HABOTEST HT651D Infrared Thermometer User Manual

Introduction

The infrared thermometer is suitable for non-contact temperature measurement. The thermometer determines the surface temperature of the object by measuring the infrared energy of the radiation from the surface of the object.

Before using the instrument, please read this manual carefully, and save it well for future using.

Figure 1: HABOTEST HT651D Infrared Thermometer with key features.

Figure 2: Key features of the HT651D thermometer.

Safety Operation Specifications

WARNING

To prevent eye injury or personal injury:

• Please read the manual carefully before using the product.
• Please do not look at the laser directly. Do not direct laser direct to humans or animals or indirectly from the reflecting surface.
• If the instrument works abnormally, do not use.
• Do not use optical tools (such as binocular, telescope, microscope, etc.) to look directly at the laser. Optical tools may focus on lasers, thereby damaging the eyes.
• Replace battery when indication of battery power is insufficient, so as to prevent measurement error.
• Do not use products in the environment of explosive gas, water vapor or dust.
• For actual temperature, please refer to the emissivity information. Reflective objects will cause the measured temperature to be lower than the actual temperature. These objects are dangerous to burn.
• Do not put the thermometer near or put it on a high temperature object.
• Please be sure to use the meter according to the regulations, otherwise the protection function provided by the product may be weakened.
• Do not use a solvent cleaning thermometer.

Caution

To avoid damaging the thermometer or the tested equipment, please protect it from the following effects:

• Electromagnetic field and static electricity of arc welding machine, induction heater and other equipment.
• Thermal shock (when a sudden change in ambient temperature occurs, the thermometer must be placed in the environment for 30 minutes to stabilize the thermometer).
• Do not put the thermometer near or put it on a high temperature object.
• Keep the thermometer clean and avoid dust entering the barrel.

Symbolic Description

Component Description

Figure 3: Appearance and Function Button Instructions.

1. Alarm indicator
2. LCD display
3. Laser key / digital adjusting control key (decreases)
4. Mode key
5. °C/°F (UV light control) / digital regulation (increase key)
6. Laser
7. UV lights
8. Infrared sensor induction zone
9. Measure Trigger Switch
10. Battery cover
11. Thermocouple socket

LCD Description

Figure 4: Display Screen Description.

1. Ambient temperature
2. Relative humidity
3. Dew point temperature
4. Non-contact temperature
5. Laser on indicator
6. Fahrenheit unit
7. Thermocouple
8. Celsius unit
9. Measuring indicator
10. Emittance display
11. Low battery indicator
12. Data hold indicator

Setting

Emittance Setting:

1. Press the MODE key and hold it for more than 2 seconds. The instrument goes into the setting state.
2. At this time, the instrument emittance display area flickers.
3. Press the ▲/▼ key to increase or decrease the setting value, and long press to quickly increase or decrease the setting value.
4. After setting, press the MODE key and hold it for more than 2 seconds or press the trigger switch to exit the setting state, or press the MODE key (< 1 second) to the next setting.

Alarm Upper Limit Setting:

1. Press the MODE key and hold it for more than 2 seconds. The instrument goes into the setting state.
2. Press the MODE key (< 1 second) to switch to the alarm upper limit setting state and the instrument displays the "HI" character. And display the current alarm upper limit value.
3. Press the ▲/▼ key to increase or decrease the setting value, and long press to quickly increase or decrease the setting value.
4. After setting, press the MODE key and hold it for more than 2 seconds or press the trigger switch to exit the setting state, or press the MODE key (< 1 second) to the next setting.

Alarm Lower Limit Setting:

1. Press the MODE key and hold it for more than 2 seconds. The instrument goes into the setting state.
2. Press the MODE key (< 1 second) to switch to the alarm lower limit setting state and the instrument displays the "Lo" character. And display the current alarm lower limit value.
3. Press the ▲/▼ key to increase or decrease the setting value, and long press to quickly increase or decrease the setting value.
4. After setting, press the MODE key and hold it for more than 2 seconds or press the trigger switch to exit the setting state, or press the MODE key (< 1 second) to the next setting.

Temperature Difference Alarm Value Setting (Infrared Temperature and Ambient Temperature):

1. Press the MODE key and hold it for more than 2 seconds. The instrument goes into the setting state.
2. Press MODE key (< 1 second) to switch to the temperature difference alarm value setting state of infrared temperature and ambient temperature. The instrument displays the "dIF °C AL" logo and displays the temperature difference alarm value.
3. Press the ▲/▼ key to increase or decrease the setting value, and long press to quickly increase or decrease the setting value.
4. After setting, press the MODE key and hold it for more than 2 seconds or press the trigger switch to exit the setting state, or press the MODE key (< 1 second) to the next setting.

