According to the user’s demand, the equipment we provide will guarantee to meet the following technical parameters. And the user can use this constant climate chamber according to the following technical proposal.
Product Name： Constant Temperature And Humidity Test Chamber
Product Model： JS-TH-225-20
Application Notes About constant climate chamber
Application of Constant Temperature And Humidity Test Chamber:
This humidity temperature chamber is suitable for materials that need to be tested in different environments to get its reliability result.
The things you can test include:
- All kinds of automotive parts
- Electrical and electronic products
- Other products, parts and materials
In addition, the constant temperature and humidity chamber can also provide the following environmental simulations:
- High and low temperature constant
- Gradual change
- Sudden change
- Damp heat test
- Other environmental simulation
Restrictions on Test Items:
Flammable, explosive, corrosive, volatile substances, strong electromagnetic emission sources of testing and storage (except for special requirements)
Constant Temperature And Humidity Chamber Size
- Effective Volume: 225L
- Inner Box Size: W(Wide)600mm*H(High)750mm*D(Deep)500mm
- Outer Box Size: W(Wide)850mm*H(High)1850mm*D(Deep)1600mm
Structure and Materials of constant environmental chamber
|Integral type, square keel steel frame structure. The front upper part is the workshop, the lower part is the refrigeration unit, and the right side is the electric control cabinet.
|Equipment Outer Box
|Using 1.5mm thick cold tie plate double-sided electrostatic resin high-temperature spraying. (Spraying than the general paint spraying adsorption is stronger, durable)
|Equipment Inner Box
|All of the equipment inside the box uses the international standard thickness of 1.0MM SUS # 304 heat-resistant cold mirror stainless steel sealing welding。
|The thickness of the entire inner box insulation layer up to 100MM, using fire-resistant grade high-strength PU polyurethane insulation material + glass fiber overall foam. (More than the general PU heat break, fire resistance), insulation coefficient: less than 0.0212kcal/m∙hr.
|Single door design. The door and the box between the double layer use silicone rubber sealing strips: so high and low-temperature resistance, anti-aging, and good sealing performance. To prevent the door frame and the edge of the door from condensation or frost during the low-temperature test, the door frame and the edge of the door are set with an electrothermal defrosting device. With a vacuum observation window and an electrothermal (automatic adjustment) anti-frost and anti-condensation device.
|National standard 5mm thick angle iron +5mm thick 8*8 high quality channel steel. The inner liner can bear 200 KG uniform load.
|The door of the test chamber is equipped with a visual observation window. The window has an electric heating (automatic adjustment) anti-frost and anti-condensation device. Accordingly, you can observe the test sample’s test condition inside the chamber through the observation window at any time.
|Lighting Inside the Box
|The observation window is equipped with a total of 1 set of Philips 48W high brightness, moisture-proof and explosion-proof energy-saving lamps, which a manual direct switch can control.
|1 on the left side of the box, size φ50mm, with low thermal conductivity flexible insulating hole plug and hole cover (can be customized upon request)
|Door frame and insulation door docking sealing mouth using the original imported silicone seal, sealing performance is reliable and durable.
|Pressure Balancing Port
|Mechanical powerless type, maintenance-free. Correction opening pressure can be adjusted according to the actual demand to balance the pressure difference between inside and outside the box.
|Stainless steel sample shelf two layers, adjustable spacing, load-bearing ≥ 20kg.
|4pcs with 4 horizontally adjustable fixed foot cups and brakes
|Controller, over-temperature protector, time accumulator, emergency stop opening, start switch, communication port, etc.
Temperature and humidity air supply system
Electric heating tube Fins type nickel-chromium alloy anti-corrosion and explosion-proof electrode type heating tube with over-temperature protection.
Heating control method The controller output signal is controlled by SCR SCR relay to achieve high precision temperature control by controlling the current of the heater.
- Humidifying device
Humidification cylinder (boiler steam way) humidification, than the traditional surface humidification (water tray type) fast, high control accuracy, the box will not produce scale and other impurities pollution, low wet performance, and easy to clean. Humidification tube using all stainless steel seamless casing, insulation resistance greater than 50MΩ, and has a dry burn controller.
Humidification cylinder is made of stainless steel, and with the water level observation window.
- Water for humidification
Insulation resistance greater than 500Ωm pure water or tap water after purification treatment.
- Humidifying water tank
Equipment front drawer built-in 30L stainless steel water tank, the pump automatically replenishes water supply humidifier. Water level control adopts liquid level electronic float switch. Water tank with water level observation table and low water level line alarm device.
