BOZHEN NBC-960L programmable Humidity Chamber constant temperature and Humidity Test Chamber -20~100 ℃/960L

Implementation standards

GB/T2423.1-2008 Test A Low temperature test method GB/T10592-2008

GB/T2423.2-2008 Test B High Temperature Test Method GB10586-89 Technical Conditions of Humid Heat Test Chamber

GB/T2423.3-2008 Test Ca Constant damp heat test method GJB150.3 High temperature test method

GB/T2423.4-2008 Test Db Alternating damp heat test method GJB150.4 Low temperature test method

GB2423.22-2002 Test Na Temperature change test method GJB150.9 Damp heat test method

GB2423.34-2005 Test Z/AD Temperature and humidity combined cycle test method

structural design

1. Inner and outer box materials: stainless steel plate (SUS#304), outer box powder paint;

2. Outer box light source: safe, high-brightness, energy-saving lighting;

3. Observation window: five layers of tempered glass (used for observing test specimens);

4. Window anti-sweat design: adopts electric heater device to prevent moisture condensation (50W);

5. Test hole: can be used for external test power cord and signal (50mm one);

6. Insulation layer: Thermal insulation layer is flame-resistant and fire-resistant PU + insulating glass wool (insulation layer thickness 100mm);

7. Box door: adopts double-channel heat insulation and air-tight sealing to effectively isolate external temperature leakage;

8. The rack in the box: the grid rack and two stainless steel strip grids can be movable and adjusted (each grid of the rack is 5.0cm);

9. Low noise design: double-layer shockproof refrigerated chassis, effectively reducing the noise of the equipment to less than 65 decibels (patented);

10. Chassis anti-leakage design: self-evaporating waterproof chassis, effectively preventing condensation water from flowing out;

11. Water and electricity separation design: Separation design of water system and circuit system improves the safety of the equipment.

Temperature and humidity electric heating circulation system

1. Electric heating circulation system: humidity adopts special moisture-proof and heat dissipation design, stainless steel extended axis circulation motor

2. Circulation fan: high/low temperature resistant aluminum alloy multi-wing circulation fan

3. Wind deflector design: Adjustable wind deflector design effectively improves the uniformity of temperature and humidity distribution.

4. Temperature control method: balanced temperature regulation PID+PLC+A.D+SSR

5. Humidity control method: balanced humidity control PID+PLC+A.D+SSR

Humidity make-up water system

1. Water supply device: hidden water storage tank.

2. Water recycling system: switch between automatic recycling and non-recycling, which can be selected according to needs (the specification defines non-recycling)

3. Humidity and water level sensor: DC optical coupling detection and AC electromagnetic automatic water level control.

4. Humidity generator structure: glass observation structure, which can clearly observe the water level and internal water quality.

5. Humidity water cup: High-strength anti-cracking water cup, which effectively prevents the water cup from cracking when the waterway not properly maintained.

6. Water tank quick plug-in design: The Water Tank connector adopts a quick connector , which makes it easy to take out the Water Tank, add water, clean, etc.

7. Humidity humidifier: stainless steel armored humidifier

8. Internal and external balance pressure design: The pressure balance design of the inner box and water system prevents the water in the water cup from being sucked into the inner box due to rapid cooling.

9. Waterway filtration system: Install waterway filtration and cleaning device

cooling device

1. Refrigeration device: European and American effective ultra-low temperature refrigeration compressor unit. (Air-cooled refrigeration French Taikang brand compressor, power 3P per unit)

2. Effective components: The condenser and evaporator adopt AC&R double spoiler type aluminum fin devices.

3. Condenser: air-cooled condenser

4. Energy-saving design: Intelligent expansion valve system automatically adjusts the refrigerant flow rate according to the load.

5. Door wall moisture-proof design: adopts compressor high-pressure and high-temperature pipelines, sweat-proof and moisture-proof treatment.

6. Low humidity design: The refrigeration system is specially designed, and the standard model can achieve 60-80℃ and 10% humidity.

7. Refrigeration method: single-stage compression refrigeration (French Taikang compressor)

8. Refrigerant: Use HFC type non-azeotropic environmentally friendly refrigerant R404A environmentally friendly refrigerant, which does not destroy ozone at all and has no toxic side effects.

9. Standard modular design: Interoperable components provide high compatibility and quality stability.

10. Refrigeration principle:

Refrigeration methods are divided into vapor compression refrigeration, absorption refrigeration, vapor injection refrigeration, gas expansion refrigeration, and thermoelectric refrigeration. Among the above refrigeration methods, vapor compression refrigeration is the most economical and widely used refrigeration method. It is also a refrigeration method commonly used in environmental testing equipment. Its principle is to use the latent heat of evaporation of liquids such as Freon to absorb heat from the object being cooled. Refrigeration. (Single-stage refrigeration cycle diagram) is a schematic diagram of the vapor compression refrigeration cycle process. The liquid entering the evaporator is throttled by the expansion valve and evaporates by absorbing the latent heat of evaporation from the surrounding objects. After evaporation, it turns into low-temperature and low-pressure gas and is sucked into the refrigeration compressor. After being compressed by the compressor, it turns into high-temperature and high-pressure gas and enters water-cooling or air-cooling for condensation. The evaporator is cooled into a high-pressure liquid, and then enters the evaporator through the expansion valve. In this reciprocating cycle, heat is absorbed from the low temperature to achieve cooling, and then the heat is released from the high temperature.

Single stage refrigeration cycle diagram

In the refrigeration cycle shown in (single-stage refrigeration cycle diagram), a change from one state to another is called a process. There are four processes in the refrigeration cycle. The four processes in the refrigeration cycle are briefly described below.

