Aichi Tokei Denki TBX30 User manual

Sensors, Systems & Service Aichi tokei denki co., ltd.
Instruction Manual
For Gas Management & Control
Turbine Gas Meter
Built-in battery Type: TBX30, TBX100, TBX100F, TBX150F
External Power Source Type: TBX30D, TBX100D, TBX100FD, TBX150FD
Thank you for purchasing this product.
Please read through this instruction manual carefully and use the product properly.
The warranty is on the back cover. Please review the content and keep it for future
reference.
Warranty included
Reliability Creativity Service
TBX30D
(External power
source type)
TBX150F
(Built-in battery
type)

1
1 Indications used in this instruction manual
...........................................................1-2P
2 Precautions for use ...........................2-3P
3 For proper use...................................3-4P
4 Main body and structure....................5-6P
5 Specifications .......................................7P
6 External output .....................................8P
7 Outside dimensions..............................9P
8 Service life............................................9P
9 External connection.......................10-11P
10 Instructions for installation and piping work
...................................................... 12-13P
11 Functions ...................................... 14-18P
12 Instructions for the beginning of use ..19P
13 Instructions for inspection...................19P
14 Remote indicator (optional) ................20P
15 Characteristic data (reference)...........21P
16 Troubleshooting..................................22P
17 Warranty and after-sales service contact
information.............................. Back cover
1 Indications used in this instruction manual
For proper use of the turbine gas meter for management and control, this instruction manual
contains various pictograms intended to prevent injuries to you and other people or damage to
property. Those pictograms and their meanings are listed below. Please understand the details
before reading the body text.
Indication Meaning Page
Danger Failure to follow this instruction may pose an imminent
risk of death or serious injury of the user. None
Warning Failure to follow this instruction may pose a risk of
death or serious injury of the user. None
Caution Failure to follow this instruction may pose a risk of
injury of the user or damage to property. 2
The meanings of
the pictograms
are as follows:
General
caution
Do not touch General
prohibition
Do not
disassemble
No fire Do
Pages 2491419 – 24 2 – 234
Contents

2
2 Precautions for use
Caution
1. Do not install the product at a dangerous place.
Do Not
Do not use the product for applications to which a high level of safety is required,
such as nuclear power, railway, aviation, vehicle, and amusement applications.
The electric circuits in this turbine meter do not have an anti-explosion structure.
2. Do not use this product for the measurement of corrosive gases or
the gases listed below.
Do Not
It may corrode parts in use or cause a leakage of gas. In addition, the
measurements can be inaccurate.
Chlorine, hydrogen cyanide, nitrogen dioxide, fluorine
Toxic gases Hydrogen chloride, boron trifluoride, boron dioxide
Sulfur dioxide, hydrogen fluoride, hydrogen sulfide
Others Ammonia, chlorine dioxide, oxygen, hydrogen, helium
Depending on the property of the gas to be measured, the meter may become
deteriorated in performance or damaged. Contact us before measuring a special
gas.
3. Do not give an impact to the meter.
Do Not
The meter is a precision measuring
instrument. Do not give a strong impact to
the meter or hit the meter with an object.
Besides, do not insert a cylindrical object
into the meter. It may cause a leakage of
gas or damage.
4. Do not disassemble the meter.
Do not
disassemble
The meter is a precision measuring
instrument. Do not disassemble it. It may
cause a leakage of gas.
5. Conduct an airtightness test to the installed meter, including the
pipes located prior and subsequent to it.
Do
Check that no leakage occurs at a
pressure 1.1 times larger than the
maximum allowable working pressure.
6. Connection to an external power source (applicable for the external
power source type)
Do
Use caution not to make a short circuit when connecting the external connection
cable to a power source.
The power source used should be an isolation type having a short-circuit protection
function.
Conduct an airtightness test
between these
p
oints.
Strainer Meter

