Some standard content:
ICS17.200.20
Standard of the Machinery Industry of the People's Republic of Chinabzxz.net
JB/T8803—1998
Bimetallic Thermometer
Bimetallic Thermometer
Published on September 30, 1998
National Bureau of Machinery Industry
Implemented on December 1, 1998
JB/T8803-1998
This standard is a revision of ZBN11008--88 Industrial Bimetallic Thermometer>. After the revision, the scope of application of the original standard has been expanded from a single industrial bimetallic thermometer to include both industrial and commercial, laboratory and small bimetallic thermometers, and the bimetallic thermometers currently produced in the domestic market, such as those with contact devices, explosion-proof types, and adjustable angle types, have been added. The main differences between this standard and ZBN11008-88 <Industrial Bimetallic Thermometer> in terms of technical content are as follows: a) In the type of product classification, this standard supplements six items such as the main function and connection method of the thermometer; b) In the measurement range, the scope of application is supplemented. In addition to retaining the original industrial use, commercial use, laboratory use and small use are added; c) In the nominal diameter of the dial, in addition to retaining 60, 100, and 150 mm, this standard adds 25, 40, 50, 80, and 120 mm; d) In the accuracy level, this standard supplements 2.0 and 4.0 levels; e) For the newly added contact device, explosion-proof type, and adjustable angle type in this standard, the corresponding technical requirements and test methods are specified. This standard replaces ZBN11008-88 from the date of implementation. This standard is proposed by the National Technical Committee for Industrial Process Measurement and Control Standardization. This standard is under the jurisdiction of the First Sub-Technical Committee of the National Technical Committee for Industrial Process Measurement and Control Standardization. The main drafting unit of this standard: Changzhou Thermal Instrument Factory. Participating drafting units: Hangzhou Automation Instrument Factory, Taixing Thermal Instrument Factory, Hangzhou Chunjiang Instrument Factory, Shanghai Automation Instrument Factory No. 3, Shenyang Temperature Measuring Instrument Factory, Tianchang Instrument Factory, Tianjin Data Control System Co., Ltd. The main drafters of this standard: Fan Peirong, Shi Zhangjian. This standard was first issued in 1988.
1 Scope
Machinery Industry Standard of the People's Republic of China
Bimetallic Thermometer
Bimetallic Thermometer
JB/T8803—1998
Replaces ZBN11008-88
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging and storage of bimetallic thermometers (hereinafter referred to as thermometers).
This standard applies to thermometers with a temperature detection element consisting of a bimetallic element and a protective tube, a circular dial, and a measuring range of -80℃+500℃.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised. The parties using this standard should explore the possibility of using the latest versions of the following standards. GB191--90 Pictorial signs for packaging, storage and transportation
GB4208-93 Protection level of enclosure (IP code) GB6388--86 Shipping and receiving signs for transport packaging GB/T15464--1995 General technical conditions for instrument packaging JB/T7386.1--1994 Terminology of industrial automation instruments Temperature instruments ZBY122--83 Basic types, dimensions and general technical requirements for pointers of industrial automation instruments ZBY123--83 General provisions for scale of industrial automation instruments 3 Definitions
In addition to the terms related to thermometers in JB/T7386.1, this standard also adopts the following definitions. 3.1 Adjustable Angle Bimetallic Thermometer
A bimetallic thermometer that can adjust the angle between the indicating device and the axis of the detection element (0°～90°). 4 Product Classification
4.1 Type
4.1.1 According to the main function of the thermometer, it is divided into: a) indication;
b) indication with contact device (hereinafter referred to as electric contact). 4.1.2 According to the environmental conditions of the thermometer, it is divided into: a) ordinary type;
b) explosion-proof type;
water spray-proof;
d) marine type.
Approved by the State Machinery Industry Bureau on September 30, 1998
Implemented on December 1, 1998
JB/T8803--1998
413 According to the connection position between the thermometer indicating device and the detection element, it is divided into: a
Angle type (axial type). As shown in Figure 1:
Straight type (radial type), as shown in Figure 2:
Obtuse angle type (135 angle type), as shown in Figure 3; adjustable angle type, as shown in Figure 4.
According to the principle of the thermometer's contact device, it is divided into: 4.1.4
Mechanical contact type;
Proximity switch type;
Induction type.
