Extech Instruments RHT10 User Manual page 3

LED Status Guide
LED Status
REC ALM
REC ALM
REC ALM
REC ALM
* To save power, the logger's LED flashing-cycle can be changed to 20s or 30s via the supplied software.
** To save power, alarm LEDs for temperature and humidity can be disabled via the supplied software.
***When both temperature and relative humidity readings exceed alarm level
alternate every cycle.
****When the battery is low, all operations will be disabled
the battery weakens (logged data will be retained). The supplied software is required to restart logging and to
download logged data.
Indication
Both LED lights OFF
Logging not active
Low Battery
One green flash every 10 sec. *
Logging active, no alarm condition**
Green double flash every 10 sec.
Delayed start
Red single flash every 10 sec. *
Logging active, low alarm condition for RH***
Red double flash every 10 sec. *
Logging active, high alarm condition for RH***
Red single flash every 60 sec.
Low Battery****
Yellow single flash every 10 sec. *
Logging active, low alarm condition for TEMP***
Yellow double flash every 10 sec. *
Logging active, high alarm condition for TEMP***
Yellow single flash every 60 sec.
Logger memory full
Or
automatically. NOTE: Logging automatically stops when
User Manual for Model RHT10 Version 1.3 March 2007
3
Action
Start logging
Replace battery and
download the data
To start, hold the start
button until Green and
Yellow LED flash
If logging, logger will stop
automatically. No data will
be lost. Replace battery
Download the data
synchronously, LED status indication