NOSHOK 300 Series Cast Brass Case Pressure Gauge Model 300 2 1/2 Inch Dial Size

Select A Model 300 Dial Size

25-300 2 ½ Inch	40-300 4 Inch

2 ½ Inch Dial Size
	Size & Model Number: NPT Connection Size & Type: Model Specifications: Standard Pressure Ranges: Dial Configurations: Options & Accessories: Ordering Information: Special Ordering:		25-300 1/4" NPT Brass Bottom Connection 7/16"-20 SAE (Stocked in Ranges Indicated with (*) Below) Stock Model Specifications 30 inHg Vacuum to through to 15,000 psi Single Scale psi Dual Scale psi/kPa, psi/kg/cm², psi/bar Regularly Stocked Options & Accessories Ordering Information Sheet Contact Us for Details on Custom Configurations

STANDARD PRESSURE RANGES

Single Scale Dial Units	Single Scale Options:	psi

Dual Scale Dial Units	Outer Scale Options:	psi

	Inner Scale Options:	kPa	bar	kg/cm²

Pressure Ranges	30" Vac	30 inHg Vacuum to 0 inHg*	300	0 psi to 300 psi*
	30-0-15	-30 inHg to 0 inHg psi to 15 psi¹	400	0 psi to 400 psi*
	30-0-30	-30 inHg to 0 inHg psi to 30 psi	600	0 psi to 600 psi*
	30-0-60	-30 inHg to 0 inHg psi to 60 psi¹	800	0 psi to 800 psi
	30-0-100	-30 inHg to 0 inHg psi to 100 psi¹	1,000	0 psi to 1,000 psi*
	30-0-160	-30 inHg to 0 inHg psi to 160 psi	1,500	0 psi to 1,500 psi*
	30-0-200	-30 inHg to 0 inHg psi to 200 psi¹	2,000	0 psi to 2,000 psi*
	30-0-300	-30 inHg to 0 inHg psi to 300 psi¹	3,000	0 psi to 3,000 psi*
	15	0 psi to 15 psi	5,000	0 psi to 5,000 psi*
	30	0 psi to 30 psi	6,000	0 psi to 6,000 psi*
	60	0 psi to 60 psi	7,500	0 psi to 7,500 psi
	100	0 psi to 100 psi*	10,000	0 psi to 10,000 psi
	160	0 psi to 160 psi*	15,000	0 psi to 15,000 psi
	200	0 psi to 200 psi*

* This Range is Also Available in a 7/16"-20 SAE Adustable Type Straight Thread Connection
as a Regularly Stocked Order Option

¹ This Range is Not Regularly Stocked in the kg/cm² Inner Scale Option

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STOCK MODEL SPECIFICATIONS
Dial Size	2 ½ Inch (63 mm)
Case	Die Cast Brass - Natural Brass Finish
Connection	1/4" NPT Brass Bottom Connection, Die Cast with the Case is Standard. The 7/16" -20 SAE J1926/3 Adjustable Type Straight Thread Connection is also Available from Stock. See Stock Options for Additional Connection Offerings.
Pressure Ranges	Stocked Ranges: 30 inHg Vacuum to 0 inHg -> 0 to 10,000 psi See Pressure Ranges for Specific Ranges and Dial Scale Units that are Regularly Stocked.
Cover Ring	Polished Brass
Lens	Molded Plexiglass with O-Ring Seal. Instrument Glass, Lexan, and Safety Glass Overlays are available Stock Options.
Bourdon Tube	Phosphor Bronze "C" Tube for Pressures up to 600 psi. Coiled Safety Tube Above 600 psi.
Movement	Brass and Nickel Silver with Highly Polished Bearing Surfaces
Safety Protection	Safety Relief Disc on the Top of the Case
Accuracy	±1.5% Full Scale, ASME B40.100 grade A
Pointer	Balanced Aluminum Din Pointer with Black Finish
Dial	Aluminum with White Background. UV Resistant. Single Scale psi is standard with Black Markings. Dual Scale psi/kPa, psi/kg/cm², psi/bar are Regularly Stocked and Available upon Request. Outer Scale is psi in Black and the Inner Metric Scale is Red. See Below for Stock Dial Configurations.
Fill Liquid	Glycerine and Water
OPERATING SPECIFICATIONS
Working Pressure Limitations Dynamic Pressure The working pressure should be limited to 60% of the dial range. Static Pressure The working pressure, where no sharp fluctuations occur, should be limited to 90% of the dial range. Ambient Temperature 0° F to 160° F (-18° C to 71° C) Lower operating temperatures are available to -40° F (40° C) by using a special glycerine mixture or low temperature silicone. Please Contact Us for assistance in selecting the best fill liquid for your application. Note: All NOSHOK hermetically sealed gauges with ranges of 400 psi and below, including all vacuum and compound ranges, are equipped with a vent pin in the relief disc. The vent pin should be removed after installation of the gauge to insure accurate indication.

