Siargo MF5700 Series User manual

Gas Mass Flow Meter VC.2
Model MF570
0

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Gas Mass Flow Meter
with MEMS thermal sensing technology
MF5700 Series
User Manual
Document No. 07-2021-MF2 EN
Issue date: 2021.07
Revision: VC.2
Siargo Ltd.
3100 De La Cruz Boulevard, Suite 210
Santa Clara, CA 95054
USA
Tel: [phone]
Email: [email protected]om
© Copyright 2021 by Siargo Ltd.
Siargo Ltd. and its subsidiaries reserve the right to change the specifications and/or descriptions
without prior notice. For further information and updates, please visit: www.Siargo.com

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Attention !
Use with caution !
Please carefully read this manual prior to operating this product.
Do not open or modify any hardware which may lead to irrecoverable
damage.
Do not use this product if you suspect any malfunctions or defection.
Do not use this product for corrosive media or in a strong vibration
environment.
Use this product according to the specified parameters.
Only the trained or qualified personnel shall be allowed to perform
product services.
Be cautious for the electrical safety, even it operates at a low voltage,
any electrical shock might lead to some unexpected damages.
The gas to be measured should be clean and free of particles. Do not apply
this meter for liquid medium.
Do not apply for any unknown or non-specified gases that may
damage the product.
For wireless data with NB-IoT, please be sure the network is available.

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Table of Contents
1. Overview .................................................................................................. 5
2. Receipt / unpack of the products ................................................................ 6
3. Knowing the products ............................................................................... 7
3.1 Product description ................................................................................................. 7
3.2 LCD description ....................................................................................................... 8
3.3 Power and data cable description ............................................................................. 9
3.4 Mechanical dimensions ............................................................................................ 9
4. Installation .............................................................................................. 11
5. Operation and MENU description .............................................................. 14
5.1 Check the product specifications ............................................................................ 14
5.2 Check the leakage ................................................................................................. 14
5.3 Power the meter and digital data connection .......................................................... 14
5.4 Wireless data communication ................................................................................ 15
5.5 Meter MENU description ........................................................................................ 15
5.5.1 Starting the measurement ........................................................................................... 16
5.5.2 MENU entry with a verified password ........................................................................... 16
5.5.3 Set the RS485 Modbus address .................................................................................... 17
5.5.4 Set the RS485 communication baud rate ...................................................................... 17
5.5.5 Reset or calibrate the offset ......................................................................................... 17
5.5.6 Gas conversion factor (GCF) for different gas measurement ............................................ 18
5.5.7 Select the display mode ............................................................................................... 18
5.5.8 Select the display language ......................................................................................... 19
5.5.9 Open/close the valve ................................................................................................... 19
5.5.10 Set an alarm: upper instant flow rate limit .................................................................... 19
5.5.11 Set an alarm: lower instant flow rate limit .................................................................... 20
5.5.12 Set an alarm: accumulated flow rate or totalizer limit .................................................... 20
5.5.13 Change the default password ....................................................................................... 21
5.5.14 Reset the accumulated or totalized flow rate ................................................................. 21

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5.5.15 Exit the MENU ............................................................................................................ 21
5.5.16 Sleeping mode ............................................................................................................ 22
5.5.17 Wake up the meter ...................................................................................................... 22
5.5.18 MENU key sequence for the settings............................................................................. 23
5.6 RS485 Modbus communication protocol ................................................................. 24
5.6.1 Hardware connection .................................................................................................. 24
5.6.2 Communication parameters ......................................................................................... 24
5.6.3 Frame ........................................................................................................................ 25
5.6.4 Function codes ........................................................................................................... 25
5.6.5 Registers .................................................................................................................... 25
6. Product selection and order information ...................................................29
6.1 Product selection .................................................................................................. 29
6.2 Order contact and customer support ...................................................................... 29
7. Technical specifications ............................................................................ 30
8. Technical notes for the product performance ............................................. 31
8.1 Measurement principle .......................................................................................... 31
8.2 Precautions for the best performance of the product ............................................... 31
8.2.1 Comparison with a third party reference meter .............................................................. 31
8.2.2 Particle contamination and fluidic cleanness ................................................................. 32
8.2.3 Apply to a different gas medium................................................................................... 32
9. Troubleshooting ...................................................................................... 33
10. Warranty and Liability .............................................................................. 34
11. Service contact ........................................................................................ 36
Appendix I: Product evaluation kit .................................................................. 37
Appendix II: Document history .......................................................................38

