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EXPO MiniPurge D770/ET - User Manual

EXPO MiniPurge D770/ET
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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.

Table of Contents

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Summary

Section 1: System Specification

MiniPurge Control Unit Data

Details about the MiniPurge Control Unit, including type, capacity, and materials.

Vortex Cooling Assembly

Description of the cooling assembly, including its function and components.

Relief Valve Unit and Purge Outlet Valve with integral spark arrestor

Details on the relief valve and purge outlet valve, including their function and construction.

Section 2: Quick User Guide

Installation

Instructions for installing the MiniPurge system according to standards.

Operation of the System

Steps to operate the system, including indicators and purge cycle.

Section 3: Application Suitability

Materials of Construction

Lists materials used in MiniPurge systems and their environmental compatibility.

Section 4: Description and Principle of Operation

Principle of purge and pressurization

Explains the basic steps of purging and pressurizing an enclosure.

Section 5: Main Components

Air Supply Filter; Regulator

Describes the air supply filter and regulator, including pressure settings.

Logic Air Supply Regulator

Details the logic air supply regulator and its pressure setting.

Minimum Pressure Sensor

Explains the function of the minimum pressure sensor and its indicator.

Purge Flow Sensor

Describes the purge flow sensor and its role in activating the purge timer.

Intermediate Sensor

Details the intermediate sensor for early warning of pressure drops.

Electronic Purge Timer

Explains the electronic purge timer, its settings, and LED indicators.

Purge Complete Valve

Describes the function of the purge complete valve in controlling the system.

OR Gate

Explains the function of the OR Gate in the system logic.

Alarm Only Circuit (;AO)

Discusses the option to configure the system for alarm only on pressure failure.

Visual Indicators

Describes the visual indicators for system status (Alarm/Pressurized, Purging).

Power Interlock Switch

Explains the function and connection of the power interlock switch.

Alarm; Pressurized Switch

Details the alarm/pressurized switch and its remote signaling capability.

System Purging Switch (Optional)

Describes the optional system purging switch for remote status indication.

Intermediate Switch

Explains the intermediate switch activated by the intermediate sensor.

Purge Valve

Describes the purge valve that switches between purge and leakage compensation.

Purge Flow Restrictor

Details the purge flow restrictor and its adjustment requirement.

CLAPS Sensor

Explains the CLAPS sensor for monitoring enclosure pressure.

CLAPS Regulator

Describes the CLAPS regulator controlling leakage compensation flow.

Relief Valve Unit

Details the relief valve unit, its spark arrestor, and pressure relief function.

;PA Terminal Box

Explains the Ex e certified terminal box for alarm and interlock switches.

Pneumatic Vortex Cooling Assembly

Describes the pneumatic vortex cooling assembly for ambient temperature control.

Vortex Cooler Activation Thermostat

Explains the thermostat that activates the vortex cooler.

Logic Isolation Thermostat

Describes the thermostat that isolates logic supply under high ambient temperatures.

Section 6: Installation of the System

Relief Valve Unit

Instructions for mounting and maintaining the relief valve unit.

Air Supply Quality

Specifies the required quality for compressed air supply (particle, humidity, oil).

Pipe Work

Guidelines for piping connections to the purge system.

Multiple Enclosures

Information on using the system for multiple enclosures.

Provision and Installation of Alarm Devices

How to connect alarm devices and interpret indicators.

Power Supplies and their Isolation

Requirements for power supply isolation and connection.

Power Interlock Switch

Details on the power interlock switch and its function.

Exception

Notes on when power isolation by the MiniPurge system is not required.

Section 7: Commissioning

Commissioning the System

Step-by-step guide for commissioning the MiniPurge system.

Normal Operation

How to operate the system under normal conditions after commissioning.

Section 8: Maintenance of the System

General maintenance

Routine maintenance checks and intervals for the system.

Additional maintenance checks

Recommended checks to be performed every three years.

Maintenance of Electronic Timer

Procedure for replacing the electronic timer's battery pack.

Re-calibration of the Relief Valve Unit

Instructions for re-calibrating the relief valve unit.

Re-calibration of the Pressure Sensors

Steps for re-calibrating the pressure sensors.

Section 9: Fault Finding

General Information

Provides general advice for troubleshooting and contacting support.

Relief Valve opens (continuously or intermittently)

Troubleshooting for continuous or intermittent relief valve opening.

System enters purging but purge indication does not occur

Diagnosing issues where purging is active but not indicated.

System begins purging but cycles fail to complete

Troubleshooting for incomplete purge cycles.

Section 10: Recommended Spares List

Section 11: Glossary

Section 12: Drawings and Diagrams

Section 13: Certifications

EXPO MiniPurge D770/ET Specifications

General IconGeneral
BrandEXPO
ModelMiniPurge D770/ET
CategoryController
LanguageEnglish