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	SINGLE SCALE Stock Dial Configurations psi

(These are regularly stocked dial configurations. Contact Us for complete availability of Pressure Ranges and Dial Scale Units, Including Dual Scale Availability) Click on the camera to view an actual photo of the dial.

	FIGURE INTERVAL	GRADUATION INTERVAL
30 inHg Vacuum to 0 inHg	-5 inHg	-0.5 inHg
-30 inHg to 0 inHg 0 psi to 15 psi	-10 inHg 5 psi	-1 inHg 0.5 psi
-30 inHg to 0 inHg 0 psi to 30 psi	-30 inHg 10 psi	-2 inHg 1 psi
-30 inHg to 0 inHg 0 psi to 60 psi	-30 inHg 20 psi	-5 inHg 2 psi
-30 inHg to 0 inHg 0 psi to 100 psi	-30 inHg 20 psi	-5 inHg 2 psi
-30 inHg to 0 inHg 0 psi to 160 psi	-30 inHg 40 psi	-10 inHg 4 psi
-30 inHg to 0 inHg 0 psi to 200 psi	-30 inHg 20 psi	-5 inHg 4 psi
-30 inHg to 0 inHg 0 psi to 300 psi	-30 inHg 50 psi	-10 inHg 5 psi
0 psi to 15 psi	3 psi	0.2 psi
0 psi to 30 psi	5 psi	0.5 psi
0 psi to 60 psi	10 psi	1 psi
0 psi to 100 psi	20 psi	2 psi
0 psi to 160 psi	40 psi	4 psi
0 psi to 200 psi	40 psi	4 psi
0 psi to 300 psi	50 psi	5 psi
0 psi to 400 psi	100 psi	10 psi
0 psi to 600 psi	100 psi	10 psi
0 psi to 800 psi	200 psi	20 psi
0 psi to 1000 psi	200 psi	20 psi
0 psi to 1500 psi	300 psi	20 psi
0 psi to 2000 psi	400 psi	40 psi
0 psi to 3000 psi	500 psi	50 psi
0 psi to 5000 psi	1000 psi	100 psi
0 psi to 6000 psi	1000 psi	100 psi
0 psi to 7500 psi	1500 psi	100 psi
0 psi to 10000 psi	2000 psi	200 psi
0 psi to 15000 psi	3000 psi	200 psi

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	DUAL SCALE Stock Dial Configurations Outer Scale psi Inner Scale kPa

(These are regularly stocked dial configurations. Contact Us for complete availability of Pressure Ranges and Dial Scale Units) Click on the camera to view an actual photo of the dial.

