Extech RH550 Operating Manual
USER MANUAL
Humidity/Temperature Chart Recorder
with Touch-Screen and Dew Point calculation
MODEL RH550
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Table of Contents
1. INTRODUCTION 3
1.1 Key Features 3
1.2 Common Applications 3
2. DESCRIPTION 4
3. BASIC OPERATION 5
3.1 Setting up the RH550 5
3.2 Meter Power 5
3.3 Main Interface Screen 6
3.4 Main Operating Modes (LIVE and RECORD) 7
4. MAIN MENU 8
4.1 GENERAL SETUP 8
4.2 RECORDING SETUP 8
4.3 VIEW ALARMS 9
4.4 HISTORY 9
4.5 DISPLAY SETUP 10
4.6 DATE & TIME SETTINGS 11
4.7 INFORMATION SCREEN 11
5. PC INTERFACE 12
6. SCREEN-SHOT STORAGE 12
7. FIRMWARE UPGRADE 12
8. SPECIFICATIONS 13
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1. Introduction
Thank you for selecting the Extech RH550 Humidity/Temperature Chart Recorder with TouchScreen. The RH550 measures and records temperature, relative humidity, and dew point in real
time and displays the readings in digital and graphic formats. The touch-screen menu allows you
to program datalogging parameters and to customize the graphic display. Eight (8) GB of memory
is included for capturing large amounts of data, easily transferrable to a PC (in CSV format for
convenient integration with the most common programs).
We ship this meter fully tested and calibrated and, with proper use, it will provide years of reliable
service. Please visit our website (www.Extech.com) for additional information including the latest
version of this User Manual and Customer Support.
1.1 Key Features
• Digital and graphic display of air temperature, humidity, and dew point temperature
• High accuracy temperature/humidity sensor with 197cm (6.5’) extension cable
• High-resolution color touch-screen LCD (1024 x 600 pixels) with brightness control, screen
saver, and sleep mode
• Real time monitoring (live mode) and datalogging (record mode)
• Screen Saver continues to show digital and graphic representation of real-time readings
• Intuitive menu for setting alarms, changing temperature units, setting date/time, updating
firmware, configuring the datalogger, setting display options, and viewing data logs
• MIN-MAX display for air temperature, relative humidity, and dew point temperature
• Tap the screen to move the cursor position on the displayed graphs (curves)
• Datalogger with eight (16) GB of memory; user-programmable sampling rate, start time, and
data point limit
• View historical datalog records on the RH550 screen
• CSV formatted recorded data, easily transferrable to PC using supplied USB cable
• Built-in table-top stand and detachable wall-mounting bracket with hinge
• Supplied rechargeable lithium battery, AC adaptors, USB cable, and sensor extension cable
1.2 Common Applications
• Food processing plants
• Clean rooms
• Calibration labs
• Environmental monitoring
• Health care facilities
• Storage/warehouse monitoring
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• Office and workspace comfort
• Museum and artwork protection
2. Description
1. Touch-screen display
2. USB jack (for powering the meter and connecting to a PC)
3. Temperature/Relative Humidity sensor (shown connected to the
cradle jack)
4. Power ON-OFF button
5. Sensor extension cable (RH550-C)
6. Wall mount bracket
7. Desktop tilt stand
8. Sensor cradle jack (shown with sensor
installed)
9. Wall mount screw holes
10. Wall mount bracket hinge
4
3
1
2
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3. Basic Operation
3.1 Setting up the RH550
With the meter OFF, slide the sensor (3) directly onto the cradle jack (8).
Use the 197cm (6.5’) RH550-C extension cable (5) if you prefer to locate the sensor remote
from the main unit. To use the extension cable, remove the sensor from the RH550 (if
connected) and slide the sensor onto the cradle jack on one end of the extension cable. The
other end of the cable slides onto the RH550 sensor cradle jack (8).
Mount the RH550 on a wall using the supplied wall mount bracket (6) and screws. Mount the
bracket on the wall first and then snap the RH550 onto the bracket. Note that the wall mount
bracket has a swivel arm (10) for convenient angling.
Note: Mount the bracket with the hinge to the right in order for the display to be upright.
3.2 Meter Power
A rechargeable, lithium battery (installed at the factory) powers the RH550.
To switch the RH550 ON or OFF, long press the power button (4).
To recharge the battery, plug the supplied USB cable into the USB jack (2) on the RH550 and
to an AC power source, or connect the RH550 to a PC USB port.
To view battery status while charging, short press the power button.
To put the display in sleep mode manually, when in normal use (not charging), short press
the power button (4).
Use the MAIN MENU to set display options such as screen saver and sleep mode.
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