Salt Water Gauges | McMaster-Carr

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For Use With

Alcohol-Based Solvents

Printed Circuit Boards

Stems with Clamping Nut

Surfaces

Taps

Thermocouple Connection Heads

Acetic Acid (White Vinegar)

Argon/Carbon Dioxide Blend

Hydraulic Fluid (Petroleum Based)

Salt Water (Calcium Chloride)

Salt Water (Sodium Chloride)

Soap Solutions

Sodium Bicarbonate (Baking Soda)

Sodium Hydroxide (Caustic Soda)

Sodium Hypochlorite (Bleach)

Steam

Steel

Sugar Water (Sucrose)

Pipe Size

Dial Diameter

Connection Material

Maximum Process Temperature

Dial Type

Thread Type

Scale Type

Maximum Environment Temperature

Measures

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Fitting Connection

Measurement Unit

Kilograms per Square Centimeter

Pounds per Square Inch

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Connects To

Case Material

Material

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Graduations

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Pressure Numeric Increments

RoHS

REACH

Export Control Classification Number (ECCN)

2B999

EAR99

DFARS Specialty Metals

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72 Products

About Pipe Size

About Pressure Gauges

Bottom Connection (Flange Mount)

Lower Back Connection (Flange Mount)

Bottom Connection (Flange Mount)

Lower Back Connection (Flange Mount)

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 (psi)

For Use With: Air, Water, Hydraulic Fluid, Gasoline, Diesel Fuel, Natural Gas, Refrigerant, and Salt Water
Accuracy: ±1% Full Scale (Grade 1A)

Available Pressure Ranges
Pressure Range, psi	Graduation Marks, psi	Numeric Increments, psi
0 to 100	1	10
0 to 200	2	20
0 to 1,000	10	100
0 to 2,000	20	200
0 to 5,000	50	500

				Mounting		Bolt			Flange
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Orientation	Fasteners Included	Circle Dia.	Hole Dia.	No. of Holes	Location	OD		Each
Bottom Connection (Flange Mount)
NPT Male
4 1/2"	1/4	-65° to 400°	-65° to 600°	Upright	No	5 3/8"	7/32"	3	Back	5 13/16"	0000000	0000000
Lower Back Connection (Flange Mount)
NPT Male
4 1/2"	1/4	-65° to 400°	-65° to 600°	Upright	No	5 3/8"	7/32"	3	Back	5 13/16"	0000000	000000

Low-Pressure Gauges for Chemicals

With PVC Guard

With CPVC Guard

With Polypropylene Guard

Bottom Connection (Plastic Guard)

A plastic or stainless steel guard, also known as an isolator, protects the gauge from damage caused by corrosive chemicals. Use them with pumps, filters, regulators, and in process lines to measure and display pressures.

Polypropylene and 316 stainless steel guards are more chemical resistant than PVC and CPVC guards.

Painted Steel Case with PVC Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Bleach, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 140°	40° to 140°	Black	PVC Plastic	Gray	0000000	0000000
2"	1/2	40° to 140°	40° to 140°	Black	PVC Plastic	Gray	0000000	000000

Painted Steel Case with CPVC Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Bleach, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 190°	40° to 190°	Black	CPVC Plastic	Gray	0000000	0000000
2"	1/2	40° to 190°	40° to 190°	Black	CPVC Plastic	Gray	0000000	000000

Painted Steel Case with Polypropylene Plastic Connection—Dual Scale (psi, kg/cm²)

For Use With: Water, Salt Water, Hydraulic Fluid, Boric Acid, and Carbon Dioxide
Accuracy: ±2% Mid Scale (Grade B)

Available Pressure Ranges
Pressure Range		Graduation Marks		Numeric Increments
psi	kg/cm²	psi	kg/cm²	psi	kg/cm²
0 to 30	0 to 2.1	0.5	0.05	5	0.5
0 to 60	0 to 4.2	1	0.1	10	1
0 to 150	0 to 11.2	2	0.2	20	2

