NW/NW-PInstantaneous Flow-rate/
Integrating Flow Volume Flowmeter

NW/NW-P Photo

Feature

・Built-in lithium batteries (No external power supply is required)
・Indications of both instantaneous flow-rate and integrating flow volume by only 1 flowmeter
・Revolving display unit (It can be fixed to a easy-to-read position)
・Simplified structure with the vane wheel type measuring principle
・Measurement of various liquids
・Reset function for indications of Integrating Flow Volume (Total) and Integrating Flow Volume (Trip)
・Value holding function for Instantaneous Flow-Rate indication
・Pulse output function (Option)

Model NW (Local display type)
Model NW-P (With pulse output)

Enhanced basic functions, user friendliness and cost efficiency are the key points

ND series offers high accuracy measurement of not only cold and warm water but also pure water, chemical fluids, etc. It is light-weighted compact body and is compatible with various kinds of fluids with the carefully selected casing materials such as PP, ETFE, PPO, etc., and with the highly sensitive magnetic sensor of our own development. This series is therefore widely applicable for various flow measurements and its control and monitoring as well.

Flowsensor Applications

・To control of warm water temperature
・To constantly supply water and warm water
・To monitor coolant, etc.
・To proportionally inject chemical fluids
・To control pressure loss of filters

Specifications

Instantaneous flow-rate·
Integrating flow volume
flowmeter NW Type
NW05-NTN NW05-PTN NW05-TTN NW10-NTN
Instantaneous flow-rate·
Integrating flow volume
flowmeter (with pulse output)
NW-P Type
NW05-NTP NW05-PTP NW05-TTP NW10-NTP
Flow-rate range (m3/h) 0.3 – 3L/min 1.5 – 20L/min
Accuracy Flow-rate indication ±2%RS±0.05L/min ±2%
RS±0.2L/min
Volume indication ±2%RS (with the standard installation position)
Measurable fluids Various liquids (Please select with reference to
the following major materials of the liquid-touching materials)
Max. Working Pressure 1MPa (at the time of fluid temperature of 20°C)
Pressure Drop Not more than 12kPa
(At the time of 3L/min)
Not more than
20kPa
(At the time of
20L/min)
Fluid viscosity range 0.5-1.5mPa・s
Fluid temperature range 0±60°C
Ambient temperature range 0±60°C 35-85%RH(Dew condensation must be avoided)
Output signal (for NW-P) Open drain output (Equivalent to open collector)
Pulse width: Not less than 5ms
Max. rating voltage: 30 VDC
Output capacity: “ON resistance” Not more than 150Ω,
“OFFresistance” Not less than 100kΩ (Remained voltage
not morethan 1.5V in case of input current not more than 10mA)
Pulse unit (for NW-P) 10mL/p 1L/p
LCD Flow-rate Smallest Scale 0.05L/min 0.2L/min
Display digits 00.00L/min 000.0L/min
Volume Display digits 000000.00L 0000000.0L
Power supply Built-in lithium battery (Battery life 4 years. Not replaceable.)
Measurable fluids Refer to “MEASURABLE FLUID AND PARTS MATERIALS”
Structure IP64 equivalent, Indoor installation
Connection R1/2
Meter Weight Approx. 280g Approx. 250g
Major materials
of the liquid
touching parts
Casing Denatured
PPO
PP ETFE Denatured
PPO
Vane wheel POM ETFE POM
Pivot SUS304 PA ETFE SUS304
O-ring NBR FKM NBR
Magnet Sa-Co *1 Ba-Fe
Instantaneous flow-rate·
Integrating flow volume
flowmeter NW Type
NW10-PTN NW10-TTN NW20-NTN NW20-PTN
Instantaneous flow-rate·
Integrating flow volume
flowmeter (with pulse output)
NW-P Type
NW10-PTP NW10-TTP NW20-NTP NW20-PTP
Flow-rate range (m3/h) 1.5-20L/min 1.0-10L/min 3.0-60L/min
Accuracy Flow-rate indication ±2%RS±0.2L/min ±2% RS±0.5L/min
Volume indication ±2%RS (with the standard installation position)
Measurable fluids Various liquids (Please select with reference to
the following major materials of the liquid-touching materials)
Max. Working Pressure 1MPa (at the time of fluid temperature of 20°C)
Pressure Drop Not more than
20kPa
(At the time of
20L/min)
Not more than
15kPa
(At the time of
10L/min)
Not more than 60kPa
(At the time of 60L/min)
Fluid viscosity range 0.5-1.5mPa·s
Fluid temperature range 0±60°C
Ambient temperature range 0±60°C 35-85%RH(Dew condensation must be avoided)
Output signal (for NW-P) Open drain output (Equivalent to open collector)
Pulse width: Not less than 5ms
Max. rating voltage: 30 VDC
Output capacity: “ON resistance” Not more than 150Ω,
“OFF resistance” Not less than 100kΩ (Remained voltage
not more than 1.5V in case of input current not more than 10mA)
Pulse unit (for NW-P) 1L/p
LCD Flow-rate Smallest Scale 0.2L/min 0.5L/min
Display digits 000.0L/min
Volume Display digits 0000000.0L
Power supply Built-in lithium battery (Battery life 4 years. Not replaceable.)
Measurable fluids Refer to “MEASURABLE FLUID AND PARTS MATERIALS”
Structure IP64 equivalent, Indoor installation
Connection R1/2 R3/4
Meter Weight Approx. 250g Approx. 500g
Major materials
of the liquid
touching parts
Casing PP ETFE Denatured
PPO
PP
Vane wheel POM ETFE POM
Pivot SUS304 ETFE SUS304
O-ring FKM NBR FKM
Magnet Ba-Fe Sa-Co *1 Ba-Fe

Any installation position other than the standard installation position is not available for NW05-TTN, NW05-TTP, NW10-TTN, and NW10-TTP.
*1: The magnet does not touch liquid.