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1. Overview
All contact information can be found at the end of this manual.
This manual provides essential information for the operation of the MF5700 series of gas mass flow
meters general-purpose gas metrology applications. The product performance, maintenance, and
trouble-shooting as well as the information for product order, technical support, and repair are also
included.
The MF5700 mass flow meter is one of the best selling mass flow meter products on market, due to
its performance and cost-effective design enabled with the company’s proprietary MEMS (micro-
electro-mechanical systems) thermal sensing technology. The current model is the 3rd generation of
the products having significantly upgraded features since its first release in 2010. The upgrade
includes much-improved accuracy, an additional model to cover flow range and channel size
compatibility; significantly extended measurement dynamic range, wireless data options, and valve
options. The upgrade also ensures the back-compatibility for our existing customers. Siargo is
committed to continuing product innovation while offering the best value to our customers.
This serial of products is designed for general purpose mass flow sensing and control purposes. The
wetted materials of the products are compatible with most of the common gases such as oxygen,
nitrogen, air, argon, carbon dioxide, etc. Siargo also offers a wide spectrum of off-the-shelf and
customized flow, pressure, temperature/humidity, and gas concentration sensing products and
provides integration and turn-key solutions to our customers. Please contact the manufacturer for
additional information.

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2. Receipt / unpack of the products
Upon receipt of the products, please check the packing box before the dismantlement of the packing
materials. Ensure no damages during shipping. If any abnormality is observed, please contact and
notify the carrier who shipped the product and inform the distributors or sales representatives if the
order is not placed directly with the manufacturer, otherwise, the manufacturer should be informed
as well. For any further actions, please refer to the return and repair section in this manual.
If the packing box is intact, proceed to open the packing box, and you shall find the product (either
the meter or the meter with valve per the actual order). The power adapter and/or data cable as
shown below may also be found according to your actual order.
or
Flow meter Flow sensor + valve Adapter data cable
Figure 2.1: MF5700 flow meter and accessories
Please check immediately for the integrity of the product as well as the power and data cable, if any
abnormal is identified, please notify the distributor/sales representative or manufacturer as soon as
you can. If any defects are confirmed, an exchange shall be arranged immediately via the original
sales channel. (Note: the LCD screen shall not be lighted until the battery is installed or the power
cable is plugged in). This user manual shall also either be included in the packing box or via an online
request for an electronic version. In most cases, this manual shall be made available to the customer
before the actual order.
The meter is designed with low power that can be operated with 4 AA-batteries. However, if you
ordered the product with the control valve, it is recommended to have external power since the valve
requires large power consumption. A power adapter must have a safety certification for use with this
meter. The external power/data connector is a type-C USB. See the detailed requirements in the
operation section.

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3. Knowing the products
3.1 Product description
Figure 3.1: MF5700 parts description
Figure 3.2: MF5700 with valve
Meter head
(rotatable)
Meter
body
LCD display
MENU keys
BSPP
connector
Flow
direction
Battery
chamber
cover
Data and
power port
Install
ation
screws
ON/OFF
solenoid valve

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3.2 LCD description
The LCD provides all information that the product
measures. Some symbols are reserved for future
upgrades, and will not be lighted during the
operation. The following table details the meaning
of each of the symbols.
Figure 3.3: LCD display
Table 3.1: Symbols description
ACC
The top row. The default displays the totalized flowrate in L (liters),
m3 (cubic meters), or SCF (standard cubic feet). It also displays
pressure (if kPa lights up) or temperature (if °C lights up)*.
Flow The 2
nd
row. Displays instant flow rate in L/min (Liters per minute)or
SCFH (standard cubic feet per hour) or m3/h (cubic meters per hour).
Battery status.
Valve status. The current product provides an ON/OFF control valve.
LoRa wireless protocol is enabled when lights up.
NB-IoT wireless protocol is enabled when lights up.
WIFI wireless protocol is enabled when lights up.
Bluetooth LE 4.2 wireless protocol is enabled when lights up.
Reserved for future upgrade of GPRS inclusion.
*Note: Both the pressure and temperature sensors can be integrated with the current product
but not with the default models. Please contact the manufacturer for further
information.

