Large-scale formaldehyde and TVOC emission detection climate chamber

Serial number

Project name

Technical indicators

1

Temperature

Adjustment range: (10～50)℃

Adjustment accuracy: ±0.5℃

Measurement accuracy: ±0.1℃

2

Relative humidity

Adjustment range: (30～70)%RH.

Adjustment accuracy: ±3%R.H.

Measurement accuracy: ±1%R.H.

3

Air replacement rate

Ventilation rate: 0.2～2 times/hour (stepless adjustable)

Regulation accuracy: ventilation rate ±1%

Measurement accuracy: ±0.01m³/h

4

Surface wind speed

Horizontal direction, full cross-section air circulation, air horizontal velocity is maintained at (0.1～0.3) m/s, accuracy ≤0.05m/s

5

Test cabin size (liner)

1-30m³(The exterior structure is set according to the actual site)

Using SUS304 mirror stainless steel plate for overall welding, the finish is grade III or above, and the surface is flat. The welds and surrounding areas are polished and free of deformation, all edges and corners are made of a certain arc, can be washed with water, no materials such as rubber and adhesives that interfere with the detection, sealing materials and other devices that come into contact with the air in the test chamber, Does not adsorb organic matter and formaldehyde. There should be no condensation or condensation in the test chamber.

6

In the test chamber relative to the external pressure

10±5Pa

7

Sealing

The air leakage per minute is less than 1% of the test chamber volume at a pressure of 1000PA. ;

The difference between the air inlet and outlet is not more than 2%;

8

Insulation box

The thickness of the polyurethane insulation board is 100mm, and the outer wall is made of steel plate, which is painted in white;

9

Test cabin background concentration and supply air concentration

TVOC≤50 μg/m³(formaldehyde background concentration ≤ 0.005ppm)

VOC≤5 μg/m³(TVOC background concentration ≤ 0.04ppm)

Formaldehyde ≤6 μg/m³(background concentration of single VOC ≤ 0.004ppm)

10

Measurement and control system

Real-time monitoring and recording of temperature, humidity, pressure, flow, replacement rate, time and other control parameters in the cabin. The touch control screen is used as the dialogue interface for personnel to operate the equipment, which is intuitive and convenient. Equipped with special control software, in addition to the function of touch screen, it also has remote control function, which can realize system control, program setting, dynamic data display and historical data playback, fault record, alarm setting and other functions. It can be monitored through the mobile APP.

11

Balance time

The test conditions of the test chamber reached equilibrium within 4 hours after the equipment was started

12

Recovery rate

More than 80% (in toluene or n-dodecane)

13

Air uniformity

The relative deviation of the concentration value of the reference standard between any two sampling points when the climate chamber is empty is ≤5%

14

Working hours

The continuous working time of the climate chamber is more than 30 days

15

Noise

The noise value of the climate chamber during normal operation is ≤70dB(A).

16

Insulation resistance

The insulation resistance of the live part of the climate chamber to the box shell is >1MΩ, and the box body is provided with a well-grounded and obvious sign.

17

Withstand voltage

When the terminal (including the lead wire) of the climate chamber heater and the control system are open-circuited, the withstand voltage strength test of the chamber shell with a voltage of 1500 V, AC 50Hz, and a duration of 1min, the insulation has no breakdown or flashover phenomenon.

18

Security protection system

1. High pressure protection and overcurrent protection of refrigeration system
2. Heater over temperature protection
3. Motor overcurrent protection
4. Water shortage protection
5. Air pump overheating, overcurrent, overpressure protection
6. Power phase loss, phase sequence protection
7. Power overcurrent and short circuit protection.