	FIGURE INTERVAL	GRADUATION INTERVAL
-30 inHg to 0 inHg (-100) kPa to 0 kPa	-5 inHg -20 kPa	-0.5 inHg -2 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 15 psi 0 kPa to 100 kPa	-10 inHg -50 kPa 5 psi 50 kPa	-1 inHg -5 kPa 0.5 psi 5 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 30 psi 0 kPa to 200 kPa	-30 inHg -100 kPa 10 psi 100 kPa	-2 inHg -10 kPa 1 psi 10 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 60 psi 0 kPa to 400 kPa	-30 inHg -100 kPa 20 psi 100 kPa	-2 inHg -5 kPa 2 psi 20 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 100 psi 0 kPa to 680 kPa	-30 inHg -100 kPa 20 psi 200 kPa	-5 inHg -20 kPa 2 psi 20 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 160 psi 0 kPa to 1100 kPa	-30 inHg -100 kPa 40 psi 400 kPa	-10 inHg -50 kPa 4 psi 40 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 200 psi 0 kPa to 1350 kPa	-30 inHg -100 kPa 40 psi 400 kPa	-10 inHg -50 kPa 4 psi 40 kPa
-30 inHg to 0 inHg (-100) kPa to 0 kPa 0 psi to 300 psi 0 kPa to 2,000 kPa	-30 inHg -100 kPa 50 psi 500 kPa	-10 inHg -50 kPa 5 psi 50 kPa
0 psi to 15 psi 0 kPa to 102 kPa	3 psi 30 kPa	0.2 psi 2 kPa
0 psi to 30 psi 0 kPa to 205 kPa	5 psi 50 kPa	0.5 psi 5 kPa
0 psi to 60 psi 0 kPa to 410 kPa	10 psi 100 kPa	1 psi 10 kPa
0 psi to 100 psi 0 kPa to 680 kPa	20 psi 200 kPa	2 psi 20 kPa
0 psi to 160 psi 0 kPa to 1100 kPa	40 psi 200 kPa	4 psi 50 kPa
0 psi to 200 psi 0 kPa to 1360 kPa	40 psi 400 kPa	4 psi 40 kPa
0 psi to 300 psi 0 kPa to 2050 kPa	50 psi 500 kPa	5 psi 50 kPa
0 psi to 400 psi 0 kPa to 2700 kPa	100 psi 1000 kPa	10 psi 100 kPa
0 psi to 600 psi 0 kPa to 4100 kPa	100 psi 1000 kPa	10 psi 100 kPa
0 psi to 800 psi 0 kPa to 5500 kPa	200 psi 1000 kPa	20 psi 100 kPa
0 psi to 1000 psi 0 kPa to 6800 kPa	200 psi 2000 kPa	20 psi 200 kPa
0 psi to 1500 psi 0 kPa to 10200 kPa	300 psi 3000 kPa	20 psi 200 kPa
0 psi to 2000 psi 0 kPa to 13600 kPa	400 psi 4000 kPa	40 psi 400 kPa
0 psi to 3000 psi 0 kPa to 20500 kPa	500 psi 5000 kPa	50 psi 500 kPa
0 psi to 5000 psi 0 kPa to 34000 kPa	1000 psi 10000 kPa	100 psi 1000 kPa
0 psi to 6000 psi 0 kPa to 41000 kPa	1000 psi 10000 kPa	100 psi 1000 kPa
0 psi to 7500 psi 0 kPa to 51000 kPa	1500 psi 10000 kPa	100 psi 1000 kPa
0 psi to 10000 psi 0 kPa to 68000 kPa	2000 psi 20000 kPa	200 psi 2000 kPa
0 psi to 15000 psi 0 kPa to 102000 kPa	3000 psi 30000 kPa	200 psi 2000 kPa

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	DUAL SCALE Stock Dial Configurations Outer Scale psi Inner Scale kg/cm²

(These are regularly stocked dial configurations. Contact Us for complete availability of Pressure Ranges and Dial Scale Units) Click on the camera to view an actual photo of the dial.

