Sierra Accu-Mass 730 Instruction manual

Add to my manuals
14 Pages

advertisement

Sierra Accu-Mass 730 Instruction manual | Manualzz

Sierra Series 730 Accu-Mass

Mass Flow Meters

Instruction Manual

Part Number IM-73-AM

Revision E 0 5 /0 4

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.

© COPYRIGHT SIERRA INSTRUMENTS 1994

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 manufacturers.

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

Series 730 Instruction Manual

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

IM-73-E 1

2

Series 730 Instruction Manual

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 pressure 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 damaging 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

IM-73-E

Series 730 Instruction Manual

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 noncorrosive gases compatible with the device’s wetted materials and applications 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 elements–a velocity sensor and a temperature sensor which automatically 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 measured by the bridge voltage. The meter electronics converts this voltage 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 enclosures, remotely up to 100 feet (60 meters) away.

Accu-Mass™ Sensor

Heat

Gas temperature sensor

Heated velocity sensor

Mass flow

Figure 1. Series 730 Accu-Mass Sensor Probe

IM-73-E 3

4

Series 730 Instruction Manual

Safety Information

We use caution and warning statements in this book to draw your attention to important information.

Warning!

This statement appears with information that is important to protect people and equipment from damage. Pay very close attention to all warnings that apply to your application.

Caution!

This statement appears with information that is important for protecting your equipment and performance. Read and follow all cautions 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 damaged, notify the local carrier and submit a report to the factory or distributor. Remove the packing slip and check that all ordered components 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 configuration information for each step of the installation procedure. Verify that the flow conditions are consistent with factory recommendations. Refer to Troubleshooting for specific information and recommendations.

If the problem persists after following the troubleshooting procedures outlined in this manual, contact Sierra Instruments by fax or by Email ([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 include 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)

IM-73-E

Series 730 Instruction Manual

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 diameters upstream and downstream of the sensor head (see Figure 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 between 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 disturbances in the flow profile that might cause unexpected flow rate indications

• heaters that might cause rapid excursions in the measured temperature

Unobstructed Flow Requirements

Select an installation site that will minimize possible distortion in the flow profile. Valves, elbows, control valves and other piping components 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.

IM-73-E 5

Series 730 Instruction Manual

Caution!

All flow meter connections and fittings must have the same or higher pressure rating as the main pipeline.

10 D 5 D 10 D 5 D

Flow Flow meter

Flow

Flow meter

Reduction before meter

One 90° elbow before meter

15 D 5 D

Flow

Flow meter

20 D 5 D

Flow

Flow meter

Two 90° elbows before meter in one plane

25 D 10 D

Expansion before meter

25 D 10 D

Flow

Flow meter

Flow Flow meter

Two 90° elbows before meter out of plane (if three 90° bends present, double recommended length)

Regulator or valve partially closed before meter

(If valve is always wide open, base length requirements on fitting directly preceding it)

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

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 downstream 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.

6 IM-73-E

Series 730 Instruction Manual

Warning!

All wiring procedures must be performed with the power Off.

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 1 and power ground to pin 5. See “Output Signal Wiring” for signal wiring instructions.

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

2

6

3

4

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)

Figure 3. NEMA 2 CE Enclosure Wiring Connections

IM-73-D 7

Series 730 Instruction Manual

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.

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 signal and Signal ground.

Troubleshooting the Flow Meter

Begin hardware troubleshooting by verifying the following facilities issues 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 upstream 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 meters 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.

8 IM-73-E

Series 730 Instruction Manual

Problem Possible Cause Solution

Flow measurement is erratic or fluctuating

Velocity measurement seems too high or low

Very erratic or non-uniform flow

Flow meter installed with less than required minimum pipe diameters upstream and downstream of the sensor

Probe is not secured to a solid base

Follow installation requirements shown in Figure 2

Follow installation requirements shown in Figure 2

Secure probe to a non-vibrating solid mount

Sensor component broken

Malfunction in system electronics

Moisture present in gas flow

Return to factory for replacement

Return to factory for evaluation

Install a water trap or filter upstream of the flow sensor

Sensor assembly not aligned correctly to flow

Correct alignment with the flow indicator pointing downstream in the direction of flow

No power Turn on power to the flow meter No response to flow from sensor assembly

System will not zero

4-20 mA output circuit not indicating 4 mA at zero flow

Flow profile distortions

Extremely turbulent flow

Sensor failure

Malfunction in system electronics

Try to find another location for the meter

Do not place the meter near a ventilator, static mixer or valve

Return to factory for repair

Return to factory for evaluation

Out of calibration

Probe tip is broken

Return to factory for calibration

Return to factory for repair

Improper current loop resistance; total current loop resistance must be no less than 150 Ohms and no greater than 450 Ohms

