Clean of Ultra-low Temperature Freezer

Cleaningmachineshell: Semi-annual First wipe the machine shell from top to bottom with soapy water or disinfectant commonly used in the laboratory, then wipe it thoroughly with clean water, and dry it with a soft dry cloth. Cautions: Avoid using too much water to clean the control board area, in order to prevent leakage damage of circuit components. 

Cleanenvironment of ultra-lowtemperature freezer: Once a month Clean up all ground debris and dust with sanitary ware, reduce dust adsorption in compressor and refrigeration system, affect heat dissipation Prevent dust from adsorbing on circuit board, causing circuit components to be damaged by interference Sealing test of door seals: Once every six months, poor sealing will increase the working time of compressor and cause compressor failure. Open the door, then put in a sheet of A4 paper, close the door, pull A4 paper out, if it is difficult to pull, it shows good sealing. It needs to be tested all around the door seal. 

Clean air filter: Clean at least 4 times a year Grasp the button at the bottom left corner and open the door directly below the cryogenic freezer. Remove the black air filter and wash it with water or neutral detergent. After drying, place the filter in place. If it's already dirty, the dust and debris on it can't be removed, and a new filter needs to be replaced. Clean condenser: at least twice a year Refrigerator radiates heat to the outside environment through condenser. 

Ash accumulation in condenser and filter will cause heat dissipation obstruction and decrease refrigeration efficiency of refrigerator. 

1. Grasp the button at the bottom left corner and open the door directly below the refrigerator. 

2. Use a vacuum cleaner to clean the dust on the condenser, or use compressed air to blow off the dust adsorbed on the condenser, or brush off the dust with a fine brush. Notes: According to the environmental conditions of different laboratories, it is necessary to clean the condenser several times a year. And in the cleaning process, do not damage the radiator on the condenser. Intracavity defrosting: once a year or when the thickness of defrosting exceeds 10 mm High humidity, frequent door opening can easily lead to frost inside the door. Excessive frost, ice will affect the performance of refrigerators, can be deicing shovel and vacuum cleaner deicing. 1. Transfer samples from all chambers to another cryogenic refrigerator 2. Turn off the battery switch, the main power switch, and pull out the power cord. 

3. Open all the inner doors and let the ice melt and wipe it off with a soft rag. 

4. When the frost is removed, the inner cavity needs to be thoroughly cleaned with hot water or detergent (soda water) without chloride and wiped with a dry cloth. 

5. Re-insert the power cord and turn on the main power switch and battery switch. 

6. Samples can be placed after the refrigerator runs empty overnight. 

We are a ultra low temperature freezer manufacturer. Welcome to choose our products.

Web：https://www.lneya.com
Mail：sales@cnzlj.com
Tel：+86-13912479193

What are the effects of power failure on liquid nitrogen cryogenic cold box?

Different industries have different temperature requirements for cryogenic cryostats. Of course, there are many types of cryogenic cryostats. The refrigeration methods used in different industries are different. LNEYA uses compressor refrigeration to achieve refrigeration. The effect is similar to or better than liquid nitrogen cryogenic cryostat.

However, there are still customers who use liquid nitrogen cryogenic cryostats, and customers who encounter power failures when they encounter them do not know how to solve them.

One is the frequent power outage. If the power is cut off frequently, then there will be some damage in the next time the liquid nitrogen cryogenic cold box is started. The compressor is out of the working state, then the compressor will be on the compressor. There is damage. If the power outage is not used for a long time, it is also easy to cause the pipeline inside the liquid nitrogen cryogenic cold box to be damaged and the pipeline refrigerant to leak. Obviously, the impact is relatively large and prone to failure.

In two cases, it is not energized for a long time, because it is cold in the northern part of the winter, so many customers cut off the electricity of the liquid nitrogen cryogenic low temperature box. So what can you do in the end? If the refrigerant is not energized for a long time, the refrigerant will be converted from a gaseous state to a liquid state during operation, and it will be very easy to cause damage to the pipeline, which will lead to leakage. That is, leaking refrigerant.

Then don't frequent power outages. If there is no power failure when the compressor is not working, if there is a sudden power failure and then the power is turned on immediately when the compressor is working, the chance is caused by the large pressure difference between the two ends of the compressor. The liquid nitrogen cryogenic cold box has no way to work, so the thermal protection is stopped. If the protection zone of the liquid nitrogen cryogenic cold box is damaged, the motor will be burnt if it is serious.

It seems that this situation is also more complicated. If you feel that the liquid nitrogen is cold and cold, you can choose LNEYA cryogenic low temperature box or ultra low temperature freezer, and the cooling effect is good.

Cryo Refrigeration -65℃～-10℃

Overview:

• Microcomputer control, cascade temperature controller, digital temperature display, the regulation of unit 0.1℃, inside the temperature range -20 ℃ ~ -125 ℃ adjustable.
• Multi-safety protection, more reliable operation.
• France TECUMSEH compressor, Germany DANFOSS compressor, EMERSON compressor, automatic cascade refrigeration technology.
• With self-diagnosis function, freezer overload protection, high-pressure switches, overload relays, thermal protection device and other security functions, and fully guarantee the use of safety.
• Three sealed mold layer of insulation, Extra-thick high-density polyurethane foam insulation layer, the effect of good insulation; Inline vacuum insulation panels.
• Human design, more convenient and flexible.
• Suitable for mechanical producing plant use, lab refrigerator.

