Refrigeration Gauges | McMaster-Carr

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Yes

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2B999

EAR99

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32 Products

Digital Refrigerant Pressure Testing and Charging Manifolds

Monitor refrigerant pressure on an LCD when servicing air conditioning systems. This manifold automatically calculates how much refrigerant is needed in a system based on measurements taken with its thermocouples.

				Display
	For Refrigerant No.	Valve Material	Pipe Size	Type	Size	Batteries Included		Each
Three-Valve Manifold



		R-12, R-134A, R-22, R-404A, R-407C, R-410A, R-502	Brass	1/4 NPT × 1/4 NPT × 1/4 NPT	Digital	5"	Yes	1873K72	0000000

Refrigerant Pressure Testing and Charging Manifolds


Two Valve	Four Valve

Monitor refrigerant pressure with analog gauges when servicing air conditioning systems. All manifolds have double O-ring piston valves.

Sight Glass—Manifolds with sight glass allow you to view liquid levels.

			Hose
	For Refrigerant No.	Valve Material	Connection	Lg., ft.	Dia.	Gauge Color	Includes		Each
Two-Valve Manifold



		R-134A, R-404A, R-407C	Aluminum	1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°)	5	3 1/8"	Blue, Red	Sight Glass	1873K32	0000000


		R-134A	Brass	1/2"-16 × Acme 7/16"-20 UNF 7/16"-20 UNF	6	2 1/2"	Blue, Red	—	1873K24	000000
		R-22, R-404A, R-410A	Aluminum	1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°)	5	3 1/8"	Blue, Red	Sight Glass	1873K29	000000
		R-410A	Brass	1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°)	5	2 1/2"	Blue, Red	—	1873K79	000000


		Four-Valve Manifold



				R-134A, R-404A, R-407C	Aluminum	1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 3/8 UN/UNF (SAE 45°)	5	3 1/8"	Blue, Red	Sight Glass	1873K35	000000


				R-22, R-404A, R-410A	Aluminum	1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 1/4 UN/UNF (SAE 45°) × 3/8 UN/UNF (SAE 45°)	5	3 1/8"	Blue, Red	Sight Glass	1873K33	000000

Accessories and Replacements for Refrigerant Pressure Testing Manifolds

Replacement Pressure Gauges

Image of Product. Front orientation. Pressure Gauges. Refrigerant Pressure Testing and Charging Manifolds.

For Refrigerant No.	Gauge Dia.	Gauge Lens Material	Choose a Gauge Color		Each
R-134A	2 1/2"	Plastic	Blue, Red	1873K96	000000
R-134A, R-404A, R-407C	3 1/8"	Plastic	Blue, Red	1873K92	00000
R-404A, R-22, R-410A	3 1/8"	Plastic	Blue, Red	1873K89	00000
R-410A	2 1/2"	Plastic	Blue, Red	1873K93	00000

Gauge Guards

Gauge guards include one blue and one red gauge cover. They are not for use with the manifolds for R-410A refrigerant.

For Manifold Type	Includes		Each
Four Valve, Two Valve	One Blue Cover, One Red Cover	1873K81	000000

Extreme-Vibration-Resistant Pressure Gauges

Unlike other gauges that have multiple moving parts that can shake loose, these have only one internal part. They are the most shock-resistant gauges we offer and allow for precise readings in high-vibration applications. Use them with pumps, filters, regulators, and in process lines to measure and display pressure. Gauges meet MIL-G-18997 for resistance to salt spray and washdown environments. They have a safety case that blows out in the back under excess pressure, protecting the operator in front. Mount them with the dial face upright.

