Low concentration constant temperature and humidity system

1、 Recently, the Ministry of Environmental Protection of China released a new standard for measuring low concentrations of fixed pollution source exhaust gas: "Determination of Low Concentration Particulate Matter in Fixed Pollution Source Exhaust Gas by Weight Method" (HJ836-2017). The new standard will be officially implemented on March 1, 2018. At the same time, the Ministry of Environmental Protection of China has revised the "Determination of Particulate Matter and Sampling Methods for Gaseous Pollutants in Fixed Pollution Sources" (GB/T16157-1996), which will also be implemented together with HJ836-2017. The release of this new standard is bound to touch the hearts of millions of environmental testing personnel.

IIRequirements for the detection limit of the new standard
The detection limit of HJ836-2017 "Determination of Low Concentration Particulate Matter in Exhaust Gas from Fixed Pollution Sources by Weight Method": The modified content of "Determination of Particulate Matter in Fixed Pollution Sources and Sampling Methods for Gaseous Pollutants" (GB/T16157-1996): Add "1.2 When determining the concentration of particulate matter in exhaust gas from fixed pollution sources, if the concentration is less than or equal to 20mg/m3, it is applicable to HJ836 (Determination of Low Concentration Particulate Matter in Exhaust Gas from Fixed Pollution Sources by Weight Method), and the concentration is greater than 20mg/m3 and does not exceed 5When the concentration is 0mg/m3, the measurement result is stated as'<20mg/m3 '

IIICurrent pollution source emission standards

Overview of emission standards for fixed pollution sources in China

Therefore, only by obtaining both HJ836-2017 and GB/T16157-1996 testing qualifications can relevant testing institutions meet the monitoring requirements for industrial particulate matter emissions and environmental management needs, as well as the monitoring requirements for ultra-low emission environmental protection renovation of coal-fired power plants.

Introduction to Constant Temperature and Humidity System:

At present, ordinary constant temperature and humidity systems on the market can no longer meet the requirements of national standards. Ningbo Southeast Instrument Co., Ltd. has developed a low concentration weighing constant temperature and humidity equipment that meets the requirements of the new national standard HJ836-2017 according to the new standard requirements. Breaking the monopoly of foreign equipment in this area, making product prices more in line with market demand and easier to promote new standards.

Overview of Product Constant Temperature and Humidity System:

The DN-NVN-900S constant temperature and humidity system is designed to meet the new national standard HJ836-2017 of the Ministry of Environmental Protection, which specifies the low concentration of fixed pollution sourcesThe requirements for weighing conditions after sampling in the "Determination of Weight Method" stipulate that a high-precision balance should be placed in a constant temperature and humidity environment. The sample to be weighed should be placed in a constant temperature and humidity chamber and equilibrated for 24 hours before weighing. This product solves the problem of the influence of temperature and humidity changes in the laboratory environment on the weighing results of samples, greatly improving the accuracy of weighing sample results. This product is also used for weighing other samples with high requirements for symmetrical environments.

Main features of constant temperature and humidity system:

uThe temperature and humidity control accuracy is high, meeting the requirements of national standards HJ836-2017 and HJ656-2013. The temperature fluctuation is ± 0.2 ℃, and the humidity fluctuation is better than ± 2.0% RH. The instrument uses a Swiss Rotronic temperature and humidity transmitter, with a temperature deviation of ± 0.4 ℃ and a humidity deviation of ± 1.5% RH.

uThe system stability process is short, and the filtering process takes less than 30 minutes. After stabilization, weighing tests can be conducted at any time without waiting for the compressor to shut down like some products before weighing.

uThe human-machine interface adopts a 4-inch color touch screen, which is beautiful and durable, displaying temperature and humidity values truthfully (without fraud!), and can view temperature and humidity fluctuation curves separately through temperature and humidity curves, and view temperature and humidity historical data through table records.

uThe constant temperature and humidity box adopts a reasonable circulating air method, with soft wind and reasonable wind direction, which not only ensures uniform temperature and humidity inside the box, but also does not interfere with the weighing of the balance due to strong wind. Temperature uniformity± 0.4 ℃ (i.e. 0.8 ℃), humidity uniformity ± 1.5% RH (i.e. 3.0% RH).

uThe compressor unit and casing are transported as a whole/The split operation structure not only facilitates transportation and installation, but also effectively avoids the influence of compressor vibration on the weighing balance, overcoming the problem of shock resistance and noise reduction. This instrument saves 1/3 of the floor space compared to the proportional type.

uThe compressor adopts intermittent cooling mode, which saves 85% electricity compared to continuous cooling.

uThe heating and cooling systems are completely independent.

uStandard purified water circulation water supply method for humidification.

uSupply air circulation system: temperature resistant and low-noise air conditioning motor, multi blade axial flow fan.

uThere are two operation entrances on the box, which are isolated with latex gloves to avoid the influence of manual operation on constant temperature and humidity conditions.

uOverall equipment overheating, overload, and leakage protection, compressor overpressure protection, and low voltage protection.

uIn case of sudden situations such as leakage, sound and light alarms, automatic shutdown after alarm, and other protections.

uDifferent sample supports can be configured to weigh different samples.

uOptional imported high-precision 1/100000 electronic balance, color touch screen, Chinese operating system, dual range, fully automatic calibration.

Technical indicators of constant temperature and humidity system:

＊Constant temperature and humidity systemexplain:

uThe above parameters fully comply with the requirements of relevant national standards. Due to product upgrades or discrepancies between pictures and actual machines, please refer to the actual machine. This content is for reference only.