Greenlee TG-2000 Infrared and Contact Thermometer
Brand: Greenlee
Manufacturer: Greenlee Textron Inc.
Description
The Greenlee TG-2000 Infrared and Contact Thermometer is a handheld surface temperature sensing device. Its non-intrusive measuring capability is safer and quicker than other methods, making it well-suited for checking the surface temperature of circuit breakers, motors, HVAC/R equipment, engines, and more. This device measures surface temperature by gathering three forms of infrared energy—emitted, transmitted, and reflected—from an object and translating that energy into a temperature reading.
Key features include:
- Dual laser sighting: Two lasers indicate the approximate diameter of the measurement area.
- User-adjustable high and low temperature alarms.
- Automatic recording of maximum, minimum, difference, and average temperatures during measurements.
- Probe jack: Allows the thermometer to measure contact temperature using any K-type thermocouple with a standard mini connector.
- Lock mode: Enables long-term measurements without holding the trigger. Lasers turn off in Lock mode unless the trigger is held down.
Safety Information
Safety is essential in the use and maintenance of Greenlee tools and equipment. This manual and tool markings provide information for avoiding hazards and unsafe practices. Observe all provided safety information.
SAFETY ALERT SYMBOL: This symbol (⚠️) calls attention to hazards or unsafe practices that could result in injury or property damage. The signal word indicates the severity of the hazard, and the message provides information for prevention.
- DANGER: Immediate hazards that, if not avoided, WILL result in severe injury or death.
- WARNING: Hazards that, if not avoided, COULD result in severe injury or death.
- CAUTION: Hazards or unsafe practices that, if not avoided, MAY result in injury or property damage.
General Safety: ⚠️ Read and understand this material before operating or servicing this equipment. Failure to understand how to safely operate this tool could result in an accident causing serious injury or death.
Electric shock hazard: ⚠️ Do not use a thermocouple probe to measure the temperature of electrically energized objects such as terminals, fuses, or bare wires. Contact with live circuits could result in severe injury or death.
Electric shock and fire hazard: ⚠️
- Do not expose this unit to rain or moisture.
- Do not use the unit if it is wet or damaged.
- Use this unit only for its intended purpose as described in this manual. Any other use can impair the unit's protection.
Failure to observe these warnings could result in severe injury or death.
Electric shock hazard: ⚠️
- Do not open the case, except for the battery compartment.
- Before opening the case, release the trigger, unplug the thermocouple probe, and shut off the unit.
Failure to observe these warnings could result in severe injury or death.
Medical Applications: ⚠️ This unit is not intended for medical applications. Failure to observe this warning could result in severe injury or death.
Laser hazard: ⚠️
- Avoid laser exposure.
- Do not point laser directly at eyes or at reflective objects.
Failure to observe these precautions may result in injury.
Laser Radiation Information:
- LASER RADIATION - DO NOT STARE INTO BEAM.
- Max. Output <1 mW, Wavelength: 635-660 nm.
- Complies with 21 CFR, Chapter 1, subchapter J.
- CLASS 2 LASER PRODUCT.
- CLASS II LASER PRODUCT.
- CAUTION - CLASS 2 LASER RADIATION WHEN OPEN.
Burn hazard: ⚠️
- Avoid contact with the probe until it has cooled. The thermocouple probe may remain hot for several minutes after making a temperature measurement.
- Do not exceed the temperature rating of the thermocouple probe. Consult the manufacturer's specifications for the selected probe.
Failure to observe these precautions may result in injury and can damage the unit.
Electric shock hazard: ⚠️
- 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. Refer to “Specifications.”
Failure to observe these precautions may result in injury and can damage the unit.
Measurement Accuracy: ⚠️
- Temperature readings will be inaccurate on highly reflective objects.
- Temperature readings will be inaccurate on objects if emissivity is not adjusted properly. Follow masking and emissivity adjustment 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. Refer to the “Maintenance” section.
Failure to observe these precautions may result in injury and can damage the unit.
IMPORTANT:
- Using this unit near equipment that generates electromagnetic interference can result in unstable or inaccurate readings.
- Protect the unit against static electricity.
Purpose of this Manual
This instruction manual is intended to familiarize all personnel with the safe operation and maintenance procedures for the Greenlee TG-2000 Infrared and Contact Thermometer. Keep this manual available to all personnel.
♻️ Do not discard this product or throw away!
All specifications are nominal and may change as design improvements occur. Greenlee Textron Inc. shall not be liable for damages resulting from misapplication or misuse of its products.
Identification
The Greenlee TG-2000 Infrared and Contact Thermometer has the following parts:
- 1. Display: The screen showing readings and indicators.
- 2. Decrease button and °C/°F selector: Used to decrease values and switch between Celsius and Fahrenheit.
- 3. Mode selector: Cycles through different measurement modes and features.
- 4. Increase button and Lock button: Used to increase values and engage/disengage the trigger lock.
- 5. Probe jack: Port for connecting a K-type thermocouple probe.
- 6. Trigger: Activates the thermometer and laser.
- 7. Battery compartment door: Located on the handle.
