Path:
Home >
GB >
Page125 > GB 26851-2011
Home >
Standard_List >
GB >
Page125 > GB 26851-2011
US$399.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB 26851-2011: Audible and/or visual fire alarm signaling appliances
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 26851-2011 | English | 399 |
Add to Cart
|
3 days [Need to translate]
|
Audible and/or visual fire alarm signaling appliances
| Valid |
GB 26851-2011
|
PDF similar to GB 26851-2011
Basic data
| Standard ID | GB 26851-2011 (GB26851-2011) |
| Description (Translated English) | Audible and/or visual fire alarm signaling appliances |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | C81 |
| Classification of International Standard | 13.220.20 |
| Word Count Estimation | 17,175 |
| Date of Issue | 2011-07-29 |
| Date of Implementation | 2012-01-01 |
| Quoted Standard | GB 4208; GB/T 9969; GB 12978; GB 16838; GB/T 17626.2; GB/T 17626.3; GB/T 17626.4; GB/T 17626.5; GB/T 17626.6 |
| Regulation (derived from) | Announcement of Newly Approved National Standards No. 12 of 2011 |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This Chinese standard specifies the fire sound and/or light alarm classification, requirements, testing, inspection rules and signs. This standard applies to general industrial and civil buildings installation of fire sound and/or light alarm. Installed in other environments, with special fire performance sound and/or light alarms, except for special requirements otherwise provided by the relevant standards should also implement this standard. |
GB 26851-2011: Audible and/or visual fire alarm signaling appliances
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Audible and/or visual fire alarm signaling appliances
ICS 13.220.20
C81
National Standards of People's Republic of China
Fire sound and/or light alarms
Issued on. 2011-07-29
2012-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative references 1
3 Category 1
4 Requirements 1
5 Test 5
11 6 Inspection Rules
7 logo 11
Foreword
This standard is the first 4,6,7 are mandatory, the rest are recommended.
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The reference to the standard EN54-3.2001 "Fire detection and alarm systems - Part 3. Fire alarm sound."
Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents.
The standard proposed by the People's Republic of China Ministry of Public Security.
This standard by the National Standardization Technical Committee on Fire (SAC/TC113) centralized.
This standard is drafted by. Ministry of Public Security Shenyang Fire Research Institute.
Participated in the drafting of this standard. Xi'an System Sensor Electronics Co., Ltd., Hunan High City Fire Industrial Co., Ltd., Zhejiang Hang Chau Electronic Industrial
Limited.
The main drafters of this standard. Wang learned, Lin Qiang, Li Rui, Deng Lihong, Shao Yu, Zhao Yu, Guan Ming Yang, WU Li Long, Ding Hongjun.
This standard is the first release.
Fire sound and/or light alarms
1 Scope
This standard specifies the sound of fire and/or optical alarm classification, requirements, testing, inspection rules and signs.
This standard applies to general industrial and civil buildings to install fire sound and/or light alarm. Other installed in your environment, having
Special fire performance and sound/light or siren, except as otherwise provided by the special requirements of the relevant standards, should be the implementation of this standard.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB 4208 housing protection (IP Code)
GB/T 9969 General Instructions industrial products
GB 12978 fire electronic products inspection rules
GB 16838 fire electronic products environment test methods and severities
GB/T 17626.2 Electromagnetic compatibility Testing and measurement techniques - Electrostatic discharge immunity test
GB/T 17626.3 electromagnetic compatibility test and measurement technology RFEMS test
GB/T 17626.4 Electromagnetic compatibility Testing and measurement techniques - Electrical fast transient burst immunity test
GB/T 17626.5 electromagnetic compatibility test and measurement technology surge (impact) immunity test
GB/T 17626.6 Electromagnetic compatibility Testing and measurement techniques Immunity to conducted disturbances induced field
Category 3
3.1 use is divided into.
a) fire alarm sound;
b) light a fire alarm;
c) fire alarm sound and light;
d) gas release alarm.
3.2 divided by the use of premises.
a) Indoor type (including in-house use, the use of non-residential);
b) outdoor.
