Azbil CML 050 User manual

Thank you for purchasing an Azbil
Corporation product.
This manual contains information for
ensuring the correct use of this product.
It also provides necessary information
for installation, maintenance, and
troubleshooting.
This manual should be read by those who
design and maintain equipment that uses
this product. Be sure to keep this manual
nearby for handy reference.
No. CP-SP-1161E
CML 050/080/100/150
High-Flow Mass Flow Meter
User's Manual

NOTICE
Be sure that the user receives this manual before the product is used.
Copying or duplicating this user’s manual in part or in whole is forbidden.
The information and specifications in this manual are subject to change
without notice.
Considerable effort has been made to ensure that this manual is free from
inaccuracies and omissions. If you should find an error or omission, please
contact the azbil Group.
In no event is Azbil Corporation liable to anyone for any indirect, special or
consequential damages as a result of using this product.
“Natural gas” in this document refers to city gas in Japan.
NOTICE
© 2004–2020 Azbil Corporation All Rights Reserved.
The µF™is a trademark of Azbil Corporation in Japan.
is a trademark Azbil Corporation.

i
 The safety precautions explained in the following section aim to prevent injury to the operator and others, and to
prevent property damage.
WARNING Warnings are indicated when mishandling this
product might result in death or serious injury.
CAUTION Cautions are indicated when mishandling this
product might result in minor injury to the user, or
physical damage to the product.
 In describing the product, this manual uses the icons and conventions listed below.
Use caution when handling the product.
The indicated action is prohibited.
Always follow the indicated instructions.
Handling Precautions:
Handling Precautions indicate items that the user should pay attention to when handling
the CML.
Note:Notes indicate information that might benefit the user.
This indicates the item or page that the user is requested to refer to.
(1) (2) (3): Numbers within parentheses indicate steps in a sequence or parts of an explanation.
S-02 This indicates 7-segment indication on the setup display.
MODE
key This indicates a key on the display.
Conventions Used in This Manual

ii
WARNING
If this device is used with a flammable gas such as natural gas 13A, propane, or butane, install
it on the upstream side of the safety shutoff valve.
If air somehow enters the piping, resulting in an explosive mixture, and the sensor makes a
spark due to some cause like a lightning strike, an explosion could occur inside the pipe.
Do not use this device or the connected pipes as a step. Doing so can damage the device or
pipes, and if you lose your footing you could be injured.
The mass of this device is 14 to 45 kg or more. When moving or transporting it, use
equipment such as a dolly or use 2 or more people. Carelessly hoisting the device and
accidentally dropping it can cause injury or damage.
CAUTION
Do not mount with the display facing down. Doing so might cause measurement error or
device failure.
Do not flush out the pipes with this device installed. If foreign matter enters the device, it
may give faulty measurements or break down.
To prevent leakage from the pipes, tighten bolts to the specified torque.
Be sure the load connected to the output terminals does not exceed the rated values given in
the specifications. An excessive load can damage this device.
After wiring and before turning the power on, be sure to check that the wiring, the polarity of
the power, etc., are correct. Incorrect wiring can cause malfunction or damage.
Be sure that the operating gas temperature does not fall to −25°C. At −25°C and below, the
O-ring may crack, allowing gas to leak out.
After the piping work is complete, remove the temporary support brackets. Otherwise
someone might bump into them and be injured.
Be sure to use this device within the flow-rate range stipulated in the product specifications.
To prevent excessive flow, use a suitable means to control the supply pressure or use a
throttle valve or the like to control the flow rate.
If the flow rate exceeds the high limit, both the flow rate display and the output voltage/
current may indicate considerably lower values than the actual flow rate.
If loss or damage could result from the abnormal functioning of this device, include
appropriate redundancy in the system design.
Safety Precautions

iii
Check the following items when unpacking:
1. Check the model number to make sure you received the correct product.
2. Check for any obvious damage.
3. Check the contents of the package against the packing list to make sure that all items are included.
Items included in the CML are shown below. Handle the CML and its accessories with care to prevent damage or loss
of parts. If there is any problem with your order, please contact your dealer immediately.
Name Model No. Q’ty Remarks
Flowmeter CML _ _ _ _ 1 See Model selection table (P.1-2)
User’s Manual CP-SP-1161E 1 This manual
Fuse 250 V 3 A 1 This is a replacement part. (A fuse has already
been installed in the terminal box fuse
holder.)
Waterproof gland 2 Used for the wiring ports.
Inspection report 1 A report on the results of inspection of this
device
Unpacking

