Sierra Accu-Mass 730 Manual de usuario

Sierra Series 730 Accu-Mass™

Mass Flow Meters

Instruction Manual

Part Number IM-73-AM

Revision E05/04

5 Harris Court, Building L Monterey, CA 93940

(831) 373-0200 (800) 866-0200 Fax (831) 373-4402

http://www.sierrainstruments.com

Sierra Instruments b.v. Bolstoen 30A 1046 AV Amsterdam The Netherlands

+31(0)20-6145810 Fax +31(0)20-6145815

Customer Notice

Sierra Instruments, Inc. is not liable for any damage or personal injury, whatsoever,

resulting from the use of Sierra Instruments standard mass flow meters for oxygen

gas. You are responsible for determining if this mass flow meter is appropriate for

your oxygen application. You are responsible for cleaning the mass flow meter to

the degree required for your oxygen flow application.

No part of this publication may be copied or distributed, transmitted, transcribed, stored in

a retrieval system, or translated into any human or computer language, in any form or by

any means, electronic, mechanical, manual, or otherwise, or disclosed to third parties

without the express written permission of Sierra Instruments. The information contained in

this manual is subject to change without notice.

TRADEMARKS

Accu-Mass™ is a trademark of Sierra Instruments, Inc. Other product and company

names listed in this manual are trademarks or trade names of their respective manufac-

turers.

Revision D: added NEMA 4 enclosure wiring instructions, updated content and format.

Series 730 Instruction Manual

IM-73-E1

Table of Contents

Series 730 Mass Flow Meters...........................................................3

Safety Information..........................................................................4

Receipt of Components...................................................................4

Technical Assistance.......................................................................4

Installation Overview......................................................................5

Unobstructed Flow Requirements...............................................5

Installation......................................................................................6

Wiring Connections - NEMA 2 Enclosures......................................7

Wiring Connections - NEMA 4 Enclosures......................................7

Output Signal Wiring.......................................................................8

Troubleshooting the Flow Meter......................................................8

Returning Equipment to the Factory..............................................10

Product Specifications...................................................................11

Figures

1. Series 730 Sensor Assembly......................................................3

2. Recommended Pipe Length Requirements................................6

3. NEMA 2 Wiring Connections..................................................7

4. NEMA 4 Wiring Connections..................................................7

Series 730 Instruction Manual

2IM-73-E

Warnings and Cautions

Warning! All wiring procedures must be performed with the power Off.

Caution! All flow meter connections and fittings must have the same or higher pres-

sure rating as the main pipeline.

Caution! Do not connect power to the 4-20 mA terminals.

Caution! Before attempting any flow meter repair, verify that the line is de-pressurized.

Caution!

Always remove main power before disassembling any part of the flow meter.

Caution! Printed circuit boards are sensitive to electrostatic discharge. To avoid dam-

aging the board, follow these precautions to minimize the risk of damage:

• before handling the assembly, discharge your body by touching a grounded,

metal object

• handle all cards by their edges unless otherwise required

• when possible, use grounded electrostatic discharge wrist straps when handling

sensitive components

Series 730 Instruction Manual

IM-73-E3

Series 730 Mass Flow Meters

Sierra’s Series 730 Accu-Mass™Flow Meters provide outstanding

measurement accuracy and fast 200 millisecond response time. The

meters monitor the mass flow rate of air and process gases in ranges

from 0 to 250 scfm. They are available in pipe sizes from 1/4-inch to

3 inches. Accu-mass meters are ideal for monitoring flows of non-

corrosive gases compatible with the device’s wetted materials and ap-

plications requiring fast time response.

Sierra’s Accu-Mass sensor is a reference-grade platinum resistance

temperature detector (RTD) encapsulated in glass. The platinum RTD

wire is wound on a rugged ceramic mandrel for strength and stability.

The sensor is located at the tip of a 304 stainless steel probe which is

inserted in the gas stream. The sensor consists of two sensing ele-

ments–a velocity sensor and a temperature sensor which automati-

cally corrects for changes in gas temperature. When power is applied

to the flow meter, the transducer electronics heats the velocity sensor

to a constant temperature differential above the gas temperature. The

cooling effect of the air as it passes over the heated sensor is meas-

ured by the bridge voltage. The meter electronics converts this volt-

age into a linear 0-5 VDC, 0-10 VDC, or 4-20 mA output signal.

