Product Specifications

FZ01-340E1

For Sodium Hypochlorite /Sodium Hydroxide Solutions

Reliability
Creativity Service

Model

Compact Electromagnetic Flow Sensor

1/7

VNSRF
VNSRE

Measure-mentmode

Model

VNS05R

VNS10RVNS20R

Pulsation flow
measurement mode

1. Specifications

Nominal diameter
Accuracy guaranteed
flow-rate range
Applicable pump
AccuracyFrequency(at fluid
temperature
pulse

5mm

10mm

20mm

0.01 to 1 L/min

0.1 to 10 L/min

0.6 to 60 L/min

Electromagnetic (solenoid) diaphragm constant volume pump only
±5.0%RD: 20 to 100% of the maximum accuracy guaranteed flow rate
±1.0%F.S.: 5 to 20% of the maximum accuracy guaranteed flow rate

Constant flow
measurement mode

25C)

Accuracy guaranteed
flow-rate range
Low flow cutoff (standard)Frequency
Accuracypulse(at fluid
temperature
25C)

Unit pulse

Repeat accuracy
Temperature characteristics
Conductivity characteristics

Specifications common to the both modes

Fluid to be measured

0.05 to 1 L/min

0.5 to 10 L/min

0.025 L/min
0.25 L/min
1.5 L/min±2.5%RD: 20 to 100% of the maximum accuracy guaranteed flow-rate±0.5%F.S.: 5 to 20% of the maximum accuracy guaranteed flow-rate±2.0%RD: 20 to 100% of the maximum accuracy guaranteed flow-rate±0.4%F.S.: 5 to 20% of the maximum accuracy guaranteed flow-rate±2.0%F.S.: 3σ under the following conditions(Output deviation per sec, response 2 sec, frequency pulse)±2.0%RD: 20 to 100% of the maximum accuracy guaranteed flow-rate±0.4%F.S.: 5 to 20% of the maximum accuracy guaranteed flow-rate±1.5%RD: 20 to 100% of the maximum accuracy guaranteed flow-rate±0.3%F.S.: 5 to 20% of the maximum accuracy guaranteed flow-rate
VNS□□RF: Sodium hypochlorite solution"concentration 1 to 12%"
VNS□□RE: Sodium hydroxide solution"concentration 10 to 25%”

Fluid conductivity range

14mS/cm or higher

Fluid temperature range

0 to +40C (No freezing)

Working ambient
temperature/humidity range

Storage ambient
temperature range
Maximum working pressure
Pressure drop(the maximum accuracy
guaranteed flow-rate)

Outputspecificati
ons

3.0 to 60 L/min-20 to +60C

35 to 85%RH (No dew condensation)-20 to +70C
1MPa
20kPa or lessPulse output(Output 1 and2must bespecified.)

NPN open collector pulse
Maximum load : Output 1: 28VDC 20mA
Output 2: 30VDC 20mA
ON-time residue voltage: 1V

ASSP serial
communication(Since this is thecalculation/com
munication
method used
when ASI-200 isconnected, it is
not necessary to
specify Output 1
and 2.)

ON-time resistance: 200Ω or less, OFF-time resistance: 100kΩ or more
Cable length: 10m or less (AWG28)

Product Specifications

FZ01-340E1

For Sodium Hypochlorite /Sodium Hydroxide Solutions

Reliability
Creativity Service

VNSRFModel

VNSRE

Compact Electromagnetic Flow Sensor

Model

VNS05R

High-density
pulse *1

Duty
ratio
: 50%

Unit pulse

Standard 200.0Hz(Adjustable at factory from 20 to 400Hz in 0.1Hz steps)
Note: When ASI-100 or ASI-200 is connected,
200.0Hz is recommended for Output 1.
0.001L/P (standard)
0.01L/P (standard)
0.1L/P (standard)

Switch *4

Select from Normal Open (standard) and Normal Close.
Level judgment value: Adjustable at factory from 0 to 100% of the
maximum accuracy guaranteed flow rate in 1% steps

Alarm *3

*2

VNS20R

Alarm *3

Unit pulse
Output 2

VNS10R

Select from Normal Open (standard) and Normal Close.
Alarm can be set at factory for each of “Excitation Error/Memory Error/
Low power supply voltage /No water/Excessive Fluid Noise/
Reverse Flow/Excessive Flow.”

