YOKOGAWA ZO21DW User manual

User’s
Manual In-Situ Type Zirconia Oxygen
Analyzer
Model ZO21DW
Detector
IM 11M03A02-00E
IM 11M03A02-00E
3rd Edition

<INTRODUCTION> i
IM 11M03A02-00E
INTRODUCTION
The zirconia oxygen analyzer is used for monitoring and controlling the combustion conditions of
processes in all elds which require combustion control. This zirconia oxygen analyzer features
the direct measurement of the oxygen concentration in a furnace by inserting the detector into the
furnace. However, for accurate measurement, it is preferable that there be no pressure di󰀨erence
between the measuring gas in contact with the sensor anode and the reference gas supplied on
the cathode side.
The Model ZO21DW zirconia oxygen detector is constructed in such a way that the reference
gas outlet is open to the inside of the furnace. Hence, the measured gas and reference gas
pressures can be kept at about the same level, making high accuracy measurements possible.
This instruction manual describes all the handling and operations of the Model ZO21DW Zirconia
Oxygen Detector, including installation, wiring, running, inspection, maintenance, etc. Read it
thoroughly before handling the detector in order to get a full demonstration of its performance.
For handling the converters associated with this detector, see the corresponding instruction
manual.
Before using the instruments, read any descriptions related to your instruments and system to
ensure the best performance.
User’s manual of instrument related to the ZO21DW is as follows:
Model Title Manual No.
ZR402G Separate Type Zirconia Oxygen Analyzer IM 11M12A01-02E
Media No. IM 11M03A02-00E 3rd Edition : Aug. 2018 (YK)
All Rights Reserved Copyright © 2009, Yokogawa Electric Corporation

<INTRODUCTION>
ii
IM 11M03A02-00E
For the safe use of this equipment
CAUTION
The cell (sensor) at the tip of the detector is made of ceramic (zirconia element). Do not drop the
detector or subject it to pressure stress.
• Do NOT allow the sensor (probe tip) to make contact with anything when installing the
detector.
• Avoid any water dropping directly on the probe (sensor) of the detector when installing it.
• Check the calibration gas piping before introducing the calibration gas to ensure that there
is no leakage of the gas. If there is any leakage of the gas, the moisture drawn from the
measured gas may damage the sensor.
• The detector (especially at the tip) becomes very hot. Be sure to handle it with gloves.
WARNING
The product is very heavy. Handle it with care. Be sure not to accidentally drop it. Handle safely
to avoid injury.
Connect the power supply cord only after conrming that the supply voltage matches the rating of
this equipment. In addition, conrm that the power is switched o󰀨 when connecting power supply.
Some process gas is dangerous to people. When removing this equipment from the process line
for maintenance or other reasons, protect yourself from potential poisoning by using a protective
mask or ventilating the area well.
nAbout This Manual
• This manual should be passed on to the end user.
• The contents of this manual are subject to change without prior notice.
• The contents of this manual shall not be reproduced or copied, in part or in whole, without
permission.
• This manual explains the functions contained in this product, but does not warrant that those
will suit the particular purpose of the user.
• Every e󰀨ort has been made to ensure accuracy in the preparation of this manual. However,
should any errors or omissions come to the attention of the user, please contact the nearest
Yokogawa Electric representative or sales o󰀩ce.
• This manual does not cover the special specications. This manual may not be changed
on any change of specication, construction and parts when the change does not a󰀨ect the
functions or performance of the product.
• If the product is used in a manner not specied in this manual, the safety of this product may
be impaired.

