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Continuous Gas Analyzer, extractive
OXYMAT 64
General information
2/130 Siemens PA 01 · 2012
2
■Overview
 
The OXYMAT 64 gas analyzer is used for the trace measurement
of oxygen.
■Benefits
• High linearity
• Compact design
• Open interface architecture （RS 485, RS 232, PROFIBUS）
• SIPROM GA network for maintenance and service information
（option）
■Application
• Production of technical gases
Measurements in N2 and CO2
• Welding
Measurements in protective gases during welding of highly al-
loyed steels, titanium, etc.
• Systems for air separation
Measurements in N2 and in inert gases （e.g. Ne, Ar）
Measurements in CO2
• Food production
Measurement in CO2 （e.g. breweries）
• Electronics industry
Low-pressure version with pump
• Flow soldering systems
■Design
• 19" rack unit with 4 HU for installation
- in hinged frame
- in cabinets with or without escope rails
• Front plate for service purposes can be pivoted down
（laptop connection）
• Connections for sample gas
- Input: Clamping ring connection for a pipe diameter of 6 mm
or ¼"
- Output: Pipe connection with diameter 6 mm or ¼"
• High-pressure and low-pressure versions
• Catalytically active and inactive cell
Display and control panel
• Large LCD field for simultaneous display of
- Measured value
-Status bar
- Measurement ranges
• Contrast of the LCD field adjustable via the menu
• Permanent LED backlighting
• Washable membrane keyboard with five softkeys
• Five-digit measured-value display
（decimal point counts as one digit）
• Menu-driven operation for parameterization, configuration,
test functions, adjustment
• Operator support in plain text
• Graphical display of the concentration progression; time inter-
vals parameterizable
• Bilingual operating software German/English,
English/Spanish, French/English, Spanish/English,
Italian/English
• Switchover from ppm measuring range to % measuring range
Input and outputs
• One analog output per medium （from 0, 2, 4 to 20 mA; NAMUR
parameterizable）
• Six binary inputs freely configurable （e.g. for measurement
range switchover, processing of external signals from sample
preparation）
• Six relay outputs freely configurable （failure, maintenance
request, maintenance switch, threshold alarm, external sole-
noid valves）
• Two analog inputs configurable （e.g. correction of cross-
interference, external pressure sensor）
• Extension with eight additional binary inputs and eight addi-
tional relay outputs, e.g. for autocalibration with up to four
calibration gases
Communication
RS 485 present in basic unit （connection from the rear）.
Options
• RS 485/RS 232 converter
• RS 485/Ethernet converter
• RS 485/USB converter
• Connection to networks via PROFIBUS DP/PA interface
• SIPROM GA software as the service and maintenance tool
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
General information
2/131 Siemens PA 01 · 2012
2
 
OXYMAT 64, membrane keyboard and graphic display
Designs – Parts touched by sample gas, standard 
Status line to display
the analyzer status
（programmable）
LED backlit graphic
display and
membrane keyboard
with noticeable click
Display of
concentrations as
numbers and bargraph
Display of
start-of-scale and
full-scale values
Keyboard to
enter values
CLEAR key
to delete inputs
ENTER key
to accept
input values
MEAS key
to return to
measurement mode
INFO key
for help in plain text
ESC key
to abort inputs
Display of current
measuring ranges
Easy operation
menu controlusing
the softkeys
Two code levels
according to NAMUR
（maintenance and
specialist level）
Gas path 19" rack unit
Sample gas path Bushing
Pipe inlet
O2 sensor
Bypass line
Connection pieces
Stainless steel, mat. no. 1.4571
Stainless steel
ZrO2 ceramic
FPM （Viton）
PTFE （Teflon）
Pressure sensor Enclosure
Diaphragm
Sensor adapter
Bypass restrictor
Polycarbonate
SiO4
Aluminum
Stainless steel, mat. no. 1.4571
Flow indicator Measurement pipe
Variable area
Suspension boundary
Angle pieces
Duran glass
Duran glass, black
PTFE （Teflon）
FKM （Viton）
Pressure switch Enclosure
Membrane
Polycarbonate
NBR
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
General information
2/132 Siemens PA 01 · 2012
2
Gas path （high-pressure version）
 