4 Requirements
4.1 Basic functional requirements
4.1.1 Fire alarm sound performance requirements
SPL 4.1.1.1 outdoor and indoor use of non-residential fire alarm sound and acoustic signals in at least one direction at 3m should
Not less than 75dB (A-weighted), and in any direction sound pressure level at 3m should not exceed 120dB (A-weighted).
4.1.1.2 provided with residential indoor fire alarm sound from the acoustic signal is issued to the stable should change from low to high side
Style running and began to issue from time to reach a stable should be 3s ~ 5s. The acoustic signal is issued in any direction at 3m
Great sound pressure level should not exceed 45dB (A-weighted), to the acoustic signal stabilized at least in one direction at a sound pressure level shall not be less than 3m
75dB (A-weighted), and in any direction sound pressure level at 3m should not exceed 120dB (A-weighted).
4.1.1.3 using tone of voice fire alarm tone period should be 0.2s ~ 5.0s.
4.1.1.4 having two kinds and two or more fire alarm sound different tones, the tone of each should be clearly different.
4.1.1.5 Fire alarm sound with voice alert function should be used to sound an alarm - 2 cycles - 1 cycle cycle Voice alarm tone
Repeated cycle alarm mode or a periodic alert tone -1 cycle -1 cycle voice alarm sounds.
4.1.1.6 more than just a fire alarm sound in the same direction, respectively, sound pressure level measured in the difference between the maximum and minimum values, or just the same fire
Disaster sirens sound in the same direction before and after the environmental test were measured sound pressure level of the difference between maximum and minimum values should be no more than 6dB.
4.1.2 Fire alarm light performance requirements
4.1.2.1 Fire alarm light flash frequency should be 1Hz ~ 2Hz.
4.1.2.2 Fire alarm light optical signal at 100lx ~ 500lx ambient light, 25m office should be visible.
4.1.2.3 issue fire signal light through the display in text form light fire alarms should be capable of both automatic and manual mode the display
Display clear and stable fire alarm signal light, and held until manually reset.
4.1.3 Fire alarm sound and light performance requirements
Fire alarm sound and light should also meet the requirements of 4.1.1 and 4.1.2.
4.1.4 gas release alarm performance requirements
4.1.4.1 gas release alarm should have the word marks, word marks shall be red luminous signs, the background should be white, text height should not
Less than 100mm.
4.1.4.2 using only red text information, the text background is not glowing gas release alarm minimum luminance surface of not less than
50cd/m2, should not exceed the maximum brightness 300cd/m2; red text messages, luminous white background gas release alarm text
Surface not less than the minimum brightness 5cd/m2, should not exceed the maximum brightness 300cd/m2, white background with red text itself and the maximum brightness
Minimum brightness ratio should not exceed 10, red white and brighter than the adjacent corresponding points on both sides of the border should not be less than 5 and not more than 15.
4.1.4.3 gas release alarm flashing frequency should be 1Hz ~ 2Hz, lighting and non-lighting time ratio should not be less than 3.2.
4.1.4.4 have sound alarm function of the gas release alarm should meet the requirements of 4.1.1.
4.2 operational reliability
Fire sound and/or light alarms should operate reliably within 4h, and meet the following requirements.
a) During the test, it should continue to send the alarm signal;
b) After the test, the basic function should meet the requirements of 4.1.
4.3 voltage fluctuation
Fire sound and/or light alarm should be specified by the manufacturer on the supply voltage, the lower limit value (if not specified, the upper and lower parameters are
Rated working voltage was kept at 110% and 85%) between a normal operating state, the basic functions should be consistent with the requirements of 4.1.
4.4 Insulation resistance
Fire sound and/or light siren insulation resistance value of the external charging terminals and the chassis between the insulation requirements should be not less than 20MΩ; fire
Sound and/or insulation resistance between power input terminal and cabinet light alarm shall be not less than 50MΩ.
4.5 Electric strength
Fire between acoustic and/or optical alarm external charging terminals and housing should be able to withstand a frequency of 50Hz, the effective value of 1250V AC
Lasted 1min voltage electric strength test, and meet the following requirements.
a) During the test, the breakdown should not occur;
b) After the test, the basic function should meet the requirements of 4.1.
4.6 Electromagnetic Compatibility
Fire sound and/or light alarm should be able to adapt to the test specified in Table 1 under the EMC conditions and meet the following requirements.
a) During the test, should maintain a normal monitoring state;
b) After the test, the basic function should meet the requirements of 4.1.
