Measuring Gas Flow; Operating Sequences; Measuring The Detector Gas Flows With A Bubble Meter - Thermo Scientific FOCUS GC Instruction Manual

Chapter 3
Gas Control

Measuring Gas Flow

The septum purge and split flows can be measured at the relevant vents located on
the top of the instrument. Detector gas flows can be measured at the detector vent.
Use a bubble flow meter or a calibrated electronic flow meter to check flows. A
built-in flow calculator, accessible by the GC keypad, helps you measure the flow
when you use a bubble flow meter.
OPERATING SEQUENCE

Measuring the Detector Gas Flows with a Bubble Meter

Materials required:
•
•
WARNING! Do not measure hydrogen together with air or oxygen. This can create an explosive
mixture. Always measure the gases separately.
1. Attach the inlet line of the flowmeter to the exit of the detector base body
2.
3. In Main Menu, move the cursor until
4. Scroll to
5. Scroll to
78
Graduated bubble flowmeter (the bulb must be half-filled with a soap
solution)
Detector base body adapter (for FID only)
using the adapter.
While holding the bubble flowmeter vertically, squeeze and release the bulb
to produce a meniscus in the bubble meter.
then press ENTER.
Time
Measured vol.
Others
TIME
V=100 F=100.0 01:00
Flowmeter volume 100
and set the volume that you wish to measure.

Measuring Gas Flow

is selected, then press ENTER.
Instruction Manual