	FIGURE INTERVAL	GRADUATION INTERVAL
-30 inHg to 0 inHg (-1.02) kg/cm² to 0 kg/cm²	-5 psi -0.2 kg/cm²	-0.5 psi -0.02 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 15 psi 0 to 1.05 kg/cm²	-10 inHg -0.5 kg/cm² 5 psi 0.5 kg/cm²	-1 inHg -0.05 kg/cm² 1 psi 0.05 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 30 psi 0 to 2.1 kg/cm²	-30 inHg -1 kg/cm² 10 psi 1 kg/cm²	-2 inHg -0.1 kg/cm² 1 psi 0.1 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 60 psi 0 to 4.2 kg/cm²	-30 inHg -1 kg/cm² 20 psi 2 kg/cm²	-5 inHg -0.2 kg/cm² 2 psi 0.2 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 100 psi 0 to 7 kg/cm²	-30 inHg -1 kg/cm² 20 psi 2 kg/cm²	-5 inHg -0.2 kg/cm² 2 psi 0.2 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 160 psi 0 to 11.2 kg/cm²	-30 inHg -1 kg/cm² 40 psi 4 kg/cm²	-10 inHg -0.5 kg/cm² 20 psi 0.4 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 200 psi 0 to 14 kg/cm²	-30 inHg -1 kg/cm² 40 psi 4 kg/cm²	-10 inHg -0.5 kg/cm² 4 psi 0.4 kg/cm²
-30 inHg to 0 inHg -1 kg/cm² to 0 kg/cm² 0 psi to 300 psi 0 to 21 kg/cm²	-30 inHg -1 kg/cm² 50 psi 5 kg/cm²	-10 inHg -0.5 kg/cm² 5 psi 0.5 kg/cm²
0 psi to 15 psi 0 kg/cm² to 1.04 kg/cm²	3 psi 0.3 kg/cm²	0.2 psi 0.02 kg/cm²
0 psi to 30 psi 0 kg/cm² to 2.1 kg/cm²	5 psi 0.5 kg/cm²	0.5 psi 0.05 kg/cm²
0 psi to 60 psi 0 kg/cm² to 4.2 kg/cm²	10 psi 1 kg/cm²	1 psi 0.1 kg/cm²
0 psi to 100 psi 0 kg/cm² to 7 kg/cm²	20 psi 2 kg/cm²	2 psi 0.2 kg/cm²
0 psi to 160 psi 0 kg/cm² to 11.2 kg/cm²	40 psi 2 kg/cm²	4 psi 0.5 kg/cm²
0 psi to 200 psi 0 kg/cm² to 14 kg/cm²	40 psi 4 kg/cm²	4 psi 0.4 kg/cm²
0 psi to 300 psi 0 kg/cm² to 21 kg/cm²	50 psi 5 kg/cm²	5 psi 0.5 kg/cm²
0 psi to 400 psi 0 kg/cm² to 28 kg/cm²	100 psi 2 kg/cm²	10 psi 0.5 kg/cm²
0 psi to 600 psi 0 kg/cm² to 42 kg/cm²	100 psi 10 kg/cm²	10 psi 1 kg/cm²
0 psi to 800 psi 0 kg/cm² to 42 kg/cm²	100 psi 10 kg/cm²	10 psi 1 kg/cm²
0 psi to 1000 psi 0 kg/cm² to 70 kg/cm²	200 psi 20 kg/cm²	20 psi 2 kg/cm²
0 psi to 1500 psi 0 kg/cm² to 104 kg/cm²	300 psi 30 kg/cm²	20 psi 2 kg/cm²
0 psi to 2000 psi 0 kg/cm² to 140 kg/cm²	400 psi 40 kg/cm²	40 psi 4 kg/cm²
0 psi to 3000 psi 0 kg/cm² to 210 kg/cm²	500 psi 50 kg/cm²	50 psi 5 kg/cm²
0 psi to 5000 psi 0 kg/cm² to 350 kg/cm²	1000 psi 100 kg/cm²	100 psi 10 kg/cm²
0 psi to 6000 psi 0 kg/cm² to 420 kg/cm²	1000 psi 100 kg/cm²	100 psi 10 kg/cm²
0 psi to 7500 psi 0 kg/cm² to 520 kg/cm²	1500 psi 100 kg/cm²	100 psi 10 kg/cm²
0 psi to 6000 psi 0 kg/cm² to 420 kg/cm²	1000 psi 100 kg/cm²	100 psi 10 kg/cm²
0 psi to 10000 psi 0 kg/cm² to 700 kg/cm²	2000 psi 200 kg/cm²	200 psi 20 kg/cm²
0 psi to 15000 psi 0 kg/cm² to 1040 kg/cm²	3000 psi 300 kg/cm²	200 psi 20 kg/cm²

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	DUAL SCALE Stock Dial Configurations Outer Scale psi Inner Scale bar

(These are regularly stocked dial configurations. Contact Us for complete availability of Pressure Ranges and Dial Scale Units) Click on the camera to view an actual photo of the dial.

