EXPO MiniPurge D829/ET User manual

ML538 | v8 19 January 2024
D829/ET MiniPurge®
Manual
ML538
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.

ML538 | v8 i
System Specification .................................................................................................................1
MiniPurge® Control Unit Data .................................................................................................2
Pressure Relief/Outlet Valve with Integral Spark Arrestor .......................................................3
Quick User Guide .......................................................................................................................3
Installation ...............................................................................................................................3
Operation of the System ..........................................................................................................3
Application Suitability ................................................................................................................4
Description and Principle of Operation ....................................................................................5
Main Components ......................................................................................................................6
Air Supply Filter / Regulator .....................................................................................................6
Logic Air Supply Regulator ......................................................................................................6
Minimum Pressure Sensor ......................................................................................................6
Purge Flow Sensor ..................................................................................................................6
Electronic Purge Timer ............................................................................................................7
Purge Complete Valve .............................................................................................................7
Purge Inhibit Sensor ................................................................................................................7
OR Gate ..................................................................................................................................7
Alarm Only Circuit (/AO) ..........................................................................................................7
Power Interlock Switch ............................................................................................................7
Alarm / Pressurized Switch ......................................................................................................8
System Purging Switch (Optional) ...........................................................................................8
Purge Valve .............................................................................................................................8
Purge Flow Restrictor ..............................................................................................................8
CLAPS Sensor ........................................................................................................................8
CLAPS Regulator ....................................................................................................................8
Visual Indicators ......................................................................................................................8
Relief Valve Unit ......................................................................................................................8
/PA Terminal Box .....................................................................................................................9
Installation of the System ..........................................................................................................9
Relief Valve Unit ......................................................................................................................9
Air Supply Quality ....................................................................................................................9
Pipe Work ..............................................................................................................................10
Multiple Enclosures ...............................................................................................................10
Provision and Installation of Alarm Devices ..........................................................................10
Power Supplies and their Isolation ........................................................................................10
Power Interlock Switch ..........................................................................................................11
Commissioning ........................................................................................................................11
Commissioning the System ...................................................................................................11
Maintenance of the System .....................................................................................................13
General maintenance ............................................................................................................13
Additional maintenance checks .............................................................................................14
Maintenance of Electronic Timer ...........................................................................................14
Re-calibration of the Relief Valve Unit ...................................................................................15
Re-calibration of the Pressure Sensors .................................................................................15
Fault Finding ............................................................................................................................16
General Information ...............................................................................................................16
System purges correctly but trips and auto re-purges at the end of the purge time ..............16
Relief Valve opens (continuously or intermittently) ................................................................17
System enters purging but purge indication does not occur ..................................................17
Recommended Spare List .......................................................................................................17
Glossary ....................................................................................................................................18
Drawings and Diagrams ..........................................................................................................18
Certificates ................................................................................................................................18

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1
ML538 | v8
Expo Technologies UK
T: [phone]
E: [email protected]
Expo Technologies US
T: [phone]
E:[email protected]
Expo Technologies China
T: [phone]
E: [email protected]
Section 1: System Specification
3 X LC / ss / ET / OV / PC / PA / D829
Size
3 = MiniPurge® Purge
Flow Rate:
1000 - 1500 NI/min
Approval / Certification
Sira 01ATEX1295X
2813 II 2(2) G
Ex [pxb] ia IIC T5 Gb
Tamb -20ºC to +55ºC
IECEx SIR07.0027X
Ex [pxb] ia IIC T5 Gb
Tamb -20ºC to +55ºC
TÜV 12.1462X
Ex [pxb] ia IIC T5 Gb
Tamb -20ºC to +55ºC
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:
TÜV INMETRO Certificate:
PA = Power and Alarm. Integral Ex e
Terminal Box
For limitations and conditions of use refer to the applicable certificates on ML497
2020312304000830
Ex [pxb] ia IIC T5 Gb
Tamb -20ºC to +55ºC
CCC Certificate:
ЕАЭСRU С-RU.АЖ58.В.00906/20
1Ex [px] ia IIC T5 Gb
-20ºC ≤ Tamb ≤ +55ºC
EAC Certificate:

