User manual

2 WB200-EU-EN V1.4 8/13
Introduction
Thank you for selecting the Extech Instruments WB200 Thermo-Hygrometer Datalogger with Dew
Point and Wet Bulb Temperature readings. This device measures and displays four (4)
environmental parameters: Air Temperature, % Relative Humidity, Wet Bulb Temperature, and Dew
Point Temperature. This meter combines traditional dry/wet bulb operation with modern electronic
circuitry providing accurate readings and trouble-free operation especially in dusty environments.
The built-in datalogger, with selectable sampling rate, captures up to 100 readings for each
measurement type. The stored readings can be viewed on the meter’s LCD display.
The WB200 is perfect for greenhouses, other high humidity areas, and locations prone to harsh
environmental conditions.
This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable
service. Extech Instruments is an ISO-9001 certified company. Check the Extech website
(www.extech.com) to check for newer versions of this User Guide.
Features
 Large easy-to-read LCD display
 Two thermistors provide fast, accurate readings
 Built-in fan quickens response time
 Fan can be set to run continuously or in the ‘economical’ mode where it throttles on and off
 Datalogger stores 100 records (each record contains 4 measurement types)
 Selectable datalogging sampling rate from 15 minutes to 60 minutes
 Temperature and humidity high/low alarms (fully programmable)
 Dual color LED indicator for datalogging (green) and alarm (red) modes
 Maximum/Minimum function shows highest and lowest readings
 Selectable temperature units
o
C/
o
F
 Low battery indicator
Powering the Meter
The WB200 can be powered using the four (4) supplied 1.5V batteries (AAA) or the supplied 5V
power adaptor; the adaptor is recommended for extended measurement sessions. When the low
battery icon appears replace the batteries promptly. Operating in a low battery condition will affect
vane rotation and measurement functions adversely. The battery compartment is located on the
bottom of the meter. Please refer to the Battery Replacement section of this guide for more
information.
Mounting the Meter
The meter can be placed on any surface or may be suspended by wire or string using the two
mounting holes at the top of the meter (one on either side of meter top). If the meter is to be kept on
a table top, work bench, or desktop surface take great care to avoid having the meter fall over on its
side (this may spill the contents of the water tank and may interfere with the operation of the fan).
Suspension is the preferred method of mounting since the meter is unlikely to fall over while
suspended.