High and Low Temperature Damp Heat LaboratoryDue to its large size, it is inconvenient to move or move around, and the complex circuit often makes it difficult for users to handle faults. In order for users to quickly diagnose and solve faults by themselves in a timely manner, the following are some repair and solution methods for test box faults.
One When the temperature and humidity controller displays abnormal temperature conditions
Inspection steps:
1. Please check if the over temperature protector on the control panel is set at the 150 ℃ position;
2. Please check if the circulating motor in the computer room is damaged and not running;
3. Please check if the solid-state relay in the temperature section is burnt out and short circuited: If the heater is not burnt out, please use a multimeter with AC voltage mode set to 600 volts. Place the red and black bars on both sides of the solid-state relay marked as T, and set the temperature setting value of the temperature section to 0 ℃. At this time, the indicator light of the solid-state relay in the temperature section will not light up. If the measured voltage value does not change and remains below 10V, it means that the solid-state relay is burnt out and shows a short circuit state.
Solution:
1. If not available, please turn the panel over temperature protector to the position of 150 ℃, or to the position where the temperature is increased by an additional 30 ℃;
2. Please notify the manufacturer's customer service and maintenance department to replace the circulating motor;
3. Please replace the solid-state relay in the temperature section;
II When the temperature and humidity controller displays abnormal humidity conditions
Inspection steps:
1. Please check if the under water and over temperature protector in the control room is set at a temperature of 150 ℃;
2. Please check if the pipelines in the computer room are too dirty, causing poor water flow;
3. Please check if there is water in the upper water tank. If there is no water, then check if there is water in the lower water tank;
4. Please check if the solid-state relay in the humidity section is burnt out and short circuited: If the heater is not burnt out, please use a multimeter with AC voltage range set to 600 volts. Place the red and black bars on both sides of the solid-state relay marked with line number H, and set the humidity setting value of the humidity section to 0%. At this time, the indicator light of the solid-state relay in the humidity section will not light up. If the measured voltage value does not change and remains below 10V, it means that the solid-state relay is burnt out and shows a short circuit state. Or set the humidity setting to 0% first, and then check if the water in the humidification tank in the computer room is boiling.
Solution:
1. If not, please turn the under water and over temperature protector to the position of 150 ℃;
2. Please turn off the main power supply behind the machine first, and then open the drainage valve under the humidification bucket to a position parallel to the pipeline. When the water in the water tank is drained, use a wrench to open the humidification bucket and remove the scale inside due to long-term humidity. Then remove the silicone tube and scrub it in water. After maintenance, reinstall it in the opposite direction according to the removal method. After installation, close the drainage valve under the humidification bucket to a position perpendicular to the pipeline, and then turn on the main power supply behind the machine;
3. There is no water in both the upper and lower water tanks. Please add water to the lower water tank to solve the problem.
If there is no water in the upper water tank and there is water in the lower water tank, it means that the water intake motor of the lower water tank is broken. Please notify the Huaxia Environmental Testing and Maintenance Customer Service Department to come and repair it;
4. Please replace the solid-state relay in the humidity section;
III When the temperature and humidity controller displays abnormal pressure conditions
Inspection steps:
1. Please check the placement of the equipment to see if there is a distance of more than 30 centimeters from the wall;
2. Is the surrounding area a sealed space.
Solution:
1. If not available, please maintain a position of at least 30 centimeters around the machine, as poor heat dissipation can cause excessive pressure on the high-pressure side of the compressor;
2. If the surrounding area is a sealed space, it will cause temperature rise in the environment and also result in high pressure on the high-pressure side of the compressor. Therefore, please maintain ventilation around the area.
