Extech Instruments RH101 User manual

User's Guide

Hygro-Thermometer + InfraRed Thermometer

Model RH101

Patented

RH101-EU V3.0 11/07

Introduction

Congratulations on your purchase of the Extech Hygro-Thermometer plus InfraRed

Thermometer. This device measures relative humidity, air temperature (with probe), and

surface temperature (with the InfraRed function). The large, easy-to-read backlit LCD

includes primary and secondary displays plus numerous status indicators. The InfraRed

feature includes a laser pointer for convenient targeting. Careful use of this meter will

provide years of reliable service.

Specifications

Display Dual LCD with Backlight and status indicators

Sensor Type Humidity: Precision capacitance sensor

Temperature: Thermistor (probe) and InfraRed

Response Time IR Temperature: 0.5 seconds; Probe Temperature and

Relative Humidity: 3 minutes

Accuracy note Accuracy is specified for the following ambient temperature

range: 64 to 82°F (18 to 28°C)

Sampling Rate 2.5 samples per second

InfraRed Emissivity 0.95 (fixed)

IR Field of View D/S = Approx. 8:1 ratio (D = distance, S = spot)

Laser power Less than 1mW

IR Spectral Response 6 to 14 μm (wavelength)

Operating Conditions 32 to 122oF (0 to 50oC); < 80% RH non-condensing

Storage Conditions 14 to 140oF (-10 to 60oC); <80% RH non-condensing

Power Supply 9V Battery with auto power off (after 10 minutes)

Battery Life Approx. 24 hours (if Backlight and Laser are used continuously

the battery life is reduced to 2 to 3 hours approx.)

Dimensions / Weight 5.9 x 2.8 x 1.4” (150 x 72 x 35mm); 8.3 oz. (235g)

Patent Notice U.S. Patent 7168316

Safety

•Use extreme caution when the laser pointer beam is on

•Do not point the beam toward anyone's eye or allow the beam

to strike the eye from a reflective surface

•Do not use the laser near explosive gases or in other

potentially explosive areas

Function Range and Resolution Accuracy

Humidity 10.0 to 95.0% RH ± 3.5% RH

Air Temperature -4 to 140oF (-20 to 60oC) ± 3.0oF (± 2.0oC)

-58.0 to -4.0oF (-50.0 to -20.0oC) ± 9oF (± 5oC)

-4.0 to 199.9oF (-20.0 to 93.3oC)

200 to 400oF (93oC to 204oC) ± 2% of rdg or ± 4oF (± 2oC)

IR Temperature

400 to 932oF (204oC to 500oC) ± 3% of rdg

RH101-EU V3.0 11/07

Meter Description

1. Humidity/Air Temperature Probe

2. Probe input jack

3. Laser pointer

4. IR Sensor

5. Rubber holster

6. LCD Display

7. IR thermometer measurement button

8. IR and Relative Humidity function buttons (4)

9. Air Temperature function buttons (3)

10. Probe holder

11. Power ON/OFF button

12. Backlight button

Note: The battery compartment, tilt stand, tripod mount, and probe holder removal screw

are located on the rear of the instrument

Display Layout

•MAX (top of LCD): Max Hold function engaged for the Air Temperature function

•HOLD (top of LCD): Data Hold function engaged for the Air Temperature function

•PROBE TEMP: Reminder that the top LCD digits represent Air (Probe) Temperature

•: Indicates that the laser pointer is on.

•IR TEMP: Indicates that the larger LCD digits represent IR temperature measurement

•MAX (bottom of LCD): Max Hold for the IR Temperature and RH function

•HOLD (bottom of LCD): Data Hold for the IR Temperature function and RH function

•oC / oF: Temperature units of measure

•%RH: Relative Humidity unit of measure

•Large LCD digits at center of display for Relative Humidity and IR Temperature

•Smaller LCD digits at top, right of display for Probe Temperature

•: Low battery indicator

RH101-EU V3.0 11/07

Operation

Power

Press the button to turn power on or off.

Probe Humidity and Temperature Measurements

1. Attach the probe to the meter via the jack at the top of the meter.

2. Hold the probe in the area to be tested & allow adequate time for readings to stabilize.

3. Read the Relative Humidity (center of LCD) and Probe Temperature (top of LCD).

NOTE: Do not immerse the probe in liquid; it is intended for use in air only.

InfraRed (Non-Contact) Temperature Measurements

1. The IR sensor is located at the top of the meter.

2. Point the sensor toward the surface to be measured.

3. Press and hold the large red IR button to begin measuring the surface

temperature of a desired target. IR TEMP and will appear on the

display. The laser pointer will switch on to help aim the meter.

4. The measured IR surface temperature will appear at the center of the

LCD (larger digits). The temperature displayed is the temperature of the

area within the spot.

5. When the red IR button is released, the laser pointer will switch off and

the reading will freeze (data hold) on the display for approx 10 seconds.

6. Note that the probe (Air Temperature wand) continues to monitor

temperature during IR tests and its temperature is displayed on the top

of the LCD (smaller digits).

7. After approx. 10 secs. the meter defaults to the Humidity and Air

Temperature display.

Automatic Power OFF

To conserve battery life the meter automatically shuts off after 10 minutes.

oF/oC buttons

The Air Temperature and the IR Temperature units can be selected by the user. For Air

Temperature, press the oF/oCbutton on the bottom left. For the IR temperature units, press

the oF/oCbutton at the center of the meter.

