7178-589

Small-Size
Electromagnetic Sensor VN
Handling Manual

PipingCautionDangerWarning

CautionThis indicates that if you ignore this instruction, danger which
may result in death or serious injury can occur.
This indicates that if you ignore this instruction, danger which
may result in injury can occur.
Warning
This indicates that if you ignore this instruction, a physicaldamage (e.g., defect of the product) can occur.

1. Do not use the product where air can ingress.
Also, do not install it where a air pocket can easily occur(e.g., the upstream side of a falling pipe). Before starting to
use the product after installation, drain air sufficiently.
2. It is recommended to install the sensor as the LED seal
surface becomes parallel to the ground or fluid flows
from the bottom to the top in order to avoid influence bybubble, dust and/or dirt, etc.
3. Install something that disturbs the flow such as flow
adjustment valve at the downstream of the product.
4. Do not install the product on a piping system where animpact pressure such as a water hammer can occur.
5. Wash a new pipe thoroughly before installing it and using
the product with it.
6. Do not install the product where a strong compression
tension force or a strong load is applied to it.
7. Put and install the sensor in accordance with the flow
direction indicated on the product.
8. Make sure that the sealing tape used for installation of thesensor unit does not get into the inside of the pipe.
9. Make sure that no burr exists with the end of the pipes
connected to the product.
10. Do not drop, hit, or apply an excessive impact to theproduct. Hold the body when you handle the product (neverhold the cable).
1. Observe the specified tightening torque shown below.
Donot apply an excessive torque. An excessive torque may
break the sensor sleeve screw section and cause leakage.
VN05R: 3.0±0.5 Nm
VN10R: 5.0±0.5 Nm
VN20R: 1 2 ± 1 Nm
If the fluid still leaks after tightening the screws with theabove torque, do not tighten them with a higher torque but
check the screws and sealing tape for defects.
2. Do not install in locations used as footholds .

Notes on useDanger

1. Do not use this product for a purpose which requires safety,
such as atomic power generation, railways, aviation, vehicle,
or playground equipment.
2. Do not alter the product.
3. Do not use this product for food, beverage, and/or medical
fluid because it does not conform to the sanitary
specifications.
4. Do not use in an explosive atmosphere such as acombustible gas because it is not explosion-protected.
5. Do not expose the product to a corrosive fluid.

Use environment and target fluid

Caution

1. The target fluid is even water with conductivity of 50 μS/cm
or higher. Make sure to observe the applicable range ofconductivity. In particular, this product cannot used with fluidwhich conductivity is extremely low, such as pure water or oil.
2. Never install the sensor unit where the fluid can freeze or its
temperature can exceed 60°C.
3. The product may malfunction if it is used within fluid where astray current is flowing.
4. Observe the permissible pressure range (1 MPa or less).
5. Since the product is not water-proof (IP64 equivalent), do
not install it where it can be submerged.
6. Do not get a strong magnet or magnetic field close to theflowsensor.

Notes on operation

Caution

1. This product cannot be used for billing application.
2. Do not use any display or output during 20 seconds afterpower on until operation becomes stable.

Cabling

DangerCaution

1. This products operates with 12 to 24VDC. Connecting it to a
AC power supply may cause a fire.
2. Observe the instructions given in this manual for cabling.
3. Observe the rated range. Do not use a load exceeding thepermissible value.
1. Keep the cables away from the power and motor cables.
2. Keep the product away from noise sources as far aspossible.
3. It is recommended to electrically isolate power supply andreceiving instruments from other equipment.
4. Do not apply an excessive tension to the cables.
5. Be careful so that the cable tip is not soaked in water during
the cabling work.

Checking specifications- Confirm that the specifications indicated on the seals attached to the
top of the package as well as to the back of the sensor are identical tothose ordered.
- Be sure to confirm the specifications for both of the two output channels(channels 1 and 2).

Wiring- Alert items and display pattern- Refer to the figure below for electrical connection.

Alert itemPower
電 源supplyPower
supply voltage (12~24VDC)
供給電圧(ＤＣ１２～２４V)

Flowsensor

GND
ＧＮＤ

流量センサーRed (power
supply +)赤(電源＋)

Receiver
受信器

Priority

Display pattern

Voltage drop1

Turns on continuously for both redand green.

Excitation failure ormemory error

2Turns on continuously.

