Repair imported high and low temperature test chamber

Name and Model

CC-1003 High and Low Temperature Test Chamber

Product advantages

As an environmental testing equipment, high and low temperature test chambers play an important role in the manufacturing and maintenance of high and low temperature test chambers. In recent years, with the increasingly widespread application and continuous improvement of technology, manufacturers and maintenance industries of high and low temperature test chambers have higher technical requirements for them, leading to a few manufacturers of high and low temperature test chambers also approaching technology.

Sample Description

CC-1003 High and Low Temperature Test Chamber

This experimental equipment prohibits:

Testing and storage of samples of flammable, explosive, and volatile substances

Testing and storage of corrosive substance samples

Testing or storage of biological samples

Testing and Storage of Strong Electromagnetic Emission Source Samples

Volume and size

Nominal internal volume: 100L

Inner box size: W 500 × H 500 × D 400 mm
Dimensions: Approximately W 728 × H 1680 × D 1170 mm

Performance:

Test environment conditions

The airflow around the equipment is unobstructed, without high concentration dust, corrosive or flammable gases
The ambient temperature is between 5-35 ℃
Relative humidity ≤ 85% RH
Circulating cooling water temperature ≤ 30 ℃
The supply pressure of circulating cooling water is 0.25-0.4MPa (not required for air-cooled equipment)

Test method: Temperature change rate meets relevant standards

temperature range

-40 ℃~+150 ℃ (optional -20 ℃~+150 ℃; -70 ℃~+150 ℃)

temperature fluctuation

Under no-load conditions of ≤± 0.5 ℃, the temperature variation of the center point of the working space over time when the equipment is in a stable state is half of the difference between the measured temperature and the low temperature, represented by "±", which is the temperature fluctuation degree ℃.

Temperature Uniformity

The arithmetic mean of the difference between the measured temperature and the low temperature during each test after the equipment reaches stability under no-load conditions of ≤ 2 ℃, which is the temperature uniformity.

5.2.4 Temperature deviation

The temperature deviation is the difference between the average value measured at the center point of the equipment within the specified time and the average temperature displayed on the equipment under no-load conditions of ≤± 2.0 ℃.

5.2.5 Temperature change rate

Heating rate: RT+10 ℃~+150 ℃ ≤ 45 min Average heating rate: 2-3 ℃/min

Cooling rate: RT+10 ℃~-40 ℃ ≤ 70 min Average cooling rate: 0.7-1 ℃/min

structural characteristics

Thermal insulation enclosure structure

Outer wall material: high-grade A3 steel plate with electrostatic spraying or stainless steel plate SUS304

Inner wall material: stainless steel plate SUS304,

Box thermal insulation material: rigid PU foam 100MM

Windows

single door
Observation window size of thermal anti condensation insulated glass for power distribution on the door: 220cm * 260cm

Door frame equipped with anti condensation electric heating device

Control Panel

Temperature (humidity) control display screen, over temperature protection setting device, emergency stop switch, operation indicator light, fault indicator light, buzzer, operation button, lighting switch

machine room

The mechanical room includes: refrigeration unit, drainage system, fan, and distribution control cabinet

distribution control cabinet

Cooling fan, buzzer, temperature and humidity recorder (optional), distribution board, sample test terminal

RS-232 physical interface

Main power leakage circuit breaker

heater

Nickel chromium alloy electric wire heater

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

refrigeration system

working method

Air cooled mechanical compression refrigeration method

制冷原理

The refrigeration methods are divided into vapor compression refrigeration, absorption refrigeration, vapor jet refrigeration, gas expansion refrigeration, and thermoelectric refrigeration. Among the above refrigeration methods, vapor compression refrigeration is a widely used refrigeration method and also a refrigeration method 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 cooled object and achieve refrigeration. The single-stage refrigeration cycle diagram is a schematic diagram of the vapor compression refrigeration cycle process. The liquid entering the evaporator through expansion valve throttling absorbs latent heat of evaporation from surrounding objects and evaporates. After evaporation, it becomes a low-temperature and low-pressure gas that is sucked in by the refrigeration compressor. After compression by the compressor, it becomes a high-temperature and high-pressure gas that enters the water-cooled or air-cooled condenser, where it is cooled into high-pressure liquid, and then enters the evaporator through the expansion valve. This cycle repeats, absorbing heat from low temperatures to achieve refrigeration, and then releasing heat from high temperatures.