3
7. Disposal after use
Do
Never dispose of the meter through a general waste processing route because a
lithium battery is embedded inside (applicable for the Built-in battery type).
Never throw the meter into a fire. It may ignite or explode.
3 For proper use
1. Be sure that the gas the customer is going to use agrees with the
specifications shown on the nameplate.
Do
2. The orientation markings on the main body of the meter must be the
same as the direction of the gas flow.
Do
3. Straight pipes having a length of 10D (i.e. 10 times the pipe diameter)
or greater must be provided prior and subsequent to the main body of
the meter.
Do
4. A strainer must be installed upstream from the meter.
Do
Model Flow rate
range
Output pulse unit
Unit pulse [High-density pulse] Date of
manufacture Serial number
Inlet pipe
Gas flow
Side view
Orientation
markings Gas flow
Outlet pipe
Meter D: Pipe diamete
r
Strainer with a 200 mesh Meter
Gas flow

4
5. Do not install the meter at a place where oil mist or powder of dust is
wafting.
Caution
1. Use the meter in a condition in which the generation of oil mist due to
reliquefaction can be avoided. Oil mist that adheres to inside the flow rate meter
may cause errors in flow rate measurement, hindering accurate measurement.
2. When the meter is used for a dry gas (e.g., 13A gas), the powder of dust (foreign
particles) in the pipes may cause a failure in the rotating part, hindering accurate
measurement.
6. Do not tighten the flange-stuffing nuts too strong when installing the
meter.
Do Not
Fasten all the nuts softly before tighten
them in an even, crisscross pattern
(applicable for TBX100F (D) and
TBX150F (D)).
Tightening torque 100 Nm max*
* Secure the minimum design fastening pressure recommended by the gasket
manufacturer. Depending on the use conditions, the fastening torque may have to be
controlled at a pressure exceeding the minimum design fastening pressure.
7. When connecting the meter to a counter pipe, align the centers.
Do
Use caution not to cause an eccentricity,
inclination, or twist.
Do not apply an excessive stress loading
to the main body of the meter. (applicable
for TBX100F (D) and TBX150F (D)).
8. When using newly installed pipes, purge the pipes for removing foreign
objects before installing the meter.
Do
LP gas
Oil mist
Meter
Meter
13A gas
Powder of dust
Remove weld tips
and foreign objects.

5
4 Main body and structure
1) Checking the content of the package
Check the following items when this product is delivered.
1. Check the model name to make sure it is the product you have ordered.
2. Check the appearance to make sure the product is not broken.
3. Verify the accessories with the specifications.
The accessories are listed in the following table.
After you have unpacked the product, great care should be taken not to lose or break the
accessories.
Should your product have a defective or different item, contact your nearest branch office
or sales office.
Name or model
A
ppearance Quantity Remarks
Built-in battery
type External power source type
Standard items
Turbine meter main
body 1
For the model name,
refer to the item
codes.
External connection
cable (6 wires, 5 m)
TBXD-SS-BC
1
This cable cannot be
used with an Built-in
battery type product
because of the
difference in the
number of contacts of
the connector.
Instruction manual 1
Optional items
External connection
cable (4 wires, 2 m)
TBX-SS-B
1
This cable cannot be
used with an external
power source type
product because of
the difference in the
number of contacts of
the connector.
Terminal box
TBXD-SS-B 1
Ten pieces of round
type crimp terminals
(J.S.T. R1.25-3) are
included.

6
2) Names of parts
Turbine meter main body
3) Item code
Basic type Capacity Connection
type Power source / Flow direction Connection diameter Description
TBX TBX
30 30 (Screw type only)
100 100 (Screw type and flange type)
150 150 (Flange type only)
Not indicated Screw type
F Flange type
Not indicated Built-in battery type
D External power source type
/
L Left inlet (left to right)
R Right inlet (right to left)
U Bottom inlet (bottom to top)
D Top inlet (top to bottom)
3 32A (Rc 11/4)
4 40A (Rc 11/2)
Integrated flow rate display
Instantaneous flow rate display
Trip flow rate display
* Switchable dis
p
la
y
Pilot
External connection cable
* Built-in battery type: 4-wire type
External power source type: 6-wire type
Instantaneous flow rate switch
Trip flow rate switch
Main body nameplate
* The external power source type
product is indicated with "TBX-D."
Expiration date
TBX100F
(
D
)
onl
y
TBX30 (D) only

