RH401 V1.5 8/08

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DP

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Introduction

Congratulations on your purchase of the Extech RH401 Digital Psychrometer + InfraRed

Thermometer. This device measures Humidity, Air Temperature, Dew Point and Wet Bulb.

Advanced features include Infrared Non-Contact Surface Temperature Measurement, Data

Hold and programmable Auto Power Off, and an RS-232 interface for capturing readings to

a PC using optional 407752 software. The retractable probe protects the sensors when the

meter is not in use. Careful use of this meter will provide years of reliable service.

Meter Description

1.

Emissivity adjust indicator

2.

Laser pointer on indicator

3.

Low Battery indicator

4.

IR Surface Temperature button

5.

ON/OFF/Setup button

6.

Back Light button

7.

Laser/Down button

8.

°F/°C/Up button

9.

Dew Point/Wet Bulb button

10. % Humidity display

11. Air Temperature, Dew Point or Wet Bulb display

12. IR Surface Temperature display

13. Extended probe with Humidity &

Air Temperature Sensors

14. PC interface port

15. AC adaptor jack

Note: The battery compartment is located on the rear of the instrument

Warranty

EXTECH INSTRUMENTS CORPORATION

(A FLIR COMPANY) warrants this instrument to

be free of defects in parts and workmanship for one year from date of shipment (a six

month limited warranty applies to sensors and cables). If it should become necessary to

return the instrument for service during or beyond the warranty period, contact the

Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our

website www.extech.com for contact information. A Return Authorization (RA) number

must be issued before any product is returned to Extech. The sender is responsible for

shipping charges, freight, insurance and proper packaging to prevent damage in transit.

This warranty does not apply to defects resulting from action of the user such as misuse,

improper wiring, operation outside of specification, improper maintenance or repair, or

unauthorized modification. Extech specifically disclaims any implied warranties or

merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,

incidental or consequential damages. Extech's total liability is limited to repair or

replacement of the product. The warranty set forth above is inclusive and no other

warranty, whether written or oral, is expressed or implied.