- Humidification control mode
Controller output signal through SSR solid state relay to achieve high precision non-contact switching control
By the refrigeration system freezing dehumidification (box air after lower than the dew point temperature evaporator, water precipitation). Choose with hydrophilic film processing evaporator fins, dehumidification performance is better. Because the hydrophilic film aluminum fins water tension is small, air condensation precipitation of water beads is very easy to slip off, not easy to produce in the fin gap obstruction of the water bridge. Thus greatly improving dehumidification efficiency!
- Air delivery method
Adopt the air conditioning box multi-channel airflow balance countersink pressure circulation air supply method. Effectively prevent moisture condensation, can better control temperature and humidity uniformity, reduce fan noise.
- Circulation motor
Circulate the airflow in the test chamber to achieve a higher uniformity of temperature and humidity.
- Centrifugal wind turbine
Multi-wing centrifugal circulation wind wheel, high and low-temperature resistant aluminum alloy blades.
- Airflow control method
The controller output signal adjusts the fan speed through frequency conversion control to achieve better, more accurate and stable control of the fluctuation and uniformity of temperature and humidity in the box.
U.S. imports of Europe and the United States plus PT100 high precision dry and wet bulb temperature and humidity sensor.
Temperature detection accuracy 0.01℃; Humidity detection accuracy: 0.1%RH.
Refrigeration system of constant temperature and humidity chamber
Mechanical vapor compressor unit: single refrigeration unit.
Fully Hermetic Compressor
U.S. DuPont fluorine-free environmental protection HFC R404A/R23 (ozone depletion index are 0 ).
Air-cooled high finned condenser.
Imported all-welded high-efficiency ST plate heat exchanger is used, not the traditional low-end half-welded or disassembled exchanger.
High-efficiency multi-sectional evaporator with hydrophilic membrane fins (fin-thickened type)
Evaporative Pressure Regulating Valve
Danfoss evaporating pressure regulating valve is a kind of regulating mechanism installed on the evaporator outlet pipe to prevent the evaporating pressure of refrigerant in the evaporator from falling below the set value (to ensure that the low temperature and high humidity conditions operate for a long time without frosting)
It is used to determine the quality and water content of the refrigerant in the system. The wide-angle sight glass allows visual inspection of the system refrigerant, so it is easy to see bubbles or flash gas in the system, indicating whether the refrigerant is properly dosed and needs to be charged. The indicator element in the center of the sight glass is highly sensitive to water and gradually changes color as the water content of the system changes.
System Design Process
- Pipeline welding
The use of a high-quality copper tube nitrogen protection welding method so that the internal smooth copper tube without oxidation, to avoid the traditional welding method, caused the inner wall of the copper tube oxide impurities into the refrigeration system damage the compressor.
- Vibration damping measures
Installation of vibration-damping springs and anti-vibration soft rubber pads combined with vibration damping at the bottom of the compressor.
Refrigeration system pipeline adopts the way of adding vibration-proof hose and C-type elbow to avoid the copper pipe and rupture caused by vibration and temperature change, resulting in refrigerant leakage and thus affecting the overall performance of the system.
- Noise Control
Adopt shell and tube water-cooled high-efficiency condenser, and add wave-type sound-absorbing sponge around the refrigeration unit to achieve lower noise effect.
Power Cord and Drainage Port
The power cord is located at the back of the unit, with a water catch pan and drainage hole installed underneath.
Control panel and circuit
|Using Taiwan’s imported brand industrial microcomputer controller, anti-integral saturation PID, BTC balanced temperature control mode (thermal compensation function) + DCC intelligent cooling control + DEC intelligent electrical control (temperature test alternating test program settings) software can be developed by DGB independently according to user needs.
|The controller’s acquisition module adopts the latest 24-bit AD conversion module. It realizes automatic calibration and higher control accuracy.
|New 7-inch TFT true color LED LCD touch screen (65535 true colors, resolution 800 * 480) automatic brightness adjustment, automatic lock screen function, smaller size, thinner, longer service life.
|2 groups of inputs, while supporting dry and wet bulb method and electronic humidity sensor, thermocouple T, K, E, etc. The device has an upper and lower temperature protection function.
|24-bit high precision, full range of high precision two decimal display.
|Temperature can be set in the range of -20℃~150℃, resolution 0.01℃;
|Humidity can be set in the range of 20%RH~98%RH, resolution 0.1%RH;
|Time setting range: 0~999999H. Resolution 0.1 sec.
|Program capacity: not less than 120 program groups can be set, the maximum number of individual program settings is 13450 segments, extra-long operation, 530 hours per segment, maximum 32000 cycles (overall cycle and segment cycle), the maximum fixed value 999999 hours, the program can be linked between
|Five operation modes: constant/ramp/program/constant/connected operation.