Note. The normal monitoring state refers to the sound of fire and/or optical alarm control and indicating equipment is connected and powered on, and did not issue a fire acoustic and/or optical warning signal or
Status fault signal.
Table 1 EMC test conditions
Name of test Test conditions
Electrostatic discharge
Immunity
test
Discharge voltage
kV
Air discharge (housing insulator). 8
Contact discharge (shell conductor). 6
Discharge polarity
Positive and negative
Discharge interval
≥1
The number of discharges per point
Working condition
Normal monitoring
status
Electrical Fast Transient
Burst Immunity
Test
Peak voltage kV
AC power cord. 2 × (1 ± 0.1)
Other cables. 1 × (1 ± 0.1)
KHz repetition rate
AC power cord. 2.5 × (1 ± 0.2)
Other cable. 5 × (1 ± 0.2)
polarity
Positive and negative
time
min
1 each
Working condition
Normal monitoring
status
Surge (impact)
Immunity Test
Surge (impact) voltage
kV
AC power cord - Line. 1 × (1 ± 0.1)
AC power cord - to. 2 × (1 ± 0.1)
Other cable lines - to. 1 × (1 ± 0.1)
polarity
Positive and negative
duration
ms
(100% decline)
Number of trials
AC power cord. 5
Other cables. 20
Working condition
Normal monitoring
status
Radio frequency electromagnetic fields
Radiated Immunity
test
Field strength
V/m
Frequency Range
MHz
80 to 1000
Scan rate
10oct/s
≤1.5 × 10-3
Modulation amplitude
80% (1kHz,
Sine)
Working condition
Normal monitoring
status
RF induction field
Conducted disturbances
Immunity Test
Frequency Range
MHz
0.15 to 80
Voltage
dBμV
Modulation amplitude
80% (1kHz, sine)
Working condition
Normal monitoring
status
4.7 Climate tolerance
4.7.1 Fire sound and/or light alarm should be able to withstand the test under live table 2 specified climate conditions, and meet the following requirements.
a) During the test, should maintain a normal monitoring state;
b) After the test, should be no damage to the coating and corrosion, the basic functions should be consistent with the requirements of 4.1.
Table 2 climate conditions (running test)
Name of test Test conditions
High temperature (running) test
temperature
55 ± 3 (indoor use)
70 ± 3 (outdoor use type)
duration
Working condition
Normal monitoring state
Low temperature (running) test
temperature
0 ± 3 (indoor use)
-40 ± 3 (outdoor use type)
duration
Working condition
Normal monitoring state
Damp (run) test
temperature
40 ± 2
Relative humidity
90 to 95
duration
Working condition
Normal monitoring state
4.7.2 Fire sound and/or light alarm should be able to withstand live table test under specified 3 climate conditions. After the test, no damage should be painted
Cover and corrosion, the basic functions should be consistent with the requirements of 4.1.
Table 3 Climatic environmental conditions (durability test)
Name of test Test conditions
SO2 corrosion (endurance) test
temperature
25 ± 2
Relative humidity
93 ± 3
SO2 concentration
10-6
25 ± 5
duration
twenty one
Working condition
No power
4.8 Mechanical environmental resistance
Fire sound and/or light alarm should be able to withstand the trials live table specified under 4 Mechanical environmental conditions, and meet the following requirements.
a) during the test (including post-impact test 2min), should maintain a normal monitoring state;
b) After the test, there should be no mechanical damage and tighten loose parts, basic functions should be consistent with the requirements of 4.1.
Table 4 Mechanical ambient conditions
Name of test Test conditions
Impact (running) test
Peak acceleration
m/s2
(100-20M) × 10
(Mass M≤4.75kg time)
Pulse duration
ms
Impact direction
6 (three mutually perpendicular
Each vertical axis
Directions)
Impact times
3 times in each direction
Working condition
Normal monitoring state
Vibration (sinusoidal)
(Running) test
Loop frequency range
Hz
10 to 150
Acceleration amplitude
m/s2
0.981
Sweep rate
oct/min
Each axis sweep
Frequency times
Vibration direction
X, Y, Z
Working condition
Normal monitoring state
4.9 enclosure class
Outdoor fire sound and/or enclosure class GB 4208 should meet the requirements specified in IP33 light alarm.
