Extech Instruments 42275 - Manual (Page 3)

V7.1 1/08 3
REC HI LOW COMM
RH%
°C
°F
Description
1. LCD display
2. Mounting hole
3. Docking station
4. Interface Cable
5. Status LEDs
6. Software CD
Displays
LCD Display
REC: Displayed while logging readings. Read the ‘Recording
Status’ section for further details.
HI and LOW: Displayed when the High or Low Alarm limit is
exceeded. See ‘Alarm Status’ below for further information.
RH%: Relative Humidity (42270 and 42275 only)
C or F: Temperature units.
COMM: Appears when Datalogger is communicating with a PC.
Recording Status Indication
Both the RED status LED and the display indicator ‘REC’ will flash every 5 seconds if the
sampling rate is set to 5 seconds or higher. If the sampling rate is set lower than 5
seconds, the indicators will flash every 1, 2, 3, or 4 seconds as programmed.
ALARM Status Indication
Both the YELLOW status LED and the display indicator ‘ALM’ will flash when the recorded
value is higher than the user programmed High Alarm value or lower than the Low Alarm
value. The Alarm status LED and the ‘ALM’ display indicator flash every 5 seconds if the
sampling rate is programmed for 5 seconds or higher. If the sampling rate is set lower than
5 seconds, the indicators will flash every 1, 2, 3, or 4 seconds as programmed.
Low Battery Indication
When the lithium battery’s voltage nears the critical operating level the LCD displays ‘LO’.
To replace the battery, refer to the Battery Replacement section of this manual.