- 8. Lens: The infrared sensor opening at the front.
- 9. Lasers: Two laser dots emitted from the front to indicate the measurement spot.
Display Icons:
- 11. Lock mode indicator: Shows when the trigger lock is active.
- 12. Full battery indicator: Shows full battery charge.
- 12A. Low battery indicator: Alerts when battery is low.
- 12B. Dead battery indicator: Indicates battery needs immediate replacement.
- 13. Laser ON indicator: Shows when the laser pointers are active.
- 14. Backlight ON indicator: Indicates the display backlight is on.
- 15. High/low alarm ON indicator: Shows when temperature alarms are set.
- 16. Scan mode indicator: Blinks when a reading is being updated.
- 17. Celsius or Fahrenheit indicator: Shows the selected temperature unit.
- 18. Hold mode indicator: Indicates the last reading is being held.
- 19. Temperature indicator: Shows the measured temperature.
- 20. Mode value indicator: Displays the value for the selected mode (e.g., MAX, MIN).
- 21. Mode indicator: Shows the current measurement mode (e.g., MAX, MIN, AVG).
Symbols on the Unit:
- ⚠️ Warning: Read the instruction manual.
- ♻️ Recycle: Recycle product in accordance with manufacturer's directions.
- Laser radiation: Laser radiation is emitted from this unit.
Using the Features
Basic Features
- Turn Laser On/Off: Press and hold the trigger, then momentarily press the 'Decrease' (▼) button.
- Turn Backlight On/Off: Press and hold the trigger, then momentarily press the 'Increase' (▲) button.
- Change °C/°F: If the LCD is blank, press and release the trigger, then momentarily press the '°C/°F' button.
- Lock Trigger for Continuous Measurement: If the LCD is blank, press and release the trigger, then momentarily press the 'Lock' button. Press the 'Lock' button again to return to normal measurement. The unit automatically exits Lock mode after 60 minutes.
Advanced Features
Press the 'Mode' button to access advanced 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 'Decrease' (▼) or 'Increase' (▲) button to set the alarm point. A tone will sound and the alarm indicator will flash if the temperature is higher or lower than the set point. "HI" or "LOW" will appear with the alarm indicator.
Temperature Probe
To use a K-type thermocouple temperature probe (purchased separately), connect it to the probe jack. Select PRB mode. The probe temperature appears in the lower right corner of the display, while the infrared sensor temperature appears in the center. The probe will not trip the high/low alarms.
Measurement Review
After the unit shuts off, press 'Mode' to review measurements:
- MAX: The highest recorded temperature.
- MIN: The lowest recorded temperature.
- dIF: The difference between MAX and MIN readings.
- AVG: A weighted rolling average of all readings.
Note: MAX, MIN, dIF, and AVG values reset each time the trigger is pressed. The AVG feature filters fluctuations, providing a smoothed reading.
Distance from Target
Thermometers measure surface temperature by sensing emitted, reflected, and transmitted infrared energy. The sensor collects this energy from the measured area (spot size), which varies with distance. The farther the distance, the larger the spot size.
For accurate measurements, the spot size should be somewhat smaller than the target area. When accuracy is critical, the spot size should be half the target area. If the spot size is larger than the target, the thermometer may measure background temperature, leading to inaccurate readings.
The diagram shows two scenarios:
- Object 1: The thermometer is at the correct distance. The target area is slightly larger than the laser spot size, ensuring accurate measurement of the object itself.
- Object 2: The thermometer is too far away. The laser spot size is larger than the target, causing the thermometer to measure background temperature, resulting in an inaccurate reading.
Distance to Spot Size Ratio
The distance-to-spot-size (D:S) ratio indicates the appropriate distance for measurement. The nominal D:S ratio for the TG-2000 is 16:1.
Graphic: Distance (D) to Spot size (S) D:S=16:1
This graphic illustrates the relationship, showing examples like:
- 8 inches spot size at 128 inches distance
- 4 inches spot size at 64 inches distance
- 2 inches spot size at 32 inches distance
- 0.2 meters spot size at 3.2 meters distance
- 0.1 meters spot size at 1.6 meters distance
- 0.05 meters spot size at 0.8 meters distance
Nominal Spot Diameter at 90% Energy.
Operation
CAUTION: LASER RADIATION
- DO NOT STARE INTO BEAM.
- Max. Output <1 mW, Wavelength: 635-660 nm.
- Complies with 21 CFR, Chapter 1, subchapter J.
- CLASS 2 LASER PRODUCT.
- CLASS II LASER PRODUCT.
- CAUTION - CLASS 2 LASER RADIATION WHEN OPEN.
- Refer to "Typical Measurements" for specific measuring instructions.
- Test the unit on an object with a known temperature. If it does not function as expected, replace the batteries.
- To measure temperature of a selected area: Press and hold the trigger and point the thermometer at the object. The dual lasers indicate the approximate measurement area diameter. "SCAN," the measured temperature, and advanced feature data will appear on the display. The scan icon will blink. Release the trigger after measurement. "HOLD," the final temperature, and feature data will remain on display for 1 minute.
