Constant temperature and humidity test chamber (Figure 1)

1. Product introduction: Main functions and advantages of the equipment:

1.1 Product Overview

The constant temperature and humidity test chamber can be used to determine the adaptability of electronic products, components, materials, etc. to use and store under High humidity, low humidity, constant humidity, temperature cycling changes, and humidity conditions where condensation occurs on the surface.

The constant temperature and humidity test chamber adopts a relatively reasonable structure and stable and reliable control method, making it aesthetically pleasing, easy to operate, safe, and with high humidity control accuracy. It is an ideal equipment for conducting low humidity tests, constant temperature and humidity tests, and alternating humidity tests.

1.2 Product Advantages and Technical Features

1.2.1 Utilize a multi-channel, environmentally friendly and energy-saving (low-noise) mechanical compression refrigeration system.

All materials, parts, components, raw materials, etc. of the device, whether domestically produced or imported, are made of environmentally friendly products; Based on the characteristics of mechanical compression refrigeration, a two-stage multi-channel main and bypass system is adopted. The multi-channel main and bypass can be adaptively selected and activated according to different working conditions. The entire control is automatically implemented by an intelligent control system according to the working conditions, changing the traditional way of using a temperature controller to control the heater to offset the cooling capacity to control the cooling capacity. So as to achieve energy-saving effect, not only does the energy consumption account for only 80% of similar products. It also reduces the operating load of the refrigeration compressor, reduces equipment vibration and noise, and improves control accuracy. To achieve better energy-saving effects, frequency conversion technology is adopted to adapt the refrigeration output of the refrigeration compressor to various temperature change rate requirements in the laboratory, while controlling the power loss during use to achieve energy-saving effects. Use sound-absorbing and silencing methods in different parts of the entire structure and mechanical working process to reduce the overall noise of the equipment.

1.2.2. Independently developed multi-channel and multi-stage throttling system (refrigeration system).

The refrigeration system of the constant temperature and humidity test chamber is designed with different capillary main and bypass paths according to different operating conditions. The capillary throttling system is automatically controlled and adjusted by the intelligent communication control system based on the operating conditions to ensure that the flow rate can be adjusted, achieving the purpose of temperature change. Moreover, the temperature field changes uniformly and the temperature fluctuation is minimal.

1.2.3. Apply a broadband compression balance temperature control system to achieve rapid temperature control through a fast convergence PID adaptive algorithm.

By using a temperature mixing chamber, a static pressure chamber, and a forced air duct system with centrifugal blades, sufficient exchange of cold and heat is ensured, and air is evenly supplied through the top orifice plate to each space in the working room (experimental area) to achieve temperature uniformity; To achieve rapid temperature convergence, our company has collaborated with Sanyuan Corporation in South Korea to develop a dedicated PID adaptive algorithm suitable for our company. This control method continuously adjusts the control according to the temperature situation during the control process, achieving the control objectives of fast sword retraction, small temperature overshoot, and high stability.

1.2.4 Implement remote visual control.

The constant temperature and humidity test chamber is equipped with a human-machine management interface and a touch mode automation control system to achieve automatic control; Simultaneously, connect to remote computers through RS485 communication interface to achieve network management and remote monitoring. The entire system is controlled and managed through a graphical interface, which is simple and fast, with automatic fault prompts. The graphical prompts are energy-saving and provide solutions to guide users in quickly troubleshooting.

Main functions of the device:

The constant temperature and humidity test chamber is suitable for testing various performance indicators of aerospace products, information electronic instruments and meters, materials, electricians, vehicles, metals, electronic products, and various electronic components in high and low temperature or humid and hot environments For the purpose of quality management

Performance indicators and system composition of programmable constant temperature and humidity experimental machine

Model GC-HH-1000G

The sample restriction constant temperature and humidity test chamber prohibits the testing of flammable, explosive, and volatile substance samples; Testing for storing samples of corrosive substances, testing for storing organisms, testing and storing samples of strong electromagnetic emission sources

Volume, weight, and size

Nominal internal volume 1000 L

The effective size of the inner box is 1000 × 1000 × 1000 (mm) W × H × D

Exterior space approximately 1500 × 1870 × 1500 (mm) W × H × D

Weight approximately 500kg

Power, current, and power supply

The maximum power is about 13KW

The maximum current is about 22A

Power supply conditions

And power supply

AC380V three-phase four wire system+protective grounding N; The allowable voltage fluctuation range is 10%;

The allowable frequency fluctuation range is 50 ± 0.5HZ; TN-S power supply or TT power supply

The grounding resistance of the protective grounding wire is less than 4 Ω

Require users to configure corresponding capacity air or power switches for the equipment at the installation site, and this switch must be independently controlled. When placing powered samples in the equipment use box, please use an external power source for the sample power supply and do not directly use the local power supply;

performance index 

The values measured under the environmental conditions of+25 ℃, relative humidity ≤ 85%, and no sample in the test chamber.

