Submitted by divya on July 15, 2025

PRO-50 Instrument Supply Regulator

Outlet Pressures: 0-35 PSIG (0-2.41 BARG) / 0-60 PSIG (0-4.14 BARG) / 0-125 PSIG
(0-8.62 BARG)
Inlet Pressures: 250 PSI (17.24 BAR)
Standard Temperature Limitations: -40°F to 300°F (-40°C to 149°C)

PRO-50 Series regulators are designed to be a compact, lightweight option for providing controlled pressures to instrumentation. Generally used to constantly control supply pressure to pneumatic and electro-pneumatic instrumentation, these direct-operated regulators are rugged enough to be used in most air or gas applications.

Engineered to provide clean supply pressure to meet the accuracy, repeatability and hysteresis demands of digital instrumentation, the PRO-50 is also well suited to supply local pneumatic instrumentation.

Overview

PRO-50 Instrument Supply Regulator

MODEL:	PRO-50 / PRO-50N (NACE MR0175) PRO-NR50 (NON-RELIEVING) / PRO-NR50N (NON-RELIEVING NACE MR0175)

INLET:	250 PSIG (17.24 BARG) MAXIMUM BODY RATING

OUTPUT:	0-35 / 0-60 / 0-125 PSIG (0-2.41 / 0-4.14 / 0-8.62 BARG)

ADJUSTING SCREW:	SQUARE-ZINC PLATED / SLOTTED-STAINLESS STEEL / HANDWHEEL

DRAIN VALVE:	BRASS / STAINLESS STEEL

TEMPERATURE RANGE:	NITRILE ELASTOMERS	POLYETHYLENE FILTER - 5 MICRONS	-40°F to 180°F (-40°C to 82°C)
		STAINLESS STEEL FILTER - 40 MICRONS	-40°F to 180°F (-40°C to 82°C)
	VITON ELASTOMERS	GLASS FILTER - 5 MICRONS	0°F to 300°F (-18°C to 149°C)
		STAINLESS STEEL FILTER - 40 MICRONS	0°F to 300°F (-18°C to 149°C)

Product Specifications

Available Outlet Pressure Ranges

OUTLET PRESSURE RANGES		CONTROL SPRING DATA
OUTLET PRESSURE RANGES		COLOR	MATERIAL	PART NUMBER	WIRE DIAMETER		FREE LENGTH
PSIG	BARG	COLOR	MATERIAL	PART NUMBER	INCH	mm	INCH	mm
0 to 35	0 to 2.41	Silver	Music Wire (Standard)	PRO50601X01D	0.156	3.96	1.44	36.5
0 to 60	0 to 4.14	Blue Stripe		PRO50602X01D	0.17	4.32	1.44	36.5
0 to 125	0 to 8.62	Red Stripe		PRO50603X01D	0.207	5.26	1.44	36.5
0 to 35	0 to 2.41	Silver & Gold	Inconel® Alloy X750 (NACE)	PRO50601X02D	0.156	3.96	1.44	36.5
0 to 60	0 to 4.14	Blue & Gold		PRO50602X02D	0.17	4.32	1.44	36.5
0 to 125	0 to 8.62	Red & Gold		PRO50603X02D	0.207	5.26	1.44	36.5

Available Flow Capacities (For Air)

OUTLET PRESSURE RANGE	OUTLET PRESSURE		INLET PRESSURE		CAPACITIES
	OUTLET PRESSURE		INLET PRESSURE		10% DROOP		20% DROOP
	PSIG	BARG	PSIG	BARG	SCFH	Nm3/H	SCFH	Nm3/H
0 to 35 PSIG (0 to 2.41 BARG)	15	1.03	50	3.45	250	6.7	430	11.5
			75	5.17	300	8	690	18.5
			100	6.89	330	8.8	1,000	26.8
			150	10.34	400	10.7	1,600	42.9
			250	17.24	450	12.1	1,800	48.2
	20	1.38	50	3.45	350	9.4	500	13.4
			75	5.17	530	14.2	820	22
			100	6.89	750	20.1	1,100	29.5
			150	10.34	1,400	37.5	1,600	42.9
			250	17.24	2,550	68.3	2,700	72.4
	35	2.41	50	3.45	390	10.4	500	13.4
			75	5.17	640	17.2	820	22
			100	6.89	840	22.5	1,100	29.5
			150	10.34	1,450	38.9	1,650	42.9
			250	17.24	2,450	65.7	2,700	72.4
0 to 60 PSIG (0 to 4.14 BARG)	35	2.41	50	3.45	330	8.8	470	12.6
			75	5.17	500	13.4	730	19.6
			100	6.89	700	18.8	1,000	26.8
			150	10.34	1,050	28.1	1,550	41.5
			250	17.24	2,000	53.6	2,600	69.7
	60	4.14	75	5.17	520	13.9	720	19.3
			100	6.89	770	20.6	1,000	26.8
			150	10.34	1,100	29.5	1,600	42.9
			250	17.24	2,450	65.7	2,750	73.7
0 to 125 PSIG (0 to 8.62 BARG)	80	5.56	100	6.89	530	14.2	780	20.9
			150	10.34	780	20.9	1,200	32.2
			250	17.24	1,250	33.5	2,200	59
	125	8.62	150	10.34	900	24.1	1,150	30.8
	125	8.62	250	17.24	1,650	44.2	2,450	65.7