Single stage refrigeration cycle diagram

In the refrigeration cycle shown in the single-stage refrigeration cycle diagram, a change from one state to another is called a process. The refrigeration cycle consists of four processes. Below are four processes in the refrigeration cycle.

Evaporation process: Low pressure wet steam, after expansion and throttling, absorbs heat and cools from the surrounding medium in the evaporator, gradually increasing its dryness. In this way, the gas coming out of the evaporator has become dry saturated vapor or slightly superheated vapor. During the evaporation process, the temperature and pressure of the refrigerant remain constant.

Compression process: After completing the refrigeration effect, the vapor coming out of the evaporator enters the refrigeration machine, and after compression, the temperature and pressure rise sharply. So the gas discharged from the refrigeration machine becomes hot steam with high degree of superheat. During the compression process, the entropy value of the refrigerant remains unchanged.

Condensation process: The high-temperature and high-pressure superheated vapor discharged from the refrigeration unit enters the condenser and exchanges heat with cooling water or air, gradually turning the superheated vapor into saturated vapor and then into saturated liquid. When cooled with cooling water, the saturated liquid temperature will continue to decrease, resulting in supercooling. The pressure remains constant during the condensation process.

Throttling process: The liquid coming out of the condenser is throttled by expansion valves or capillary tubes and other throttling devices, becoming low-temperature and low-pressure wet vapor. During the throttling process, the enthalpy value of the refrigerant remains unchanged.

The above four cycles are continuously cycled in sequence to achieve the cooling purpose.

To complete the thermodynamic processes of the refrigeration cycle, it is necessary to form a system consisting of a compressor, heat exchanger, piping, piping accessories, etc., which is called a refrigeration system.

Single stage compression refrigeration refers to the compression of refrigerant vapor only once, and its low evaporation temperature can be controlled between -30 ° C and -40 ° C. When a lower test temperature is required, a cascade refrigeration system is usually used, which involves stacking two single-stage compression refrigeration systems together. One of the systems is the high-temperature section, using medium temperature refrigerant; The other system is the low-temperature part, which uses low-temperature refrigerant. The evaporator in the high-temperature section overlaps with the condenser in the low-temperature section to form a condensing evaporator.

refrigeration compressor

French Taikang low-temperature high-efficiency fully enclosed compressor

evaporator

Finned heat exchanger

Throttling device

Thermal expansion valve, capillary tube

Control mode of refrigeration machine

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)

Compressor return air cooling circuit

Energy regulation circuit

refrigerant

other

R404A

The main components are made of high-quality branded products (please refer to the quotation list)

electric control system

Controller Model

High precision programmable self-developed controller with 7-inch touch screen

Feature Overview

The controller system mainly consists of two parts. Namely LCD control panel and input/output control board (I/O board).

The LCD controller displays the cause and solution of the fault in Chinese characters based on the alarm signal transmitted through communication to the I/O board; Users can choose between English and Chinese menus as needed; The LCD controller is equipped with a lithium battery and a calendar clock in its memory. It has the functions of power outage protection and timed power on/off.

monitor

7-inch 320X240 dot matrix high contrast LCD display with backlight function

Operation mode

Program mode, fixed value mode

Setting method

Chinese menu, touch screen input

Specifications:

8.2.1 Accuracy: Temperature ± 0.1% F.S

8.2.2 Resolution: Temperature 0 1℃

8.2.3 Temperature slope: adjustable from 0.1 to 99 ℃

8.2.4 Equipped with upper and lower limit standby and alarm functions

8.2.5 Input signal: DRY/NET, PT100/4-20mA 4-20mA 4-20mA/4-20mA selection

8.2.6 Temperature conversion output: 10mv/1 ℃,

8.2.7 Six sets of PID control parameter settings, PID automatic calculation

8.3 Screen display function:

8.3.1 Face to face dialogue with drawing, no need for button input, touch options directly on the screen

8.3.2 Direct display of temperature and humidity settings (SV) and actual (PV) values

8.3.3 Can display the current execution program number, segment number, remaining time, and number of cycles

8.3.4 Accumulated operating time function

8.3.5 Temperature and humidity program settings are displayed in graphical curves, with real-time display of program curve execution function