|Built-in recording program, memory ROM in the controller can store 24H operation for 350 days. Not affected by internal battery power failure and loss of data. It is convenient to automatically generate temperature and humidity curve files, data, operation records, alarm records, etc. It can express the set and actual values, cycle number, temperature section, temperature value, time, etc. In digital and graphical form and save them as BMP picture format files, which can be copied by USB or uploaded to the monitoring computer through connection.
|Support R232, LAN (network port), GPRS (cell phone) and other ways of communication, special network control software, convenient remote monitoring, and data acquisition. Up to 254 units can be connected, communication speed: 115,200bps max.(optional)
|Two sets of timing output control interfaces, with the setting of up to 65 kinds of output (built-in timer) mode and time control mode. So it can provide according to the program set requirements of the switch signal output, such as test products power on, power off, time settings, etc. The test power supply inside the box needs to be connected to a special power supply system.
|Sixteen groups of fault alarm output, Chinese and English, humanized promoting the cause of failure and troubleshooting methods.
|Regular Maintenance Messages
|Regularly pop up the list of routine maintenance and periodic maintenance items.
|With the program set in advance output on, refrigerant flow control function, control compressor delay, water shortage in advance, automatic light off and many other humane control, without the need for additional time relays.
|With power failure memory automatic reply function can be set to choose to continue to complete the set test or start a new test. Power failure time, the number of times will automatically generate a report record storage, convenient for staff investigation and evaluation.
|Multiple layers of password protection can be set to prevent unauthorized use and changes to internal parameters by non-operators.
Intelligent Control Functions
Intelligent control function: the central control system can intelligently identify the environmental conditions outside the test chamber (such as temperature, humidity), the test chamber test conditions (such as weight, heat capacity, work heat, etc.), the current temperature in the test chamber, to automatically open or close the corresponding work unit (such as the compressor or electric heating, cooling water, etc.), to achieve a variety of temperature, humidity, accurate control)
High-Temperature Section Balance
The central control system carries out amplification, analog/digital conversion and non-linear correction according to the collected temperature signal in the chamber. The system then compares it with the temperature set value (target value) and calculates the deviation signal through PID. Finally, the output adjustment signal automatically controls the output power of the heater to achieve a dynamic balance between heating and heat dissipation in the test chamber. This ultimately achieves constant temperature.
Refrigeration Pressure Monitoring
The test chamber has a pressure sensor for detecting the working condition of the compressor. It can detect the real-time dynamic pressure during the operation of the compressor. Combined with our special software and excellent working principle, we can ensure the compressor is always in good working condition. All these can greatly improve the reliability of the refrigeration system and extend the service life of its core components (such as compressor, solenoid valve, etc.). At the same time, it can also view the static pressure of the refrigeration system. So that professional engineers can use it to maintain equipment.
- With studio over-temperature protection.
- With no fuse protection switch, leakage/breakage, or grounding protection.
- Heater over-temperature, over-temperature, over-current protection.
- Compressor overload and overheat protection.
- Fan, motor overheat, overload protection.
- Compressor high and low pressure, overload protection.
- Humidification system water shortage overheats protection.
- System over-current, overload, short-circuit protection device.
- Power AC lightning protection, under-phase, over-voltage, and phase loss protection design.
- Operation manual maintenance manual, remote monitoring system computer loading software 1 set
- Test equipment location layout diagram 1 set
- And the company inspects and qualifies all pieces of equipment before delivery.
Conditions of use
The ideal ambient temperature for the use of constant temperature and humidity chamber is 5 to 30 degrees,
Power supply voltage
Atmospheric pressure is 80 kPa~106 kPa no strong vibration around.
Connection power 220V/380V AC (±10%), frequency: 50±2%Hz,
single-phase / three-phase, grounding resistance ≤ 4Ω; use 32A air switch
This environmental simulation chamber adopts air-cooled cooling method.
|Temperature and humidity controller
|Hardware import software independent research and development
|Over Temperature Protection
|Solid State Relays
|Temperature and humidity sensors
|American Omegas PT100
|Earth leakage switch
|Wire Protection Switches
|Wire and cable
|France Taikang/Li Ri
|Water pressure protection
- Free training of operators and maintenance personnel for customers (in our company or at the customer’s location).
- The whole machine warranty period: two years. Quarterly maintenance (quarterly in the province to the factory for regular maintenance, outside the province according to consultation)
- A complete maintenance service team provides the fastest and most professional maintenance services (1HR reply for repair reports, 24HR arrival at the factory, problem solving)
- After-sales service line:
FAQ About Constant Temperature And Humidity Chamber
1. Poor air circulation
Poor air circulation inside the test box will affect the distribution of moisture, resulting in uneven humidity. The test box has poor sealing, which causes poor air circulation and prevents humidity from rising. The moisture-proof plate, sealing strips, and elastic contact parts contribute to this issue.