ML538 | v8 Page
2
Expo Technologies UK
T: [phone]
E: [email protected]
Expo Technologies US
T: [phone]
E:[email protected]
Expo Technologies China
T: [phone]
E: [e-mail]
MiniPurge® Control Unit Data
Action on Pressure Failure: Alarm and Trip (isolate power to pressurized enclosure), user adjusta-
ble Alarm Only.
Type of Operation: Automatic leakage compensation using the Closed Loop Automatic
Pressurization System (CLAPS System).
Leakage Compensation Capacity: 500Nl/min @ 4barg inlet pressure
Leakage Compensation Over Ca-
pacity:
+40% (minimum) of the normal enclosure leakage
Enclosure Material: Stainless Steel 316L.
Temperature Limits: -20oC to +55oC
Compressed Air Supply: Clean, dry, oil free air or inert gas. Refer to Air Supply Quality section
in Installation of the System.
Supply Pressure: 4 to 8 barg (60 to 120 psi).
Main Regulator: Set at 5 barg, 40 mm 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 ½” NPT female.
Minimum supply line 13mm (½”) ID tube, inlet sized appropriately for
flow rate.
Reference points & signals 1/8” NPT female, minimim 6mm 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 T5 Gb Tamb: -20ºC to +60ºC with terminals,
front access cover & lower removable gland plate.
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 4A (AC-15) / 24V DC 4A,
Ex d IIC T6 IP66.
Alarm Switch: SPCO switch, contact ratings 250 Vac 4A (AC-15) / 24V DC 4A,
Ex d IIC T6 IP66.
System Purging Switch (Optional): SPCO switch, contact ratings 250 Vac 4A (AC-15) / 24V DC 4A,
Ex d IIC T6 IP66.
Minimum Pressure Sensor: Minimum: 0.5 mbarg.
Maximum: 5.0 mbarg.
Default Setting: 1.5 mbarg.
Tolerance -0, +0.7 mbarg.
Purge Inhibit Settings: Minimum: 2.0 mbarg.
Maximum: 12 mbarg.
Default Setting: 12 mbarg.
Tolerance -0, +10%.
Purge Flow Sensor: Set at 6.4 mbarg (Tolerance: -0, +10%).
CLAPS Sensor: Minimum: 5.0 mbarg.
Maximum: 15 mbarg.
Default Setting: 10 mbarg.
Tolerance: -0, +10%

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ML538 | v8
Expo Technologies UK
T: [phone]
E: [email protected]
Expo Technologies US
T: [phone]
E:[email protected]
Expo Technologies China
T: [phone]
E: [email protected]
Pressure Relief/Outlet Valve with Integral Spark Arrestor
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 piping 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
pressure 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.
Purge Time: User selectable, in 1 minute intervals, up to 99 minutes (tolerance -0,
+3 seconds).
Default Setting 99 minutes.
Weight: 16 kg (35lb).
Type RLV52/ss/FS, Design number D779RLV
Bore: Purge Outlet Valve Ø 52 mm, Relief Valve Ø 52 mm.
Relief Valve Lift-Off Pressure: Minimum: 20 mbarg.
Maximum: 50 mbarg.
Default: 30 mbarg (+0, -20%).
Flow Rate: Range: 1000 or 1500 NI/min.
Default: 1500 NI/min.
Material: Housing: Stainless steel 316L.
Gasket: Neoprene.
Spark arrestor: Stainless steel mesh.
Mounting Method: Rectangular cut-out and fixing holes as per drawing.
Weight: 4 kg (8.8lb)
Indicator Colour Status
Alarm / Pressurized Red Low pressure alarm (enclosure pressure too low)
Purging Black Purge flow too low or not in purge mode