							Bottom Connection
Dial Diameter	Pipe Size	Environment Temp. Range, °F	Process Temp. Range, °F	Case Color	Guard Material	Guard Color		Each
NPT Female
2"	1/4	40° to 240°	40° to 240°	Black	Polypropylene Plastic	White	0000000	0000000

Calibration Columns

Calibrate the flow rate of metering pumps. A graduated scale with zero at the top lets you easily see how much fluid is lost over the course of a one-minute test. This will tell you your pump’s flow rate. Periodic testing helps alert you to issues in your system, such as worn or dirty valves. Checking the flow rate after performing maintenance ensures your pump is working properly.

Install the column between your reservoir and pump. They require shutoff access to your reservoir and an on/off valve (not included) at the point where they connect to your system. To start the test, open the on/off valve as the system is running to fill the column with fluid up to the zero mark. Shut off the valve and wait one minute before observing the liquid level in the column. After you've taken the reading, close the on/off valve to the column and reopen access to the reservoir.

Borosilicate glass calibration columns and their fittings stand up to sulfuric acid, hydrochloric acid, and other corrosive chemicals.

			Volume		Graduations
Pipe Connections	Ht.	Flow Rate Range, gph	gal.	ml	gph	ml/min	Temp. Range, °F	O-Ring Material	Mounting Orientation	For Use With		Each
Borosilicate Glass Body with PTFE Plastic Fittings
Gallons per Hour, Milliliters per Minute
1/2 NPT Female	13"	0 to 1.5	1.5	100	0.02	1	40° to 150°	Fluoroelastomer Rubber	Vertical	Water, Gasoline, Diesel Fuel, Kerosene, Ammonium Hydroxide, Bleach, Chlorine, Citric Acid, Deionized Water, Ethylene Glycol, Fuel Oil, Hydraulic Oil, Hydrochloric Acid, Isopropyl Alcohol, Methyl Chloride, Motor Oil, Nitric Acid, Paint, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sulfuric Acid	00000000	0000000
1/2 NPT Female	16 1/2"	0 to 4	4	250	0.05	2	40° to 150°	Fluoroelastomer Rubber	Vertical	Water, Gasoline, Diesel Fuel, Kerosene, Ammonium Hydroxide, Bleach, Chlorine, Citric Acid, Deionized Water, Ethylene Glycol, Fuel Oil, Hydraulic Oil, Hydrochloric Acid, Isopropyl Alcohol, Methyl Chloride, Motor Oil, Nitric Acid, Paint, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sulfuric Acid	00000000	000000
3/4 NPT Female	18"	0 to 8	8	500	0.05	5	40° to 150°	Fluoroelastomer Rubber	Vertical	Water, Gasoline, Diesel Fuel, Kerosene, Ammonium Hydroxide, Bleach, Chlorine, Citric Acid, Deionized Water, Ethylene Glycol, Fuel Oil, Hydraulic Oil, Hydrochloric Acid, Isopropyl Alcohol, Methyl Chloride, Motor Oil, Nitric Acid, Paint, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sulfuric Acid	00000000	000000
3/4 NPT Female	29"	0 to 16	16	1,000	0.125	5	40° to 150°	Fluoroelastomer Rubber	Vertical	Water, Gasoline, Diesel Fuel, Kerosene, Ammonium Hydroxide, Bleach, Chlorine, Citric Acid, Deionized Water, Ethylene Glycol, Fuel Oil, Hydraulic Oil, Hydrochloric Acid, Isopropyl Alcohol, Methyl Chloride, Motor Oil, Nitric Acid, Paint, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sulfuric Acid	00000000	000000
1 NPT Female	24"	0 to 32	32	2,000	0.25	10	40° to 150°	Fluoroelastomer Rubber	Vertical	Water, Gasoline, Diesel Fuel, Kerosene, Ammonium Hydroxide, Bleach, Chlorine, Citric Acid, Deionized Water, Ethylene Glycol, Fuel Oil, Hydraulic Oil, Hydrochloric Acid, Isopropyl Alcohol, Methyl Chloride, Motor Oil, Nitric Acid, Paint, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sulfuric Acid	00000000	00000000
1 NPT Female	39"	0 to 64	64	4,000	0.25	20	40° to 150°	Fluoroelastomer Rubber	Vertical	Water, Gasoline, Diesel Fuel, Kerosene, Ammonium Hydroxide, Bleach, Chlorine, Citric Acid, Deionized Water, Ethylene Glycol, Fuel Oil, Hydraulic Oil, Hydrochloric Acid, Isopropyl Alcohol, Methyl Chloride, Motor Oil, Nitric Acid, Paint, Phosphoric Acid, Salt Water, Soap Solutions, Sodium Hydroxide, Sulfuric Acid	00000000	00000000