7
5 Specifications
Model TBX30(D) TBX100(D) TBX100F(D) TBX150F(D)
Flow rate range (m
3
/h) 4 – 30 10 – 100 10 – 100 12.5 – 150
Maximum allowable
working pressure (kPa) 100
Withstanding pressure
(kPa) 150
Accuracy ±1% FS
Display
Integrated LCD display:
8 digits Minimum readout value: 0.01 m3
LCD display:
8 digits
Minimum readout
value: 0.1 m3
Trip LCD display:
6 digits Minimum readout value: 0.01 m3
LCD display:
6 digits
Minimum readout
value: 0.1 m3
Instantaneous
LCD display:
3 digits
Minimum readout
value: 0.1 m3/h
LCD display: 4 digits
Minimum readout value: 0.1 m3/h
LCD display:
3 digits
Minimum readout
value: 1 m3/h
Flow direction Left inlet
(L)
Right
inlet (R)
Left inlet
(L)
Right
inlet (R)
Top and bottom,
left and right (free)
Left inlet
(L)
Right
inlet (R)
Connection diameter Rc 1
1
/4, Rc 1
1
/2Rc 2 JIS 10K Flange 50A
Operating temperature
range (°C) -10 to +60
Installation angle Horizontal and vertical
Measurable gas
*1
City gas
*2
, LP gas
*2
, air, nitrogen
Power
source
Built-in battery
type Lithium battery
External power
source type
12 to 24 VDC ±10%, supplied via the external connection cable,
power consumption: 0.19 W max, current consumption: 7 mA*3
Output signal Open drain output 2 ch (unit pulse and high-density pulse)
Installation location Indoor
Material Aluminum allow Cast iron Aluminum allow
Weight
(kg)
Built-in battery
type Approx. 0.9 Approx. 1.6 Approx. 7.0 Approx. 2.5
External power
source type Approx. 1.0 Approx. 1.7 Approx. 7.1 Approx. 2.6
Acquired
standard
Built-in battery
type (except for
TBX100F)
EN 61000-6-4:2007+A1:2011
EN 61000-6-2:2005
*1 Do not use corrosive gases. Refer to "Precautions for use" for details.
*2 Do not install the meter at a place where oil mist or powder of dust is wafting.
*3 Average value at the standard condition.

8
6 External output
This turbine meter is equipped with two open-drain outputs*1.
To extract the outputs, use the dedicated external connection cable with a plug.
Standard specifications
Model TBX30(D) TBX100(D) TBX100F(D) TBX150F(D)
Unit pulse
Pulse output unit 10L/P 100L/P
Pulse output width 40ms
Maximum ON current 20mA
Maximum ON
resistance*2 50Ω
Maximum frequency
*3
Approx. 0.8 Hz Approx. 2.8 Hz Approx. 0.4 Hz
High-density
pulse
Pulse output unit Approx. 110
cm3/p Approx. 250 cm3/p Approx. 470 cm3/p
Minimum pulse output
width Approx. 13 ms Approx. 9 ms Approx. 11 ms
Maximum ON current 10 mA
Maximum ON
resistance*2 100 Ω
Maximum frequency Approx. 75 Hz Approx. 110 Hz Approx. 90 Hz
Maximum applied voltage 24 VDC
*1 Unit pulse: A flow rate pulse after the unit matching by an arithmetic circuit
High-density pulse: A flow rate pulse that is output in synchronization with the rotation of the impeller
Duty ratio: 0.45 to 0.55 (at a constant flow rate)
*2 The OFF resistant is 100 kΩor more.
*3 The maximum frequency with the standard specifications. The maximum frequency varies with the
pulse output unit that has been set.
Note that the maximum frequency will be approximately 8 Hz when the pulse output unit of TBX30 (D)
is set to 1 L/P.