4 When the temperature and humidity controller displays an abnormal condition of the compressor
Inspection steps:
1. Please check the placement of the equipment to see if there is a distance of more than 30 centimeters from the wall;
2. Is the surrounding area a sealed space.
Solution:
1. If not available, please maintain a position of at least 30 centimeters around the machine, as poor heat dissipation can cause an increase in the operating current of the compressor, resulting in the action of the overcurrent protector;
2. If the surrounding area is a sealed space, it will cause a temperature rise in the environment, as well as an increase in the operating current of the compressor, resulting in the action of the overcurrent protector (integrated thermal relay). So please keep the surroundings ventilated;
3. After the above questions have been resolved, please install the overcurrent protectors (integrated thermal power station) below the three electromagnetic switches in the computer room. Press the reset button down and hear a clicking sound, indicating that the compressor being controlled is overloaded. However, it has also reset. Please adjust the current setting to 1.25 times the rated current of the compressor.
Five When the temperature and humidity controller is running, the actual humidity value cannot reach the set value, and the actual humidity value is much lower than the set humidity value
Inspection steps:
1. Please check if the solid-state relay in the humidity section is burnt out and open circuit: If the heater is not burnt out, use an AC voltage range on the electricity meter, set the voltage range to 600 volts, place the red and black bars on both sides of the solid-state relay marked as H, set the humidity setting value of the temperature section to 100%, and the indicator light of the solid-state relay in the humidity section will light up. If the measured voltage value does not change and remains at 220V or 380V, it means that the solid-state relay is burnt out and shows an open circuit state;
2. Check if the fuse is burnt out;
3. Please check if the humidification bucket heater is burnt out: Cut off the two wires of the humidification bucket heater, use a multimeter with an ohm range, and measure the resistance value. If the resistance shows infinite, it means the heater is burnt out.
Solution:
1. Please replace the solid-state relay in the humidity section;
2. Please replace the fuse with the same specification;
VI When the temperature and humidity controller is running, the actual temperature value cannot reach the set value, and the actual temperature value is much lower than the set temperature value
Inspection steps:
1. Please check if the solid-state relay in the temperature section is burnt out and open circuit: If the heater is not burnt out, use an AC voltage range on the electricity meter, set the voltage range to 600 volts, place the red and black bars on both sides of the solid-state relay marked as T, set the temperature setting value of the temperature section to 100 ℃, and the indicator light of the solid-state relay in the temperature section will light up. If the measured voltage value does not change and remains at 220V or 380V, it means that the solid-state relay is burnt out and shows an open circuit state;
2. Check if the fuse is burnt out;
3. Please check if the heater inside the box is burnt out: Cut off the two wires of the heater inside the box, use a multimeter with an ohm range, and measure the resistance value. If the resistance shows infinite, it means the heater is burnt out.
Solution:
1. Please replace the solid-state relay in the temperature section;
2. Please replace the fuse with the same specification;
7 When the temperature and humidity controller is running, the actual humidity value remains at 100%
Inspection steps:
1High and Low Temperature Damp Heat LaboratoryThe condition where the internal air is very dry: 1) First, check if there is water in the fixed seat sink of the wet and dry bulb; 2). Please check whether the wet bulb fixing seat inside the test box, the wet bulb gauze hanging on the wet bulb sensor part, and the sensor part are moist;
2. The air inside the box is very humid (the humidity may not reach 100%, but it is always high): First set the humidity setting to 0%, and then check if the water in the humidification bucket in the computer room is boiling.
Solution:
1. The air inside the box is very dry: 1) If there is no water, please adjust the water level cup in the computer room to the one above it, or check if there is any blockage in the pipeline between the water level cup and the dry wet bulb fixing seat. After adjustment, please use a cloth to absorb the water and ensure that it will continue to flow in. 2). If there is no moisture, please replace the gauze. (It is recommended to replace the gauze once a month) If high temperature and high humidity conditions are frequently used, more replacements are required. If only temperature conditions are used, the gauze can be removed to extend its lifespan. After removal, it can be soaked in alcohol to extend its lifespan;
2High and Low Temperature Damp Heat LaboratoryThe internal air is very humid (the humidity may not reach 100%, but it is consistently high): If boiling occurs, please replace the solid-state relay in the humidity section (the one labeled as H).