Servomex 1900 User manual

1900
Oxygen Analyser
Hazardous Area
™
Please record your analyser details below
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xendos 1900/1902 1
1 INTRODUCTION
1.1 Warnings, Cautions and Notes
ThismanualincludesWARNINGS,CAUTIONSandNOTESwhichprovideinformation
relating to the following:
WARNINGS
Hazards which could result in personal injury or death.
CAUTIONS
Hazards which could result in equipment or property damage.
NOTES
Alert the user to pertinent facts and conditions.
1.2 Scope of this manual
This manual covers installation, normal operation and routine maintenance of the
Servomex paramagnetic oxygen analysers, xendos 1900 / 1902 / 1900EUR / 1902EUR
• For latest technical specification refer to the Technical Data Sheet.
• References to the xendos 1900 / 1900EUR also include the xendos 1902 /
1902EUR unless stated otherwise.
• Addresses for technical assistance and spares are given on the rear cover.
• A service manual is available for use by qualified personnel, part number
01800002A.
About this manual
Ref:01900/003A/4
Order as part 01900003A

xendos 1900/1902
2
KEY TO FIGURES
Figure A Mounting details
1. M6 bolt (4 off) 5mm allen key 7. Purge outlet (if used)
2. LH cover (hinged) 8. Sample outlet
3. Display window 9. Sample inlet
4. RH cover 10. Cable entries (3 off)
5. M8 mounting slot (4 off) 11. M6 earth stud
6. Purge inlet (if used) 12. Breather
(Sample , Purge Inlet / Outlet and Breather Port - ¼”NPT.INT)
Figure B Electrical connections
1. Range contacts 7. Electrical supply terminals
2. Flow Fail alarm contacts 8. Output cable entry
3. Alarm 2 contacts 9. Supply cable entry
4. Alarm 1 contacts 10. Alarm cable entry
5. Linear non isolated Output signals (Cable entries - ¾”NPT, M20 or Pg13.5)
6. Linear isolated Output signals 11. Power Supply Fuse (F1) - F3.15A HBC
Figure C Control panel (hinged)
1. Power On LED (green) 7. Flow Failure LED (red)
2. Set ZERO potentiometer 8. Alarm LED (red)
3. Set SPAN potentiometer 9. Range change push button
4. Set ALARM push button 10. Range label (Slip In)
5.AlarmLEDs(yellow) 11.Samplefilter(Screwsin through control panel)
6. Digital display (0.0 to 100.0% O2) 12. Range LEDs (yellow)
Figure D Link settings on 1800/901 and 1800/911 boards
1. Flow alarm (LK5) 4. Failure Mode (LK6)
2. Range 1 (LK3) 5. Alarm 2 (LK2)
3. Range 2 (LK4) 6. Alarm 1 (LK1)
CE Marking
The xendos 1900 / 1902 / 1900EUR / 1902EUR analysers carry the
CE mark which indicates conformity with the European Community
Directives on CE Marking (93/68/EEC), Electromagnetic Compatibility
(EMC 89/336/EEC) and Low Voltage Directive (LVD 73/23/EEC).

xendos 1900/1902 3
1.3 Unpacking
WARNING
The xendos 1900 weighs approximately 26kg (57lbs) and care must
be taken when handling. It is recommended that it is lifted with the
fingers positioned underneath the rear casting.
• Remove the xendos 1900 from its packing and inspect it for damage.
• If damage has occurred, inform Servomex or its agent immediately.
• Retain all packing and shipping information for future use.
2. INSTALLATION
WARNING
•Refer to Conditions for Safe Use before installation.
•The Terminal chamber on the right hand side of the analyser
should not be opened while energised or within 3 minutes
following removal of power.
•Refer servicing to qualified personnel with knowledge of
hazardous area requirements.

