OMEGA RH700 Manual

User’s Guide

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SM

RH700

14:1 Data Logging Thermo-Hygrometer

with Pin/Pinless Moisture Meter

omega.com [e-mail]

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [e-mail]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no
liability for any errors it contains, and reserves the right to alter specifications without notice.

14-IN-1 DATA LOGGING

THERMO-HYGROMETER

WITH PIN/PINLESS MOISTURE METER

USER’S MANUAL

RH700

Please read this manual carefully and thoroughly before using this product.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 –4

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

What’s in the Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 –7

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Install Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 –15

Powering On and Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Selecting a Parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

General Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 –9

Recalling Stored Readings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Setting Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 –11

Measuring Moisture Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 –12

Checking Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Data Logging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 –15

Viewing Data Logging Settings . . . . . . . . . . . . . . . . . . . . . . . . . 12 –13

Changing Data Logging Settings . . . . . . . . . . . . . . . . . . . . . . . . 13 –14

Clearing Data Logs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 –15

Starting and Stopping Data Logging . . . . . . . . . . . . . . . . . . . . . . . . .15

Using the Included Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 –16

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Operating & Maintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

INTRODUCTION

Thank you for purchasing OMEGA’s RH700 14-in-1 Data Logging Thermo-Hygrometer with
Pin/Pinless Moisture Meter. Please read this user’s manual carefully and thoroughly before using
the instrument.

The RH700 is a handheld instrument that will prove useful to three broad groups of users:
HVAC/R system installers and technicians, facility maintenance professionals and water damage
restoration contractors.

The first two groups will exploit the meter’s ability to measure, display and store/recall ten
condensation-related parameters: ambient temperature, relative humidity (RH), absolute humidity
(AH), GPP (mixing ratio—in grains per pound or g/kg), dew point, wet bulb temperature, surface
temperature (using an optional “K” type thermocouple probe), condensation temperature (using
an optional “K” type thermocouple probe), atmospheric pressure and vapor pressure. The meter’s

2

large, primary readouts of each of the last eight parameters are accompanied by a smaller,
secondary readout of the first parameter: ambient temperature. The ten parameters measured,
monitored and displayed—individually or in pairs—by the RH700 are most valuable in two
applications:

• Environmental monitoring of office buildings, greenhouses, food and equipment storage
facilities, wineries, freezers, shipping containers, HVAC/R installations, computer rooms,
labs, libraries, museums and saunas.

• Electronics manufacturing. Alerts provided by the low RH alarm of the RH700 can mitigate
the risk of damaging high-voltage static discharges.

Water damage remediators will also make use of the RH700’s ability to calculate an
environment’s mixing ratio (often represented using the unit GPP, or grains per pound). GPP is a
more useful moisture metric than RH to water damage remediators. Using RH alone, a remediator
might unknowingly introduce moist air—with a low RH but a high GPP—during a job’s drying
phase.

Another parameter of interest to water damage remediators is the moisture level of a substance
(typically, wood or building materials). The RH700 can measure this parameter using either a
pinless (non-marring) or pin-type (penetrating) probe; the meter includes both kinds of probe.

Operating in internal moisture mode, the meter uses a non-invasive (pinless) sensor on the back
of the unit to detect moisture up to 3/4 in. (20mm) below the surface of the following materials:
wallboard, masonry, hardwood and softwood. It infers the level of moisture from the material’s
capacitance, which the meter measures by gauging its effect on an electric field that the meter
generates each time it is operated in internal moisture mode.

In internal moisture mode, the meter exploits two physical phenomena to make its
measurements:

1. The linear relationship between a solid material’s moisture level and its dielectric constant—
and therefore its capacitance.

2. The so-called fringing-field effect—the slight spreading of the electric field produced by current
flowing between two electrodes when both electrodes are on the same side of a material.

Behind the back cover of the RH700 are two metal plates. When the meter is powered on, the
plates are given small and opposite charges. The potential difference causes current to flow,
creating a three-dimensional electric field.

When the back of the meter is placed against one side of a material with moisture on or slightly
below its surface, the increased capacitance of the material distorts the electric field to an extent
that can be sensed (as a change in flux over the sensing area) and measured. Displayed readings
reflect the average moisture level of the material between its surface and the electric field’s
maximum penetration of 3/4 in. Moisture closer to the surface has a greater effect on readings
than moisture at the maximum penetration depth.

