HT3301 / HT3310 Infrared Thermometer

1. Precautions and Safety Measures

The instrument has been designed in compliance with EMC directives for electronic measuring instruments. For your safety and to prevent damage to the instrument, please follow the procedures described in this manual and pay particular attention to all notes preceded by the symbol ?. The following symbol is used in this manual:

ATTENTION

When this symbol ? is displayed, the instrument can emit a laser pointer. Do not point the radiation towards the eyes to prevent physical harm to people. Class II Laser Apparatus according to EN 60825-1.

1.1. Preliminary Instructions

ATTENTION

• Use the instrument only as described in the user manual. Improper use could damage the instrument.
• Do not expose the instrument to direct sunlight, strong light sources, contact with hot objects or surfaces (70°C/158°F), high temperatures, high humidity, or particularly critical environmental conditions.
• After a long period of storage in extreme environmental conditions, recondition the instrument to standard environmental conditions before use.
• When moving the thermometer from a cold to a warm environment, condensation may form on the lens from which infrared rays are emitted. Wait for the condensation to dissipate before taking measurements.
• Do not touch the focal lens from which infrared rays are emitted.
• Always take measurements on objects larger than the spot size. The smaller the object you intend to measure, the shorter the distance to the object should be. If measurement accuracy is particularly important, ensure the spot area is less than half the object's dimension.
• Only accessories supplied with the instrument guarantee safety standards. They must be in good condition and replaced, if necessary, with identical models.
• Do not take measurements under conditions that do not comply with the limits specified in Chapter 9.
• Check that the battery is inserted correctly.
• Do not take measurements if abnormal conditions are observed for the instrument, such as breakage, acid leakage, display off, etc.
• It is not recommended to use the instrument for measurements on shiny or polished surfaces (steel, aluminum, etc.).
• The instrument cannot measure temperature through transparent materials like glass. The measurement result will be the temperature of the glass itself.
• Vapor, dust, and smoke can prevent accurate measurements.

1.2. During Use

Please read the following recommendations and instructions carefully:

ATTENTION

• Never press the trigger when the symbol ? is displayed and the instrument is pointed towards the eyes. The instrument emits a laser pointer.
• If the object whose temperature you intend to measure has a reflective surface, pay maximum attention to ensure the radiation is not reflected towards the eyes.
• Never use the laser pointer in the presence of flammable gases.
• If the symbol ? appears during use, suspend operations and replace the batteries according to the procedure described in paragraph 8.2.
• Exercise extreme caution when the laser pointer is active.
• Never point the instrument, and especially the laser pointer, towards people or animals.
• When using the laser pointer, be aware of any reflective surfaces that could reflect the laser radiation towards the eyes.
• Never use the laser pointer in the presence of flammable gases.

1.3. After Use

• When measurements are complete, turn off the instrument.
• If the instrument is not to be used for a long period, remove the battery.

2. General Description

This manual describes two products: the HT3301 and the HT3310. Table 1 below illustrates the technical characteristics of the two models. The characteristics are the same unless expressly indicated.

Table 1: List of available functions

3. Preparation for Use

3.1. Initial Checks

The instrument was checked electrically and mechanically before shipment. In any case, it is recommended to perform a summary check to ascertain any damage sustained during transport. If any anomalies are found, contact your dealer or HT ITALIA technical service immediately. It is recommended to check that the packaging contains all parts indicated in paragraph 9.3. If it is necessary to return the instrument, please follow the instructions in paragraph 10.1.

3.2. Instrument Power Supply

The instrument is powered by a 9V IEC6F22 NEDA1604 battery included in the package. For battery life, see paragraph 9.1. When the batteries are low, the symbol ? appears. To replace the batteries, follow the instructions in paragraph 8.2.

3.3. Calibration

The instrument meets the technical specifications reported in this manual. Its performance is guaranteed for one year from the date of purchase.

3.4. Storage

To ensure precise measurements, after a long period of storage in extreme environmental conditions, allow the instrument to return to normal conditions (see environmental specifications listed in paragraph 9.2.1).