Dry sensor

3

Excessive fluid noise

4

Reverse flow

5

Excessive flow

6ＶWhite(output 1)
白(出力１)

Ｒ

オープンOpencollector
input
コレクタ入力Yellow(output
黄(出力２)2)
ISBlue (Powersupply -)青(電源－)GND
ＧＮＤsink current) ＝出力吸込電流)
I S ((OutputV (Pull-up voltage)Ｖ(プルアップ電圧)
RＲ(プルアップ抵抗)(Pull-up resistance)≦20mA

Keep the pull-up voltage at 30V or less and output sink current for eachchannel at 20 mA or less.

Turns on and off for 0.3 seconds
respectively for one cycle, and thenturns off for 1.7 seconds.
Turns on and off for 0.3 seconds
respectively for three cycles, andthen turns off for 1.7 seconds.
Turns on and off for 0.3 seconds
respectively for two cycles, and thenturns off for 1.7 seconds.
Turns on and off for 0.3 seconds
respectively for four cycles, and thenturns off for 1.7 seconds.

Dry
乾 水sensor
検知On
点灯

2S
0.3S
0.3s
2s
過 大 流 体 ノfluid
イズ検知Excessivenoise

消Off灯

On
点灯

LED indication- A bicolor (green/red) LED indicates the flow rate or alert. An alert
caused by detection of abnormality is prioritized, and only an alert withthe highest priority is indicated.
Green: Indicates the flow rate with four blinking and lighting patterns
in three levels.
Red: Indicates an alert (fault detection) with six blinking and lighting
on/off patterns in four levels.

0.3S
0.3s
逆 流 検 知 flow
ReverseFlow rate range

Blinks at 2-second interval by turning on
and off for 1 second respectively.
Blinks at 1-second interval by turning on
and off for 0.5 seconds respectively.
Blinks at 0.4-second interval by turning on
and off for 0.2 seconds respectively.

(Low-flow-cut flow rate to 1/3 of the upper limit of the accuracy-guaranteed（ゼロカット流量～精度保証流量範囲上限値の1/3）
flow rate)

On
点灯

1S1s

Off消灯

(1/3 to 2/3（精度保証流量範囲上限値の1/3～2/3）of the upper limit of the accuracy-guaranteed flow rate)
点灯
OnOff消灯
0.5s 0.5S
0.5s
0.5S(Higher than 2/3 of the upper limit of the accuracy-guaranteed flow rate)（精度保証流量範囲上限値の2/3以上）
On
点灯
0.2S
0.2s

0.2s
0.2S

Off消灯

2. Alert (red)- Alert items
Excitation failure
Memory error
Voltage drop
Dry sensor
Excessive fluid noise

Reverse flow
Excessive flow

点灯
On2S2sOff灯
消●Warranty period
One year after the dispatch date from Aichi tokei denki facility.

Turns on continuously.

low-flow-cut flow rate to 1/3 of theupper limit of theaccuracy-guaranteed flow rate
1/3 to 2/3 of the upper limit of theaccuracy-guaranteed flow rate
Higher than 2/3 of the upper limit of
the accuracy-guaranteed flow rate

1S
1s

Off灯
消Warranty
Display pattern

Less than low-flow-cut flow rate

On点灯

2S
0.3S
0.3s
2s
過 大 流 量 検flow
知Excessive

0.3S
0.3s

1. Flow rate (green)- Flow rate range and display pattern

消Off灯

2S2sCurrent does not flow through the excitation coilcorrectly.
Error has been detected with memory data.
Power supply voltage has dropped.
Target fluid has gone out of the flowsensor and thesensor is not filled with it.
Normal measurement is not possible since an abnormal
current is flowing through the target fluid or air is mixed
in it.
Target fluid is flowing in the reverse direction.
125% or more of the maximum flow rate for the model
has been detected.

●Warranty scope
We are making every effort to produce our products with high quality,
however if a defect which is subject to our liability should occur during
the warranty period under normal use, we shall repair the product orreplace it with a normal product for free.
Please understand that we shall determine whether the free remedy
shall apply to your situation after our investigation of the product.
Also please understand that the free remedy shall not be applied to adefect:1) Caused by use which does not follow the instructions given in ourcatalog, product specifications, and/or handling manual,2) Caused by disaster such as a fire, earthquake, storm, flood, orlightening, or a destructive act such as a crime,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/or8) Caused by an inappropriate inspection and/or maintenance orreplacement of a consumable.
Please note that "warranty" in this context means warranty for ourproduct alone and we shall not reliable for any damage resulting from a
defect of our product, including but not limited to a damage toequipment other than our product, loss of profit, loss of opportunity,transportation fee, and construction fee.

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.

Ver.0202211