RH520 Datasheet, PDF (11/15 Pages) Extech Instruments Corporation. – Humidity-Temperature Chart Recorder

MAX-MIN DISPLAYS
1. Press the VIEW button in the Standard View to display the highest (MAX) and lowest
(MIN) temperature and RH readings from all of the stored measurement records.
2. When viewing the
highest readings,
the MAX indicator
will switch on.
When viewing the
lowest readings,
the MIN icon will
switch on.
MAX or MIN indicator
is ON when in the
MAX or MIN mode
3. The cursor will
move to the
location of the
MIN or MAX
reading within the graph. If not within the graph currently displayed, the cursor will
move to the right-most position and the graph will shift accordingly so that the relevant
data point can be viewed.
4. Use the VIEW button to step through the highest and lowest temperature readings and
then the highest and lowest RH readings. When the MAX or MIN indicator is ON under
the temperature reading digits, the display is showing the MAX or MIN temperature.
When the MAX or MIN indicator is ON under the RH reading digits, the display is
showing the MAX or MIN relative humidity.
ALARM DISPLAYS
1. Press the ALARM button from the Standard View to analyze the most recent alarm
activity (temperature or humidity), if any. The ALARM display icon and the relevant
upper (temperature) or lower (RH) graph pixel will flash.
2. The cursor will move to the location within the graph. If not within the graph currently
displayed, the cursor will move to the right-most position and the graph will shift
accordingly so that the relevant data point can be viewed.
3. Press the ALARM button again to view the second most recent set of Alarms (if no
alarms, the Standard View will appear)
4. Press the ALARM button again to view the third most recent set of Alarms (if no
alarms, the Standard View will appear)
5. This procedure can continue until no further alarms exist and pressing the ALARM
button will only bring up the Standard View
6. In the example diagram, the RH520 is showing a high temperature alarm (MAX and
ALARM indicators on).
MAX Temperature
Alarm Mode
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RH520 V2.9 3/07