xendos 1900/1902
4
2.1 Conditions for Safe Use
WARNINGS
Take careful note of the following warning statements
• The installation of the analyser in a hazardous area must
comply with any ‘Special conditions for safe use’ and/or
‘Schedules of Limitations’ as detailed in the safety
certification.
• The xendos 1900 / 1902 analysers are available with the
following hazardous area approvals:-
xendos 1900 / 1902
FM Class I, II & III, Division 1
(USA) Groups A, B, C, D, E, F & G
CSA Class I , Division 1, Groups A, B, C & D
(Canada) Class II, Division 1, Groups E, F & G
Class III, Division 1
Ex ia T4, T.ambient 50/C maximum
TIIS Ex ia d IIC T4
(Japan)
xendos 1900EUR / 1902EUR
CENELEC EEx ia d IIC T4
(Europe) T.ambient 50/C maximum
• The xendos 1900 / 1902 analysers are not suitable for use
with Oxygen enriched atmospheres
• When used in hazardous atmospheres, at least one of the
alarms must be configured as a HIGH alarm and be set at
not more than 22% Oxygen
CENELEC Requirement
• The EEx d compartment of the enclosure is provided with
three 3/4" NPT cable entry holes for the accomodation of
suitable BASEEFA certified flameproof cable entry devices,
with or without the interposition of a suitable BASEEFA
certified flameproof thread adaptor. The cabling methods
used in service must be closed by means of a suitable
BASEEFA certified flameproof stopping plug.

xendos 1900/1902 5
2.2 Location
Select a location which allows convenient access for installation and maintenance and will
minimise ambient temperature fluctuations and vibration.
The analyser must be mounted securelyto a rigid vertical surface capable of supporting the
weight of the analyser, using the four fixing lugs provided or the panel mounting option.
The xendos 1900 mustbe mounted horizontallywith the sampleconnectionsand electrical
entries on the underside.
The sample conditioning system where required should be located below the analyser to
prevent possible carry-over of condensate into the measuring cell and please take careful
note of the ambient temperature requirements.
The xendos 1900 is rated in accordance with IEC 644 for:
'INSTALLATION CATEGORY II' Local level power distribution with over
voltage withstand up to 2500 Volts.
Ambient Operating Conditions:
Operating Temperature: -10/C to +50/C(+14/F to +122/F)
Storage Temperature: -20/C to +55/C (- 4/F to +131/F)
Atmospheric pressure: 79 to 124 kPaa (11 to 18 psia)
(for operating altitudes to 2000m)
2.3 Panel Mounting
A panel mounting option is available, please consult Servomex for further details.

xendos 1900/1902
6
2.4 Electrical installation
WARNINGS
• The installer must be satisfied that the xendos 1900
installation conforms to the relevant safety requirements,
National Electrical Code and any other local regulations, and
that the installation is safe for any extremes of conditions
which may be experienced in the operating environment of
the analyser.
• This appliance must be connected to a protective earth.
• The electrical installation must include a means of isolating
electrical power by a switch or circuit breaker external to the
analyser and within easy reach of the operator. It must be
marked as the disconnecting device for the equipment.
• It is essential that only suitably trained and competent
personnel are allowed to access hazardous lives parts by
removing or opening the covers of the analyser.
• To comply with the European Community EMC Directives for
industrial environments the interconnecting cables used for
the relay contact outputs and/or the analogue output signals
should be screened or provide equivalent protection.
CAUTION
Connections to TB-4, analogue output signal/s terminals should not
exceed 30 V RMS (42.4 V peak) or 60 V dc to earth when connected to
associated equipment.
1 Electrical terminations are suitable for 20 AWG (0.5 mm2) to 14 AWG
(2.5 mm2) solid conductors or stranded conductors.
2 Gland entry sizes and positions are shown in Figure (A). Two of the three cable
entries are fitted with appropriate blanking plugs.
3 Do not exceed the maximum current output load impedance of 600 Ohms.
4 Electrical power should be supplied at 100 V to 240 Vac ± 10% - 50 / 60 Hz. No
voltage range selection is required. A green power on LED is illuminated when
power is present at the analyser.

