Table of Contents
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®
D758/ET MiniPurge
Manual
ML434
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.
ML434 | v36
15-Nov-19
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Table of Contents
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Summary of Contents for EXPO ML434
- Page 1 Manual ML434 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.
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Page 3: Table Of Contents
Section 1: System Specification ....................1 ® MiniPurge Control Unit Data....................2 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 .....................8 Air Supply Filter / Regulator......................8 Logic Air Supply Regulator .......................8... -
Page 4: Section 1: System Specification
For limitations and conditions of use refer to the applicable certificates. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 5: Minipurge ® Control Unit Data
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%). ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 6: Relief Valve Unit And Purge Outlet Valve With Integral Spark Arrestor
7 kg (15.4 lb). Note: Special settings available on request, refer to Test and Inspection Sheet. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 7: Section 2: Quick User Guide
Yellow On completion of an uninterrupted purge cycle of the required length, the system will indicate purge complete. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... - Page 8 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. ML434 | v36 Page...
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Page 9: Section 3: Application Suitability
® 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... -
Page 10: Section 4: Description And Principle Of Operation
This system has been specifically designed to maintain a stable internal pressure within the enclosure. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011... -
Page 11: Section 5: Main Components
This sensor is factory calibrated to operate on falling flow rate at or above the minimum specified purge flow rate. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011... -
Page 12: Intermediate Sensor
Warning: It is potentially dangerous to energise the pressurized enclosure in an non-pressurized condition when it is known that there is potentially explosive gas or dust in the hazardous location. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011... -
Page 13: Visual Indicators
This valve restricts the purge flow to the minimum required flow rate. The Purge Flow Restrictor must be readjusted during commissioning. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011... -
Page 14: Claps Sensor
® The MiniPurge 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 MiniPurge system must be installed by a competent person in accordance with relevant standards, such as IEC / EN 60079-14, and any local codes of practice. -
Page 15: Air Supply Quality
This pipe work must be fitted in accordance with local codes of practice where relevant. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 16: Multiple Enclosures
Power to apparatus that is already suitable for use in hazardous locations need not be isolated by the ® MiniPurge system. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 17: Section 7: Commissioning
• The flashing yellow indicator confirms the correct flow rate. • The differential pressure should be greater than 6.4 mbarg. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 18: Normal Operation
After this, the purge and pressurization sequence is automatic. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 19: Section 8: Maintenance Of The System
To adjust the lift off pressure of the Relief Valve: • Attach test equipment as described in the Commissioning Section. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 20: Re-Calibration Of The Pressure Sensors
• Turn clockwise to reduce the pressure setting and anti-clockwise to increase. • Replace sensor, screwing clockwise. • Reconnect all pipe work. ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 21: Section 9: Fault Finding
General Information If you are having problems that cannot be corrected using one of the methods described, please call Expo or your supplier for further assistance. If the system is less than 12 months old, parts under warranty should be returned to Expo for investigation. -
Page 22: Relief Valve Opens (Continuously Or Intermittently)
The intrinsically safe battery pack • Replace as necessary . is discharged ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... -
Page 23: Section 10: Recommended Spares List
X LC Sequence Diagram XBR-7TD0-040 MiniPurge System Status Indication TP-518-058-WD ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com E:sales.na@expoworldwide.com... -
Page 24: Section 13: Certifications
IECEx EPS 14.0092X Ex d limit switch EPS 14 ATEX 1766 X ML434 | v36 Page Expo Technologies UK Expo Technologies US Expo Technologies China T: +44 (0) 20 8398 8011 T: +1 (440) 247 5314 T: +86 532 8906 9858 E: sales@expoworldwide.com... - Page 37 [This Page Intentionally Left Blank] ...
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- Page 40 Expo Technologies USA Expo Technologies UK Expo Technologies China Expo Technologies Inc. Expo Technologies Ltd. Qingdao Expo M&E Technologies Co. Ltd 9140 Ravenna Road Unit #3 Unit 2 The Summit, Hanworth Road 329 Huashan Er Lu Sunbury-On-Thames, Jimo City, Qingdao,...
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