Servomex 2700 User manual

Part Number: 02700005B
Revision: 3
Language: UK English
Installation Manual
SERVOTOUGH Fluegas
(2700)
Combustion Gas Analyser
COMBUSTION ANALYSERS

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TABLE OF CONTENTS
Servomex 2700 Installation Manual
i
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.1 Warnings, Cautions and Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Scope of this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.3 General safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.4 Hazardous Area approval and certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
1.5 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
2 SERVOMEX 2700 OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2.2 Sensor head description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2.3 Control unit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3 INSTALLATION OF SENSOR HEAD AND PROBE TUBE. . . . . . . . . . . . . . . . . . . . . .9
3.1 Installation location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3.2 Flange mounting arrangements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.1 Standard installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3.2.2 Weld-on flange installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.3 Adaptor flange installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2.4 High temperature stand-off installation . . . . . . . . . . . . . . . . . . . . . . .15
3.2.5 Thermal spacer installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
3.2.6 Probe retention flange installation . . . . . . . . . . . . . . . . . . . . . . . . . .19
3.3 Sample probe installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
3.3.1 Open-ended and unsupported filtered metal
probe installation21
3.3.2 Open-ended ceramic probe installation . . . . . . . . . . . . . . . . . . . . . .21
3.3.3 Supported probe installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
3.4 Calibration and utilities supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
3.5 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
4 INSTALLATION OF CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
4.1 Installation location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
4.2 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
4.3 Enclosure purge connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
5 INITIAL STARTUP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
5.1 Gases required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
5.2 Visual inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
5.3 Initial power up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
5.4 Analogue output span setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
5.5 Sensor head sample flow adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
5.6 Combustibles sensor zero adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
5.7 Sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
6 MAINTENANCE AND SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
Appendix A INTERCONNECTING WIRING SCHEDULES. . . . . . . . . . . . . . . . . . . . . .49

Servomex 2700 Installation Manual
ii
LIST OF FIGURES
Figure 1 Servomex 2700 sensor head and control unit overview . . . . . . . . . . . . . . .7
Figure 2 Servomex 2700 sensor head dimensions (typical) . . . . . . . . . . . . . . . . . .11
Figure 3 Adaptor flange installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Figure 4 High temperature stand-off flange installation . . . . . . . . . . . . . . . . . . . . . .16
Figure 5 Thermal spacer installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Figure 6 Probe retention flange installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Figure 7 Sample probe and filter construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Figure 8 Supported probe construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Figure 9 Probe support tube installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Figure 10 Sensor head terminal enclosure detail. . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Figure 11 Control unit installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
Figure 12 Control unit enclosure detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Figure 13 Oxygen sensor only interconnection wiring schematic . . . . . . . . . . . . . . .50
Figure 14 Combustibles only interconnection wiring schematic . . . . . . . . . . . . . . . .52
Figure 15 Dual sensor interconnection wiring schematic . . . . . . . . . . . . . . . . . . . . .54
LIST OF TABLES
Table 1 Sensor head operating environment . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2 Sensor head adaptor flange kits. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 3 Sample probe part numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 4 Sensor head electrical power connections. . . . . . . . . . . . . . . . . . . 30
Table 5 Control unit operating environment . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 6 Control unit electrical power voltage selection . . . . . . . . . . . . . . . . 37
Table 7 Control unit electrical power connections. . . . . . . . . . . . . . . . . . . . 40
Table 8 Relay output connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Table 9 Analogue output connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 10 User remote dry contact inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Table 11 Utility gas sample requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Table 12 Interconnecting cable requirements . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 13 Oxygen sensor only interconnecting wiring . . . . . . . . . . . . . . . . . . 51
Table 14 Combustibles only interconnecting wiring . . . . . . . . . . . . . . . . . . . 53
Table 15 Dual sensor interconnecting wiring . . . . . . . . . . . . . . . . . . . . . . . . 55