 
Gas path OXYMAT 64, high-pressure version
The sample gas pressure （2 000 to 6 000 hPa） is regulated by the pressure regulator （3） at approx. 2 000 hPa or is provided by the
operator with 2 000 hPa. This pressure is applied at the restrictor （10）. The restrictor （10） reduces the pressure such that a sample
gas flow of 15 to 30 l/h is created. This flow is subdivided via the sample gas restrictor （11） and the adjustable bypass restrictor （6）
such that there is a sample gas flow of 7.5 l/h through the sensor.
If the sample gas can flow off into the atmosphere unhampered, the sample gas pressure corresponds to the atmospheric pressure.
If the sample gas flows off via an exhaust gas line, it works like a flow resistance. If the resulting dynamic pressure exceeds
100 hPa （rel.）, a maintenance request is output.
Legend for the gas path figure
1 Sample gas inlet; inlet pressure 5 Pressure sensor
- without internal pressure regulator: 2 000 hPa （abs.）, regulated 6 Bypass restrictor
- with internal pressure regulator: 2 000 ... 6 000 hPa （abs.）
7 Pressure switch
2 Sample gas outlet; sample gas flows off free of dynamic pressure 8 Flow measuring tube
3 Pressure regulator （order version） 9 Purging gas connection
4O2 sensor 10 Restrictor
O2 sensor
（KAZ /KIZ）
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
General information
2/133 Siemens PA 01 · 2012
2
Gas path （low pressure）
 
 
Gas path OXYMAT 64, low-pressure version
With the low-pressure version, the sample gas flow must be set externally to 125 ml/min. With a built-in pressure switch, the sample
gas pressure is approx. 30 hPa above the current atmospheric pressure since the sample gas flows off via a restrictor. If the resulting
dynamic pressure exceeds 100 hPa （rel.）, a maintenance request is output. In order to reduce the 90 % time, we recommend instal-
lation of a bypass upstream of the gas inlet which then provides a faster exchange of gas. This is particularly important with long
sample gas lines between the gas sampling point and the analyzer. Please make absoluy sure that the flow in the OXYMAT 64
does not exceed 125 ml/min.
Legend for the gas path figure
1 Sample gas inlet; flow 125 ml/min （7.5 l/h） 5 Pressure switch
2 Sample gas outlet; sample gas flows off free of dynamic pressure 6 Flow measuring tube
3O2 sensor 7 Purging gas connection
4 Pressure sensor 8 Restrictor
O2 sensor
（KAZ /KIZ）
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
General information
2/134 Siemens PA 01 · 2012
2
■Function
The measuring cell consists of a cylindrical （pipe-shaped） ZrO2
membrane. The sample gas （low O2 content） flows at a constant
rate through the inside of the membrane, which is regulated at
650 °C. The exterior of the sensor is exposed to the ambient air
（approx. 21 % O2）.
Both sides of the ZrO2 membrane are coated with thin platinum
films that act as electrodes. This forms a solid, electrochemical
cell. The amount of oxygen atoms ionized depends on the oxy-
gen concentration at the electrodes.
The differences in concentration at each side means that a dif-
ferential partial pressure prevails. Since ZrO2 conducts ions at
650 °C, ionic migration takes place in the direction of the lower
partial pressure.
An oxygen gradient arises across the width of the ZrO2 mem-
brane, which, according to equation （1）, results in an electrical
potential difference between the platinum electrodes.
Defects in the crystal lattice, caused by contamination of the
ZrO2 material with Y2O3 and/or CaO （introduced originally to
prevent cracks forming in ceramic material） make it easier for
O2 ions to diffuse in the ZrO2 grid.
Catalytically active ZrO2 sensor （CAZ）
The electrode material is made of platinum （Pt）. This type of sen-
sor has a higher cross-sensitivity when flammable accompany-
ing gas components are present.
Catalytically inactive ZrO2 sensor （CIZ）
The catalytically inactive sensor has the same general design as
the CAZ. The contacts and electrode surface inside the pipe are
made of a specially developed material which largely prevents
catalytic oxidation except of H2, CO and CH4.
 
