Azbil CMG Series User manual
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No. CP-UM-5477E
TM
CMG Series
Gas Flow Monitor
USA Model
User's Manual
Thank you for purchasing the CMG
Series Gas Flow Monitor.
This manual contains information for
ensuring the correct use of the CMG
Series. It also provides necessary infor-
mation for installation, maintenance,
and troubleshooting.
This manual should be read by those
who design and maintain equipment
that uses the CMG Series. Be sure to
keep this manual nearby for handy ref-
erence.
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This product has been designed, developed and manufactured for general-purpose
application in machinery and equipment.
Accordingly, when used in applications outlined below, special care should be taken to
implement a fail-safe and/or redundant design concept as well as a periodic
maintenance program.
•Safety devices for plant worker protection
•Start/stop control devices for transportation and material handlingmachines
•Aeronautical/aerospace machines
•Control devices for nuclear reactors
Never use this product in applications where human safety may be put at risk.
RESTRICTIONS ON USE
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 forbid-
den. 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 omis-
sion, please contact Yamatake Corporation.
In no event is Yamatake Corporation liable to anyone for any indirect,
special or consequential damages as a result of using this product.
©2007 Yamatake Corporation ALL RIGHTS RESERVED
The µFTM, CMGTM are trademark of Yamatake Corporation in Japan.
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WARNING
CAUTION
Warnings are indicated when mishandling this product
might result in death or serious injury.
Cautions are indicated when mishandling this product
might result in minor injury to the user, or only physical
damage to the product.
SAFETY PRECAUTIONS
■
About Icons
The safety precautions described in this manual are indicated by various icons.
Please be sure you read and understand the icons and their meanings described
below before reading the rest of the manual.
Safety precautions are intended to ensure the safe and correct use of this prod-
uct, to prevent injury to the operator and others, and to prevent damage to proper-
ty. Be sure to observe these safety precautions.
■
Examples
Triangles warn the user of a possible danger that may be caused by
wrongful operation or misuse of this product. These icons graphically
represent the actual danger. (The example on the left warns the user of
the danger of electric shock.)
White circles with a diagonal bar notify the user that specific actions are
prohibited to prevent possible danger. These icons graphically represent
the actual prohibited action. (The example on the left notifies the user
that disassembly is prohibited.)
Filled-in black circles instruct the user to carry out a specific obligatory
action to prevent possible danger. These icons graphically represent the
actual action to be carried out. (The example on the left instructs the
user to remove the plug from the outlet.)
i
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WARNING
When using combustible gas, install the device upstream of the safety
shut off valve. If air somehow enters the piping, and the sensor makes a spark
due to some cause like a lightning strike when an explosive mixture is
present, an explosion could occur inside the pipe.
On flanged models, do not use the device or installed pipes as a footrest.
Doing so might damage the device or piping, or cause a slip which might
result in injury.
Flanged models are heavy. Dropping them on your feet may cause injury.
The device is intended for use with natural gas and air.
Do not use the device for other types of gases. Use of the gases having an
ignition temperature lower than 365°C may cause an internal pipe explosion.
A heater incorporated in a sensor could act as an ignition source if air has
entered the piping and explosive mixed gas is produced.
Use the analog outputs and alarm contact outputs on the device for
monitoring the gas flow rate of a burner or other equipment. Do not use these
outputs in applications where safety will be impaired when an analog output
abnormality or alarm contact output malfunction occurs.
Before wiring the device, be sure to turn the power OFF. Failure to do so might
cause electric shock.
CAUTION
This device is a precision instrument. Do not drop it nor subject it to shock.
Doing so might damage the device.
Do not peel off the pipe connection port seals until immediately before you
connect the piping. Doing so might allow foreign objects to enter the
connector port and cause defective operation.
On rusty, welding fumes, slag, water droplet, oil mist or dusty piping, install a
filter upstream to prevent foreign matter from entering the device. Foreign
matter may cause faulty operation.
When wiring, take care not to tug on the display. The components inside
might become damaged.