	FIGURE INTERVAL	GRADUATION INTERVAL
-30 inHg to 0 inHg (-1) bar to 0 bar	-5 inHg 0.2 bar	-.5 inHg 0.02 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 15 psi 0 bar to 1 bar	-10 inHg -0.5 bar 5 psi 0.5 bar	-1 inHg -0.05 bar 0.5 psi 0.05 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 30 psi 0 bar to 2 bar	-30 inHg -1 bar 10 psi 1 bar	-2 inHg -0.1 bar 1 psi 0.1 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 60 psi 0 bar to 4 bar	-30 inHg -1 bar 20 psi 2 bar	-5 inHg -0.2 bar 2 psi 0.2 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 100 psi 0 bar to 6.8 bar	-30 inHg -1 bar 20 psi 2 bar	-5 inHg -0.2 bar 2 psi 0.2 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 160 psi 0 bar to 10.8 bar	-30 inHg -1 bar 40 psi 4 bar	-10 inHg -0.5 bar 4 psi 0.4 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 200 psi 0 bar to 13.6 bar	-30 inHg -1 bar 40 psi 4 bar	-10 inHg -0.5 bar 4 psi 0.4 bar
-30 inHg to 0 inHg (-1) bar to 0 bar 0 psi to 300 psi 0 bar to 20.5 bar	-30 inHg -1 bar 50 psi 5 bar	-10 inHg -0.5 bar 5 psi 0.5 bar
0 psi to 15 psi 0 bar to 1.02 bar	3 psi 0.3 bar	0.2 psi 0.02 bar
0 psi to 30 psi 0 bar to 2.05 bar	5 psi 0.5 bar	0.5 psi 0.05 bar
0 psi to 60 psi 0 bar to 4.10 bar	10 psi 1 bar	1 psi 0.1 bar
0 psi to 100 psi 0 bar to 6.8 bar	20 psi 2 bar	2 psi 0.2 bar
0 psi to 160 psi 0 bar to 11 bar	40 psi 2 bar	4 psi 0.5 bar
0 psi to 200 psi 0 bar to 13.6 bar	40 psi 4 bar	4 psi 0.4 bar
0 psi to 300 psi 0 bar to 20.5 bar	50 psi 5 bar	5 psi 0.5 bar
0 psi to 400 psi 0 bar to 27.0 bar	100 psi 2 bar	10 psi 0.5 bar
0 psi to 600 psi 0 bar to 41.0 bar	100 psi 10 bar	10 psi 1 bar
0 psi to 800 psi 0 bar to 41.0 bar	100 psi 10 bar	10 psi 1 bar
0 psi to 1000 psi 0 bar to 68 bar	200 psi 20 bar	20 psi 2 bar
0 psi to 1500 psi 0 bar to 102 bar	300 psi 30 bar	20 psi 2 bar
0 psi to 2000 psi 0 bar to 136 bar	400 psi 40 bar	40 psi 4 bar
0 psi to 3000 psi 0 bar to 205 bar	500 psi 50 bar	50 psi 5 bar
0 psi to 5000 psi 0 bar to 340 bar	1000 psi 100 bar	100 psi 10 bar
0 psi to 6000 psi 0 bar to 410 bar	1000 psi 100 bar	100 psi 10 bar
0 psi to 7500 psi 0 bar to 510 bar	1500 psi 100 bar	100 psi 10 bar
0 psi to 10000 psi 0 bar to 680 bar	2000 psi 200 bar	200 psi 20 bar
0 psi to 15000 psi 0 bar to 1020 bar	3000 psi 300 bar	200 psi 20 bar

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Regularly Stocked Options & Accessories

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Contact Us for Details on Custom Configurations.

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