OXYMAT 64, principle of operation
Measuring effect
U = UA + RT/4F （In [O2,air] - In [O2] （equation 1）
U measuring effect
UA asymmetric voltage （voltage, at [O2] = [O2,air]
T ceramic temperature
[O2,air] O2 concentration in the air
[O2] O2 concentration in sample gas
Note
The sample gas must be fed into the analyzer free of dust. Con-
densation should be avoided. Therefore, gas modified for the
measuring tasks is necessary in most application cases.
Calibration of the calibration point is carried out as with the other
analyzers of Series 6 after a maximum of 14 days by connecting
the calibration gas O2 in residual N2 at concentrations of approx.
60 to 90 % of the master measuring range.
Contrary to the other analyzers of Series 6, the zero point calibra-
tion cannot be carried out using pure nitrogen, but with a "small"
concentration of oxygen in nitrogen appropriate to the selected
measuring range （e.g.: measuring range 0 … 10 vpm; calibra-
tion gas approx. 2 ppm O2 in residual N2）.
Essential characteristics
• Four measurement ranges freely parameterizable, all mea-
surement ranges linear
• Galvanically isolated measurement value output 0/2/4 through
20 mA （also inverted） and as per NAMUR
• Autoranging selectable; possibility of remote switching
• Storage of measured values possible during adjustments
• Wide range of selectable time constants （static/dynamic noise
suppression）; i.e. the response time of the device can be
adapted to the respective measuring task
• Easy handling thanks to menu-driven operation
• Low long-term drift
• Two control levels with their own authorization codes for the
prevention of accidental and unauthorized operator interven-
tions
• Automatic, parameterizable measuring range calibration
• Operation based on the NAMUR recommendation
• Monitoring of the sample gas （via pressure switch）
• Customer-specific analyzer options such as:
- Customer acceptance
-TAG labels
- Drift recording
• Simple handling using a numerical membrane keyboard and
operator prompting
• Smallest span 0 to 10 vpm O2
• Largest span 0 to 100 % （testing with ambient air）
• Internal pressure sensor for correction of the influence of sam-
ple gas pressure fluctuations

1
 
2
3
4
5
6
7
Pipe made of ZrO2
 and Y2
O3
 or
ceramic CaO-mixed oxide
Ceramic protective coating
Sample electrode （Pt）
Reference electrode （Pt）
Thermoelement
Contact to reference electrode
Contact to sample electrode
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
General information
2/135 Siemens PA 01 · 2012
2
Influence of interfering gas
Catalytically active sensor （CAZ）
Very large cross-interference of all combustible accompanying
gases. Thus not suitable for use with combustible accompany-
ing gases!
Catalytically inactive sensor （CIZ）
There is only a slight cross-interference in the case of accompa-
nying gases with a concentration in the range of the O2 concen-
tration. H2, CO and CH4 still have a noticeable effect in the case
of flammable accompanying gas components.
 