8.3.6 With a separate program editing screen, each page can input 10 segments of temperature, humidity, and time

8.3.7 Fixed point or program action status display

8.3.8 Chinese display: a. Precautions before startup, b. Maintenance methods, c. Troubleshooting instructions

8.3.9 The screen can be adjusted for 17 backlight segments

8.3.10 The screen display protection function can be set to timed, TIMER, or manually disabled

8.4 Program Capacity and Control Function

8.4.1 Available program quantity: Up to 20 groups, each program is 59 steps long, and can be set up to 20

8.4.2 Available memory capacity: 1000 SEGMENT

8.4.3 Repeatable Command Execution: Each program command can be executed up to 99 times

8.4.4 The production of the program adopts a conversational approach and has functions such as editing, clearing, and inserting

8.4.5 Three sets of time signal output control (controllable control of the ON/OFF action of the test object)

8.4.6 Program execution with skip file and hold function

8.4.7 SEGMENT Time Setting 0-99Hr59min

8.4.8 Has power-off program memory, automatically activates and continues to execute program functions after power restoration

8.4.9 Equipped with RS-485 communication interface (software sold separately)

8.4.10 Real time display of graphical curves during program execution

8.4.11 Equipped with reservation activation and shutdown functions

8.4.12 has date and time adjustment function

8.4.13 Button and screen lock (LOCK) function

The 8.4.14 system can also be equipped with a printer to record temperature data during the testing process, and can also be used to print a user set list of testing procedures.

8.5 Input: T-shaped armored thermocouple.

8.6 Communication function (optional):

RS-485 interface, with local and remote communication functions (requires monitoring software, RS-485/RS-232 converter, and occupies one COM port of the PC); Multiple devices can be connected simultaneously, with a cumulative cable length of 800m

8.7 Control mode:

8.7.1 Anti integral saturation PID

8.7.2 BTC Balance Temperature Control Method (Temperature Test Equipment)

8.7.3 BTHC Balance Temperature and Humidity Control Method (Temperature and Humidity Test Equipment)

8.8 Printing function: Can be connected to a temperature and humidity recorder (optional)

8.9 Auxiliary functions:

Fault alarm and cause, processing prompt function, power-off protection function, upper and lower temperature protection function, timing function (automatic start and automatic stop operation), self diagnostic function.

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

8.11 Temperature and humidity measurement

Temperature: T-shaped armored thermocouple

8 Safety protection devices

refrigeration system

Compressor overpressure

Compressor motor overheating

Compressor motor overcurrent

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

other

Main power phase sequence and phase loss protection

Leakage protection, load short circuit protection

One five core (four core cable+protective grounding wire) cable (2.5 meters long)

Other configurations

Sample power terminal

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

10. Choose attachments (functions). The following attachments (functions) should be quoted separately and specifically stated in the contract or technical agreement

power cable

One five core (four core cable+protective grounding wire) cable (provided according to customer requirements)

Lead hole

The lead holes have diameters of 50mm and 100mm, and their positions and quantities can be customized according to user requirements within the allowable conditions of the chamber structure

Centralized monitoring software

Used for remote centralized monitoring, equipped with one RS-485/RS-232 converter along with the software (centralized monitoring software)

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

transportation

The main structure of the laboratory is assembled, and each part is transported to the user's installation site for assembly

The refrigeration system and air conditioning channel are transported as separate units

Large transportation unit size (excluding packaging): see external dimensions.

The user guarantees the following conditions for use

venue

The ground is flat, well ventilated, and free of flammable, explosive, corrosive gases and dust

There is no strong electromagnetic radiation source nearby

There is a drainage floor drain near the equipment (within 2 meters of the refrigeration unit)

Ground bearing capacity of the venue: not less than 600kg/m2

Leave appropriate maintenance space around the equipment

environmental conditions

The airflow around the equipment is unobstructed, without high concentration dust, corrosive or flammable gases
Temperature: 5 ℃~35 ℃

Relative humidity: ≤ 85% RH

Air pressure: 86-106kpa

power supply

AC220V single-phase two-wire+protective earth wire

Voltage allowable fluctuation range: AC (1 ± 10%) 220V

Allowable frequency fluctuation range: (1 ± 1%) 50Hz

The grounding resistance of the protective grounding wire is less than 4 Ω; TN-S power supply or TT power supply

Require users to configure corresponding capacity air or power switches for the equipment at the installation site,

And this switch must be independent and specifically designed for use with this device

Total High Power: 5.5 kW

Requirements for storage environment

When the equipment is not working, the ambient temperature should be maintained within 5-35 ℃

When the ambient temperature is below 0 ℃, the water remaining in the equipment should be drained completely to prevent the water in the pipeline from freezing