Greenlee TG-2000 Infrared and Contact Thermometer Instruction Manual

Introduction

This document is the instruction manual for the Greenlee TG-2000 Infrared and Contact Thermometer. It provides essential information for safe operation, maintenance, and understanding the features of the device.

The manual is available in English, Spanish, and French on the cover page, with the primary content in English.

Description

The Greenlee TG-2000 is a hand-held surface temperature sensing device. Its non-intrusive infrared measurement capability is safer and quicker than other methods, suitable for checking temperatures of circuit breakers, motors, HVAC/R equipment, engines, and more. It measures surface temperature by gathering emitted, transmitted, and reflected infrared energy.

Key Features:

• Dual laser sighting to indicate the approximate measurement area diameter.
• User-adjustable high and low temperature alarms.
• Automatic recording of maximum, minimum, difference, and average temperatures.
• Probe jack for K-type thermocouple contact temperature measurements.
• Lock mode for continuous measurements without holding the trigger.

Safety Information

Safety is paramount when using Greenlee tools and equipment. This manual and tool markings provide information to avoid hazards and unsafe practices. Always observe the provided safety information.

Hazard Definitions:

• DANGER: Immediate hazards that WILL result in severe injury or death if not avoided.
• WARNING: Hazards that COULD result in severe injury or death if not avoided.
• CAUTION: Hazards or unsafe practices that MAY result in injury or property damage if not avoided.

Specific Safety Precautions:

• ⚠️ Read and understand this material before operating or servicing. Failure to do so could result in serious injury or death.
• ⚡ Electric shock hazard: Do not use a thermocouple probe to measure the temperature of electrically energized objects (terminals, fuses, bare wires). Contact with live circuits can cause severe injury or death.
• ⚡ Electric shock and fire hazard: Do not expose the unit to rain or moisture. Do not use if wet or damaged. Use only for intended purpose.
• ⚡ Electric shock hazard: Do not open the case, except for the battery compartment. Before opening, release the trigger, unplug the probe, and shut off the unit.
• This unit is not intended for medical applications.
• ☢️ Laser hazard: DO NOT STARE INTO BEAM. Max Output <1 mW, Wavelength: 635-660 nm. Complies with 21 CFR, Chapter 1, Subchapter J. Avoid laser exposure. Do not point laser directly at eyes or reflective objects.
• ? Burn hazard: Avoid contact with the probe until it has cooled. Do not exceed the thermocouple probe's temperature rating.
• ⚡ Electric shock hazard: Do not attempt to repair the unit; it has no user-serviceable parts. Do not expose to extreme temperatures or humidity.
• Accuracy considerations: Readings may be inaccurate on highly reflective objects or if emissivity is not adjusted properly. Allow 30 minutes for ambient temperature stabilization. Clean the lens periodically.
• IMPORTANT: Avoid using near equipment generating electromagnetic interference (EMI). Protect against static electricity.

CE Certification

This instrument conforms to the following standards:

• EN50081-1:1992, Electromagnetic Emissions
• EN50082-1:1992, Electromagnetic Susceptibility

Readings may be affected by radio frequency electromagnetic fields (approx. 3 volts per meter), but performance will not be permanently affected. Maximum error from 200 to 600 MHz is 10 °C (18 °F).

Complies with CFR 21 1040.10 and 1040.11 (Performance Standards for Light-Emitting Products).

Identification

Unit Components:

1. Display
2. Decrease button and ℃/℉ selector
3. Mode selector
4. Increase button and Lock button
5. Probe jack
6. Trigger
7. Battery compartment door
8. Lens
9. Lasers

Display Icons:

• 11. Lock mode indicator ?
• 12. Full battery indicator ?
• 12A. Low battery indicator ?⬇️
• 12B. Dead battery indicator ??
• 13. Laser ON indicator ☢️
• 14. Backlight ON indicator ?
• 15. High/low alarm ON indicator ?
• 16. Scan mode indicator (blinks when reading is updated) ?
• 17. Celsius or Fahrenheit indicator ℃ / ℉
• 18. Hold mode indicator ⏸️
• 19. Temperature indicator
• 20. Mode value indicator
• 21. Mode indicator

Symbols on the Unit:

• ⚠️ Warning—Read the instruction manual.
• ♻️ Recycle product in accordance with manufacturer's directions.
• ☢️ Laser radiation is emitted from this unit.