9
7 Outside dimensions
8 Service life
Name Standard
service life Remarks
Turbine meter main
body 7 years
Caution
The service life could be shortened when oil mist or
powder of dust flows into the pipes or when the
meter is used continuously at a rate exceeding the
maximum flow rate for a long time.
Lithium battery*1 7 years
Caution
The battery life could be shortened when the meter
is continuously used in high-temperature
environments (approx. 60°C).
The battery cannot be replaced.
*1 Applicable only for Built-in battery type products.
When the remaining battery life becomes less than about one month, a running-down battery alarm
function will be activated, in which the most significant digit of the integrated flow rate display blinks.
(The duration until the rundown of the battery varies depending on the environment and the duration of
use.)
The direction of the indicator of
TBX100F (D) can be freely adjusted to
accommodate to the inflow direction o
f
the gas. In addition, the indicator can
be detached to be used as a remote
display.
Model
External
dimensions

10
9 External connection
1) Built-in battery type
Use the dedicated external connection cable (optional) to extract the external pulse output
signals (open drain).
For the connection between the meter main body and the indicator, connect the signal
wires of the indicator to the terminal box of the external connection cable (4 wires, 2 m) as
follows.
Standard specifications
Name Specification
External connection cable Heat resistance vinyl chloride 6 core shield wire
UL20276SB AWG26 (4 cores are only used)
Terminal box For indoor communication wires, 4 terminals
2) External power source type
- External connection cable
Use the dedicated external connection cable to supply a 12 to 24 VDC power and extract
the external pulse output signals (open drain).
For the connection between the meter main body and the indicator as well as a 12 to 24
VDC power source, connect the lead wires and power lines of the external connection
cable (6 wires, 5 m) and the signal wires of the indicator as follows.
External connection cable (2 m)
Wire color Description
Black High-density pulse (-)
White High-density pulse (+)
Green Unit pulse (-)
Red Unit pulse (+)
Terminal box (outside)
White Black
Red Green
Terminal box (inside)

11
Standard specifications
Name Specification
External connection cable Oil-proof round PVC cord 0.2 mm
2
x 6 wires
Terminal box For indoor communication wires, 4 terminals
- Input/output circuit diagram
Be sure to interrupt the supply of
external power while performing
wiring.
External connection cable (5 m)
Wire color Description
Red
Black
White
Blue
Yello w
Green
Power supply 12 to 24 VDC
Power GND
Unit pulse (+)
Unit pulse (-)
High-density pulse (+)
High-density pulse (-)
- Terminal box (optional)
The terminal box is used when the external connection cable and the indicator are
connected indirectly.
Select and connect the power lines and output wires to be used, as necessary.
Terminal box (outside)
Terminal box (inside)
(Yellow) High-density pulse (+)
(Green) High-density pulse (-)
(White) Unit pulse (+)
(Blue) Unit pulse (-)
(Red) Power source (+)
(Black) Power source (-)
Main circuit

12
10 Instructions for installation and piping work
1. This turbine meter is designed for indoor installation. Install it at a place that is not splashed
with rainwater.
2. This turbine meter can be used with both horizontal pipes and vertical pipes. Install it in the
middle of a straight pipe section.
3. Do not install this turbine meter at a place where liquid such as oil or water may accumulate.
4. Install a strainer (200 mesh) upstream from this turbine meter (see page 3).
5. Do not install this turbine meter at a place where oil mist or powder of dust is wafting. It may
cause a failure in the rotating part, hindering accurate measurement (see page 4).
6. Do not install this turbine meter to equipment that generates pulsatory motion, such as a
gas engine. The measurement will be inaccurate.
7. Straight pipes having a length of 10D (i.e. 10 times the pipe diameter) or greater must be
provided prior and subsequent to this turbine meter.
8. Use caution not to let foreign objects such as weld tips, foreign objects, and sealant enter
during the installation of pipes.
9. Do not install this turbine meter at a place where it is subjected to an impact pressure.
10. Place noise sources, such as a control device of electromagnetic valves and power lines,
one to two meters away from the meter main body and the external connection cable.
11. The direction of the indicator against the pipes is selectable.
12. Connect a 12 to 24 VDC power source when this turbine meter is the external power source
type. On that occasion, use caution not to make a short circuit. The power source used
should be an isolation type having a short-circuit protection function.
(1) In case of TBX30 (D)
(1) On installation
Secure the connection unit first, and then screw pipes with tapered external threading into
both ends of the meter.
(2) On maintenance
1. Remove the bolts (8 pcs.) located outside of the connection unit, and then you can
take out the body perpendicular to the pipes.
2. Replace the O ring with a new one, apply grease on it, and insert the meter to the
pipes.
Bolt (8 pcs.)
Pipe
Connection unit