4.10 Instructions
Fire sound and/or light alarm should be a corresponding Chinese instructions. Instructions should meet GB/T 9969 requirements and with
Consistent product performance.
5 Test
5.1 General
5.1.1 test environment condition
The test shall be carried out under the following atmospheric conditions.
--- Temperature. 15 ℃ ~ 35 ℃;
--- Humidity. 25% RH ~ 75% RH;
--- Atmospheric pressure. 86kPa ~ 106kPa.
5.1.2 Sample status
During the test, if the requirements of the sample in a normal monitoring state, the sample should be connected with the control and indicating equipment and power.
5.1.3 Sample Installation
The test shall be the normal installation specified by the manufacturer to install. Instructions are given as a variety of installation, the test should be used in the sample
Installation work most unfavorable way.
5.1.4 Tolerance
Tolerance test data shall be ± 5%. Environmental conditions parameter deviation should be consistent with GB 16838 requirements.
5.1.5 Sample
The number of samples is 6, and be numbered before the test.
5.1.6 Check before test
5.1.6.1 Before the test, the sample is visual inspection, shall meet the following requirements.
a) No surface corrosion, coating loss and blistering, no scratches, cracks, burrs and other mechanical damage;
b) no loosening the fastening parts.
5.1.6.2 Press 4.10 requires inspection manual.
5.1.7 Test Procedure
Table 5 Test Procedure.
Table 5 test procedure
Sample No. No. reg pilot projects
5.2 Basic Functions 1 Test 1-6
2 5.3 Reliability Test 1
3 5.4 voltage fluctuation test 2
4 5.5 Insulation Resistance Test 2
5 5.6 Electric strength test 2
6 5.7 RFEMS Test 3
7 5.8 RF field immunity test conducted disturbances induced by 3
8 3 5.9 Electrostatic discharge immunity test
9 5.10 electrical fast transient burst immunity test 3
10 5.11 surge (impact) immunity test 3
11 5.12 temperature (operation) Test 4
12 5.13 low (running) test 4
13 5.14 Damp heat (run) Test 4
14 5.15 SO2 corrosion (endurance) test 5
15 5.16 Impact (run) Test 6
16 5.17 vibration (sinusoidal) (run) Test 6
17 5.18 enclosure class Test 2
Note 1. The test is only 5.6 more than the rated working voltage of 50V for the alarms.
Note 2. The specimen has only resistors, diodes and other electronic components without test 5.7 ~ 5.11.
Note 3. 5.18 outdoor siren test is only performed.
5.2 Basic function test
Basic functions 5.2.1 fire alarm sound test
In the free field, so that the fire alarm sound audible alarm signal. To install the sample point as the center and radius of 3m, horizontal
And the two semi-circular vertical plane to 30 ° intervals, and record the sound pressure levels were measured from each point of 15 ° to 165 °. For residential use
Indoor fire alarm sound, were measured and recorded the minimum and maximum sound pressure level and sound pressure level to rise by a minimum when the maximum sound pressure level
between. Using modulation of the fire alarm sound, measure and record the sound of the alarm cycle modulation signal. Having two kinds and two or more different tones
The sound of fire alarms, check each pitch different circumstances. For fire alarm sound alarm with voice features, check the alarm tone
Cycle alarm situation.
The basic function test 5.2.2 Light the fire alarm
5.2.2.1 so that the fire alarm light light warning signal is issued, the sample was measured and recorded the basic flash frequency. In the observation light from its 25m Police Department
Visibility reported signal.
5.2.2.2 for the use of monitors emit light a fire alarm signal light fire alarm, so that the fire alarm light in automatic mode, enter
Alarm signal, and then manually reset, observe display case; so that the fire alarm light in manual mode, manually start it send alarm
Light alarm signal, and then manually reset, observe display case.
Basic functions 5.2.3 fire alarm sound and light test
For fire alarm sound and light, 5.2.1 and 5.2.2 shall be tested requirements.
