Extech RH401 Data Sheet

Specifications subject to change without notice.
Copyright © 2007-2008 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.

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8/08/08 - R1

Humidity, Wet bulb, Dew Point and Air Temperature

Plus IR for non-contact surface Temperature measurements

Digital Psychrometer + InfraRed Thermometer

Ordering Information:

RH401 ..........................Digital Psychrometer + InfraRed Thermometer

RH401-NIST ................Digital Psychrometer + InfraRed Thermometer w/ NIST Certificate

RH405 ..........................Digital Psychrometer + InfraRed Thermometer Kit

RH405-NIST ................Digital Psychrometer + InfraRed Thermometer Kit w/NIST Certificate

RH401-CAL ..................33% and 75% RH calibration reference

407752 ........................RS-232 PC cable and software for RH401

Features:

• Triple display with backlighting

View Air temp+RH+surface temp
View Dew Point+RH+surface temp
View Wet Bulb+RH+surface temp

• InfraRed Thermometer with

Built-in laser pointer
8:1 distance to target ratio
Adjustable Emissivity from 0.3 to 1.0

• Precision humidity capacitance sensor is retractable for

protection during transportation and storage

• Calculates T1 (IR Surface Temperature) - DP (Dew Point) differential

• Programmable Auto power off and Low battery indication

• Over-range/under-range alert indicator

• Built-in RS-232 interface for capturing readings on a PC

• RH401 complete with 4 AAA batteries and carrying case

• Optional RH405 kit includes meter, 33% and 75%

calibration bottles, RS-232 cable, 4 AAA batteries and
carrying case

Applications:

• Monitor Wet Bulb, Dew Point, Relative Humidity and

Temperature in factories, clean rooms, offices, and greenhouses

• Non-contact InfraRed surface temperature measurements in

hard to reach areas such as heating and air conditioning duct

• Humdity monitoring in schools, offices and

manufacturing or storage areas

Specifications: Range Max Resolution Basic Accuracy

Humidity 10 to 90%RH 0.1% RH ±3% RH
Temperature (internal) -4 to 122°F (-20 to 50°C) 0.1° ±1.8°F or ±1°C
Temperature (external) -328 to 2498°F (-200 to 1370°C) 0.1° ±0.3% or ±1.8°F/±1°C
Dew Point -90.4 to 122°F (-68.0 to 49.9°C)
Wet Bulb -6.9 to 122°F (-21.6 to 49.9°C)
Dimensions 9 x 2.2 x 1.7" (230 x 57 x 44mm)
Weight 5.3oz (153g)

RH405 Digital Psychrometer + InfraRed
Thermometer Kit includes calibration
bottles, RS232 cable, and carrying case.