iv
Contents
Conventions Used in This Manual
Safety Precautions
Unpacking
Chapter 1. OVERVIEW 1-1
 Overview 1-1
 Features 1-1
 System configuration example 1-1
 Model selection table 1-2
 Gas types and flow rate ranges 1-2
Chapter 2. NAMES AND FUNCTIONS OF PARTS 2-1
Chapter 3. INSTALLATION AND WIRING 3-1
 Installation location 3-2
 Behavior when the flow rate greatly exceeds the measurement range 3-3
 Notes on piping 3-3
 Pipe installation 3-8
 Wiring 3-11
Chapter 4. OPERATION 4-1
 Flow rate indication 4-1
 Temperature and pressure indication 4-1
 Totalized flow display and totalized count reset function 4-1
 How to set up functions 4-1
 Function setup item list 4-2
 Parameter setup 4-4
 Parameter setup table 4-5
Chapter 5. TROUBLESHOOTING 5-1
Chapter 6. SPECIFICATIONS 6-1
 Specifications 6-1
 External dimensions 6-3
 Pressure loss (flow rate and pressure loss characteristics) 6-4
 Filters 6-7
Terms and Conditions

1-1
 Overview
The CML High-Flow Mass Flow Meter features high accuracy and high rangeability,
which are made possible by Micro Flow thermal mass flow sensors (hereafter, μF
sensors) developed by Azbil Corporation.
 Features
• This thermal mass flow meter does not need temperature and pressure
compensation. Since expensive temperature and pressure compensation
equipment is not required, substantial cost reduction is possible.
• The CML incorporates μF sensors made with silicon micromachining and thin-
film technology. Each of the μF sensor's sides is only 1.7 mm long, and it is just
0.5 mm thick. Four of these highly sensitive and fast-responding flow speed
sensors are built into the flowmeter.
• To cover high and low flow rate ranges, two sensors of each type are mounted 90˚
apart on the wall of the gas flow path. By switching alternately the sensor groups
according to the flow rate range, the CML can achieve high accuracy (±2 % rdg.
at 5 % FS or more in the measurement range) and high rangeability (160:1 for all
models) in flow rate measurement.
• To meet a variety of requirements, the CML's functions include an LCD display,
analog output (4–20 mA), display of totalized flow, totalized pulse output
(open collector), and instantaneous flow alarm output. In addition, since a
communication function is a standard feature, dramatic cost reduction in
instrumentation is possible when data is transferred to the host system.
• Thanks to built-in photoelectric touch sensors, settings can be changed without
opening the case.
• A flow rectifying mechanism is built into the flow path of the device, allowing
shorter straight pipe sections. Even if this device is mounted downstream from an
elbow, it can be used without a straight pipe section.
 System configuration example
LOADER
power
SD
RD
SD
RD
HOST CMC CMC LOCAL
CMCADDRESS
7
8
9
12
0
34
5
6
7
8
9
12
0
HOST CMC
B.RATE
ERR
RESET
CMC10
11
12
13
14
15
CMC10G
PLC from 3rd-party mfr.
Smart Terminal
(EST-Z, etc.)
Pulse counter
(PCG13)
PLC etc.
Pulse output
Event output
4–20 mA instantaneous
ow rate output
Controller
(SDC, etc.)
Slave station (CML, etc.)
RS-485 communications
Chapter 1. OVERVIEW