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3.3 Power and data cable description
Table 3.2: MF5700 wire assignment.
Figure 3.4: MF5700 cable (USB-C-100)
3.4 Mechanical dimensions
Figure 3.5: MF5700 meter dimensions
Wire
Color
Definition
1 Red Power supply (5~24 Vdc)
2
Black
GND, ground
3
Green
RS485A
4 White RS485B

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Figure 3.6: MF5700 meter with control valves dimensions
Table 3.3: Mechanical dimensions of the meters/meters with control valves
Connector, G L1 L2 LV1 LV2 W1 W2 H1 H2 H3
MF5706 BSPP ¼” 61 34 95.5 123 34 25 127 28 12.5
MF5708 BSPP 3/8” 81 45 110 134 45 30 134 35 15.5
MF5712 BSPP ½” 90 50 115 143 45 30 141 42 19.5

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4. Installation
Do not open or alter any part of the product which would lead to malfunction and irrecoverable
damage. It will also forfeit the terms of the warranty and cause liability.
The product at the time of shipment is fully inspected for its quality and meets all safety requirements.
Additional safety measures during the installation should be applied. This includes, but is not limited
to the leakage verification procedures, standard EDS (electrostatic discharge) precautions, DC
voltage precautions. Other tasks such as calibration, part replacement, repair, and maintenance
must only be performed by trained personnel. Upon requests, the manufacturer will provide
necessary technical support and/or training of the personnel.
The product is preferable to be installed horizontally. Flow direction should be aligned with the arrow
mark on the meter body. If the flowing fluid may have particles or debris, a filter is strongly
recommended to be installed upstream of the meter.
Please follow the following steps to complete the installation:
Figure 4.1: MF5700 meter installation
a) Upon opening the package, the product's physical integrity should be inspected to ensure no visual
damage.
b) Before installation of the product, please ensure that the pipe debris or particles or any other
foreign materials are completed removed.
c) Cautions during installation:
(i) It is preferably to first install the inlet end of the meter and then the outlet end of the meter;
To ensure the measurement accuracy, an upstream straight pipe of length no less than 10DN
and a downstream straight pipe of length no less than 5DN should be in place. Please refer to
the following recommended installation configuration.

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(a) 90-degree elbow or T-piece (b) 2x90-degree elbow
Figure 4.2: MF5700 meter installation
(ii) If the upstream or downstream pipe size is different from that of the product, the size of the
installation line pipe diameter(s) should be larger than the flow channel (pipe) size of the meters
to be installed. For some typical situations, please follow the installation recommendation
detailed in the following sketches.
(c) 2x90-degree elbow, 3 D (d) Pipe size-reduction
(e) Pipe size expansion (f) Control valve at upstream or downstream
Figure 4.3: MF5700 meter installation
(iii) During installation, please make sure no foreign materials (such as water, oil, dirt, particles,
etc.) entering into the installation pipeline.

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d) Install 4-AA batteries into the battery chamber. In case that the external power supply is desired,
connect electrical wires per the wire definition in Table 3.2. Please be sure of the power supply
range (i.e., 5 ~ 24 VDC) and power supply polarization. If an adapter other than the one supplied
by the manufacturer, make sure the adapter meets industrial standards and has all safety
certifications.
e) For the communication wire connection, please follow the description in Table 3.2 and make sure
that the wires are correctly connected to the proper ports on your data device/equipment. Please
make sure the data cable meets industrial standards with proper shielding.
f) Once the battery is installed, or the external power is successfully connected, the LCD should be
lighted up with the proper information displayed works correctly.
g) Slowly open the valve(s) if any, upstream or downstream or both of the pipeline, and the meter
should then start to measure the flow in the pipeline.
Note: because the meter has a large dynamical measurement range, it could be normal if you see
the small instant flow rate before you open the valve as there could be some leakage.
However, make sure the meter reads null when there is no flow present in the pipeline.
h) This will conclude the installation.
Cautions
a) Don't alter any parts of the product.
b) Ensure the electrical connection is properly done per the instructions.
c) Make sure no mechanical stresses in the connections.
d) The strong electromagnetic interference sources close by or any mechanical shocks at the
pipeline may also create malfunctioning of the product.
e) Slowly open/close valves to prevent abrupt pulse flow impact.

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5. Operation and MENU description
5.1 Check the product specifications
Before starting to use this product, check the product specifications that can be found in this manual
or the basic information located on the back panel of the product.
The detailed product technical specifications can be found in Section 7. For a specific application,
the pressure rating must not be higher than the system pressure to be measured, and the flow range
should also be within the specified ones. In most cases, the use of a high full-scale ranged meter for
the very low flow rate measurement often results in erroneous data. The gas to be measured must
also be consistent with that specified by the product. Be particularly cautious about the supplied
voltage indicated in the specification. A higher voltage may lead to irrecoverable damage, and a
lower voltage will not power the product for any desired functions.
For the best performance of the product, it is advised that the gas to be measured must be clean and
free of particles or other foreign materials.
5.2 Check the leakage
Check gas leakage before any measurement. If it is needed, the pressurized nitrogen or air can be
used for the leakage check.
5.3 Power the meter and digital data connection
Although this product complies with the CE-required EMC regulations, it also requires the product to
be used according to the standard electrical device practice. For general-purpose usage, the meter
can be power by 4-AA batteries. Be sure to select the batteries with safety proof and within the
expiration date. Do not use batteries without a known manufacturer and expiration date. For models
with control valves or for extensive usage, it is recommended to have the meter powered with
external DC power or an AC-DC adapter. Make sure the supply voltage is within the range of the
specified ones in Section 7. Before connecting the product with the external power, make sure the
standard electrical device precautions such as EDS (electrostatic discharge) and DC voltage are
observed. Excessive electrostatic discharge may damage the product.