According to the structure of the thermometer's indicating device, it is divided into: no indication adjustment;
with indication adjustment.
According to the installation and connection method of the thermometer, it is divided into:
No fixing device;
External thread joint;
Internal thread pipe joint:
Fixed external thread:
Adjustable pipe joint;
Fixed flange;
Movable flange.
4.2 Basic parameters
Unless the user and the manufacturer agree, the basic parameters of this standard shall be followed. 4.2.1 Nominal dial diameter
The nominal dial diameter of the thermometer is divided into: 25, 40, (50), 60, (80), 100, (120), 150mm. Note: The values in brackets are not recommended.
4.2.2 Measuring range
JB/T8803—1998
The measuring range of the thermometer shall comply with the provisions of Table 1. Table 1
Measurement range
-80-+40
40~+80
Industrial, commercial
Note: "△" in the table indicates applicable measurement diagram, "" indicates inapplicable measurement diagram. 4.2.3 Accuracy level
The accuracy level of thermometer is divided into:
1.0.1.5.2.0,2.5,4.0 level
Laboratory, small
4.2.4 Detection element diameter and installation thread
JB/T8803--1998
The detection element diameter and installation thread of the thermometer shall comply with the provisions of Table 2. Table 2
Nominal diameter of dial
25,40,(50)
60,(80)
100,(120),150
4.2.5 Insertion length
The insertion length of the thermometer is divided into:
75,100.150,200,250,300,400.500mm. 4.2.6 Electrical parameters
Detection element diameter
The electrical parameters of the electric contact thermometer shall comply with the provisions of Table 3. Table 3
Contact form
Mechanical contact type
Proximity switch type
Induction type
4.2.7 Normal working atmospheric conditions
Rated power
The normal working atmospheric conditions of the thermometer shall comply with the provisions of Table 4. Table 4
Workplace
Sheltered place
Outdoor place
-25~+55
-40~+85
Maximum working voltage
Mounting thread
M27×2
Maximum allowable current
Relative humidity
Note: For electric contact thermometer, the normal working atmospheric conditions are: temperature -25C～+55℃, relative humidity ≤85%. 4.3 Nominal working pressure of protection tube
The nominal working pressure of thermometer protection tube is divided into: 1, 1.6, 2.5, 4, 6.3MPa.
5 Technical requirements
5.1 Basic performance
5.1.1 Basic error
JB/T8803—1998
The basic error of the thermometer shall not exceed the basic error limit specified in Table 5. The basic error is expressed as a percentage of the thermometer range. Table 5
Accuracy level
Basic error limit%
5.1.2 Angle adjustment error
The angle adjustment error of the adjustable angle thermometer shall not exceed 1.0% of its range. 5.1.3 Hysteresis
The hysteresis of the thermometer shall not be greater than the absolute value of the basic error limit. 5.1.4 Repeatability
The repeatability limit range of the thermometer shall not be greater than half of the absolute value of the basic error limit 5.1.5 Set point error
Electric contact thermometer, its set point error shall not exceed 1.5 times the basic error limit. 5.1.6 Switching difference
Electric contact thermometer, its switching difference shall not be greater than 1.5 times the absolute value of the basic error limit. 5.1.7 Switching repeatability
Electric contact thermometer, its switching repeatability limit range shall not be greater than half of the absolute value of the basic error limit. 5.1.8 Thermal stability
After the detection element of the thermometer maintains the upper limit of measurement for the time specified in Table 6, its basic error shall still comply with the provisions of 5.1.1. Table 6
Upper limit of measurement
Holding time
5.1.9 Time constant
≤300
The time constant of the thermometer shall not exceed 40s. 5.1.10 Long-term operation performance
The electric contact thermometer is subjected to a closed-open cycle test with a cumulative number of 15,000 times at the maximum allowable current and an interval of 2s5s under the non-inductive load specified in Table 3, and there is no damage. 5.2 Performance affected by working conditions
5.2.1 Vibration resistance
When the mechanical vibration frequency is 25Hz and the displacement amplitude is 0.6rnm, the basic error of the thermometer after being subjected to vibration for 24h should still meet the requirements of 5.1.1 and there is no damage.
5.2.2 Influence of installation position
When tilted 90° forward, backward, left or right from the normal installation position, the change in the indication of the thermometer should not be greater than the absolute value of the basic error limit. 5.3 Safety performance
5.3.1 Insulation resistance
The insulation resistance between the output terminal and the ground terminal (or housing) of the electric contact thermometer and between the output terminals should not be less than the specified value in Table 7.