Be sure to use only rated fuses for replacement. Use of a non-rated fuse
prevents the safety circuit from functioning properly.
Be sure to check that the wiring is correct before you turn the power ON.
Incorrect wiring may cause damage or malfunction.
Connect the power supply last. Otherwise touching terminals by mistake may
cause electric shock or damage the device.
Make sure that the load to be connected to terminals does not exceed the
rating indicated in the specifications.
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CAUTION
Supply power at the voltage indicated on the model number label on the
device.
Take the necessary countermeasures with the instrumentation to prevent the
occurrence of backfire and to avoid any influence to the device even if
backfiring occurs. Pressure increase in the piping or fire caused by backfire
of the burner could damage the device.
When disposing of the device, observe local regulations.
Unpacking
Check the following items when removing the CMG series from its package:
1. Check the model number to make sure you received the correctproduct.
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.
Handle the CMG series and its accessories with care to prevent damage or loss ofparts.
If there is some problem with your order, please contact your dealer immediately.
Name
Model No.
Q'ty
Remarks
Body
CMG _ _ _ _
1
See, model selection guide,
(page 2).
Plug
81503603-001
1
Attached to one of the wiring
holes.
Packing seal
MPA-50003
1
User's Manual
CP-UM-5477E
1
This manual.
Conventions Used in This Manual
The following conventions are used in this manual:
Handling Precautions:
Handling Precautions indicate items that the user should pay attention to
when handling the CMG Series.
Note: Notes indicate information that might benefit the user.
(1), (2), (3): Numbers in parentheses indicate steps in a sequence or parts of an expla-
nation.
iii
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Contents
SAFETY PRECAUTIONS
Unpacking
Conventions Used in This Manual
Chapter 1. INTRODUCTION
■
Introduction•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
■
Features ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
■
Model selection guide•••••••••••••••••••••••••••••••••••••••••••••••••••• 2
Chapter 2. NAMES AND FUNCTIONS OF PARTS
Chapter 3. MOUNTING AND WIRING
■
Mounting••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5
■
Pipes••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
■
Wiring•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 9
Chapter 4. OPERATION
■
Displaying the flow rate••••••••••••••••••••••••••••••••••••••••••••••••• 12
■
Resetting alarms•••••••••••••••••••••••••••••••••••••••••••••••••••••••• 13
■
Resetting the integrated flow rate ••••••••••••••••••••••••••••••••••••••13
■
Displaying the total flow rate ••••••••••••••••••••••••••••••••••••••••••• 14
Chapter 5. ADVANCED OPERATION
5-1 Function Setup ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15
■
Setting operation ••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15
■
Function setup item list••••••••••••••••••••••••••••••••••••••••••••••••• 16
5-2 Parameter Setup•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 17
■
Setting operation ••••••••••••••••••••••••••••••••••••••••••••••••••••••• 17
■
Parameter setup item list ••••••••••••••••••••••••••••••••••••••••••••••• 18
Chapter 6. MAINTENANCE AND TROUBLESHOOTING
■
Remedying trouble ••••••••••••••••••••••••••••••••••••••••••••••••••••• 20
■
How to replace the fuse••••••••••••••••••••••••••••••••••••••••••••••••• 21
Chapter 7. SPECIFICATIONS
■
Common specifications• •••••••••••••••••••••••••••••••••••••••••••••••• 22
■
Individual specifications•••••••••••••••••••••••••••••••••••••••••••••••• 23
■
Pressure loss for air •••••••••••••••••••••••••••••••••••••••••••••••••••• 25
■
External dimensions•••••••••••••••••••••••••••••••••••••••••••••••••••• 26
iv
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Chapter 1. INTRODUCTION
■
Introduction
■
Features
The CMG gas flow monitor is a flowmeter for measuring the fuel flow rate of gas
burners that use a Micro Flow sensor chip, a thermal flow speed sensor made
using Yamatake proprietary technology.
