Oxygen Analyzers
XTP601 Series
Oxygen Analyzer for Safe or Hazardous Areas
A robust, linear and stable oxygen analyzer for measurements in gases such as hydrogen,
nitrogen, biogas, or carbon dioxide. The sensor is housed in a rugged IP66 casing, making
it suitable for a wide range of applications. When supplied with fl ame arrestors, the analyzer
becomes explosion-proof and certifi ed for use in hazardous areas.
Highlights
• General purpose or ATEX, IECEx, CCSAUS, TC, TR &
Ex hazardous area certifi ed models.
• Ranges available: 0–0.5% up to 0–50% &
20, 80 or 90–100%
• Touch-screen display allows calibration or adjustment
without the need for a hot works permit
• Intrinsic error (accuracy) is better than 1% full scale
• Zero span stability better than 0.25% of span per
month
• Outputs include RS485 and two 4-20mA (following
NAMUR NE 44 standard).
• Low cost of ownership due to minimal maintenance
and no consumable parts
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Applications
• Monitoring inert blanketing gases for hydrocarbon
processing
• Inert gas for pharmaceutical or chemical industries
• Biogas, waste, landfi ll and digester plants
• Furnace gas control in steel industry
• Catalyst regeneration
• N
generators
2
• O
generators
2
Oxygen Analyzers
XTP601 Oxygen Analyzer
For Safe or Hazardous Areas
When a process oxygen application demands high accuracy
and stability, along with low maintenance cost; paramagnetic
oxygen technology is usually preferred. If, in addition, the
application calls for a rugged and reliable, corrosion resistant
analyzer, the thermo-paramagnetic principle of Michell’s new
XTP601 series makes it the instrument of choice.
The XTP601 series oxygen analyzer from Michell Instruments
is designed to measure the percentage of oxygen in process
gases. Using thermo-paramagnetic technology, the sensor
is reliable and highly stable. The XTP601 is housed in an
explosion-proof case and is rated ATEX Zone 1 for use in
hazardous areas. For installation in non-hazardous areas, a
general purpose version is available.
Features
Excellent accuracy
Oxygen measurements are highly susceptible to pressure
variations because they are generally based on the partial
pressure of oxygen. For an non-corrected analyzer, a 1%
change in atmospheric pressure will result in a 1% change
in the reading. The XTP601 has barometric pressure
compensation fi tted as standard and is ranged specifi cally to
customer’s needs to off er the best accuracy where it matters.
For instance, in a 0–1% range the XTP601 is accurate to
±0.02% O
.
2
The closer the analyzer can be installed to the sample point,
the better, for many reasons. These include, faster overall
speed of response (for safety), less sample line or cabling
(saves cost) greater choice of installation points (fl exibility).
Also having a local display does not require two operators (or
walking back and forth to the control room) for maintenance
or diagnostics.
External sensor input
The unit has the facility to accept a 4–20 mA signal from
an external source such as dew-point sensor, pressure
transmitter, temperature probe, or user-defi ned sensor, and
display it on the screen. This saves the cost of buying and
installing an external display for another parameter that only
requires occasional visual inspection.
Higher sensor stability reduces calibration costs
The sensor in Michell’s XTP601 analyzer largely eliminates
thermistor drift associated with other comparable devices,
improving the stability of the measurement. This allows longer
calibration intervals and reduces both labor and consumable
costs.
Reliable long-term performance
In some installations, such as off shore or on board oil tankers,
the movement and vibrations present could aff ect the moving
parts of other kinds of sensors. The thermo-paramagnetic
sensor has no moving parts, making it ideal for these
applications.
Non-depleting technology
The sensor does not require routine replacement and is not
poisoned like electrochemical cells. This will save downtime
and maintenance costs. The cell performance is consistent and
does not drift as it is not consumed by the process.
The non-depleting sensor reduces service intervals and no
regular replacement of cells is required. The casing unscrews
to allow for easy access to the sensor, enabling maintenance
of the modular components to be carried out quickly and
effi ciently.