Rated voltage
5.3.2 Insulation strength
JB/T8803--1998
DC test voltage
Insulation resistance
The insulation strength between the output terminal and the ground terminal (or shell) and between the output terminals of the electric contact thermometer shall be able to withstand the test voltage of the sinusoidal alternating current specified in Table 8 with the same power supply frequency. Table 8
Rated voltage
5.3.3 Explosion-proof performance
Test voltage
The explosion-proof performance of the explosion-proof thermometer shall comply with the regulations of the explosion-proof safety supervision and inspection agency designated by the state. 5.3.4 Protection performance
The shell protection type of the thermometer shall comply with the provisions of GB4208. 5.3.5 Marine performance
The marine performance of the marine thermometer shall comply with the regulations of the Ship Inspection Bureau of the People's Republic of China. 5.4 Appearance
a) The outer surface of the thermometer should be well treated and have uniform color. It should not have defects such as burrs, scratches, cracks, peeling, rust and mildew.
The surface glass or other transparent materials of the thermometer should not have defects such as pores and ripples that affect the reading. c) The pointer, dial and its scale, numbers and symbols of the thermometer should be bright and clear, without discoloration or fading, and should not be defective or have stains that affect the reading.
d) The pointer and dial of the thermometer should comply with the provisions of ZBY120 and ZBY123: The pointer length (the length from the rotation center of the pointer to the tip of the pointer) should comply with the provisions of Table 9; The distance between the pointer indicating part and the dial plane should not be greater than 5mm: The circular scale is a partial circle of 270°~300.
Nominal diameter of dial
Pointer length
6 Test method
6.1 Test conditions
6.1.1 General test atmospheric conditions
Temperature: 15℃35℃;
Relative humidity: 45%～75%;
Atmospheric pressure: 86kPa~106kPa.
6.1.2 Other environmental conditions
JB/T8803-1998
Mechanical vibration: Mechanical vibration should be small enough to be negligible. 6.2 General provisions of the test
6.2.1 The penetration depth of the thermometer should comply with the requirements of the product manual. 6.2.2 Test equipment and standard instrument
The test equipment is a constant temperature bath, and the standard instrument is a second-class standard thermometer. When measuring the temperature of the thermostat, the basic error limit of the measurement system used shall not exceed one quarter of the basic error limit of the test thermometer. 6.3 Basic performance test
6.3.1 General provisions for basic performance test
In addition to complying with the general provisions of the test in 6.2, the basic performance test shall also comply with the following provisions. 6.3.1.1 The basic performance test shall be carried out under the test conditions specified in 6.1. 6.3.1.2 The test points shall include at least four points including the upper and lower limits. Thermometers with zero points shall include the zero point. The test points shall be evenly distributed over the entire measurement range.
6.3.1.3 The detection element of the test thermometer and the standard thermometer are inserted into the thermostat. The temperature of the thermostat shall be stabilized at the specified test point temperature. The standard thermometer shall read the reading, and then the indication of the test thermometer shall be read. 6.3.1.4 The thermometer shall be tested over the entire measurement range, with the upper and lower strokes as a full cycle, and at least one cycle shall be performed. 6.3.2 Basic error test
The basic error test of the thermometer shall be carried out under the general conditions specified for the basic performance test. The difference between the indication of the tested thermometer and the standard thermometer is the basic error of the thermometer at the test point. Note: The basic error test of the adjustable angle thermometer shall be carried out at its angular position. 6.3.3 Angle adjustment error test
The maximum change in the thermometer indication when the adjustable angle thermometer is adjusted from the angular (or straight) position to the straight (or angle) position at room temperature during the test.
6.3.4 Hysteresis test
The hysteresis test of the thermometer shall be carried out simultaneously with the basic error test (except the upper and lower limits of the test point). The difference between the indications of the upper and lower strokes at each test point is the hysteresis of the thermometer. 6.3.5 Repeatability test
The repeatability test of the thermometer shall be carried out in accordance with the general provisions of the basic performance test that are the same as the basic error test. The repeatability limit range of the thermometer is expressed as the maximum difference between the indications of the same stroke (upward or downward) and the same test point in at least three measurement cycles.