Output 1*2

2/7

Switch *4
Response-ability
Basic specifications
Terminal
processing

Wiring

Cable

Same as Output 1
Same as Output 1
Note: When ASI-100 or ASI-200 is connected,
Alarm is recommended for Output 2.
Same as Output 1
63% response Dumping time: 2 seconds (standard)
Adjustable at factory from 0.1 to 600 seconds in 0.1second steps.
Cable length: 500mm, 4-core AWG26, outer diameter Φ4.2, shielded
Coating is peeled off and core wires are twisted.

ASI-200

Red: Power supply+White: Sending line

Blue: GND
Yellow: Receiving line

ASI-100 or
Generalreceiver

Red: Power supply+White: Output 1

Blue: GND
Yellow: Output 2

LED display

Standard installation position
Flow direction
Pipe connection
Protection grade

Single LED On the flowsensor, bicolor LED(green/red)
Green: Indicates the flow rate by three blinking speeds
Red: Indicates the error status by the number of blinks
The position that the LED surface is parallel or perpendicular(from bottom to top) to the ground.
(No air shall be in the fluid)
Arrow direction indicated on the product
Socket-shape
Socket-shape union joint 16Aunion joint 20A
Indoor specification (equivalent to IP64)
24V DC±10%Power supply

It is recommended to supply power from an isolated power supply and connect a
separate power supply to each VNS.
In the pulsation flow measurement mode, the power supply FG terminal isrecommended to be grounded (Class D or higher).

Current consumption
Weight

60mA DC or lessApproximately 200g

Approximately 200g

Approximately 300g

Product Specifications

FZ01-340E1

For Sodium Hypochlorite /Reliability
Creativity Service(Circled
parts arewetted.) *5

VNS05RTop andbottomCoversMain bodycasingSocket-shape union joint
Detailed modelVNSRE

Compact Electromagnetic Flow Sensor

Model

Main
materials

VNSRFModel

Sodium Hydroxide Solutions

Electrode
Groundingring
O-ringOthers

3/7

VNS10RVNS20R

PPS
PEEK
PVC
VNS05RF

VNS05RE

VNS10RFVNS10RE

VNS20RFVNS20RE

Titanium(2 types)

Hastelloy C22(or equivalent)

Titanium(2 types)

Hastelloy C22(or equivalent)

Titanium(2 types)

Hastelloy C22(or equivalent)

Titanium(2 types)

Hastelloy C22(or equivalent)

Titanium(2 types)

Hastelloy C22(or equivalent)

Titanium(2 types)

Hastelloy C22(or equivalent)

FKM

EPDM

FKM

EPDM

FKM

EPDM

CE Marking product ，UKCA Marking product ，RoHS directive compliant

2. Selection Sheet* Check of each item to select or enter a value as necessary.
 VNS05RF VNS10RF
 VNS20RFModel
 VNS05RE
 VNS10RE VNS20RE
Pulsation flow measurement mode: The applicable pump is electromagnetic(solenoid) diaphragm constant volume
pump only. Use it with the stroke length100%* the pulsation flow measurement mode setting is “Output 1: Frequency pulse
Measurement modeand Output 2: Alarm.
Constant flow measurement mode: Other than electromagnetic (solenoid)
diaphragm constant volume pump
* The flow rate of the in-fluid valve less pump is too low to measure by VNS.
In addition, some pulsation pumps are not applicable for measurement by VNS.
Check the manufacturer and model of the pump and consult us.
Forward flow
Flow directionForward/reverse flow (Reverse flow: Accuracy not guaranteed): Contact us fordetails.
Low flow cutoff
 Yes (standard): 2.5%F.S.
No(In case flow-rate is lower than theFor“Yes”:VNS05R:
0.025
L/min,VNS10R:
0.25
L/min,VNS20R: 1.5 L/min
specified flow-rate, it is calculated as 0.)
Choose from 0.1 to 600 seconds
Dumping(standard: 2 seconds)(Enter the number ofsecseconds.)★ Enter a value in 0.1second steps.
Pulse output
ASSP serial communication (Calculation/communication method used when
Output specifications
ASI-200 is connected)* When ASSP serial communication is selected, it is not necessary to specify
Output 1 and 2.