4. Instrument Description

4.1. Instrument

Figure 1: Instrument Description

LEGEND:

• 1. Infrared Sensor
• 2. Laser Pointer
• 3. LCD Display
• 4. DOWN arrow button
• 5. UP arrow button
• 6. MODE button
• 7. Laser/Backlight activation button
• 8. Measurement trigger
• 9. Ergonomic grip
• 10. Battery compartment
• 11. K-type probe inputs (HT3301 only)

4.2. Display

Figure 2: LCD Display

LEGEND:

• 1. HOLD data
• 2. SCAN measurement activation symbol
• 3. Emissivity symbol and value
• 4. Units of measurement symbol (°C/°F)
• 5. Automatic emissivity calculation symbol (HT3301 only)
• 6. Lock and Laser activated symbols
• 7. High and Low alarm threshold symbols
• 8. Temperature values for MAX, MIN, DIF, AVG, HAL, LAL, TK, LOG functions
• 9. Symbols for EMS, MAX, MIN, DIF, AVG, HAL, LAL, TK (HT3301), LOG (HT3301)
• 10. Measured temperature value
• 11. Low battery indicator

4.3. Auto Power Off

The instrument automatically turns off approximately 7 seconds after the last button press.

4.4. Function Key Description

Figure 3: Function Key Description

LEGEND:

• 1. UP arrow button
• 2. MODE button
• 3. DOWN arrow button
• 4. Laser/Backlight button (press trigger to activate backlight/laser)

4.4.1. MODE Button

The MODE button allows cycling through measurement parameters. The display cycle is as follows:

• EMS (Emissivity)
• MAX (Maximum value recorded during the last measurement)
• MIN (Minimum value recorded during the last measurement)
• DIF (Difference between MAX and MIN values)
• AVG (Average value recorded during the last measurement)
• HAL (High Alarm threshold)
• LAL (Low Alarm threshold)
• TK (Temperature measurement via K-type probe – HT3301 only)
• LOG (Management of 20 memory locations – HT3301 only)

4.4.2. °C / °F, LOCK ON/OFF, and SET ALARM Selectors

Figure 4: Description of internal selectors

LEGEND:

• 1. °C/°F Selector
• 2. LOCK ON/OFF Selector
• 3. SET ALARM Selector

To access the selectors, proceed as follows:

1. Open the front cover of the battery compartment and remove the battery.
2. Select the °C or °F measurement unit using the °C/°F selector.
3. Use the LOCK selector for continuous measurements. Pressing the trigger will perform the measurement until the selector is returned to the OFF position. During continuous measurement, you can activate/deactivate the backlight and laser pointer using the dedicated button.
4. To activate/deactivate alarm thresholds, use the SET ALARM selector. To set alarm thresholds, select the desired threshold (HAL - upper or LAL - lower) using the MODE button, then use the UP and DOWN buttons to modify the value.

5. Parameter Setting

5.1. Emissivity Setting

5.1.1. Definition

The radiant power or emissivity "ε" is a value between 0 and 1 that indicates an object's ability to emit energy in the infrared frequency range. This parameter depends on both the material composing the object and its finish (e.g., object's paintwork). The parameter "ε" is set by default to 0.95 because it has been found in practice that about 90% of objects have a radiant power equal to this value. Determining this parameter is critical for shiny or polished surfaces. To estimate emissivity under these conditions, cover the measurement area with black tape or paint, wait for the area to reach stable temperature, and then take the measurement. Compare the reading with the measurement taken using a traditional contact thermometer.

5.1.2. Emissivity Adjustment (HT3301)

1. Using the MODE button, select the EMS parameter (see paragraph 4.4.1).
2. Press and hold the trigger until "SCAN" flashes in the upper left of the display.
3. Under the conditions of step 2, while still holding the trigger, press and hold the Laser/Backlight button until EMS flashes on the display.
4. Connect the K-type probe, place it in contact with the surface to be measured, and take an infrared measurement at the same point.
5. Press the UP or DOWN arrow buttons to adjust the emissivity until stable and similar values are obtained on both displays. The calculated emissivity value will appear in the upper part of the display.
6. Press MODE or the trigger to return to standard measurement.

Notes:

• If the emissivity value is acquired by measuring temperature at different points using the infrared sensor and a K-type probe, the obtained emissivity value will not be reliable and will inevitably lead to incorrect results.
• For a good emissivity estimate, take measurements on objects with temperatures ≥ 100°C.
• After obtaining the emissivity value, perform some verification measurements. If the value measured with the K-type probe differs significantly from that obtained with the infrared probe, the set emissivity value is incorrect. Repeat the emissivity measurement.

