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Maintenance
Battery Replacement
The battery compartment is located on the back of the datalogger as shown in the
Descriptions section. When the battery symbol flashes on the display, replace the
batteries promptly.
1. Using a large coin, rotate the battery compartment lid clockwise approximately
one quarter turn to open the compartment
2. Replace the two (2) CR2032 batteries with positive (+) side facing up
3. Replace the battery compartment lid and turn counterclockwise to secure it
4. Dispose of batteries in accordance with country, state, and local regulations
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end‐of‐
life devices to a designated collection point for the disposal of electrical and electronic equipment.
Battery Status Check
To check the approximate number of days of battery life remaining, short press the
MARK button. The display will show the number of days and the 'd' for days (XXd).
Cleaning
Wipe the datalogger with a damp cloth, do not use solvents or abrasives as these may
damage the datalogger finish and display lens.
Error Display Codes
ERROR
Dashes
‐ ‐ ‐ ‐ ‐ . ‐
E02
E03
E04
E11
E31
E33
888.610.7664
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection
sites, the retail store where the batteries were purchased, or wherever batteries are sold.
CAUSE
External probe unplugged (TH30 only)
Measured value below specified range
Measured value above specified range
Temperature error (RHT30 only)
Humidity check failed (RHT30 only)
Microprocessor failed
Humidity measurement error
www.calcert.com
15
10
20
5
25
0
30
SOLUTION
Check the connection between
the external probe and logger
Operate in the specified range
Operate in the specified range
Contact Extech for service
Contact Extech for service
Contact Extech for service
Contact Extech for service
10
RHT30_TH30‐en‐GB_V1.0 (11/16)
sales@calcert.co
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