EXPO SmartPurge SP2-Px-ss User manual

ML484 | v13 19-Feb-2020
S P 2 - P x - s s S m a r t P u r g e
Manual
ML 484

ML484 | v13 i
Section 1: System Specification ...............................................................................................1
SmartPurge Control Unit Data .................................................................................................1
Electrical Ratings .....................................................................................................................2
Section 2: Quick User Guide .....................................................................................................3
Installation ...............................................................................................................................3
Operation of the System ..........................................................................................................3
Purge Parameter Setup ...........................................................................................................4
Section 3: Application Suitability .............................................................................................5
Section 4: Description and Principle of Operation .................................................................5
Section 5: Main Components ....................................................................................................6
SmartPurge Controller .............................................................................................................6
Air Supply Unit .........................................................................................................................6
Accessories .............................................................................................................................7
Section 6: Installation of the System ........................................................................................7
General Safety Warnings ........................................................................................................8
Electrical Safety .......................................................................................................................8
Compressed Air .......................................................................................................................8
Hazardous area safety ............................................................................................................8
Air Supply Quality ....................................................................................................................9
Purge Outlet Unit .....................................................................................................................9
Non-Intrinsically Safe Terminals ............................................................................................10
Intrinsically Safe Terminals ....................................................................................................10
SmartPurge Interface Unit (SIU) Signal Isolation ..................................................................11
Mounting the SmartPurge and Air Supply Unit ......................................................................11
Remote Control Panel (Optional) ..........................................................................................13
Tristate LED (Optional) ..........................................................................................................14
Section 7: Commissioning ......................................................................................................14
Initial Commissioning .............................................................................................................14
Commissioning ......................................................................................................................14
Section 8: Configuration ..........................................................................................................16
System Configuration ............................................................................................................16
Operational Strategies ...........................................................................................................24
Section 9: Maintenance of the System ...................................................................................27
Routine Maintenance .............................................................................................................27
Repairs ..................................................................................................................................28
Section 10: Fault Finding .........................................................................................................29
Section 11: Recommended Spares List .................................................................................30
Section 12: Drawings and Diagrams ......................................................................................30
Section 13: Certification ..........................................................................................................30

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Section 1: System Specification
SmartPurge Control Unit Data
Model Number
SP2 – ab – c a = Pfor Purge and Pressurize Control Unit
Ffor Fan Control Unit
b= Mfor Mains Universal Voltage
Lfor Low Voltage
c = ss for Stainless Steel
Purge Flow Range Leakage Compensation: 110 - 540 Nl/min
Continuous FLow 10 - 540 NI/min
Purge Time 1-99 minutes
Low Pressure Trip Options Immediate Trip, Alarm Only, Delay Trip (Up to 99 mins)
Enclosure Pressure 0.8 - 7 mbarg after purge
Environmental Protection IP64 316 Stainless Steel Enclosure
Mounting Position May be mounted in any position external to pressurized enclosure
Control Unit Dimensions Stainless steel = 187 x 139 x 107 mm (7.3" x 5.3" x 4.2")
Temperature -20ºC to +60ºC
Approvals IECEx
IEC 60079-0 : 2017
IEC 60079-11 : 2011
IEC 60079-18 : 2017
IEC 60079-2 : 2014-07
IEC 60079-31 : 2013
IEC 60079-7 : 2017
IECEx FME11.0006X
Ex eb ib mb [ib Gb] [p] IIC T4 Gb
Ex tb [p] IIIC T135ºC Db
-20°C to +60°C
ATEX
2813 II 2 (2) GD
EN IEC 60079-0 : 2018
EN 60079-2 : 2014
EN 60079-7 : 2015+A1:2018
EN 60079-11 : 2012
EN 60079-18 : 2015 + A1:2017
EN 60079-31 : 2014
EN 60529 : 1991 + A1:2000 + A2:2013
FM11ATEX0060X
Ex eb ib mb [ib Gb] [p] IIC T4 Gb
Ex tb [p] IIIC T135ºC Db
-20°C to +60°C