Easy-View Oil-Level Indicators

Made with clear, shatter-resistant plastic, these indicators don't require a shield to protect them like other oil-level indicators, so you can check your hydraulic fluid or oil level from any angle. They’re often found on gear boxes, crank cases, and other reservoirs. These indicators mount from the outside of your tank. The vent prevents pressure buildup, which can affect the level displayed. Within the vent, there is a filter for keeping out particles as small as table salt. Unthread the vent to clean its filter or to replace it with your own vent, plug, fitting, or sensor. These indicators also have adjustable rings for marking levels critical to your system.

			Temp. Range, °F
Overall Ht.	Window Ht.	Max. Pressure	Min.	Max.	Fitting Material	Window Material	Features	Includes		Each
Copolyester Plastic
3/8 NPT Male Thread
3 3/4"	1 7/8"	65 psi @ 70° F	-40°	200°	Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	000000
6 3/4"	4 7/8"	65 psi @ 70° F	-40°	200°	Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
9 3/4"	7 7/8"	65 psi @ 70° F	-40°	200°	Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
12 3/4"	10 7/8"	65 psi @ 70° F	-40°	200°	Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
18 3/4"	16 7/8"	65 psi @ 70° F	-40°	200°	Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	000000
1/2 NPT Male Thread
3 13/16"	1 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
6 13/16"	4 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
9 13/16"	7 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
12 13/16"	10 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
18 13/16"	16 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	000000
3/4 NPT Male Thread
3 13/16"	1 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
6 13/16"	4 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
9 13/16"	7 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
12 13/16"	10 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	00000
18 13/16"	16 7/8"	65 psi @ 70° F	-40°	200°	304 Stainless Steel	Copolyester Plastic	3-Micron Filter, UV Resistant, Vent	Level Rings	0000000	000000

Level Indicators with Shut-Off Valve

Bronze

316 Stainless Steel and Brass With Ball-Valve-Style Drain

Shut-off valves stop flow so you can clean and replace gauge glass without removing these indicators from your equipment.

Indicators with needle stem have a stem in the lower shut-off valve to clear the orifice as the valve closes.

Indicators with automatic shut-off will temporarily close if the gauge glass breaks. The valves must be closed manually for permanent shut-off.