Install load resistor or use larger gauge wire

Output pegs plus or minus Flow body not plugged in

Malfunction in system electronics

Plug in both connectors

Return to factory for evaluation

IM-73-E 9

10

Series 730 Instruction Manual

Returning Equipment to Factory

Before returning any mass flow meter to the factory, you must complete a Sierra Calibration/Repair Data Sheet. You may download the data sheet to your computer by visiting the Sierra website at www.sierrainstruments.com. Or, contact Customer Service at: [email protected] (Email) or,

(800) 866-0200 or (831) 373-0200 in the US, or +31(0)20-6145810 in Europe.

Return shipments to:

USA Headquarters

Sierra Instruments Service Department

5 Harris Court, Building W

Monterey, CA 93940

European Headquarters

Sierra Instruments b.v. Service Department

Bolstoen 30A

1046 AV Amsterdam, The Netherlands

When returning a component, make sure to include the completed

Calibration/Repair Data Sheet with the shipment.

IM-73-E

Series 730 Instruction Manual

Product Specifications

Operating Specifications

Gases Most non-combustible, non-corrosive gases

Mass Flow Rates

NPT Size

1/4-inch

1/2-inch

3/4-inch

1 1/4-inch

Mass Flow Rate for Air

(1)

Minimum Range

0–0.035 scfm

0–0.5 scfm

0–1 scfm

0–2 scfm

2-inch

3-inch

0–5 scfm

0–10 scfm

(1) Contact factory for ranges of other gases

Maximum Range

0–4.5 scfm

0–12 scfm

0–25 scfm

0–50 scfm

0–125 scfm

0–250 scfm

Gas Pressure 150 psig (10 barg)*

*Maximum gas pressure is determined by the mechanical process connections, as well as, the application conditions. Mechanical limitations are shown above, please consult factory for application limitations.

Negligible Pressure Drop

Gas & Ambient Temperature Gas.............................14° to 176°F (–10° to 80°C)

Ambient......................32° to 120°F (0° to 50°C)

Leak Integrity

Power Requirements

Output Signal

1 X 10

-2

atm cc/sec of helium maximum

15 or 24 VDC, 300 mA

Linear 0-5 VDC or 0-10 VDC proportional to mass flow rate, 1000 Ohms minimum load resistance; or, linear 4-20 mA proportional to mass flow rate,

400 Ohms maximum resistance

Performance Specifications

Accuracy ± 1% of full scale + 0.5% of reading over 32 to 120°F (0 to 50°C) and 5 to 30 psia (0.3 to 2 barg)

Repeatability ± 0.2% of full scale

Temperature Coefficient

Pressure Coefficient

Response Time

± 0.02% of reading per °F within ± 50°F of customer specified conditions

± 0.03% of reading per °F within ± 50°F to 100°F of customer specified conditions

±0.04% of reading per °C within ± 25°C of customer specified conditions

±0.06% of reading per °C within ± 25°C to 50°C of customer specified conditions

Negligible within ±50 psig (3.4 barg) of customer specified conditions

(Special calibration required for higher pressures)

200 milliseconds to 63% of final velocity value

Physical Specifications

Wetted Materials Anodized aluminum or 316 stainless steel flow body

Glass-coated sensor; epoxy; Viton O-rings

Enclosure Anodized aluminum NEMA 2

Painted cast aluminum NEMA 4

IM-73-E 11

730/600 WIRING CONNECTIONS

No#. Color

1 Black

2 White

3 Red

Signal

Sig. Ground

Signal

DC input Power

4 N/C

5 N/C

6 Green Power Ground

7 (Brown or Orange) (Bridge)

2

1

3

7

6

4

5

Blue Hi Rose Connector

Female Mating Connector

Solder Side

No#. Color

1 Black

2 White

3 Red

Signal

Sig. Ground

Signal

DC input Power

4 N/C

5 N/C

6 Green Power Ground

7 (Brown or Orange) (Bridge)

2

1

3

4

7

5

6

Black Connector

Female Mating Connector

Solder Side

No#. Color

1 Red

2 White

3 Black

Signal

DC input Power

Signal

Sig. Ground

4 (Brown or Orange) ( B r i d g e )

5 Green Power Ground

6

4

5

+VDC Input

Power Ground

Output Signal

Signal Ground

3

6

1

2

Silver Connector

Female Mating Connector

Solder Side

E7

Enclosure

Red

Green

Whit e

Black

N/C

To Sensor

advertisement

Was this manual useful for you? Yes No
Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Related manuals