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Large scale alternating humid and hot environment test rooms commonly used in research institutes
The research institute commonly uses large alternating humidity and heat environment test rooms. The large alternating humidity and heat test room is
Product details
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6. Refrigeration system |
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6.1. way of working |
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6.2. refrigeration compressor 6.3. evaporator 6.4. condenser 6.5. throttling device |
Mechanical compressor finned heat exchanger shell and tube heat exchanger Thermal expansion valve, capillary tube |
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6.6. evaporation-condensation |
Brazed plate heat exchanger |
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6.7. Control mode of refrigeration machine
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The control system automatically adjusts the operating conditions of the refrigeration machine according to the test conditions Condensation pressure regulating valve (cooling water flow regulating device) Evaporative pressure regulating valve (to prevent evaporator icing) Compressor return air cooling circuit Energy regulation circuit |
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6.8. refrigerant |
R404A |
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6.9. other
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The main components are made of internationally renowned brand products Compressor cooling fan Cooling water filter |
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7. Electrical control system |
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7.1. controller Model |
TEMI-880 |
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monitor |
10.4-inch 640X480 dot matrix TFT color LCD display |
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Operation mode |
Program mode, fixed value mode |
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Setting method |
Chinese menu, touch screen input |
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Program capacity |
Editable: 20 programs. Each program has 50 steps and can have 20 loops (99 cycles per step) Fixed: 10 programs Program linkable |
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Setting Range |
Temperature: Adjust according to the temperature working range of the equipment (upper limit+5 ℃, lower limit -5 ℃) Humidity: 0-100% RH; (If the device has humidity function) |
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display resolution |
Temperature 0.1 ℃; Time 0.1 minutes Humidity 0.1% RH (if the equipment has humidity function)
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Input |
Thermocouple (platinum resistance/voltage/current, etc., depending on equipment requirements) |
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communication (Purchase) |
RS-485 interface, with local and remote communication functions with PC (as an optional accessory, requires RS-232/485 converter, PC and Windows 2000 Simplified Chinese version operating system, occupying one serial port and one USB port of the PC); The length of the large cable is 800m |
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control mode |
Anti integral saturation PID BTHC (Temperature and Humidity Testing Equipment)
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Curve recording function |
RAM with battery protection, capable of storing device settings and sampling values; And the time of sampling; The maximum recording time is 60 days (when the sampling period is 1.5 minutes) |
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USB function
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One USB flash drive (with a capacity of not less than 1G) and one PC specific software CD. Develop a test program using PC specific software and save it to a USB drive. Then, retrieve the test program from the USB drive and store it in the controller; The programs inside the controller can also be transferred to a USB drive and stored on a PC for analysis and management. The test curve data recorded in the controller can be transferred to a USB drive. Directly display and print test data/curves through PC specific software (with non modifiable markings on the printed data); Or convert the recorded data into an Access data file that can be read by Microsoft Office. The test curve data recorded by the controller is: 2-channel temperature - set temperature and measured temperature; 2-channel humidity - set humidity and measured humidity (temperature and humidity testing equipment) |
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Auxiliary functions |
Fault alarm and cause, processing prompt function A fail-safe mechanism Upper and lower temperature protection function Calendar timing function (automatic start and automatic stop operation) self-diagnosis |
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7.2. temperature and humidity measurement
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Temperature: T-shaped armored thermocouple Humidity: Dry wet bulb thermometer method
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8. Wet heat system water supply Only HW |
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External water supply Principles of Water Treatment Internal water supply method Location of water treatment equipment Power supply for water treatment equipment water quality |
tap-water Multi stage filtration reverse osmosis pure water device (equipped with pressure storage tank) Constant pressure water supply for pure water purifier External, with nearby water sources and drainage floor drains, not more than 30 meters away from the laboratory mechanical room Single phase AC220V, 10A national standard 3-core power socket Electrical resistivity>500 Ω· m
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9. Safety protection device |
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9.1. refrigeration system |
Compressor overpressure Compressor motor overheating Compressor motor overcurrent Insufficient pressure of cooling water supply Compressor oil pressure differential under pressure (limited to semi enclosed compressors with pressure differential interfaces)
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9.2. Humidification system (HW type only) |
Heating tube dry burning Abnormal water supply Abnormal drainage
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9.3. laboratory |
Adjustable over temperature protection Test space temperature fuse Extreme overheating of air conditioning channel Security door lock that can be opened from the inside Fan motor overheating
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9.4. other |
Main power phase sequence and phase loss protection Leakage protection Load short-circuit protection
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10. Other configurations |
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Power cable Sample power terminal
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Five core (four core cable+protective grounding wire) cable 1 (6 meters long) Relay contact control, within 220VAC 2A (when operating normally, the contacts close; when the equipment stops or malfunctions, the contacts open) Main power leakage circuit breaker |
1. Temperature range:- 0℃~100℃
2. Humidity range: 30~98% RH (at temperatures between 25 ℃~80 ℃)
3. Temperature uniformity: ≤ 2 ℃ (when unloaded)
4. Humidity uniformity:+ 2- 3%RH
5. Temperature fluctuation: ± 0.5 ℃ (when unloaded)
6. Humidity fluctuation: ± 2%
7. Temperature deviation: ± 2 ℃
8. Humidity deviation: ± 2%
9. Cooling rate: 0.7~1.0 ℃/min
10. Heating rate: 1.0~3.0 ℃/min
11. Time setting range: 1~9999H
12. Humidity fluctuation range: 40~98% RH
existConstant temperaturewetIn the laboratory field, Nanjing Expansion Technology Co., Ltd. has achieved brilliant achievements with rich experience. With the increasingly strict requirements for quality control and the growing demand for constant temperature and humidity environments, the application fields are also becoming wider. Constant temperature and humidity test room/Constant temperature and humidity test chamber/Walk in constant temperature and humidity test room/Walk in constant temperature and humidity test chamber
1. Laboratory decoration: strict insulation and moisture insulation performance is required. It is recommended to use color steel composite panels for the four facades of the laboratory, and PE insulation panels for insulation and moisture insulation treatment for the top and bottom surfaces; For perspective windows, it is required to use double-layer vacuum glass windows.