Servomex 2700 Installation Manual
1
1 INTRODUCTION
1.1 Warnings, Cautions and Notes
This manual includes WARNINGS, CAUTIONS and NOTES which provide
information relating to the following:
1.2 Scope of this manual
This manual covers the installation of the Servomex 2700 Combustion Gas Analyser
and the various options that are available.
• Refer to the QuickStart Manual or Technical Data Sheet for latest technical
specification.
• Addresses for technical assistance and spares are given on the rear cover.
• A QuickStart Manual is available, part number 02700003B.
• A Service Manual is available for use by qualified personnel, part number
02700002B.
WARNINGS
Hazards which could result in personal injury or death
CAUTIONS
Hazards which could result in damage to equipment or property
NOTES
Alert the user to pertinent facts and conditions
CAUTION – refer to the Installation Manual
About this manual
Reference: 02700/005B/3
Order as part number: 02700005B

Servomex 2700 Installation Manual
2
CE Marking
The Servomex 2700 analyser carries 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).
Servomex 2700 control units are marked in conformity with the Explosive
Atmospheres (ATEX) Directive (94/9/EC) when fitted with a European hazardous
area certification marking plate.

Servomex 2700 Installation Manual
3
1.3 General safety information
Specific standards of safety are not included in this manual, since requirements of
relevant authorities vary widely. The safety precautions described in the following
installation instructions ensure that the existing safety features are not impaired
during installation. The precautions do not guarantee a safe installation if other
relevant safety codes are ignored.
WARNING
• The electrical power used in this equipment is at a voltage high enough to
endanger life.
• It is essential that only suitably trained and competent personnel are allowed
to access hazardous live parts by removing or opening covers of the
analyser.
• The sensor head is heated and may be attached to a hot flue. The external
surfaces will be uncomfortably hot even after power down for several hours.
Exercise care when handling the sensor head even when un-powered on a
hot flue.
• The installer must be satisfied that the Servomex 2700 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.
• To comply with the European Community EMC Directives for industrial
environments the interconnecting cables, mains supply, relay contact outputs
and/or analogue output signals should be screened or provide equivalent
protection.
• The Servomex 2700 sensor head aspirator supply is suitable for use with
compressed air only. Flammable gases must not be used for the aspirator
supply.
• The Servomex 2700 sensor head is not suitable for use in hazardous areas /
locations without the use of appropriate safety purge equipment.
• Servomex 2700 EU2/UK2/FM2/CS2 approved control units must be used if
the installation is in a Category 3/Zone 2/Division 2 hazardous area/location.
• Flanges and flange adaptors supplied by Servomex DO NOT conform to
ANSI or any other Standards body and must only be used in Servomex
specified applications with process pressure not greater than 5psig.

Servomex 2700 Installation Manual
4
1.4 Hazardous Area approval and certification
Copies of all hazardous area certificates are provided in the Certificate Manual
(part number 02700008B) which is supplied with each hazardous area certified unit.
In summary, the Servomex 2710 control unit is certified for use in Category 3/Zone 2/
Division 2 areas (for both gas and dust hazards) and is available with the following
hazardous area approvals:
Europe
The control unit may be supplied as either:
Approved as Type N to BS 6941: 1998 for Zone 2 Group IIC T5 hazardous location.
or
Approved as EEx nC IIC T5 (-20°C<Ta<+55°C) for ATEX Group II, Category 3,
Gas and Dust hazardous atmospheres, T75C, BAS02ATEX3205. In addition the
serial number and year of manufacture are marked on an external rating plate.
United States
Factory Mutual approved as non-incendive for:
Class I, Div. 2, Groups A,B,C & D.
Class II, Div. 2, Groups F & G.
Class III, Div. 1 & 2.
Enclosure Type 4X.
T5. Ambient Temperature 55°C max.
Canada
CSA: suitable for use in:
Class I, Div. 2, Groups A,B,C & D.
Class II, Div. 1, Groups E,F & G.
Class III, Div. 1.
T5. Ambient Temperature 55°C max.
Enclosure Type 4X.
NOTE
The branch circuit supplying power to this instrument should be installed with a
suitable fuse rated not greater than 15A or a suitable over-current protection device
set not greater than 15A.

Servomex 2700 Installation Manual
5
1.5 Unpacking
• Remove the Servomex 2700 components from their packing and inspect for
obvious external damage.
• If damage has occurred, inform Servomex or its agent immediately.
Retain all packing and shipping information for future use.
WARNING
The Servomex 2700 sensor head and control unit weigh approximately 17Kg
(38lbs) and 10Kg (22lbs) respectively and care must be taken when handling.