1-2
Chapter 1. OVERVIEW
 Model selection table
Basic
model
No.
Pipe
size Model
Gas-
contacting
material
Connection
method
Gas
type Output Power
source Communication Mounting
orientation
Option
Suffix Description
1 2
CML High-flow mass flow meter
050 50 A (2B)
080 80A (3B)
100 100 A (4B)
150 150 A (6B)
0 Operating pressure range: 0 to
less than 1 MPa
S Material of major parts:
SUS304/SCS13
J JIS 10K RF flange
N Air/nitrogen (The setting
can be changed to another
standard compatible gas.*1)
S Oxygen*3
0 4–20 mA output + totalized
pulse output
F Flexible, from 85 to 264 V AC
(50/60 Hz)
1 RS-485 communications
0 Horizontal (flow direction: left
to right)*2
1 Horizontal (flow direction: right
to left)*2
2 Vertical (flow direction:
upward)*2
3 Vertical (flow direction:
downward)*2
0 None
*1. Standard compatible gases are air/nitrogen, natural gas 13 A (LNG), argon, butane, propane,
and carbon dioxide (CO2). The setting can be changed using the display panel keys.
*2. Specify when ordering. The selection cannot be changed after delivery.
*3. If gas type S is selected, be sure to specify 1 (degreasing) for option 1.
1 Degreasing for gas-contacting
parts
D With inspection report
Y Inspection report + traceability
certificate
K Inspection report + traceability
certificate + calibration report
0 Product version
 Gas types and flow rate ranges
Gas type Gas type
setting S-08
Flow range [m
3
/h (normal)]
CML050 CML080 CML100 CML150
Air/Nitrogen 00 0 to 160 0 to 400 0 to 650 0 to 1600
Oxygen 01*10 to 160 0 to 400 0 to 650 0 to 1600
Carbon dioxide (CO2) 02 0 to 120 0 to 300 0 to 480 0 to 1200
Argon 03 0 to 160 0 to 400 0 to 650 0 to 1600
Natural gas13A (46MJ)*204 0 to 160 0 to 400 0 to 650 0 to 1600
Butane*205 0 to 50 0 to 120 0 to 190 0 to 480
Propane*206 0 to 60 0 to 140 0 to 220 0 to 500
Natural gas13A (45MJ)*209 0 to 160 0 to 400 0 to 650 0 to 1600
*1. “01: Oxygen” can be selected only for oxygen models.
*2. Chapter 6. SPECIFICATIONS. (P.6-2)

2-1
Instantaneous flow rate display: 5 digits (m3/h)
Totalized flow display: 9 digits (m3)
Unit of pressure
Keys
Eyebolt
Built-in filter
Used to protect the device.
Ordinarily it should not be
removed.
Event LEDs
EV1, EV2: Lit when event output turns on
EV3: Lit when self-diagnostic output is generated.
MODE key: Used for setting parameters
↑and ↓keys: Used for changing parameter values or switching
the display between temperature and pressure
ENT key: Used for confirming and saving settings
Terminal box
Used for wiring for power, instanta-
neous flow rate output, totalizer pulse
output, event output, and totalized
flow reset input.
Wiring port
(with waterproof gland)
Display and keys
Used for display of instantaneous
flow rate, totalized flow, alarm
status, and errors, and for setup of
this device.
Eyebolt
Used for hanging this device from
an overhead crane or the like
during installation in the piping.
After pipes are connected, remove
the eyebolts.
Downstream side
of the flow
Flange
JIS 10K RF flange
Connected to the
piping.
Upstream side
of the flow
Overturn prevention brackets
Used when this device is
temporarily placed on the ground.
Remove them after installation in
the piping.
Note: There are three wiring ports. Only one waterproof gland is attached before shipment, to the top port. The other two
waterproof glands are included with the CML. The figure shows the flowmeter when all three glands are attached to
the wiring ports.
Chapter 2. NAMES AND FUNCTIONS OF PARTS