Data Hold Buttons

Displays can be held (frozen) at any time by pressing the HOLD button. For Air

Temperature, use the HOLD button on the bottom right. For IR Temperature and for

Relative Humidity, use the HOLD button on the right center of the meter. Press HOLD

again to exit the mode. Note that in IR temperature mode Data Hold is automatically

engaged when the red IR button is released.

MAX Buttons

Press the MAX button (bottom of meter for Air Temperature; center of meter for IR

temperature and Relative Humidity) to display only the highest reading. The displayed

measurement will now only change when a higher reading is detected. Press the MAX

button again to exit this mode.

Backlight Press the backlight button to turn the light on. Press again to turn it off.

Spot

RH101-EU V3.0 11/07

InfraRed Measurement Considerations

•When taking IR measurements the meter automatically compensates for ambient

temperature changes. Note that it may take up to 30 minutes to adjust to extremely

wide ambient changes.

•Low temperature measurements quickly followed by high temperature measurements

may require several minutes to stabilize as a result of the IR sensor cooling process.

•If the surface of the object under test is covered with frost, oil, grime, etc., clean before

taking measurements.

•If an object's surface is highly reflective apply masking tape or flat black paint before

measuring.

•Steam, dust, smoke, etc. can obstruct measurements.

•To find a hot spot, aim the meter outside the area of interest then scan across (in an up

and down motion) until the hot spot is located.

IR Theory

IR thermometers measure the surface temperature of an object. The meter’s optics sense

emitted, reflected, & transmitted energy that is collected and focused onto the meter’s

detector. The meter’s circuitry translates this information into an LCD reading.

IR Field of View

Ensure that the desired target is larger than the spot size as shown in the diagram below.

As the distance from an object increases, the spot size of the area measured by the meter

becomes larger. The meter’s field of view ratio is 8:1, meaning that if the meter is 8 inches

from the target, the diameter (spot) of the object under test must be at least 1 inch. Other

distances are shown below in the field of view diagram.

Emissivity

Most organic materials and painted or oxidized surfaces have an emissivity of 0.95 (fixed

setting in the model RH101). Inaccurate readings will result when measuring shiny or

polished surfaces. To compensate, cover the surface under test with masking tape or flat

black paint. Allow time for the tape to reach the same temperature as the material

underneath then measure the temperature of the tape or the painted surface.

Distance to Object in inches

Diameter of S

ot in inches

0.75” 1” 1.25”

6” 8” 10” 12”

1.5”

RH101-EU V3.0 11/07

Thermal Emissivity Table for Common Materials

Material Emissivity

Asphalt 0.90 to 0.98

Concrete 0.94

Cement 0.96

Sand 0.90

Earth 0.92 to 0.96

Water 0.67

Ice 0.96 to 0.98

Snow 0.83

Glass 0.85 to 1.00

Ceramic 0.90 to 0.94

Marble 0.94

Plaster 0.80 to 0.90

Mortar 0.89 to 0.91

Brick 0.93 to 0.96

Cloth (black) 0.98

Human skin 0.98

Lather 0.75 to 0.80

Charcoal (powder) 0.96

Lacquer 0.80 to 0.95

Lacquer (matt) 0.97

Rubber (black) 0.94

Plastic 0.85 to 0.95

Timber 0.90

Paper 0.70 to 0.94

Chromium oxides 0.81

Copper Oxides 0.78

Iron Oxides 0.78 to 0.82

Textiles 0.90

Maintenance

Cleaning and storage

1. The meter should be cleaned with a damp cloth and mild detergent when necessary.

Do not use solvents or abrasives.

2. Store the meter in an area with moderate temperature and humidity.

RH101-EU V3.0 11/07

Battery Replacement

The battery symbol appears on the lower right of the LCD when the 9V battery needs

to be replaced.

Replace the 9V battery as follows:

1. Turn the meter off and disconnect the air temperature probe.

2. Remove the large flat-head screw on the rear of the meter to remove the probe holder.

3. Remove the rubber holster that surrounds the entire meter by pulling it over the top of

the meter.

4. Remove the small Phillips head screw on the rear of the meter.

5. Open the battery compartment and replace the 9V battery.

6. Re-assemble the meter before operating.

You, as the end user, are legally bound (Battery ordinance) to return all used

batteries and accumulators; disposal in the household garbage is prohibited!

You can hand over your used batteries / accumulators, gratuitously, at the

collection points for our branches in your community or wherever batteries /

accumulators are sold!

Disposal

Follow the valid legal stipulations in respect of the disposal of the device at the

end of its lifecycle

WARNING: To avoid electric shock, do not operate the meter until the battery cover is in

place and fastened securely.

NOTE:: If your meter does not work properly, check the fuses and batteries to make sure that

they are still good and that they are properly inserted.

Calibration

A humidity calibration adjustment is located in the battery compartment.

1. Remove the battery door and move the battery to one side.

2. Place the humidity probe in a humidity chamber or humidity

calibration bottle and wait 20 minutes

3. Turn the meter on and turn the adjustment until the humidity reading

on the display agrees with the calibration source.

Battery

Compartment

Cal

Adjust

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