MFG-Series
MEMS Mass Flow Meters
SIARGO MEMS FLOW SENSOR PRODUCTS
User Manual
(VC.2)
© 2013 Siargo Ltd.
MEMS Mass Flow Meters
MFG Series
User Manual
Document No.
Issue date:
Revision:
07-2013-1 EN
2013.07
C.2
Siargo Ltd.
2041 Mission College Boulevard
Suite 250
Santa Clara, CA 95054
USA
Tel: +1(408)969.0368
Email: info@siargo.com
© Copyright 2013 by Siargo Ltd.
Siargo Ltd. and its subsidiaries reserve the rights to change the specifications and/or
descriptions without prior notice. For further information and updates, please visit:
www.Siargo.com
Mass Flow Meter User Manual
Usage
This product is designed for industrial gas mass flow metering and control.
The safety rating of the product is Ex ia IIC T4. All standard explosive gas
handling procedures must be observed for safety during installation and
meter usage.
This product is powered with lithium ion battery as a standalone unit. When
connecting the RS485 communication port with external power, electrical
wire and installation with the intrinsic device safety procedure must be
observed.
The operational conditions of the product are described by its specifications
in this manual. Please make sure each of the specifications is fully
understood, and acquire the full knowledge of the field where the product
will be installed. Please consult the manufacturer before applying it in other
working conditions, otherwise the product may not function properly or
would be damaged or cause other irreversible consequences.
Before operation, leakage test must be performed after installation for safety
assurance.
All local regulatory requirements must be observed and verified for
additional safety precautions.
The product performance requires pre-calibration that would best be applied
to the specified conditions. Use of the product in other conditions may lead
to unexpected results or even to unrecoverable damages.
Operation, installation, storage, and maintenance of the product must strictly
follow the instructions of this user manual. It is highly recommended that the
maintenance should be performed by skilled personnel or trained operators.
Unpredicted consequences may otherwise be caused. All the installation,
storage, and maintenance of the product must be handled by qualified
operators. This user manual should be placed near the product for easy
access.
Before using the product, the user should read this user manual carefully and
completely.
It is recommended that the product should be re-calibrated and maintained
in every two years or at a time period if deemed necessary.
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Mass Flow Meter User Manual
Cautions
1. Do not apply this products to any gas medium that contains excessive
liquid or solid debris, that may lead to malfunction or unrecoverable
damage of the product.
2. Do not change any software and hardware of the product. All software
and hardware of the product have been certified at the time of
manufacture.
3. Do not use any unit of the product if suspect of malfunction.
4. Do not use this product in any excessive radiation or vibration
environment.
5. Only qualified or accredited personnel by Siargo can perform repair
services. Siargo shall not be liable to any products that have be altered
or damaged before shipping for product verification and services.
6. When communicating with the meter via the communication port, such
as download the historical data from the meter, it is highly recommended
to use the software provided by manufacturer or the communication
coding should be done by referring the requirements of the user interface
described in this manual.
7. The product body is made of aluminum alloy, do not hammer or use sharp
tooling during installation.
8. The meter connection are threaded with M-thread and opted with BSPT
connectors, please make sure the pipe connectors have the same thread.
Force connection would cause unpredicted damage and/or irrecoverable
malfunction.
9. The battery pack should not be combined with arbitrary lithium ion
battery on market. Consult manufacturer for battery requirements or
obtain the replacement from manufacturer.
10. Read the manual carefully before processing of any maintenance or
troubleshooting.
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Mass Flow Meter User Manual
Table of Content
Usage
Cautions
Introduction
Working principle
Description
Dimensions
Product selection
Package description
Installation
Specifications
Meter function
LCD display
Connection
Data communications
RS485
Pulse output
4~20mA output
Automatic data record
Safety
Maintenance
Troubleshooting
Storage
Warranty
Service and order
1
2
4
5
5
6
7
7
8
9
11
11
11
12
12
12
13
13
14
14
15
15
16
17
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Mass Flow Meter User Manual
Introduction
The MFG series gas flow meters are specially designed for gas mass flow applications. Based on
Siargo's proprietary MEMS flow sensing technology and control circuit technology, the all electronic
meters are powered by battery and offer a wide dynamic range while maintaining the high sensitivity
at the low flow for gas monitor and measurement. The MEMS flow sensors provide direct mass flow
capability without additional temperature and pressure compensation. The sensors are packaged
using the boundary layer technology that ensures a time-averaged velocity profile across the sensor.