<INTRODUCTION> iii
IM 11M03A02-00E
l SafetyandModicationPrecautions
• Follow the safety precautions in this manual when using the product to ensure protection
and safety of personnel, product and system containing the product.
lThe following safety symbols are used on the product as well as in this
manual.
WARNING
This symbol indicates that an operator must follow the instructions laid out in this manual
in order to avoid the risks, for the human body, of injury, electric shock, or fatalities. The
manual describes what special care the operator must take to avoid such risks.
CAUTION
This symbol indicates that the operator must refer to the instructions in this manual in order
to prevent the instrument (hardware) or software from being damaged, or a system failure
from occurring.
CAUTION
This symbol gives information essential for understanding the operations and functions.
NOTE
This symbol indicates information that complements the present topic.
This symbol indicates Protective Ground Terminal.
This symbol indicates Function Ground Terminal. Do not use this terminal as the protective
ground terminal.

<INTRODUCTION>
iv
IM 11M03A02-00E
After-sales Warranty
nDo not modify the product.
nDuring the warranty period, for repair under warranty carry or send the
producttothelocalsalesrepresentativeorserviceo󰀩ce.Yokogawawill
replace or repair any damaged parts and return the product to you. Before
returning a product for repair under warranty, provide us with the model name
and serial number and a description of the problem. Any diagrams or data
explaining the problem would also be appreciated.
l If we replace the product with a new one, we won’t provide you with a repair report.
l Yokogawa warrants the product for the period stated in the pre-purchase quotation
Yokogawa shall conduct dened warranty service based on its standard. When the
customer site is located outside of the service area, a fee for dispatching the maintenance
engineer will be charged to the customer.
nIn the following cases, customer will be charged repair fee regardless of
warranty period.
• Failure of components which are out of scope of warranty stated in instruction manual.
• Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa
Electric did not supply.
• Failure due to improper or insu󰀩cient maintenance by user.
• Failure due to modication, misuse or outside-of-specications operation which Yokogawa
does not authorize.
• Failure due to power supply (voltage, frequency) being outside specications or abnormal.
• Failure caused by any usage out of scope of recommended usage.
• Any damage from re, earthquake, storms and oods, lightning, disturbances, riots, warfare,
radiation and other natural changes.
n Yokogawadoesnotwarrantconformancewiththespecicapplicationatthe
usersite.Yokogawawillnotbeardirect/indirectresponsibilityfordamagedue
toaspecicapplication.
n YokogawaElectricwillnotbearresponsibilitywhentheuserconguresthe
product into systems or resells the product.
n Maintenanceserviceandsupplyingrepairpartswillbecoveredforveyears
after the production ends. For repair for this product, please contact the
nearestsaleso󰀩cedescribedinthisinstructionmanual.

v
IM 11M03A02-00E
<CONTENTS>
Model ZO21DW
Detector
In-Situ Type Zirconia Oxygen Analyzer
CONTENTS
IM 11M03A02-00E 3rd Edition
INTRODUCTION .......................................................................................................i
For the safe use of this equipment.............................................................ii
After-sales Warranty ...................................................................................iv
1. SPECIFICATIONS ..................................................................................... 1-1
1.1 StandardSpecications................................................................................... 1-1
1.2 Model and Codes .............................................................................................. 1-2
1.3 External Dimensions ........................................................................................ 1-3
2. INSTALLATION ......................................................................................... 2-1
2.1 Installation Site.................................................................................................. 2-1
2.2 ProbeInsertionHole......................................................................................... 2-1
2.3 Detector Installation ......................................................................................... 2-2
3. PIPING........................................................................................................ 3-1
3.1 PipingforSystem1........................................................................................... 3-1
3.1.1 Parts Required for Piping in System 1 ...............................................3-2
3.1.2 Connection to the Calibration Gas Inlet ............................................. 3-2
3.1.3 Piping for the Reference Gas Inlet ..................................................... 3-3
3.2 PipingforSystem2........................................................................................... 3-4
3.2.1 Piping Parts for System 2 ..................................................................3-4
3.2.2 Piping for the Calibration Gas ............................................................ 3-5
3.2.3 Piping for the Reference Gas............................................................. 3-6
3.2.4 Valve Operation of Reference Gas Outlet ......................................... 3-6
3.3 PipingforSystem3.......................................................................................... 3-6
4. WIRING ...................................................................................................... 4-1
4.1 General............................................................................................................... 4-1
4.1.1 Cable Specication ............................................................................ 4-1
4.1.2 Wiring Procedure ............................................................................... 4-2
4.2 Wiring for Detector Output............................................................................... 4-3
4.2.1 Connection to the Detector ................................................................4-3
4.3 WiringforPowertoDetectorHeater............................................................... 4-4
4.3.1 Connection to Detector ......................................................................4-4
4.4 PowerandGroundingWiring.......................................................................... 4-5
4.4.1 Power Wiring ...................................................................................... 4-5
4.4.2 Grounding Wiring ............................................................................... 4-5

