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Emerson Process Management GmbH & Co. OHG
4-16
X-STREAM XEFD
Instruction Manual
HASXEDE-IM-EX
07/2017
Zero C
alibration..
Span C
alibration..
Advanced C
alibration..
Apply Gas..
Lock M
enus!
Acknowledgements
Pump 1:
On
Pump 2:
Off
Ranges..
4.4 Manual Calibration
4.4.3 Manual Calibration for Vapor Recovery Applications
1. The measurement system
for this applications includes a
converter, therefore calibration
span gas must contain oxygen
for the converter to work prop-
erly.
2. During channel 1 calibra-
tions, the calibration gas must
go through the converter. There-
fore, before starting calibra-
tions, ensure
“Pump 1”
within
the control menu is set to ON.
Note!
“Pump 1”
is used to disable (
Off
) or enable
(
On
) the gas flow through the converter!
Recommended specification of calibration
gases:
•
Zero gases for both channels:
Nitrogen or air, free of hydrocarbons
• Span gas for channel 1:
CH
4
in air, concentration should be about
90
…
100 % of measuring range
• Span gas for channel 2:
Suitable hydrocarbons (C
n
H
m
) in air, con-
centration should be about 90
…
100 % of
measuring range.
Perform the zero and span calibrations fol
-
lowing the procedures described in sections
4.4.1 and 4.4.2.