The sensing elements are at the center of the flow channel that is designed as a Venturi
configuration. The boundary layer condition would force the flow to redistribute at the sensor
assembly forming a laminar flow that make it possible for applications in gases with a proper
calibration and circuitry compensation.
The meters have industrial standard RS485 Modbus communication interface that is ready for remote
data logging or networking. The enhanced data safety is realized via the storage designed in the
control circuitry that allows the user to program the records of the flow status that can be
transmitted via the network or downloaded with a handheld or personal computer with the
manufacturer provided software.
The meters are best for clean and dry gas flow measurement in gas mass flow applications. Other
gases such as water gas with excessive moisture may cause instability due to water condensation.
The meters also come with options for GPRS data transmission, pre-paid IC card reader attachment
with a shut-off valve. Other convenient features include compact in size for logistic and well isolated
standalone unit for reduction of external manipulations.
· Wide dynamic range with integrated silicon MEMS flow sensors
· Direct measurement of mass flow without additional temperature and pressure
compensation
· Battery powered standalone unit with long battery life
· High accuracy and repeatability at full dynamic range
· Standard RS485 Modbus interface for remote data logging or networking
· Additional flow status records in circuitry for data safety
· Optional GPRS data transmission accessories or pre-paid IC card function
· Compact size for easy installation and transportation
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Mass Flow Meter User Manual
Working principle
Flow direction
Time-averaged velocity profile boundary layer
Turbulent
Free stream
Laminar
Sensor
The MEMS flow sensor senses flow by the calorimetric thermal mass flow measurement principle. A microheater is placed at the middle of two temperature sensors symmetrically placed at upstream and downstream.
The cavity below the micro-heater and sensors plays the role of thermal isolation as it is filled with the gas. When
the flow passes through the micro-heater, heat will be carried away by the flow medium, and the temperature
differences measured by the up- and down-stream temperature sensors are directly proportional to the mass
flow of the flow medium. By calibration at the standard conditions, the flow data at the sensor can be properly
registered. Compared to the traditional thermal mass flow sensing configuration, the MEMS sensor can be
packaged into a plate as indicated by the above graph. The sensor assembly is then placed into the flow channel
and the plate assembly serves as the additional flow condition from the boundary layer configuration resulting in
a laminar flow. Accurate flow rate is obtained by calibration with the standard gas at the predetermined
conditions.
Description
The meter components are show in the following graph:
User interface
C
Display:
Instant flow
Accumulated flow
Battery status
Ambient temperature
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Mass Flow Meter User Manual
Dimensions
Flow Meters
D
H
G
K
B
L
With BSPT connectors
F
H1
A
C
L1
F
A
C
L1
H1
440
132
440
137
600
162
660
172
L2
H2
ФD1
n-ФL
ФK
386
160
Ф115
4-Ф14
Ф80
396
187
Ф165
4-Ф18
Ф125
543
217
Ф200
8-Ф18
Ф160
577
222
Ф200
8-Ф18
Ф160
With flanges
K
H2
ФD 1
n -ФL
L2
Notes:
1 . Each flow meter has two connectors and the total length is L + C * 2.
2 . For MF65GD and MF80GD, the connector with rectifier should be installed at the entrance.
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Mass Flow Meter User Manual
Product selection
MF
G
-
-
-
Gas (A - air; C - CO2; N - N2; O - O2; R - Ar;
for other gases, please contact Siargo.)
Output** (N- No output; A - 4~20 mA; B-RS485; D-pulse / 0 ~ 5 V;
Options: N, A, B, D, AB, AD, BD, ABD for external power model;
N for Li-Ion battery model.)
Connection (M - M thread; R - With BSPT connectors; F - With Flanges)
Maximum flow rate* (Nm3/hr. see detailed in specifications)
Power supply (D - 3.6Vdc Li-Ion battery, e - 8~24Vdc external power supply)
DN (Pipe inner diameter, mm. Options: 32, 50, 65, 80)
Package description
Upon unpacking the product, the followings should be intact from the shipping container:
1) This product
2) Cable
3) User Manual
4) QC document or product certificate
the product physical integrity should be inspected to ensure no visual damage can be observed. If any items
as listed above are missing or any physical damages are observed.
Please contact the manufacturer and/or the shipping agents to place a return/exchange or to identify the cause
during the transit. If you are uncertain of the installation or have any questions about the shipment, please also
contact the manufacturer or the shipping agents before further process.