In external moisture mode, the meter bases its measurements on the relationship between the
moisture content of a material and its electrical conductivity. The wetter a material, the higher its
conductivity. The two replaceable steel pins of the included external probe serve as the
electrodes of a conductance meter optimized for measuring moisture content. The meter displays

measurements in the unit %WME (Wood Moisture Equivalent).

3

For hard materials like wood or concrete, the meter’s readings largely reflect surface moisture
content because: 1) Moisture close to a surface has a greater effect on a reading than moisture
deep below it; and 2) The pins of the external probe are only 3/8 in. (10mm) long and cannot be
driven deep into a hard material. For softer materials like soil, paper or powders, readings are
more likely to reflect the average moisture level of the material between its surface and the
penetration depth of the pins (normally far less than 3/8 in.).

The instrument can be set up to sound an alarm if a measured RH or moisture level is above or
below a user-defined setpoint. Finally, the unit can track the maximum or minimum reading of
any parameter over the duration of a measurement session.

The RH700 can store and recall 20 pairs of measurements in internal nonvolatile memory. It can
also log (with date and time stamps) up to 8000 data points internally, for later download to a PC
and display as an Excel-formatted graph or table.

KEY FEATURES

• Measures 1) ambient temperature, 2) relative humidity (RH), 3) absolute humidity (AH, in

mg/L or g/m
using pinless sensor, 6) absolute moisture level using included pin-type probe, 7) dew point,

8) wet bulb temperature, 9) surface temperature (requires optional “K” type thermocouple
probe), 10) condensation temperature (requires optional “K” type thermocouple probe), 11)
atmospheric pressure and 12) vapor pressure

• Stores/recalls 20 pairs of readings in/from on-board nonvolatile memory

• Logs up to 8000 data points internally, for later download and display as Excel-formatted

graph or table on Windows PC using included software, driver and USB cable

• Settable high and low alarms for RH, relative moisture level and absolute moisture level

• Backlit LCD with 3-digit primary readout + 4-digit secondary readout

• Field calibratable in pinless moisture level mode

• Min/Max, Data Hold, and 30-minute Auto Power Off functions

• 1 year limited warranty

3

), 4) GPP (mixing ratio—in grains per pound or g/kg), 5) relative moisture level

SAFETY INSTRUCTIONS

• Do not operate the RH700 in the presence of flammable or explosive gases.

• The steel pins of the external moisture probe are very sharp. When using the probe, be

careful not to stab yourself or anyone else. Remember to replace the protective cap over the
pins when finished using the probe.

WHAT’S IN THE PACKAGE

The RH700 comes in a soft carrying pouch inside a box. Also included in the box or pouch are a
pin-type moisture probe, a sensor protection cap, a PC interface program and driver on a mini-

disc, a USB cable, a “9V” battery and this user’s manual.

4

PRODUCT OVERVIEW

Fig. 1 shows the names and locations of all of the controls, connectors and physical structures of
the RH700. Fig. 2 shows all possible indications on the unit’s LCD. Familiarize yourself with the
labels, positions and functions of all buttons and connectors before moving on to the Setup
Instructions and Operating Instructions.

Fig. 1. The controls and physical structures of the RH700

A. Humidity/temperature sensor under protective cap
B. Removable hanger tab
C. Socket for optional “K” type thermocouple probe with spade

lugs

D. LCD

LOG/SET

E.

button. Starts and stops data logging.

Also used to view data logging settings.

F.

MAX/MIN
pressing button once displays highest reading

entering that measurement mode.

displays lowest reading

button. For all parameters except moisture level,

since

Pressing button twice

since entering that measurement
mode. Pressing button a third time resumes measurement
and display of same parameter.

Also used to enter alarm set mode.

G.

ZERO

button.

With meter off

, used to disable APO function.
In measurement mode, used to calibrate pinless moisture
(

Moisture Internal

data logging modes

or MI) measurements.

In memory and

, used to clear stored readings and

data.

H.

button.

UNIT

In measurement mode, each press toggles

between Imperial and metric

measurement units for the following parameters: Ambient
Temperature & Dew Point (°F or °C); Absolute Humidity (mg/L or g/m
g/kg); Barometric Pressure and Vapor Pressure (mBAR or KPa).
stored readings.

<DN

button.

I.

Also used to enter alarm set mode

In measurement mode, each press shifts mode selector one position to the left.

.

In memory mode, each press decrements record counter
each press decreases alarm setpoint by 0.1%

J.

button.