(1) Evaporation process: After passing through the expansion throttling, the low-pressure wet steam absorbs heat from the surrounding medium in the evaporator and is cooled, and gradually increases its dryness. In this way, the gas coming out of the evaporator has become dry saturated steam or slightly superheated steam. During the evaporation process, the refrigerant temperature and pressure remain constant.

(2) Compression process: After completing the refrigeration effect, the vapor from the evaporator enters the refrigerator. After compression, the temperature and pressure increase sharply. Therefore, the gas discharged from the refrigerator becomes hot steam with a high degree of superheat. During the compression process, the entropy value of the refrigerant remains unchanged.

(3) Condensation process: The high-temperature and high-pressure superheated steam discharged from the refrigerator enters the condenser and undergoes heat exchange with cooling water or air, causing the superheated steam to gradually turn into saturated steam and then into a saturated liquid. When cooling with cooling water, the temperature of the saturated liquid will continue to decrease and subcooling will occur. The pressure remains constant during condensation.

(4) Throttling process: The liquid coming out of the condenser is throttled through a throttling device such as an expansion valve or capillary tube, and becomes low-temperature and low-pressure wet steam. The refrigerant enthalpy value remains unchanged during the throttling process.

The above four cycle processes are continuously circulated in order to achieve the purpose of refrigeration.

In order to complete each thermodynamic process of the refrigeration cycle, the compressor, heat exchanger, pipelines, pipeline accessories, etc. need to be composed into a system, which is called a refrigeration system.

Single-stage compression refrigeration means that the refrigerant vapor is compressed only once, and its lowest evaporation temperature can be controlled at -30c ~ -40c. When a lower test temperature is required, a cascade refrigeration system is usually used, that is, two Single-stage compression refrigeration systems are cascaded together. One of the systems is the high-temperature part and uses medium-temperature refrigerant; the other system is the low-temperature part and uses low-temperature refrigerant. The evaporator in the high-temperature part and the condenser in the low-temperature part are stacked to form a condensing evaporator.

Control System

Controller combination

A.7-inch TFT true color VGA (800x480) Korea Sanyuan original imported TEMI1500 controller

B. Touch screen with remote measurement, monitoring and control.

C. Built-in large storage space, 24 hours of continuous power on

Can save 3 months of digital data (sampling is 1M) - can replace computer storage, display and save PV and SV curves (0~90 days)

D. Use PT100 platinum resistance sensor

E. When alarming, a prompt function will pop up. And the alarm information can be stored in the touch screen and can be recalled at any time for analysis.

F. Forced output, electronic nameplate, daily maintenance, precautions, output monitoring, input monitoring, notepad and many other user-friendly functions.

Main functions of the controller

A. Temperature/humidity analysis capability 0.01℃/0.1%RH.

B. Temperature/humidity control accuracy ±0.2℃/±2%RH.

C. Set time capacity 0H1M～9999H59M.

D. Program memory function: 100 groups and 6000 segments.

E. Display language Chinese and English

F. Schedule the power-on time and schedule the time setting function.

G. Fault medical record software device design, machine maintenance, real-time control of storage/recording/analysis

H. Controller deviation setting intelligent digital temperature and humidity value deviation "return to zero"

I. After power resumption, select the .

J. Temperature protection upper and lower limit settings When the test program is stored, the upper and lower temperature protection

K. The protection device controller automatically monitors the safety protection system and preventive fault detection control interface

L. Power failure memory device ensures that pre-stored programs retain memory data during a power failure.

M. Capability range fool-proof design exceeds the set machine control capability range, and a notification message will pop up in real time

N. Security authority setting Machine operation authority setting

O. Mode selection: fixed-point or programmable control mode

P. Communication format supports RS232/RS485

I. Equipped with screen protector

S. Communication format supports USB curve reading and data downloading

Security protection system

1. Leakage/surge prevention protection Leakage circuit breaker leakage protection FUSE.RC electronic surge prevention protection.

2. The controller prevents the power supply from lightning strikes. The primary side of the AC power supply of the controller is equipped with a lightning arrester ZRN device.

3. Automatic self-detection and protection device inside the controller A. Detection of data transmitted between microcomputers

B. Temperature/humidity sensor (Sensor) is open or short-circuited (+-OVER)

C. The first layer of high/low temperature over-temperature protection operation controls the high temperature and low temperature over-temperature protection settings.

4. Fault detection control interface—external fault automatic detection and protection device

A. The third layer of high temperature and over-temperature protection high temperature and over-temperature protection device

B. The second layer of high-temperature and over-temperature protection electronic high-temperature and over-temperature protection device

C. Water cutoff and air burning protection Humidity water cutoff protection and electric heating water cutoff and air burning protection

D. Compressor protection refrigerant pressure protection device.

E. Water tank water shortage protection Automatic alarm when the water level in the Water Tank is too low

F. Compressor overcurrent protection

5. Fault abnormality protection: When a fault abnormality occurs, the control power supply and fault cause indication and alarm output signals are cut off.

6. Dynamic high-low temperature protection dynamically adjusts the high-low temperature protection values ​​according to the set conditions.

Professional production technology

1. Modular or standardized production of each component.

2. The refrigeration system is supplied with nitrogen for welding, and the HPS precision digital instrument is supplied with nitrogen for pressurization testing.

3. Vacuum test of Japanese-made ULVAC Vacuum Pump and American-made HPS precision vacuum digital instrument.

4. Microcomputer controller. Recorder calibration equipment Agilent34970A.

5. Temperature electrothermal control power efficiency test and insulation resistance test 50 M Ohm/500DCV or above.

Test chamber X1, shelf/bracket X2, test hole plug X1, manual X1, certificate X1, warranty card X1

[Note] Because the manufacturer's packaging may be updated or upgraded, the detailed packaging list shall be subject to the latest standard configuration of the manufacturer.