vi
IM 11M03A02-00E
<CONTENTS>
5. NAMEANDFUNCTIONOFCOMPONENTS........................................... 5-1
6. OPERATION .............................................................................................. 6-1
6.1 Start-Up .............................................................................................................. 6-1
6.1.1 Inspection of Piping and Wiring Conditions ....................................... 6-1
6.1.2 Checking of Set Valves ...................................................................... 6-1
6.1.3 Supplying Heater Power .................................................................... 6-1
6.1.4 Calibration .......................................................................................... 6-1
6.2 Stationary Operation ........................................................................................ 6-2
6.2.1 Checking Operating Conditions ......................................................... 6-2
6.2.2 Stopping and Restarting Operations ................................................. 6-2
7. INSPECTIONANDMAINTENANCE ........................................................ 7-1
7.1 Inspection and Maintenance of the Detector................................................. 7-2
7.1.1 Cleaning the Calibration Gas Tube .................................................... 7-2
7.1.2 Replacing the Sensor Assembly ........................................................ 7-3
7.1.3 Stopping and Re-starting Operation .................................................. 7-6
CustomerMaintenancePartsList........................................ CMPL11M06B02-01
Revision Information ...............................................................................................i

<1. SPECIFICATIONS> 1-1
IM 11M03A02-00E
1. SPECIFICATIONS
In this chapter, the specications of the ZO21DW detector is described.
1.1 StandardSpecications
The probe, as a whole, is not explosion-protected (Calibration gas inlet, reference gas outlet) and
only its terminal box section is explosion-protected.
Sample Gas Temperature:
0 to 600°C
SampleGasPressure:
-20 to +20 kPa
Insertion Length:
0.4, 1.0, 1.5, 2.0, 3.0 m
Ambient Temperature:
-10 to +70°C (terminal box temperature)
Reference-air Flow Rate:
800 ml/min. (Use instrument air. Reference gas is discharged into the furnace.)
Material in Contact with Gas:
SUS316, Zirconia, SUS304 (JIS) or ASTM grade 304 (ange)
Installation:
Flange mounting
Probe mounting angle; Between the horizontal and vertically down positions
Note: Probe protector (ZO21R-L-150-∗B/R, GS11M12A01-01E) is
required when insertion length is 3 m and horizontal installation.
Joint; Rc1/8
Flange; JIS 10K-100-FF, ANSI Class 150-4-RF, and DIN PN10 DN100-4
Construction:
The terminal box of ZO21DW ameploof specication
TIIS ameploof type certication
Protection Concept: d2G4
Weight:
With insertion length of 0.4 m, approx. 6.5 kg; 1.0 m, approx. 10.0 kg; 1.5 m, approx. 13.0 kg;
2.0 m, approx. 17.0 kg; 3.0 m, approx. 20.0 kg

<1. SPECIFICATIONS>
1-2
IM 11M03A02-00E
1.2 Model and Codes
Model Su󰀩xcode Option code Description
ZO21DW -L · · · · · · · · · · Probe with ameproof terminal box
Insertion length -040 · · · · · · · · · · 0.4 m
-100 · · · · · · · · · · 1.0 m
-150 · · · · · · · · · · 1.5 m
-200 · · · · · · · · · · 2.0 m
-300 · · · · · · · · · · 3.0 m
Flange joint connection -J · · · · · · · · · · JIS 10K-100-FF
-A · · · · · · · · · · ANSI Class 150-4-RF
-E · · · · · · · · · · DIN PN10 DN100-4
Style code *A · · · · · · · · · · Style A
Options /CV With check valve
/SV With stop valve
/G Cable glands (2 pieces) (Note1)
Note1: Cable gland [/G] must be specied when installed in hazardous area.
Name PartNo. Description
CABLE GLAND G7272YE Matal Fittings with resisting pressure. O. D.ø11 to ø13

