Greenlee THH-500 User manual

INSTRUCTION MANUAL
999 3291.1 © 2001 Greenlee Textron IM 1429 REV 1 2/01
THH-500
NON-CONTACT
INFRARED THERMOMETER
TERMÓMETRO INFRARROJO
SIN CONTACTO DIRECTO
THERMOMETRE INFRAROUGE
SANS CONTACT
INSTRUCTION MANUAL
MANUAL DE INSTRUCCIONES
MANUEL D’INSTRUCTIONS
Read and understand all of the instructions and safety
information in this manual before operating or servicing this tool.
Lea y entienda todas las instrucciones y la información sobre
seguridad que aparecen en este manual, antes de manejar estas
herramientas o darles mantenimiento.
Lire attentivement et bien comprendre toutes les instructions et
les informations sur la sécurité de ce manuel avant d‘utiliser ou de
procéder à l‘entretien de cet outil.

2
Description
The Greenlee THH-500 is a hand-held, non-contact, surface temperature sensing device. The
non-contact measuring capability of this unit is safer and quicker than other methods, and is
well suited to checking the surface temperature of circuit breakers, motors, HVAC equipment,
engines, etc.
The unit measures surface temperature by gathering three forms of infrared energy —
emitted, transmitted, and reflected energy — from an object and translating that energy into a
temperature.
The unit has a laser to assist in aiming. The display is backlit for easier reading.
Safety
Safety is essential in the use and maintenance of Greenlee tools and equipment. This
instruction manual and any markings on the tool provide information for avoiding hazards and
unsafe practices related to the use of this tool. Observe all of the safety information provided.
Purpose
This instruction manual is intended to familiarize all personnel with the safe operation and
maintenance procedures for the Greenlee THH -500.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
and are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL

THH-500
3
Important Safety Information
• This unit is not intended for medical applications.
• Use this unit for manufacturer’s intended purpose only, as described in this manual.
Failure to observe these warnings can result in severe injury or death.
This symbol is used to call your attention to hazards or unsafe practices which could
result in an injury or property damage. The signal word, defined below, indicates the
severity of the hazard. The message after the signal word provides information for
preventing or avoiding the hazard.
SAFETY ALERT SYMBOL
Immediate hazards which, if not avoided, WILL result in severe injury or death.
Hazards which, if not avoided, COULD result in severe injury or death.
Hazards or unsafe practices which, if not avoided, MAY result in injury or property
damage.
Read and understand this material before operating or servicing
this equipment. Failure to understand how to safely operate this
tool can result in an accident causing serious injury or death.

4
Important Safety Information
• Do not open the case, except the battery compartment.
• Before opening the case, release the ON button.
Failure to observe these precautions can result in injury and can damage the unit.
• Do not use the unit if it is wet or damaged.
• Do not expose this unit to rain or moisture.
Failure to observe these precautions can result in injury and can damage the unit.
AVOID EXPOSURE –
LASER RADIATION IS
EMITTED FROM THIS
APERTURE. LASER RADIATION – DO
NOT STARE INTO BEAM
OUTPUT < 1 mW
WAVELENGTH 630-670 nm
CLASS II LASER PRODUCT
COMPLIES WITH
FDA 21 CFR
SUBCHAPTER J
CAUTION
< 1 mW/630–670 nm
IEC 825/93
LASER LIGHT
DO NOT STARE INTO BEAM
CLASS 2 LASER
• Do not attempt to repair this unit. It contains no user-serviceable parts.
• Do not expose the unit to extremes in temperature or high humidity.
See Specifications.
Failure to observe these precautions can result in injury and can damage the unit.

THH-500
5
Important Safety Information
Using this unit near equipment that generates electromagnetic interference can result
in unstable or inaccurate readings.
• Temperature readings will be inaccurate on highly reflective objects; follow masking
procedures.
• Allow 30 minutes for the unit to adjust to large changes in ambient temperature;
inaccurate readings can result.
• Clean lens periodically; inaccurate readings can result. See the Maintenance section.
Failure to observe these precautions can result in injury or property damage.
Laser hazard:
• Avoid laser exposure.
• Do not point laser directly at eye or at reflective objects.
Failure to observe these precautions can result in injury.
CE Certification
This instrument conforms to the following standards:
• EN50081-1:1992, Electromagnetic Emissions
• EN50082-1:1992, Electromagnetic Susceptibility
• EN60825-1:1994, Safety of Laser Products
Tests were conducted using a frequency range of 27 to 500 MHz with the instrument in three
orientations. The average error for the three orientations is ±1.0 °C at 3 v/m throughout the
spectrum. However, between 230 MHz and 500 MHz at 3 v/m, the instrument may not meet its
stated accuracy.
CFR 21
Performance Standards for Light-Emitting Products