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Electrical Ratings
SmartPurge Control Unit
* Note: The rated current of power contact is for resistive load ONLY. The max transient current of
power contact is 15A, exceeding the value would significantly shorten the life of power contact or
cause instant damage.
Energy limitation parameters:
Remote Panel, energy limitation parameters
USA
ANSI/ISA 60079-0
ANSI/ISA 60079-11
ANSI/ISA 60079-18
ANSI/ISA 60079-2
ANSI/ISA 60079-31
ANSI/ISA 60079-7
ANSI/IEC 60529
Class I, Zone 1
AEx e ib mb [p] IIC T4 IP64
Class I, Zone 21
AEx tb [pD] IIIC 135ºC IP64
-20ºC to +60ºC
Canada
CAN/CSAE 60079-0
CAN/CSAE 60079-11
CAN/CSAE 60079-18
CAN/CSAE 60079-2
Ex e ib m [p] IIC T4 Gb IP64
-20ºC to +60ºC
Safety Integrity Level ESC: A127_CT001_(2.0)
Weight 4.2kg (9.3lb)
Power Supply (Terminals 1, 2): 90 - 254 Vac: Universal
Voltage
11 - 28 Vdc: Low Voltage
Um = 254 Vac
Alarm Contact
Ratings:
(Terminals 5, 6 and 7, 8) 240 V, 1 A Fuse type (see Installation of the System
section for details
(Terminals 9, 10) 100 mA (mains voltage) 500 mA (low voltage)
Power Switching 2 pole 6 A 250 V AC1 *
5 A 30 V DC1 *
Terminal TB1 Uo (Vdc) Io (mA) Co (μF) Lo (mH) Po (W)
SOV 1, 2 23.58 165.5 0.091 2.9 0.975
IP 3,4 23.58 165.5 0.091 2.9 0.975
Remote Output 9, 10, 11, 12 8.465 405.1 5.145 0.48 0.857
External Alarm 5, 6 5.88 5.9 negligible 00.009
Override 7, 8 5.88 5.9 negligible 00.009
Ui (Vdc) Ii (mA) Ci (μF) Li (mH) Pi (W)
8.465 405.1 5.145 0.48 0.857

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Section 2: Quick User Guide
Installation
The SmartPurge System must be installed by a competent engineer, in accordance with relevant standards,
such as IEC / EN 60079-14 and any local codes or practice.
• Fit the appropriate orifice plate to the system if required
• Mount the purge system in accordance with the hook-up drawing.
• Ensure the system has been installed according to the full instructions in the Installation of the System
section of this manual.
• All piping must be clean and free of dirt, condensation and debris prior to connection to the purge system
or pressurized enclosure.
Note:
It is essential for safety that the installer and user of the Expo system follow these instructions.
Operation of the System
Once installed correctly follow the directions below to make the system operational.
This Quick User Guide is the minimum necessary for the system to operate. Detailed information about
system set up can be found in the Configuration section.
When first switched on the system will display the serial number. Check that this corresponds with the system
documentation.
The Purge System Status menu will be displayed and it is possible to use and to scroll through
the menu to view the current system status, action on alarm and the current pressure sensor readings.
Follow directions on the next page to set up purge parameters.
Once the parameter entry has been completed, switch the air supply on. Slowly increase the pressure inside
the pressurized enclosure using the LC valve. When the required minimum pressure is reached, the
SmartPurge will initiate the purge cycle.
The elapsed purge time will be shown in the display, once a successful cycle had completed, the power to the
electrical equipment in the pressurized enclosure will be connected.
If the system has not performed as expected, check the installation thoroughly and consult the System
Configuration and Operation of the System sections.
If an obvious problem has not been highlighted and corrected, follow the procedures in the Fault Finding
section.
If all checks have been carried out and the system still does not perform as expected, contact your local
distributor or Expo Technologies.