Easy installation with local display for use in hazardous
areas
The XTP601 provides two 4–20 mA outputs and is housed in a
robust and weather-proof casing, allowing the analyzer to be
placed at the point of measurement.
Chemical plant
Technology
Thermo-Paramagnetic Sensor
Oxygen is a paramagnetic gas, which means that it is
attracted by a magnetic fi eld. This magnetic susceptibility
is much greater for O
molecules and therefore this physical property is ideal for
the determination of the level of oxygen in a wide range of
background gases.
The XTP601 series is a thermo-paramagnetic oxygen
analyzer where the combination of paramagnetic and thermal
conductivity technology is exploited to accurately measure
oxygen. The instrument is very stable which gives the user
confi dence in the measurement. This is important in safety
applications such as blanketing of vessels or reactors in
chemical plants.
In addition to the stability of the Michell XTP601 sensor, the
insensitivity to mechanical shock is another advantage of
the thermo-paramagnetic technology. As it relies solely upon
fl uctuations in magnetic fi elds, and not internal moving parts,
the sensor will operate effi ciently under a wide range of
environmental conditions. It is suitable for installation where
vibration or movement could pose a problem for other sensor
types.
than that of most other gas
2
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Oxygen Analyzers
Flexible Packaging
The XTP601 is available in two confi gurations, both with the option of safe (GP) or hazardous (EX) area classifi cation depending
on the individual customer’s needs — this allows the user to determine the price to feature ratio that best suits each installation.
XTP601 (EX1, GP1 or GP2)
The full display model provides a
local HMI for the user to access
all the functions of the analyzer
through the glass via capacitance
buttons. As well as displaying the
oxygen concentration there is a
status bar showing messages.
The user can scroll through the
front screens to see a graph of
the latest period (user-defi ned),
high & low oxygen points,
reading from an external sensor
and alarm history.
XTP601 (EX3 or GP3)
The basic model is an oxygen
transmitter that provides 4–20
mA outputs, alarm relays & RS485
serial communications. There
is application software included
that allows the user to visualize
and interact with the unit from
their PC or control system. There
is an optional light guide that will
indicate when the unit is powered
up and/or in alarm condition.
Application Software
The XTP601 analyzer is supplied
with application software that will
allow the user remote access to
the unit. This includes displaying
the oxygen concentration, alarms,
graphs, changing parameters and
even remote calibration.
Dimensions
11.5 mm (0.45'')
172 mm (6.77'')
195 mm (7.68'')
12.0 mm (0.47'')
11.5 mm
(0.45'')
234mm (9.21'')
172 mm (6.77'')
171 mm (6.73'')
195 mm (7.68'')
9 mm (0.35'')
TY P
12.0 mm
(0.47'')
171 mm (6.73'')
50.5 MAX
172 mm (6.77'')
30 mm (1.18'')
49 mm (1.93'')
44.0 mm
70.0
REF
15.5 mm (0.61'')
(1.73'')
35 mm (1.38'') 35 mm (1.38'')
1/8" NPT
(SHOWN WITH FLAME ARRESTOR FITTED)
2 o
M20
3 o
PS601 Premium Sample Handling System for the XTP601
For a long, trouble-free life, oxygen analyzers invariably require a clean, dry gas that is free from particulates and at a suitable
temperature and pressure. In the real world, the process gas being measured almost never fulfi ls these requirements. Michell
Instruments off ers a complete solution for this problem: The XTP601 and PS601 Sample Handling System. This modular system
is constructed in consultation with customers to ensure the best possible solution for each individual application.