Temperature and humidity range Temperature range:- 70～+150℃

Humidity range: 20-98% RH (as shown in the figure)

Control accuracy Temperature resolution: 0.01 ℃ Humidity resolution: 0.1% RH

Temperature deviation: ± 1.5 ℃ Humidity deviation: ±2%RH

Temperature uniformity: ≤ 2 ℃ Humidity uniformity: ≤ 3%RH

Temperature fluctuation: ± 0.5 ℃ Humidity fluctuation: ± 2% RH

Heating and cooling rate+25 ℃ →+150 ℃ ≤ 35 min+25 ℃ → -70 ℃ ≤ 80 min

Note: The heat capacity of steel shall not exceed 35kg/m3 per cubic meter of load, and there shall be no active heat load during the wet heat test

Note: The above performance indicators are measured under the conditions of an ambient temperature of+25 ℃, relative humidity ≤ 85%, and no sample.

Execution standards and testing meet condition 1 GB/T2423.22-2002 Test N Temperature Change Test Method

2. GB/T2423.3-93 (IEC68-2-3) Test Ca: Constant Damp Heat Test Method

3. GB/T2423.4-93 (IEC68-2-30) Test Db: Alternating Damp Heat Test Method

4. GJB150.3-86 High temperature test method

5. GJB150.4-86 Low temperature test method

6. GJB150.9-93 Damp Heat Test Method

7 GB2423.1-2008/IEC6008-2-1-2007 Environmental testing for electrical and electronic products Part 2: Test methods Test A: Low temperature

8. GB/T 2423.2-2008 Environmental Testing for Electric and Electronic Products - Part 2: Test Methods - Test B: High Temperature

9 G/BT 2423.4-2008/IEC6008-2-30: 2005 Alternating Damp Heat Method

10. GB/T5170.18-2005 Basic parameter calibration method for environmental testing equipment for electrical and electronic products Temperature/humidity combined cycle testing equipment

11. GB/T10586-2006 Technical Conditions for Damp Heat Test Chamber

12. GB/T 10589-2008 Technical Conditions for Low Temperature Test Chamber

Testing laboratory for whole machine: The factory has a constant temperature testing laboratory for whole machines, and the box is tested at different ambient temperatures.

structure characteristics

Box structure, inner box material: 304 # stainless steel, 1.2mm thick

Outer box material: 304 # stainless steel 1.0mm thick or (cold-rolled steel plate 1.2mm thick baked paint treatment, optional)

Insulation material: Polyurethane foam adhesive 100mm thick

The control box and test box are integrated

The air conditioning channel is equipped with an air chamber, a circulating air duct and a stainless steel circulating fan. Through the top back leaf window and a diffuser, the air is blown out evenly from the top, and the temperature and humidity in the mixing room are distributed to the test space, so as to achieve the goal of evenly controlling the temperature and humidity

Box door

Single door opening

Explosion proof handle

Anti condensation electric heating device

Vacuum automatic defogging transparent window

Window lighting fixture

Lead test hole with a diameter of 50mm, which can be opened on both sides, and equipped with corresponding insulation accessories and special sealing soft plugs

Observation window 1, there is one piece on the laboratory door; Window viewing range: W300 * H450mm conductive film explosion-proof, anti fog, anti frost tempered glass observation window

2. Simultaneously equipped with conductive film explosion-proof, anti fog, and anti frost tempered glass observation windows, specially customized.

TEMI880 LCD touch programmable controller for control panel

Lighting switch, main power switch, RS-232 communication interface

Mechanical room refrigeration unit, exhaust fan, drainage device, adjustable back blade window, steam outlet

The test material rack is made of 304 # stainless steel punched and bent into a mesh shape, which is easy to use. The spacing between material racks can be adjusted, and two pieces are standard configuration

Distribution control cabinet main power circuit breaker, controller, distribution board, cooling fan, over temperature protector

The heating system adopts a scale heat dissipation heating tube P.I.D to control heating and achieve temperature balance

The humidification and dehumidification system adopts an external humidification method, where the compressor starts dehumidification and the P.I.D controls the humidification amount to achieve the required humidity

Self made PVC enlarged water tank for water replenishment system, water pump for automatic water supply, circulating filtration and recycling

refrigeration system

Refrigeration principle

In order to ensure the cooling rate and minimum temperature requirements of the laboratory, a binary duplex refrigeration system is used in this laboratory. The duplex system includes a high-temperature refrigeration cycle and a low-temperature refrigeration cycle, and heat exchange is achieved through an evaporative condenser

The refrigeration compressor adopts the European imported French Taikang fully enclosed compressor