Examples of typical diagonal gas offsets on a catalytically inactive sensor
The listed deviations depend on the exemplar and can deviate
up to ± 0.2 vpm. The actual deviation must be determined indi-
vidually or the error will be eliminated through a corresponding
calibration measure （displacement of the diagonal gas offset）.
Measured component / interfering gas Diagonal gas offset
78 vpm O2/140 vpm CO -6.1 vpm
10 vpm O2/10 vpm CO -0.6 vpm
74 vpm O2
/ 25 vpm CH4 -0.3 vpm
25 vpm O2
/ 357 vpm CH4 -1.1 vpm
25 vpm O2 / 70 vpm H2 -3 vpm
5 vpm O2 / 9.6 vpm H2 -0.55 vpm
170 vpm O2 / 930 vpm C2H4 -118 vpm
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
19" rack unit
2/136 Siemens PA 01 · 2012
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■Technical specifications
 
General
Measurement ranges 4, internally and externally switch-
able; automatic measuring range
switchover also possible
Smallest possible span
（relating to sample gas pressure
1 000 hPa absolute,
0.5 l/min sample gas flow, and
25 °C ambient temperature）
0... 10vpmO2
Largest possible measuring span  0... 100%
Operating position Front wall vertical
Conformity CE mark in accordance with
EN 50081-1, EN 50082-2 and RoHS
Design, enclosure
Degree of protection  IP20 according to EN 60529
Weight Approx. 11 kg
Electrical characteristics
EMC
（Electromagnetic Compatibility）
In accordance with standard
requirements of NAMUR NE21
（08/98） and EN 61326
Electrical safety In accordance with EN 61010-1,
overvoltage category II
Power supply 100 ... 120 V AC （nominal range of
use 90 ... 132 V）, 48 ... 63 Hz or
200 ... 240 V AC （nominal range of
use 180 ... 264 V）, 48 ... 63 Hz
Power consumption Approx. 37 VA
Fuse values 100 ... 120 V: 1.0T/250
200 ... 240 V: 0.63T/250
Gas inlet conditions
Sample gas flow
• through the sensor 7.5 l/h
• Overall consumption 15 ... 30 l/h
Permissible sample gas pressure
• without internal pressure
regulator
2 000 hPa （abs.）
• with internal pressure regulator 2 000 ... 6 000 hPa （abs.）
Sample gas temperature Min. 0 ... max. 50 °C, but above the
dew point
Sample gas humidity < 1 % relative humidity
Dynamic response
Warm-up period At room temperature < 30 min
（the technical specification will be
met after 2 hours）
Damping （electrical time
constant）
0 ... 100 s, parameterizable
Dead time （high-pressure ver-
sion） （purging time of the gas
path in the unit at 125 ml/min）
10 ... 30 s
Dead time （low-pressure version
without pump）
<5s
Dead time （low-pressure version
with pump）
<10s
Time for device-internal signal
processing
<1s
Pressure correction range
Pressure sensor internal 800 ... 1 100 hPa （abs.）
Measuring response （referred to sample gas pressure 1 013 hPa abso-
lute, sample gas flow 7.5 l/min, and ambient temperature 25 °C）
Output signal fluctuation < ± 1 % of the smallest possible
measuring range according to rat-
ing plate, with electronic damping
constant of 1 s
Zero point drift < ± 1 % of the current span/month
Measured-value drift < ± 1 % of the current span/month
Repeatability < 3 % of the current measuring
span
Detection limit 1 % of current measuring range,
< 0.1 vpm in measuring range
0... 10vpm
Linearity error < 2 % of the current measuring
span
Influencing variables （relating to sample gas pressure 1 013 hPa abso-
lute, 7.5 l/min sample gas flow and 25 °C ambient temperature）
Ambient temperature < 2 %/10 K referred to current mea-
suring span
Sample gas pressure only possi-
ble if the sample gas can flow out
into the ambient air
• When pressure compensation has
been switched off: < 1 % of current
span/1 % pressure change
• When pressure compensation has
been switched on: < 0.2 % of cur-
rent span/1 % pressure change
Residual gases, deviation from
zero point
• Catalytically active sensor
（CAZ）
Only gases with non-combustible
residual gas components can be
introduced