2. Laboratory air conditioning: Laboratory air conditioning is the heart of temperature and humidity control, requiring high precision and low failure rate. So it is necessary to require the air conditioner to be able to adjust the cooling capacity. There are already two ways on the market: one isbecome differentfrequentAdjustment; Another way is to regulate chilled water. Variable frequency regulation: In fact, it is to change the power of the compressor by changing the nature of the power supply, so that the compressor can achieve low load operation or overload operation, while adjusting the throttling capacity of the refrigeration system. Therefore, it is necessary to add a lot of complicated links, and each link must be well matched, otherwise faults will occur. The reality is indeed like this, with a very high failure rate, represented by the brand 'Yodon'. Chilled water unit: Using cold water at around 7 ℃ as the cooling source, the water flow is controlled by opening or closing an electric valve to easily control the cooling capacity. The electric valve structure is as simple as a household faucet, so the failure rate is almost zero and the control effect is stable. By reasonably calculating the heat and humidity load and air dew point of the room to match the air volume, cooling capacity, heating capacity, and humidification capacity, and controlling the stepless regulation of each component through PLC, and selecting sensors with high sensitivity and good linearity, it is possible to achieve temperature within ± 0.1 ℃ and humidity within ± 1%. This method requires calculation and matching based on the actual area and load of each laboratory, so there are no standard forming units, and they are all customized processing types. Generally, a combination of air conditioning units is used to achieve the combination ratio, so the disadvantage is that it occupies a large area.
3. The ventilation method has gone through several historical stages, from the initial bottom air outlet, to the upper natural air supply, to the upper diffuser air supply, and now to the advanced upper air duct+microporous ceiling air supply, and lower floor return air method. The entire laboratory air supply is soft and uniform, and the temperature and humidity control is very stable.
4. The function of the fresh air system is to provide physiological fresh air for the staff, and it is also essential for the stable determination of laboratory temperature and humidity. In order to protect the laboratory from external interference, it is necessary to provide fresh air to the laboratory to maintain a positive air pressure, so that external air cannot enter the laboratory and ensure the stable temperature and humidity throughout the year.
With a wide temperature and humidity control range, it can meet various needs of users. Adopting a unique balanced temperature and humidity control method, it can achieve safety and precisionThe temperature and humidity environment. It has stable and balanced heating and humidification performance, and can achieve high-precision and highly stable temperature and humidity control.
Equipped with high-precision intelligent temperature regulators, the temperature and humidity are controlled by a full LCD display 7751 programmable instrument (the Japanese OYO LCD display 5461 programmable instrument can also be replaced according to user needs). Optional temperature and humidity recorder.
According to functional requirements, a computer can be optionally equipped for remote control.
Automatic selection of refrigeration circuit, the automatic control device has the performance of automatically selecting and operating the refrigeration circuit according to the set value of temperature, realizing direct start of the refrigeration machine and direct cooling under high temperature conditions.
The inner door is equipped with a large observation window, which facilitates the observation of the test status of the test sample.
Equipped with advanced safety protection devices such as residual current circuit breakers, over temperature protectors, phase loss protectors, and water cut-off protectors.
Studio Standard Cube:
0.5, 1.0, 2,... 25, 30, 40 cubic meters (cubic meter)
Upper Temperature Limit:
100℃
Lower Temperature Limit:
-70℃
Temperature Deviation:
±2℃
Temperature fluctuations:
±0.5℃
Humidity Range:
30-98%R.H
Humidity error:
+2/-3%R.H
Heating Time:
Average 1 ℃/min
Cooling Time:
Average 1 ℃/min
Cooling method:
Water cooling
Controller:
Chinese LCD touch screen temperature controller, PID control algorithm Chinese LCD screen temperature controller, PID control algorithm
User program capacity Formula Capacity:
120 groups, 1200 sections
Security protection measures:
Temperature upper limit control, compressor overpressure, compressor overload, heater short circuit temperature control, compressor supervoltage, compressor overload , heater short circuit
Power Supply:
380V, 50Hz, Three phase four wire
Material:
SUS#304
Function:
Program control temperature and humidity
Imported microcomputer humidity temperature integrated controller (humidity directly displayed as a percentage).
Accuracy Range Setting Accuracy: Temperature ± 0.1 ℃, Humidity ± 0.1% R · H, Indication Accuracy: Temperature ± 0.1 ℃, Temperature ± 0.1% R · H Temperature and Humidity Sensor Platinum Resistance · PT100 Ω.
The heating system is a completely independent system, using nickel chromium alloy electric heating type heaters.
External isolation type humidification system, all stainless steel boiler type shallow surface evaporative humidifier.
Circulating system temperature resistant and low-noise air conditioning motor, multi blade centrifugal fan.
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