<1. SPECIFICATIONS> 1-3
IM 11M03A02-00E
1.3 External Dimensions
Unit : mm
L ( *) 315
± 5
Flange
∅
42.7
Reference gas inlet
Rc1/8
C
( *) L = 400, 1000, 1500, 2000, 3000 (mm)
Reference gas return
Approx. 210
2-G3/4 Wiring hole
∅
150
Terminal box
t
Calibration gas inlet
Rc1/8
∅
B
∅
A
F1.1E.ai
48
ModelandSu󰀩x
codes
Length
L
(mm)
Flange
Flange A B C t Weight
(kg)
ZO21DW-L-040-J*A 400
JIS 10K-100-FF
( or equivalent ) 210 175 8 - ø19 18
Approx. 6.5
ZO21DW-L-100-J*A 1000 Approx. 10
ZO21DW-L-150-J*A 1500 Approx. 13
ZO21DW-L-200-J*A 2000 Approx. 17
ZO21DW-L-300-J*A 3000 Approx. 20
ZO21DW-L-040-A*A 400
ANSI CLASS 150-4-
RF
( or equivalent )
228.6 190.5 8 - ø19 24
Approx. 6.5
ZO21DW-L-100-A*A 1000 Approx. 10
ZO21DW-L-150-A*A 1500 Approx. 13
ZO21DW-L-200-A*A 2000 Approx. 17
ZO21DW-L-300-A*A 3000 Approx. 20
ZO21DW-L-040-E*A 400
DIN PN10-DN100-4
( or equivalent ) 220 180 8 -ø18 20
Approx. 6.5
ZO21DW-L-100-E*A 1000 Approx. 10
ZO21DW-L-150-E*A 1500 Approx. 13
ZO21DW-L-200-E*A 2000 Approx. 17
ZO21DW-L-300-E*A 3000 Approx. 20

Blank Page

<2. INSTALLATION> 2-1
IM 11M03A02-00E
2. INSTALLATION
2.1 Installation Site
The following should be taken into consideration when installing the detector :
(1) Easy access to the detector for checking and maintenance work.
(2) A location in which the ambient temperature is not too high (below 70°C) and the terminal
box is not subject to radiant heat.
(3) A clean environment without any corrosive gases.
(4) No vibration.
2.2 ProbeInsertionHole
When preparing the probe insert hole, the following should be taken into consideration :
CAUTION
• The outside dimension of detector may vary depending on its options. Use a pipe that is
large enough for the detector.
• If the detector is mounted horizontally, the calibration gas inlet and reference gas inlet
should face downwards.
• When using the detector with pressure compensation, ensure that the ange gasket does
not block the reference gas outlet on the detector ange. If the ange gasket blocks the
outlet, the detector cannot conduct pressure compensation. Where necessary, make a
notch in the ange gasket.
• The sensor (zirconia cell) at the probe tip may deteriorate due to thermal shock if water
drops are allowed to fall on it, as it is always at high temperature.
(1) The detector probe tip should not be pointed upward.
Note : If the probe tip is placed upward, the cell (sensor) in the probe tip may deteriorate due to condensation.
(2) If the insertion probe length is more than 2.5 meters, the detector should be attached almost
vertically (no more than a 5 tilt).
(3) The detector probe should be situated almost at a right angle to the gas ow to be analyzed
or, at the very least, the probe tip should be on the down ow side.

