Reducing Consumption During or After Analysis

The following describes methods for reducing helium gas consumption during or after analysis.

 Description of Carrier Gas Saver Mode

 How to Configure Settings for GC-2010, GC-2014, and GC-2025 Systems
 * Nexis GC-2030 settings do not need to be configured.

Reducing Consumption During Analysis (Carrier Gas Saver Mode)

For split analysis, a large split ratio does not need to be maintained after the sample enters the column. The following describes the carrier gas saver mode, which reduces gas consumption by changing the split ratio after the sample enters the column.

Carrier Gas Saver Mode

The carrier gas saver function can be used to reduce the split flowrate at a specified time after analysis starts until the next analysis starts.

Systems equipped standard with the carrier gas saver mode: Nexis GC-2030, GC-2010 series, GC-2025, and GC-2014 series

 

Reduces the split flowrate from 200 mL to 20 mL one minute after the sample is injected. By also using an auto injector, the split flowrate can be kept at the saver level from after analysis ends until analysis starts the next day. Given the following conditions, the saver mode reduces helium consumption per analysis by about 83 %.
Analysis time: 30 min
Split ratio: 100
Carrier gas saver function: Split ratio of 10 after one minute

[Caution]
Specify a split ratio setting during the carrier gas saver mode that results in a total flowrate of at least 20 mL/min (at least 30 mL/min, if possible).

Reducing Consumption After Analysis

For GC-2010 series, GC-2014 series, or GC-2025 models, helium gas consumption can be kept in the saver mode even after analyses have ended by specifying the gas saver function on the main GC unit. Even more helium gas can be saved by using the function in combination with the carrier gas saver mode.

* Nexis GC-2030 settings do not need to be configured.

 

How to Configure Settings

Using an Auto Injector
  1. In the screen displayed by pressing the [FUNC] key on the main GC unit, select [6.System Configuration] and then [9.Other Configurations].
  2. Set [Gas Saver AOC link] to [Yes].

* Only displayed if an AOC line is selected. This function is only enabled if the gas saver function is ON and batch analysis is performed using an AOC auto injector.

* Do not specify the [Gas Saver auto on (min)] setting if the [Gas Saver AOC link] setting is specified on the main GC unit.

Using Manual Injection
  1. In the screen displayed by pressing the [FUNC] key on the main GC unit, select [6.System Configuration] and then [9.Other Configurations].
  2. Set [Gas Saver auto on (min)] to [10 to 120 (min)].

* Do not specify the [Gas Saver AOC link] setting if the [Gas Saver auto on (min)] setting is specified.

Use of Auto Injector [Gas Saver AOC link]
(X in right figure)
[Gas Saver auto on (min)]
(YYY in right figure)
Yes Yes 0
No No 10 to 120

[Other Configurations] Setting on GC Unit
(GC-2010 Plus example shown)


Screen with [Other Configurations] Displayed
(GC-2010 Plus)

For Research Use Only. Not for use in diagnostic procedures.

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