OxySense 300446-501 Manual de usuario

OxySense

Flow Meter

Users Guide

OxySense

An Industrial Physics Product Integrity Brand

68 Branum Road, Devens, MA 01434. USA

Phone: (978) 772-0970

Website: www.oxysense.com

Email: [email protected]

Technical Support email: [email protected]

Document Revised: July, 2020

Information in this document is subject to change without notice. Any reference to a company or

data used as examples herein is ctitious unless otherwise noted. No part of this document may

be reproduced or transmitted in any form or by any means for any purpose without express

written permission.

All other company and product names are the trademarks or registered trademarks

of their respective companies.

Flow Meter User’s Guide

Page i

Document Revised: July, 2020

Information in this document is subject to change without notice. Any reference to a

company or data used as examples in this document may not be used for any purpose

without express written permission is prohibited. All other company and product

names are the trademarks or registered trademarks of their respective companies.

Always follow all local and national safety guidelines and any additional safety

guidelines specific to your organization. Consult with your organization’s safety officer

prior to performing work.

Any descriptions of standards, protocols, practices, or procedures are given as

guidance and may not fully align with the standards, protocols, practices, or

procedures of your organization’s quality assurance program. Consult with your

organization’s quality assurance officer prior to beginning work.

Flow Meter User’s Guide

Page ii

Table of Contents

1.0 Introduction ................................................................................... 1

2.0 Flow Meter Assembly ...................................................................... 2

2.1 Assembly Components........................................................................2

2.2 Flow Meter..........................................................................................2

2.3 Tube Fittings ......................................................................................3

3.0 Instructions.................................................................................... 4

4.0 Considerations................................................................................ 8

4.1 Flow Rate............................................................................................8

4.2 Using Pure Oxygen .............................................................................8

5.0 Technical Support........................................................................... 9

List of Figures

Figure 2-1: Flow Meter Assembly (Side View).............................................................. 2

Figure 2-2: Flow Meter (Front View) ........................................................................... 2

Figure 2-3: Tube Compression Fittings ...................................................................... 3

Flow Meter User’s Guide

Page 1 of 9

1.0 Introduction

A flow meter is used to control the flow rate of gas. We typically express the flow rate

as a volume:time ratio (e.g. standard cubic feet per hour or SCFH), meaning that over

a certain period of time, a certain amount of gas will have flowed.

Industrial Physics Product Integrity provides a flow meter for use with the

OxySense® Permeation Chamber, an accessory designed for polymer film oxygen

transmission rate (OTR) analysis. The reason being: polymer films are flexible.

When using the permeation chamber, the chamber is purged with an inert gas. If

the gas flows in to the chamber too quickly, the chamber will become pressurized,

and, subsequently, the film inside may flex, bow, distort or rupture. The use of a

flow meter is needed to prevent such things from happening.

This guide will discuss the following topics:

•Connecting the flow meter to the permeation chamber

•Purging the permeation chamber

•Suggested flow rates

•Using pure oxygen

Flow Meter User’s Guide

Page 2 of 9

2.0 Flow Meter Assembly

2.1 Assembly Components

The flow meter assembly

(OxySense P/N: 300446-

501) is composed of a flow

meter, a wooden base,

gas-tight tube

compression fittings, and

a brass check valve. The

flow meter inlet is

connected to a gas source

(e.g. a compressed

nitrogen cylinder). The

outlet is connected to the

permeation chamber. The

flow of gas is regulated by

the adjustment knob on

the flow meter.

Gas Out

Flow Meter

Check Valve

Adjustment

Knob

Gas In

Figure 2-1: Flow Meter Assembly (Side View)

2.2 Flow Meter

1.0

Adjustment

Knob

Flow Level

Indicator

Figure 2-2: Flow Meter (Front View)

The flow meter (rotameter) contains a floating level

indicator that tells you the current gas flow rate.