<2. INSTALLATION>
2-2
IM 11M03A02-00E
100 mm
100 mm
Eight-hole flange
(vertical) Bounds of the probe
insertion hole location
Flange matches
the detector specifiions
(horizontal)
Greater than
∅52 mm
F2.1E.ai
Note : Make sure the reference gas outlet of the detector is not blocked by the gasket on the ange surface.
Figure 2.1 Example of probe insertion hole
2.3 Detector Installation
CAUTION
The cell (sensor) at the tip of the detector is made of ceramic (zirconia). Do not drop the detector,
as inpact will damage it.
The gasket should be used on the flange surface to prevent gas leakage. The gasket material
should be heatproof and corrosion-proof.
The following should be taken into consideration when mounting the detector :
(1) Make sure the cell mounting screws (four pcs.) have not come loose.
(2) In a case where the detector is attached horizontally, the cable lead-in hole should face
downward.

<3. PIPING> 3-1
IM 11M03A02-00E
3. PIPING
This chapter describes the line - installation procedures for two typical system congurations of
the zirconia oxygen analyzer using the ZO21DW detector.
CAUTION
• Ensure that each check valve, stop valve and joint used for piping do not allow leakage.
Especially, if there is any leakage of the calibration gas from pipes and joints, it may cause
clogging of the pipes or incorrect calibration.
• Be sure to conduct leakage test after piping.
• Basically, apply instrument air (dehumidied by cooling to the dew point -20°C or lower, and
removing any dust, oil mist and the like) for the reference gas.
System 1 : Instrument air is used as the reference gas. Calibration is carried out manually with
the portable ZO21S standard gas unit. The zero gas and span gas (air) are supplied
from the standard gas unit to the detector by connecting the tube only when it is
calibrated.
System 2 : Instrument air is used as the reference gas. This instrument air is also used as the
span gas in calibration. The zero gas in calibration is supplied from the zero gas
cylinder.
System 3 : Basically the same as system 2. However, calibration is carried out automatically with
the converter which has a calibration-execution command function.
3.1 PipingforSystem1
The piping in System 1 is illustrated in Figure 3.1.
~
~
Model ZO21S Standard gas unit
EXAZR402G
ZO21DW Zirconia Oxygen
Analyzer, Detector
Model ZR402G Converter
Stop valve
Calibration gas
F3.1E.ai
100 to 240 V AC
100/110/115
200/220/240 V AC
Contact input
Analog output, Contact output
Digital output (HART)
Instrument air
Air Set
Signal
(6-core shield cable)
Heater (2-core)
Reference gas
Needle
valve
flowmeter
Figure3.1 PipingforSystem1
Piping in System 1 is as follows :
• Place a stop valve through a nipple at the calibration gas inlet of the detector, and mount
a joint for a ø6 × ø4 mm soft tube at the stop valve connection hole of the inlet side (see
Section 3.1.2). The tube is to be connected to this joint only during calibration.

<3. PIPING>
3-2
IM 11M03A02-00E
CAUTION
• The stop valve should be connected directly to the detector. If any piping is present between
the detector and the stop valve, water may condense in the pipe, which may cause damage
to the sensor by rapid cooling when the calibration gas is introduced. The stop valve should
be closed except while the calibration gas is being introduced.
• The reference gas should have an oxygen concentration identical to that of fresh air (21%).
3.1.1 PartsRequiredforPipinginSystem1
Check that the parts listed in Table 3.1 are ready.
Table3.1 Partsrequiredforpiping
Pipingsection Partsrequired Description
At the calibration
gas inlet
Stop valve Recommended by YOKOGAWA (L9852CB or G7016XH)
* Nipple R1/4 or 1/4 NPT On the open market
Tube connecting joint R1/4 or 1/4 NPT – ø6 × ø4 mm soft tube On the open market
At the reference
gas inlet
Air set Recommended by YOKOGAWA (K9473XH/K9473XJ)
Piping joint R1/4 or 1/4 NPT On the open market
Note: The parts with an asterisk (*) may not be required.
3.1.2 Connection to the Calibration Gas Inlet
When carrying out calibration, connect the piping (ø6 × ø4 mm tube) from the standard gas unit
to the calibration gas inlet of the detector. First, mount a stop valve (of a quality specied by
YOKOGAWA) on a nipple (found on the open market) as illustrated in Figure 3.2, and mount a
joint (also found on the open market) at the stop valve tip. (The stop valve may be mounted on
the detector prior to shipping the detector.)
Note 1: Mount the stop valve close to the detector.
F4.2E.EPS
NippleStop valve
Tube connection
joint
Figure 3.2 Connection to the calibration gas inlet

