2 The inspection items, unqualified classification, qualified quality level (AQL) and inspection level (IL) are shown in Table 5. 6.3.3 The composition and batch size of the batch shall be agreed upon by the supply and demand parties. ：460
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Unqualified classification
QB/T2316--1997
Inspection items
Work reliability
Lead wire and its welding fastness
Timing range, on-off time and accuracy
Appearance quality
Installation and overall dimensions
Lead wire and its welding fastness
Operating torque
Ridity
Assembly fastness of stop pin and button pin
Corresponding clauses
4.4.1:4.4.2:4.4.3:4.4.4
6.3.4 The inspection strictness shall be carried out in accordance with the inspection strictness determined in GB/T2828. AQL value
6.3.5 According to the items determined in 6.3.2~6.3.4, the sample size and judgment array are determined according to the retrieval of the sampling plan in GB/T2828. 6.3.6 After the sample is inspected, the judgment of whether the factory inspection is qualified or unqualified shall be carried out according to the judgment provisions of the batch inspection in GB/T2828.
6.3.7 The disposal after the inspection shall be carried out according to the disposal after the batch inspection in GB/T2828. 6.3.8 The two safety requirements of insulation resistance and electrical strength in the factory inspection shall be inspected by random inspection, with one sampling, and the qualified judgment number is zero. The sample size of the random inspection shall be agreed upon by the supply and demand parties. The samples inspected must all be qualified for the two inspections. If one sample fails in one item, the factory inspection shall be judged to be unqualified. The manufacturer is allowed to take measures for the unqualified items, and then conduct random inspections after improvement until they are qualified. 6.4 Type inspection
6.4.1 The timer shall be subject to type inspection in any of the following situations: a) Trial design and identification of new products or old products transferred to the factory for production; b) After formal production, if there are major changes in structure, materials, and processes that may affect product performance; c) During normal production, it shall be inspected periodically after a certain amount of production has been accumulated, generally once every two years; d) When the product is resumed after a long period of suspension; e) When there is a significant difference between the factory inspection and the last type inspection; 1) When the national quality supervision agency proposes a requirement for type inspection. 6.4.2 Type inspection shall be carried out in accordance with the provisions of GB/T2829. 6.4.3 Use the discrimination level (DL) I and the one-time sampling plan. 6.4.4 The inspection items, non-conforming classification, sample size and non-conforming quality level (RQL) are shown in Table 6.6.4.5 According to the items determined in 6.4.2 and 6.4.3 above, the sampling plan is searched in GB/T2829, and the results are shown in Table 6.6.4.6 The samples for type inspection shall be randomly selected from a batch or batches that have passed the factory inspection. 6.4.7 During type inspection, the items 1, 2.14, 15 and 16 in Table 6 shall be inspected first, and then divided into six groups, with three in each group. The first group shall be inspected according to items 3, 7, 17 and 18; the second group shall be inspected according to items 5, 21, 22 and 23; the third group shall be inspected according to items 6 and 13; the fourth group shall be inspected according to items 8 and 10; the fifth group shall be inspected according to items 9 and 11; the sixth group shall be inspected according to items 4, 12, 19 and 20. 6.4.8 After the sample is inspected, the judgment of whether the type inspection is qualified or unqualified shall be carried out in accordance with the judgment of whether the type inspection is qualified or unqualified in the mid-term inspection in GB/T2829.
6.4.9 The disposal after the type inspection shall be carried out in accordance with the disposal after the mid-term inspection in GB/T2829. 6.4.10 The type of sampling plan for type inspection can also be agreed upon by the supply and demand parties. 6.4.11 In the type inspection, the three safety requirements of insulation resistance, electrical strength and heat resistance are subject to random inspection. The number of qualified judgments is zero, and the size of the sample for random inspection is agreed upon by both parties. All three tests of the sample for random inspection must be qualified. If one sample fails to pass one of the tests, the type inspection is judged to be unqualified. The manufacturer is allowed to take measures for the unqualified items, and then conduct random inspections after improvement until they are qualified. Table 6
Unqualified classification
Inspection items
Work reliability
Timing range, on-off time and accuracy
Lead wire and its welding strength
Contact resistance
Contact breaking and making capacity
Contact temperature rise
Vibration resistance
High temperature action
Low temperature action
Heat and cold shock resistance
Mandatory Cycle life
Appearance quality
Operating torque
Ridity torque
Assembly firmness of stop pin and button pin
Lead wire and welding firmness
Contact pressure
Contact spacing
Main shaft thrust, tensile strength
Installation ear strength
Limit block and stop pin strength
Applicable terms
4.4.1,4. 4. 2,4.4. 3.4.4.4
The three items of packaged state drop test, natural cycle life test, installation and external dimension inspection shall be agreed upon by both the supplier and the buyer. 2 For each inspection item with a sample number of 3, only one unqualified product is allowed to appear in the inspection. 7 Marking, packaging, transportation, storage
7.1 Each timer shall be marked in a conspicuous position. The marking content is as follows: a) Manufacturer name and registered trademark;
b) Product model;
c) Rated voltage and rated current;
d) Manufacturing date.
7.2 The timer is properly packaged, several timers are packed into a box, and the timers in the box are separated by pads. RQL
7.3 Each packing box contains a packing list and product certificate. The packing box is strong and durable, suitable for long-distance transportation. The following marks are on the surface of the box: a) manufacturing site, factory name and registered trademark; 462
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b) product name and model;
c) gross weight (kg);
d) quantity (pieces):
e) overall dimensions of the packaging box (mm::txbxh);f) date of manufacture;
QB/T 2316-- 1997
g) "handle with care", "upward", "afraid of moisture" and other marks comply with the provisions of GB191. 7.4 When transporting or carrying the timer, it should be protected from rain, moisture, severe vibration or collision. 7.5 The timer should be stored in a well-ventilated warehouse with a temperature of -10℃~40℃ and a relative humidity of no more than 75% without opening the package. There should be no corrosive gas in the surrounding air. 463
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