Kahn HygroPort I.S., User Manual, Page: 28 / 70

HygroPort I.S. User’s Manual
External Sensor Interface
ONLY an Easidew I.S. Transmitter should be connected if the
HygroPort I.S. is to be used in a hazardous area. The Easidew
I.S. must be connected using the I.S. barriers required by CE-
ATEX, FM, or CSA certification. A Kahn Remote Sensor
Interface module is also required.
Highlight EXTERNAL from the Main Menu
by using a combination of the scroll up and
scroll down keys and press the Enter key. The

External Set-Up Menu, is then displayed, see
Figure 2.11.
Initially the EXTERNAL TYPE field is
highlighted. This field is used to select a
Kahn Easidew I.S. Transmitter.
To enter the parameter value field press the
Enter key. The current setting i.e. NONE, is
then highlighted and can be changed. Use
either the scroll up or scroll down keys to
select EASIDEW and then press the Enter key.
Figure 2.11 illustrates the selection of an
Easidew I.S. transmitter. NOTE: The ZERO
and SPAN limits are automatically added
for this transmitter.
Use the scroll up and scroll down keys to
select each parameter that needs to be
entered in turn and press the Enter key.
A user pressure can also be selected. This
pressure is used in the calculation of dew
point at pressure, moisture content and
Table 2.6 details the field values. To quit, press the scroll left key.
Parameter variable options
Defines use of Easidew I.S. transmitter.
ZERO
and
SPAN
(fullscale)
default limits are pre-programmed but can be redefined
Defines external zero (lower limit). The
ZERO
default limit is pre-
programmed but can be redefined
Defines external span (upper limit). The SPAN (full scale) default
limit is pre-programmed but can be redefined
Range 0-5000 psig (or equivalent in other units). Used to define
system pressure, for use in calculating moisture parameters
Table 2.6 External transmitter selection
Issue 6, December 2019 17 Kahn Instruments
2.6.4
!
EXTERNAL TYPE NONE EXTERNAL
EXTERNAL ZERO N/A
EXTERNAL SPAN N/A
USER PRESSURE ATM Psig
EXTERNAL TYPE NONE EXTERNAL
EXTERNAL ZERO N/A
EXTERNAL SPAN N/A
USER PRESSURE ATM Psig
EXTERNAL TYPE EASIDEW EXTERNAL
EXTERNAL ZERO -100 °C
EXTERNAL SPAN 20 °C
USER PRESSURE ATM Psig
EXTERNAL TYPE EASIDEW EXTERNAL
EXTERNAL ZERO -100 °C
EXTERNAL SPAN 20 °C
USER PRESSURE ATM Psig
Figure 2.11 External transmitter
absolute humidity. If a user pressure is not
selected then HygroPort I.S. assumes atmospheric pressure.
Parameter
EXTERNAL
TYPE
EXTERNAL
ZERO
EXTERNAL
SPAN
USER
PRESSURE