The CMG displays and outputs the volume flow rate in a standard state* and does
not require conversion for temperature and pressure.
The CMG has the following functions: instantaneous flow rate display, integrated
flow rate display, alarm contact output, instantaneous flow rate output according to
analog output, integrated pulse or event output according to open collector output.
These functions enable detailed air-fuel ratio management of burners and flow rate
management of units.
* Factory setting is 32˚F, 1 atmosphere (The reference temperature can be
selected from 41˚F, 50˚F, 59˚F, 68˚F and 77˚F, according to the function
settings.)
•
Installation of the compact and high-precision CMG is simple. It can be
mounted in any direction, as the direction of the display can be changed.
•
Gas flow rate can be measured and managed easily on the digital flow rate
display and Hi, Lo, OVER and ALARM LED displays.
•
Display on panels and flow rate management can be performed easily using
output of the gas flow rate upper/lower limit settings and analog output of
instantaneous flow rate.
•
Fuel usage can be easily understood because the instantaneous flow rate and
integrated flow rate displays can be switched by one-touchoperation.
The total flow rate since this device was installed can be displayed.
•
Compensation of display values is not needed even if temperature and pressure
change as the measurement method used is massflow.
•
A bypass structure using an orifice enables low pressure loss, and prevents the
influence of mist, etc.
•
Self-diagnostic functions simplify remedies during troubleshooting.
1
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Chapter 1. INTRODUCTION
■
Model selection guide
CMG
●
Natural gas (13A) model (LNG CH4: 88%)
Talble
Selection
Description
Model Number
CMG
Gas Flow Monitor
I
Piping size
15
O
—
—
—
1/2 inch
25
—
O
—
—
1 inch
40
—
—
O
—
1-1/2 inch
50
—
—
—
O
1/2 inch
II
Connection method
2
O
O
O
O
NPT thread
III
Gas type
N
O
O
O
O
Natural gas
IV
Flow range
015
O
—
—
—
150 CFH(normal) *1
100
—
O
—
—
1,000 CFH(normal) *1
250
—
—
O
—
2,500 CFH(normal) *1
500
—
—
—
O
5,000 CFH(normal) *1
V
Output
1
O
O
O
O
4 to 20mA + Event
VI
Operating pressure
0
O
O
O
O
0 to 14.5psi (100kPa)
VII
Option-1
0
O
O
O
O
None
VIII
Power supply
0
O
O
O
O
24 Vdc
IX
Option-2
0A
O
O
O
O
Fixed
●
Air model
Talble
Selection
Description
Model Number
CMG
Gas Flow Monitor
I
Piping size
15
O
—
—
—
1/2 inch
25
—
O
—
—
1 inch
40
—
—
O
—
1-1/2 inch
50
—
—
—
O
1/2 inch
II
Connection method
2
O
O
O
O
NPT thread
III
Gas type
A
O
O
O
O
Air
IV
Flow range
015
O
—
—
—
150 CFH(normal) *1
100
—
O
—
—
1,000 CFH(normal) *1
250
—
—
O
—
2,500 CFH(normal) *1
500
—
—
—
O
5,000 CFH(normal) *1
V
Output
1
O
O
O
O
4 to 20mA + Event
VI
Operating pressure
0
O
O
O
O
0 to 14.5psi (100kPa)
VII
Option-1
0
O
O
O
O
None
VIII
Power supply
0
O
O
O
O
24 Vdc
IX
Option-2
0A
O
O
O
O
Fixed
*1 "Normal" refers to the volumetric flow rate (CFH) after converting to 32˚F, 1 atmosphere.
2
IX
VIII
VII
VI
V
IV
III
II
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Fuse
M3.5 (6) terminal screws
EVENT2 4
Chapter 2.
NAMESANDFUNCTIONS OFPARTS
Lo indicator:
Blinks when the lower limit alarm occurs.
Hi indicator:
Blinks when the upper limit alarm occurs.
OVER indicator:
Lights when the flow rate exceeds the
measurement range. Blinks when
the integration event occurs.