Product Specifications

FZ01-340E1

4/7

For Sodium Hypochlorite /Model

Sodium Hydroxide Solutions

Reliability
Creativity Service

Compact Electromagnetic Flow Sensor
OutputformatNormal Open (N.O.: Standard)

Normal Close (N.C.)

 Frequency pulse*1* In case of use with
ASI-100orASI-200, 200.0Hz
of frequency pulse isrecommended.

Unit pulse

Alarm*3

VNSRF
VNSREHz

20.0 to 400.0Hz(Standard: 200.0Hz)
The frequency is selectableby 0.1Hz steps.

･VNS05R: 0.001L/P(Standard) 0.01L/P 0.1L/P･VNS10R: 0.01L/P(Standard)
0.1L/P 1L/P･VNS20R: 0.1L/P(Standard)
1L/P
10L/PFor each alert judgment item, the state is normal if
nothing is detected and abnormal if any item is detected.
Choose items to trigger alerts in 2-1. Alarm Judgment
Items below.
* In case Alarm is selected for Output 1, choose otherthan Alarm for Output 2.
Level 1 judgment value
Level 1 judgment value Hysteresis
Level 2 judgment value
Level 2 judgment value Hysteresis*2

Output 1

Output type
Choose one ofthe options.
* Standard isfrequency
pulse.

 Switch leveljudgment *4

Contact output 1
Contact output 2

Abnormal state
Normal stateThis is to judge as normal condition when flow-rate is not
more than the set Level1 Judgment Value and asabnormal condition when flow-rate is above the set Level
1 Judgment Value. →Enter the level judgment values in
2-2.Level Judgment Values.
Level 1 judgment value
Level 1 judgment value Hysteresis
Level 2 judgment value
Level 2 judgment value Hysteresis

Switch window
judgment*4

Contact output 1 orcontact output 2

Abnormal state
Normal state
Normal stateThis is to detect whether flow-rate is within the set upper
limit and the set lower limit or falls outside of the range,
and to judge as normal condition when flow-rate is not
more than the set upper limit and not less than the set
and as abnormal condition when flow-rate or falls outsideof the range. Setting of the upper limit value and thelower limit value can be with either of Level 1 Judgment
Value and Level 2Judgment Value. →Enter the leveljudgment values in 2-2.Level Judgment Values.

Product Specifications

FZ01-340E1

For Sodium Hypochlorite /Sodium Hydroxide Solutions

Reliability
Creativity Service

Model

Compact Electromagnetic Flow Sensor

Output format

Normal Open (N.O.: Standard)

VNSRF
VNSRENormal Close (N.C.)

Alarm*3*2

Output type
Choose oneof the options.
* Standard is
Alert.

Output 2*In case of use with ASI-100 or
ASI-200, Alarm is
recommended.

Same as Output 1

Unit pulse
Switch Level
Judgment Values*4
Switch window
judgment*4

Same as Output 1
Same as Output 1
Same as Output 1

2-1. Alert Judgment Items *6
Excitation Error
detection“Output” only for both LED operation and switch output

Memory Error detection“Output” only for both LED operation and switch output

Low power voltage“Output” only for both LED operation and switch output

detection
No-water detection
Excessive fluid noise
detectionReverse Flow detection
Excessive Flow Rate
detection

LED operation
Switch output
LED operation
Switch output
LED operation
Switch output
LED operation
Switch output

Active (Standard) Inactive
Active (Standard) Inactive
Active (Standard) Inactive
Active (Standard) Inactive
Active (Standard) Inactive
Active (Standard) Inactive
Active (Standard) Inactive
Active (Standard) Inactive

2-2. Level Judgment Value *7
Level 1 judgment
value

%

0 to 100% (Standard: 50%)
 This is selectable by 1% steps.

Level 2 judgment
value

%

0 to 100% (Standard: 30%)
 This is selectable by 1%steps.

Hysteresis%

0 to 9% (Standard: 3%)
 This is selectable by 1% steps.