The flow rate reading is read from the level

indicator’s metallic, horizontal line. To increase or

decrease the flow rate, turn the adjustment knob

anti-clockwise or clockwise, respectively.

It is important to note that the markings on the

flow meter are printed in increments of tenths of

standard cubic feet per hour (SCFH). The highest

marking is 1.0 SCFH and the lowest marking is 0.1

SCFH. You may convert this reading to liters per

minute (LPM) by multiplying the SCFH value by

0.5 as 1 SCFH ≈0.5 LPM.

LPM = SCFH × 0.5

Flow Meter User’s Guide

Page 3 of 9

2.3 Tube Fittings

Outlet Compression Nut

The flow meter assembly is shipped with gas-

tight compression fittings located at the inlet

and outlet. The fittings accommodate 1/4

inch (6 mm) outer diameter (O.D.) tubing.

Tubing should be composed of a non-reactive

material such as stainless steel or nylon.

⁄2”

Inlet Compression Nut & Ferrule

Note that the provided compression nuts are

different in design. The 9/16 in. (14.5 mm)

nut at the inlet includes a front ferrule and

back bushing. The 1/2 in. (13 mm) nut at the

outlet includes a joined ferrule.

⁄16”

Figure 2-3: Tube Compression Fittings

Flow Meter User’s Guide

Page 4 of 9

3.0 Instructions

Step 1: Connect tubing to the flow meter’s inlet and outlet with the provided

gas-tight compression fittings. Insert tubing through nuts and ferrules

(tubing is not provided). Firmly tighten fittings by turning clockwise

using the appropriate size wrenches.

Check Valve

Outlet

Inlet

Outlet

Compression

Nut

Inlet

Compression

Nut & Ferrule

Gas Tubin

Step 2: Ensure that the main valve on the gas cylinder is closed at this time and

that the appropriate 2-stage gas regulator is firmly attached to the tank.

Connect tubing from the flow meter inlet to the regulator. Use gas-tight

compression fittings (tubing and fittings for regulator connection are not

included).

2-Stage Regulator

Gas Tubing

Gas-Tight Fittings

Inlet

Flow Meter User’s Guide

Page 5 of 9

Step 3: Open the check valve on the

flow meter by turning

clockwise.

Step 4: Open the main valve on the

gas cylinder to begin the flow

of gas. Set the regulator

pressure to 20 psig (140

kpag).

Step 6: Close the check valve on the

flow meter by turning anti-

clockwise.

Step 5: Set the flow rate to 0.1 SCFH

(0.05 LPM) by rotating the

adjustment knob either

clockwise or anti-clockwise.

1.0

0.1 SCFH

Flow Meter User’s Guide

Page 6 of 9

Step 7: Connect the flow meter outlet to the desired inlet on the permeation

chamber. If purging the top of the chamber with pure nitrogen, connect

to the top inlet. If purging the bottom of the chamber with pure oxygen,

connect to the bottom inlet (See Section 4.2 Using Pure Oxygen).

Flow Meter

Out

Permeation Chamber

op Inlet

Step 8: Fully open both the inlet and

outlet valves on the

permeation chamber by

turning the valves anti-

clockwise.

Step 9: To begin the flow of gas

through the permeation

chamber, open the check

valve on the flow meter by

turning clockwise.

Flow Meter User’s Guide

Page 7 of 9

Step 10: If purging the top of the

chamber, allow the gas to

flow for at least 60 seconds.

If purging the bottom of the

chamber, allow the gas to

flow for at least 4 minutes.

Step 11: After purging is complete,

close the permeation

chamber inlet and then the

outlet valve by turning

clockwise. You must close

the inlet first, otherwise you

will pressurize the chamber

and cause damage to the

film.

Top:

60 secs.

Close First

Close Second

Bottom:

4 mins.

Step 12: Close the check valve on the

flow meter by turning anti-

clockwise.

Step 13: Close the main valve on the

gas cylinder.

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