UP>

In measurement mode, each press shifts mode selector one position to the right.

.

In memory mode, each press increments record counter
each press increases alarm setpoint

K.

STORE/ENTER

button.

In measurement mode, stores both displayed readings

when pressed and held for >2 seconds.

by 0.1%.

In alarm set mode, saves displayed Hi alarm setpoint

and advances to Lo alarm setting, or saves displayed Lo alarm setpoint and resumes
measurement mode.

In memory mode, exits memory mode

display of last selected parameter.

B
C

F

I

P

M

3

); Mixing Ratio (GPP or

In memory mode

by one digit.

by one digit.

In alarm set mode,

In alarm set mode,

, used to clear

in memory

and resumes measurement and

A

O

D

E

G

H

J

K

L

N

5

L.

M

N

n

HOLD

button.

With meter off

, pressing button powers it on.

With meter on

, pressing button

briefly freezes primary and secondary readouts; pressing and holding button powers meter off.
M. Jack for included pin-type moisture probe N. Mini-USB jack
O. Pinless moisture sensor (on back) P. Battery compartment (on back)

/HOLD button Press to power the unit on, press HOLD button for 2s to power off,

out of viewing mode.

M

Wood moisture probe interface

N

Fig. 2.
All possible

Mini USB interface

LCD Display

display
indications

: Mode selector

: Relative humidity mode indicator
: Absolute humidity mode indicator

[Upper] : Dew point mode indicator

: Condensation temperature mode

indicator
: Mixing ratio mode indicator
: Barometric (ambient) pressure mode

indicator
: Vapor pressure mode indicator
: Pinless moisture measurement mode

indicator
: Pin-type moisture mode indicator
: Time setting indicator

: Data logging interval setting indicator

[Upper] : Data logging length setting

indicator
: Data log working group setting indicator
: Clear data logging setting indicator

6

: Default setting indicator

: Alarm limit indicators

,
: Data logging indicator

: Zero indicator

: Pin/pinless moisture level indicator

Mini US

/HOLD b

out of viewi

, : Maximum & minimum value

indicators

utton Press to power the unit on, press HOLD button for 2s to pow

g mode.

oisture probe interface

B interface

ay

: Data hold indicator

: Primary readout

: Secondary readout

: Recall mode indicator

: Record number indicator

: Condensation level indicators

: USB connection indicator

:Low battery icon

: Probe indicator

[Lower] : Dew point temperature

indicator

: Web bulb temperature indicator

,

: Date and Time indicators

: Auto power off enabled indicator

r off,

, : Mixing ratio units

, : Absolute humidity units

, :Relative humidity unit

: Temperature units

, : Pressure units

:Seconds, minutes, hour, day

indicators

SETUP INSTRUCTIONS

INSTALL BATTERY

To open the battery compartment:

1) Turn the meter over and loosen the single screw securing the battery compartment cover.
Remove the screw and set it aside.

2) Lift the tab at the bottom of the cover in order to remove it and set it aside.

3) Plug the included “9V” battery into the wired socket inside the compartment. The terminals
of the battery and the socket mate in only one way, with the smaller male terminal plugging
into the larger female terminal.

4) Replace the battery compartment cover and reinstall the screw to secure the cover.

OPERATING INSTRUCTIONS

POWERING ON & OFF

To power on the meter

begin making and displaying RH (relative humidity) measurements.

Before using the meter

humidity/temperature sensor.

To power off the meter

will be announced by two short beeps.
After powering off the meter, replace the sensor protection cap if you do not expect to use the

instrument within the next few hours.
By default, the meter will automatically power itself off if no front-panel button is pressed within

any 30-minute period. The upcoming shutdown will be announced by three beeps of the beeper.
When this Auto Power Off function is active, the term
(see Fig. 2).

To disable the APO function

holding the

ZERO

disabled, the term

, press the

HOLD

button. By default, the instrument will immediately

to make measurements, remove the dust cap protecting the

, press and hold the

HOLD

button for at least 2 seconds. The shutdown

APO

will appear in the middle of the LCD

, you must power on the meter in a special way, by pressing and

button while pressing the

APO

will

appear on the LCD.

not

HOLD

button. When the APO function has been

7

SELECTING A PARAMETER

n

The RH700 can measure and display the value of multiple
moisture-related parameters. When the meter is in measurement
mode, you select a parameter by pressing either the

UP>

or

<DN

button to move the pointer on the top line of the LCD directly
above it. For example, at right is the display for RH measurement
mode—the operating mode that the meter enters by default when
it is powered on.