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Oxygen Analyzers
Technical Specifi cations
Performance
Measurement technology Thermo-paramagnetic oxygen sensor
Gas Process and non-condensing sample with
Measurement range Selectable from 0–0.5% up to 0-50% and
Display resolution 0.01% for suppressed zero ranges
Display type Backlit LCD
Accuracy (excluding
suppressed zero ranges)
Accuracy for suppressed
zero ranges (80/90–100%)
Response time (T90)
with high speed response
(HSR) enabled
Repeatability ±0.2% of span or 0.01% O
Linearity ±0.5% of span or 0.05% O
Zero stability ±0.25% of span per month
Span stability ±0.25% of span per month
Sample fl ow rate
Sample pressure 0 to 3 barg inlet with atmospheric vent
Sample temperature 5 to 55°C (+41 to +131°F) max
Sample cell temperature Standard +50°C (+122°F)
Background gas Analyzer is calibrated in the background
particles <3μm
20, 80 or 90–100%
<±1% of span or ±0.02% O
greater
<0.2% O
2
<15 seconds
greater
greater
GP1 and GP3: 100 to 500 ml/min (0.2 to
1.06 scfh)
EX1, EX3 and GP2: 270 to 330 ml/min (0.6
to 0.7 scfh)
(+45°C (+113°F) for standard cell)
(Optional +55°C and +60°C (+131°F and
+140°F) for ranges 0-0.5% up to 0-50%
only.)
gas of the process. Standard gases are: N2,
CO2, CH4, H2 & Biogas. Others available on
request.
whichever is
2
whichever is
2
whichever is
2
Electrical Specifi cations
Analog inputs 2 off 4–20 mA inputs
Analog outputs 2 off 4–20 mA outputs (powered with 24V
Output ranges Primary range is set to the calibrated range
Alarms 2 off single pole changeover (SPCO) relays
Datalogging The user can use the digital communications
Digital communications Modbus RTU over RS485 Protocol
Power supply 24 V DC; 1.5 A max
Cable entries Analyzer is supplied with 3 x M20 cable
One for an external sensor that can be
displayed on the screen
One to act as an active compensation for the
process conditions
excitation voltage)
of the instrument
The second is user selectable 0-100%
concentration (250 V, 5 A max)
for O
2
to log the output from the analyzer The unit
will store 40 alarm points and the min/max
concentrations with date and time stamp
O
2
entries. Cable glands, conduit entries and
blanking plugs are available as accessories.
Operating Conditions
Ambient temperature 5 to +55°C (+41 to +131°F)
Atmopheric pressure 750mbar to 1250mbar
Mechanical Specifi cations
Warm up time <25 minutes
Stabilization time 5 minutes
Dimensions 234 x 234 x 172mm (9.2 x 9.2 x 6.7”)
Weight 9.7kg (21.4lbs)
Wetted materials 316 & 430F stainless steel, boroscillicate
O-Ring materials Viton, Silicone or Ekraz
Gas connection EX1, EX3 & GP2: 1/8” NPT (female)
Ingress protection IP66, NEMA 4X
(w x d x h)
glass, platinum, 3M 2216 (plus o-ring)
GP1 and GP3: 1/4” NPT (female)
Hazardous Area Classifi cation
ATEX II 2GD Ex d IIB+H2 T6 Gb
IECEx Ex d IIB+H2 T6 Gb
CSA
C
us
INMETRO Ex d IIB+H2 T6 Gb
TC TR Ex 1 Ex d IIB+H2 T6 Gb
Temperature ranges for
ATEX and IECEx as per
o-ring type
The XTP601 process oxygen analyzer meets or exceeds all relevant
clauses in BS EN 50104 : 2010 “Electrical apparatus for the detection
and measurement of oxygen”.
Ex tb IIIC T85°C Db IP66
Ex tb IIIC T85°C Db IP66
Class I, Division 1, Groups B,C,D, T6
Ex tb IIIC T85°C Db IP66
Silicon: Ta = -40°C to +55°C
Viton: Ta = -15°C to +55°C
Ekraz: Ta = -10°C to +55°C
Michell Instruments, Rotronic Instrument Corp. 135 Engineers Road, Suite 150, Hauppauge NY 11788
Tel: 631 427 3898, Email: us.info@michell.com, Web:
Michell Instruments adopts a continuous development programme which sometimes necessitates specifi cation changes without notice.
Issue no: XTP601_97314_V6_US_0518
www.michell.com/us
© 2018 Michell Instruments
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