7178-501-3
Instantaneous/Accumulated Flowsensor NW, OF-W
Handling Manualcompliance

The pulse unit of output signal is indicated on the plate attached to the side of the body.
The standard specifications are as follows:, NW10-□TP : 1L/P
, NW20-□TP : 1L/P
NW05-□TP : 10 mL/P
OF05Z□WP : 10 mL/P
, OF10Z□WP : 10 mL/P

Features
Model
Display and number ofdigits
Display unit
Output signal(option)
Other functions

WeightPower supply

NW□□-□T□-□
LCD, eight digits

L, m3 and L/min, m3/min
Open drain output (equivalent to open collector)
Pulse width ･･･ 10 ms or more Maximum rated voltage･･･DC 30V
Output capacity ･･･ ON resistance: 150 Ω or less, OFF resistance: 100 kΩ or more
(Remaining voltage 1.5V or lower at input current 10 mA or less)
Trip accumulation function, constant setting function, accumulated value zero clear
function, instantaneous value hold function
NW05: Approx. 280 g
OF05W: Approx. 240 g
NW10: Approx. 250 g
OF10W: Approx. 260 g
NW20: Approx. 500 g
Built-in lithium battery Battery life Approx. 4 years (under normal use condition)* Battery cannot be replaced.

Use temperature range

0 to +60°C

Use humidity range

35 to 85%RH (no dewing)

Product code・NW□□-□T□-□
Magnet material
No symbol：Ba-Fe (Barium-Ferrite)
4：Sm-Co (Samarium-Cobalt )※However, for NW05 /NW10-T, The no symbol is but themagnet material is Sm-Co.
Pulse output
N：Without pulse output, P: With pulse output
Body material
P：PP(polypropylene), N: Modified PPO (polyphenylene oxide)
T：ETFE (ethylene-tetrafluoro ethylene)
Nominal diameter
05：5 mm, 10: 10 mm, 20: 20 mm
・OF□□Z□W□
Pulse output
Shaft
O-ringNominal diameter

Notes on handling

OF□□Z□W□

N：Without pulse output, P: With pulse output
A：Shaft - SUS304 (stainless)O-ring - NBR (nitrile rubber)
Z：Shaft - SiC (silicon carbide ceramics)
O-ring - FKM (fluoro rubber)
05：5 mm, 10: 10 mm- 1 -・ Keep the flowsensor 20 cm or more away from the power line.
・ When the flowsensor is affected by a noise (e.g., from a relay, motor, etc), attach a spark killer or similar device
to cancel the noise.
・ The flowsensor may malfunction near a device generating a higher frequency waves such as a cellular phone,ultrasonic washer, high-frequency generator, transceiver, etc.
・ Pay attention to the polarity of outputs when using them. Keep the output lines 20 cm or more away from thepower line.
Output line (white): +, output line (black): Notes on piping
・ Make sure to align the flow direction of the fluid with the arrow on the main body indicating the flow direction.
・ Provide a straight pipe at the upstream side (for NW only. OF‐W does not require a straight pipe).
If the pipe near the flowsensor at the upstream side bends two- or three-dimensionally or its diameter enlarged
or reduced radically, the measurement accuracy may be affected.
・ Make sure to make the pipe diameter at the inlet side larger than the nozzle diameter of the flowsensor(Please refer to the table on the next page).
・ If the flow in the pipe has pulsation, the measurement accuracy may be affected.
When transfering the fluid with a metering pump which can cause pulsation, cancel the pulsation using an
accumulator or similar devices.
・ Make sure not to apply excessive stress to the flowsensor when installing it.
・ Keep warm the entire system where the fluid can freeze in winter. If the fluid leaks due to freezing, themeasurement accuracy may be affected.
・ Avoid installing the flowsensor where it is exposed to a direct sunlight (indoor specifications).
・ Observe the appropriate conditions for the flow rate range, working pressure, and fluid temperature as
indicated on the plate attached to the side of the flowsensor. Avoid installing the flowsensor where it is exposed
to excessive pressure such as water hammer.
・ An air pocket in the flowsensor affects its accuraly. Use the flowsensor with its measurement chamber filledwith the fluid. Also, air passing through the chamber affects the accuraly. Be careful not to allow air to be mixed
in the fluid.
・ Do not place sensor near a strong magnet or magnetic field.