As the lower figure at right shows, moving the
position to the right (by pressing the

UP>

button once) changes the

pointer one

measured parameter to AH (absolute humidity).

GENERAL CONTROLS

Changing measurement units

units for all parametric readouts.

wet bulb and dew point temperatures will then be displayed as °C rather than °F; absolute

humidity values will be stated in g/m

. By default, the RH700 uses Imperial

To switch to metric units

3

rather than in mg/L; mixing ratios will be displayed in units

, press the

UNIT

button. Ambient,

of g/kg rather than GPP; and barometric pressures and vapor pressures will be stated in KPa

rather than mBAR.

Backlight

. The RH700 has a green backlight that automatically illuminates whenever any button

is pressed. It will remain on for 30 seconds and then extinguish to extend battery life.

Holding readings. Briefly

pressing the

HOLD

button freezes both
the primary and secondary readouts. will appear on the
display to remind you that the readouts are frozen.

To release the hold, briefly press the

HOLD

button again.

Note: When the RH700 is in Hold mode, it takes two separate

HOLD

presses of the

button to power off the meter. The first
(brief) press (accompanied by a short beep) releases the hold. The
second press (and hold) initiates shutdown (announced by two short beeps).

Storing readings

. Pressing and holding the

STORE/ENTER

button for at least 2 seconds saves the
values shown on the primary and secondary readouts as a pair in the meter’s nonvolatile
memory. Each “save” automatically increases by one the Record number indicator—the number
above

MEM

at the lower left of the LCD. The readings remain in memory, available for recall, after

the meter powers off.

The next section of this manual contains instructions for recalling
saved readings.

MIN/MAX tracking

•

Pressing the MAX/MIN button once displays the highest
reading

since entering that measurement mode. will

. For all parameters except moisture level:

/HOLD b

out of viewi

appear at the left of the primary readout.

8

•

m

Pressing the button twice displays the lowest reading

entering that measurement mode. will appear at the left of

Wood

Mini US

since

the primary readout.

Pressing the button a third time resumes real-time

•

measurement

and display of the same parameter.

RECALLING STORED READINGS

To enter Recall mode

, press the

<DN

and

buttons at the same time. will appear

UP>

above the Record number indicator at the lower left of the LCD. The Record number indicator will
correspond to the last pair of readings stored.

You can now use the

<DN

and

UP>

buttons to navigate to and display a specific pair of readings.
For example, the screen shot below shows that a pair of readings of 63.8% for RH and 28.8°C for
temperature were stored in Record location 08.

Alternatively, you can repeatedly press the
readings in the order in which they were stored, or the
to recall them in reverse order. Pressing the

button to recall all

UP>

button when the

UP>

<DN

button

last stored pair of readings is displayed returns the Record

01

number indicator to
stored. Pressing the

, corresponding to the first pair of readings

<DN

button when the first stored pair of
readings is displayed returns the indicator to the record number of
the last pair of readings stored.

To exit Recall mod
To erase all stored readings

e and resume making real-time measurements, press the

, press and hold the

ZERO

and

UNIT

STORE/ENTER

button.

buttons at the same time for at least 2 seconds. The meter will
respond by sounding three short beeps and resetting the Record
number to

. You can clear all stored readings while operating in

01

Recall mode or Measurement mode. Clearing the memory in
Recall mode produces the display at right.

SETTING ALARMS

Note: Follow the instructions in this section to manually set, change or arm/disable the RH and
moisture level alarms using buttons on the meter. To perform the same tasks using the X-In-1
software included with the meter, install and operate the program using the instructions in the
“Using the Included Software” section beginning on p. 15.

The RH700 allows you to set alarms that will repeatedly sound the
beeper if the measured RH level or the moisture level of a material
(measured by either the pinless or pin-type sensor) is above or
below a certain value. The upper and lower limits are called alarm
setpoints. For example, the screen shot at right shows that the

HIGH

upper limit for RH—the

setpoint of the RH alarm—has been

set to 63.8%.