6.3.6 Set point error test
6.3.6.1 The set point error test of the electric contact thermometer is carried out under the same general specified conditions as the basic error test, except for the signal circuit and the test point.
6.3.6.2 The test point of the electric contact thermometer is the set point within the set range. According to the test procedure, the test points should include at least three points including the scale lines near 10%, 50%, and 90% of the range. At each test point (set value), the up and down strokes are cycles, and the test should be carried out for at least three cycles. Under the condition that there is no dispute in the judgment, the test can also be carried out by turning the set pointer. 6.3.6.3 Connect the tested electric contact thermometer to the signal circuit, and then change the temperature of the thermostat (temperature change should not be greater than 1C/mip) to make the contact produce a switching action of closing or opening (signal circuit is connected or disconnected). At the moment of action, the standard thermometer reading is the upper switching value or lower switching value of the contact upper stroke or lower stroke. 6.3.6.4 During the test, the input signal must approach the test point in the same direction as the initial input signal, and the upper switching value and the lower switching value are determined by the above three measurement cycles, and the switching median of the upper switching value average and the lower switching value average is calculated. The set point error is determined by the difference between the switching median value and the set value of the scale. 636.5 The set point error test of the electric contact thermometer is allowed to take one cycle during factory inspection. 7
6.3.7 Switching difference test
JB/T8803—1998
The switching difference test is carried out simultaneously with the set point error test. The switching difference is determined by the difference between the average value of the upper switching value and the average value of the lower switching value calculated in the test. 6.3.8 Switching repeatability test
The switching repeatability test is carried out simultaneously with the set point error test. The switching repeatability is determined by the maximum difference between the values of the upper switching value and the maximum difference between the values of the lower switching value measured at the same set value.
6.3.9 Thermal stability test
The detection element of the thermometer is inserted into the constant temperature bath and maintained at the upper limit of the measurement temperature for the time specified in Table 6. During the test, the temperature change of the constant temperature bath does not exceed ±2°C. After the test, measure the basic error of the thermometer according to the test method in 6.3.2. 6.3.10 Time constant test
The detection element of the thermometer is placed in a medium with a lower temperature. After the indication value stabilizes, it is quickly moved to another constant temperature bath with a higher temperature (the temperature difference between the previous medium and the constant temperature bath should be greater than 50% of the thermometer range to form a temperature step). At the same time, start the stopwatch. When the change in the thermometer indication reaches 63.2% of the temperature difference (step value), stop the stopwatch. The time recorded by the stopwatch is the time constant. 6.3.11 Long-term operation performance test
The test is only carried out on the electric contact thermometer. The electric contact thermometer is connected to a special test equipment and tested according to the conditions and parameters specified in 5.1.10. A light bulb is used as a load to check the closing and opening conditions of the contacts. 6.4 Tests on the influence of working conditions on performance
6.4.1 Vibration resistance test
The thermometer is installed on the vibration table according to the manufacturer's instructions. The vibration table, mounting plate and mounting bracket on which the thermometer is installed should have sufficient rigidity to minimize the vibration attenuation or gain transmitted to the thermometer. After the vibration resistance test, measure the basic error of the thermometer according to the test method in 6.3.2, and check whether the mechanical condition of the thermometer is good. 6.4.2 Test on the influence of installation position
During the test, at room temperature, the thermometer is tilted 90° forward, backward, left and right from the normal working position specified by the manufacturer, and the changes in the thermometer indication caused by each tilt are visually observed and calculated. 6.5 Safety performance test
6.5.1 Insulation resistance test
The electric contact thermometer is tested under normal test atmospheric conditions and without power supply. Short-circuit the various terminals of the thermometer as specified, and then use a megohmmeter with a rated DC voltage of the value specified in Table 7 to measure the insulation resistance between the specified terminals in turn. The value of the insulation resistance should be read from the megohmmeter after the full test voltage is applied and the reading is stable. This test is only applicable to thermometers with output terminals insulated from ground. 6.5.2 Dielectric strength test
The electric contact thermometer is tested under normal test atmospheric conditions and without power supply. Short-circuit the various terminals of the thermometer as specified, and then set the no-load voltage of the test equipment to 50% of the test voltage specified in 5.3.2 and connect it between the relevant terminals of the thermometer. The power of the test equipment should be sufficient to make the set voltage drop by no more than 10% after the test thermometer is connected. During the test, the test voltage should be gradually and steadily increased from zero to the specified value and maintained for 1 minute, and observe and record whether there is breakdown or arcing. Then let the test voltage drop steadily to zero and cut off the power supply.