xendos 1900/1902 7
5 For compliance with the EMC standards, theexternal earth / ground connection
must always be connected to a local earth / ground. Refer to Figure (A). In
addition, the connections toTB2 andTB4mustalwaysbe madeusing a screened
or shielded cable with the earth termination being made at the cable gland.
Ensure good EMC practices are observed when making connections.
6 All electrical connections are made to the terminal board inside the right hand
side of the analyser. Refer to Figure (B) for details and full specifications are
given in the following table. To gain access refer to Figure (A). Slacken off the
M4 lid locking grub screw with a 2mm allen key, and unscrew the lid with the
aid of a metal barif needed. The lidthreadis pre-greased and no additional non-
setting sealant, etcis required . After electrical connections are complete, ensure
the threads are correctly aligned, screw the lid fully down and re-tighten the lid
locking grub screw.

xendos 1900/1902
8
Power Connection Terminals
Electrical Power,
100V to 240Vac ± 10%,
50 / 60 Hz, 50VA maximum
Protective Earth
Neutral
Live
TB3-1
TB3-2
TB3-3
Alarm Connection Terminals
Alarm 1
250Vac, 3A
28Vdc, 1A
Closes on Alarm 1 or Power Fail
Opens on Alarm 1 or Power Fail
Common
TB2-1
TB2-2
TB2-3
Alarm 2
250Vac, 3A
28Vdc, 1A
Closes on Alarm 2 or Power Fail
Opens on Alarm 2 or Power Fail
Common
TB2-4
TB2-5
TB2-6
Flow Fail Alarm
250Vac, 3A
28Vdc, 1A
Closes on Flow Fail Alarm or Power Fail
Opens on Flow Fail Alarm or Power Fail
Common
TB2-7
TB2-8
TB2-9
Range Selected Output Connection Terminals
Range 2 selected
250Vac, 3A
28Vdc, 1A
Closes on Range 2 or Power Fail
Opens on Range 2 or Power Fail
Common
TB2-10
TB2-11
TB2-12
Linear Analogue Output Signal Connection Terminals
0 to 1Vdc Oxygen output signal,
(non isolated), output impedance 470 Ohms typical + ve - ve TB4-1 TB4-2
4 to 20mA Oxygen output signal,
(isolated), maximum load impedance 600 Ohms + ve - ve TB4-3 TB4-4
The full scale of the above outputs represents the range selected by the push button
Range switch on the front panel.

xendos 1900/1902 9
2.5 Sample and Calibration gas connection
CAUTION
•The sample gas must not be admitted to the analyser until a
period of 4 hours has been allowed for warm up, this will
prevent condensation of the sample in the measuring cell.
•The inlet pressure and flow rate for the sample or calibration
gas must not exceed the limits specified in the following table
or damage could occur. Use an external pressure reducing
device if necessary.
•When pressurising the sample system for the purpose of leak
testing ensure that pressure is increased and decreased
slowly. High internal flow rates created when the pressure is
changed rapidly will damage the measuring cell.
Sample Condition Requirements
Configuration
------------------
Sample
Base Analyser
Viton/SS xendos 1900/1900EUR
with AFCD
Base Analyser
Bypass/SS or
Hast/PFA
Inlet Pressure 0.04 psig †
0.3kPag min 1 to 5 psig 7 to 35 kPag min 0.05 psig † 0.4 kPag min
Flow Rate 50 to 250 ml/min 1.2 to 3.5 l/min 60 l/hour
Vent Pressure 11.5 to 18 psia (80.5 to 126 kPaa)
Dew Point Non-condensing at ambient temperature
Temperature -10/C to +50/C (+14/F to +122/F)
Particulates < 3µm (micron)
Condition Clean, non-corrosive * and free from oil / condensate
Connections ¼” NPT Female Inlet / Outlet Connectors
† - Adjust sample pressure and flow rate externally to provide sample flow rate
* - For Corrosive samples use the xendos 1902 / 1902EUR
AFCD - Automatic Flow Control Device c/w internal sample filter