The meter electronics are packaged in an anodized aluminum NEMA

2 or a painted cast aluminum NEMA 4 enclosure. The electronics are

mounted either directly on the sensing probe or for NEMA 2 enclo-

sures, remotely up to 100 feet (60 meters) away.

Gas temperature sensor

Heat

Heated velocity sensor

Accu-Mass™ Sensor

Mass flow

Figure 1. Series 730 Accu-Mass Sensor Probe

Series 730 Instruction Manual

4IM-73-E

Safety Information

We use caution and warning statements in this book to draw your at-

tention to important information.

Warning! Caution!

This statement appears with information that is

important to protect people and equipment from

damage. Pay very close attention to all warn-

ings that apply to your application.

This statement appears with information that

is important for protecting your equipment

and performance. Read and follow all cau-

tions that apply to your application.

Receipt of Components

When receiving a Sierra mass flow meter, carefully check the outside

packing carton for damage incurred in shipment. If the carton is dam-

aged, notify the local carrier and submit a report to the factory or dis-

tributor. Remove the packing slip and check that all ordered compo-

nents are present. Make sure any spare parts or accessories are not

discarded with the packing material. Do not return any equipment to

the factory without first contacting Sierra Customer Service.

Technical Assistance

If you encounter a problem with the flow meter, review the configura-

tion information for each step of the installation procedure. Verify

that the flow conditions are consistent with factory recommenda-

tions. Refer to Troubleshooting for specific information and recom-

mendations.

If the problem persists after following the troubleshooting procedures

outlined in this manual, contact Sierra Instruments by fax or by E-

mail ([email protected]); or, visit the Sierra website at

www.sierrainstruments.com for further assistance. For phone support

you may call (800) 866-0200 or (831) 373-0200 between 8:00 a.m.

and 5:00 p.m. PST. In Europe contact Sierra Instruments b.v. at +31

20 6145810. When contacting Technical Support, make sure to in-

clude this information:

• the flow range, serial number, Sierra order number and model

number (all marked on the meter nameplate)

• the problem you are encountering and any corrective action taken

• application information (gas, pressure, temperature and piping

configuration)

Series 730 Instruction Manual

IM-73-E5

Installation Overview

When selecting an installation site, make sure that:

1. Line pressure and temperature will not exceed the flow meter

rating. Temperature should not vary more than 120°F (50°C)

from the calibration temperature. Line pressure should not

vary more than 50 psi (3.4 bar) around the calibrated pressure.

2. The ambient temperature falls within the limits of: 32°F (0°C)

to 120°F (50°C).

3. The location meets the required minimum number of pipe di-

ameters upstream and downstream of the sensor head (see Fig-

ure 2).

4. Safe and convenient access with adequate clearance. Also,

verify the meter is located where the gas is clean and dry and

the meter is calibrated for the gas to be measured.

5. For remote installations, verify the supplied cable length is

sufficient to connect the flow meter sensor to the remote

electronics. (Do not extend or shorten the supplied cable be-

tween the probe and the electronics.)

Also, before installation check your flow system for anomalies such as:

• leaks

• valves or restrictions in the flow path that could create distur-

bances in the flow profile that might cause unexpected flow rate

indications

• heaters that might cause rapid excursions in the measured tem-

perature

Unobstructed Flow Requirements

Select an installation site that will minimize possible distortion in the

flow profile. Valves, elbows, control valves and other piping compo-

nents may cause flow disturbances. In order to achieve accurate and

repeatable performance install the flow meter using the recommended

number of straight run pipe diameters upstream and downstream of

the sensor given in Figure 2.