9

To enter Alarm set mode
MOISTURE INTERNAL (MI)

value of the selected parameter’s high setpoint and cause the word

, press the

or

MAX/MIN

and

MOISTURE EXTERNAL (ME)

UNIT

buttons at the same time while in

mode. Doing so will display the current

HIGH

to appear on the

RH,

display, as shown in the screen shot at the bottom of the previous page.
All three parameters require you to use the same three-step sequence of button presses for

HIGH

changing their setpoint(s). After entering Alarm set mode (with

HIGH

can either raise or lower the

setpoint by using the
unchanged (if you wish to change only the
the setpoint by 0.1%. Each press of the

<DN

setpoint). Each press of the

LOW

button decreases the setpoint by 0.1%. To change

UP>

or

the value of the setpoint by a large amount, you can press and hold the

appearing on-screen), you

<DN

button, or leave it

button increases

UP>

UP>

or

<DN

button for at

least 3 seconds.

HIGH

Whether or not you change the

setpoint, you must press the
proceed to the next step in the sequence: changing the
button with
parameter’s new
show the current value of the parameter’s

Once
parameter’s
you can leave the
must be to press the
readout as the selected parameter’s new

HIGH

on-screen saves the value shown on the primary readout as the selected

HIGH

setpoint. It also changes

LOW

appears on-screen, you can use the

LOW

setpoint, as explained earlier in the paragraph on

setpoint unchanged. Whether or not you make a change, your next step

LOW

STORE/ENTER

HIGH

to

LOW

setpoint.

UP>

or

button. Doing so saves the value shown on the primary

LOW

setpoint. It also causes

LOW

LOW

<DN

STORE/ENTER

setpoint. Pressing the

button to

STORE/ENTER

and switches the primary readout to

button to change the value of the

HIGH

setpoints. Alternatively,

LOW

to disappear and

returns the RH700 to operation in real-time RH measurement mode.

To disarm any of the six alarms(HIGH

to 100.0% or 0.0% by pressing the

UP>

to use the

button to increase its setpoint to 100% than to use the

setpoint to 0.0%. In practice, what you would do is: 1) press and hold the

UP>

and

or

LOW

for RH, MIand ME), you must reset its setpoint

<DN

button. When disarming a

HIGH

alarm, it is faster

<DN

button to decrease its

UP>

button until the

display shows a value greater than 99%, 2) release the button, and 3) use brief presses to reach

UP>

99.9%. When the primary readout shows 99.9%, the next press of the
the readout to

OFF

. Pressing the

STORE/ENTER

button at this point will disarm the

button will change

HIGH

alarm for

that parameter.
Similarly, you would disarm a

alarm by 1) pressing and holding the

LOW

button until the

<DN

display shows a value less than 1%, 2) releasing the button, and 3) using brief presses to reach

<DN

0.1%. When the primary readout shows 0.1%, the next press of the
readout to

OFF

. Pressing the

STORE/ENTER

button at this point will disarm the

button will change the

LOW

alarm for that

parameter. The screen below right shows the next-to-last step (prior to pressing the

STORE/ENTER

button) of disarming the

alarm for RH.

LOW

Two notes related to alarms:

1)

HIGH

alarm setpoints must be higher than
When the display is showing
the

STORE/ENTER

button to save a change that violates this

LOW

in Alarm set mode, pressing

LOW

alarm setpoints.

rule will not succeed in returning the RH700 to real-time
measurement. Instead, the beeper will sound four times and the

10

Alarm set sequence will return to the first step. Consider this a prompt to reset the

LOW

setpoint to a value greater than the

2) The original factory settings of the

alarm setpoint.

HIGH

and

LOW

alarm setpoints are 85% and 25%,

HIGH

respectively. So if your first use of the meter is in a exceptionally humid or dry environment, an
alarm may sound immediately. To disarm the alarm, follow the instructions in the preceding
two paragraphs.

MEASURING MOISTURE LEVELS

In addition to the modes for measuring five condensation-related parameters, the RH700 has

MI

two separate moisture level measurement modes:

and ME. In MI mode, the meter uses a

non-invasive (pinless) sensor on the back of the unit to detect moisture on or within 0.75 in.

ME

(19mm) of the surface of a material. In

mode, the meter uses the included pin-type probe to

measure the conductivity of a material as a proxy for its moisture content.
In both moisture level measurement modes, the RH700’s display adds a vertical bar graph to

the digital readout of a material’s moisture level. The bar graphs (see below) have no scale; they
exist only to provide an analog way to quickly track changes in relative moisture levels.

alarm

To use the included pin-type probe to measure the moisture level of a material:

1. Use the

UP>

or

button to move the pointer above ME.

