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1,3-BUTADIENE: METHOD 1024, Issue 2, dated 15 August 1994 - Page 8 of 8

“B” Filter

“B” Flow control

Carrier inlet

Needle valve

“B” Septum purge

“B” Backpressure regulator

“B” Split vent

“C” Flow control

Carrier inlet

“C” Backpressure regulator

“C” Split vent

VALVES ON “B” Injection port

Cap

Pre-column

“B” Solenoid valve NO

COM

NC “C” Solenoid NC valve NO

COM

“C” Filter

Analytical column FID

Figure 1. Flow diagram for pre-column system in inject mode.

“B” Filter

“B” Flow control

Carrier inlet

Needle valve

“B” Septum purge

“B” Backpressure regulator

“B” Split vent

“C” Flow control

Carrier inlet

“C” Backpressure regulator

“C” Split vent

VALVES OFF “B” Injection port

Cap

Pre-column

“B” Solenoid valve NO

COM

NC “C” Solenoid NC valve NO

COM

“C” Filter

Analytical column FID

Figure 2. Flow diagram for pre-column system in backflush (normal) mode.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition

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