13
(2) In case of TBX100F (D)
The direction of the display of this product can be freely adjusted to accommodate to the inlet
direction of the gas. In addition, the display can be detached to be used as a remote display.
1. Remove the "bolt with a hexagon hole" located at the side of the display.
2. A. Secure the mounting plate on a wall. (Use the attached screws.)
B. Rotate the counter 180 degrees.
C. Rotate the mounting plate 90 degrees to secure it. (Use the attached screws.)
3. Secure the counter again.
The display can have an angle up to approximately 10 degrees.
A. Remote display
A
fter installing the meter with the orientation
markings on the main body aligned to the inflow
direction of
g
as, follow the
p
rocedure above.
Inflow direction of gas
Direction to
recognize the display
Mounting plate
Mounting plate
Mounting plate
Mounting plate (to be rotated)
φ3.2 mounting
screw hole
B. Right inlet C1. Top inlet C2. Bottom inlet

14
11 Functions
Caution
When operating the switches, be careful not to place firm pressure on them with a hard
object such as a mechanical pencil and screwdriver because it may cause a failure of the
switches. Press them with a soft object, such as the tip of a finger.
Normal mode and constant display mode
Category Model
Name TBX30 (D) TBX100 (D)
TBX100F (D) TBX150F (D)
Switch
part
Instantaneous flow
rate switch
While an integrated flow rate value is displayed:
Pressing the switch (for less than one second) will display an instantaneous flow rate value.
Thirty seconds later, the display will automatically return to an integrated flow rate value.
While an instantaneous flow rate value is displayed:
Pressing and holding the switch (continuously for one second or longer) will change the
display to the previous one prior to the latest switching (instantaneous flow rate display or
trip flow rate display).
When the display changes to a trip flow rate value, the value will not be reset.
While a trip flow rate value is displayed:
Pressing the switch (for less than one second) will display an instantaneous flow rate value.
Thirty seconds later, the display will automatically return to a trip flow rate value.
Trip flow rate switch
While an integrated flow rate value or instantaneous flow rate value is displayed:
Pressing the switch (for less than three seconds) will display an integrated flow rate value
from the moment (trip flow rate).
While a trip flow rate value is displayed:
Pressing the switch (for less than three seconds) will reset the trip flow rate value. Pressing
and holding the switch (continuously for three seconds or longer) will change the display to
an integrated flow rate value.
Instantaneous
flow rate switch
+
Trip flow rate
switch
While an integrated flow rate value, instantaneous flow rate value, or trip flow rate value is
displayed:
Pressing and holding the switches together (continuously for four seconds or longer) will
change the mode to the constant display mode.
Pressing and holding the switches together (continuously for ten seconds or longer) will
change the mode to the inventory mode. (*)
Constant display mode:
Pressing and holding the switches together (continuously for ten seconds or longer) will
change the mode to the inventory mode. (*) For details, refer to 1) Constant display mode
through 4) Pulse output setting conditions.
Inventory mode (*)
Pressing and holding the switches together (continuously for two seconds or longer) will
change the display to an integrated flow rate value. For details, refer to 5) Inventory mode.
Display
part
Integrated flow rate
(m3)
Instantaneous flow
rate (m3/h)
Trip flow rate (m3)
Pilot Blinking
Indicates that a gas is measured when it is
flowing.
The lamps repeatedly turn on from the left.
Normal mode
Press and hold for 1
second, or let stand
for 30 minutes
Instantaneous
flow rate dis
p
la
y
Integrated flow rate
dis
p
la
y
Press and hold
f
o
r
3
seco
n
ds
Trip flow rate display
Press and hold for 1
second, or let stand
for 30 minutes
(*2) The trip flow rate value
is reset.
Press and hold fo
r
4 seconds
Press and hold for
10 seconds (*1)
Press and hold for
2 seconds (*1)
Constant display mode
For details, see the next page.
Press and hold for
10 seconds (*1)
Inventory mode (*1)
(*1)
A
pplicable only for the
Built-in batter
y
t
yp
e
(*)
A
pplicable only for the Built-in battery type