- 2 -・ The flowsensor can be installed in any position except for the position shown below. However, keep its position
as close as possible to the standard position shown below to have the highest accuracy.
Note that the models NW05TTN and NW10TTN must be installed in the standard position.
(OF-W can be installed horizontally or vertically in the upright or flat position. Make sure that the front plate■ Switch operation

becomes perpendicular to the ground (it must not be parallel to the ground)).
L／min Prohibited position( mark or electronic display faces down)

Standard installating position

Reverse Horizontal level

TOTAL

Horizontal level

TRIP･Switches from accumulated flow volume or trip accumulation display to instantaneous
flow rate display.
･Pressing and holding this button for approximately 3 seconds while the instantaneous flow rateis displayed switches to the display shown immediately before switching to instantaneous flowrate display. (When it is switched to trip accumulation display, the trip accumulation value is notcleared to zero.)･Pressing this button while the instantaneous flow rate is displayed, the instantaneous flow rate
shown at that moment is held.
･Pressing this button while holding the instantaneous flow rate cancels held display.
･Pressing this button while the accumulated flow volume is displayed causes CL display to blink.
･Pressing this button while the CL is blinking resets the accumulated value and switches toaccumulated flow volume display.
･Switches from accumulated flow amount or instantaneous flow rate display to trip
accumulation display and clears the trip accumulation value to zero.
･Pressing this button while the trip accumulation is displayed, the value clears it to zero. Pressing
and holding the button for 3 more seconds switches to accumulated flow volume display.
･Pressing this button while accumulated flow volume display or CL display is blinking switches to

L／min

+
Inner pipe diameter for straight pipe)

TOTAL
TRIP

Model

Inner diameter on inlet side

NW05

5.5 mm or more

NW10

10.5 mm or more

NW20

15.5 mm or more

OF05W

5.5 mm or more

OF10W

10.5 mm or moreaccumulated flow volume display without resetting the accumulated value.
･Pressing these buttons together for 2 or more seconds but less than 4 seconds causes
accumulated flow volume display to blink.
･Pressing these buttons together for 4 or more seconds switches to the normal setting mode
(Please see below for the operation method in this mode).

Straight pipe on each side of flowmeter

5D or more than (D : Nominal diameter)

No straight pipe is required

Tightening torque)
Model
NW05
NW10

Tightening torque
5±2N･mNW20

7±2N･mOF05W

5±2N･m

OF10W

7±2N･m

-3-

- 5 -

-4-

Press once

TOTAL

L/min

TRIP

ＣＬ

Long press
L/min(blinks)*When TOTAL/TRIP is pressed or there
has been no key operation for 10 seconds
the accumulated value is not cleared tozero and the display returns to theaccumulated flow volume display.

Multiple press

+
TOTAL

L/min

TRIP
Over.2 seconds

Accumulated flow volume display
１２３４５６７.８(blinks Approx. 10 seconds)

Clears the accumulated

L/min

Normal setting mode

*When TOTAL/TRIP is pressed formore 2 seconds after the accumulated
flow volume display started blinking.

flow amount to zero

+
TOTAL
TRIP
2 to 4 seconds

L/min* When switched from theaccumulated flow volume
value to momentary flowrate value.

+
TOTAL

Accumulated flow volume display
１２３４５６７.８（Always in 8-digit display）

2 to 4 seconds

+
TOTAL

TOTAL

TRIP
L/min

L/min

L/min

TRIP

TRIP

TOTAL
TRIP

Approx.3 seconds

2 to 4 seconds

Approx.3 seconds

L/min
Instantaneous flow rate display
１２.３（Up to 4 digits）

Trip accumulation display
１２３４５.６（Up to 6 digits）

Ｕ

L/min
L/min

Instantaneous flow rate value hold display
１２.３
Ｈ（Up to 4 digits）*Calculation of the accumulated value and trip
accumulation value continues during hold display.

