Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 14)

IM 12J05D02-01E
1-6 Introduction
1-5. System Configuration
(For DO30G)
Output Signal：
4 to 20 m A DC or
0 to 20 m A DC

DO30G

DOX8A

DOX8 W

DO70G  DO402G
 WTB10-DO3
Alarm Contact Output
4-Contact Point，High/Low Alarm
Cleaning Time，Alarm Contact
HOLD Contat
100V AC±15%
115V AC±15%
230V AC±15%

Guide Pipe
PH8HG

Submersion Type Holder
DOX8HS
 Suspension Type Holder
HH350G
F01.EPS

Floating Ball Holder
PB350G
Dissolved Oxygen Sensor
Spere Parts Set
Holders, Holders with Cleaning System Dissolved Oxygen Converter
PB360G
Calibration Set
 DOX10
(For DO30G)
（For DO30G）
(For DO30G)
(For DO70G)
Select pin terminal
for DO402G.
No Cleaning Jet Cleaning
Terminal Box
Power Supply Unit
1-5-1. Dissolved Oxygen Sensor
The DO402G can be used with a variety of sensors. Some specific programming may be necessary to
match the converter with the sensor.
a. DO70G sensor
This sensor features temperature compensation with a 22k NTC RTD. The nominal output of this
sensor is 60 nA in air under reference conditions. Before use, enter the service mode. Select service
code 01 (*S.TYPE) and set it to 1 (polarographic sensor), then press the ENT key. Select *1.CELL2.9
and set the nominal output to 60 nA. Next, select service code 10 (*T.SENS) and set it to 3 (22k
NTC). Then select service code 21 (*0.CAL) and set it to 1 (zero calibration enabled) because two-
point calibration by air-saturated water calibration and zero calibration are required.
For details, refer to GS12J05D04-01E.
b. Model DOX8SM sensor
This sensor is a galvanic sensor with a PB36 type temperature compensator and a 25 micron
membrane (1 mil).
This sensor has a nominal output current of 7.5µA in ambient air under reference conditions. In
Service code 01 selection 1 must be programmed when this sensor is used. The membrane check
is inactive with this sensor unless external solution ground is used. ( metal holder or sample line )
c. Model DO30G sensor
This sensor is essentially the same as the DOX8SM sensor, but it has a 50 micron membrane,
fixed sensor cable, Pt1000 RTD temperature compensation and integral solution ground that allows
membrane checking. The nominal output of this sensor is 3.75 µA in air under reference conditions.
In Service item ”*I.CELL” selection 0 must be programmed when this sensor is used.
For details, refer to GS12J05D03-01E.
d. Model DO30 sensor
This sensor is specified in GS12J6K4 and it can be supplied with 50 or with 25 micron membrane.
Normally 50 micron membrane is used and no reprogramming is necessary. Otherwise Service
code 01 setting must be changed from 0 to 1.