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Mass Flow Meter User Manual
Installation
Cautions
1. The meter can be either installed horizontally or perpendicularly. A horizontal installation is recommended
for easier meter reading.
2. After the installation pipe on the flow channel is prepared, make sure there is no any metal particles or other
harmful debris present inside the flow channel. Avoid strong vibration sources, fire sources, direct expose to
rain, or sun, or other sources that may lead to safety issues.
3. Ensure the product is free of visible damages. And check the status of meter power, make sure there is no
abnormal in display or other indications.
4. Engage the meter with the prepared installation pipe, make sure the thread or flange can properly seal. Check
the meter position and make sure there is no twists or other mechanical faults.
5. The flow measurement direction marked on the meter should be aligned with the flow direction in the flow
channel.
6. It is recommended that a high efficient filter should be installed before the meter.
7. To ensure the proper operation of the meter, make sure that there is no presence of foreign gases other than
the designated ones.
8. The meter should be installed avoiding valves, sharp turns and other obstacles possibly presented in the
The following graphs show the installation configuration. If there is requirement of different pipe size at either
upstream or downstream, the size of the pipe diameters should be larger than that of the selected meters.
A filter is necessary to avoid heavy particles or debris entering into the meter which may have impact to the
meter performance.
Filter
Pipe before
meter
Flow meter
Pipe after
meter
Flow direction
3DN
5DN
Graphic illustration for the installation.
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Mass Flow Meter User Manual
Specifications
Model
DN (mm)
MF32GD
32
10, 16 or 25
0.25
MF50GD
50
40 or 65
0.65
MF65GD
65
100
1.0
MF80GD
80
160
1.6
MF32Ge
32
80
1.6
MF50Ge
50
200
4.0
MF65Ge
65
320
6.4
MF80Ge
80
500
10.0
3
3
Max. Flow rate (Nm /h) Min. Flow rate (Nm /h)
±(1.5+0.5FS)%
Accuracy
Turn-down Ratio
100:1(MF-GD) / 50:1(MF-Ge)
0.5 MPa
Max. Working Pressure
Environment Temperature
-20 ~ +60℃
Medium Temperature
-10 ~ +55℃
Humidity
Power Supply
< 95%RH (No icing or condensation)
3.6V battery (L3638A)(MF-GD) / 8~24Vdc (Model MF-Ge)
Battery life
Real time clock life
36 months
Output
RS485, Pulse; 4~20mA
Flowrate; Accumulated flowrate; Battery status
LCD display
Calibration
10 years
Air @ 20℃,101.325kPa
Mechanical
M-Thread (BSPT-Thread or flange with Mechanical connector)
Protection
IP66
Ex Proof
Ex ia IIC T4 (MF-GD) / None (MF-Ge)
Notes:
1. Standard conditions: 20°C; 101,325 kPa
2. Humidity: flow medium must not have condensation or icing.
For other configurations, please contact the manufacturer. We can offer customized products from
pipe diameter 3/4” and above but not larger than 4” for this series of products.
For the communication mode, if no external power sources, the battery may be degraded fast. For
battery information, please contact manufacturer or its representatives.
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Mass Flow Meter User Manual
Data storage
1. The meter can record and store up to 1000 items daily
2. The time interval of the data storage can be programmed (minimal 3 min and max 240 min.) The storage
information include time (hh:mm month day year); flow rate and accumulated flow rate. The maximum
items that can be stored are 2000 entries.
3. The other stored items (max 1000) include over flow limit alarm, power failure and sensor errors)
Error function
Pressure loss
10.0
Error (%)
8.0
350
Pressure Loss (Pa)
300
6.0
4.0
MF32G
MF50G
MF65G
MF80G
250
2.0
200
0.0
-2.0
0
10
20
30
40
50
60
70
80
90
100
150
-4.0
100
-6.0
50
-8.0
-10.0
0
%Qmax
0
10
20
30
40
50
60
70
80
90 100
%Qmax
o
(at 20 C; 101.325kPa)
o
(at 20 C, 101.325kPa, low flow models)
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Mass Flow Meter User Manual
Meter Functions
1. LCD display
C
For the meters that is battery powered, it is suggested that the LCD display should be the
major interface to access the meter reading if no external power supply will be provided for
data communication. The LCD display shows accumulated flow (centered, large characters,
in Nm3, and can be displayed from 0.000 to 99999999.999 Nm3 ), instant flow is shown in
Nm3/h, and can be displayed from 0.000 to max flow in the corresponding models. The
displayed temperature is a ambient temperature.