Dimensions

Mode NW05 NW10 NW20
A(mm) 80 80 110
B(mm) 87 87 105.5
C(mm) 52 52 74
D(mm) 11 11 16
E(mm) 25 25 35.5
nw_glaf

Standard installation position

The standard installation position is that the display is facing upwards.
* The display is able to be revolved.

nw_position

Materials -Abbreviations

Denatured PPO Denatured Polyphenylene oxide
PP Polypropylene
ETFE Ethylene-tetrafiuoro ethylene
POM Polyacetal or Polyoxymethylene
SUS304 Stainless steel 304
PA Polyamide
NBR Acrylonitrile-Butadiene Rubber
FKM Fluoro Rubber
Sa-Co Samarium-Cobalt
Ba-Fe Barium-ferrite

Handling Instructions

Observe the following handling instructions and precautions to obtain maximum performance of the Flowsensor / Flowmeter.

CAUTIONS IN MOUNTING

1. The flowing direction of the fluid, when mounting, must be matched to the arrow mark on the case that indicates the direction of flow.

2. A straight pipe with uniform inner diameter must be connected to the inlet. Accuracy is adversely affected if the pipe is bent or the inner diameter is uneven.

3. The inner diameter of the inlet pipe must be greater than the nozzle diameter of the Flowsensor / Flowmeter.

Type Inner D, of inlet pipe Length of straight pipe at inlet
ND05,NW05 5.5 mm or greater Greater than 50 mm from the end of the Flowsensor / Flowmeter
ND10,NW10 10.5 mm or greater Greater than 100 mm from the end of the Flowsensor / Flowmeter
ND20,NW20 15.5 mm or greater

4. If pulsation occurs in the flow of the fluid, measurement accuracy is adversely affected. When a pump is used to circulate the fluid, an accumulator must be provided to remove the pulsation.

5. Be careful not to apply excessive stress on the Flowsensor / Flowmeter during installation.

6. Make sure to provide thermal insulator at places subject to freezing in winter. When leakage occurs due to half frozen fluid, accuracy is adversely affected.

7. Do not expose/install the Flowsensor / Flowmeter under direct sunshine.

8. The measuring range, operating pressure and operating temperature are indicated on the plate on the side of the Flowsensor / Flowmeter. Observe these conditions for optimum performance of the Flowsensor / Flowmeter.

9. Avoid locating the Flowsensor / Flowmeter at places subject to excessive pressure and stress such as water hammer by operating components.

10. When air enters the Flowsensor / Flowmeter, measurement accuracy is influenced. Always operate the Flowsensor / Flowmeter chamber full of fluid. To maintain high accuracy, avoid mixture of air to the fluid.

11. Avoid placing a strong magnetic material or magnetic field near the Flowsensor / Flowmeter.

12. Installation position is flexible except those shown in figures on the upper right. However, it is recommended to install the Flowsensor / Flowmeter at the standard position whenever possible. For types ND 05-TATAAA, ND10-TATAAA, NW05-TTN, NW10-TTN, installation must be at standard positions.

Standard mounting position

sample2

CONNECTION (WIRING)

sample3

Measurable fluids and parts materials

MEASURABLE FLUIDS

1.Fluid which done not corrode materials that contact the fluid.
2.Viscosity of the fluid to be measured is between 0.5 and 1.5cp.
3.No slurry is contained.
4.Particles attracted by magnetic power such as iron, is contained in the fluid.
(All of the above 1-4 must be satisfied.)

LIST OF MATERIALS THAT CONTACT FLUIDS DIRECTLY

The table below shows components and materials of the standard type Flowsensor / Flowmeter used in portions that come into direct contact with the fluid.

Parts name Model
ND05-PATAAC
NW05-PTN
NW05-PTP
ND05-NATAAC
NW05-NTN
NW05-NTP
ND05-TATAAA
NW05-TTN
NW05-TTP
ND10-TATAAA
NW10-TTN
NW10-TTP
ND10-PATAAA
NW10-PTN
NW10-PTP
ND20-PATAAA
NW20-PTN
NW20-PTP
ND10-NATAAA
NW10-NTN
NW10-NTP
ND20-NATAAA
NW20-NTN
NW20-NTP
Lower casing
Upper casing
Regulator
PP Denatured PPO ETFE PP PP Denatured PPO
Vane-wheel POM POM POM POM POM
Pivot PA SUS304 PA SUS304 SUS304
O-ring FKM NBR FKM FKM FKM NBR
Magnet Samarium cobalt (No contact with fluid) Samarium cobalt (No contact with fluid) Samarium cobalt (No contact with fluid) Ba-Fe Ba-Fe Ba-Fe
Measurable fluid Water,
Chemical fluid
(Weak corrosion resistance)
Water,
Warm Water
Chemical fluid Water, Chemical Fluid
(Weak corrosion resistance)
Water,
Warm Water

Material Code

・Ba-Fe: Barium-Ferrite
・ETFE: Ethylene-tetrafluoro ethylene
・FKM: Fluoro Rubber
・NBR: Acrylonitrile-butadiene rubber
・PA: Polyamide
・POM: Polyacetal or Polyoxymethylene
・PP: Polypropylene
・PPO: Polyphenylene oxide
・SUS304: Stainless steel

・Specifications are subject to change without notice.
Product Warranties