2.12 Display Operation; Upper Display - Michell Instruments 4000 Series User Manual

SERIES 4000 Precision Dewpointmeter (Remote, Climatic, RS and TRS)Users Guide
Momentary pressing of the MAX COOL button should cause a dip in the
mirror temperature, which, upon release of the button, will provoke the mirror
temperature into oscillation around the dew-point value. After a few minutes
the mirror should return to its original stable temperature. If this does not
happen it may be necessary to consider improving the method of sensor
cooling.

2.12 Display Operation

There are two six digit 7-segment L.E.D. displays on the front panel of the monitor
unit. These can be configured to display a number of measured and calculated
parameters.
Note that all parameters listed in Section 4.6.1. and 4.6.2. are available on the
analogue and RS232 outputs, regardless of which are displayed at any time.
During operation, if % rh is selected, the lower display will automatically display the
sample gas temperature. The display is configured such that two "calculated"
parameters cannot be displayed at any time.
Note that the operation of the display depends on whether the remote temperature
probe is connected. If the probe is not fitted, remote temperature and % rh is not
displayed and °C/°F mode is selected by the upper "UNIT SELECT" push button.
2.12.1

Upper Display

When the instrument is initially switched ON, the measured dew point in degrees
Celsius (°C) is displayed on the upper display. The two-digit annunciator, between
the upper "UNIT SELECT" push button and the upper display will display "C"
indicating °Cdp.
If the remote temperature probe is fitted, by pressing the upper "UNIT SELECT"
push button the upper display may be toggled between measured dew point (°C) and
Relative Humidity (% rh). The two-digit annunciator, between the upper "UNIT
SELECT" push button and the upper display will display "rh" indicating % rh.
If the remote temperature probe is not fitted, by pressing the upper "UNIT SELECT"
push button, the upper display may be toggled between measured dew point in °C
and °F. The two digit annunciator will display "F" indicating degrees Fahrenheit.
The "UNIT SELECT" switch will scroll through the functions as follows:
Upper Display :
C - °Cdp
rh - % rh
Notes:
1. If the display is configured to °F mode (by means of the lower display),
then the upper display will toggle between % rh and °Fdp.
2. When % rh is selected on the upper display, the lower display
automatically displays Sample Gas Temperature either in °C or °F.
% rh Mode
or
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Dew point only Mode
C - °Cdp
F - °Fdp
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