Nitrogen Oxides Analyzer
model NA-721
Nitrogen oxides are the causative agents such as thephotochemical smog and acid rain. NA-721 is acontinuous analyzer that measures NOX, NO and NO2
in ambient air by a chemiluminescence method (CLD)
complying with JIS B 7953.

High accuracy measurement and zero stability
is achieved by the flow switching method.

Large capacity memory to save measured
data for over a year.

Low span drift by the simultaneous calibrating
technology.

USB memory for general-purpose is available
to data extraction

Simple operation on a large color LCD touch
panel offers a lot of information.

Ethernet interface is available as standard
equipment for digital telemetering

General Specifications
Measuring object

Nitrogen oxides（NO2, NO, NOX）in ambient air

Measuring method

Chemiluminescence method (JIS B 7953)

Measuring range *0 - 1 ppm (normal), 0 - 2 ppm (optional)

Analog output range *0 - 0.1/ 0.2/ 0.5/ 1.0 ppm
4-ranges auto/manual switching (normal),0 - 0.2/ 0.5/ 1.0/ 2.0 ppm
4-ranges auto/manual switching (optional)*Starting range is selectable*Fixed range is also available

Interference

4 ppb or less (NH3 1ppm),
4％ or less (moisture 25oC 80％RH)

Warming-up timewithin 3 hour

Ambient temp.

0 - 40oC

Sample flow rate

approx. 1 L/min

Dust filter *φ47mm PTFE filter

LCD display

Measuring data, Output range, performanceand control information, Messages, Alert

Internal data memory

Measuring data (1min, 1h data), Operation
history, Messages, Alert

Repeatability±1% of span gas concentration

Zero drift±1ppb /week

Span drift±2% /day, ±4% /week of span gas conc.

Digital IN/OUT

Ethernet, USB1.1, RS232C

Linearity±4% for half number of span gas conc.

Stability to voltage
fluctuation±1%/ 100±10V for span gas conc.

Output for serial
recorder (optional) *Measuring data (1min, 1h data), Operation
history, Messages, Alert

Stability of reading fortemperature change

Zero: within ± 1 ppb / 5oC

Analog output for
telemeter (optional) *DC 0 - 1V : Continuous data, 1h mean value
Contact signal : Output range, external reset,
adjusting, power discontinuity, disconnecting,system failure, etc.

Conversion efficiency

96% or morePower requirementAC100V 50/ 60Hz approx. 300VA

Response time

3 minutes or less（T90）

Withstand voltage test

AC1000V 50/ 60Hz during 1 min.

Detection limit

1 ppb or lessInsulation resistancemore than 5 Megohm

Rack mount

A17: H875mm rollaway rack
A22: H1100mm rollaway rack

Analog I/O unit for atelemeter

TU07 : terminal block(Rear connection with rack mount)

RecorderSerial recorder
Chart width:180mm

Auxiliary gases supply

Automatic diluter DS-071N single diluting byflow ratio with zero gas generating unit.

Span: within ± 2 % / 5oC of span gas conc.

Optional*For further information, please contact us.

Flow Diagram
Valve forpressure control
Bypass inlet forpressure control
Bypass filter

Suction pumpDryer2
Moisturechecker

D2

Ozone
generator

Flow sensor
for ozone

Orifice4
Zero gas
generator

Filter forzero gas

Valve for zero gas
CNC
NO

V1

Orifice1
Valve for
Sample/Span

Inlet forSAMPLENO

Valve for NOCNC

V4Dust filter

Dryer1

Orifice for
ozone

C

D1

Inlet forSPAN GAS

NCNO

Orifice2

V2

Orifice forsample flow

P

Valve for NOx
Converter

CPressuresensor

NCNO

Orifice3

Reaction Detector
chamberV3Flowsensor

Ozone
remover

Dimensions
485

505590230485

Desktop type (approx.16 kg without pump)875

Unit: mm

Product CodeNA-721Rack-mount type (A17) (approx.52kg, incl. pump and DS-071N)

T1
A1
A2

Desktop type
A17 Rack
A22 Rack

R0Serial Recorder
No useT
0Analog I/O unit for a Telemeter TU07
No useD0Standard gas generator DS-071N
No use1
2Measuring range 0 - 1 ppm
Measuring range 0 - 2 ppm

CAUTION*) Operation manual should be read before measuring.
*) To avoid fire, break down and electric shock, do not use this analyzer at the place where beside water, high moisture, dust or oily smoke.

KIMOTO ELECTRIC CO., LTD.
3-1FUNAHASHI-CHO,TENNOJI-KU,OSAKA 543-0024 JAPANTEL 06-6768-3401 FAX 06-6764-7040 E-mail:sales@kimoto-electric.co.jp
http://www.kimoto-electric.co.jp
This catalog is printed out in October 2015.

*) Specifications, design and size etc. described in this catalog are subject to change without notice.

721.03E