Cooling method: air-cooled scale condenser, circulating fan for heat dissipation

Evaporator finned tube heat exchanger

The evaporative condenser adopts a high-temperature copper brazed layout heat exchanger, which has a small surface area, low energy loss, and high heat transfer efficiency

Throttle device, thermal expansion valve, capillary tube

Fully imported refrigeration accessories

The oil separator separates the frozen oil droplets mixed with the high-temperature and high-pressure refrigerant gas discharged from the compressor, and returns them to the compressor's curved track chamber for lubrication and cooling purposes

The dry filter absorbs residual moisture and acidic substances in the refrigerant of the refrigeration system, and filters out solid impurities, copper chips, etc. in the system, protecting the normal operation of the expansion valve and capillary tube from ice blockage and dirty blockage

Environmentally friendly refrigerants R404A/R23 are used as the refrigerant for this refrigeration system

electric control system 

Controller, controls temperature and humidity separately

LCD Touchscreen Controller TEMI880

Program capacity and available program quantity for control functions: up to 120 groups, one program can be combined from 1 to 99 segments

Usable memory capacity: 1200 segments, can execute commands repeatedly: each command can be executed up to 999 times, program slope can be set by the timeline, programs can be linked and used, and program creation adopts conversational operation with simple operation

Equipped with functions such as editing, clearing, and inserting, with 4 sets of time signal output control (controllable control of the ON/OFF action of the test object)

It has 9 sets of PID parameter settings, with jump and hold functions during program execution, and can display curves and obtain data; Date and time adjustment function; Button and screen lock (LOCK) function, can be connected to a computer for use

Communication RS-232 interface, can be used as a monitoring and remote control system, record test data

Running mode, program mode/fixed value mode

Setting method: Chinese/English interface, touch input

Set the maximum temperature range with upper and lower limits of 5 ℃

Display resolution temperature: 0.01 ℃; Humidity: 0.1%; Time: 1min;

The power-off memory function can set the power-off recovery mode to: hot start/cold start/stop

The scheduled startup function allows for the setting of the startup time at will, and the machine will automatically run when the power is turned on

Input PT100 platinum resistor

The curve recording function has RAM with battery protection, which can save the set values, sampling values, and sampling time of the device; The maximum recording time is 60 days (when the sampling period is 1.5 minutes)

Software usage environment: IBM PC compatible machine, CPU with P Ⅱ or above, 128MB or above memory, Simplified Chinese Windows 2000 or Simplified Chinese Windows XP operating system

Circulating fan, low-noise multi wing centrifugal fan

Imported nickel chromium alloy electric heater

Heater control method: contactless equal period pulse width modulation, SSR (solid-state relay)

Imported nickel chromium alloy electric heater for humidifier

External wetting method

Control method: anti integral saturation PID, BTC balance temperature control method (temperature testing equipment)

BTHC Balanced Temperature and Humidity Control Method (Temperature and Humidity Testing Equipment)

Wet heat system water supply (only wet heat type)

Water supply method: pump lifting

Water supply device 1. The machine is equipped with a small soft water machine filter unit, which only needs to be connected to tap water to automatically produce the required purified water for spraying, effectively preventing impurities in the water quality from adhering to the surface of the sample and affecting the test results; Water supply pressure: 0.1-0.4Mpa

2. PVC large water tank, can be manually refilled when water supply is inconvenient

The water supply quality requires a resistivity of ≥ 500 Ω; m

Safety protection device

Refrigeration system compressor overheating, overcurrent, overpressure, condensing fan overheating

Test box extreme overheating, fan, motor overheating relay

Humidification system with wet heat pipe dry burning, abnormal water supply, abnormal drainage, and abnormal water shortage

Power leakage protection, overload and short circuit protection

Storage environment requirements: The equipment environment temperature should be maintained within 0 ℃ to+35 ℃

The installation site requires that the distance between the left, right, and rear wall panels of the test box and the wall should not be less than 800mm, and the distance between the front and the wall should not be less than 1000mm. When transporting equipment, whether it is possible to enter the entrance or passage, elevator, etc., to avoid affecting the progress of your company's project.

Transportation method: Whole machine transportation

Acceptance criteria and third-party verification

1. Acceptance criteria: Technical indicators shall be in accordance with the methods specified in the "Technical Agreement" B/T5170-1995 standard signed by both parties.

2. Acceptance method: Formal acceptance shall be conducted on the site of the purchaser.

3. If the purchaser needs to invite a third party (verified by the National Environmental Testing Equipment Quality Inspection Center and issued a valid inspection report) to participate in the acceptance before leaving the factory, the cost shall be borne by the purchaser. If the first acceptance is not qualified, the cost incurred during the second acceptance after improvement by the supplier shall be borne by the supplier.

4. The customer entrusts the National Environmental Testing Equipment Quality Inspection Center to conduct calibration on their own.