Approx.3 seconds*When switched from trip accumulation display
instantaneous flow rate display, the trip value is notcleared to zero.

TOTAL
TRIP

Clears trip
value to zero

TOTAL
TRIP
Clears trip value to zero

- 5 -

■ Constant setting function･ Pressing these buttons together for 4 or more seconds switches to(Example) Setting the pulse constant value NW10 with 7.690 mL/P

the constant setting mode.

L／min･ When there has been no key operation for 10 seconds or the TOTAL/TRIP+

7.690 mL/P ⇒ 0.007690L/P ⇒ 7690

10-6

×

button is pressed while a constant setting value is displayed, the display

TOTAL
TRIP

returns to accumulated value display and any value which has not yet been
Mode No. 1

1．7 6 9 0

Mode No. 2

2．

EXP value(exponent)

Conversion
value

accepted is discarded.

Mode No. 1 (pulse constant conversion value*)Pressing the L/min and TOTAL/TRIP for 4 or more seconds together Mode No. 1 and the display changes asshown below (○ represents the current value).

6

Conversion value
Mode No. 1

１．○ ○ ○ ○Mode No. 3 (decimal position for accumulated flow volume display)

×1000 ×100 ×10 ×1

Pressing the L/min button while Mode No. 2 is on switch to Mode No. 3 and the display changes as shown
1. Pressing and holding the L/min button for 2 seconds makes the most significant digit to blink and ready forchange.
2. Pressing the L/min button each time changes the value.
(The available values are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.)
3. Pressing the TOTAL/TRIP button accepts the value and makes the second significant digit to blink and readyfor change.
4. When the least significant digit is set, display returns to the state in 1.
5. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.

below. (○ represents the current value.)
Display unit

Decimal position(number of decimal places)

3． ○Mode No. 3○

1. Pressing and holding the L/min button for 2 seconds makes the left digit to blink and ready for change.
2. Each time L/min is pressed, the valve is changed (The available values are 0 and 1, which choose "L" and"m3" as the unit, respectively).
3. Pressing the TOTAL/TRIP button accepts the value and the right digit blinks.

Mode No. 2 (EXP value for pulse constant conversion value *)Pressing the L/min button while Mode No. 1 is on switches to Mode No. 2 and the display changes as shown

4. Pressing the L/min button each time changes the value (The available values are -1, 0, 1, 2, 3, 4, 5, 6, and 7).

below (○ represents the current value).

5. Pressing the TOTAL/TRIP button accepts the value and returns to the state in 1.
6. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.
EXP value

Mode No. 2

2．

○

1. Pressing and holding the L/min button for 2 seconds makes the setting value to blink and ready for change.

The rightmost value represents the decimal position, and "0" means that the least significant digit of a displayed
value is in the digit of 100L (or 100 m3) while "-1" means that the least significant digit of a displayed value is in thedigit of 101L (or 101 m3).

Not shown on the LCD display
液晶表示器には表示されません
Accumulated
flow volume display
積算流量表示2. Pressing the L/min button each time changes the value. (The available values are 0, 1, 2, 3, 4, 5, 6, and 7.)
3. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.
* The values set in Modes No. 1 and No. 2 are used as the conversion value and EXP value, respectively. The
pulse constant can be set by entering these values. Note that the unit for the pulse constant set with Modes

7

6

5

4

3

2

No. 1 and No. 2 is "L/P."

1

0

-1

小数点なし
No decimal point

- 6 -

- 7 -

Mode No. 4 (decimal position for trip accumulation flow volume)

Mode No. 6 (instantaneous flow rate updating frequency)

Pressing the L/min button while Mode No. 3 is on switches to Mode No. 4 and the display changes as shown

Pressing the L/min button while Mode No. 5 is on switches to Mode No. 6 and the display changes as shown

below (○ represents the current value).

below (○ represents the current value).
Display unit

Decimal position(number of decimal places)

Mode No. 4

4． ○

○

○ ○

6．

Mode No. 6

1. Pressing and holding the L/min button for 2 seconds makes the setting value to blink and ready for change.
1. Pressing and holding the L/min button for 2 seconds makes the left digit to blink and ready for change.
2. Pressing the L/min button each time changes the value (The available values are 0 and 1, which choose "L"and "m3" as the unit, respectively).