CF indicator:
Lights during integrated flow rate display.
Goes out during total flow rate display.
Blinks once at each pulse output.
CFH indicator:
Lights during instantaneous flow rate
Alarm indicator:
Blinks when an alarm occurs.
Display:
Displays the instantaneous flow rate value,
integrated flow rate value, total flow rate
value, function setting values and parameter
setting values on a in 7-segment LED
display.
RESET key:
Use this key to reset alarms/integrated flow rate.
/ALARM
RESET
ENT
display. DISP key:
Use this key to switch between
instantaneous flow rate display and
integrated flow rate display, and from
setup mode to instantaneous flow rate
display.
key:
Use this key to increment a value.
key:
Use this key to decrement a value.
Also use it to switch to the function
setup mode.
key:
Use this key to feed digits when changing setting
values. Also use it to move to the parameter
setup mode.
Operation unit cover:
Open this cover to configure or reset
various settings.
Wiring hole:
There are two wiring holes.
Insert the plug and seal packing
(provided) in the unused hole
Outlet:
This is where the fluid
to be measured flows out.
Operation panel:
Use this panel to set functions,
parameters, alarms or alarm occurrence
wait time, and to reset alarms or reset
the integrated flow rate.
ENT key:
Use this key to fix and store settings to
memory. Also use it to display total
flow rate, or to switch to the function
setup mode.
Sensor/terminal section:
Houses the Micro Flow sensor chip
amplifier and wiring terminal plates.
Inlet:
This is where the fluid to be measured
flows in.
Flow path:
The fluid to be measured flows
through the flow rate.
Fuse position
3
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Chapter 3. MOUNTING AND WIRING
WARNING
When using combustible gas, install the device upstream of the safety
shut off valve. If air somehow enters the piping, and the sensor makes a
spark due to some cause like a lightning strike when an explosive mixture is
present, an explosion could occer inside the pipe.
On flanged models, do not use the device or installed pipes as a footrest.
Doing so might damage the device or piping, or cause a slip which might
result in injury.
Flanged models are heavy. Dropping them on your feet may cause injury.
Handling Precautions
•
When carrying the device, hold it by the flow path section. Holding it by
the sensor/terminal section may damage the device.
•
This device is a precision instrument. Do not drop it or subject it to
shock. Doing so might damage the device.
•
If the CMG model has a threaded pipe connection, when connecting the
piping fasten the flow inlet/outlet section, and then screw in the pipe side
to connect the piping.
•
When connecting a flanged device, first check that the piping is not tilted
or off center before installing. Failure to do so might causeleakage.
•
Topreventvibrationofthedevice,attachthepipesecurely.
•
Do not peel the protective seals from the display before use. When
performing work on the device, tools may accidentally bump against the
display and scratch it.
•
When using the device outdoors, mount it out of the direct sunlight and
in a location where it is not splashed directly by rain.
•
When mounting the device in locations where rust, oil mist or dust and
powder exists, be sure to provide a strainer or filter upstream to prevent
foreign matter from entering the device. Foreign matter flowing into the
device might result in faulty operation.
•
When wiring the device, take care not to tug on the display. The internal
connections might become damaged.
•
Wire 4-20mA output and open collector output separately from the
power line and power supply leads. Do not wire these outputs in the
same conduit as the power line and power supply leads. Doing so might
cause malfunction.
•
Install a switch for shutting off the main power to the device within reach
of the person operating the device.
•
The common mode voltage between output and ground should be less
than 33V RMS, 46.7V at peak or 70Vdc, excluding power supply and
relay contact output.