15
1) Constant display mode
During normal operation (while a flow rate value is displayed), pressing and holding the
“FLOW RATE” switch and the “START” switch together for four seconds or longer will
change the display to this mode.
You can select various setting items in sequence by pressing the “FLOW RATE” switch.
Pressing the “FLOW RATE” switch for two seconds or longer at the item you want to set
up (configurable constant only) allows you to set up the value.
Press the “FLOW RATE” switch to select the setting, and press and hold the “FLOW
RATE” switch again for two seconds or longer to confirm the setting.
When the “START” switch is pressed or no switch operations have been done for ten
seconds or longer during the selection of setting items, the display will return to an
integrated flow rate value.
When no input operations have been done for ten seconds or longer during setting, the
display will return to an integrated flow rate value even if the setting has not been
completed.
When the setting has not been completed, the constant data to be used is the previous
setting value.
The following figure shows the flow of constant setting and display.
Constant display mode: Press and hold the “FLOW RATE” switch + the “START” switch for four seconds
1. Serial number display
Press the “FLOW RATE” switch.
2. Integrated pulse constant display
Press the “FLOW RATE” switch.
3. High-density pulse output constant display
Press the “FLOW RATE” switch.
4. Pulse output unit setting
5. Pulse output width setting
Press the “FLOW RATE” switch.
Press and hold the “FLOW RATE”
switch for two seconds
(Start of setting)
Pulse output unit is being set
Press and hold the “FLOW
RATE” switch for two seconds
(Confirmation of setting)
Press the “FLOW RATE” switch.
Press and hold the “FLOW RATE”
switch for two seconds
(
Start of settin
g)
Press and hold the “FLOW
RATE” switch for two seconds
(Confirmation of setting)
Pulse output width is being set
When the
“START” switch is
pressed or no switch
operations have been
done for ten seconds or
longer during the
selection of setting
items, or when no
switch operations have
not been done for ten
seconds or longer
during the setting of an
item, the display will
switch to an integrated
flow rate value.

16
(2) Pulse output unit setting
Select the No.4 mode.
Pressing and holding the “FLOW RATE” switch for two seconds (i.e. start of setting) will
make the setting value for pulse output unit blinking (0.5 seconds interval).
You can change the setting value for pulse output unit in the range from 1 to 10,000 L/P by
pressing the “FLOW RATE” switch while the setting value is blinking (1 L/P, 10 L/P, 100 L/P,
1,000 L/P (1 m3/P), and 10,000 L/P (10 m3/P)).
After the setting has been completed, press and hold the “FLOW RATE” switch for two
seconds (i.e. completion of setting) to confirm the setting value, and then the display will
return to the item selection (current setting value display).
The following figure shows the overview of setting flow.
Press the “FLOW
RATE” switch
Pressing the switch will change
the setting value for pulse
output unit in the order of 1, 10,
100, 1,000, and 10,000.*1
Press and hold the “FLOW RATE”
switch for two seconds
(confirmation of setting)
4. Pulse output unit setting (current setting value display)
Press and hold the “FLOW
RATE” switch for two
seconds (start of setting)
Setting value for the pulse output unit
*1 Depending on the model, the restrictions specified in 4) Pulse output setting conditions are
applied to the pulse output unit and the pulse output width.