• Catalytically inactive sensor
（CIZ）
Residual gas concentration of
10 vpm H2; CO and CH4 have a
lower cross-interference; higher
HCs are negligible
Sample gas flow < 2 % of the smallest possible span
with a change in flow of 10 ml/min
Power supply < 0.1 % of the current measuring
range with rated voltage ± 10 %
Electrical inputs and outputs
Analog output 0/2/4 ... 20 mA, 4 … 20 mA
（NAMUR）, isolated; max. load
750 Ω
Relay outputs 6, with changeover contacts,
freely parameterizable, e.g. for
measuring range identification;
load: 24 V AC/DC/1 A, isolated
Analog inputs 2, dimensioned for 0/2/4 … 20 mA
for external pressure sensor and
correction of influence of residual
gas （correction of cross-interfer-
ence）
Binary inputs 6, designed for 24 V, isolated, freely
parameterizable, e.g. for measure-
ment range switchover
Serial interface RS 485
Options AUTOCAL function each with
8 additional binary inputs and relay
outputs, also with PROFIBUS PA or
PROFIBUS DP
Climatic conditions
Permissible ambient temperature -40 ... +70 °C during storage and
transportation, 5 … 45 °C during
operation
Permissible humidity < 90 % relative humidity as annual
average, during storage and trans-
portation （must not fall below dew
point）
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
19" rack unit
2/137 Siemens PA 01 · 2012
2
D） Subject to export regulations AL: 9I999, ECCN: N
Selection and ordering data Order No.
OXYMAT 64 gas analyzer
19" rack unit for installation in cabinets
D） 7MB2041- 7771 7 - 7A77 Cannot be combined
Sensor
ZrO2: Catalytically active cell （CAC） 0 0
ZrO2: Catalytically inactive cell （CIC） 1 1
ZrO2: Catalytically active cell （CAC）; with differential pressure sensor 2 2
ZrO2: Catalytically inactive cell （CIC）; with differential pressure sensor 3 3
Sample gas pressure
High pressure, without pressure regulator 2 000 hPa （abs.） A A
High pressure, with pressure regulator 2 000 ... 6 000 hPa （abs.） B B
Low pressure, with pump Atmosphere C C
Low pressure, without suction pump Atmosphere D D
Gas connection
Input Clamping ring connection 6 mm A
Output Fittings 6 mm
Input Clamping ring connection ¼" B
Output Fitting ¼" 
Add-on electronics
Without 0
AUTOCAL function
• With 8 additional binary inputs/outputs 1
• With 8 additional binary inputs/outputs and PROFIBUS PA interface 6
• With 8 additional binary inputs/outputs and PROFIBUS DP interface 7
Power supply
100 to 120 V AC, 48 to 63 Hz 0
200 to 240 V AC, 48 to 63 Hz 1
Explosion protection
Without A
Language
German 0
English 1
French 2
Spanish 3
Italian 4
Additional versions Order code
Add "-Z" to Order No. and specify Order code
escopic rails （2 units） A31
TAG labels （specific inscription based on customer information） B03
Clean for O2 service （specially cleaned gas path） Y02
Measuring range indication in plain text, if different from the standard setting Y11
Special setting
（only in conjunction with an application no., e.g. extended measuring range）
Y12
Extended special setting
（only in conjunction with an application no., e.g. determination of cross-interferences）
Y13
Retrofitting sets Order No.
RS 485/Ethernet converter A5E00852383
RS 485/RS 232 converter C79451-Z1589-U1
RS 485/USB converter A5E00852382
AUTOCAL function each with 8 binary inputs/outputs C79451-A3480-D511
AUTOCAL function 8 binary inputs/outputs each and PROFIBUS PA A5E00057307
AUTOCAL function 8 binary inputs/outputs each and PROFIBUS DP A5E00057312
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
19" rack unit
2/138 Siemens PA 01 · 2012
2
■Dimensional drawings
 
OXYMAT 64, 19" rack unit, size in mm
2;<0$7

s
M4M4
86.5
384.5
27.5
15.6
173 128
172
149.5
82
440
0
36
104
132
320
345
411.5
4
351.5
465
483
37.7
101.6
177
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
19" rack unit
2/139 Siemens PA 01 · 2012
2
■Schematics
Pin assignment （electrical connections）
 