This test is only applicable to thermometers with output terminals insulated from the ground. 6.5.3 Explosion-proof performance test
The explosion-proof performance test of explosion-proof thermometers shall be carried out in accordance with the regulations of the explosion-proof safety supervision and inspection agency designated by the state. 6.5.4 Protection performance test
The shell protection test of the thermometer shall be carried out in accordance with the relevant provisions of GB4208. 6.5.5 Marine performance test
JB/T8803—1998
The marine performance test of marine thermometers shall be carried out in accordance with the regulations of the Ship Inspection Bureau of the People's Republic of China. 6.6 Appearance inspection
The appearance inspection of the thermometer shall be carried out by self-inspection method. Inspection rules
7.1 Factory inspection
Each thermometer shall be inspected by the quality inspection department of the manufacturer. It can only be shipped after passing the inspection and being accompanied by a product certificate. The factory inspection items of thermometers are shown in Table 10.
7.2 Type inspection
Inspection items
Basic error
Angle adjustment error
Set point error
Insulation resistance
Dielectric strength
See Table 11 for the type inspection items for thermometers.
Inspection Items
Basic Error
Angle Adjustment Error
Repeatability
Set Point Error
Switching Difference
Switching Repeatability
Thermal Stability
Time Constant
Long-term Operation Performance
Test Method Article Number
Indicating Thermometer
Electric Contact Thermometer
Test Method Article Number
Indicating Thermometer
Electric Contact Thermometer
Technical Requirements
Article Number
Technical Requirements||tt ||Article number
Inspection items
Influence of installation position
Insulation resistance
Insulation strength
Explosion-proof performance
Protective performance
Marine performance
Marking, packaging and storage
8.1 Marking
8.1.1 Dial marking
The dial of the thermometer should have the following markings: a) Manufacturer’s name or trademark;
b) Product name or model;
c) Symbol of measurement unit, ℃;
Accuracy grade:
e) Factory number or manufacturing date.
JB/T8803--1998
Table 11 (end)
Test method Article number
Indicating thermometer
Electric contact thermometer
Note: For dials with nominal diameters of 25mm and 40mm, item e) may not be marked on the dial. Electric contact thermometers should also add the following markings on the dial or appropriate positions: 8.1.2
Rated power of contacts;
Maximum working voltage (AC or DC) and maximum allowable current of contacts: b)
Ground terminal marking.
8.1.3 Explosion-proof marking
The explosion-proof marking of explosion-proof thermometers must comply with the regulations of the explosion-proof safety supervision and inspection agency designated by the state. 8.1.4 Protection marking
The shell protection marking of electric contact thermometers shall comply with the relevant provisions of GB4208. 8.1.5 Marine Marks
The marine marks of marine thermometers shall comply with the regulations of the Ship Inspection Bureau of the People's Republic of China. 8.1.6 Packaging Marks
The outer surface of the product packaging box shall have the marks specified in GB191 and GB6388 and other necessary marks. 8.2 Packaging
The packaging of thermometers shall comply with the provisions of GB/T15464. 8.3 Storage
Technical Requirements
Article Number
Thermometers shall be stored in a ventilated room with an ambient temperature of 5℃～40℃ and a relative humidity of no more than 85%, and shall not contain harmful impurities that may corrode the thermometers.1 Factory inspection
Each thermometer must be inspected by the quality inspection department of the manufacturer. Only after passing the inspection and attached with a product certificate can it be shipped out of the factory. The thermometer factory inspection items are shown in Table 10.
7.2 Type inspection
Inspection items
Basic error
Angle adjustment error
Set point error
Insulation resistance
Insulation strength
The thermometer type inspection items are shown in Table 11.
