HygroPort I.S. User’s Manual
Calibration Method
WARNING:
These procedures require the use of specialized test
equipment and calibration adjustments should only
be carried out by qualified personnel. If not correctly
carried out, the instrument’s calibration can be lost.
The calibration procedure for the instrument is as follows:
1.
Turn on the instrument, allow the initialization period to complete and allow
sufficient time for it to stabilize.
2.
Insure the instrument is set up with sample gas as
AIR
and operating pressure as
ATMOS
.
3.
Insure that the temperature units are set up as
°C
and the primary display is
reading
Dewpoint
.
4.
Insure that all sample tubing and connectors are made from stainless steel and are
of suitable quality. Remove the sintered filter from the inlet of the HygroPort I.S.
5.
Connect the HygroPort I.S. to a dewpoint generator and establish a gas flow
through the instrument.
6.
Apply a dewpoint of -100°C and allow the instrument’s reading to stabilize for a
minimum of 96 hours (including dry down).
Measurement OK
must be displayed
in the status line when readings are taken.
7.
Record the applied REF dewpoint and the corresponding HygroPort I.S. display reading.
8.
Repeat steps 5 and 6 at all the required dewpoint values over the operating range
of the instrument, as shown in Table 6.1, allowing the stabilization times shown
before recording consecutive readings.
A set of results similar, for example, to that shown in Table 6.1 could be generated over the
calibration range of the instrument.
DP REF
Stabilize HygroPort I.S.
DP REF
Stabilize
HygroPort I.S.
°C
Time
Rdg
°C
Time
Rdg
(Hours)
°C
(Hours)
°C
-100
96
-99.8
-30
1
-30.1
-80
12
-79.7
-20
1
-19.9
-70
8
-70
-10
1
-10
-60
4
-59.8
0
1
0.1
-50
2
-49.8
10
1
10
-40
1
-39.9
20
1
20
Table 7.1
Example of calibration run readings
Issue 6, December 2019
44
Kahn Instruments
7.2
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