2. Pressing the L/min button each time changes the value (The available values are 0.5, 1.0, 2.0, 3.0, 4.0, and
5.0 seconds and the default is 2.0 seconds).
3. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.

3. Pressing the TOTAL/TRIP button accepts the value and the right digit blinks.
4. Pressing the L/min button each time changes the value (The available values are -1, 0, 1, 2, 3, 4, and 5).

Mode No. 7 (pulse output digit)

5. Pressing the TOTAL/TRIP button accepts the value and returns to the state in 1.

Pressing the L/min button while Mode No. 6 is on switches to Mode No. 7 and the display changes as shown

6. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.

below (○ represents the current value).

The rightmost value represents the decimal position, and "0" means that the least significant digit of a displayed

Output digit

value is in the digit of 100L (or 100 m3) while "-1" means that the least significant digit of a displayed value is in thedigit of 101L (or 101 m3).
Mode No. 5 (decimal position for instantaneous flow rate display)Pressing the L/min button while Mode No. 4 is on switches to Mode No. 5 and the display changes as shown
below (○ represents the current value).
Display unit

Decimal position○

7．

Mode No. 7

1. Pressing and holding the L/min button for 2 seconds makes the setting value to blink and ready for change.
2. Pressing the L/min button each time changes the value (The available values are 0, 1, 2, 3, 4, 5, 6, 7, and 8).
"0" indicates a unit less pulse. For other values, a pulse is output each time the digit corresponding to thespecified value in accumulated flow amount display counts up(For example, when "3" is specified, a pulse is
output each time the third digit of accumulated flow amount display counts up).
3. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.

(number of decimal places)
Mode No. 5

5． ○

○

1. Pressing and holding the L/min button for 2 seconds makes the left digit to blink and ready for change.
2. Pressing the L/min button each time changes the value (The available values are 0 and 1, which choose"L/min" and "m3/min" as the unit, respectively).

Note: Be sure to choose a pulse output digit higher than the most significant digit of the pulse constant.
(Otherwise, the pulse output becomes undefined.)
Pressing the L / min button returns to the state in Mode No.1.
Factory settings

3. Pressing the TOTAL/TRIP button accepts the value and the right digit blinks.

Model

Mode 1Mode 2Mode 3Mode 4Mode 5Mode 6

Mode 7

4. Pressing the L/min button each time changes the value (The available values are -1, 0, 1, 2, and 3).

NW05

2500

6

02

02

02

2.0

1

5. Pressing the TOTAL/TRIP button accepts the value and returns to the state in 1.

NW10

7690

6

01

01

01

2.0

2

6. Pressing and holding the L/min button for 2 seconds accepts the value and turns on display.
The rightmost value represents the decimal position, and "0" means that the least significant digit of a displayed

NW20

2500

5

01

01

01

2.0

2

OF05W

4600

7

03

03

03

2.0

2

OF10W

2500

6

02

02

02

2.0

1

value is in the digit of 100L (or 100 m3) while "-1" means that the least significant digit of a displayed value is in thedigit of 101L (or 101 m3).

- 8 -

- 9 -

Rotation angle of display part

1．○○○○

L/min
2秒程度

L/min
Approx.
2 seconds
2秒程度
L/min

2． ○
L/min
2秒程度
Approx.
2 seconds

270° counterclockwise

Set the conversion
value
換算値の設定を行います。
Current
value is displayed.
・現在の設定値を点灯状態で表示します。
Approx. 2 seconds(blinks)
1．○○○○（点滅）Set the EXP value
ＥＸＰ値の設定を行います。
Current・現在の設定値を点灯状態で表示します。
value is displayed.
L/min
2秒程度
Approx. 2 seconds

2．

(blinks)○ ○ （点滅）

L/min

3． ○ ○
L/min
Approx.2秒程度
2 seconds

Set the decimal position and display unit of accumulated flow volume
積算流量表示の小数点位置の設定及び表示単位の設定を行います。
Current setting is displayed.
・現在の設定値を点灯状態で表示します。

