Zero And Span Check; Calibrate High So 2 , H S, And Cs - Thermo Scientific 450iQ Instruction Manual

Calibrate Low SO
H
Calibrate High SO
H
Zero and Span
Thermo Scientific
,
Follow the Calibrate SO
2
"Calibration in Single Range
S, and CS
2
Span Coefficient to calibrate the low SO
calibration gas, Calibrate Low CS Span Coefficient to calibrate the low
CS channel to the low CS calibration gas, and Calibrate Low H
Coefficient to calibrate the low H
gas.
Note The low channels should be calibrated first and then the high
channels, due to conditioning of the measurement system with SO
,
Follow the "Calibrate SO
2
"Calibration in Single Range
S, and CS
2
Span Coefficient to calibrate the high SO
calibration gas, Calibrate High CS Span Coefficient to calibrate the high
CS channel to the high CS calibration gas, Calibrate High H
Coefficient to calibrate the high H
gas.
The zero and span check procedure is normally performed any time a quick
check of the accuracy of the instrument is required. Normally, zero and
Check
span are checked daily. As experience is gained with the instrument, the
frequency of these checks can be adjusted accordingly.
The span gas concentration used in the span check should be between 70%
and 90% of the full-scale range. The zero and span drift should be
measured and recorded prior to making any adjustments.
All gas must be supplied to the instrument at atmospheric pressure. It will
be necessary to employ an atmospheric bypass plumbing arrangement to
accomplish this.
If a filter is used, all gas must enter the instrument through the filter.
Use the following procedure to check the zero/span.
1. If the instrument is equipped with the optional zero/span and sample
Note Do not use nitrogen for zero air.
2
valves, connect the zero and span gas to the rear panel bulkheads
labeled ZERO IN and SPAN, otherwise connect a source of vented
zero air to the SAMPLE bulkhead.
, H S and CS procedures described previously in
2
Mode" selecting Calibrate Low Range SO
channel to the low SO
2
S channel to the low H
2
, H S and CS procedures described previously in
2 2
Mode" selecting Calibrate High Range SO
channel to the high SO
2
S channel to the high H
2
L
Calibration

Zero and Span Check

2
2
S
2
S calibration
2
.
L
2
2
2
S
2
S calibration
2
4-11
450iQ Instruction Manual