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The power and data port are a standard Type-C USB port. The manufacturer supplied Type-C USB
cable has the screw locking fixture. It is recommended such a feature to ensure the cable is properly
engaged and will not be accidentally got unplugged.
Half-duplex RS485 Modbus is used for digital data communication. Make sure the wires are properly
connected at the receiver side.
5.4 Wireless data communication
The product has optional wireless data transmission, including Bluetooth LE 4.2, LoRa, WIFI, and NB-
IoT wireless data.
An application APP named “Siargo Smart Meter 2.0” can be downloaded from either Apple Store for
smart devices based on the iOS system or from Google Play Store for smart devices based on the
Android system.
The APP provides the basic functions to access the meter/sensor data, plot an instant flow rate chart,
calculate totalized or accumulated flow volume at a specific time defined by the user. It allows the
user to send the local data instantly to a remote destination when the wired connection is not an
option. Also, the interface provides the readout of the product information as well as technical
support information.
For the detailed protocols of LoRa, WIFI, and NB-IoT, please contact the manufacturer for further
information.
5.5 Meter MENU description
The meter has a front 3-key board for the user to set the desired functions, access data, and check
for the status. The Menu key (M) is at the central position that allows the user to select a function
and confirmation or other related actions that will be detailed below. Two keys (“Up” and “Down”)
to select the menu and sub-menu.
Up
MENU Down

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5.5.1 Starting the measurement
Once the power is supplied and no abnormal issues are observed,
the meter is ready to perform the measurements. The default
display is for the mass flow measurement having two numerical
lines on the LCD. The upper line is the accumulated or totalized
flow rate, and the lower line is the instant flow rate. If the battery
symbol turns into , proceed to change the battery or plug in
the external power cord.
5.5.2 MENU entry with a verified password
At the flow measurement (main) display, press the central “M” MENU key, it will enter into the
password setting and verification MENU. The default password is “11111”. If the password is incorrect,
the display will return to the main display.
To enter a new password, press the “Up” or “Down” key to change the digit that flashes, and press
the “M” key to confirm. Repeat this process for all 5 digits and the meter will enter into the menu
setting interfaces/screen.
Subsequently, the MENU allows the user to:
 Set Modbus address F2 - Addr
 Change communication baud rate F3 - bPS
 Reset or calibrate the offset F11 - oFFST
 Enter the gas conversion factor (GCF) F12 - GCF
 Change the display mode F38 - dISP
 Change the display language F39 - LAnG
 Open/Close the valve F43 - VALVE
 Set upper flow rate limit alarm F51 - ALM-H
 Set lower flow rate limit alarm F52 - ALM-L
 Set totalized or accumulated flow rate alarm F53 - ALM-A
 Change the default password F91 - PASS
 Clear or reset the totalizer or accumulated flow rate F92 - CLr-A
 Exit from the MENU F99 - qUIT
Note: During this process, the meter will continue to measure the flow without being interrupted.

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5.5.3 Set the RS485 Modbus address
After the password being verified and entering into the MENU
settings, press the “Up” or “Down” key until the screen shows the F2
- Addr as indicated to the left.
The Modbus address has 3 digits, which can be any number between
001 to 255. Press the “M” key to enter into the change address screen.
Press the “Up” or “Down” key to change the flashing digits, and then
press the “M” key to confirm. After the address is set, the display will
return to F2 - Addr, which indicates the task is completed. Press the
“Up” or “Down” key to select F99 - qUIT and the “M” key to exit the
MENU and return to the Main Display screen.
5.5.4 Set the RS485 communication baud rate
Following the above-mentioned steps, at the MENU setting screen,
use the “Up” or “Down” key to select F3 - bPS and then press the
“M” key to set the RS485 communication baud rate.
There are 6 baud rates selectable, depending on your system
requirements: 4800, 9600, 19200, 38400, 57600, and 115200. The
default baud rate is 9600. Use the “Up” or “Down” key to select the
desired one and press the “M” key to confirm. The display will then
return to the F3 - bPS screen, which indicates the task is completed.
Use the “Up” or “Down” key to select F99 - qUIT and the “M” key to exit the MENU and return to the
Main Display screen.
5.5.5 Reset or calibrate the offset
After a certain time of usage, the meter’s offset (zero flow rate)
might or might not have a small shift. Or when you apply the meter
for different gases, the offset might be shifted. To ensure
measurement accuracy, it is necessary to reset or calibrate the offset.
Following the above-mentioned steps, at the MENU setting screen,
use the “Up” or “Down” key to select F11 - oFFST. Before performing
the task, make sure there is absolutely no flow in the flow channel,
otherwise, it will create even bigger erroneous measurement results.

