GB/T 11606-2007Methods of environmental test for analytical instruments (English PDF)

2.5 Selection of grouping of environmental conditions

2.5.1 For the product standards, it shall select the grouping of the environmental conditions in 2.2. If a certain influence quantity (generally only one) is not completely consistent with the environmental conditions of the specified group, it shall be specified separately in the product standard.

2.5.2 When it is not feasible to test the whole machine for a large product, the relevant standards shall provide for the test of those key parts or components.

2.5.3 The test items listed in Table 1 are the items that the instrument shall be subject to. In special circumstances, it shall be according to relevant standards OR negotiated by both the supplier and the buyer.

2.6 Test procedure Each test usually includes the following contents (except for special items):

a) Pretreatment (if necessary);

b) Initial testing (if necessary);

c) Condition test;

d) Intermediate testing (if necessary); Test the instrument according to relevant standards.

4.4.3 Condition test

4.4.3.1 Put the pre-processed instrument into the test box (chamber), at the normal position, in the non-powered and "ready-to-use" state. At this time, the temperature of the test box (chamber) is consistent with the temperature of the instrument.

4.4.3.2 The temperature of the test box (chamber) is reduced to the specified value, at a rate of change of not more than 1 °C/min (not more than the average value of 5 min). At this time, the instrument is powered on AND maintained for the specified test duration.

4.4.4 Intermediate testing After the duration of the test is reached, the performance test shall be carried out immediately, in accordance with the relevant standards.

4.4.5 Recovery After the testing, cut off the power supply of the instrument, to stop working. The temperature of the test box (chamber) is increased to the environmental conditions of the instrument during the pretreatment, at a rate of change of not more than 1 °C/min. After reaching the temperature, it will be restored for 1 h ~ 2 h.

4.4.6 Final testing Test the instrument according to relevant standards.

4.5 Information to be given by relevant standards When the relevant standards adopt this method, it shall give the following detailed rules as applicable as possible:

a) Pretreatment;

b) Initial testing items and requirements;

c) The duration of test;

d) Intermediate testing items and requirements;

e) Final testing items and requirements;

f) Any changes to the test procedure, as agreed by the supplier and the buyer. The duration of the instrument temperature test shall be selected from the following: 2 h, 4 h, 8 h, 16 h.

5.4 Test procedure

5.4.1 Pretreatment Place the instrument under normal (or reference) environmental conditions, to achieve temperature equilibrium.

5.4.2 Initial testing Test the instrument according to relevant standards.

5.4.3 Condition test

5.4.3.1 Put the pre-processed instrument into the test box (chamber), at the normal position, in the non-powered and "ready-to-use" state. At this time, the temperature of the test box (chamber) is consistent with the temperature of the instrument.

5.4.3.2 The temperature of the test box (chamber) is increased to the specified value, at a rate of change of not more than 1 °C/min (not more than the average value of 5 min). At this time, the instrument is powered on AND maintained for the specified test duration.

5.4.4 Intermediate testing After the duration of the test is reached, the performance test shall be carried out immediately, in accordance with the relevant standards.

5.4.5 Recovery After the testing, cut off the power supply of the instrument, to stop working. The temperature of the test box (chamber) is reduced to the environmental conditions of the instrument during the pretreatment, at a rate of change of not more than 1 °C/min. After reaching the temperature, it will be restored for 1 h ~ 2 h.

5.4.6 Final testing Test the instrument according to relevant standards.

5.5 Information to be given by relevant standards When the relevant standards adopt this method, it shall give the following temperature of each part of the inner wall of the test box (chamber) AND the specified test temperature, shall not exceed the following values: 3% at high temperature, 8% at low temperature (calculated by Kelvin (K) temperature). The instrument shall not be exposed to direct radiation, from any heating and cooling elements, that do not meet the above requirements.

6.3.1.4 The air in the test box (chamber) shall be fully circulated. Forced air circulation can be used, to keep the temperature uniform.

6.3.1.5 The volume of the test box (chamber) shall be greater than 3 times the volume of the instrument.

6.3.2 Requirements for the instrument When the working space of the test box (chamber) is not enough for the whole machine test, if the instrument allows, the test can be carried out separately, in the form of extension set.