C
The standard conditions at calibration are 20°C and 101.325kPa.
In case that the meter is malfunctioning due to sensor damage, the “E1” error sign will
be shown and flash.
C
In case that the meter is out of battery (battery power model), the battery sign will
indicate an empty battery and an error sign “E5” will be shown and flash.
Other alarm code E2~E4 :
E2
E3
E4
Sensor covered with excessive foreign materials
Hardware error
Over flow range
2. Electrical connection
Color
Definition
Description
Red
Power+
Black
GND
Green
RS485-A
RS485 A (+)
Brown
RS485-B
RS485 B (-)
Orange
Pulse output
White
Pulse GND
Blue
Loop+
4-20mA output
Purple
Loop-
4-20mA GND
12-24Vdc supply
Power ground
Pulse output for total
Pulse GND
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Mass Flow Meter User Manual
3. Data communications
3-1. RS485
The meter has an RS485 communication port. It is recommended that when this communication port is
enabled, an external power supply should be used to ensure the battery life.
or purposes of computer control and networking, the RS485 is used for communication with the following
preferred settings:
Baud rate (Bits per second): 9600
Date bits: 8
Stop bits: 1
Parity: None
Flow control: None
At the communication
:
1. Send 0x9d to the sensor and return with 0x9d
2. Send 0x54 to the sensor and return with 0x54
The interval time between two bytes sent to the sensor must be longer than 5ms. The meter will be
communicating at which the data from the sensor will be sent via RS485 in an interval of one second.
The data are in the following format:
where V=vvvv
F=ffffff
A=aaaaaaaa
V=vvvv\nF=ffffff\nA=aaaaaaaa\nT=t\n;\n
Voltage code;
mass flow rate (Equal to fff.fff Nm3/h)
Accumulated flow (Equal to aaaaa.aaa Nm3)
Returning back to normal operation:
1. Send 0x9d to the sensor and return with 0x9d;
2. Send 0x00 to the sensor and return with 0x00;
The interval time between two bytes sent to the sensor must be longer than 5ms. Then the meter will be at
normal operation at which the data will not be sent via RS232 but display via LCD.
3-2. Pulse output
The meter supply pulse output in form of even square wave. The even square wave is composed of 5 V signal
high and 0V signal low, and every pulse equal to 1Nm3, 0.1Nm3, 0.01Nm3, 0.001Nm3 or 0.0001Nm3. (default is
1Nm3)
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Mass Flow Meter User Manual
3-3. 4~20mA Connection (External Power Model)
4~20mA Output( LOOP +, Blue )
Input: 24VDC
Output: 4~20 mA
3
(4mA = 0 Nm /h; 20 mA = Max. Flow)
The connection of the loop load resistor is illustrated at the graph:
4~20mA GND ( LOOP -, Purple)
R L(max)=450Ω
3-4. Automatic data record
The meter can automatically record mass flow rate, accumulated flow rate and time. To retrieve these data,
please contact manufacturer for the necessary user interface software. The data storage interval can be
customized and please contact manufacturer for further information.
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Mass Flow Meter User Manual
Safety
Wetted materials and compatibility
The meter body is made of stainless steel and cast aluminum alloy. Sensors comprise of silicon, silicon nitride
and silicon dioxide and the sensor surfaces are passivated with silicon nitride and silicon dioxide. The electronic
sealing is provided by RTV (room temperature vulcanizing) silicone sealant WR-7 of HOCH3 (SiO) nCH3H.
Safety precautions
The product is designed for use with clean and dry gas mass flow applications. Although it may be able to apply
for other gases, the product cannot be used for gas metrology of fluoride or fluoride containing gases. For
updates of the product certification information, please contact manufacturer or visit www.Siargo.com.
Use for other gases such as extreme corrosive and toxic may cause the product malfunctioning or even severe
damages. The product sealing is ensured to work under working pressure as indicated on the product tag.
Although it has been undergone leakage proof before the shipment, cautions and further leakage test are
extremely important at installation since any leakage could cause severe safety issue.
Attention: any alternation and/or improper use of the product without the permission of the manufacturer can
cause unpredicted damages and even injuries or other severe situations. Siargo or any of its employees,
subsidiaries shall not be hold and indemnified against such consequences due to such circumstances via
improper use of the product.
Maintenance
Calibration
The meter at the time of shipping is fully calibrated at the conditions indicated on the product tag. Use of the
product under other conditions will lead to unpredictable results. Please contact the manufacture before such
applications.
