Servomex Xentra 4900 User Manual

2.21
Table 2.10 Recommended calibration gases
Gas Components
Measured
Calibration gas 1 Calibration gas 2
CO only or CO+O
2
“zero grade” N
2
*
CO in air gas mix
NO only or NO+O
2
NO in N
2
gas mix Air
SO
2
only or SO
2
+O
2
“zero grade” N
2
*
SO
2
in air gas mix
CO+NO or
CO+NO+O
2
NO in N
2
gas mix CO in air gas mix
CO+SO
2
or CO+SO
2
+O
2
“zero grade” N
2
*
CO, SO
2
in air gas mix
NO+SO
2
or NO+SO
2
+O
2
NO in N
2
gas mix SO
2
in air gas mix
* Zero grade nitrogen is 99.998% purity with total impurities not exceeding 20
vpm.
Table 2.11 Recommended component concentrations
Gas Measured Recommended
calibration level
Paramagnetic O
2
21%
Gfx High sensitivity CO (0-50 to 0-500 vpm) 50 vpm
Gfx Standard sensitivity CO (0-200 to 0-3000 vpm) 200 vpm
Gfx NO (0-100 to 0-500 vpm) 100 vpm
Gfx High sensitivity SO
2
(0-100 to 0-500 vpm) 100 vpm
Gfx Standard sensitivity SO
2
500 vpm
The accuracy of the calibration materials used with the analyser is an important
contribution to the quality of the data measured. Servomex recommend that the
xentra 4900 Continuous Emissions Analyser be calibrated using certified gravimetric
gas mixtures from a reputable supplier. These should be accompanied by a
compositional analysis certificate of certified accuracy . Pressure regulators used
with the calibration gas mixtures should be good quality two stage regulators
compatible with the gas composition. The calibration gas supply pressure will be in
the range 1-5 psig. The pressure regulators should provide a stable delivery
pressure of 0-10 psig ( 0-1 bar ) at a standard flow rate of up to 2l/minute.
WARNING
The sample and calibration gases supplied to the instrument may be
toxic. Verify that connections are leak free at full operating pressure
before proceeding to admit toxic gases.

Servomex Xentra 4900 Specifications

General

Brand	Servomex
Model	Xentra 4900
Category	Analytical Instruments
Language	English