2. Monitoring control system failure
The test box humidity setting is inaccurate, or humidity sensor failure, monitoring, control software failure, etc., may lead to the test box humidity not going up. This is because when the monitoring and control system fails, the humidity inside the test box can not be monitored and adjusted in a timely manner.
3. Removal of incomplete reasons
If there is dust, moisture, or other contaminants in the test box, it will affect air circulation. This situation can lead to uneven humidity, preventing humidity from increasing. To prevent this, clean the test box promptly to maintain a clean and dry internal environment.
4. Humidifier failure
Test box humidifier failure, or humidifier and control system mismatch, will also lead to the test box humidity does not go up. Humidifier failure refers to the humidifier sensor, sprayer, and other parts being damaged or aging, so you need to contact the supplier to overhaul or replace the humidifier.
5. The ambient temperature is too low.
The ambient temperature of the test chamber is too low, which will also affect the rise of humidity. When the temperature difference between the inside and outside of the test box is too large, it will lead to insufficient atmospheric humidity, thus affecting the rise in humidity. At this time, it is necessary to increase the temperature inside the test box to enhance the rate of rise in humidity.
The test chamber can test high temperatures up to 150 °C. If you need higher temperatures, customization is available upon request. This chamber is mainly used to assess how electronic products withstand high temperatures. Test the product’s aging in high-temperature environments to make sure it doesn’t change shape, become dry, or have other negative reactions.
It can also perform low-temperature tests, capable of reaching minus 70 °C. If you need lower temperature testing, please contact the editor for customization!
The programmable constant temperature and humidity test chamber can conduct humidity tests. It can simulate humid climates, with the standard humidity range between 20% and 98% RH.
Constant Temperature and Humidity Test:
This chamber can carry out constant temperature and humidity tests, including high-temperature/high-humidity and low-temperature/low-humidity scenarios. A common example is the Double 85 test, where the chamber is set to 85°C with 85% humidity conditions to assess the reliability of test samples.
Hot and Humid Test:
It can do hot and humid test (alternating hot and humid test, also known as the hot and humid test,) that is to simulate the harsh environmental climate of spring, summer, autumn and winter to test the product is resistant to complex and abnormal changes in the climate, if a long time in such an environment, the product needs to have sufficient resistance to alternating hot and humid capabilities.
This testing machine can also carry out temperature and humidity cycle test, high and low temperature cross-border test, low temperature and low humidity test, high temperature and high humidity test, high and low temperature cycle test, wet freezing test, thermal cycle test, temperature cycle, and other different test conditions.
- Compressor Water Ingestion Causes
When ice blockage occurs in the constant temperature and humidity test chamber, the technician suggests addressing the heating element’s susceptibility to blockage. This involves releasing fluorine, purging nitrogen-filled drying lines, and re-pumping fluorine. If ice blockages persist, it’s likely due to incomplete evacuation or excess fluorine-contaminated water. Notably, many of these failures stem from the compressor drawing in water.
- Chamber Sealing Problem:
Inadequate sealing of the constant temperature and humidity test chamber liner allows a significant amount of airborne water to penetrate the insulation layer. Leakage occurs during refrigerant leakage events. Prolonged operation without compressor shutdown results in negative pressure on the equipment’s low-pressure side, causing substantial water suction into the compressor through leakage points and leading to recurrent ice blockages.
Method 1: Carefully apply heat to the compressor and evaporator using an electric stove or light bulb. This facilitates the evaporation of water within the compressor and the system. Subsequently, use a vacuum pump to remove the water along with the air.
Method 2: Weld opens the high-pressure pipe and filters the drier. Allow the compressor to idle 2 to 3 times, utilizing the temperature rise of the compressor to evaporate and discharge water. Each idle session should be around four hours to prevent compressor damage.
It helps assess product quality and reliability and identifies manufacturing defects and weaknesses.
It shows the product decay and degradation process and helps predict its potential lifetime.
Evaluate the response of materials (including biological, industrial, and electronic) to selected conditions.
Constant temperature and humidity test chamber
This chamber is mainly used to test materials in different environmental conditions. It tests materials’ ability to withstand heat, cold, dryness and moisture. The chamber has a precise control system for temperature and humidity. It is used for industrial research, biotechnology testing, and creating simulated environmental conditions. This chamber is widely used in drug and food processing, as well as for aseptic tests, stability checks, and testing the performance, life, and quality of industrial products, raw materials, and plastic, metal, food, medical, aerospace, instrumentation, and vehicle products.
Drug stability test chamber
Pharmaceutical companies use it for testing drugs and new drugs. It includes accelerated tests, high-temperature tests, and bright light exposure tests. These tests assist pharmaceutical companies in selecting programs for testing drug stability. It measures the long-term temperature, humidity, and light conditions needed to evaluate drug failure.