-MEMO-

3-1
WARNING
If this device is used with a flammable gas such as natural gas 13A, propane, or butane, install
it on the upstream side of the safety shutoff valve.
If air somehow enters the piping, resulting in an explosive mixture, and the sensor makes a
spark due to some cause like a lightning strike, an explosion could occur inside the pipe.
Do not use this device or the connected pipes as a step. Doing so can damage the device or
pipes, and if you lose your footing you could be injured.
The mass of this device is 14 to 45 kg or more. When moving or transporting it, use
equipment such as a dolly or use 2 or more people. Carelessly hoisting the device and
accidentally dropping it can cause injury or damage.
CAUTION
Do not mount with the display facing down. Doing so might cause measurement error or
device failure.
After the piping work is complete, remove the temporary support brackets. Otherwise
someone might bump into them and be injured.
Handling Precautions
• This device is a precision instrument. Do not drop it or subject it to shock.
Doing so might damage the device.
• When connecting pipes to this device, be sure that the pipes are not on a slant
or misaligned. Failure to do so could cause leakage or other problems.
• When installing, fasten firmly to prevent vibration.
• When used outdoors, protect the device from direct sunlight.
• If there is a possibility of rust, oil mist, dust, etc. entering the piping, be sure to
provide an upstream strainer so that foreign matter does not enter the device.
Foreign matter can cause faulty operation.
• When wiring, take care not to pull on the display. The internal connections
may be damaged.
• Be sure to run the wiring for 4–20 mA output, open collector output, and
communication separately from high voltage lines and power lines. Do not
put them in the same conduit. Doing so might cause malfunction.
• Be sure to mount a switch for shutoff of the main power to this unit within
reach of the operator.
• With the exception of supply power and relay contact output, the I/O common
mode voltage with respect to the ground should be 33 Vrms max., 46.7 V peak
max., and 70 V DC max.
• After the piping work is complete, remove the eyebolts.
• Gas must flow through the meter in the direction of the arrow on the side
of the flow channel. Flow in the opposite direction cannot be measured
accurately.
Chapter 3. INSTALLATION AND WIRING

3-2
Chapter 3. INSTALLATION AND WIRING
 Installation location
Avoid installing the device where it will be subject to conditions such as the
following.
• Ambient temperature colder than −25°C or hotter than +60°C
• Humidity higher than 90%RH
• Sudden temperature fluctuations causing dew condensation
• Corrosive gas or flammable gas atmosphere
• Large amounts of dust, salt, iron powder or other conductive substances
• Direct vibration or shock
• Direct sunlight
• Splashing by fluids (e.g. oil, chemicals)
• Strong magnetic or electrical fields
GasGas
Gas ow
Note: Make sure that the gas flows in the direction of the arrow on the side of the body.
If the gas flows in the opposite direction, it cannot be measured accurately.
Handling Precautions
• This device may be installed outdoors, but it is advisable to shield it from
direct sunlight. In direct sunlight its temperature will rise, possibly causing
malfunction or device failure.
• To facilitate maintenance, leave enough space to access the terminal box, as
shown in the illustration below.
400 mm
400 mm

3-3
Chapter 3. INSTALLATION AND WIRING
 Behavior when the flow rate greatly exceeds the measurement range
CAUTION
Be sure to use this device within the flow-rate range stipulated in the product specifications.
To prevent excessive flow, use a suitable means to control the supply pressure or use a throttle
valve or the like to control the flow rate.
If the flow rate exceeds the high limit, both the flow rate display and the output voltage/
current may indicate considerably lower values than the actual flow rate.
If loss or damage could result from the abnormal functioning of this device, include
appropriate redundancy in the system design.
If the flow rate exceeds the high limit for measurement, the correct value may not
be displayed or output. Be sure to use the device within the measurement range
stated in the specifications.
If the actual flow rate exceeds the upper limit of the range by 120 % or more, any
further increase will not be indicated by the flow rate display or the output voltage/
current. Furthermore, if the flow rate exceeds the limit by 200 %, both the flow rate
display and the output voltage/current will begin to decrease as if they were within
the measurement range.
Also, take care because if there is a sudden excessive flow rate (200 % or more) for a
very short period, a flow rate within the normal range may be displayed and output,
with no display or output of the flow rate upper limit.
Especially when this device is used for flow control, make sure to take appropriate
measures, such as controlling the supply pressure or using a throttle valve, so that
even at maximum control output, the flow rate does not exceed 120 % of the high
limit of the range.
Actual ow rate
Flow rate
(display and output)
Flowrate range
100 %
High limit
200 %
120 %
 Notes on piping
z Precautions for piping work
This device is a precision instrument. If foreign matter like dust, moisture, or oil
mist enters the device, measurement error or device failure may result.
During piping work, follow the instructions below to keep foreign matter out of the
device.
• Before installing the device, thoroughly flush the inside of piping that is upstream
and downstream of this device to remove welding fumes and dust.