<3. PIPING> 3-3
IM 11M03A02-00E
3.1.3 PipingfortheReferenceGasInlet
Reference gas piping is required between the air source (fresh air) and the ow setting unit and
between the ow setting unit and the detector.
Insert the air set next to the ow setting unit in the piping between the air source and the ow
setting unit.
Use a ø6 × ø4 mm (or nominal size 1/4 inch) stainless steel pipe between the ow setting unit
and the detector.

<3. PIPING>
3-4
IM 11M03A02-00E
3.2 PipingforSystem2
Piping in System 2 is illustrated in Figure 3.3.
~
Model ZA8F flow setting unit
EXAZR402G
ZO21DW Zirconia Oxygen
Analyzer, Detector
Model ZR402G Converter
Reference
gas
Calibration gas
Needle
valve
flowmeter
Instrument air
Air Set
Calibration gas pressure regulator
Zero gas cylinder
Calibration gas
unit case
F3.3E.ai
Stop valve
or Check
valve
Span gas (Same as Zero gas Calibration)
Signal
(6-core shield cable)
Contact input
Analog output, Contact input
Digital output (HART)
Heater (2-core)
100 to 240 V AC
Figure3.3 PipingforSystem2
System 2 illustrated in Figure 3.3 requires piping as follows :
• Mount the check valve or stop valve through a nipple to the reference gas inlet of the
detector.
CAUTION
The stop valve should be connected directly to the detector. If any piping is present between the
detector and the stop valve, condensed water may be produced in the pipe, which may cause
damage to the sensor by rapid cooling when the calibration gas is introduced.
• Supply air pressure (ow) may vary depending on the furnace pressure. It is recommended
to use a ow gauge and an air set that is suitable for the furnace pressure.
CAUTION
When using the ZA8F Flow Setting Unit and ZR40H Automatic Calibration Unit, please note that
the supplying airow (pressure) will vary depending on the furnace pressure.
3.2.1 PipingPartsforSystem2
Check that the parts listed in Table 3.2 are ready.

<3. PIPING> 3-5
IM 11M03A02-00E
Table3.2 Pipingparts
Pipingsection Partsrequired Description
Calibration gas
piping
Stop valve or Check
valve
Recommended by YOKOGAWA (L9852CB or G7016XH for
Stop valve, E7042VR or E7042VV for Check valve)
* Nipple R1/4 or 1/4 NPT On the open market
Zero gas cylinder Recommended by YOKOGAWA (G7001ZC)
Regulator valve Recommended by YOKOGAWA (G7013XF or G7014XF)
Piping joint R1/4 or 1/4 NPT On the open market
At the reference
gas inlet
Air set Recommended by YOKOGAWA (K9473XH/K9473XJ)
Piping joint R1/4 or 1/4 NPT On the open market
Note : The parts with an asterisk (*) may not be required.
3.2.2 PipingfortheCalibrationGas
This piping is to be installed between the zero gas cylinder and the ZA8F ow setting unit, and
between the ZA8F ow setting unit and the ZO21DW detector.
The cylinder should be placed in a calibration gas unit case or the like to avoid any direct sunlight
or radiant heat so that the gas cylinder temperature does not exceed 40°C.
Mount a regulator valve (specied by YOKOGAWA) on the cylinder.
Mount a check valve or stop valve (specied by YOKOGAWA) on the nipple (found on the open
market) at the calibration gas inlet of the detector as illustrated in Figure 3.4.
(The check valve or the stop valve may have been mounted on the detector when shipped.)
Connect the ow setting unit and the detector to a stainless steel pipe ø6 × ø4 mm (or nominal
size 1/4 inch).
F4.8E.EPS
Stop valve or Check valve
Piping for the Calibration gas, ø6 × ø4 mm
Stainless steel pipe
Piping for the Reference gas, ø6 × ø4 mm
Stainless steel pipe
Figure3.4 Checkthevalveconnectiontothecalibrationgasinlet