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Purge Parameter Setup
End: system is
now ready for
operation
After 30 seconds the
display will return to
"Purge System Status"
Once High pressure has
been set display will
return to "Purge
Parameters menu
Enter "Purge
Parameters" sub-menu
and change settings to
those on test and
inspection sheet.
Scroll through
sub-menu screens
until you reach "Purge
Parameters"
Sub-menu
Enter Operator
Password
Scroll through menu
screens until you reach
"Parameter Entry"
menu
Start At Purge
System Status
Display
Use to scroll
and to enter
menu
Use and to
change numbers and
to enter
Use and to change
numbers and to enter (enter
will also move you to the next
parameter)
use and to scroll
and to enter sub menu

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Section 3: Application Suitability
SmartPurge systems are certified for use in hazardous locations, where the hazardous location is non-mining
(above ground) and the hazard is caused by flammable gasses, vapours or dust. The system may be used in
IECEx and ATEX Zone 1(21) and Zone 2(22) - Categories 2 and 3 respectively.
Installations in the United State shall comply with the relevant requirements of the National Electrical code®
(ANSI/NFPA-70 NEC).
Installations in Canada shall comply with the relevant requirements of the Canadian Electrical code (CSA
C22.1).
SmartPurge systems may be used for hazards of any gas or dust group. Apparatus associated with the
SmartPurge system, such as intrinsically safe signalling circuits and flameproof enclosures containing
switching devices may be limited in their gas group. The certification documentation supplied with any such
devices must be checked to ensure their suitability.
This system is primarily designed for use with compressed air. Where other inert compressed gasses are
used (Nitrogen, for example) the user must take suitable precautions so that the build up of the inert gas does
not present a hazard to health. Consult the Control of Substances Hazardous to Health (COSHH) data sheet
for the gas used. Where a risk of asphyxiation exists, a warning label must be fitted to the pressurized
enclosure.
The following materials are used in the construction of SmartPurge systems. If substances that will adversely
affect any of these materials are present in the surrounding environment, please consult Expo Technologies
ltd for further guidance.
Section 4: Description and Principle of Operation
Purge and pressurization is a method of protection used in Zone 1 (21) and Zone 2 (22) hazardous locations
to ensure that the interior of an enclosure is free of flammable gas. Addition of a SmartPurge system allows
the electrical equipment within the enclosure to be used safely in a hazardous location.
The principle of purge and pressurization is as follows:
• Clean compressed air or inert gas is drawn from a non-hazardous location.
• The interior of the pressurized enclosure is flushed to remove any hazardous gas or dust.
• This is introduced into the pressurized enclosure to keep the internal pressure at least 0.5 mbarg above
the external pressure.
• Whilst pressurized, flammable gas cannot enter the enclosure from the environment.
Materials of Construction
Stainless Steel Nylon Acetal
Mild (Carbon) Steel Acrylic Silicone Foam
Brass Polyurethane PVC Foam
Aluminium Polycarbonate

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Prior to switching on the power to the electrical equipment, the enclosure must be purged to remove
any flammable gas that might have entered the enclosure before pressurization. Purging is the process of
removal contaminated air and replacement with air (or inert gas) known to be free from flammable gas. The
duration of this purge process is normally ascertained by performing a purge test.
The SmartPurge system controls the release of purge air, drawn from a non hazardous location, into the
enclosure containing electrical equipment. After the purging cycle, the system connects the power to the
equipment to be protected. It then monitors the enclosure pressure to ensure that an overpressure is
maintained.
The system is fully automatic in operation, and can be configured by the user to meet the application
requirements. If the pressure inside the protected enclosure drops below the minimum threshold the system
will either shut down the electrical apparatus and / or give an alarm signal depending on the configuration.
The default setting is immediate disconnect of the power.
Section 5: Main Components
SmartPurge Controller
The SmartPurge Control Unit is an electronic unit designed to be used in the hazardous location, it provides
the following functions:
•Microprocessor controlled purge and delay timing
•Isolation to equipment (2 pole rated 6A @ 230V AC1 duty)
•2 Status / Alarm contacts (user configurable)
•System status indication via LCD
•Delay isolation option
•Monitoring and control of purge flow
•Monitoring and control of enclosure pressurization
•Optional Remote Control Panel duplicates the front panel display and
keypad
Air Supply Unit
The SmartPurge controls the flow of protective gas into the pressurized enclosure through the Air Supply Unit.
There are three varieties of unit:
Solenoid Digital Valve for Manual Leakage Compensation – SP2-DV
This is designed for leakage compensation purging applications. The flow of gas
through the pressurized enclosure is controlled by the SmartPurge Controller. This
allows switching between the purging and leakage compensation phases of the
purge and pressurization cycle.
Continuous Flow Control Valve – SP2-CF
This is designed for continuous flow purging applications. The air flow through the pressurized enclosure is
controlled by a needle valve. Suitable for low flow rate applications, applications where a continuous flow of
air is required for cooling or when the dilution of hazardous gases generated inside the enclosure is required.