Aluminum Case with 316 Stainless Steel Connection—Single Scale (Pounds per Square Inch)


Bottom Connection (Flange Mount)	Lower-Back Connection (Flange Mount)	Bottom Connection (Flange Mount)	Lower-Back Connection (Flange Mount)

			Temp. Range, ° F				Bolt			Flange						Bottom Connection (Flange Mount)		Lower-Back Connection (Flange Mount)
	Dial Dia.	Pipe Size	Environment	Process	Mounting Fasteners Included	Features	Circle Dia.	Hole Dia.	No. of Holes	Location	OD	For Use With	Accuracy	Environment	Choose a Pressure Range		Each		Each
Upright Mount







				NPT Male

				4 1/2"	1/4	-65 to 400	-65 to 600	No	Safety Case	5 3/8"	7/32"	3	Back	5 13/16"	Air Diesel Fuel Gasoline Hydraulic Fluid Natural Gas Refrigerant Salt Water Water	±1% Full Scale (Grade 1A)	Washdown	0 to 100 psi; 0 to 200 psi; 0 to 1,000 psi; 0 to 2,000 psi; 0 to 5,000 psi	9918T21	0000000	9918T22	0000000

Gauge Guards

Also known as isolators or diaphragm seals, these protect gauges from corrosive process media. Fill guards with hydraulic oil (not included) before use.

316 Stainless Steel Body

316 stainless steel guards provide excellent corrosion and chemical resistance and can handle higher temperatures and pressures than plastic guards.

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	1 3/4"	3882K51	0000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	1 3/4"	3882K52	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	1 1/2"	3882K53	000000

316 Stainless Steel Body with 1/4 NPT Female Drain Port

Image of Product. Front orientation. 316 Stainless Steel Body. Gauge Guards, 1/4 NPT Female Drain Port.

316 stainless steel guards provide excellent corrosion and chemical resistance and can handle higher temperatures and pressures than plastic guards.

Guards with drain port allow you to remove process media.

Pipe Connections
Inlet	Outlet	Gasket Material	For Use With	Min. Pressure, psi	Max. Pressure @ Temp.	Max. Temp., ° F	Ht.		Each
1/4 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	2"	3882K54	0000000
1/2 NPT Female	1/4 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	2"	3882K55	000000
1/2 NPT Female	1/2 NPT Female	316 Stainless Steel	Acetylene, Air, Ammonia, Argon, Boric Acid, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Ethyl Alcohol, Gasoline, Hydraulic Fluid, Hydraulic Oil, Hydrogen, Liquid Nitrogen, Mineral Oil, Natural Gas, Nitrogen, Oxygen, Refrigerant, Salt Water, Sodium Hypochlorite (Bleach), Steam, Water	60	2,500 psi @ 72° F	300	2"	3882K56	000000

Refrigeration Pressure and Vacuum Gauges


	Bottom Connection

Often used with chillers and in refrigeration systems, these gauges display the temperature of ammonia relative to the pressure measurement. Also known as compound gauges, these measure both pressure and vacuum.

													Bottom Connection
	Dial Dia.	Pipe Size	Environment Temp. Range, ° F	Process Temp. Range, ° F	Lens Material	Pressure, psi	Vacuum, in. Hg	Graduations	Pressure Numeric Increments	Display Temp. Range, ° F	For Use With	Accuracy		Each
304 Stainless Steel Case with 316 Stainless Steel Connection—Dual Scale (Fahrenheit Scale, Inches of Mercury, Pounds per Square Inch)







				NPT Male

				2 1/2"	1/4	-40 to 200	-40 to 250	Polycarbonate	0 to 150	0 to 30	5 in. Hg, 5 psi	30 in. Hg, 20 psi	-60 to 84	Air, Ammonia, Refrigerant	±1.6% Full Scale (Grade B)	3967K31	000000


				2 1/2"	1/4	-40 to 200	-40 to 250	Polycarbonate	0 to 300	0 to 30	5 in. Hg, 5 psi	30 in. Hg, 25 psi	-60 to 125	Air, Ammonia, Refrigerant	±1.6% Full Scale (Grade B)	3967K33	00000
				4"	1/4	-40 to 200	-40 to 250	Polycarbonate	0 to 150	0 to 30	5 in. Hg, 5 psi	30 in. Hg, 20 psi	-60 to 84	Air, Ammonia, Refrigerant	±1.6% Full Scale (Grade B)	3967K32	00000
				4"	1/4	-40 to 200	-40 to 250	Polycarbonate	0 to 300	0 to 30	5 in. Hg, 5 psi	30 in. Hg, 25 psi	-60 to 125	Air, Ammonia, Refrigerant	±1.6% Full Scale (Grade B)	3967K34	00000