<3. PIPING>
3-6
IM 11M03A02-00E
3.2.3 PipingfortheReferenceGas
Reference gas piping is required between the air source (instrument air) and the ow setting unit,
and between the ow setting unit and the detector.
Insert the air set next to the ow setting unit in the piping between the air source and the ow
setting unit.
Use a ø6 × ø4 mm (or nominal size 1/4 inch) stainless steel pipe between the ow setting unit
and the detector.
3.2.4 ValveOperationofReferenceGasOutlet
1. For safety, stop the furnace that the detector is to be installed in. If furnace internal pressure
is high, this is especially dangerous.
2. Before starting instrument air ow, completely shut the stop valve in front of the reference
gas outlet.
3. Check that the reference gas outlet is not blocked by a ange gasket or the like.
4. Set the instrument air pressure higher than furnace internal pressure.
5. Completely open the stop valve in front of the reference gas outlet and, after turning on
instrument air ow, start furnace operation. As furnace internal pressure rises, conrm
that instrument air continues to ow and adjust the valve or increase supply pressure if
necessary.
6. After furnace internal pressure stabilizes, adjust ow.
7. If furnace operation is stopped, stop instrument air ow and completely shut the stop valve
in front of the reference gas outlet. You may leave reference gas owing if you wish.
3.3 PipingforSystem3
Piping in System 3 is illustrated in Figure 3.5. In System 3, calibration is automated but the piping
is basically the same as that of System 2. See section 3.2.
Instrument air
Calibration gas pressure regulator
Air Set
Needle
valve
flowmeter
Reference gas
Calibration gas
Check valve ~
Zero gas cylinder
Model ZR40H Auto Calibration unit
ZO21DW Zirconia Oxygen
Analyzer, Detector Model ZR402G Converter
Calibration gas
unit case F4 .9 E. EPS
EXA ZR402G
100 to 240 V AC
Contact input
Analog output, contact output
Digital output (HART)
Signal
(6-core shield cable)
Heater (2-core cable)
Figure3.5 PipingforSystem3

<4. WIRING> 4-1
IM 11M03A02-00E
4. WIRING
In this Chapter, the wiring necessary for connection to the Model ZO21DW detector is described.
4.1 General
CAUTION
NEVER supply current to the converter or any other device constituting a power circuit in
combination with the converter, until all wiring is completed.
4.1.1 CableSpecication
Cable specifications are shown in Table 4.1.
Table4.1 Cablespecications
Terminal name of converter Name Need for shields Cable type Number of wires
CELL+, CELL-
HTR TC+, HTR TC-
CJ+, CJ-
Converter signal ○CVVS 6
HEATER Converter heater CVV 2
L, N, Power supply CVV 2 or 3 *
AO-1+, AO-1-, AO-2+, AO-2- Analog output ○CVVS 2 or 4
DO-1, DO-2, DO-3, DO-4 Contact output CVV 2 to 8
AC-Z, AC-S, AC-C
Automatic Calibration unit CVV 3
DI-1, DI-2, DI-C Contact input CVV 3
Note *: When the case is used for protective grounding, use a 2 cores cable.
CAUTION
• Select suitable cable O.D. to match the cable gland size.
• Protective grounding should be connected in ways equivalent to JIS D type (Class 3
grounding), (the grounding resistance is 100 Ω or less).