6.3.3 Test duration The duration of the two temperatures of the instrument (t1) shall be selected from the following: 1 h, 2 h, 3 h.

6.4 Test procedure

6.4.1 Pretreatment Place the instrument under normal (or reference) environmental conditions, to achieve temperature equilibrium.

6.4.2 Initial testing Test the instrument according to relevant standards.

6.4.3 Condition test

6.4.3.1 Put the pretreated instrument into the test box (chamber), in the normal position. At this time, the temperature of the test box (chamber) is consistent with the temperature of the instrument.

6.4.3.2 Start the instrument. After normal operation, the temperature of the test box (chamber) is reduced to the specified value TA, at a rate of change of not more than 1 °C/min (not more than the average value of 5 min). After the temperature is stable, keep the test duration t1. Immediately test the instrument, at this temperature, in accordance with relevant standards.

7.3.1.7 The volume of the test box (chamber) shall be greater than 3 times the volume of the instrument.

7.3.2 Requirements for instrument When the working space of the test box (room) is not enough for the whole machine test, if the instrument allows, the test can be carried out separately, in the form of extension set.

7.3.3 Test duration The duration of the instrument test shall be selected from the following: 4 h, 8 h, 12 h.

7.4 Test procedure

7.4.1 Pretreatment Place the instrument under normal (or reference) environmental conditions, to achieve a temperature and humidity balance.

7.4.2 Initial testing Test the instrument according to relevant standards.

7.4.3 Condition test

7.4.3.1 Put the pre-processed instrument into the test box (chamber), in the normal position, under the non-powered and "ready-to-use" state. At this time, the temperature and humidity of the test box (chamber) are consistent with the temperature and humidity of the instrument.

7.4.3.2 The temperature of the test box (chamber) is increased to the specified value, at a rate of change of not more than 1 °C/min (not more than an average value of 5 min), to preheat the instrument. After the temperature is stable, humidify it, to reach to the specified value, within 2 h, to avoid condensation on the instrument. After the temperature and humidity are stable, keep the test duration.

Note: If the relevant standards stipulate that the instrument is energized when the condition test is started, then proceed as stipulated. Other methods remain unchanged.

7.4.4 Intermediate testing After the test duration is reached, start the instrument AND carry out testing, according to the relevant standards. The duration of the instrument test is 24 h per cycle. There are two test cycles.

8.4 Test procedure

8.4.1 Pretreatment Place the instrument under normal (or reference) environmental conditions, to achieve a temperature and humidity balance.

8.4.2 Initial testing Test the instrument according to relevant standards.

8.4.3 Condition test

8.4.3.1 Put the pre-processed instrument into the test box (chamber), in the normal position, under the non-powered, "ready-to-use" state.

8.4.3.2 Under the conditions of a temperature of 25 °C ± 3 °C and a relative humidity of 45% ~ 75%, make the test instrument's temperature be stable. After that, raise the humidity in the working space to not less than 95%, within 1 h.

8.4.3.3 According to the requirements of Figure 2, make the temperature in the working space change cyclically, within 24 hours.

a) Heating stage: within 3 h ±

0.5 h, increase the temperature is continuously increased to 40 °C (or 55 °C). Heating rate shall be limited to the shaded range in Figure 2. At this stage, except for the last 15 minutes, wherein the relative humidity shall not be less than 90%, the relative humidity of the rest of the time shall not be less than 95%, so that the test instrument will produce condensation (excessive condensation shall not be produced, for large-scale testing equipment);

b) High temperature and high humidity constant stage: Maintain the temperature of the working space within the range of 40 °C ± 2 °C (or 55 °C ± 2 °C). Count from the beginning of the heating phase, until reaching to 12 h ±

0.5 h. In this stage, except for the initial and last 15 min, wherein the relative humidity is not less than 99%, it is 93% ± 3% for the rest time;

c) Cooling stage: Reduce the temperature of the working space, from 40 °C ± 2 °C (or 55°C ± 2 °C) to 25 °C ± 3 °C, within 3 h ~ 6 h. The cooling rate shall be limited to the shaded range, which is specified in Figure 2. It shall be noted that, the cooling rate within

1.5 h after the beginning of the temperature reduction, is the temperature reduction rate, at which the temperature is reduced from 40 °C ± 2 °C (or 55 °C ± 2 °C) to 25 °C ± 3 °C, within 3 h ± 15 min. In this stage, except that the relative humidity It is performed according to product standards.