<DN

2. Insert the plug of the probe into the jack on the bottom of the RH700.

3. Remove the protective cap from the business end of the probe and set it aside.

4. Insert the pins of the probe into the material whose moisture level you wish to measure.

The measured moisture level will appear on the primary readout as a percentage, with the
ambient temperature below it on the secondary readout.

To use the pinless sensor to measure the moisture level of a material

, use the

UP>

or

<DN

button to move the pointer above MI. Hold the meter in either hand by wrapping your fingers
around the rubber grip at the bottom of the unit. Make sure that no part of your hand or fingers is
touching—or even near—the pinless sensor on the back of the meter.

If the primary readout shows

0.0%

with the meter in your hand (and not touching anything), the
meter is ready to make measurements. To measure the moisture level of a material, press the
pinless sensor on the back of the meter (Fig. 1, Callout M) against it. The moisture level, as a
percentage, will appear on the primary readout.

11

If the primary readout shows a value other than

MI

calibrate the meter to operate in

mode. To do so, continue to
hold the meter in your hand (touching nothing) and press the
button. Immediately after the term

ZERO

appears briefly below the

0.0%

, you must

ZERO

bar graph at the left of the display, the primary readout will show

0.0%

and the meter will be calibrated and ready to operate in

MI

mode.

To obtain accurate readings in

mode, you must recalibrate the meter each time you re-enter

MI

that mode from another mode.

CHECKING CALIBRATION

check

Although you cannot calibrate the RH700 yourself, you can

the meter’s calibration
periodically to assure yourself of the accuracy of humidity-related readings (RH, absolute
humidity, dew point and mixing ratio). Factory calibration should minimize the humidity sensor’s
drift for several years—well beyond the warranty period.

At a minimum, a calibration check should entail immersing the slotted structure protecting the
humidity sensor in two bottles containing saturated salts. One reference salt should produce a
reading of a 33%; the other should produce a reading of 75%.

Depending on the size and shape of the calibration salt bottle that you use, you may have to
remove the hanger tab (Fig. 1, Callout B) from the meter to provide sufficient clearance for the
bottle to fit snugly over the slotted structure protecting the humidity/temperature sensor (after
removing the dust cap). The hanger tab is removable for that reason.

DATA LOGGING

This section explains how to use front-panel buttons on the RH700 to view and manually change
data logging settings and to clear logged data from the meter's memory.

The final section of this manual—

Using the Included Software

, beginning on p. 15—outlines how
to do the same tasks more quickly and easily by pressing soft buttons on the X-In-1 application
included with the meter.

Viewing Data Logging Settings
To view your data logging settings

mode selector does not appear above TM, press the

the

UP>

button to move the selector above TM, at the left side of the

, press the

top line of the display. Once the selector is above

LOG/SET

TM

, the two-digit

button. If

<DN

or

date portion of the system clock setting (09:18, or September 18,
2012 in the upper screen shot at right) will be visible on the
secondary readout.

12

To show the time portion of the system clock setting, press the
or

STORE/ENTER

button with the date value on-screen. In the lower

UNIT

screen shot at right, the time shown is 19:18:12 (7:18:12 p.m.)

UP>

Next, press the
right, above

INT

button to shift the icon one position to the

.

Doing so will shift the secondary display to the value of the auto
recording time interval

TML

, and then again to display the working group

. Press the

INT

button once more to display the recording time length

UP>

JOB

number.

To stop displaying data logging settings and return to showing real-time readings, press the

HOLD

button.

Changing Data Logging Settings
To reset the system clock

selector is positioned over

DATA

With

showing on-screen, press the

, begin by pressing the

TM

.

LOG/SET

side of the LCD to begin flashing. To increment the Year value, press the
decrement the Year value, press the

When the Year value is correct, press the

STORE/ENTER

LOG/SET

Month field, which should now be flashing. Use the
Month setting. Then press the
Again use the

UNIT

or

STORE/ENTER

LOG/SET

button to save the setting and advance to the Day field.

button to correct the Day value and press the

LOG/SET

button and making sure the mode

button. This will cause the Year field at the left

UNIT

button. To

button.

button to save the setting and advance to the

UNIT

or

STORE/ENTER

button to correct the

LOG/SET

button to save the setting.
Pressing the

secondary display to show the current time. As you did with the Date, use the

STORE/ENTER

have finished setting the system clock, press the
the process by pressing the

To change the value of the data logging time interval INT

● Press the

● Move the

● Press the

LOG/SET

button with the Day value of the system clock flashing switches the

UNIT

or

button to correct each of the Hour, Minutes and Seconds values in turn. Once you

LOG/SET

HOLD

button to return to displaying real-time readings.

button to save the setting. Complete

:

LOG/SET

LOG/SET

button to enter viewing and setting mode

mode selector over

INT

.

button again. This will cause the two digits on the secondary display to

flash.