L/min
2秒程度
Approx. 2 seconds

3．

Set the decimal position and display unit of the trip accumulation

L/min
Approx.2秒程度
2 seconds

トリップ積算流量表示の小数点位置の設定及び表示単位の設定を行います。
flow volume
Current setting is displayed.
・現在の設定値を点灯状態で表示します。
L/min
2秒程度
Approx. 2 seconds(blinks)
4． ○ ○（点滅）
L/min
L/min

5. ○ ○
L/min
Approx.2秒程度
2 seconds

at the stopper. Otherwise the display part will be broken and values cannot be displayed.

(blinks)○ ○（点滅）L/min

4． ○ ○

50° clockwise
The display part cannot be rotated unlimitedly in one direction. Never rotate it after rotation stops■ Battery voltage drop detection function
When the battery voltage drops below a specified value, the least significant digit of a displayed value blinks.
■ Storage mode
Pressing and holding the TOTAL/TRIP and L/min buttons together for 10 or more seconds switches to thestorage mode and the LCD shows "- - - - - - - -." In this mode, pressing and holding the TOTAL/TRIP and L/min

Set
the decimal position and display unit of the instantaneous
瞬時流量表示の小数点位置の設定及び表示単位の設定を行います。
flow rate ・現在の設定値を点灯状態で表示します。
Current setting is displayed.

buttons together for 2 or more seconds returns to the normal mode (accumulated flow volume display).
* The storage mode is not used in normal use.

L/min
2秒程度
Approx. 2 seconds(blinks)○ ○（点滅）

5．

L/min

6.

Set the refreshinterval of the instantaneous flow rate
瞬時流量表示更新間隔の設定を行います。
Current setting is displayed.
・現在の設定値を点灯状態で表示します。

○ ○

L/min
Approx.2秒程度
2 seconds

L/min
2秒程度
Approx. 2 seconds(blinks)○ ○（点滅）

6.
L/min

7.

Set the numberof digits for pulse output
パルス出力の桁の設定を行います。
・現在の設定値を点灯状態で表示します。
Current
setting is displayed.

○

L/min
Approx.2秒程度
2 seconds

L/min
2秒程度
Approx. 2 seconds

7.

(blinks)○ （点滅）- 10 -- 11 -

■External dimensions■Warranty● Warranty period
One year after the dispatch date from Aichi Tokei Denki facility.
Unit: mm
Model

90

8

● Warranty scope
We are making every effort to produce our products with high quality, however if a defect which is subject to ourliability should occur during the warranty period under normal use, we shall repair the product or replace it with anormal product for free.
Please understand that we shall determine whether the free remedy shall apply to your situation after ourinvestigation of the product.
Also please understand that the free remedy shall not be applied to a defect:1) Caused by use which does not follow the instructions given in our catalog, product specifications, and/or
handling manual,2) Caused by disaster such as a fire, earthquake, storm, flood, or lightening, or a destructive act such as acrime,
3) Caused by corrosion due to use in a corrosive environment,
4) Caused by acts of animals such as a dog, cat, rat, or insect,5) Caused by a factor other than our product,
6) Which could not be foreseen with the science and technology levels at the time of shipment,
7) Caused by a repair or alteration other than done by or specified by us, and/or
8) Caused by an inappropriate inspection and/or maintenance or replacement of a consumable.

Code length

Please note that "warranty" in this context means warranty for our product alone and we shall not reliable for any
damage resulting from a defect of our product, including but not limited to a damage to equipment other thanour product, loss of profit, loss of opportunity, transportation fee, and construction fee.

Unit: mm

1-2-70 Chitose, Atsuta-ku, Nagoya, Aichi Prefecture 456-8691 JAPANContact us : Overseas Business Division
TEL. +81-(0)52-661-5150
FAX. +81-(0)52-661-6418
Aichi Tokei Denki homepage: https://www.aichitokei.co.jp
The product specification might be changed without prior notice.

- 12 -- 13 -