• Nickel-plated steel wetted parts for corrosion resistance.
• Circular dial is dry, 4" (100 mm) in diameter, and enclosed in a steel case for corrosion resistance.
• Measures pressure with single (psi) scale and temperature in Fahrenheit.
• Display accuracy is + or - 3/2/3% over the entire range of the gauge (ASME B40.100 Grade B).
• Lower or center back male connection with 1/4" NPT rate.

The Winters PAM series ammonia pressure gauge with nickel-plated steel wetted parts has a dry circular dial enclosed in a steel case and a male connection with 1/4" NPT rate, and measures pressure (psi) and temperature (Fahrenheit) with an accuracy of + or - 3/2/3%. The nickel-plated wetted parts and the steel case provide corrosion resistance. The case is Ingress Protection certified IP52 for protection against dust or liquids. The circular dial is dry and 4" (100 mm) in diameter. The dial has an aluminum anodized black pointer and the lens is polycarbonate for high impact resistance. The gauge measures pressure with a psi scale and temperature in Fahrenheit. The gauge is accurate to + or - 3/2/3% over the entire range of the gauge, American Society of Mechanical Engineers (ASME) B40.100 Grade B accuracy class. The male connection is ed either on the bottom or the center back of the gauge and has a 1/4" NPT (National Pipe Thread) rate. The ring for the gauge is plated steel, the bourdon tube is stainless steel 316, and the movement is stainless steel 304 for corrosion resistance. The welding is tungsten inert (TIG) for strength. The over-pressure limit is 30% of full scale value. The working pressure is a maximum of 75% of full scale value. The operating temperature is -40 to 150 degrees F (-40 to 65 degrees C). This pressure gauge is suitable for closed refrigeration systems. Pressure gauges are instruments used to measure the pressure of a or liquid inside a vessel and, often, to help ensure the optimal a of pressure for a given application. Pressure gauges can range from everyday instruments, such as those used to measure the air pressure in a car or bicycle tire, to highly accurate gauges used in mechanical and industrial processing. Most often, pressure gauges measure pressure relative to another reference. For instance, gauge pressure measures pressure relative to ambient air. An example of a pressure gauge measuring relative to ambient air is a tire pressure gauge or a blood pressure gauge. Differential pressure is the difference in pressure between two points, such as when measuring liquid flow along various points in a pipeline. An absolute pressure gauge measures pressure relative to a perfect vacuum, such as an atmospheric or barometric pressure gauge. All types of pressure gauges include either a male or a female to connect to the vessel where pressure is being measured, and display results on a dial with varying increments of measure across a given range. Winters Instruments manufactures pressure gauges, thermometers, diaphragm seals, pressure transmitters, and switches. The company, founded in 1953, is headquartered in Toronto, Canada.