Sierra 730 User Manual

Page 1
Sierra Series 730 Accu-Mass
Mass Flow Meters
Instruction Manual
Part Number IM-73-AM
Revision E 05/04
5 Harris Court, Building L Monterey, CA 93940
(831) 373-0200 (800) 866-0200 Fax (831) 373-4402
Sierra Instruments b.v. Bolstoen 30A 1046 AV Amsterdam The Netherlands
+31(0)20-6145810 Fax +31(0)20-6145815
Page 2
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.
Page 3
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
Page 4
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:
Series 730 Instruction Manual
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
2 IM-73-E
Page 5
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
Page 6

Safety Information

We use caution and warning statements in this book to draw your at­tention to important information.
Series 730 Instruction Manual
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.

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 (service@sierrainstruments.com); 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:
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.
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)
4 IM-73-E
Page 7
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 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 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
Page 8
Series 730 Instruction Manual
10 D 5 D
Flow
One 90° elbow before meter
Flow meter
10 D 5 D
Flow
Reduction before meter
Flow meter
15 D 5 D
20 D 5 D
Flow
Two 90° elbows before meter in one plane
Flow meter
Flow
Expansion before meter
Flow meter
25 D 10 D
25 D 10 D
Flow
Two 90° elbows before meter out of plane (if three 90° bends present, double recommended length)
Flow meter
Flow
Regulator or valve partially closed before meter (If valve is always wide open, base length requirements on fitting directly preceding it)
Flow meter
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
Caution!
All flow meter connections
and fittings must have the
same or higher pressure
rating as the main pipeline.
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
Page 9
Series 730 Instruction Manual
Wiring Connections - NEMA 2 CE Enclosures
Warning!
All wiring procedures
must be performed
with the power Off.
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)
1 Positive power lead (Red)
1
5
2 Output signal (Wht) 3 Signal common (Blk)
6
2
4
3
Figure 3. NEMA 2 CE Enclosure Wiring Connections
4 Bridge voltage (Org Not Required) 5 Power return (Grn) 6 Shield (Not Required)
IM-73-D 7
Page 10
Caution!
Do not connect power to
the 4-20 mA terminals.
Series 730 Instruction Manual

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.
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.
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
Page 11
Series 730 Instruction Manual
Problem Possible Cause Solution
Flow measurement is erratic or fluctuating
Velocity measurement seems too high or low
No response to flow from sensor assembly
Very erratic or non-uniform flow Follow installation requirements
shown in Figure 2
Flow meter installed with less than re­quired minimum pipe diameters up­stream and downstream of the sensor
Probe is not secured to a solid base Secure probe to a non-vibrating solid
Sensor component broken Return to factory for replacement Malfunction in system
electronics Moisture present in gas flow Install a water trap or filter upstream
Sensor assembly not aligned correctly to flow
No power Turn on power to the flow meter
Flow profile distortions Try to find another location for the
Follow installation requirements shown in Figure 2
mount
Return to factory for evaluation
of the flow sensor Correct alignment with the flow indica-
tor pointing downstream in the direc­tion of flow
meter
Extremely turbulent flow Do not place the meter near a ventila-
tor, static mixer or valve Sensor failure Return to factory for repair Malfunction in system
electronics
System will not zero Out of calibration Return to factory for calibration
Probe tip is broken Return to factory for repair
4-20 mA output circuit not indicating 4 mA at zero flow
Output pegs plus or minus Flow body not plugged in Plug in both connectors
Improper current loop resistance; total current loop resistance must be no less than 150 Ohms and no greater than 450 Ohms
Malfunction in system electronics
Return to factory for evaluation
Install load resistor or use larger
gauge wire
Return to factory for evaluation
IM-73-E 9
Page 12
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:
service@sierrainstruments.com (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
Series 730 Instruction Manual
When returning a component, make sure to include the completed Calibration/Repair Data Sheet with the shipment.
10 IM-73-E
Page 13
Series 730 Instruction Manual

Product Specifications

Operating Specifications
Gases Most non-combustible, non-corrosive gases Mass Flow Rates
Mass Flow Rate for Air
NPT Size Minimum Range Maximum Range
1/4-inch 0–0.035 scfm 0–4.5 scfm 1/2-inch 0–0.5 scfm 0–12 scfm 3/4-inch 0–1 scfm 0–25 scfm
1 1/4-inch 0–2 scfm 0–50 scfm
2-inch 0–5 scfm 0–125 scfm 3-inch 0–10 scfm 0–250 scfm
(1) Contact factory for ranges of other gases
(1)
Gas Pressure 150 psig (10 barg)*
Pressure Drop Negligible
Gas & Ambient Temperature Gas.............................14° to 176°F (–10° to 80°C)
Leak Integrity 1 X 10-2 atm cc/sec of helium maximum Power Requirements 15 or 24 VDC, 300 mA Output Signal Linear 0-5 VDC or 0-10 VDC proportional to mass flow rate, 1000 Ohms
*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.
Ambient......................32° to 120°F (0° to 50°C)
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
Repeatability ± 0.2% of full scale Temperature Coefficient ± 0.02% of reading per °F within ± 50°F of customer specified conditions
Pressure Coefficient Negligible within ±50 psig (3.4 barg) of customer specified conditions
Response Time 200 milliseconds to 63% of final velocity value
psia (0.3 to 2 barg)
± 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
(Special calibration required for higher pressures)
Physical Specifications
Wetted Materials Anodized aluminum or 316 stainless steel flow body
Enclosure Anodized aluminum NEMA 2
Glass-coated sensor; epoxy; Viton O-rings
Painted cast aluminum NEMA 4
IM-73-E 11
Page 14
730/600 WIRING CONNECTIONS
No#. Color Signal 1 Black Sig. Ground 2 White Signal 3 Red DC input Power 4 N/C 5 N/C 6 Green Power Ground 7 (Brown or Orange) (Bridge)
Blue Hi Rose Connector
1
2
3
6
7
5
4
Female Mating Connector Solder Side
No#. Color Signal 1 Black Sig. Ground 2 White Signal 3 Red DC input Power 4 N/C 5 N/C 6 Green Power Ground 7 (Brown or Orange) (Bridge)
No#. Color Signal 1 Red DC input Power 2 White Signal 3 Black Sig. Ground 4 (Brown or Orange) ( B r i dg e) 5 Green Power Ground 6
1
2
3
4
5
+VDC Input Power Ground Output Signal Signal Ground
7
6
Black Connector Female Mating Connector Solder Side
5
4
3
Silver Connector
2
Female Mating Connector
6
Solder Side
1
E7 Enclosure
Red
Green
White
Black
N/C
To Sensor
Loading...