To ensure the meter performance, the meter should be calibrated not over 24 months under normal operation
conditions.
Maintenance
Attention: without prior permission of the manufacturer, please do not attempt to alter any parts of the
product as it may cause unrecoverable damages. If there are questions or doubts, please contact manufacturer
immediately before further actions. Please ensure the DC power is off before disassembling the meter.
All maintenance of the meters should be done by trained and certified personnel by Siargo Ltd.
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Mass Flow Meter User Manual
Troubleshooting
Errors
Possible causes
Actions
No display
1. Wrong wire connection
2. LCD malfunction
1. Follow user manual, reconnect the wires
2. Check the LCD connection, otherwise replace
Display nonzero while no gas
flow in the pipe
1. Valve may not be closed completely
2. Pipe leakage
1. Check valve and perform leak tests
2. Check meter offset
No flow reading
1. Power supply error
2. Sensor damaged
1. Check power source
2. Check sensor error code, replace sensor
Flow rate drops
1. Flow channel clogging
2. Foreign materials deposit on sensor
1. Check and/or change pipe filter
2. Clean or change sensor
Communication malfunction
1. Wrong wire connection
2. Wrong baud rate
3. Pin contact error
1. Check wire connections
2. Check baud rate settings
3. Check hardware connections/contacts
Battery empty
1. Over lifetime, check current
1. Change battery, check internal battery circuitry
No pulse output
1. Wrong wire connection
1. Reconnect the wires
For other errors or additional information, please contact the manufacturer.
Storage
Storage
The products if not being installed upon receiving, should be stored in an area without the presence of strong
chemicals, electromagnetic interference and vibration. The environments should be dry (<95%RH) and the
temperature should be in the range of -25 to 80°C.
Transportation
During transportation, the products should be properly packaged if not being placed in their original package
containers. Such package should be able to resist vibration. Expose to rain or chemicals are strictly prohibited.
Labels such as “handle with care”, “avoid collision” should be applied or otherwise clearly marked.
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Mass Flow Meter User Manual
Warranty
(Effective September 2005)
Siargo warrants the products sold hereunder, properly used and properly installed under normal
circumstances and service as described in the user's manual, shall be free from faulty materials or
workmanship for 180 days for OEM products, and 365 days for non-OEM products from the date of
shipment. This warranty period is inclusive of any statutory warranty. Any repair or replacement serviced
product shall bear the same terms in this warranty.
Siargo makes no other warranty, expressed or implied and assumes no liability for any special or incidental
damage or charges, including but not limited to any damages or charges due to installation, dismantling,
reinstallation or any other consequential or indirect damages of any kind. To the extent permitted by Law,
the exclusive remedy of the user or purchaser, and the limit of Siargo’s liability for any and all losses,
injuries or damages concerning the products including claims based on contract, negligence, tort, strictly
liability or otherwise shall be the return of products to Siargo, and upon verification by Siargo to prove to
be defective, at its sole option, to refund, repair or replacement of the products. No Action, regardless of
form, may be brought against Siargo more than 365 days after a cause of action has accrued. The products
returned under warranty to Siargo shall be at user or purchaser's risk of loss, and will be returned, if at all,
at Siargo’s risk of loss.
Purchasers or users are deemed to have accepted this limitation of warranty and liability, which contains
the complete and exclusive limited warranty of Siargo, and it shall not be amended, modified or its terms
waived except by Siargo’s sole action.
This warranty is subject to the following exclusions:
1. Products that have been altered, modified or have been subject to unusual physical or electrical
circumstances indicated but not limited to those stated in the user’s manual or any other actions which
cannot be deemed as proper use of the products
2. Siargo does not provide any warranty on finished goods manufactured by others. Only the original
manufacturer's warranty applies.
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Mass Flow Meter User Manual
Services and order
Siargo Ltd. is making every effort to ensure the quality of the products. In case of questions, and or
product supports, please contact customer service at the address listed below. We will respond
your request in a timely fashion and will work with you toward your complete satisfaction.
Customer service and all orders should be addressed to
Siargo Ltd.
2041 Mission College Boulevard, Suite 250
Santa Clara, California 95054.
Tel:
01-(408)969-0368
Email:
info@Siargo.com.
For orders, please provide accurate and full post address. Siargo will not ship to P.O. Boxes or via a
third party.
For further information and updates, please visit www.Siargo.com.
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