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Accessories
Remote Control Panel – SP2-RP
This allows the SmartPurge system to be controlled from a remote
location. It is an Intrinsically Safe device that duplicates the display and
4 control buttons on the front of the main SmartPurge Unit. The Remote
Control Panel is connected to the main unit by means of a shielded 2
twisted pair cable. The cable should not be longer than 50 metres, and
have a cross sectional area of at least 0.75 mm2.
It is not possible to perform operations at both keypads simultaneously.
The keypad that is in use will “lock-out” operation at the other keypad
until the data entry is complete or the display times out and returns to the
Purge System Status Display.
An error message is displayed if a key is pressed while another display is being used.
When entering passwords, the password being entered will only show on the control terminal display which
is in use. The other display will show “0000” during password entry.
Cable Gland Kit – SP2-GK
An Expo recommended set of cable glands for field wiring. M16 Gland for cable of outer diameter 4 – 8.4 mm
and M20 Gland for cable of outer diameter 7.2 – 11.7 mm
Remote LED – SP2-RL
Tri-colour remote indication of purge systems status.
Override Switch – SP2-OS
A panel mounting, key operating switch that bypasses the SmartPurge Controller output signal.
Splash Cover – SP2-SC
A cover to protect the outlet valve from direct water jets.
SmartPurge Interface Unit – SIU
A flameproof interface used for switching higher loads or additional signals.

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Section 6: Installation of the System
The SmartPurge is designed for use under normal industrial conditions of ambient temperature, humidity and
vibration. Please consult Expo before installing this equipment in conditions that may cause stresses beyond
normal industrial conditions.
The SmartPurge system must be installed by a competent person in accordance with relevant standards, such
as EN 60079-14, and any local Codes of Practice that are in force.
The SmartPurge control unit should be installed either directly on, or close to the pressurized enclosure. It
should be installed such that the system display and certification labels are in view. The system should not be
subject to vibration. If to be mounted on a surface that may transmit vibrations it is recommend that the
SmartPurge control unit is first mounted onto a chassis plate which is mounted via Anti-Vibration (AV) mounts.
General Safety Warnings
The Expo SmartPurge purge and pressurization system must only be used in accordance with the instructions
in this manual and for the purpose described earlier.
Failure to comply with the instructions in the manual during operation, installation, commissioning and
maintenance may lead to personal injury, damage to property or voiding of the warranty and/or certification of
the SmartPurge system.
The use of a certified purge and pressurization system does not guarantee or imply the compliance of the
complete enclosure with ATEX or IECEx standards. Such compliance can only be endorsed by an EU Notified
Body.
Installation must be carried out in accordance with these instructions in conjunction with any applicable local
Codes of Practice or standards. The units should be configured prior to installation using the following
guidelines.
Electrical Safety
The system control unit contains components which may be live when powered. Always isolate power from
supply to the SmartPurge and the enclosure before opening.
Torque for electrical terminals
Intrinsically safe terminals: 0.22 - 0.25 Nm
Non-intrinsically safe terminals: 0.4 - 0.5 Nm
Compressed Air
The system uses compressed air.
• Take precautions when connecting or disconnecting compressed air supplies.
• Ensure all flexible pipes used are well secured.
• Never block compressed air pipes with any part of the body.
• Ensure that equipment is maintained in good condition.
• The system exhausts air from the compressed air supply into the atmosphere so a clean supply must be
used. Do not allow the exhaust air to be breathed.