17
3) Pulse output width setting
4) Pulse output setting conditions
Select the No.5 mode.
Pressing and holding the “FLOW RATE” switch for two seconds (i.e. start of setting) will
make the setting value for output pulse width blinking (0.5 seconds interval).
You can change the setting value for pulse output width between 40 and 120 in order by
pressing the “FLOW RATE” switch while the setting value is blinking (40 ms and 120
ms).After the setting has been completed, press and hold the “FLOW RATE” switch for
two seconds (i.e. completion of setting) to confirm the setting value, and then the display
will return to the item selection (current setting value display).
The following figure shows the overview of setting flow.
Pressing the switch will change
the setting value for pulse outpu
t
width between 40 and 120.*1
Press the “FLOW
RATE” switch
Press and hold the “FLOW RATE”
switch for two seconds
(confirmation of setting)
5. Pulse output width setting (current setting value display)
Press and hold the “FLOW
RATE” switch for two
seconds (start of setting)
Setting value for pulse output width
*1 Depending on the model, the restrictions specified in 4) Pulse output setting conditions are
applied to the pulse output unit and the pulse output width.
Model Pulse
output
unit
Pulse
output
width
Configuration
allowed/not
allowed
Configuration
allowed/not
allowed
Configuration
allowed/not
allowed
Model Model
Pulse
output
unit
Pulse
output
unit
Pulse
output
width
Pulse
output
width
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed) ○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed) ○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
○(Allowed)
x
(Not
allowed)
x
(Not
allowed)
x
(Not
allowed)
x
(Not
allowed)
x
(Not
allowed)
x
(Not
allowed)

18
5) Inventory mode (applicable only for the Built-in battery type)
6) Behavior when a power failure occurs (applicable only for the external power
source type)
1) Power failure detection
When the power source voltage decreases to 8.9 ±0.5 V or less, the meter
recognizes the occurrence of a power failure and then turns off the LCD display and
suspends measurement.
The meter also saves the integrated flow rate and trip flow rate values immediately
before the detection.
2) Power failure recovery
When the power source voltage increases to 9.4 ±0.7 V or more, the meter
recognizes the recovery of a power failure and then turns on the LCD display and
resumes measurement.
The integrated flow rate value immediately before the detection of the power failure
is restored, and the integration is resumed from that value.
The product has the inventory mode for reducing the power consumption while it is in
stock.
In the inventory mode, the LCD display becomes "--------" and integration and pulse outpu
t
will not be carried out even when air flows.
The following figure shows how to operate the meter to change to and return from the
inventory mode.
Normal mode (any flow rate display)
Press and hold the “FLOW
RATE” switch and the “START”
switch for ten seconds
Normal mode (any flow rate display)
Press and hold the “FLOW
RATE” switch and the “START”
switch for four seconds
Constant display mode
Press and hold the “FLOW
RATE” switch and the “START”
switch for ten seconds
Normal mode (integrated flow rate display)
Press and hold the “FLOW
RATE” switch and the “START”
switch for two seconds
Inventory mode
The meter was factory-set to the normal mode (integrated flow rate display).

19
12 Instructions for the beginning of use
1. Open the inflow valve (upstream from the meter) gradually.
2. Open the outflow valve (downstream from the meter) gradually.
Check that the pilot is blinking.
3. Change the indicator display of the meter to an instantaneous flow rate value, and then
adjust the valve so that the flow rate value is in the specified range.
4. Use the meter in the normal mode with the integrated flow rate display.
5. At the time of power-on (applicable only for the external power source type), an integrated
flow rate value is displayed.
13 Instructions for inspection
Caution
Depending on the gas to be measured, installation environment, and use conditions, the
performance of the meter can rapidly deteriorate.
Periodically check the meter at the appropriate times in accordance with your usage
conditions.
1. When the pilot does not blink in spite of the presence of a gas flow, detach the meter from
the pipes and then gently blow air into the inlet of the meter to check whether or not the
pilot on the indicator blinks. If the pilot does not blink, check whether or not foreign objects
adhere to inside the meter. Remove such objects as necessary.
a. Foreign objects on the rim of the impeller can be removed by giving a light impact
on the body.
b. Due to the structural restrictions, it would not be possible to restore a meter that has
an adherent such as sealant that cannot be removed on-site. In such a case, you
will need to purchase a new one (i.e. the meter is not repairable).
2. If the foreign objects can be removed, blow air into the inlet again. When the pilot blinks,
the meter is now properly working.
3. When the most significant digit of the integrated flow rate display is blinking, it is warning
that the battery is running down (applicable only for the Built-in battery type). It is
recommended that the meter should be replaced immediately.