5/7

Product Specifications

FZ01-340E1

For Sodium Hypochlorite /Reliability
Creativity Service

VNSRF
VNSRE

Model

Sodium Hydroxide Solutions

6/7

Compact Electromagnetic Flow Sensor*1: Indicates the frequency at the maximum accuracy guaranteed flow-rate.
*2: Output 1 and 2 values and selected items are fixed at factory and cannot be changed after installation.
*3: Alarm can be selected for either Output 1 or Output 2 only.
*4: Window judgment is calculated and output by using the set values for Output 1 and 2.
*5: Material symbols
PPS
Polyphenylene Sulfide
PEEK*Poly Ether Ether ketone
PVC
Polyvinyl chloride
Ti
Titanium
FKM
Fluoro Rubber
EPDM*Ethylene Propylene Rubber*6: Description of Alert items
Excitation Error detection ·················
Memory Error detection ····················
Power Supply Low Battery detection ···Dry detection ·································
Excessive Fluid Noise detection ·········

When current does not flow through the excitation coil correctly
When a memory data error has occurred
When the power supply voltage has gone lower
When the flow sensor is not full of fluid to be measured
When correct flow measurement is not possible because
abnormal current is flowing through the fluid to be measured, air isin the fluid, etc.
Reverse Flow detection ····················
When the fluid is flowing in the direction opposite to the arrow on
the flow sensor
Excessive Flow detection ·················
When the flow rate exceeds 125% of the upper limit of theaccuracy guaranteed flow rate
*7: The maximum flow-rate of the accuracy guaranteed flow-rate range is 100%.

3.Wiring technique
Flowsensor
Red：Power supply＋

Sensor power supply＋(24V DC)

White：Out put1←
Ｉｓ

Ｒ
Open collector input＋

Yellow：Out put2←
Ｉｓ

(Power supply voltage：30V DC or less)Ｒ

Blue：GND

Sensor power supply＋
and Open collector input－

Please set the sink current for open collector output of output 1and output 2 to 20mA or less.
(Recommended resistor is 10kΩ～20ｋΩ.)V(Power supply voltage：Volt)
Is(Output sink current：mA)＝
R(Pull-up resistor：kΩ)≦20mA

Product Specifications

FZ01-340E1

For Sodium Hypochlorite /Sodium Hydroxide Solutions

Reliability
Creativity Service

Compact Electromagnetic Flow Sensor

Model

7/7

VNSRF
VNSRE

4. Precautions for handling
Before handling the product, be sure to read the handling manual carefully. And, use the product correctly.
4-1. Working environment, fluid to be measured(1)Ensure that the wetted parts' materials have corrosion resistance against fluid to be measured.
(2)The product cannot be used for non-conducting fluid such as purified water, oil, etc.
(3)Flowing of electric current in the fluid to be measured may leads to incorrect operation.
(4) Keep the product away from a strong magnetic field or a source of electric noise.
(5)The product is not explosion-proof specification. Do not use the product in an explosive atmosphere suchas flammable gas, etc.
(6)Avoid installation at a place exposed to direct sunlight and/or rain (Indoor specification).
4-2. Precautions for piping(1)In case of parallel installation of plural pieces of the product, to decrease wavering of flow detection byelectromagnetic interference, distance each of them 20cm or more.
(2)No air shall be in the fluid to be measured. The measurement accuracy is to be affected.
(1) Do not install the product at a place where air accumulation can easily occur (e.g. upstream side of afalling pipe. Also, before start measurement, remove air sufficiently.
(3)For the installation position of the flowsensor, to avoid influence of air bubbles, dust, dirt, etc., theorientation that makes the flow direction be from bottom to top is recommended.
(4)Devices such as a flow-rate adjusting valve, etc., which disturb flow shall be installed in the downstream of
the flowsensor.
(5)Avoid installing the product where it is exposed to excessive pressure, such as water hummer, etc.
(6)In case foreign substances, oil, etc., exist in the piping, install the flowsensor after cleaning inside of thepipe.
(7)Make sure to align the flow direction of the fluid with the flow direction indicated by the arrow on the mainbody.
(8)Provide straight pipe portion of 5D or more at the upstream and 3D or more at the downstream of theflowsensor.
(9)Around the place of installation, provide enough space for maintenance.
4-3.Wiring(1)For a power supply and a remote counter, it is recommended to electrically isolate them from others.