13

● Use the
The default value of
possible value is 24 hours. The terms
seconds, minutes and hours, respectively. If you press and hold the

UNIT

button to increase the

INT

INT

value or the

STORE/ENTER

button to decrement it.

is 15 seconds. It is also the minimum possible value. The maximum

S, M

and Hon the line above the

UNIT

INT

value stand for

or

STORE/ENTER

button, you can ramp up or down quickly to any possible value. The seconds, minutes and
hours indicators will automatically change as you ramp up and down.

● When you have finished changing the value of

, press the

LOG/SET

button to save your

INT

setting.

HOLD

Complete the process by pressing the

●

button to return to displaying real-time

readings.

To change the value of the data logging time length setting TML:

● Press the
Move the

●

Press the

●

LOG/SET

button to enter viewing and setting mode.

mode selector over

LOG/SET

button again. This will cause the two digits on the secondary display to

TML

.

flash.
Use the

●

it. The default value of

UNIT

button to increment the

TML

TML

value or the

STORE/ENTER

button to decrement

is 15 minutes. The minimum possible value is 1 minute, and the

maximum possible value is 30 days. It’s important to understand that the value of

INT

be greater than that of

. The terms

days, hours and minutes, respectively. If you press and hold the

D, H

and Mon the line above the

UNIT

TML

value stand for

or

STORE/ENTER

button, you can ramp up or down quickly to any possible value. The days, hours and minutes
indicators will automatically change as you ramp up and down.

● When you have finished changing the value of

, press the

LOG/SET

button to save your

TML

setting.

HOLD

Complete the process by pressing the

●

button to return to displaying real-time

readings.

TML

must

CLEARING DATA LOGS

To clear all stored data logs:

● Press the

● Move the

LOG/SET

button to enter viewing and setting mode.

mode selector over

right).
Press and hold the

●

ZERO

briefly, followed by the screen
below right. All stored data logs
will be erased and the number of
the

JOB

working group will be

reset to

14

01

.

CLR

(see screen shot at

button for at least 2 seconds. The screen below left will appear

● Complete the process by pressing the

HOLD

button to return to displaying real-time

readings.

Starting and Stopping Data Logging
To initiate data logging

, make sure the RH700 is

not

operating
in settings viewing or changing mode. Then disable the meter’s
Auto Power Off (APO) function by pressing and holding the

HOLD

button while pressing the /

LOG/SET

the

JOB

and the current real-time data readout will appear on-screen.

button for at least 2 seconds. The terms

button. Next, press and hold

The unit will begin logging data according to stored settings. Note that the term

LOG

ZERO

and

has

APO

disappeared from the screen, indicating that the meter’s Auto Power Off function has been
disabled.

To stop data logging

and

JOB

will disappear from the screen.

, press and hold the

LOG/SET

Each time logging is started or stopped, the
increased by 1 up to a maximum of 99 groups. When 98 groups have been stored, the term
will be replaced by the term

FL

(full). Additional logging cannot occur until existing logs are

button for at least 2 seconds. The terms

JOB

working group number will automatically be

LOG

JOB

cleared.

USING THE INCLUDED SOFTWARE

The main purpose of the X-In-1 application on the mini-disc supplied with the RH700 is to
display data logs captured and stored by the meter. The program’s secondary function is to make
it easy to set the meter’s system clock and to change its data logging settings and temperature
and moisture alarm setpoints.

To install the X-In-1 program

, place the mini-disc face-up in the tray of your computer’s optical
drive, open the <Volume> folder, and double-click the <setup.exe> file. Run the installation
Wizard, which will also automatically locate and install the correct driver for your PC’s operating
system.

After the program installs, do not open it yet. First, connect the RH700 to your computer by
inserting the mini-plug end of the included USB cable into the mini-USB jack on the bottom of the
meter (Fig. 1, Callout N) and inserting the full-size plug at the other end of the cable into a USB
port of your computer. Note that inserting the cable causes the icon to appear on the meter’s
LCD.

