OPERATION MULTI GAUGE CONTROLLER
3.6.4 READINGS CORRECTION OF GAS TYPE - GAS TYPE MENU
Setup menu →Gas type
As a standard, gauges are calibrated for measurements in nitrogen or air. If pressure measurements
are carried out with other gases, readings can be corrected. The Gas Type parameter is used to set
correction factor for a given gas type.
For passive gauges correct readings of pressure are achieved by dividing the readings by the cor-
rection factor according to the following formula:
𝑃 =
𝐼
𝑆
⋅ 𝐼
𝑆
= 𝑆
⋅ 𝑅
where:
𝑃 - pressure
𝐼
- ion current, see ig. 3.40
𝑆
- sensitivity factor for a given gas g
𝐼
- emission current, see ig. 3.40
𝑆
- gauge sensitivity for 𝑁
𝑅
- gas correction factor
Correction, due to the gas type, becomes pressure function if pressure exceeds 0.5 mbar. This fact
has been taken into account for all gas types available for the MG15 .
The correction factors for Bayard Alpert gauges implemented in the MG15 are listed in table 3.2.
GAS 𝑅
𝐻𝑒 0.18
𝑁𝑒 0.30
𝐻
0.46
𝐴𝑖𝑟 1.00
𝑂
1.01
𝐶𝑂 1.05
𝐴𝑟 1.29
𝐾𝑟 1.94
𝑋𝑒 2.87
𝐷𝐸𝐹𝐼𝑁𝐸 0.01-9.99
Table 3.2: Correction factors for Bayard Alpert gaugest
Page 66 User manual rev. 03
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