Servomex 1900 User manual

1900
Oxygen Analyser
Hazardous Area
™
Please record your analyser details below
Part Number
Serial Number
Tag Number

1900 Series
i

1900 Series
ii
20
235
227
159
63
60 6860
25844
387
448
50
118 44
174
10
407
168

1900 Series
iii
RELAY CONTACTS SHOWN
IN DE-ENERGISED POSITION
0-1V NON
ISOLATED
4-20mA
ISOLATED
F1.
F3.15A.
HBC.
OUTPUT
TB-3
(1)
N (2)
L (3)
RANGE
FLOW
ALARM
ALARM 2
ALARM 1
ALARMS
SUPPLY
ZERO
SPAN
12
11
10
9
8
7
6
5
4
3
2
1
TB-2 TB-4
1
2
3
4
+
-
+
-
TB-3
N
L
12
11
10
9
8
7
6
5
4
3
2
1
1
2
3
4
+
-
+
-

1900 Series
iv
Alarm Set
Span
Zero
Hi
Low
Hi
Low
2
Alarm
1
20.9 %O2
AlarmFlowPower
Range 1
Range 2
Range Set
100%
50%
25%
10%
5%
100%
50%
25%
10%
5%
LK4
RANGE 2
LK3
RANGE 1
NOT FITTED
FITTED
FLAL
LK5
LK1 LOW
HIGH
ALARM 1
LK2
ALARM 2
LOW
HIGH
LK6
FAI LURE MODE
LOW
HIGH

1900 Series
v

1900 Series
vi
Notes

xendos 1900 Series 1
1 INTRODUCTION
1.1 Warnings, Cautions and Notes
This manual includes WARNINGS, CAUTIONS and NOTES which provide information
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 analyser, xendos 1900 Series
• For latest technical specification refer to the Technical Data Sheet.
• Addresses for technical assistance and spares are given on the rear cover.
• A service manual is available for use by qualified personnel, part number
01800002B.
About this manual
Ref:01900/003B/3
Order as part 01900003B

xendos 1900 Series
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 7. Flow Failure LED
2. Set ZERO potentiometer 8. Alarm LED
3. Set SPAN potentiometer 9. Range change push button
4. Set ALARM push button 10. Range label (Slip In)
5. Alarm LEDs 11. Sample filter (Screws in through control panel)
6. Digital display (0.0 to 100.0% O2) 12. Range LEDs
optional (0.00 to 100.00% O2)
Figure D Link settings on housekeeping board
1. Flow alarm (LK5) 4. Failure Mode (LK6)
2. Range 1 (LK3) 5. Alarm 2 (LK2)
3. Range 2 (LK4) 6. Alarm 1 (LK1)
EC Directive Compliance
The xendos 1900 complies with the EMC Directive 89/336/EEC (as
amended by Directives 92/31/EEC and 93/68/EEC) and the ATEX
Directive 94/9/EC.

xendos 1900 Series 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 Series
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 Series analysers are available with the following
hazardous area approvals:-
FM Class I, II & III, Division 1
(USA) Groups A, B, C, D, E, F & G
T4, Ambient Temp. 50/C maximum
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 T4X
(Japan)
ATEX Ex II 2G.
(Europe) EEx iad IIC T4
(-20°C < Ta < 50°C)
• The xendos 1900 Series 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
ATEX 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.
• Personal injury or equipment damage may occur if the
xendos 1900 is not installed and operated in accordance with
the instructions in this manual.

xendos 1900 Series 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 securely to 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 must be mounted horizontally with the sample connections and 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 Series
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 mains supply, relay contact outputs and/or 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.

xendos 1900 Series 7
4 Electrical power should be supplied at 100 V to 240 Vac ± 10% - 50 / 60 Hz. No
voltage range selection is required. A power on LED is illuminated when power
is present at the analyser.
5 For compliance with the EMC standards, the external earth / ground connection
must always be connected to a local earth / ground. Refer to Figure (A). In
addition, the connections to TB2, TB3 and TB4 must always be made using 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 bar if needed. The lid thread is pre-greased and no additional non-
setting sealant, etc is 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.
WARNING
If the relay connections to TB2 are used to switch a combination of
240V ac and 28V dc signals, then all parts of the dc relay circuits
must be protected to a minimum of IP20

xendos 1900 Series
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 Series 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.
xendos 1900 Sample Condition Requirements
Sample Viton/SS with AFCD High-flow cell
or bypass
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 50 to 70l/hr
(60l/hr nom.)
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 and free from oil and condensate*
Connection 1/4" NPT Female Inlet / Outlet Connectors
† - Adjust sample pressure and flow externally to provide sample flow rate
* - For corrosive samples use a solvent resistant cell option
AFCD - Automatic Flow Control Device c/w internal filter

xendos 1900 Series
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.
• If an external sample pump is used it may be necessary to reduce pressure
pulsing with a reservoir.
• The sample exhaust from the analyser should be vented freely to 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.
The enclosure purge inlet and outlet connection sizes and location are shown in 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 Series 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
LK 2 Alarm 2 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 (depending on the link
setting selected) will go to either 0mA (default) or >20mA to indicate that this fault is
present. *Note: Transducer failure will produce a ‘Low on Fault’ condition.
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. Set the links on the housekeeping board to the required position with reference to
Figure (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 LED indicator on the front panel will show whether Range
1 or Range 2 has been selected, see Figure (C).

xendos 1900 Series
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 LED 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 LED indicator for the other alarm will now
illuminate. Adjust the alarm setpoint displayed to the desired level.
The LED 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 Series 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
clean dry instrument air (nominally 20.95% oxygen).
Once the reading has stabilised, adjust the span control so that the display reads
20.9 % oxygen* or the actual level of oxygen in the calibration gas cylinder.
* with the optional 4.5 digit display board, zero can be set to 0.00 % and span to 20.95 %.
The calibration should be checked either weekly, monthly or 3 monthly depending on
application.