3-4
Chapter 3. INSTALLATION AND WIRING
• Thoroughly clean the inside of piping that is directly connected to the device.
• When installing, be sure to provide bypass piping as shown in the figure below.
Also, valves both before and after the device should be of a type that does not
disturb the gas flow, such as ball valves
Clean inside of these pipes.
Downstream pipingUpstream piping
CML
Valve on bypass piping
Filter
• Refer to the drawings below for the straight pipe length on the upstream side.
D represents the pipe's internal diameter. If the flowmeter and the pipe on the
downstream side have the same internal diameter, no straight pipe section is
necessary. If the device and the pipe on the downstream side have different pipe
sizes, provide a straight pipe section whose length is twice the pipe diameter.
5D min. 5D min.
5D min.
5D min.
CML
CML
CML CML
CML
CML
CML CML
CML
5D min.
CML
Upstream side
90° bend
FC filter (made by Azbil Kimmon) MFF300-L filter
MFF100* (made by Azbil Corporation)MFF300-Y filter
Tee
Fully open gate valve Other valves
Reducer (regarded as straight pipe section)
Reducer with an angle of 15° or more
(if less than 15°, it can be regarded as a straight
pipe section)
No straight pipe
section is needed.
No straight pipe
section is needed.
No straight pipe
section is needed.
No straight pipe
section is needed.
No straight pipe section is needed.
* Straight pipe section not needed. However, at the filter exit, screws , a flange adapter, or
DIN-JIS flange adapter is needed.

3-5
Chapter 3. INSTALLATION AND WIRING
• If oil, moisture, or dust is contained in the fluid, install a device that can remove
them. If the fluid contains oil, moisture, or dust, measurement error or device
failure may result.
• Remove moisture using a dryer to prevent condensation in the pipe.
• If a dust-removing filter is used, its mesh size must be 1 μm or smaller.
• If a mist separator is used to remove oil, the concentration of residual oil content
must be 0.01 mg/m3or less.
Azbil Corporation's Specification sheet CP-SS-1824 (in Japanese)(for mist
separators)
• Do not install the device where it is subject to a pulsating flow.
• Do not install the device near the outlet of a compressor. Near a compressor
outlet there is a strong pulsating flow and, depending on the compressor type,
possibly dispersion of iron powder, etc., which can result in failure of this device.
Note
• As shown in the diagram below, if the CML is downstream from a
compressor, install devices between the compressor and the CML
to eliminate foreign matter like oil, moisture, and iron powder. As a
countermeasure for a pulsating flow, install the CML after a receiver tank or
the like.
FilterAir tank Dryer Mist
separator
Receiver
tank
CML
CML
F F
Compressor Compressor (screw type, etc.)
• Take sufficient countermeasures if the CML is installed near a pump. If the
CML is installed near a pump, pulsations may affect the device. In this case,
install a receiver tank, etc. between the pump and the CML to minimize the
influence of pulsation.
Handling Precautions
• If foreign matter cannot be fully eliminated by flushing or wiping, or if the
regular presence of foreign matter can be expected, be sure to install a
filter. If dust, oil, or moisture adheres to the metallic mesh or to the Micro
Flow sensor chip inside the CML, measurement error or device failure may
result.

3-6
Chapter 3. INSTALLATION AND WIRING
z Built-in filter
Converter
Detector
Pressure
sensor Protective wire mesh
Built-in filter
(on downstream side)
Thermistor for gas temperature
μF sensor
Built-in filter
(on upstream side)
Flow direction
Flow straightening section
The CML is equipped with built-in filters on the upstream side and downstream
side as a standard feature.
Their purpose is to temporarily protect the CML from dust during piping work. If
a large amount of dust enters the filter, pressure loss could become great enough to
stop the gas flow.
Handling Precautions
• If a large amount of dust enters the filters, or if there is a possibility of dust
regularly entering the gas flow, be sure to install a permanent filter on the
upstream side. Azbil Corporation's Specification sheet CP-SS-1824
(in Japanese) (for permanent filter). In addition, since the built-in filters
cannot eliminate moisture or oil, be sure to install an external filter to
remove such foreign matter.
The built-in filter causes pressure loss as shown in the graphs on page 6-4 and 6-5.
If no dust enters the filter at all, and if less pressure loss is desired, remove the built-
in filter so that pressure loss is reduced as shown in the graphs on page 6-6.
How to remove the built-in filters
(1) For the built-in filter on the upstream side, pull the
tab on the packing that holds the filter, and remove
the packing.
Packing tab
(2) For the built-in filter on the downstream side,
hook the C-ring with a flathead screwdriver and
remove it. C-ring
(3) Remove the built-in filter. If it is hard to remove
the filter, use adhesive tape to remove it as shown
in the bottom photo.