OXYMAT 64, 19" rack unit, pin assignment
0
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0
0
0
0
0
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© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
19" rack unit
2/140 Siemens PA 01 · 2012
2
 
OXYMAT 64, 19" rack unit, pin assignment of the AUTOCAL plate and PROFIBUS plug
37
36
35
34
33
29
30
31
32
18
17
16
14
13
12
11
10
9
8
7
6
5
28
27
26
25
24
4
3
2
1
23
22
21
20
19
15
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
M
Connector SUB-D 37F （option）
M
Relay 9
Relay 10
Relay 11
Relay 12
Relay 13
Relay 14
Relay 7
Relay 8
GND
Contact load
max. 24 V/1 A, AD/DC
for shown
relay contact position,
the relay has zero current
GND
Binary input 14-P
NC
NC
Isolated
via optocoupler
"0" = 0 V （0 ... 4.5 V）
"1" = 24 V （13 ... 33 V）
Binary input 13-P
Binary input 12-P
Binary input 11-P
Binary input 10-P
Binary input 9-P
Binary input 8-P
Binary input 7-P
Binary input 7 to 14-N
Connector SUB-D 9F-X90
PROFIBUS DP
Connector SUB-D 9M-X90
PROFIBUS PA Optional
VP /+ 5 V
DGND
RxD/TxD-P （B）
RxD/TxD-N （A）
CNTR-P/direction control
PA-P（+）
PA-N（-）
CNTR-N
1RWH
$OOFDEOHVWRWKHFRHFWRUVRUWHUPLQDOEORFNVPXVWEH
VKLHOGHGDQGUHVWDJDLQVWWKHHQFORVXUHSRWHQWLDO
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
19" rack unit
2/141 Siemens PA 01 · 2012
2
Gas connections and pin assignment
 
OXYMAT 64, 19" rack unit, gas connections and electrical connections
12
Gas connections
Sample gas inlet:  Clamping ring connection 6 mm or ¼"
Sample gas outlet:  Fittings 6 mm or ¼"
Mains connection
and miniature
fuses
37-pin connector:
Binary inputs and
relay outputs （optional）
25-pin connector:
Binary inputs and
relay outputs
9-pin
interface
connector
（Optional）:
e.g.
PROFIBUS
9-pin
connector:
RS 485
15-pin connector:
Binary inputs and
analog inputs/outputs
Sample gas inlet Sample gas outlet
Purge gas
inlet
© Siemens AG 2011Continuous Gas Analyzer, extractive
OXYMAT 64
Documentation
2/142 Siemens PA 01 · 2012
2
■Selection and ordering data
 
D） Subject to export regulations AL: 9I999, ECCN: N
■Selection and ordering data
 
F） Subject to export regulations AL: N, ECCN: EAR99H
Operating instructions Order No.
OXYMAT 64
Gas analyzer for measuring trace oxygen
•German A5E00880382
• English A5E00880383
•French A5E00880384
• Spanish A5E00880385
•Italian A5E00880386
Gas analyzers of Series 6 and
ULTRAMAT 23
Schnittsle/Interface PROFIBUS DP/PA
• German and English D） A5E00054148
Suggestions for spare parts
Description 7MB2041 2 years
（quantity）
5 years
（quantity）
Order No.
Pressure regulator as spare part x – 1 A5E01008972
Flowmeter x – 1 A5E01061561
Adapter plate, LC display/keypad x 1 1 C79451-A3474-B605
LC display x – 1 W75025-B2001-B1
Connector filter x – 1F） W75041-E5602-K2
Fuse, T 0.63 A, line voltage 200 … 240 V x 2 4 W79054-L1010-T630
Fuse, T 1 A, line voltage 200 … 240 V x 2 4 W79054-L1011-T100
© Siemens AG 2011