EXPO MiniPurge D770/ET User manual

ML564 | v3 26-June-18
D770/ET MiniPurge®
Manual
ML 564
Important Note:
It is essential for safety that the installer and user of the Expo system follow these
instructions.
Please refer to the standard for principles and definition.
These instructions apply only to the pressurizing system. It is the responsibility of the
manufacturer of the pressurized enclosure to provide instructions for the enclosure.
Expo Technologies reserves the right to replace any component, with one of the equivalent functionality.

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Section 1: System Specification................................................................................................1
MiniPurge® Control Unit Data...................................................................................................2
Vortex Cooling Assembly .........................................................................................................3
Relief Valve Unit and Purge Outlet Valve with integral spark arrestor......................................3
Section 2: Quick User Guide......................................................................................................4
Installation ................................................................................................................................4
Operation of the System...........................................................................................................4
Section 3: Application Suitability ..............................................................................................6
Section 4: Description and Principle of Operation ..................................................................7
Section 5: Main Components.....................................................................................................9
Air Supply Filter / Regulator......................................................................................................9
Logic Air Supply Regulator .......................................................................................................9
Minimum Pressure Sensor .......................................................................................................9
Purge Flow Sensor ...................................................................................................................9
Intermediate Sensor .................................................................................................................9
Electronic Purge Timer .............................................................................................................9
Purge Complete Valve..............................................................................................................9
OR Gate .................................................................................................................................10
Alarm Only Circuit (/AO) .........................................................................................................10
Visual Indicators .....................................................................................................................10
Power Interlock Switch ...........................................................................................................10
Alarm / Pressurized Switch.....................................................................................................10
System Purging Switch (Optional)..........................................................................................10
Intermediate Switch ................................................................................................................11
Purge Valve ............................................................................................................................11
Purge Flow Restrictor .............................................................................................................11
CLAPS Sensor .......................................................................................................................11
CLAPS Regulator ...................................................................................................................11
Relief Valve Unit .....................................................................................................................11
/PA Terminal Box....................................................................................................................11
Pneumatic Vortex Cooling Assembly .....................................................................................11
Vortex Cooler Activation Thermostat......................................................................................12
Logic Isolation Thermostat .....................................................................................................12
Section 6: Installation of the System.......................................................................................13
Relief Valve Unit .....................................................................................................................13
Air Supply Quality ...................................................................................................................13
Pipe Work ...............................................................................................................................14
Multiple Enclosures ................................................................................................................14
Provision and Installation of Alarm Devices ...........................................................................14
Power Supplies and their Isolation .........................................................................................14
Power Interlock Switch ...........................................................................................................14
Section 7: Commissioning .......................................................................................................16
Commissioning the System ....................................................................................................16
Normal Operation ...................................................................................................................17
Section 8: Maintenance of the System....................................................................................18
General maintenance .............................................................................................................18
Additional maintenance checks ..............................................................................................18
Maintenance of Electronic Timer ............................................................................................18
Re-calibration of the Relief Valve Unit....................................................................................18
Re-calibration of the Pressure Sensors..................................................................................19
Section 9: Fault Finding............................................................................................................20
General Information................................................................................................................20
System purges correctly but trips and auto re-purges at the end of the purge time...............20
Relief Valve opens (continuously or intermittently).................................................................21
System enters purging but purge indication does not occur...................................................21
System begins purging but cycles fail to complete.................................................................21

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Section 10: Recommended Spares List..................................................................................22
Section 11: Glossary.................................................................................................................22
Section 12: Drawings and Diagrams .......................................................................................22
Section 13: Certifications .........................................................................................................23

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Section 1: System Specification
5 X LC / ss / ET / OV / H7 / PC / PA
Size
5 = MiniPurge®
Purge flow rate:
6000 NI/min
Approval / Certification
Sira 01ATEX1295X
0518 II 2(2) G
Ex [pxb] ia IIC T4 Gb
Tamb -20ºC to +60ºC
IECEx SIR07.0027X
Ex [pxb] ia IIC T4 Gb
Tamb -20ºC to +60ºC
PC = Pressurized Control. Automatic
leakage compensation (CLAPS)
OV = Purge Outlet Valve is
pneumatically operated
Timing Method
ET = Electronic Timer
MiniPurge® Housing
ss = Stainless Steel 316L
Pressurization Method
LC = Leakage Compensation
ATEX Certificate:
IECEx Certificate:
PA = Power and Alarm Switches.
Integral /PA Terminal Box
For limitations and
conditions of use refer to
the applicable certificates.
High Temperature =
Tamb: -20ºC to +60ºC
Purge air Temp: max 70ºC
INMETRO CERTIFICATE:
TÜV 12.1462X
Ex [pxb] ia IIC T4 Gb
Tamb -20ºC to +60ºC