xendos 1900/1902
10
• If the automatic flow control device option is fitted no external flow control is
necessary, the sample pressure must be between the limits specified in the
previous table and/or the latest Technical Data Sheet.
• If the optional automatic flow control device is not fitted it will be necessary to
regulate the sample pressure / flow within the limits specified in the previous
table to ensure stable operation and to prevent damage to the measuring cell.
• Ifanexternalsamplepumpisuseditmaybenecessarytoreducepressurepulsing
with a reservoir.
• Thesampleexhaustfromthe analysershouldbeventedfreelyto atmosphere.See
WARNING below for safety details.
WARNING
•Verify that connections are leak free at full operating pressure
before applying sample or calibration gases. These gases
may be toxic or asphyxiant.
•Consideration should be given to the toxicity, corrosiveness,
asphyxiant and flammable nature of the sample and
enclosure purging gas when selecting a vent location.
2.6 Enclosure purge connection
WARNING
If the sample gas is of a toxic, corrosive and/or flammable nature it is
recommended that an enclosure purge option is fitted. If fitted the
enclosure purge must be operational before removing any covers.
Theenclosure purgeinlet and outlet connection sizesand locationareshownin Figure(A).
Supply air or inert gas at 100 to 200 ml/minute. Vent the outlet freely to atmosphere.
2.7 Shut down procedure
Before removing power from the analyser disconnect the sample gas and flush the analyser
sample pipework with dry nitrogen or good quality instrument air for 10 minutes.

xendos 1900/1902 11
3 SETTING UP
3.1 Configuration
WARNING
To maintain the ingress protection (IP20) required by hazardous area
approval requirements the user must not open the internal hinged control
panel to make changes to the configuration with the power on to the
analyser.
The analyser is supplied configured as follows:
Link Parameter Setting Link Parameter Setting
LK 1 Alarm 1 Low = 0.0% O2LK 4 Range 2 0 - 25% O2
LK2 Alarm2 High= 21.0% O2LK 5 Flow Alarm "Fitted" if option included
LK 3 Range 1 0 - 10% O2LK 6 Failure Mode*Low on Fault
* Failure Mode - If the sample flow fail alarm option is fitted and a low sample flow
condition is detected then the isolated 4-20mA output signal (dependingon the link setting
selected) will go to either 0mA (default) or >20mA to indicate that this fault is present.
To change the above configuration:
1. Switch off the analyser.
2. Open the hinged front left cover by undoing the four M6 bolts using a 5mm allen
key.
3. Open the hinged control panel with the screw situated in the middle of the right
hand side.
4. Setthelinksonthe1800/911boardto therequiredpositionwithreferencetoFigure
(D). The links should be removed and replaced using a pair of snipe nose pliers.
5. Spare range labels are provided with the analyser that slip into the side of the front
panel to indicate the new ranges selected.
6. Switch on the analyser, a yellow LED indicator on the front panel will show
whether Range 1 or Range 2 has been selected, see Figure (C).

xendos 1900/1902
12
3.2 Alarm Set Point Adjustment
WARNING
When used in hazardous atmospheres, at least one of the alarms must be
configured as a HIGH alarm and be set at not more than 22% Oxygen.
The alarm setpoint range is equal to the full scale range of the analyser and its digital
display (0-100% O2). The alarm level is set as an Oxygen concentration value. It is
independent of the scaling selected for the analogue outputs. Changing the ranges of the
output signals with the Range Change push button switch on the front panel does not
effect the alarm setpoints. Adjusting the alarm setpoint does not effect the current or
voltage output signals.
1. Open the hinged front left cover by undoing the four M6 bolts using a 5mm allen
key.
2. Press the 'Alarm set' button; one of the yellow indicators will be illuminated. The
setpoint for this alarm will be shown on the display. Adjust the alarm setpoint
control adjacent to the illuminated indicator to achieve the desired alarm setpoint.
3. Press the 'Alarm set' button again, a yellow indicator for the other alarm will now
illuminate. Adjust the alarm setpoint displayed to the desired level.
The yellow indicators also indicate whether the alarm is configured to be a High or Low
alarm and will flash if an alarm is present. Refer Figure (C).