 Technical Parameters:

Model	GX-6528N	GX-6550N	GX-6580N	GY-6528N	GY-6550N	GY-6580N	GY-65A16N
volume	280L	500L	800L	280L	500L	800L	1600L
Inner dimension	610*600*760	800*735*850	1000*800*1000	800*600*600	1200*650*650	1350*800*750	2000*900*900
Type	（Vertical）			（Chest/Horizontal）
Capacibility carrying	150KG	220KG	300KG	150KG	220KG	300KG	650KG
	Designed bearing capacity is two times of the standard one, (refrigeration system is designed according to the standard capacity when target artifact weight is greater than the standard capacity, the cooling rate will decrease)
Temp. range	-65℃～60℃	-65℃～60℃	-65℃～60℃	-65℃～60℃	-65℃～60℃	-65℃～60℃	-65℃～60℃
Cooling capacity at -60℃	1kw	1.5kw	2.5kw	1kw	1.5kw	2.5kw	4kw
Temp. accuracy	±2℃	±2℃	±2℃	±2℃	±2℃	±2℃	±2℃
Heating power	2kw	3kw	5kw	2kw	3kw	5kw	8kw
	Nickel-chromium alloy electric heating heater, the controller has double safety protection, with independent temperature limiter protection.
Cooling rate	(ambient temperature of 25 degrees, no-load, from 60 degrees to -60 degrees about 1 hour).；cooling rate will be a little different for temperature changes.
Controller	ASET multifunctional controller
Operation panel	7-inch color touch screen, display set temperature, measured temperature.
Temp. record	Temperature curve and fault record, U-disk data export, excel format.
Inside circulating air	1650 m³/h	2100 m³/h	2750 m³/h	2100 m³/h	2750 m³/h	3500 m³/h	6000 m³/h
	When it is open, the internal circulation fan automatically turns off. The touchscreen displays open state.
Compressor	Emerson Copeland, adopt cascade refrigeration technology
Intermediate heat exchanger	KAORI Plate heat exchanger
Dry filter	Emerson
Expansion valve	Electronic expansion valve
Evaporator	Copper-tube with aluminum-fin
Cooling Type	Air-cooled with water-cooled auxiliary functions (Ensure good cooling capacity when temp. above 30 degrees)
Means of insulation	Polyurethane foam insulation, thermal insulation layer 125 mm, with embedded FIR boards
Safety Protection	Self-diagnosis function; Phase sequence phase failure protection; leakage protector; cooling unit overload protection; high and low pressure switch, overload relay, thermal protection device, high temperature protection and temperature fault protection.
Case material	Outside is cold rolled steel painting, internal is SUS304 wire drawing board.
Refrigerant	R404A R23
Dimension	1150*1150*1850	1350*1300*1850	1550*1300*2100	2200*1150*1150	2700*1200*1200	2900*1300*1250	3700*1400*1350
Power 380V 50HZ	5.5KW MAX	7.5KW MAX	13.5KW MAX	5.5KW MAX	7.5KW MAX	13.5KW MAX	19KW MAX
Weight	380kg	480kg	650kg	385kg	485kg	650kg	780kg
Optional	High temperature reaches 150degree and temperature accuracy is ±0.5degree；the input power will be changed（When select this model, the thickness of thermal insulation layer will be 150mm，thermal insulation material will be silicate and vacuum plate）
Optional	Closed circulating oil heating system, no direct electric heating element inside the box, suitable for flammable products test
Optional	Temp. accuracy ±0.5℃
Optional	Cooling and heating program controlled, meet cold treatment process requirements(can set 5 programs, each program can edit 45 steps.)
Optional	Interior door, reduce cooling capacity lost when picking small workpieces (temperature below 60 degrees optional)
Optional	Outside SUS304 wire drawing board case
Optional	Diameter 50mm cable hole
Optional	Electric heating vacuum glass observation window (with lighting) 200mm*300mm
Optional	Low temperature automatic defrost (can be once per hour or use manual button to defrost), ensure it can work at low temperature for long time even the door is open and close frequently）

Ultra-low temperature refrigerator is also known as cryopreservation box, cryogenic refrigerator, cryopreservation box, cryo refrigeration and so on, the common low temperature refrigerator of which is -65 ℃ ~ -10℃.

The cryogenic systems of ultra-low temperature refrigerator basically adopts the working principle of cascade refrigeration and is equipped with two fully enclosed compressors as high and low temperature compressor. The copper tube of the low-temperature evaporator is attached directly to the outside of the inner box in the form of a coil and with heat transfer cement block between the coil and the box wall of the gap, to increase the heat exchange effect. The condensing evaporator is a shell tube structure with four tubes of the thread-shaped copper tube and a countercurrent heat exchange.

The cryogenic stage system is equipped with a gas heat exchanger to make the low-pressure gas coming out of the evaporator heat exchange with the high-pressure gas before the condenser-evaporator, which not only reduces the heat load of the condensing evaporator but also makes full use of the heat.The wax removal filter is the most common, the main purpose of the filter is to remove the paraffin from the frozen oil in order to reduce the possibility of "oil plugging" in the system.

In addition, according to different applications, ultra-low temperature refrigerator can also be equipped with some accessories. For example, take temperature re
corder for a permanent record of operating parameters; use the carbon dioxide backup system for special circumstances to ensure the gas preservation environment to maintain a normal state and choose the voltage booster for guaranteeing the normal work of the compressor under low pressure.

Contact Lneya for more.