Inspection Items
Basic Error
Angle Adjustment Error
Repeatability
Set Point Error
Switching Difference
Switching Repeatability
Thermal Stability
Time Constant
Long-term Operation Performance
Test Method Article Number
Indicating Thermometer
Electric Contact Thermometer
Test Method Article Number
Indicating Thermometer
Electric Contact Thermometer
Technical Requirements
Article Number
Technical Requirements||tt ||Article number
Inspection items
Influence of installation position
Insulation resistance
Insulation strength
Explosion-proof performance
Protective performance
Marine performance
Marking, packaging and storage
8.1 Marking
8.1.1 Dial marking
The dial of the thermometer should have the following markings: a) Manufacturer’s name or trademark;
b) Product name or model;
c) Symbol of measurement unit, ℃;
Accuracy grade:
e) Factory number or manufacturing date.
JB/T8803--1998
Table 11 (end)
Test method Article number
Indicating thermometer
Electric contact thermometer
Note: For dials with nominal diameters of 25mm and 40mm, item e) may not be marked on the dial. Electric contact thermometers should also add the following markings on the dial or appropriate positions: 8.1.2
Rated power of contacts;
Maximum working voltage (AC or DC) and maximum allowable current of contacts: b)
Ground terminal marking.
8.1.3 Explosion-proof marking
The explosion-proof marking of explosion-proof thermometers must comply with the regulations of the explosion-proof safety supervision and inspection agency designated by the state. 8.1.4 Protection marking
The shell protection marking of electric contact thermometers shall comply with the relevant provisions of GB4208. 8.1.5 Marine Marks
The marine marks of marine thermometers shall comply with the regulations of the Ship Inspection Bureau of the People's Republic of China. 8.1.6 Packaging Marks
The outer surface of the product packaging box shall have the marks specified in GB191 and GB6388 and other necessary marks. 8.2 Packaging
The packaging of thermometers shall comply with the provisions of GB/T15464. 8.3 Storage
Technical Requirements
Article Number
Thermometers shall be stored in a ventilated room with an ambient temperature of 5℃～40℃ and a relative humidity of no more than 85%, and shall not contain harmful impurities that may corrode the thermometers.1 Factory inspection
Each thermometer must be inspected by the quality inspection department of the manufacturer. Only after passing the inspection and attached with a product certificate can it be shipped out of the factory. The thermometer factory inspection items are shown in Table 10.
7.2 Type inspection
Inspection items
Basic error
Angle adjustment error
Set point error
Insulation resistance
Insulation strength
The thermometer type inspection items are shown in Table 11.
Inspection Items
Basic Error
Angle Adjustment Error
Repeatability
Set Point Error
Switching Difference
Switching Repeatability
Thermal Stability
Time Constant
Long-term Operation Performance
Test Method Article Number
Indicating Thermometer
Electric Contact Thermometer
Test Method Article Number
Indicating Thermometer
Electric Contact Thermometer
Technical Requirements
Article Number
Technical Requirements||tt ||Article number
Inspection items
Influence of installation position
Insulation resistance
Insulation strength
Explosion-proof performance
Protective performance
Marine performance
Marking, packaging and storage
8.1 Marking
8.1.1 Dial marking
The dial of the thermometer should have the following markings: a) manufacturer’s name or trademark;
b) product name or model;
c) symbol of measurement unit, ℃;
Accuracy grade:
e) factory number or manufacturing date.
JB/T8803--1998
Table 11 (end)
Test method Article number
Indicating thermometer
Electric contact thermometer
Note: For dials with nominal diameters of 25mm and 40mm, item e) may not be marked on the dial. Electric contact thermometers should also add the following markings on the dial or appropriate positions: 8.1.2
Rated power of contacts;
Maximum working voltage (AC or DC) and maximum allowable current of contacts: b)
Ground terminal marking.
8.1.3 Explosion-proof marking
The explosion-proof marking of explosion-proof thermometers must comply with the regulations of the explosion-proof safety supervision and inspection agency designated by the state. 8.1.4 Protection marking
The protection marking of the outer shell of electric contact thermometers shall comply with the relevant provisions of GB4208. 8.1.5 Marine Marks
The marine marks of marine thermometers shall comply with the regulations of the Ship Inspection Bureau of the People's Republic of China. 8.1.6 Packaging Marks
The outer surface of the product packaging box shall have the marks specified in GB191 and GB6388 and other necessary marks. 8.2 Packaging
The packaging of the thermometer shall comply with the provisions of GB/T15464. 8.3 Storage
Technical Requirements
Article Number
The thermometer shall be stored in a ventilated room with an ambient temperature of 5℃～40℃ and a relative humidity of no more than 85%, and shall not contain harmful impurities that may corrode the thermometer.
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