The icon indicates that a two-way link has been established between the meter and the
software. Working in one direction, the link enables data logs stored in the meter to be
downloaded to your PC and displayed by the program as a table or graph. Working in the
opposite direction, the link allows you to set the system clock and change data logging and alarm
settings using your mouse and have those changes reflected inside the meter.

15

It’s important to realize that

connected

to your PC.

data logging cannot be started or stopped while the RH700 is

Now open the X-In-1 program. The screen shot below shows the main area for displaying a data
log as a graph or table (list). Above this area are boxes you can check to select which logged
parameters you wish to display. At the upper left side of the screen are circles you can check to
select the units of key measurement parameters. Below these circles are six boxes for manually
entering high and low (Min and Max) RH and Moisture alarms and the data logging sampling
interval and run time. Below those circles are four buttons, including one (SynTime) for
synchronizing the RH700’s system clock to your computer's clock, and another for downloading
data logs from the meter to your PC.

16

SPECIFICATIONS

Ambient Temperature Measurement Range -20° to 167°F (-29° to 75°C)

Ambient Temperature Measurement Accuracy ±3.6°F (2°C)

RH Measurement Range 0 to 100%

RH Measurement Accuracy ±2.5% from 11 to 90%RH; ±3%RH elsewhere

Absolute Humidity Range 0.5 to 240mg/m3(mg/L)

GPP Range 0 to 999 GPP (0 to 160g/kg)

Relative/Absolute Moisture Level Range 0 to 99.9%

Pinless Moisture Measurement Depth 0.75 in. (19mm)

Dew Point Range -76° to 140°F (-60° to 60°C)

Atmospheric Pressure Range 30 to 120 kPA

Vapor Pressure Range 0 to 20.0 kPA

Surface Temperature Measurement Range: -148° to 1832°F (-100° to 1000°C)

Sampling Rate 2X/sec

Memory Capacity 20 pairs of readings

Auto Power Off Trigger 30 minutes of inactivity

Backlight Duration 30 seconds

Battery Life 6 to 8 weeks (4 hrs/day use)

Operating Temperature 32° to 110°F (0° to 43°C)

Storage Temperature -14° to 140°F (-30° to 60°C)

Dimensions 7.3 x 2.8 x 1.4 in. (185 × 72 × 36mm)

Weight 6.2 oz. (175g), without battery

Power Source (1) “9V” battery (included)

17

OPERATING & MAINTENANCE TIPS

• When the icon appears on the bottom left of the LCD, it’s time to install a fresh “9V”
battery using the procedure on p. 7.

• Do not immerse the RH700 in water or get water on it.

• Do not disassemble the unit. Opening the case voids the warranty.

• To avoid fouling the humidity/temperature sensor, do not operate the unit in very dusty
environments. Rotate the sensor protective cap to close the vents after each measurement
session.

• Remove the battery if you do not expect to use the unit for several months or longer.
This will avoid potential leaks of battery acid that might damage or destroy the unit.

18

WARRANTY/ DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGA’s Warranty adds an additional one (1)
month grace period to the normal one (1) year product warranty to cover handling and shipping
time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired
or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action
of the purchaser, including but not limited to mishandling, improper interfacing, operation outside
of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the
unit shows evidence of having been tampered with or shows evidence of having been damaged
as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification;
misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in
which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes
liability for any damages that result from the use of its products in accordance with
information provided by OMEGA, either verbal or written. OMEGA warrants only that
the parts manufactured by the company will be as specified and free of defects. OMEGA
MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of
purchaser set forth herein are exclusive, and the total liability of OMEGA with respect
to this order, whether based on contract, warranty, negligence, indemnification, strict
liability or otherwise, shall not exceed the purchase price of the component upon which
liability is based. In no event shall OMEGA be liable for consequential, incidental or
special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as
a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity;
or (2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY/ DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or
damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/ INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.
BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED
RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO
AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside
of the return package and on any correspondence. The purchaser is responsible for shipping charges,
freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which the
product was PURCHASED,

2. Model and serial number of the product under
warranty, and

3. Repair instructions and/or specific problems
relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This
affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2015 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photo-

copied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in
part, without the prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS,
for current repair charges. Have the following
information available BEFORE contacting
OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

consult OMEGA

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Shop online at omega.com

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