- To take multiple measurements or locate a hot spot: Press and hold the trigger, and scan the objects. The unit will record maximum, minimum, difference, and average temperatures.
For other functions, refer to "Advanced Features" in the "Using the Features" section.
Limitations
- The thermometer cannot measure through transparent objects (e.g., glass, plastic). It measures the surface temperature of the transparent material itself.
- Steam, dust, smoke, or other particles can obstruct the infrared sensor and prevent accurate measurement.
Locating a Hot Spot
To find a hot spot, aim the thermometer outside the area of interest and scan across with an up and down motion.
Troubleshooting
| Code | Problem | Action |
|---|---|---|
| Er2 | Thermometer has been exposed to rapid temperature change. | Allow at least 30 minutes for the thermometer to stabilize at the new ambient temperature. |
| Er3 | Ambient temperature is outside operating limits (refer to "Specifications"). | Operate thermometer within limits specified in the "Specifications" section. |
| Er5 ~ 9 | Other errors. | Reset thermometer by removing batteries for at least 1 minute. Reinstall batteries and check operation. |
| HI | Measured temperature is above the thermometer's range. | Use thermometer within its specified range. |
| LO | Measured temperature is below the thermometer's range. | Use thermometer within its specified range. |
Typical Measurements
The TG-2000 is suitable for various applications:
- Minimum width of line is 25 mm (1") for accurate reading.
- Suitable for non-insulated lines.
Emissivity
Emissivity is the ability of an object to emit infrared energy. Most objects have an emissivity value of about 0.95. Polished or shiny metallic surfaces may have much lower emissivity, leading to inaccurate temperature measurements with an infrared thermometer.
CAUTION:
- Temperature readings will be inaccurate on highly reflective objects.
- Temperature readings will be inaccurate on objects if emissivity is not adjusted properly. Follow masking and emissivity adjustment procedures.
Failure to observe these precautions may result in injury and can damage the unit.
Masking a Surface to Determine Emissivity
To determine the effect of emissivity on measurement, cover the surface with masking tape or flat black paint (ensure tape/paint can withstand the anticipated temperature). The emissivity of these materials is about 0.95. Allow time for the tape/paint to reach the material's temperature. Measure the covered area and a nearby area. Readings should be similar; if not, emissivity may affect measurements.
Compensating for Emissivity
- If the surface temperature is known, adjust emissivity until the unit agrees with the known temperature.
- If the material is known, adjust emissivity according to the Common Emissivities table.
- Otherwise, mask the surface as described above. Measure the masked area with emissivity set at 0.95. Measure the unmasked surface and adjust emissivity until temperatures agree. Record the emissivity value for future readings.
Common Emissivities
| Material | Emissivity | Material | Emissivity |
|---|---|---|---|
| Aluminum | 0.30 | Iron* | 0.70 |
| Asbestos | 0.95 | Lead* | 0.50 |
| Asphalt | 0.95 | Limestone | 0.98 |
| Basalt | 0.70 | Oil | 0.94 |
| Brass* | 0.50 | Paint | 0.93 |
| Brick | 0.90 | Paper | 0.95 |
| Carbon | 0.85 | Plastic** | 0.95 |
| Ceramic | 0.95 | Rubber | 0.95 |
| Concrete | 0.95 | Sand | 0.90 |
| Copper* | 0.95 | Snow | 0.90 |
| Dirt | 0.94 | Steel* | 0.80 |
| Food (frozen) | 0.90 | Textiles | 0.94 |
| Food (hot) | 0.93 | Water | 0.93 |
| Glass (plate) | 0.85 | Wood*** | 0.94 |
| Ice | 0.98 |
*oxidized
**opaque, over 0.51 mm (0.0020") thick
***natural
Accuracy
Accuracy Table for Infrared Sensor
| Target Temperature | Ambient Temperature | Accuracy |
|---|---|---|
| 15 °C to 35 °C | 25 °C | ± 1.0 °C |
| -60 °C to 0 °C | 20 °C to 26 °C | ± (2.0-0.05 x reading) °C |
| 0 °C to 625 °C | ± 2.0% of reading or 2 °C, whichever is greater | |
| 59 °F to 95 °F | 77 °F | ± 1.8 °F |
| -76 °F to 32 °F | 73 °F to 79 °F | ± (5.2-0.05 x reading) °F |
| 32 °F to 1157 °F | ± 2.0% of reading or 4 °F, whichever is greater |
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 our Quality Management Systems.
The instrument enclosed has been checked and/or calibrated using equipment that is traceable to the National Institute for Standards and Technology (NIST).
Maintenance
Electric shock hazard: ⚠️ Do not attempt to repair this unit. It contains no user-serviceable parts. Failure to observe this precaution may result in injury and can damage the unit.
Battery Replacement
- Pivot the top of the door down and away from the handle.
- Replace the batteries (observe polarity).
- Close the battery compartment door.
Cleaning
Lens
- Blow off loose particles using clean compressed air.
- Gently brush any remaining debris away with a camel hair brush or soft cloth.
- 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.
