Omega Products PRG101-25 User Manual

Measuring capsule

Control chamber

Pressure adjusting knob

Pilot pressure chamber

Pilot diaphragm

Control diaphragm

Regulated pressure

Main valve

KEYKEY

Regulated pressure

Atmospheric pressure

Pilot pressure

Unregulated pressure

Unregulated

pressure

Relief valve

Vent

Bleed orifice

Pilot valve

PRECISION PRESSURE

14 (0.55)

Inlet port

Outlet

port

Gauge port

1/4 NPT

Inlet port 1/4 NPT

Max pressure stop

locknuts

Tension nut

Bleed screw

Exhaust

11.5 (0.44) clearance required for panel mounting

54 (2.12)

68 (2.67)

44 (1.73)

REGULATORS

STANDARD HAND-WHEEL ADJUSTMENT

PRG101 Series Base Units PRG501 Series Base Units

PRG101

Models

with 4" Dia Gauge

225

⻬ Two 1⁄4 NPT Gauge

Ports Standard

⻬ High-Accuracy Regulation ⻬ High-Relief Capability ⻬ Unaffected by Vibration ⻬ Unaffected by Mounting Position ⻬ Setpoint Locknut Provided

PRG101, pressure

regulator, $225,

shown slightly

smaller than

actual size.

The PRG101 and PRG501 Series pressure regulators have an advanced design consisting of a precision measurement capsule and a high-gain servo amplifier to achieve high performance. The regulator can be used in a “dead end” application and will exhaust whenever the setpoint is lowered. Changes in supply pressure have a minimal effect on regulation accuracy. The regulator can be panel or pipe mounted. The PRG101 has 2 gauge ports available for mounting OMEGA pressure gauges for local indication. The PRG501 is ideal for dial gauge readings when the unit is panel mounted. The dial gauge is outside the panel.

Dimensions: mm (in)

OPERATION

The PRG101 and PRG501 regulators employ piston control to achieve their high-gain pneumatic 2-stage servo system. To increase the regulated pressure, the hand wheel is turned clockwise, forcing the measuring capsule/piston assembly downward.

This pushes the pilot diaphragm and control diaphragm downward. As a result, the main valve opens and the supply pressure enters the regulator. The resulting pressure change causes the measuring capsule to compress. This compression causes the pilot diaphragm and control diaphragm to move upward, which then shuts the main valve. To decrease the regulated pressure, the hand-wheel is turned counterclockwise, forcing the measuring capsule/piston assembly upward. This allows the pilot diaphragm and control diaphragm to move upward. As a result, the relief valve opens and air is exhausted through the vent. The resulting pressure drop causes the measuring capsule to expand. This expansion causes the pilot diaphragm and control diaphragm to move down, which then shuts the relief valve.

L-17

PRG101 SERIES HAND-WHEEL ADJUSTMENT

lb/in

0.2 bar

117 (4.62) DIA.

29 (1.14)

13.5 (0.53)

Fixing clamp

Air Connections 1/4 NPT

Inlet far side

Outlet near side

Panel cutout 112

108 (4.25)

PRG501 SERIES 4" DIAMETER DIAL GAUGE WITH HAND-WHEEL ADJUSTMENT

PRG501 Series

PRG501

Models

725

Maintaining a state of equilibrium, the action of the measuring capsule described on the preceding page ensures precise, constant pressure regulation. Air is bled at a constant rate through the bleed orifice so that a very small movement of the pilot valve induces a substantial pilot pressure change, which creates a high servo amplification.

SPECIFICATIONS

Maximum Supply (Input) Pressure:

150 psi (1000 kPa)

Minimum Supply (Input) Pressure:

3 psi above desired output pressure

Minimum Regulated Pressure: 2 psi Media: Dry gases only (oil free), filtered

to better than 25 microns

Flow Capacity: 10 SCFM max Consumption @ Midrange:

0.01 SCFM (PRG101-25, PRG501-15, PRG501-30)

0.02 SCFM (PRG101-60, PRG501-60)

0.04 SCFM (PRG101-120, PRG501-120)

ø = diameter

Dimensions: mm (in)

PRG501-120, dial gauge, $725, shown smaller than actual size.

Regulation Accuracy (15 psi Supply Pressure Change at Midrange):

0.1% (PRG101-25, PRG501-15, PRG501-30)

0.05% (PRG101-60, PRG501-60)

0.02% (PRG101-120, PRG501-120)

Sensitivity: 0.005 psi Hysteresis and Repeatability:

0.05% of setting Operating Temperature: -20 to 70°C

(0 to 160°F) PRG501 Dial Gauge: Dual scale, psi

and bar

Response Time to 50% Load Change: 0.2 seconds

Housing Material: IP65 sealed,

zinc diecasting, epoxy painted Diaphragm Material: Nitrile-reinforced

elastomers

Capsule Material: Beryllium-copper

Mounting: Any attitude; integral

mounting nut supplied Pressure Gauge (PRG501): Phosphor

bronze Bourdon tube

Process Connection:

(pneumatic only)

Number of Turns in Control Range:

⁄2 hand-wheel turns

Weight:

PRG101: 0.75 kg (1.60 lb) PRG501: 1.15 kg (2.50 lb)

Recommended Reference Book:

The Engineering Designs of Systems,

EE-2557, $120

Visit omega.com/bobi

for Additional Books

⁄4 FNPT