Using the Features

Basic Features:

• Laser On/Off: Press and hold the trigger, then momentarily press the ▼ button.
• Backlight On/Off: Press and hold the trigger, then momentarily press the ▲ button.
• Change ℃/℉: If the LCD is blank, press and release the trigger, then momentarily press the ℃/℉ button.
• Lock Trigger: If the LCD is blank, press and release the trigger. Momentarily press the Lock button. Press again to return to normal measurement. Auto-exits Lock mode after 60 minutes.

Advanced Features:

Press the Mode button to access features in this order: Emissivity Display (E), Emissivity Setting (↓↑), Maximum (MAX), Minimum (MIN), Difference (dIF), Average (AVG), High Alarm Limit (HAL), Low Alarm Limit (LAL), and Probe (PRB).

Setting Alarm Points:

After selecting HAL or LAL mode, use the ▼ or ▲ button to set the alarm point. A tone and flashing alarm indicator will signal if the temperature is higher or lower than the set point (“HI” or “LOW” will appear).

Temperature Probe:

Connect a K-type thermocouple probe (sold separately) to the probe jack. Select PRB mode. The probe temperature appears in the lower right corner of the display, while the infrared sensor temperature remains in the center. The probe does not trigger high/low alarms.

Measurement Review:

After the unit shuts off, press Mode to review readings:

• MAX: Highest recorded temperature.
• MIN: Lowest recorded temperature.
• dIF: Difference between MAX and MIN.
• AVG: A weighted rolling average of readings.

Note: MAX, MIN, dIF, and AVG values reset when the trigger is pressed. AVG smooths data and excludes spikes.

Distance from Target

The thermometer measures surface temperature by sensing infrared energy from the target's spot size. The spot size increases with distance. For accuracy, the spot size should be smaller than the target area, ideally half the size for critical measurements. A spot size larger than the target can lead to inaccurate readings by including background temperatures.

Diagram Description: Object 1 is at the correct distance, with the target slightly larger than the spot size. Object 2 is too far, with the target smaller than the spot size, leading to background measurement.

Distance to Spot Size:

The TG-2000 has a nominal distance-to-spot-size (D:S) ratio of 16:1.

Diagram Description: Shows D:S=16:1 with examples: 8in @ 128in, 4in @ 64in, 2in @ 32in, and metric equivalents 0.2m @ 3.2m, 0.1m @ 1.6m, 0.05m @ 0.8m, illustrating nominal spot diameter at 90% energy.

Operation

CAUTION: LASER RADIATION—DO NOT STARE INTO BEAM. CLASS 2 LASER PRODUCT.

1. Refer to "Typical Measurements" for specific instructions.
2. Test the unit on an object with a known temperature. If it doesn't function as expected, replace batteries.
3. To measure a selected area: Press and hold the trigger, point at the object. Dual lasers indicate the area diameter. "SCAN," the measured temperature, and advanced data appear. The scan icon blinks. Release the trigger; "HOLD," final temperature, and data remain for 1 minute.
4. For multiple measurements or locating a hot spot: Press and hold the trigger, scan objects. The unit records MAX, MIN, dIF, and AVG temperatures.

Refer to "Advanced Features" in "Using the Features" for other functions.

Limitations:

• Cannot measure through transparent objects (glass, plastic); measures surface temperature of the object itself.
• Steam, dust, or smoke can obstruct the infrared sensor and prevent accurate measurements.