Servomex 2700 Installation Manual
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Servomex 2700 Installation Manual
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2 SERVOMEX 2700 OVERVIEW
2.1 Overview
Figure 1 Servomex 2700 sensor head and control unit overview
Key to Figure 1 – Servomex 2700 sensor head and control unit
overview
1 Terminal enclosure cover 6 Sample probe
2 Sensor head cover 7 Sample probe filter
3 4" mounting flange 8 Control unit
4 4" weld-on flange 9 Wall mounting brackets
5 Flue/process wall 10 Keypad and display
7
6
3
2
1
8
9
10
Control Unit
Sensor Head 45

Servomex 2700 Installation Manual
8
The Servomex 2700 Combustion Gas Analyser measures combustion and similar
gases to provide an analysis of the oxygen concentration and/or the level of unburned
combustibles. The analyser comprises two separate units which may be mounted up
to 300m (975ft) apart for oxygen only and 100m (325ft) apart whenever the
combustibles measurement option is fitted.
An overall system will consist of sensor head/sample probe/filter mounted directly
onto the flue wall and a control unit mounted remotely from the sensor head. The user
must ensure that both the sensor head and control unit have their own separate
power supply. Also required is a compressed air supply with a pressure regulator to
control the aspirator air supply.
An optional utilities unit is available to supply the sensor head with calibration gases
and compressed air.
2.2 Sensor head description
The sensor head is flange mounted on to the flue wall and houses the measurement
sensors in a heated enclosure. A probe tube projects through the duct wall into the
process gas to extract a gas sample for analysis. A comprehensive range of sample
probes and filters are available to enable the analyser to be used in a wide range of
applications and process conditions. Electrical connections are made to a terminal
box located on the side of the sensor head.
2.3 Control unit description
The control unit houses the drive electronics, microprocessor, keypad, display and
user wiring connections. The control unit may be either wall, surface or panel
mounted. Electrical connections are made via conduit entries located on the bottom
of the control unit enclosure.

Servomex 2700 Installation Manual
9
3 INSTALLATION OF SENSOR HEAD AND PROBE TUBE
3.1 Installation location
Refer to Figure 2.
Select a location which allows convenient access for installation and maintenance to
the terminal box enclosure. The sensor head is supplied with a 4" flange for direct
attachment to a flue wall. The sensor head must not be installed with the terminal box
oriented vertically above the heated sensor head body. All other mounting
orientations for the sensor head are acceptable. Operating environment conditions for
the sensor head are given in Table 1.
NOTE
All Servomex adaptor flanges, interface flanges, probe support tubes, stand-offs
and thermal spacers, including the integral flange on the sensor head, are suitable
for fitting onto the standard flanges (raised face [<1.6mm] or flat faced). But, they do
not comply with any national or international standards and the analyser’s
maximum process pressure is limited to 5psig.
CAUTIONS
• The sensor head must not be mounted with the terminal box vertically above
the sensor head body or with the mounting flange facing directly upwards, as
accuracy and service life may be reduced.
• Do not lift the sensor head by the compressed air pipe that is connected
between the solenoid valve and the bulkhead fitting.
• The anti-seize compound (part number 1761-3211) and ROCOL ASP dry
film anti-scuffing paste are the only recommended release compounds. The
use of "Silver Goop" or other similar release agents may result in permanent
damage to the combustibles sensor (if fitted).

Servomex 2700 Installation Manual
10
Table 1 – Sensor head operating environment
Item Specification
Ambient operating
temperature
-20°C to +70°C (-4°F to +158°F)
Storage temperature -30°C to +80°C (-22°F to +176°F)
Ingress protection IP66 and NEMA 4X
AC power supply
Factory set for either
a) 100-120Vac 50/60Hz
b) 220-240Vac 50/60Hz
a) 100-120Vac -15% +10%
(Min. 85V – Max. 132V)
b) 220-240Vac -15% +10%
(Min. 187V – Max. 264V)
Altitude Up to 2000m
Installation category Category II. Local level power distribution with
over-voltage withstand up to 2500V (in
accordance with IEC 664).
Pollution degree The sensor head/terminal box is rated Pollution
Degree 2 (in accordance with IEC 664 ).
The sample probe protruding into the flue and
the adjacent face of the flange is rated Pollution
Degree 4 (in accordance with IEC 664 ).
See Note 1
Relative humidity 0 to 80% RH
Note 1 : Where the installation is such that the enclosure ingress protection
IP66/Type 4X is maintained and the covers remain securely fitted, the apparatus
is suitable for use in locations where there may be significant deposits of
nonflammable dusts or fibres (Pollution Degree 4) and/or where there may be
drips, splashes of water, prolonged exposure to rain or subjected to hose down.
The covers may be removed during installation or servicing only if there is
negligible risk of pollution or contamination of the electronic circuits contained
within the enclosures and if the covers are securely replaced immediately after
the operation is completed. Refer to Section 6.