4
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Gas
Gas
Chapter 3. MOUNTING AND WIRING
■
Mounting
●
Installation site
Avoid mounting the CMG in locations characterized by the following:
1. Operating temperatures that fall below 14˚F and rise above 140˚F
2. Operating humidity that exceeds 90%RH
3. Sudden changes in temperature and condensation
4. Corrosive gases and flammable gases
5. Abundant conductive substances (e.g., dust, salt or iron dust) or organic
solvents
6. Vibration or shock
7. Direct sunlight
8. Direct splashing by rain or water
9. Splashing by fluids (e.g., oil, chemicals)
10.Strong magnetic or electrical fields
11. Where there is a pulsating flow.
1)
One cause is flexible piping (regardless of the material) with an accordion-
shape inner surface and a length of 500mm or more. Flexible piping (such as a
rubber hose) with a flat inner surface does not causepulsation.
2)
Another cause is a reciprocating or rotary type gas booster or a flow meter
having rotary motion like a Roots meter.
12.Where soot or moisture generation in the piping is expected due to fluctuation
in gas composition, etc.
●
Gas flow
Handling Precautions
Make sure that the gas flows into the device in the direction indicated
by the FLOW arrow on the side of the flow path.
Otherwise, the flow rate cannot be measured correctly.
5
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Chapter 3. MOUNTING AND WIRING
■
Pipes
●
Precautions for piping installation
This device is a precision instrument. If foreign matter such as dust, oil mist or
water enters the device, it may cause measurement error or faulty operation. When
installing piping, be sure to follow the procedures below to prevent foreign matter
from entering the device.
1.
Beforeinstallingthedevice,be
suretoflushtheupstreamand
downstreampipingthoroughly
to removeweldingfume
particulate anddust.
CMG
2. Be sure to wipe theinside
Upstream sideof
piping
Downstream side of
2.
piping
of the pipe to be directly connected to this device.
3.
After the above two operations are complete, check to be sure that there is no
welding fume particulate or dust, and then install thedevice.
Handling Precautions
If foreign matter cannot be fully
eliminated by flushing or wiping, or if the
regular presence of foreign matter canbe
expected, be sure to install a filter. If
dust, oil or moisture adheres to the Micro
Flow sensor chip, measurement error or
faulty operation may result.
Micro Flow
sensor chip
●
Straight pipe section
To be sure the straight pipe section is long enough, refer to pages 23-24.
6
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Chapter 3. MOUNTING AND WIRING
●
Mounting position
CAUTION
•
Do not mount so that the display is facing down. Doing so might cause error
or other malfunction.
•
This device can be used with the display facing up ±90°.
Right Right Right Wrong
Handling Precautions
The length of the required straight pipe connection varies according to
the model number. For details,
see ■ Individual specifications (page 23).
●
Screw connection
●
Coating sealant
Coat with an appropriate amount of sealant. Do not coat the top two threads of
the screw.
Remove any dirt, burrs or piping cutting oil from inside the pipes.
Handling Precautions
Do not overdo the sealant, and do not allow dirt, burrs or piping cutting
oil to enter the pipes, as this might cause measurement error.
Good example Bad example
7
Sealant
Sealant
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Chapter 3. MOUNTING AND WIRING
●
Connecting pipes
Connect pipes while gripping the hexagonal section of the pipe connection port
on the body with a wrench.
Pipe
Handling Precautions
•
Do not grip the display or sensor/terminal section. Doing so might
damage the body or cause leakage.
•
Do not tighten the pipe at a torque that exceeds themaximum
tightening torque.
Model No.
Max. Tightening Torque
CMG152
50N • m
CMG252
125N • m
CMG402
200N • m
CMG502
250N • m
8
Pipe connectionport
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Chapter 3. MOUNTING AND WIRING
■
Wiring
CAUTION
Prevent the load connected to the output terminal from exceeding the rating
indicated in the specifications. Failure to do so might cause damage.
Be sure to check that the wiring is correct before you turn the power ON.
Incorrect wiring might cause damage or malfunction.
The following table describes the meaning of symbols indicated on the terminal layout label on the CMG:
Symbol
Meaning
Direct current
●
Removing the operation panel/display
Required tool: Phillips screwdriver
(1)
Loosen the four screws on the operation panel/display using the Phillips
screwdriver.