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MiniPurge® Control Unit Data
Action on Pressure Failure: Alarm and Trip (isolate power to pressurized enclosure), user adjustable
Alarm Only.
Type of Operation: Automatic leakage compensation using the Closed Loop Automatic
Pressurization System (CLAPS System).
Leakage Compensation
Capacity
1000 NI/min initial maximum pressurized enclosure leakage.
1900 NI/min maximum as leakage increases.
Enclosure Material: Stainless Steel 316L.
Mounting Method: Wall mounting straps. Fixing holes as per drawing.
Temperature Limits: Ambient -20oC to +60oC
Purge air temperature max = 70oC
Compressed Air Supply: Clean, dry, oil free air or inert gas. Refer to Air Supply Quality section in
Installation of the System.
Supply Pressure: 5 to 16 barg (73 to 232 psi).
Main Regulator: Set at 5 barg, 40 μm automatic drain supply inlet filter.
Logic Regulator and Gauge: Fitted and set to 2.3 barg (33 psi).
Process Connections: Purge supply and outlet to pressurized enclosure 1” NPT female.
Minimum supply line 25 mm (1”) ID tube, inlet sized appropriately for flow
rate.
Reference points & signals 1/8” NPT female, minimum 6 mm pipe to be
used.
Visual Indicators: Alarm (Red ) / Pressurized (Green ).
System Purging: 4 LEDs that flash sequentially to indicate elapsed time
(black when not purging).
/PA Terminal Box: Stainless Steel, Ex e IIC T4 Gb Tamb : -20ºC to +60ºC with terminals,
front access cover & lower removable gland plate.
Power Interlock Switch: DPNO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Alarm Switch: SPCO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Intermediate Switch: SPCO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
System Purging Switch
(Optional):
SPCO switch, contact ratings 250 Vac 4 Amps (AC-15) / 24V DC 4A,
Ex d IIC T6 Gb / Ex tb IIIC T80ºC Db.
Minimum Pressure Sensor: Minimum: 0.5 mbarg.
Maximum: 5.0 mbarg.
Default Setting: 1.5 mbarg.
Tolerance -0, +0.7 mbarg.
Intermediate Sensor: Minimum: 2.0 mbarg.
Maximum: 10 mbarg.
Default Setting: 5.0 mbarg.
Tolerance: -0, +10%.
Note: There must be a 1.5 mbarg difference between the minimum pressure and intermediate sensors.
Purge Flow Sensor: Set at 6.4 mbarg (Tolerance: -0, +10%).
CLAPS Sensor: Minimum: 5.0 mbarg.

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Vortex Cooling Assembly
Relief Valve Unit and Purge Outlet Valve with integral spark arrestor
Maximum:15 mbarg.
Default Setting: 10 mbarg.
Tolerance: -0, +10%
Note: there must be a 2.5 mbarg difference between the intermediate and CLAPS sensor calibration point.
For example: Minimum pressure = 5 mbarg, intermediate pressure = 6.5 mbarg, CLAPS sensor = 9 mbarg.
Purge Time: User selectable, in 1 minute intervals, up to 99 minutes (tolerance -0, +3
seconds).
Default Setting 99 minutes.
Weight: 26 kg (57lb).
Air Consumption during
Operation:
Approx. 200Nl/min.
Noise during Operation: Approx. 92dB.
Type: RLV104/ss/FS, Design number D770RLV.
Bore: Purge Outlet Valve Ø 104 mm, Relief Valve Ø 75 mm.
Relief Valve Lift-Off Pressure: Minimum: 20 mbarg.
Maximum: 50 mbarg.
Default: 30 mbarg (+0, -20%).
Flow Rate: Range: 2000, 3000, 4000, 5000, or 6000 NI/min.
Default: 2000 NI/min.
Material: Housing: Stainless steel 316L.
Gasket: Silicone foam.
Spark arrestor: Stainless steel mesh.
Mounting Method: Rectangular cut-out and fixing holes as per drawing.
Weight: 7 kg (15.4 lb).

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Section 2: Quick User Guide
Installation
The MiniPurge® 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.
• Mount the purge system in accordance with the hook-up drawing.
• Ensure the system is installed according to the full instructions in the “Installation of the System” section of
this manual.
• All pipings must be clean and free of dirt, condensation and debris prior to connection to the purge system or
pressurized enclosure.
• It is strongly recommended that a local isolation valve is installed on the air supply upstream of the purge
system.
Note: Most faults are due to restricted air supply, inadequate supply pipe work or drop in air supply pres-
sure during the purge process.
Operation of the System
Once the system is installed correctly, turn on the air supply. Refer to Commissioning section.
The purge system commences the purge cycle:
• The purge air will enter the enclosure.
• The pressurized enclosure will obtain a positive pressure.
• The Purge Outlet Valve will open within the Relief Valve Unit.
• The air will then exit the Relief Valve Unit housing via the spark arrestor.
Open the Purge Flow Restrictor Valve until the air flow reaches the required rate; the system will initiate the timed
purge cycle. Start a stopwatch when the purging indicator flashes yellow
On completion of an uninterrupted purge cycle of the required length, the system will indicate purge complete.
Indicator Colour Status
Alarm / Pressurized Red Low pressure alarm (enclosure pressure too low)
Purging Black Purge flow too low or not in purge mode
Indicator Colour Status
Alarm / Pressurized Green Pressurized (minimum enclosure pressure achieved)
Purging Black Purge flow too low
Indicator Colour Status
Alarm / Pressurized Green Pressurized
Purging Sequential flashing
Yellow
Purge flow rate above minimum

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Stop the stopwatch when the purging indicator stops flashing.
Check stopwatch timing to verify that the actual purge time is equal to or greater than the required purge time.
Note: The recorded purge time must never be less than the required purge time.
The system is now operating correctly in leakage compensation mode.
If the system has not performed as expected, check the installation thoroughly and ensure it has been carried
out according to the instructions.
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.
Indicator Colour Status
Alarm / Pressurized Green Pressurized and in leakage compensation mode
Purging Black No longer in purge mode

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Section 3: Application Suitability
MiniPurge® 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. Depending on the model the
systems may be used in IECEx and ATEX Zone 1(21) and/or Zone 2(22) - Categories 2 and 3 respectively.
MiniPurge® systems may be used for hazards of any gas group. Apparatus associated with the MiniPurge®
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 MiniPurge® systems. If substances that will adversely
affect any of these materials are present in the surrounding environment, please consult Expo Technologies for
further guidance.
Materials of Construction
Stainless Steel Aluminium Acrylic
Mild (Carbon) Steel Nylon Silicone
Brass Polyurethane Neoprene
ABS Polycarbonate Polyester (glass filled)