"Can you provide any suggestions on which type of single-point automatic grease lubricator is most suitable for the higher ambient temperature (up to 55 degrees Celsius) and dusty (desert) outdoor conditions in remote areas? What are the advantages and disadvantages of gas? Spring-loaded automatic grease lubricator? Which types can be used in explosion-proof and hazardous locations?"

Single-point lubricators have many advantages, such as the ability to lubricate in remote or restricted access locations, reduce labor costs associated with the use of grease guns, allow continuous or regular supply of lubricating oil within a few months, reduce grease consumption and improve machine reliability sex.

These lubricators are usually used to lubricate bearings, but oil can also be used if the device is turned upside down. They are the first choice in applications where temperature changes and vibration are limited.

The body of a spring-loaded lubricator is usually made of polycarbonate, with temperatures up to 250 degrees Fahrenheit, or borosilicate, with temperatures up to 450 degrees Fahrenheit. The discharge can accept different orifice sizes to control the grease flow. The volume is usually 2 to 18 ounces (60 to 532 cc), and the pressure is 2 to 65 psi (0.14 to 4.48 bar). These devices can be refilled with grease guns.

The gas-activated lubricator has a low-pressure displacement (2-3 psi), which may not be enough to overcome line resistance. Also, remember that hydrogen is flammable and easily leaks. Most of these lubricators have a size of 4 to 16 ounces, and some can be temporarily disabled.

When using a positive displacement lubricator, the pump or piston can control the flow of grease or oil independently of resistance. These reusable systems run on AC or battery power and have a transparent water tank. Many have multipoint capabilities. The discharge pressure can be as high as 900 psi. Some devices are also approved for use in hazardous locations. Although these types of lubricators can provide a more precise amount of lubricant than other technologies when temperature changes or when different grease consistency is used, there is a risk of overlubrication. They are not sensitive to environmental temperature changes or vibrations. 

For these applications, positive displacement lubricators may be the best choice because they are less sensitive to changes in grease consistency and pumpability because the pump maintains volume control. For dusty environments, you can consider using cartridge systems to minimize the lubricant's contact with the environment during refilling. Explosion-proof models can also be used for this type of lubricator.