PST MICHELL Instruments MDM300, User Manual, Page: 23 / 70

MDM300 User Manual
Michell Instruments 15
INSTALLATION
2.6.2 Set-Up External Temperature Transmitter Parameters
After adding a temperature transmitter, the following parameters must be defined.
Switch on the instrument and initially set the required
DP/TEMP
units to either
°C, °F
or K
from the Settings Menu (refer to Section 3.4.1).
Using the
EXTERNAL
option from the SET-UP Menu, set-up the instrument for an
external temperature transmitter input as follows (refer to Section 3.4.4).
EXTERNAL TYPE Select TEMP
EXTERNAL ZERO
Enter Zero point (temperature represented by 4 mA input)
EXTERNAL SPAN Enter Span (maximum temperature represented by 20 mA input)
After completion of the above settings, return to the Main Display and the instrument
will now display temperature in the secondary display area and the selected units.
An example is shown below:
Dewpoint External
°C
12.7
6.9
°C Temp
Figure 11 Typical External Temperature Display
The measured temperature will be used to calculate Relative Humidity.
2.6.3 Set-Up External Dp (Easidew) Transmitter Parameters
After adding an external dew-point transmitter, the following parameters must be
defined. Switch on the instrument and initially set the required
DP/TEMP
units to either
°C, °F
or K from the Settings Menu (refer to Section 3.4.1).
Using the
EXTERNAL
option from the SET-UP Menu, set-up the instrument for an
Easidew transmitter input as follows (refer to Section 3.4.4).
EXTERNAL TYPE
Select
EASIDEW
EXTERNAL ZERO -100 °C ( DP TEMP represented by 4 mA input - can be reset)
EXTERNAL SPAN
20 °C (
DP TEMP
represented by 20 mA input - can be reset)
After completion of the above settings, return to the Main Display and the instrument
will now display pressure in the secondary display area and the selected units.
An example is shown below:
Calc dp at pressure External
°C
-25.7
-26.9
°C dp
Figure 12 Typical External Dew-Point Display