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Expo-Telektron Safety Systems MiniPurge Z & Y Purge Manual ...

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<strong>Expo</strong>-<strong>Telektron</strong> <strong>Mini<strong>Purge</strong></strong> Z purge Handbook ML 307 Issue A Page 4-5<br />

4.3.2 LC- Leakage compensation<br />

Initially a high flow of protective gas is passed through the enclosure. This flow is verified<br />

and performs the purging phase of the operation. When the purging phase is completed – i.e.<br />

the purge time has elapsed - the flow of protective gas is provided via a leakage<br />

compensation valve so that it just compensates for any leakage from the pressurized<br />

enclosure in addition to maintaining its pressurization.<br />

LCV<br />

Minimum Pressure<br />

Sensor<br />

Enclosure Pressure<br />

Test Point (Plugged)<br />

<strong>Purge</strong> Flow Sensor<br />

Flow Sensor Connection<br />

Enclosure Pressure<br />

Figure 3: Leakage Compensation circuit (Drg ref:-XBR-7TD0-016)<br />

C:\Main System Files\Marketing\Memo\ML307 ISSUE A.doc<br />

Purging<br />

Indicator<br />

Yellow = <strong>Purge</strong> Flow OK<br />

<strong>Purge</strong> time controlled manually<br />

By the operator<br />

<strong>Purge</strong> Outlet to Pressurized Enclosure<br />

Minimum<br />

Pressure<br />

Indicator<br />

I.S Switch<br />

(I.S Option only)<br />

<strong>Purge</strong> Supply<br />

Air or Inert Gas<br />

60-115 PSI<br />

4 – 8 Bar<br />

Red = Alarm<br />

Green = Pressure OK<br />

Alarm/Pressurized Output<br />

Signal @ Supply Pressure<br />

(PO Option only)<br />

<strong>Purge</strong> Control<br />

Valve<br />

1 Common<br />

4 Pressurized<br />

2 Alarm<br />

Page 4-5

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