Thermo Fisher Scientific
Model 15
i
Instruction Manual
4-1
Chapter 4
Calibration
This chapter describes the procedures for performing a standard zero/span
calibration and a multipoint calibration of the Model 15
i
.
HCl is highly toxic and corrosive, therefore excessive caution should be
used when using this gas. All tubing should be constructed of FEP Teflon,
316 Stainless Steel, Monel, or glass. Other materials will absorb HCl or
corrode. Ensure the exhaust of the instrument is connected to a suitable
vent.
The following sections discuss the required apparatus and procedure for
calibrating the instrument:
●
“
Equipment Required
” on page
4-1
●
“
Pre-Calibration
” on page
4-2
●
“
Calibration
” on page
4-3
●
“
Periodic Zero and Span Checks
” on page
4-5
●
“
HI and LO Multi-Point Calibration
” on page
4-6
The following equipment is required to calibrate the instrument:
A cylinder of HCl in N
2
containing an appropriate concentration of HCl
suitable for the selected operating range of the analyzer under calibration is
necessary. The HCl gas cylinder should be recertified on a regular basis
determined by the local quality control program.
Calibration requires zero air that is free of contaminants which will cause a
detectable response on the HCl analyzer. The zero air should contain <0.01
ppm HCl. Since the Model 15
i
is virtually interference free, it is only
necessary to ensure that HCl has been removed.
In order to obtain an accurate dilution ratio in the dilution method used
for calibration, the flow rates must be regulated to 1%, and be measured to
an accuracy of at least 2%. The meter and controller can be two separate
Equipment
Required
HCl Concentration
Standard
Zero Air Generator
Flow Meter(s) and
Controller(s)