The basic function test 5.2.4 gas release alarm
Check the gas release alarm word mark, measure and record the sample surface brightness, frequency and flashing lights and non-lighting time ratio. have
Gas alarm sound alarm function of release 5.2.1 shall also be tested.
5.2.5 Additional function tests
For each type of fire sound and/or light alarms, check the use of the other features described in the specification.
5.3 Reliability Test
5.3.1 The sample audible and/or optical warning signal, holding 4h.
5.2 5.3.2 according to the method specified in the basic function test.
5.4 voltage fluctuation test
5.4.1 The upper limit of the supply voltage specified by the manufacturer (if not specified, the limit parameter is 110% rated voltage) to supply a sample,
5.2 according to the method specified in the basic function test.
5.4.2 lower supply voltage limit specified by the manufacturer (if not specified, the lower limit of the parameter is the rated working voltage of 85%) to supply a sample,
5.2 according to the method specified in the basic function test.
5.5 Insulation resistance test
5.5.1 Test procedure
By means of insulation resistance test were applied to 500V ± 50V DC voltage to the following section of the sample, continued 60s ± 5s after test
The amount of the insulation resistance values.
a) between the insulation requirements of the external charging terminals and housing;
b) For AC 220V power supply voltage sample, the power line input and the housing.
During the test, should ensure reliable contact with the insulation resistance between the leads should be large enough to ensure accurate readings.
5.5.2 Test Equipment
With insulation resistance test device satisfy the following technical requirements (also available or megger shake table test).
--- Test voltage. 500V ± 50V;
--- Measuring range. 0MΩ ~ 500MΩ;
--- Minimum scale. 0.1MΩ;
--- Chronograph. 60s ± 5s.
5.6 Electric strength test
5.6.1 Test procedure
5.6.1.1 By means test to 100V/s ~ 500V/s boost rate of the sample between the housing and the power cord is applied to 50Hz,
Test voltage of 1250V. Length 60s ± 5s, observe and record the phenomena that occur in the test.
5.6.1.2 In 100V/s ~ 500V/s rate to make a buck voltage drops below the rated working voltage, the voltage is turned off test device
Output.
5.6.1.3 5.2 according to the method specified in the basic function test.
5.6.2 Test Equipment
Using the test device satisfies the following condition.
--- Test voltage. voltage 0V ~ 1250V (RMS) continuously adjustable, the frequency of 50Hz, the short-circuit current of 10A (rms);
--- Liter, down rate. 100V/s ~ 500V/s;
--- Timing. 60s ± 5s.
5.7 RFEMS test
5.7.1 Test procedure
5.7.1.1 The sample according to the provisions of GB/T 17626.3 of the test arrangement, the power, the sample in the normal monitoring state 20min.
5.7.1.2 Test methods according to GB/T 17626.3 specified sample electromagnetic interference conditions shown in Table 1 is applied, observe and record the sample
status.
5.7.1.3 5.2 according to the method specified in the basic function test.
5.7.2 Test Equipment
Test equipment used in line with GB/T 17626.3 requirements.
5.8 RF field immunity test conducted disturbances induced
5.8.1 Test procedure
5.8.1.1 The samples according to GB/T 17626.6 specified test configuration, the power, the sample in the normal monitoring state 20min.
5.8.1.2 Test methods according to GB/T 17626.6 specified sample electromagnetic interference conditions shown in Table 1 is applied, observe and record the sample
status.
5.8.1.3 5.2 according to the method specified in the basic function test.
5.8.2 Test Equipment
Test equipment used in line with GB/T 17626.6 requirements.
5.9 Electrostatic discharge immunity test
5.9.1 Test procedure
5.9.1.1 The sample according to the provisions of GB/T 17626.2 of the test arrangement, the power, the sample in the normal monitoring state 20min.
5.9.1.2 Test methods according to GB/T 17626.2 specified sample plate and coupling conditions shown in Table 1 is applied to electromagnetic interference, observe and record
Sample record status.
5.9.1.3 5.2 according to the method specified in the basic function test.
5.9.2 Test Equipment
Test equipment used in line with GB/T 17626.2 requirements.
5.10 electrical fast transient burst immunity test
5.10.1 Test Procedure
5.10.1.1 The sample was conducted in accordance with GB/T 17626.4 test configuration, power on, it is in the normal monitoring state 20min.