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Press the “M” key to confirm the task, and it will open the sub-MENU asking you to confirm. Use the
“Up” or “Down” key to select the desired one and press the “M” key to confirm. The display will then
return to the F11 - oFFST screen, which indicates the task is completed. Use the “Up” or “Down” key
to select F99 - qUIT and the “M” key to exit the MENU and return to the Main Display screen.
5.5.6 Gas conversion factor (GCF) for different gas measurement
For the general purpose of the application, a gas conversion factor
(GCF) can be applied to meter the gas different from the default one
or the one used for calibration. The GCF is determined by the
thermal calorimetric sensing principle as well as the meter fluidic
dynamic design and the control circuitry. Contact the manufacturer
to obtain the values corresponding to the correct models.
The GCF for air is 1000.
Note: If the meter during purchase is ordered for a special real gas calibration, contact the
manufacturer before further proceeding.
Following the above-mentioned steps, at the MENU setting screen, use the “Up” or “Down” key to
select F12 - GCF. Press the “M” key to confirm, and it will open the sub-MENU showing the current
gas conversion value. Use the “Up” or “Down” and the “M” confirming key to input the desired value,
and press the “M” key again to complete the task. The display will then return to the F12 - GCF screen,
which indicates the task is completed. Use the “Up” or “Down” key to select F99 - qUIT and the “M”
key to exit the MENU and return to the Main Display screen.
5.5.7 Select the display mode
This function is to set the display modes, cycle display mode or fixed
display mode. If one likes to switch between these two display
modes, following the above-mentioned steps, at the MENU setting
screen, use the “Up” or “Down” key to select F38 - dISP. Press the
“M” key to confirm, and it will open the sub-MENU showing the
current display mode. Use the “Up” or “Down” and the “M”
confirming key to select the desired one, and press the “M” key
again to complete the task. The display will then return to the F38 -
dISP screen, which indicates the task is completed. Use the “Up” or “Down” key to select F99 - qUIT
and the “M” key to exit the MENU and return to the Main Display screen.

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5.5.8 Select the display language
This function is reserved for future upgrades. The current models are
configured to be English or Chinese based on the shipping
geographic regions. However, if one likes to switch between these
two default languages, following the above-mentioned steps, at the
MENU setting screen, use the “Up” or “Down” key to select F39 -
LAnG. Press the “M” key to confirm, and it will open the sub-MENU
showing the current language. Use the “Up” or “Down” and the “M”
confirming key to select the desired one, and press the “M” key again
to complete the task. The display will then return to the F39 - LAnG
screen, which indicates the task is completed. Use the “Up” or “Down” key to select F99 - qUIT and
the “M” key to exit the MENU and return to the Main Display screen.
5.5.9 Open/close the valve
This function is to open or close the valve. If one likes to open or close
the valve, following the above-mentioned steps, at the MENU setting
screen, use the “Up” or “Down” key to select F43 -VALVE. Press the
“M” key to confirm, and it will open the sub-MENU showing the
current valve status. Use the “Up” or “Down” and the “M” confirming
key to select the desired one, and press the “M” key again to
complete the task. The display will then return to the F43 - VALVE
screen, which indicates the task is completed. Use the “Up” or “Down”
key to select F99 - qUIT and the “M” key to exit the MENU and return
to the Main Display screen.
5.5.10 Set an alarm: upper instant flow rate limit
This function allows the user to set the instant flow rate above which
the meter will trigger the alarm function. The alarm will be a sharp
sound every 2 seconds whiling the screen/display will flash. The
triggered alarm will not stop the meter from continuous operation.
The alarm will be off once the metering value is below the set value.
The flow rate has two decimal points with a maximum not over the
full-scale flow rate at the order. Following the above-mentioned
steps, at the MENU setting screen, use the “Up” or “Down” key to
select F51 - ALm-H. Press the “M” key to confirm, and it will open the sub-MENU showing a default
flow rate of 999.99. Use the “Up” or “Down” and the “M” confirming key to enter the desired one,
and press the “M” key again to complete the task. The display will then return to the F51 - ALm-H