User Guide

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
Digital Psychrometer + InfraRed Thermometer
Humidity, Wet bulb, Dew Point, Air Temperature plus IR for Non-contact Temperature measurements
Ordering Information:
RH401 ..............Digital Psychrometer + InfraRed Thermometer
RH401-NIST ....Digital Psychrometer + InfraRed Thermometer w/NIST Cert
RH405 ..............Digital Psychrometer + InfraRed Thermometer Kit
RH405-NIST ....Digital Psychrometer + InfraRed Thermometer Kit w/NIST Cert
444733 ............38% RH calibration reference
444755 ............75% RH calibration reference
589250 ............RS-232 cable
Specifications Range Max Resolution Basic Accuracy
Humidity: 10 to 90%RH 0.1%RH ±3%RH
InfraRed Temperature -40 to 932°F (-40 to 500°C) 0.1° ±3%
Air Temperature -4 to 122°F (-20 to 50°C) 0.1° ±3%
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)
Emissivity Adjustable 0.3 to 0.99
Field of View 8:1
Dimensions/ Weight 6.8x2.7x1.9î (175x70x50mm)/ 4.9oz (140g)
ISO 9001:2000 CERTIFIED
10/06/04 - R1
“Make mine an Extech!
™
”
www.extech.com
RH405 Digital Psychrometer +
InfraRed Thermometer Kit includes
calibration bottles, RS232 cable, and
carrying case.
Product DATASHEET
99 Washington Street
Melrose, MA 02176
Fax [phone]
TestEquipmentDepot.com