The following is a technical guide for the entire installation process of high and low temperature test chambers, covering core links such as environmental preparation, equipment positioning, system debugging, and acceptance maintenance:

1、 Environmental planning and site preparation before installation

1. Physical Space Design

-Size reservation principle: An operation and maintenance channel of ≥ 80cm should be reserved around the equipment, with a top distance of ≥ 1m from the ceiling to ensure smooth air circulation. For example, for a test chamber with a capacity of 1000L, it is recommended that the independent room area be no less than 4 square meters.

-Calculation of bearing strength: The bearing capacity of cement floor should be ≥ 500kg/m ². If it is a tile/wooden floor, load-bearing steel plates should be installed for reinforcement.

2. Environmental parameter control

-Temperature and humidity threshold: The installation site should maintain a temperature of 15-30 ℃ and a relative humidity of ≤ 85% RH to avoid electrical short circuits caused by condensation water.

-Electromagnetic interference isolation: Keep away from strong interference sources such as high-frequency welding machines and large motors, with a horizontal distance of>5m. If necessary, add metal shielding nets.

3. Infrastructure support

-Power supply system upgrade: Adopting a three-phase five wire system (380V ± 7%, 50Hz), with independent air switch capacity ≥ 1.5 times the equipment power.

-Pre embedded drainage device: DN25 drainage pipe should be pre installed in the wet heat test chamber, with a slope of ≥ 3 ° leading to the floor drain, and right angle elbows are prohibited to prevent blockage.

2、 Equipment positioning and mechanical assembly

1. Handling and earthquake prevention measures

-Tilt angle limit: During transportation, the tilt angle should be ≤ 15 ° to prevent the compressor lubricating oil from shifting.

-Shock absorption treatment plan: Install rubber shock absorbers (Shore hardness 60 ± 5HA) at the bottom to reduce resonance noise during operation.

2. Horizontal calibration process

-Precision square finding method: Use a laser level to detect and adjust the foot bolts to make the inclination of the box ≤ 0.2mm/m.

-Verification method: Run in vibration mode for 10 minutes and observe if the amplitude value is below 0.5mm.

3. Peripheral interface connection

-Strengthen the sealing of the air duct: Install silicone high-temperature resistant sealant between the box and the ventilation opening to prevent the leakage of cold air.

-Customization and adaptation of sample rack: SUS304 stainless steel bracket is selected according to the sample shape, with spacing ensuring airflow penetration rate>90%.

3、 Power system and signal access

1. Electrical safety regulations

-Mandatory standard for grounding resistance: The dedicated grounding pile should be buried at a depth of ≥ 2m, with a resistance value of<4 Ω, and it is strictly prohibited to borrow building steel bars.

-Cable specification matching: YCW cold resistant rubber sheathed cable is selected for the main circuit, and the cross-sectional area is calculated according to the formula.

2. Joint debugging of control system

-PLC program loading: Import preset heating/cooling slope curves through the touch screen, such as the "High Temperature Operation" program in military GJB 150.3A-2009.

-Sensor calibration matrix: Arrange 9 thermocouples at the geometric center point of the box, compare the deviation between the set value and the measured value, and activate the PID self-tuning function when the deviation is exceeded.

4、 Trial operation and performance verification

1. No load aging test

-Extreme working condition challenge: Continuously execute the cycle of -70 ℃ →+150 ℃ for 3 times, with each conversion time ≤ 5 minutes, and test the cooling/heating response speed.

-Data recording frequency: Collect temperature data once per minute, draw a uniformity distribution map, and require a temperature difference of ≤ ± 2 ℃ between any two points in the working area.

2. Load capacity verification

-Heating simulation test: Place a nickel chromium wire dummy load with a total power of 2kW and monitor the cooling rate attenuation ratio, which should not be lower than 85% when unloaded.

-Open door recovery test: Interrupt the operation and open the door for 3 minutes before closing it. Record the time required for the system to return to normal settings.

3. Inspection of Security Protection Mechanisms

-Dual protection against overheating: trigger the manual emergency stop button to confirm the synchronous cut-off of heating/cooling; Simulate sensor failure and verify the automatic switching of backup probe function.

-Pressure alarm linkage: artificially create cooling water pressure as low as 0.1MPa, check whether the compressor stops immediately and sound and light alarms.

5、 Document handover and long-term operation and maintenance

1. Delivery of completion documents

-3D completion file: including equipment layout BIM model, pipeline routing diagram, and I/O address allocation table.

-Archiving of measurement certificates: accompanied by temperature uniformity and fluctuation detection reports issued by third parties.

2. Preventive maintenance plan

-Quarterly maintenance checklist: Clean the condenser fins for dust accumulation and replace the dry filter; Annual replacement of refrigeration oil.

-Consumables life cycle table: Establish a warning mechanism for the replacement of vulnerable parts (such as silicone seals and contactor contacts).