6
Identification
1. Sensor
2. Laser
3. Display
4. On Button
5. Battery Case
6. Celsius/Fahrenheit Selector
Display Icons
7. HOLD Reading remains on display for 7
seconds after button is released.
8. Low Battery
9. °F Fahrenheit reading is enabled.
10. °C Celsius reading is enabled.
Symbols on the Unit
Laser radiation is emitted from this unit.
12
3
4
5
6
7
8
9
10

THH-500
7
Operation
Troubleshooting
Code Problem Action
—Target temperature is Select target within unit’s specifications
over or under range
Battery icon Battery is low Replace battery
Blank display Battery is dead Replace battery
Laser won’t work Low or dead battery Replace battery
1. See Typical Measurements for specific measuring instructions.
2. Test the unit on an object with a known temperature.
• If the unit does not function as expected on an object of known temperature, replace
the battery.
• If the unit still does not function as expected, send the unit to Greenlee for repair.
3. Point the temperature sensor at the object to be measured. Press the On Button. The
temperature reading (C°or F°) will appear on the display.
4. Release the On Button. “Hold” will appear to indicate that the unit is holding the last
recorded temperature on the display. The reading will remain for 7 seconds.
Locating a Hot Spot
To find a hot spot, aim the thermometer outside the area of interest then scan across with an
up and down motion.
AVOID EXPOSURE –
LASER RADIATION IS
EMITTED FROM THIS
APERTURE. LASER RADIATION – DO
NOT STARE INTO BEAM
OUTPUT < 1 mW
WAVELENGTH 630-670 nm
CLASS II LASER PRODUCT
COMPLIES WITH
FDA 21 CFR
SUBCHAPTER J
CAUTION
< 1 mW/630–670 nm
IEC 825/93
LASER LIGHT
DO NOT STARE INTO BEAM
CLASS 2 LASER

8
Typical Measurements
Electronics
HVAC
Power Distribution
• Minimum width of
line is 25 mm (1")
for accurate reading
• Non-insulated line

THH-500
9
Distance from Target
Temperature sensors measure the surface temperature of an object by sensing its emitted,
reflected and transmitted energy. The sensor collects this energy from the area being
measured (spot size). The spot size varies as the distance to the target changes. The farther
the distance from the from the area being targeted, the larger the spot size.
When determining the appropriate distance from the object, the spot size must be somewhat
smaller than the target area. When accuracy is critical, the spot size should be half as large as
the target. If the spot size is larger than the target size, the thermometer will pick up the
temperature of the background, resulting in inaccurate readings.
Object 1 is the correct distance from the unit. Note the target is slightly larger than the spot
size being measured.
Object 2 is too far away. The thermometer also measures the background because the target is
smaller than the instrument’s spot size. This can result in an inaccurate reading.
S
D
25 mm @
150 mm 50 mm @ 300 mm 100 mm @ 600 mm
1" @
6" 2" @ 12" 4" @ 24"
D6
S 1
=
Note: The distance-to-spot size ratio (D:S) is outlined in the diagram on the battery
compartment cover.
12

10
Emissivity
Emissivity is the ability of an object to emit infrared energy. Most objects or surfaces have an
emissivity value of about 0.95. This is the preset emissivity value of the THH-500.
Some objects, such as polished or shiny metallic surfaces, may have much lower emissivity.
Using a temperature sensor to measure the temperature of such objects will produce
inaccurate results.
To determine the effect of emissivity on the measurement, cover the surface with masking tape
or flat black paint. (Be sure to use tape or paint that can withstand the anticipated temperature.
The emissivity of both these materials is about 0.95. Allow time for the tape or paint to reach
the temperature of the material underneath. Measure the covered area and a nearby area. The
readings should be about the same. If they are not, emissivity may affect your measurements.
Accuracy
Accuracy Table
Degrees Celsius Degrees Fahrenheit Accuracy
100 to 260 212 to 500 ±2%
25 to 100 77 to 212 ±2 °C (±3 °F)
–1 to 25 30 to 77 ±3 °C (±5 °F)
–18 to –1 0 to 30 ±4 °C (±7 °F)
Temperature readings will be inaccurate on highly reflective objects. Follow masking
procedures.
Failure to observe this precaution can result in injury or property damage.