Level Indicators
							Temp. Range, °F						Replacement Glass
Connection Ctr.-to-Ctr.	Overall Ht.	Window Ht.	Body Wd.	Drain Cock Dia.	Max. Pressure	Max. Steam Pressure	Min.	Max.	For Use With	No. of Guard Rods		Each		Each
Bronze
3/8 NPT Male Thread with Needle Stem
11 1/4"	13 5/8"	7"	3 7/8"	7/16"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	0000000	0000000	000000
1/2 NPT Male Thread with Needle Stem
13 1/4"	15 5/8"	9"	3 15/16"	7/16"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
1/2 NPT Male Thread with Needle Stem and Automatic Shut-Off
13 1/4"	15 5/8"	9"	3 15/16"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
3/4 NPT Male Thread with Needle Stem
17 1/2"	20"	13"	4 3/16"	7/16"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
3/4 NPT Male Thread with Needle Stem and Automatic Shut-Off
17 1/2"	20"	13"	4 3/16"	7/16"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	2	0000000	000000	0000000	00000
Brass
1/2 NPT Male Thread with Ball-Valve-Style Drain and Automatic Shut-Off
14"	16 1/4"	9"	4 5/8"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000
1/2 NPT Male Thread with Ball-Valve-Style Drain
14"	16 1/4"	9"	4 5/8"	1/4"	400 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000
3/4 NPT Male Thread with Ball-Valve-Style Drain
18"	20 1/4"	13"	4 5/16"	1/4"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000
3/4 NPT Male Thread with Ball-Valve-Style Drain and Automatic Shut-Off
18"	20 1/4"	13"	4 5/16"	1/4"	370 psi @ 70° F	200 psi @ 400° F	35°	400°	Water, Hydraulic Fluid, Salt Water, Steam	4	0000000	000000	0000000	00000

Sights for Quick-Clamp Sanitary Tube Fittings

Sight Shown Assembled With Gasket,
Quick-Clamp Fitting, And Tube
Fitting (All Sold Separately)

Plastic Window with 304 Stainless Steel Ring

Glass Window with 2205 Stainless Steel Ring

Monitor food, brewery, chemical, pharmaceutical, and biotech processing lines with these sights that attach to quick-clamp fittings for fast installation and easy removal for cleaning. All have a one-piece design, so there are no crevices where bacteria can grow. A quick-clamp fitting, gasket, and tube fitting are required (sold separately).

304 stainless steel sights have a ring that's embedded around their shatter-resistant plastic window. This design protects the sights from chipping or cracking while under the stress of the quick-clamp fitting. All withstand harsh cleaners and sanitizers for clean-in-place (CIP) and steam-in-place (SIP) applications. They do not contain Bisphenol A (BPA), Bisphenol B (BPB), or BPA derivatives (BPX), which are chemicals that can contaminate your process lines. All meet ASME BPE design standards for bioprocessing equipment that ensure purity and safety.

For superior strength and reliability, choose 2205 stainless steel sights. All have a glass window that’s melted around a high-strength ring, so they won’t shatter, leak, or lose their shape under high pressure, heat, chemicals, or impact. They withstand harsh cleaners and sanitizers for clean-in-place (CIP) and steam-in-place (SIP) applications. USP Class VI and TUV Rheinland Certified, these sights meet safety standards in the U.S. and Europe. They also meet DIN standards for glass materials used in sights, ASTM standards for materials used in boilers and pressure vessels, and ASME BPE design standards for bioprocessing equipment that ensure purity and safety.

				Temp. Range, °F
For Tube OD	For Flange OD	Window Dia.	Max. Pressure	Min.	Max.	For Use With	Features	Specifications Met		Each
304 Stainless Steel Ring with Plastic Window
1"	1.98"	1 1/4"	150 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	0000000
2"	2.52"	1 3/4"	150 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	000000
4"	4.68"	3 1/4"	30 psi @ 70° F	Not Rated	200°	Water, Acetic Acid, Air, Alcohol-Based Solvents, Compressed Air, Salt Water, Steam	One-Piece Construction	ASME BPE	0000000	000000
2205 Stainless Steel Ring with Glass Window
1", 1 1/2"	1.98"	1"	230 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000
2"	2.52"	1 3/16"	230 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000
3"	3.58"	1 1/2"	150 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000
4"	4.68"	2 3/16"	150 psi @ 70° F	-40°	500°	Water, Hydraulic Fluid, Diesel Fuel, Acetic Acid, Air, Alcohol-Based Solvents, Beverage, Chemicals, Compressed Air, Food, Fuel Oil, Gasoline, Inert Gas, Ketone, Oil, Salt Water, Steam	One-Piece Construction	ASME BPE, ASTM A479, DIN 7079, DIN 7080, TUV Rheinland Certified, USP Class VI	0000000	000000

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