5.10.1.2 Test method according to GB/T 17626.4 specified sample electromagnetic interference conditions shown in Table 1 is applied, observe and record the sample
status.
5.10.1.3 5.2 according to the method specified in the basic function test.
5.10.2 Test Equipment
Test equipment used in line with GB/T 17626.4 requirements.
5.11 Surge (impact) immunity test
5.11.1 Test Procedure
5.11.1.1 The sample was conducted in accordance with GB/T 17626.5 test configuration, power on, it is in the normal monitoring state 20min.
5.11.1.2 Test method according to GB/T 17626.5 specified sample electromagnetic interference conditions shown in Table 1 is applied, observe and record the sample
status.
5.11.1.3 5.2 according to the method specified in the basic function test.
5.11.2 Test Equipment
Test equipment used in line with GB/T 17626.5 requirements.
5.12 High Temperature (operation) test
5.12.1 Test Procedure
5.12.1.1 The sample was placed in the test chamber, the sample is in the normal monitoring state. Under normal atmospheric conditions to maintain 1h, then little
At 1 ℃/min heating rate will be raised to a temperature of 55 ℃ ± 3 ℃ (outdoor temperature alarms raised 70 ℃ ± 3 ℃), under conditions
Stable 16h, observe and record the state of the sample.
5.12.1.2 shutdown control and indicating equipment, not more than 1 ℃/min cooling rate cooling to ambient temperature, the sample was taken out in a normal large
Under aerobic conditions recover more than 1h.
5.12.1.3 5.2 according to the method specified in the basic function test.
5.12.2 Test Equipment
Using test equipment in line with the provisions of GB 16838.
5.13 low temperature (operation) test
5.13.1 Test Procedure
5.13.1.1 The sample was placed in the test chamber, the sample is in the normal monitoring state. Under normal atmospheric conditions to maintain 1h, then little
At 1 ℃/min cooling rate in the temperature dropped to -10 ℃ ± 3 ℃ (outdoor sirens temperature drops -25 ℃ ± 3 ℃), in this condition
Stable 16h, observe and record the state of the sample.
5.13.1.2 shutdown control and indicating equipment, not greater than 1 ℃/min heating rate is allowed to warm to ambient temperature, remove the sample, in normal large
Under aerobic conditions recover more than 1h.
5.13.1.3 5.2 according to the method specified in the basic function test.
5.13.2 Test Equipment
Using test equipment in line with the provisions of GB 16838.
5.14 Damp heat (run) test
5.14.1 Test Procedure
5.14.1.1 The sample was placed under normal atmospheric conditions after 2h ~ 4h heat into the chamber, the sample is in the normal monitoring state.
Regulating chamber, the temperature is 40 ℃ ± 2 ℃, the temperature is stable, then adjust the chamber relative humidity of 90% to 95%, holding 4d.
5.14.1.2 sample was taken out under normal atmospheric conditions resume 1h ~ 2h.
5.14.1.3 5.2 according to the method specified in the basic function test.
5.14.2 Test Equipment
Using test equipment in line with the provisions of GB 16838.
5.15 SO2 corrosion (endurance) test
5.15.1 Test Procedure
5.15.1.1 connected long enough to sample a non-tinned copper wire, to ensure that the environment can be directly after the corrosion test basic functions; corrosive environments
During the sample is not energized.
5.15.1.2 The sample was mounted on a temperature of 25 ℃ ± 2 ℃, SO2 concentration of (25 ± 5) × 10-6 (volume ratio), relative humidity
93% ± 3% of the chamber, continuous 21d.
After 5.15.1.3 corrosive environment, the sample was placed in a temperature of 40 ℃ ± 2 ℃, relative humidity less ...
Tips & Frequently Asked Questions:
Question 1: How long will the true-PDF of GB 26851-2011_English be delivered?
Answer: Upon your order, we will start to translate GB 26851-2011_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.
Question 2: Can I share the purchased PDF of GB 26851-2011_English with my colleagues?
Answer: Yes. The purchased PDF of GB 26851-2011_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.
Question 3: Does the price include tax/VAT?
Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs):
List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?
Answer: Yes. If you need your currency to be printed on the invoice, please write an email to
[email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.