Extech Instruments RHT30 User Manual page 7

 Alarm Delay
The preset alarm delay time for the Single Event Alarm mode is always zero.
The adjustable delay time range for the Cumulative Alarm is 5 ~ 120 minutes.
 Alarm Modes
Single Event Alarm mode: The LED immediately starts flashing red every 10
seconds when the measured value exceeds the alarm threshold.
Cumulative Alarm mode: The LED begins flashing red only after the average
value exceeds the alarm threshold and also after any programmed Alarm
Delay time. See Alarm Delay parameter above.
Alarm Disable (default): Alarm function disabled.
Alarm Note: The LED will continue flashing red every 10 seconds (once it is
triggered by an alarm) even when the measurement later returns to the
normal range. To stop the LED alarm, plug the logger into the PC USB port to
generate a report, or power off the logger (short press of the power button
while it is not connected to the PC).
 Alarm Limits
Select the alarm threshold ranges for air and external probe temperature
(TH30) or air temperature and RH% (RHT30). For example, if the external
probe temperature range is set to 2.0~8.0
below 2
Note: If an alarm occurs between two logging points, the logged data will not
show the alarm but the LED may still flash red every 10 seconds, especially in
Single Event alarm mode. If desired, use the Cumulative Alarm mode to
minimize this effect.
 Password
A 16 alphanumeric character (max.) password may be used to prevent
unauthorized re‐programming.
 User Company Name
Input a company name to be included on the log report (20 characters max.).
 A Note On Time Zones
The logger automatically synchronizes the time zone with the connected PC
when 'SAVE' is selected. Note: Time zone changes occurring during logging are
not taken into account.
Once all the programming is complete, press 'SAVE' to confirm the settings. Close the
setup window, remove the logger from the PC USB port, and start datalogging as
described in the next section.
888.610.7664
o o
C or exceeds 8 C the LED will flash red every 10 seconds.
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15
10 20
5 25
0 30
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C, when the measurement falls
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RHT30_TH30‐en‐GB_V1.0 (11/16)
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