(2)
Gently lift up the operation panel/display, and disconnect its power lead
connectors.
●
Wiring
Internal circuit CN1
Terminal 1:
Terminal 2:
24Vdc +
-
COM
Terminal 3: OUTPUT 4 to 20mAdc output
Terminal 4:
Terminal 5:
Terminal 6:
EVENT2
RELAY
RELAY
Open collector output
*
*: A DC power supply can also be
used for the load that is wired to
terminals 5 and 6.
d
Relay output
Terminal No.
Signal Name
Description
1
24Vdc
Power supply
2
COM
Common
3
OUTPUT
Analog output 4 to 20mAdc
4
EVENT2
Event output 2 NPN open collector, integrated pulse
5
RELAY
Event output 1 contact output (relay output)
6
RELAY
Event output 1 contact output (relay output)
9
d
Loa
Loa
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CCW rotation max. 180
CW rotation max. 180
Operation panel/
display
Connector leads
Combination No. indication
Sensor/terminal
section
Chapter 3. MOUNTING AND WIRING
Handling Precautions
•
Use crimped terminal lugs, which enable a reliable connection to
terminals.
•
Use crimped terminal lugs that are compatible with M3.5screws.
•
Limit the terminal screw tightening torque to 0.8N•m.
•
Use a JIS C 3401 control cable (CVV, etc.) of maximum outer diameter
of 2.2mm for wiring.
•
If waterproofing is required, be sure to use the seal connector
(Yamatake model: PA4-N2, PA4-N4 or equivalent product) for reliable
sealing.
•
When wiring to terminal 2 (COM), wire the analog output lead separately
from the power lead. Otherwise, a voltage drop caused by the power
current may influence the accuracy of the analog output.
•
Take care that event output 2 (the open collector output) does not
exceed the output rating of this device. When driving a relay, be sure to
use one with a built-in coil surge absorption diode. Failure to do so might
cause faulty operation.
●
Mounting the operation panel/display
On this device, the operation panel/display can be rotated up to 180˚ to an easy-
to-view position. Follow the procedure below to mount the operation
panel/display:
(1)
Connect the connectors of the leads from the operation panel/display to the
sensor/terminal section.
(2)
Rotate the display to the most easily visible position.
(3)
Fasten the operation panel/display onto the sensor/terminal section withscrews.
10
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Chapter 3. MOUNTING AND WIRING
Handling Precautions
•
The maximum screw tightening torque is 1.0N•m. The IP54 seal might
be impaired if screws are too tight or too loose.
•
Arrange the leads connecting the sensor/terminal section and the
operation panel/display so they are not unnecessarily twisted or pinched
when fitting the sections together.
•
Prevent the leads connecting the sensor/terminal section and the
operation panel/display from being damaged.
•
Do not rotate the operation panel/display beyond 180˚ to the left or right.
This section may be rotated to the left or right if it is mounted upside
down.
•
Use an operation panel/display and a sensor/terminal section with the
same combination of combination numbers.
Combination numbers differ from device to device as each device is
adjusted individually. If different combination numbers are combined,
accuracy can no longer be guaranteed. The combination numbers are
each displayed on the operation panel/display and sensor/terminal
section.
11
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1
Integrated flow rate past
the decimal point
DISP key
key
DISP key
or
DISP key
When integrated flow rate is
10000CF or more
Instantaneous
flow rate
Integratedflowrate
last four digits
DISP key
Integratedflowrate
first four digits
key
DISP
When integrated flow rate is
9999CF or less
Power ON
DISP
Chapter 4. OPERATION
CAUTION
Do not operate the keys with a mechanical pencil, screwdriver or other
sharp-tipped object. Doing so might damage the keys.
■
Displaying the flow rate
The following values can be alternated on the 4-digit, 7-segment LED display:
1. Instantaneous flow rate
2. Integrated flow rate
The following shows the operation flow for displaying the flow rate:
Hold down key for at least five seconds.
key
●
Displaying the instantaneous flow rate and integrated flow rate
When the power is turned ON, the CFH indicator lights to indicate the
instantaneous flow rate. To display the integrated flow rate, press the DISP key.
