RH350/355 V2.1 8/08
6
Support line (781) 890-7440
Technical support: Extension 200; E-mail: support@extech.com
Repair & Returns: Extension 210; E-mail: repair@extech.com
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Specifications
Function Range and Resolution Accuracy
Humidity 0.0 to 100.0% RH
±3% RH (10 to 90%)
@ 23°C
Temperature (air) -4.0 to 122.0
o
F (-20 to 50
o
C) ±1.8
o
F (±1
o
C)
Temperature (external K) -40 to 1832
o
F (-40 to 1000
o
C) ±(0.3% rdg + 1.8
o
F (1
o
C))
Display Triple LCD
Sensor Type Humidity: Precision capacitance sensor
Internal Temperature: Thermistor
External Temperature: K-Type Thermocouple
Response Time 60 seconds typical
Dew Point -90.4 to 122.0
o
F (-68 to 50
o
C) (calculated from RH and Air
temperature measurements)
Wet Bulb -6.88 to 122.0
o
F (-21.6 to 50
o
C) (calculated from RH and Air
temperature measurements)
Low Battery Indicator Yes
Overrange Indicator E2 (air) E5 (T1), E8 (T2)
Underrange Indicator E3 (air), E6 (T1), E9 (T2)
Operating Conditions -4 to 122
o
F (-20 to 50
o
C); < 99% RH non-condensing
Storage Conditions -40 to 185
o
F (-40 to 85
o
C); <99% RH non-condensing
Power Supply 4 x 1.5V ‘AAA’ batteries
Battery Life Approx. 300 hours
Dimensions / Weight 9 x 2.2 x 1.7” (230 x 57 x 44mm); 5.3 oz. (153g)
Maintenance
Cleaning and storage
1. The meter should be cleaned with a damp cloth and mild detergent when necessary.
Do not use solvents or abrasives.
2. Store the meter in an area with moderate temperature and humidity (refer to the
operating and storage range in the specifications chart earlier in this manual).
Battery Replacement
When the battery power falls low, the symbol will appear on the LCD. Replace the four (4)
1.5 ‘AAA’ batteries by removing the rear battery compartment cover and accessing the
battery compartment. Observe polarity when placing the batteries in the compartment.
Ensure that the compartment cover is securely fastened when finished.
Copyright © 2008 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
www.burntec.com
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