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Hazardous area safety
The system is designed for use in hazardous areas; correct installation and maintenance are critical for safe
operation. Installation and maintenance must only be carried out by qualified and authorized personnel in
accordance with local and site regulations.
No unauthorised modifications to the equipment should be made. Purging should be done in accordance with
the relevant standard.
Air Supply Quality
The SmartPurge system should be connected to a protective gas supply, which is suitable for purging and
pressurization.
The supply pipe connection to the SmartPurge must be appropriate for the maximum input flow rate for the
application.
The air supply must be regulated at a pressure less than the maximum stated inlet pressure.
The air supply must be: clean, non-flammable and from a non-hazardous location. The air should be of
Instrument Air Quality. Although the purge control system will operate with lower air quality, its operational life
will be adversely affected. The equipment that is being protected by the SmartPurge may also suffer because
of poor air quality.
With reference to BS ISO 8573-1: 2010, Instrument Air is typically specified as:
Particle Class 1
In each cubic metre of compressed air, the particulate count should not exceed 20,000 particles in the 0.1 to
0.5 micron size range, 400 particles in the 0.5 to 1 micron size range and 10 particles in the 1 to 5 micron size
range.
Humidity or pressure dew point
The dew point, at line pressure, shall be at least 10 °C below the minimum local recorded ambient temperature
at the plant site. In no case, should the dew point at line pressure exceed +3 °C.
Oil Class 2
In each cubic metre of compressed air, not more than 0.1mg of oil is allowed. This is a total level for liquid oil,
oil aerosol and oil vapour.
When an inert gas is being used to supply the purge system, risk of asphyxiation exists. Refer to Application
Suitability section.
Before connection of the air supply to the purge system, the supply pipe work should be flushed through with
instrument quality air to remove any debris that may remain in the pipes. This must be carried out for at least
10 seconds for every meter of supply pipe.
Unless a supply shut-off valve has been fitted to the SmartPurge system, an external shut-off valve with the
same, or larger, thread size as the Control Unit inlet fitting should be fitted by the installer to prevent any
restriction of purge flow.
The purge air from the SmartPurge Control Unit should be piped within the pressurized enclosure to ensure
purging of potential dead air spots.

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The purge system is fitted with an internal regulator factory set to 3 bar feeding the logic.
Purge Outlet Unit
The Purge Outlet Unit is housed within the SmartPurge enclosure and measures flow across an orifice. It is
preset to open at an enclosure pressure of 8 - 10 mbarg.
A Spark Arrestor is added to the exhaust point of the Purge Outlet Unit to prevent the emission of arcs, sparks
and incandescent particles produced within the pressurized enclosure.
SmartPurge Controller Unit
SmartPurge has four M5 mounting points for mounting the unit to a flat surface on the pressurized enclosure,
refer to appropriate General Arrangement drawing and connected in accordance with the Hook-Up drawing.
Connections to the SmartPurge must be through the M20 & M16 Ex e cable entries. If cable entries are not
going to be used, an Ex e blanking plug must be fitted in place of the cable gland.
Non-Intrinsically Safe Terminals
Terminals 1 – 2 and earth: mains input
The unit must be supplied from a separately switched, labelled circuit with over current protection of not
greater than 6 Amps.
The protective earth conductor must be securely attached to the protective earth terminal on the SmartPurge
terminal cover plate.
The SmartPurge is housed in and increased safety (Ex e) enclosure. This must be earthed using an earth
conductor of minimum 4 mm2, connected to the earth connection on the outside of the unit.
Terminals 3 – 4: mains output
The SmartPurge system provides a switched mains voltage output that can be used to power the protected
equipment. It can also be used to drive relays and contactors that provide the necessary switching function.
The load connected to the output from the SmartPurge must not exceed 6 A (AC1). For the Low Voltage
version, load must not exceed 5A, 28 Vdc.
Note: The rated current of power contact is for resistive load ONLY. The max transient current of power
contact is 15A, exceeding the value would significantly shorten the life of power contact or cause instant
damage.
Terminals 5 – 6 and 7 – 8: alarms
The SmartPurge system provides two volt-free contacts rated 250 V, 1 A AC1. These provide remote
indication of the state of the purge system and for the generate alarm signals.
A fuse or other current limiting device must be placed in the circuit connected to these status contacts to limit
the current to below that specified. This must have a breaking capacity of 1500 Amps or greater. The fuse or
circuit breaker used must have an "F" characteristic to IEC 127 for a fuse, or type B characteristic for a
miniature circuit breaker. Where other types of fuse or circuit breaker are used, the user must verify that the
switching contacts have not been welded together by the current flowing in the time taken for the fuse to blow
or circuit breaker to trip.
The status / alarm outputs must not be used to control the switching of power to the protected equipment.