•
The CF indicator lights to indicate the integrated flowrate.
•
The display is a 4-digit display. However, the integrated flow rate is
displayed as eight digits, divided into the first four digits and the last four
digits. In all, an integrated flow rateup to can be displayed.
•
When the last four digits are displayed, the decimal point lights to the right
of the last digit.
When the integrated flowrate is CF or less, pressing the DISP key again
returns the display to the instantaneous flow rate display. When the integrated flow
rate is
1
CF or more, pressing the DISPkey displays the first four digits of the
integrated flow rate.
You can also alternately display the first four digits and the last four digits by
repeatedly pressing the key.
For example, if initial reading is
1
and the 2nd reading is_ _ , the integrated
flow rate is_ _ CF.
If the DISP key is held down for at least five seconds when switching to the
integrated flow rate display from the instantaneous flow rate display, digits past
the decimal point for the integrated flow rate are displayed.
12
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RESET
Chapter 4. OPERATION
Handling Precautions
•
When the flow rate exceeds the upper limit of the measurement range,
the OVER indicator light, and goes out after the flow rate returns to
within the measurement range.
•
The integrated flow rate factory setting is .
•
The integrated flow rate indicationreturns to after 99999999 is
exceeded.
•
The flow rate is integrated even if the flow rate is outside of the
measurement range. Regard integrated values as a means for grasping
the whole quantity of flow.
■
Resetting alarms
When a flow rate alarm detection condition is selected (an item from 1 to 5 in
function setup item C- ; see page 19), an alarm is set.
To reset the alarm, press the RESET key.
The alarm indicator goes out, and the alarm output relay turns OFF.
Handling Precautions
Alarms are also reset by turning the power OFF.
The alarm recurs after the alarm occurrence wait time when the flow rate
exceeds the preset alarm value after the flow monitor is re-energized.
■
Resetting the integrated flow rate
Hold the key down for at least two seconds while the integrated flow rate is
displayed.
The integrated value becomes .
Handling Precautions
Holding down the RESET key for two seconds or more while an alarm is
occurring merely stops the alarm; it does not reset integrated values. In
this case, reset the alarm after the flow rate has returned to within the
preset alarm range, and then hold down the RESET key again for two seconds
or more.
13
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DISP
Chapter 4. OPERATION
■
Displaying the total flow rate
This function displays the total flow rate since the device was installed.
Reset cannot be performed by the same reset operation used for integrated flow
rate.
(1)
Press the key until the integrated flow rate is displayed.
The CF indicator lights.
(2)
Hold the key for one second or more.
The CF indicator goes out, and the total flow rate is displayed for 5
seconds.
The total flow, like the integrated flow rate, is displayed in the divided
upper four digits and lower four digits, in total 8 digits capable of
displaying the maximum CF.
After that, the CF indicator automatically lights, and the display returns to
the integrated flow rate display.
(3)
Press the DISP key again within five seconds while it is displayed.
The first four digit display.
You can also alternately display the first four digits and the last four digits by
using the key repeatedly.
Handling Precautions
•
The total flow rate indicationreturns to after is exceeded.
•
Integrated flow rate and total flow rate values are held in memory even if
the power is turned OFF.
On models that display values down to two digits past the decimal point,
data is written into memory when the ones digit changes or one hour
after the previous writing.
On models that display values down to one digit past the decimal point,
data is written into memory when the tens digit changes or one hour
after the previous writing.
Integrated values that have not been written to memory are discarded
when the power is turned OFF.
•
The total flow rate reset setting can be configured to either the enabled
or disabled condition using the function setup.
•
If the "Reset is performed by key switch" setting has beenselected,
press the
rate.
RESET key for 2 seconds or more while displaying the total flow
The total flow rate and integrated flow rate will be reset and initialized to
"0."
14
This manual suits for next models
1
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