Series 730 Instruction Manual

6IM-73-E

Flow meter

10 D 5 D

One 90° elbow before meter

Flow meter

15 D 5 D

Two 90° elbows before

meter in one plane

Flow meter

25 D 10 D

Two 90° elbows before meter out

of plane (if three 90° bends present,

double recommended length)

Flow meter

10 D 5 D

Reduction before meter

Flow meter

20 D 5 D

Expansion before meter

Regulator or valve partially closed before meter

(If valve is always wide open, base length

requirements on fitting directly preceding it)

Flow meter

25 D 10 D

D = number of diameters of straight pipe required between the disturbance and

the flow meter (upstream); and, number of diameters of straight pipe required

downstream of the flow meter

Flow

Figure 2. Recommended Pipe Length Requirements for Installation

Installation

The following instructions are general in nature and intended for

guideline purposes only.

1. Turn off the flow of process gas. Verify that the line is not

pressurized.

2. Confirm that the installation site meets the minimum upstream

and downstream piping requirements.

3. Position the meter with the flow direction arrow pointing down-

stream in the direction of flow.

4. Tighten fittings until leak tight (refer to published standards for

specific recommendation).

5. Check the system’s entire flow path thoroughly for leaks.

Caution!

All flow meter connections

and fittings must have the

same or higher pressure

rating as the main pipeline.

Series 730 Instruction Manual

IM-73-D 7

Wiring Connections - NEMA 2 CE Enclosures

NEMA 2 enclosures are supplied with a 6-pin connector for direct

connection to the supplied mating connector. The pin designations

are given in Figure 3 below. Connect 15 VDC input power (300 mA

load, maximum) to pin 1and power ground to pin 5. See “Output Sig-

nal Wiring” for signal wiring instructions.

Figure 3. NEMA 2 CE Enclosure Wiring Connections

Warning!

All wiring procedures

must be performed

with the power Off.

•Female Cable Socket Mating Connector (Female Solder Side View)

1 Positive power lead (Red)

2 Output signal (Wht)

3 Signal common (Blk)

4 Bridge voltage (Org Not Required)

5 Power return (Grn)

6 Shield (Not Required)

Series 730 Instruction Manual

8IM-73-E

Output Signal Wiring

All flow meters are equipped with either a calibrated 0–5 VDC, 0–10

VDC or 4–20 mA output signal. These linear output signals represent

0 to 100% of the flow meter user full scale.

DC Output Wiring

The 0-5 VDC or 0-10 VDC output signal can drive a minimum load of

1000 Ohms. For 0-5 VDC or 0-10 VDC connections, connect to the

terminals marked Output signal and Signal ground.

4–20 mA Output Wiring

The 4-20 mA current loop output is self-powered (non-isolated).

The maximum loop resistance (load) for the output is 400 Ohms. For

a 4–20 mA connection, connect to the terminals marked Output sig-

nal and Signal ground.

Troubleshooting the Flow Meter

Begin hardware troubleshooting by verifying the following facilities is-

sues are correct. These areas impact system operation and must be

corrected prior to performing any flow meter inspections.

1. Verify the incoming power to the flow meter is present and of the

correct voltage and polarity.

2. Check the flow meter wiring for correct connections.

3. Verify the flow meter is installed with the correct number of up-

stream and downstream pipe diameters as shown in Figure 2.

4. Verify the flow direction indicator is correctly aligned pointing

downstream of flow.

5. Make sure there are no leaks in the line being measured.

After verifying the factors above, follow the troubleshooting procedures

outlined on the next page. If you need to return the flow meter to the

factory, see page 10 for return shipping instructions.

Flow Meter Calibration

Sierra Instruments maintains a fully-equipped calibration laboratory.

All measuring and test equipment used in the calibration of Sierra me-

ters are traceable to NIST standards. Sierra is ISO-9001 registered and

conforms to the requirements of ANSI/NCSL-Z540 and ISO/IEC

Guide 25. If the flow body or electronics have been damaged or you

simply want to have the flow meter re-calibrated, contact the factory

for return shipping instructions. Calibration must be performed by

qualified personnel using NIST-traceable equipment.

Caution!

Do not connect power to

the 4-20 mA terminals.

Caution!

Before attempting any flow

meter repair, verify that the

line is not pressurized.

Caution!

Always remove main power

before disassembling any

part of the mass flow meter.

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