Servomex 2700 Installation Manual
11
Figure 2 Servomex 2700 sensor head dimensions (typical)
Key to Figure 2 – Servomex 2700 sensor head dimensions
1 Analyser mounting flange 4"
2 Sample vent port 1/8" NPT (INT)
3 Sample probe connection 1/2" NPT (INT)
4 Calibration gas inlet 1/4" OD compression fitting
5 Purge gas exit, 1/4" NPT (INT), or breather fitting
6 Combustion sensor auxiliary air supply 1/4" OD
compression fitting (optional)
7 Purge gas entry, 1/4" NPT (INT) or blanking plug
8 Signal cable entry 3/4" NPT (INT) or specified adaptor
9 Mains cable entry 3/4" NPT (INT) or specified adaptor
10 Aspirator air supply inlet 1/8" NPT (INT)
11 M6 screws (4 off)
7
115mm 143mm
301mm
115mm
55mm
188mm
19mm
18mm
131mm 125mm
9mm
142mm
40mm 40mm
117mm
85mm
138mm
131mm
123mm
330mm
55mm55mm
1
2
3
9
86
5
4
10
11 6
This dimension depends
on gland type fitted

Servomex 2700 Installation Manual
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3.2 Flange mounting arrangements
3.2.1 Standard installation
The sensor head is provided with a 4" flange. The flange has 8 off 19mm diameter
holes at 45° intervals on a 190.5mm diameter pitch circle (PCD). The sensor head
should be mounted to the flue with at least four M16 or 5/8" bolts or studs spaced
equally around the flange. The sensor head can be mounted to an existing 4" ANSI
150 flange, a weld-on ANSI flange (see Section 3.2.2) or to an existing flange of
another type (see Section 3.2.3). Thermal spacers, high temperature stand-offs and
probe retention flange options are also available for extreme environments. The
length of the mounting bolts required will depend on the mounting options selected.
For installation on an existing 4" ANSI flange provided with clearance rather than
threaded holes then at least four M16x65mm or 5/8"x2½" bolts will be required. The
sensor head will be provided with sufficient gaskets, M16 studding and M16 nuts and
washers to mount the sensor head configuration supplied onto a Servomex weld on
4" flange.
CAUTION
The user should ensure that the flue wall is strong enough to support the weight of
the sensor head and sample probe tube.
SPECIAL INSULATION NOTES
• When a length of stand-off tube is used to secure the mounting flange to the
flue it should be insulated efficiently to prevent problems occurring due to
excessive heat loss to the atmosphere.
• Always minimise the length of this stand-off tube (<100mm typical).
NOTES
• Ensure that mounting bolts are tightened evenly to prevent the sensor head
from tilting, damaging the gasket and causing leaks.
• The sensor head must not be left un-powered when mounted on an active
flue. If the sensor head is not to be fitted immediately then a blanking flange
should be used. Do not plug the hole with the sensor head.
• Included in the installation kit is a sachet of anti-seize compound (part
number 1761-3211) to be used on the sensor head mounting bolts and
studs. Failure to use the anti-seize compound may make the fittings difficult
to remove.