Temperature Difference Alarm Value Setting (Infrared Temperature and Dew Point Temperature):

1. Press the MODE key and hold it for more than 2 seconds. The instrument goes into the setting state.
2. Press MODE key (< 1 second) to switch to the temperature difference alarm value setting state of infrared temperature and dew point temperature. The instrument displays the "dIF °C AL" logo and displays the temperature difference alarm value.
3. Press the ▲/▼ key to increase or decrease the setting value, and long press to quickly increase or decrease the setting value.
4. After setting, press the MODE key and hold it for more than 2 seconds or press the trigger switch to exit the setting state, or press the MODE key (< 1 second) to the next setting.

Temperature Difference Alarm Value Setting (Infrared Temperature and Thermocouple Temperature):

1. Press the MODE key and hold it for more than 2 seconds. The instrument goes into the setting state.
2. Press MODE key (< 1 second) to switch to the temperature difference alarm value setting state of infrared temperature and thermocouple temperature. The instrument displays the "dIF °C AL J" logo and displays the temperature difference alarm value.
3. Press the ▲/▼ key to increase or decrease the setting value, and long press to quickly increase or decrease the setting value.
4. After setting, press the MODE key and hold it for more than 2 seconds or press the trigger switch to exit the setting state, or press the MODE key (< 1 second) to the next setting.

Operating Instructions

Turn On or Off Lasers:

Press the Laser key (< 1 second) to turn on or off the laser. When the laser is turned on, the display screen will show "Laser Activation Indicator".

Turn On or Off UV Lights:

Press the C/F key (>2 seconds) to turn on or off the ultraviolet lamp for fluorescence leak detection.

Temperature Unit Shift:

Press the C/F key (< 1 second) to switch temperature units.

Figure 5: High-Definition Color Screen Backlight and Temperature Unit Conversion.

1st Measurement Function (without thermocouple):

1. Turn on the power to enter the first function measurement (without thermocouple). This function includes ambient temperature, humidity, dew point temperature, and infrared temperature.
2. Press and hold the trigger switch to start measurement, release the trigger to stop measurement.
3. Press the MODE key (< 1 second) to enter the next measurement function.

1st Measurement Function (with thermocouple):

1. Turn on the power to enter the first function measurement (with thermocouple). The thermocouple symbol and thermocouple temperature display area will flash 3 times to indicate that the thermocouple probe has been inserted. This function includes ambient temperature, humidity, thermocouple temperature, and infrared temperature.
2. Press and hold the trigger switch to start measurement, release the trigger to stop measurement.
3. Press the MODE key (< 1 second) to enter the next measurement function.

Figure 6: Thermocouple Temperature Measurement and Ergonomic Design.

2nd Measurement Function (Upper and Lower Limit Alarm Measurement):

1. After power on, press the MODE key (< 1 second) to switch to the upper and lower limit alarm measurement. This measurement function only measures infrared temperature.
2. Press and hold the trigger switch to start measurement, release the trigger to stop measurement.
3. When the infrared temperature is higher than the upper limit alarm value, the indicator lights up red alarm and beeping alarm. When the infrared temperature is lower than the lower limit alarm value, the indicator lights up red alarm and beeping alarm. Otherwise, it lights up green.
4. Press the MODE key (< 1 second) to enter the next measurement function.

Figure 7: High/Low Temperature Alarm Notifications.

3rd Measurement Function (Difference Alarm: Infrared Temperature and Ambient Temperature):

1. After startup, press the MODE key (< 1 second) to switch to difference alarm measurement between infrared temperature and ambient temperature. This measurement function includes ambient temperature and infrared temperature measurement.
2. Press the trigger switch to start the measurement, and release the trigger to stop the measurement.
3. When the infrared temperature is higher than the ambient temperature and the temperature difference exceeds the alarm value, the alarm indicator lights red and buzzes alarm. When the infrared temperature is lower than the ambient temperature and the temperature difference exceeds the alarm value, the alarm indicator lights up red and buzzes alarm. Otherwise, the alarm indicator is green.
4. Press the MODE key (< 1 second) to enter the next measurement function.

4th Measurement Function (Difference Alarm: Infrared Temperature and Dew Point Temperature):

1. After startup, press the MODE key (< 1 second) to switch to difference alarm measurement between infrared temperature and dew point temperature. This measurement function includes dew point temperature and infrared temperature measurement.
2. Press the trigger switch to start the measurement, and release the trigger to stop the measurement.
3. When the surface temperature of the measured object is higher than the dew point temperature and the temperature difference exceeds the alarm value, the alarm indicator lights up red, buzzes alarm, and "HI" sign appears. When the surface temperature of the measured object is lower than the dew point temperature and the temperature difference exceeds the alarm value, the alarm indicator lights red and buzzes to alarm, with "Lo" logo appearing. Otherwise, the alarm indicator is green.
4. Press the MODE key (< 1 second) to enter the next measurement function.