xendos 1900/1902 13
4. CALIBRATION
4.1 Zero and Span adjustment
CAUTION
The pressure and flow rates of the zero and span gases used to
calibrate the xendos analysers must not exceed the values detailed in
Section 2.5 Sample Gas Connection.
The analyser should have been running for at least four hours before carrying out
calibration. It is recommended that the sample outlet from the xendos analyser be vented
directly to atmosphere.
The zero and span calibration gas can be introduced into the analyser via a 3 way valve
fitted into the sample inlet pipework or directly into the analyser sample inlet by
disconnecting the sample pipework and isolating the sample flow elsewhere.
1. Open the hinged front left cover using a 5mm allen key.
2. To set the zero, introduce zero calibration gas, this should be high purity nitrogen
(99.9% min). Once the reading has stabilised, adjust the zero control so that the
display reads 0.0 % oxygen.
3. To set the span, introduce span calibration gas, normally this can be good quality
cleandryinstrumentair(nominally20.9%oxygen).Oncethereadinghasstabilised,
adjust the span control so that the display reads 20.9 % oxygen or the actual level
of oxygen in the calibration gas cylinder.
The calibration should be checked either weekly, monthly or 3 monthly depending on
application.

xendos 1900/1902
14
4.2 Zero and Span adjustment of the
Isolated 4-20mA analogue output signal
Located in the top left hand corner of the terminal compartment of the enclosure are two
potentiometers for the Zero and Span adjustment of the isolated current output signal.
1. Connect a current meter with the range set to 0 to 100mA between Pin 3 (+ve) of
TB4 and Pin 4 (-ve) of TB4.
2. Connect a voltagemeter with the range set to 0 to 2Vdc between Pin 1 (+ve) of TB4
and Pin 2 (-ve) of TB4.
3. Set the output measurement range to 0 to 25% O2.
4. Apply Nitrogen to the inlet of the analyser at the correct pressure and flow rate.
When the analyser reading has stabilised adjust the Zero potentiometer on the
analyser front panel so that the voltage output reads 0.000Vdc.
5. Then adjust the 4-20mA Zero potentiometer located in the terminal compartment
to give an output current of 4.00mA. Then apply high quality clean instrument air
(ie 20.95% O2) to the inlet of the analyser at the correct pressure and flow rate.
6. When the analyser reading has stabilised adjust the Span potentiometer on the
analyser front panel so that the voltage output reads 0.838Vdc.
7. Then adjust the 4-20mA Span potentiometer located in the terminal compartment
to give an output current of 17.41mA.

xendos 1900/1902 15
5 ROUTINE MAINTENANCE
If the automatic flow control option is fitted, replace the filter element, located protruding
through the front panel, Reference Figure C at 3 month intervals. This period may be
extended for clean samples. The analyser must be isolated from the sample or calibration
gas whilethe filter element is beingchanged. The filter element isremoved byunscrewing
the large filter cap on the front panel. The old element must be disposed of safely. If the
element is wet or verydirty checkthat the sample conditioning is adequate. Once the filter
cap is replaced the filter seal should be checked for leaks. The analyser must not be
operated without the filter element in place as dust and other particulates maypermanently
damage the measuring cell.
6 SPARES
WARNING
xendos 1900 / 1902 spares must be supplied by Servomex to comply with
hazardous area approvals.
The following spares are required to maintain normal operation of the analyser.
Part
Number Description - xendos 1900 Description - xendos 1900EUR Quantity
S1800985 AFCD filter element kit (10 off) 1 pkt.
S1800986 Enclosure seals kit (1 set) 1 pkt.
S1800987 Fuse kit (F3.15A HBC) (10 off) 1 pkt.
Part
Number Description - xendos 1902 Description - xendos 1902EUR Quantity
S1800986 Enclosure seals kit (10 off) 1 pkt.
S1800987 Fuse kit (F3.15A HBC) (10 off) 1 pkt.