Locating a Hot Spot:

Aim the thermometer outside the area of interest and scan across with an up and down motion.

Troubleshooting

Typical Measurements

Diagram Description:

• Electronics: Shows thermometer measuring a circuit board.
• Power Distribution: Shows thermometer measuring an electrical panel.
• HVAC: Shows thermometer measuring an HVAC unit. Notes: Minimum line width of 25 mm (1") for accurate reading; Non-insulated line.

Emissivity

Emissivity is an object's ability to emit infrared energy. Most surfaces have an emissivity of about 0.95. Shiny metallic surfaces have lower emissivity, which can lead to inaccurate infrared thermometer readings.

CAUTION: Temperature readings are inaccurate on highly reflective objects or if emissivity is not adjusted properly. Follow masking and emissivity adjustment procedures.

Masking a Surface to Determine Emissivity:

To assess emissivity effects, cover the surface with masking tape or flat black paint (ensure it withstands anticipated temperature). These materials have an emissivity of about 0.95. Allow time for the covering to reach the material's temperature. Measure the covered area and a nearby area; readings should be similar. Differences may indicate emissivity effects.

Compensating for Emissivity:

• If surface temperature is known, adjust emissivity until the unit agrees with the known temperature.
• If material is known, adjust emissivity per the "Common Emissivities" table.
• Otherwise, mask the surface, set emissivity to 0.95, measure masked and unmasked areas, and adjust emissivity until temperatures agree. Record this value for future use.

Common Emissivities:

*oxidized, **opaque, over 0.51 mm (0.0020") thick, ***natural

Accuracy

Accuracy Table for Infrared Sensor:

Accuracy for K-Type Thermocouple Measurements:

Instrument error is ± 1.0% of reading or ± 1 °C (1.8 °F), whichever is greater. Specification applies at ambient temperature of 17 °C to 29 °C (63 °F to 84 °F). Thermocouple range or accuracy not included. Consult thermocouple probe data sheet for usable temperature range and accuracy specification.

Specifications

• Display: 4-digit LCD (999.9 or 9999 maximum display)
• Response Time: 1 second, 90% response
• Temperature Range:
  • Infrared Sensor: -60 °C to 625 °C (-76 °F to 1157 °F)
  • K-Type Thermocouple Probe: -64 °C to 1400 °C (-83.2 °F to 2552 °F)
• Spectral Response: 8 to 14 µm
• Repeatability: ± 0.5% of reading or ± 1 °C (± 2 °F), whichever is greater
• Emissivity: 0.10 to 1.0, digitally adjustable
• Ambient Operating Temperature Range: 0 °C to 50 °C (32 °F to 122 °F)*
• Relative Humidity: 10% to 90% (non-condensing) at < 30 °C (86 °F) ambient temperature
• Altitude: 2000 m (6500') maximum
• Storage Conditions: -10 °C to 60 °C (14 °F to 140 °F)*. Remove batteries.
• Battery: Two 1.5 volt batteries (AAA, NEDA 24A or IEC LR03)

*For improved accuracy, allow unit 30 minutes to adjust to large change in temperature.

Statement of Conformity:

Greenlee Textron Inc. is certified in accordance with ISO 9001 (2000) for its Quality Management Systems. The instrument has been checked and/or calibrated using equipment traceable to the National Institute for Standards and Technology (NIST).

Maintenance

CAUTION: Electric shock hazard: Do not attempt to repair this unit. It contains no user-serviceable parts.

Battery Replacement:

1. Pivot the top of the door down and away from the handle.
2. Replace the batteries (observe polarity).
3. Close the battery compartment door.

Cleaning:

Lens:

1. Blow off loose particles using clean compressed air.
2. Gently brush any remaining debris away with a camel hair brush or soft cloth.
3. Carefully wipe the surface with a water-moistened cotton swab.

Note: Do not use solvents!

Housing:

Periodically wipe the housing with a damp cloth and mild detergent; do not use abrasives or solvents.