11.2.4 Test duration It is selected from the following time: 10 min, 2 h, 4 h. In the absence of requirements, the duration of the constant low pressure test is 2 h. The duration of the air pressure change test is 10 min.

11.3 Test procedure

11.3.1 Pretreatment Place the instrument under normal (or according to relevant standards) environmental conditions, to achieve temperature equilibrium.

11.3.2 Initial testing Test the instrument according to relevant standards.

11.3.3 Condition test

11.3.3.1 Put the pre-processed instrument into the test box (chamber), in the normal position, under the non-powered and "ready-to-use" state. At this time, the temperature of the test box (chamber) is consistent with the temperature of the instrument.

11.3.3.2 Reduce the air pressure of the test box (chamber) to the specified value. The average rate of pressure change shall not exceed 10 kPa/min. After the air pressure reaches the specified value, start the instrument AND maintain the specified test duration.

11.3.3.3 When the air pressure change test is performed, the instrument is started immediately after being placed in the test box (chamber). After the air pressure rises (falls) to the specified value, maintain the specified test duration, respectively. THEN, perform the test according to the relevant requirements.

11.3.4 Intermediate testing After the duration of the test is reached, the performance test shall be carried out immediately, in accordance with the relevant standards.

11.3.5 Recovery After the test is over, turn off the instrument and stop working. The average rate of pressure change of the test box (chamber) is restored to normal pressure, at no more than 10 kPa/min; the recovery time is 1 h ~ 2 h.

11.3.6 Final testing Test the instrument according to relevant standards.

11.4 Information to be given by relevant standards When the relevant standards adopt this method, it shall give the following detailed rules as applicable as possible:

a) Pretreatment;

b) Initial testing items and requirements;

c) The duration of the test;

d) Intermediate testing items and requirements;

e) Final testing items and requirements.

12.2.1 La: Test of dust resistance of enclosure

12.2.1.1 Purpose It is used to test the sealing performance of the instrument's enclosure.

12.2.1.2 Requirements for test box (chamber)

a) It can provide a non-laminar dust-carrying vertical circulating airflow;

b) It shall have the function of recycling dust;

c) It shall have good airtightness;

d) It shall be able to observe the circulation status of dust, during the test;

e) The inner wall shall be smooth and anti-static;

f) The volume of the test box (chamber) shall be more than 3 times the volume of the instrument.

12.2.1.3 Test dust Dry talc powder, that can pass through a square-hole sieve, which has an aperture of 75 µm and a wire diameter of 50 µm.

12.2.1.4 Dust concentration The dust concentration in the test box (chamber) (working chamber and pipe passage) is 2 kg/m3.

12.2.1.5 Air velocity It can ensure that the test dust settles on the test sample evenly and slowly, but the maximum value shall not exceed 2 m/s.

12.2.1.6 Temperature and relative humidity During the test, the temperature in the test box (chamber) is 15 °C ~ 35 °C; the relative humidity is 45% ~ 75%.

12.2.1.7 Duration The duration of the test is 8 h.

12.2.2 Lb: Test of free dust fall

12.2.2.1 Purpose It is used to test the ability of the instrument, in an environment where the dust settles freely AND there is no obvious air flow.

12.2.2.2 Requirements for test box (chamber)

a) It shall be possible to expose the instrument to dust-filled air, so that the dust can settle freely on the instrument;

b) It shall have the ability to blow in dust intermittently;

c) The dust used for testing shall be blown in, at one-fifth of the working height near the top of the test box (chamber);

d) It shall have good airtightness;

e) The inner wall shall be smooth and anti-static;