xendos 1900/1902
16
The following spares are required for comprehensive servicing of the analyser.
Part
Number Description - xendos 1900 Quantity
S1800422 Transducer Sample Inlet Tube (SS316) 1 off
S1800423 Transducer Sample Outlet Tube (SS316) 1 off
S1800911 Housekeeping pcb complete 1 off
S1800902 Display pcb complete 1 off
S1800913 Terminals pcb complete 1 off
S1900995 IS Protection Block Module 1 off
S1800980 Sample Flow Alarm (xendos 1900) 1 off
S1800989 xendos 1900 Paramagnetic O2Transducer Assy. 1 off
00570915 AFCD for analysers without optional flow alarm 1 off
S1420935 AFCD for analysers fitted with optional flow alarm 1 off
2822-2028 Switch mode power supply module 1 off
3950-6087 Anti-static glass window 1 off
Part
Number Description - xendos 1902 Quantity
S1800436 Transducer Sample Inlet Tube (Hastelloy C-276) 1 off
S1800437 Transducer Sample Outlet Tube (Hastelloy C-276) 1 off
S1800911 Housekeeping pcb complete 1 off
S1800902 Display pcb complete 1 off
S1800913 Terminals pcb complete 1 off
S1900995 IS Protection Block Module 1 off
S1902989 xendos 1902 Paramagnetic O2Transducer Assy. 1 off
2822-2028 Switch mode power supply module 1 off
3950-6087 Anti-static glass window 1 off
TECHNICAL SPECIFICATION - xendos 1900 / 1902

xendos 1900/1902 17
7.1 Analyser Performance
Performance
Measurement Units
Base
Analyser
Viton/SS
xendos
1900/
1900EUR
AFCD
Base
Analyser
Bypass/SS
or
Hast/PFA
Intrinsic Error
(accuracy) % Span of selected
output range < 1 < 1 < 1
Linearity Error % Span of selected
output range < 0.1 < 0.1 < 0.1
Repeatability % Span of selected
output range < 0.1 < 0.1 < 0.1
Noise (peak to peak) % Span of selected
output range < 0.1 < 0.15 < 0.2
Zero Drift / 3 months % O2< 0.05 < 0.05 < 0.05
Span Drift / 3 months < 1 % of Span or 500 vpm O2whichever is the greater
Response Time (T90)Seconds < 4 < 7 < 5
60 l/hour
Ambient Temperature
Coefficient % O2/ 10/C < 0.2 < 0.2 < 0.2
Ambient Pressure Coefficient 1 % of reading for a 1% change in ambient pressure
Sample Flow
Rate Effect % O2< 0.1 over
50 to 250
ml / min
N/A < 0.1 over
6 to 60
litres / hour
The performance specification has been written, and verified, in accordance with the
international standard IEC 1207 - 1:1994 “Expression of performance of gas analysers”.

xendos 1900/1902
18
Measurement Range: 0 - 25% of Oxygen (O2)
Analogue Output ranges:
Two user configurable analogue output ranges selectable from:-
0 - 2.5%, 5%, 10% and 25% O2
Analyser Outputs:
Digital display - 3.5 digit backlit LCD (0.0 to 25.0% O2)
Display resolution - 0.1% O2
Current output - 4-20mA, isolated, maximum 600 Ohms
< 22mA maximum
Voltage output - 0-1Vdc, non-isolated,
output impedance 470 Ohms typical
Range indication - Volt free relay outputs and yellow LED
Alarms:
WARNING
When used in hazardous atmospheres, at least one of the alarms must be
configured as a HIGH alarm and be set at not more than 22% Oxygen.
Concentration alarms - Two volt free relay outputs and red LED
User configurable as High or Low
Set point field adjustable over range 0-22% O2
Concentration
alarm hysteresis - 0.2 to 0.3% O2
Sample flow fail alarm - Volt free relay output and red LED
Alarm relay
contact rating - 250V a.c / 3A or 28V d.c / 1A (non-inductive)
maximum and 5V / 10mA a.c/d.c minimum
Physical:
Size - 448mm W x 235mm H x 229mm D
(17¾” W x 9¼” H x 9" D approx.)
Weight - 26kg (57lbs)
Power Supply - 100 to 240Vac ±10%, 50/60Hz, 50VA
maximum