5th Measurement Function (Difference Alarm: Infrared Temperature and Thermocouple Temperature):

1. After startup, press the MODE key (< 1 second) to switch to difference alarm measurement between infrared temperature and thermocouple temperature. This measurement function includes thermocouple temperature and infrared temperature measurement.
2. Press the trigger switch to start the measurement, release the trigger to stop the measurement.
3. When the surface temperature of the measured object is higher than the thermocouple temperature and the temperature difference exceeds the alarm value, the alarm indicator light is red, buzzer alarm. When the surface temperature of the measured object is lower than the dew point temperature and the temperature difference exceeds the alarm value, the alarm indicator lights up red and buzzes alarm. Otherwise, the alarm indicator is green.
4. Press the MODE key (< 1 second) to enter the next measurement function.

Operation Notice:

Aiming the thermometer at the object under test and pulling the trigger, the laser indicator can be used to help the thermometer aiming and continuous temperature measurement. When the trigger is released, the measurement results are maintained.

Figure 8: Contactless Safe Temperature Measurement and Laser Targeting.

Note:

• Attention should be paid to distance and spot diameter ratio and field of view (see target distance ratio).
• Laser is used only for aim and is independent of temperature measurement.
• When the ambient temperature changes abruptly, the thermometer should be placed in the environment for 30 minutes in order to make the thermometer reach a stable state.
• After 30 seconds without any operation, the thermometer will be turned off automatically. If you need to start a thermometer, pull the trigger.

Target Distance Ratio (D:S ratio)

The thermometer has a certain angle of view and field of view. Make sure the object under test is full of the field of view of the thermometer, that is, let the thermometer "see" only the object under test and "not see" other objects. The larger the object is, the farther the distance can be measured; the smaller the object, the closer the distance must be. The ratio of the measured distance to the measured target size is D:S ratio of 12: 1.

Figure 9: Distance-to-Spot Ratio (D:S Ratio) diagram.

Infrared Radiation Rate of Object (Emissivity)

The radiant rate represents the ability of an object to radiate infrared radiation. The greater the radiation rate, the stronger the radiation ability of the object surface. The emissivity of most organic or metal oxide surfaces is between 0.85~0.98. The emissivity of the thermometer is 0.95. The emissivity of the instrument should be consistent with the emissivity of the measured object when measuring. Attention should be paid to the effect of radiation on measurement results.

Reference Table of Infrared Radiation

Technical Specifications

Maintenance

Replace the Battery:

WARNING: Batteries contain dangerous chemicals that may cause burns or explosions. If you are exposed to chemicals, wash or seek medical advice with water. To prevent injury and ensure safety work and maintenance:

• Do not disassemble the battery.
• If battery leakage occurs, please repair it and use it first.
• If the meter is not used for a long time, please remove the battery to prevent the battery from leaking and damage the instrument.
• Please make sure that the battery is correct in order to prevent the battery leakage.
• Do not connect the battery terminals together. Do not disconnect or squeeze the battery.
• Do not store batteries in containers that may cause short circuit terminals.
• Do not place the battery near the heat source or the fire source. Do not shine under the sun.

When the battery power is insufficient, the meter displays the "Low battery" symbol and the battery must be replaced at this time. Open the battery cover with your hands, replace the new 1x9V 6F22 battery with the same specifications, and then close the battery cover tightly.

Figure 10: Low Battery Alert and Battery Compartment.

Clean Lens Tube:

Use clean air to remove dust particles from the lens barrel. Carefully wipe the surface with a cotton swab dipped in water.

Surface Clean:

Wet a sponge or soft cloth with soap and water. Do not use abrasives or solvents.

CAUTION: To avoid damaging the thermometer, do not immerse it in water. Do not use corrosive cleaners, otherwise they will damage the shell.

User Tips

• Always ensure the correct emissivity setting for the material being measured to achieve the most accurate readings. The default emissivity is 0.95, suitable for most organic and painted surfaces.
• Keep the infrared sensor and lens clean. Dust or smudges can significantly affect measurement accuracy.
• Remember that this device is designed for industrial non-contact temperature measurement and is not intended for measuring human body temperature.
• For stable readings, especially after significant temperature changes, allow the thermometer to acclimate to the ambient environment for about 30 minutes.

Package Contents

Figure 11: HT651D Package Includes.

The HT651D package typically includes:

• HABOTEST HT651D Infrared Thermometer
• Packaging Box
• English Manual
• K-Type Thermocouple
• Protective Case

Additional Resources

For a detailed visual demonstration of the product's features and operation, please watch the official product video:

A comprehensive user manual in PDF format is also available for download: View User Manual (PDF)