Servomex 2700 Installation Manual
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3.2.2 Weld-on flange installation
If there is no existing flange available then a weld-on flange (part number 02750409)
may be provided. The square (250mm x 250mm) weld-on flange is provided with 8 off
M16 threaded holes at 45° intervals on a 190.5mm diameter pitch circle. Cut a hole
102mm (4 inches) to 127mm (5 inches) diameter in the wall of the duct and weld-on
the flange. If no further mounting options have been ordered then screw the 4 off
M16x55mm studs provided into alternate holes on the flange (at 90° intervals). Place
the gasket over the locating studs, mount the sample probe onto the sensor head
(see Section 3.3), and secure the sensor head onto the flange with the 4 off M16 nuts
and washers.
3.2.3 Adaptor flange installation
A variety of adaptor flange kits are available (see Table 2) for fitting to flanges other
than 4" ANSI 150. The flange on the process duct should be supplied with clearance
holes appropriate to the flange type.
Refer to Figure 3.
Screw the flue mounting studs [8] and the four M16x55mm studs [7] into the
appropriate threaded holes on the adaptor flange [3]. Ensure that the studs do not
protrude through the flange as this will cause damage to the gasket/s and could
cause leaks. Mount the adaptor flange [3] to the flue mounting flange [1] using the
appropriate gasket [2] and secure with the nuts and washers [9] from the reverse.
Attach the sample probe to the sensor head (see Section 3.3). Mount the 2700 sensor
head [5] to the adaptor flange [3] using the 4" ANSI sealing gasket [4] and the 4 off
M16 nuts and washers [6].
Table 2 – Sensor head adaptor flange kits
Servomex
Kit No.
Mating Pattern
Mates WithMtg.hole Qty PCD
02750992 10.8 dia 8 120.6 Servomex Model 700B /N
02750991 M16 4 152.4 3" ANSI 150
02750991 M16 4 145.0 DIN 65 PN16
02750991 M16 4 145.0 JIS 80 5Kg/cm2
02750990 M12 4 130.0 DIN 80 PN16
02750989 M12 4 130 JIS 65 5Kg/cm2
02750988 M16 4 168.3 3" ANSI 300
02750991
18.0 dia
c/bored 38.0
dia 3 168.3
Thermox WDG IV

Servomex 2700 Installation Manual
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Figure 3 Adaptor flange installation
Key to Figure 3 – Adaptor flange installation
1 Mounting flange on flue
2 Gasket to suit flue mounting flange
3 Adaptor flange to suit flue mounting flange (see Table 2)
4 ANSI 4" gasket
5 4" flange on 2700 sensor head
6 M16 nuts and washers (4 off each)
7 M16 by 55mm studs (4 off)
8 Studs (type and length specific to flue mounting flange)
9 Nuts and washers (number and size to suit flue mounting flange)
986
1234
5
7

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15
3.2.4 High temperature stand-off installation
Where there may be excessive heat radiated from the flue wall (350°C to 500°C), a
high temperature stand-off flange kit (part number 02750995) is available to prevent
overheating of the sensor head. The high temperature stand-off is also available with
a probe retention flange (part number 02750996). The high temperature stand-off
consists of two 4" flanges welded onto a 102mm (4 inch) diameter pipe. Each of the
flanges has four M16 threaded and four 19mm plain holes equally spaced on a
190.5mm diameter pitch circle (PCD).
Refer to Figure 4.
• Where necessary fit the weld-on flange or adaptor flanges as described in
Sections 3.2.2 and 3.2.3.
• Mount the high temperature stand-off [3] onto the flue using a 4" ANSI sealing
gasket [2]. If a 4" ANSI weld-on, or adaptor flange, is already fitted then screw
in four of the M16x55mm studs [9] into alternate holes in the weld-on or
adaptor flange [1] and attach the high temperature stand-off through the four
plain holes in the stand-off flange. If the high temperature stand-off is to be
attached to an existing 4" ANSI flange then use four M16x65mm (or 5/8"x2½")
bolts at 90° intervals through the plain holes in the flange (bolts not supplied).
• If a probe retention flange is not required then mount the sample probe onto
the sensor head (see Section 3.3). Mount the sensor head onto the high
temperature stand-off using a 4" ANSI sealing gasket [4]. Screw the four
M16x55 studs [7] into the threaded holes in the stand-off flange and secure the
sensor head with the four M16 nuts and washers [6].
• If a probe retention flange is to be installed then screw the M16x80mm studs
supplied into the threaded holes in the stand-off flange and install the probe
retention flange as described in Section 3.2.6.

Servomex 2700 Installation Manual
16
Figure 4 High temperature stand-off flange installation
Key to Figure 4 – High temperature stand-off flange installation
1 4" ANSI flange on flue with weld-on or adaptor flange fitted
where necessary
2 ANSI 4" gasket
3 High temperature stand-off
4 ANSI 4" gasket
5 4" flange on 2700 sensor head
6 M16 nuts and washers (4 off each)
7 M16 by 55mm studs (4 off)
8 M16 nuts and washers (4 off)
9 M16 by 55mm studs (4 off)
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