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Terminals 9 – 10: fuse
Fuse connection, See Electrical Ratings for AC and DC versions
Intrinsically Safe Terminals
All connections to these terminals must be made from intrinsically safe circuits in accordance with the Hook-
Up drawing.
Terminals 1 – 2: intrinsically safe solenoid valve
1. power supply +
2. power supply -
Terminals 3 – 4: intrinsically safe I/P converter
4 – 20 mA output:
3. current loop +
4. current loop -
Terminals 5 – 6 intrinsically safe external alarm
Refer to the wiring diagram for fitting of resistors.
Terminals 7 – 8 intrinsically safe override keyswitch
Refer to the wiring diagram for fitting of resistors.
Terminals 9 – 10 – 11 – 12: remote panel (or tristate LED)
5. power supply + (or common cathode)
6. data + (or Anode: Green)
7. data - (or Anode: Red)
8. power supply -
SmartPurge Interface Unit (SIU) Signal Isolation
The following signals may need to be considered for isolation by the SmartPurge system:
• Video Signals
• Network cables (e.g. Ethernet, ARCNet, MODBUS)
• Current loops
• Status signals
• 3 phase power supplies
Note: 3 phase and neutral supplies need all 4 wires to be isolated. Earth wires should not be isolated.
Take care not to overtighten screws.
Mounting the SmartPurge and Air Supply Unit
Before mounting the SmartPurge, it should be configured for the flow range required. To carry out this
configuration, choose the appropriate flow rate from Table 1

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Locate the appropriate Orifice Plate and Flow Restrictor (where necessary).
Using the 2 screws supplied, fix the orifice plate in position in the air entry into the SmartPurge. Refer to Figure
1 for guidance.
For systems that are using the SDV (solenoid digital valve) option, screw the brass flow restrictor into the
outlet from the SDV. A slot for a screwdriver is provided in the restrictor to assist in this operation.
The SmartPurge settings need to be configured to the new orifice size.
Normally, the SmartPurge and Air Supply Units will be mounted in diagonally opposite corners of the
enclosure to be protected.These units may be mounted internally or externally. For internal mounting of the
SmartPurge, use an EXPO adaptor plate accessory. Pipe work to and from the air supply unit must be sized
to provide adequate airflow with the minimum pressure drop (restrictive pipe fittings should be avoided). The
air outlet from the Air Supply Unit should be located or piped to the opposite side of the enclosure to ensure
effective purging, unless effective purging can be proved by other means.
It is recommended that all air supply pipe work be a minimum of 10 mm x 1 mm (3/8”)
If adequate air pressure regulation and filtration cannot be assured, it is recommended that a filter regulator
set is installed at the air inlet.
Remember that the minimum air supply pressure requirements quoted are those needed during purge. Long
pipe runs or restrictive pipes and fittings may cause substantial pressure drops.
Figure 1:

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Note: The minimum air supply requirements shown in the table above are greater than those shown for the
certified minimum flow rate. This is to allow for the additional air required to make up for enclosure leakage
and the tolerance of the air flow measurement
Store the orifice plate(s) and flow restrictor(s) which are not used so that the unit may be reconfigured if
required at a future date. Record the selections made in the maintenance record of this manual and mark the
flow range selected on the label with an indelible marker. If required, it may be possible to use a custom inlet
or outlet flow restrictor in order to achieve satisfactory purge operation. Only standard 8 & 16 hole outlet
orifices should be used. SmartPurge allows for custom orifice settings. Consult EXPO for further information..
Table 1: Air Supply Requirements
Flow
Range
Inlet Flow
Restrictor (for
SDV only)
Outlet orifice
Certified
Minimum Flow
Rate
Minimum Air Supply Requirement
Pressure at Flow
Nl/min (scfm) Bar (psi) Nl/min (scfm)
A
Ø2.7mm hole
8 Hole
= 13 mm
150 (5) 3.1 (45) 212 (7.5)
B
Ø4.2mm hole
16 Hole
= 18mm
300 (10) 3.5 (50) 414 (15)
CNone None = 25 mm 540 (19) 4.5 (65) 848 (30)

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Remote Control Panel (Optional)
The SmartPurge system may be controlled from a remote location by using the Remote Control Panel.
Refer to the drawings section for the dimensions and connection schematic for the Remote Control Panel.
The case of the Remote Control Panel has an external earth terminal. This must be used to bond the case to
earth using a 4mm2 cable minimum.
The remote terminal and the main unit must be installed in an environment where the equipotential bonding
system exists over the entire area of the installation. The keypad and display of the remote terminal is used
in exactly the same manner as those on the main unit.
It is not possible to perform operations at both keypads simultaneously. The keypad that is in use will “lock-
out” operation at the other keypad until the data entry is complete or the display times out and returns to the
Purge System Status Display.
Tristate LED (Optional)
This is a simple remote indication of purge status.
• Purge Complete: Green
• Purge in Progress: Amber
• Purge Low Flow: Flashing Red / Green
• Pressure Fault: Red
A stainless steel bezel mounts in a 22 mm hole and is connected to terminals 9 – 10 – 11. The maximum cable
length between the SmartPurge Control Unit and the Tritsate LED is 50 m. This panel can only be used when
the remote panel is not present.
Section 7: Commissioning
Initial Commissioning
Note: The system is pre-set and no adjustments (other than those detailed in this document) should
be made without consultation with Expo.
• Ensure the SmartPurge has been correctly installed.
• Ensure that all electrical power to the enclosure being protected is isolated.
• Check all pipe work and wiring is in accordance with appropriate instructions and wiring diagrams.
• Check all doors, inspection covers and other openings in the enclosure are sealed and secure.
• Close the leakage compensation valve fully (where fitted).
Commissioning
• Turn on the air supply to the Air Supply Unit.
• Turn on the SmartPurge Control Unit.
• For leakage compensation systems, slowly open the leakage compensation needle valve until the
enclosure pressure builds up above the lower limit: the Low Pressure Fault message will change to

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Purge Flow Low. Once this happens, the solenoid valve in the Air Supply Unit will turn on the
purge air flow. It may take several seconds before the enclosure pressure reaches the required level.
To monitor the pressure on the display panel, press the down arrow once and the pressure in millibars will
be shown. Use the pressure display to adjust the setting of the leakage compensation regulator.
Typical enclosure pressures:
• To verify that sufficient purge air flow is being detected, ensure that the display on the front of the
SmartPurge shows Purge in Progress and a countdown of the purge time or purge volume. A Purge
Flow Low or Purge Flow High message will be displayed if flow is insufficient. if this happens, increase
or decrease the pressure of the air supply to the unit to increase the flow until the Purge in Progress
message appears.
If the purge flow is high enough to cause an overpressure situation, the system will turn off the purge air
flow until the pressure falls below the high pressure setting. If this is occurs, reduce the purge flow rate by
reducing the supply pressure, and re-start the purge cycle.
• Check that the system continues purging for the correct time or volume. Power will then be connected to
the protected equipment.
• To allow for variations in temperature and air supply pressure, open the leakage compensation valve and
increase the air supply pressure by approximately 5% of the value. Observe the pressure display to
ascertain when the appropriate pressure is reached. This gives sufficient flow to trigger the flow sensor
during purge.
• Record the air supply pressure and observed purge time in the maintenance record section of this
handbook.
• All the critical settings of the purge parameters are protected from unauthorised modification by means of
a password access to the settings areas of the SmartPurge Menu System. Once the system is configured,
change the password from the default setting of 0000 to prevent modification by unauthorised
personnel.
• Check function of alarm contacts when pressure drop below 0.5 mbar occurs.
• If correct operation is not observed refer to the fault finding section of this handbook.
Normal Operation: 2.5 mbarg
During Purge: 9 mbarg
Minimum Pressure: 1 mbarg
Maximum Pressure: 14 mbarg