3-7
Chapter 3. INSTALLATION AND WIRING
z Filter installation
If foreign matter in the gas adheres to one of the CML's sensors, it may cause faulty
operation or measurement error. If a filter is needed, be sure to select a filter from
the following.
1. Filters for natural gas
• FC filter (manufactured by Azbil Kimmon)
Operating pressure range: 0 to 0.3 MPa
Filter element: Built-in
FC filter (manufactured by Azbil) Spare filter element for FC filters
(manufactured by Azbil Corporation)
Pipe size Part No.
50A 80394037-001
80A 80394038-001
100A 80394039-001
150A 80394040-001
• FDSNC type filter (Manufactured by Azbil Kimmon)
Operating pressure range: 0 to 0.98 MPa
Filter element: Built-in
FDSNC filter
(manufactured by Azbil Corporation)
Spare filter element for FDSNC
filters(manufactured by Azbil Corporation)
Pipe size Part No.
50A 80394057-001
80A 80394057-002
100A 80394057-003
150A 80394057-004
• MFF300-Y filter
Operating pressure range: 0 to 0.98 MPa
Filter element: Built-in
• MFF300-L filter
Operating pressure range: 0 to 0.98 MPa
Filter element: Built-in
2. Filters for gas that always contains oil mist, such as
compressed air, propane, or butane
Model No.: MFF100NAG/MFF100NSG
For detailed specifications: Azbil Corporation's
Specification sheet CP-SS-1824 (in Japanese).

3-8
Chapter 3. INSTALLATION AND WIRING
 Pipe installation
WARNING
The mass of this device is 14 to 45 kg or more. When moving or transporting it, use
equipment such as a dolly or use 2 or more people.
Carelessly hoisting the device and accidentally dropping it can cause injury or damage.
CAUTION
Do not flush out the pipes with this device installed. If foreign matter enters the device, it may
give faulty measurements or break down.
To prevent leakage from the pipes, tighten bolts to the specified torque.
Purge and thoroughly clean the inside of piping that is upstream and downstream of this
device to remove welding fumes and dust. Failure to do so might cause the flowmeter to break
down due to entry of foreign matter.
Handling Precautions
• Be sure to flush the inside of the pipe before installation of this device to
eliminate any foreign matter which might be inside the pipe.
z Gasket installation
A gasket is required for flange connections.
Refer to the table below to determine the gasket's inner diameter.
Pipe size Gasket inner diameter
(reference value)
50 A 61 mm
80 A 90 mm
100 A 115 mm
150 A 167 mm
Handling Precautions
• If the inner diameter of the gasket is too small, it might disturb the flow
velocity distribution, affecting the measurement accuracy.
• If the inner diameter of the gasket is too large, it might cause leakage.

3-9
Chapter 3. INSTALLATION AND WIRING
z Flange type
Use a flange that has a large area of contact with the gasket.
Good Bad
Flange Flange
Pipe Pipe
Welded part
Welded part
Welded part
(Leak may occur
because contact area
with gasket surface is
small.)
z Flange connection
Tighten the flange bolts.
Tightening torque
Pipe size Torque Unit: N·m (kgf·cm)
50 A 37 to 47 (378 to 480)
80 A 26 to 36 (265 to 367)
100 A 32 to 42 (327 to 429)
150 A 64 to 74 (653 to 755)
(The value in parentheses indicates reference.)

3-10
Chapter 3. INSTALLATION AND WIRING
Handling Precautions
• Tighten bolts uniformly. If leakage does not stop after the bolts have been
tightened, tighten them further little by little.
• Tighten bolts to the specified torque. Doing otherwise may result in damage.
• Do not force the CML into a narrow space between flanges. Doing so might
cause leakage or damage.
• Do not allow pipes to slant or to become misaligned during installation.
Pipe is at an angle Off-center Off-center