Ozone Analyzer
model OA-781
Ozone is the causative agents such as the photochemical oxidant smog. OA-781 is an continuous
analyzer that measures the ozone concentration inambient air by a non dispersive ultraviolet absorption
method (NDUV) complying with JIS B 7957.

Reliability improves by adopting the ozone
scrubber checker (optional).

Large capacity memory to save measured datafor over a year.

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

USB memory for general-purpose is available todata extraction

Easy to maintenance by adopting a fold typeslide front panel.

Ethernet interface is available as standard
equipment for digital telemetering

General Specifications
Measuring object

Ozone (O3) in ambient air

Interference

Measuring method

Non dispersive ultraviolet adsorption method(JIS B 7957)

4 ppb or less (by Toluene 1 ppm)
4 ppb or less (by Humidity 80%RH, 25oC)

Warming-up timewithin 3 hour

Measuring range *0 - 1ppm

0 - 40 C

Analog output range *0 - 0.1/ 0.2/ 0.5/ 1.0 ppm
4-ranges auto/manual switching*Starting range is selectable*Fixed range is also available

Permissible ambient
temperature range
Sample flow rate

approx. 1L/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, AlertoRepeatability±1％ of span gas concentration

Zero drift±1 ppb/ week

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

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

Digital IN/OUT

Ethernet, USB1.1, RS232C

Stability to voltagefluctuation±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 ±1ppb / 5 CoSpan: within ±2%/ 5 C of span gas conc.

Analog output for
telemeter (optional) *Degradation efficiencyof ozone scrubber

99.5% or more

DC 0 - 1V : Continuous data, 1h mean value
Contact signal : Output range, external reset,
adjusting, power discontinuity, disconnecting,system failure, etc.

Power requirement

AC100V 50/ 60Hz approx. 200VA

Response time

2 minutes or less (T90)

Withstand voltage test

AC1000V 50/ 60Hz during 1 min.

Detection limit

1 ppb or lessInsulation resistancemore than 5 MegohmoStability of sample flow within ±5%/ 10 days

*For further information, please contact us.

Optional
Rack mount

A17: H875mm rollaway rack
A22: H1100mm rollaway rack

RecorderSerial recorder
Chart width:180mm

Analog I/O unit for atelemeter

TU07 : terminal block(Rear connection with rack mount)Flow Diagram

Suction pump*Ozone scrubber checker (Optional)

Ozone
remover 2Pressure sensor
for zero gas

PV2

NONC

V3

NONCC

Orifice1

Ozone
genarator

Valve for ozone

Zero gas
generator

Regulator

C

Valve for zero gas

Detector
forreference

Orifice2LightsourceDryer

SAMPLEINLETChekingpump

Filter forzero gas

NOPC
NC

Dust
filter

V1

Measuring
Cell

Valve forsample/ozone

Ozone
scrubberT
Temperature
sensorNeedle valve

Flow
SensorPressure
sensor

Detectorfor sample

Ozone
remover 1

Dimensions
485

485

590

230

490

875

Desktop type (approx.13 kg without pump)Unit: mm

Product CodeOA-781Rack-mount type (A17) (approx.42kg incl. pump)

T1
A1
A2

Desktop type
A17 Rack
A22 Rack

R0Serial Recorder
No useT0Analog I/O unit for a Telemeter TU07
No useSG0Ozone scrubber checker
Zero gas generator
No useCAUTION*) 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.

781.03E