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Section 8: Configuration
System Configuration
Once the SmartPurge Controller has been installed it must be configured and settings such as the low
pressure, purge flow method and orifice diameter must be set up. The SmartPurge controller is configured
using the operators and a two-line display. Refer to the icons below for name and description of each button.
The Test and Inspection Sheet supplied with the unit will show the factory set parameters.
To aid the user in configuring the system to their requirements the Settings sheet should be completed.
The default screen for the SmartPurge displays Purge System Status, which provides information related to
the current state of the purge system.
The top line of the display will give a general message, such as Purge System Status and the bottom line
will give supplementary information, such as an alarm message. Pressing the Up or Down buttons will cycle
the bottom line through any supplementary messages that may be relevant.
Only prompts and parameters appropriate to selected purge method are shown on the menu system.Options
that cannot be combined will not be shown.
Pressing the menu button enters the menu system. Each press of the menu button moves the system on to
the next menu item, until the display returns to the Purge System Status display.
To change numbers for passwords or settings use or to increase or decrease the flashing number
0-9.Then press to accept entry.
Once accepted the next digit will be highlighted for change or the complete entry will be accepted.
To scroll through sub-menus use or Then press to choose menu.
Once accepted the next menu will be highlighted for change or the complete entry will be accepted.
Some menus will request confirmation by displaying Confirm? Y / N. Press for Yes and for No.
Menu Button This moves to the next menu item
Up Button This allows the user to scroll to the previous menu, confirm
Yes, display last parameter or increase digit
Down Button This allows the user to scroll to the next menu, confirm No,
display next parameter or decrease digit.
Enter Button This allows the user to scroll to select menu item or entry.

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Menu
E: Password Override
Purge Start
Auto Manual
Purge Parameters
Enclosure Volume Volume Changes Purge Air Volume Orifice Diameter Minimum Flow Rate Maximum Flow Rate Purge Time Delay Time Low Pressure Low Pressure Pre-Alarm High Pressure Enclosure Target Pressure Minimum Dilution Rate
Alarm 2 Function
General Alarm Pressure Correct Pressure Not Correct Purge In Progress Low Pressure alarm Ready to Purge
Alarm 1 Function
General Alarm Pressure Correct Pressure Not Correct Purge In Progress Low Pressure alarm Ready to Purge
External Alarm
Power Off System Trip Purge Start
Trip Function
Immediate Trip Alarm Only and Re-Purge Delay Trip and Re-Purge Alarm Only Delay Trip
Purge Flow Method
Continuous Flow 2-Con Flow (IS DV) 2-Con Flow (I/P conv) Leakage Compensation (IS DV) Leakage Compensation (I/P conv)
Purge Timing Method
Elapsed Time Adaptive Flow
F: Parameter Entry *
Zero Sensors
Re-zero flow and press Enter key to set
Reset Passwords
Enter key to set
Sensor Full Scale
70 mbar
Voltage Monitor *
M: x.xxV S: x.xxV
Orifice
13 mm 18 mm 25 mm Custom dp Flow
Pressure 70 mbar
Cal Pressure 70 mbar, Enter key to set
Pressure Zero
Cal Pressure Zero, Enter key to set
D: Passwords
Change Operator Password Change Override Password Sensor Calibration
C: Settings Display *
Enclosure Volume Volume Changes Purge Air Volume Minimum Flow Rate Purge Start Purge Time Delay Time Low Pressure Low Pressure Pre-alarm Enclosure Target Pressure High Pressure Trip Function Ext Alarm Function Purge Flow Method Purge Timing Method Orifice Diameter Alarm 1 Function Alarm 2 Function Serial Number
B: Language
English En Français F Deutsch Español E Italiano Norsk
A: Purge System Status *
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