English Datasheet

Digital Psychrometer + InfraRed Thermometer
Humidity, Wet bulb, Dew Point and Air Temperature
Plus IR for non-contact surface Temperature measurements
• 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
• 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
RH405 Digital Psychrometer + InfraRed
Thermometer Kit includes calibration
bottles, RS232 cable, and carrying case.
Temperature (internal)
Temperature (external)
Dew Point
Wet Bulb
10 to 90%RH
-4 to 122°F (-20 to 50°C)
-328 to 2498°F (-200 to 1370°C)
-90.4 to 122°F (-68.0 to 49.9°C)
-6.9 to 122°F (-21.6 to 49.9°C)
9 x 2.2 x 1.7" (230 x 57 x 44mm)
5.3oz (153g)
Max Resolution
0.1% RH
Basic Accuracy
±3% RH
±1.8°F or ±1°C
±0.3% or ±1.8°F/±1°C
Ordering Information:
RH401 ..........................Digital Psychrometer + InfraRed Thermometer
RH405 ..........................Digital Psychrometer + InfraRed Thermometer Kit
RH401-CAL ..................33% and 75% RH calibration reference
407752 ........................RS-232 PC cable and software for RH401
Specifications subject to change without notice.
7/27/09 - R1
Copyright © 2007-2008 Extech Instruments Corporation. All rights reserved including the right of reproduction in whole or in part in any form.