5.1.3. Emissivity Adjustment (HT3310)

1. Using the MODE button, select the EMS parameter (see paragraph 4.4.1).
2. Use the UP and DOWN buttons to set the desired value.
3. Press the MODE button or the trigger to perform the measurement.

Notes:

• After obtaining the emissivity value, perform some verification measurements. For a good emissivity estimate, take measurements on objects with temperatures ≥ 100°C.
• If the value measured with the K-type probe differs significantly from that obtained with the infrared probe, the set emissivity value is incorrect. Repeat the emissivity measurement.

Table 2 lists the Emissivity values of some materials:

(*) Irradiance varies with the point

Table 2: Emissivity Values

6. Operating Instructions

6.1. Temperature Measurement

6.1.1. Infrared Measurement

1. Using the MODE button, select the additional parameter value (see par 4.4.1).
2. Hold the instrument and point it towards the object whose temperature you want to measure.
3. Press the trigger to turn on the instrument and start the measurement. If the display does not light up, check the battery status and replace it if necessary. During the measurement, the LCD display will show the SCAN symbol, the Temperature value, and the value of the selected additional parameter.
4. Release the trigger to stop the measurement and lock the display to the last read value.
5. The instrument will automatically turn off approximately 7 seconds after the measurement stops.
6. Figure 5 indicates the ratio between the distance from the instrument to the object and the measurement spot area. As can be observed, the spot size (S) increases with distance (D). The instrument's focal point is 914mm (36"). The displayed spot area dimensions indicate the zones that enclose 90% of the detected energy.

HT3301 - Measurement Area

HT3310 - Measurement Area

Figure 5: Diameter of the surface S as a function of the distance from the object D (in mm)

Figure 6: Measurement spot area

Yes No

Ensure that the object whose temperature you want to measure has a dimension at least equal to the measurement spot area (see Fig. 6). The smaller the object, the shorter the distance to the object should be. If precision is important, ensure the object's dimension is at least twice the spot area. To measure "Hot Spots", point the thermometer towards the object and then move the instrument along the object until the hot spot is found.

6.1.2. Temperature Measurement with K-type Probe (HT3301 only)

1. Press the MODE button until the TK parameter is selected (see paragraph 4.4.1).
2. Disable the laser pointer using the dedicated button.
3. Connect the K-type probe to the dedicated inputs, respecting the polarity indicated on the instrument and the probe itself.
4. Press the trigger to turn on the instrument and start the measurement. If the display does not light up, check the battery status and replace it if necessary. During the measurement, the LCD display will show the SCAN symbol and the temperature value in the lower right corner of the display.
5. Release the trigger to stop the measurement and lock the display to the last read value.
6. The instrument will automatically turn off approximately 7 seconds after the measurement stops.

7. Memory Operations (HT3301 only)

7.1. Storing Results

1. With the trigger pressed, use the MODE button until the LOG symbol appears in the lower left part of the display.
2. The memory location value will be displayed next to LOG.
3. Take the measurement. To store the value, press the Laser/Backlight button (SET).
4. The stored value will be displayed in the lower right corner of the display. The corresponding unit of measurement (°C / °F) will also be stored.

7.2. Recalling Data to Display

1. Press the MODE button until the LOG symbol appears on the display.
2. The memory location and the corresponding stored value are shown on the display. If the memory location is unused, the symbol "- - -" will be displayed.
3. To view the values contained in the different memory locations, use the UP and DOWN buttons.

7.3. Clearing Memory

1. Press the MODE button until the LOG symbol is displayed.
2. Press and hold the trigger, then navigate to the "LOG 0" location using the UP or DOWN buttons.
3. When location 0 is reached, press the Laser/Backlight button. An audible signal will confirm that the stored results have been cleared.

8. Maintenance

8.1. General

1. The instrument you purchased is a precision instrument. During use and storage, follow the recommendations listed in this manual to avoid possible damage or hazards during use.
2. Do not use the instrument in environments characterized by high humidity or high temperatures. Do not expose directly to sunlight.
3. Always turn off the instrument after use. If you plan not to use the instrument for a long period, remove the battery to prevent leakage of liquids that could damage the internal circuits of the instrument.

8.2. Battery Replacement

When the symbol ? appears on the display, replace the battery.

ATTENTION

Only qualified technicians can perform this operation. Before performing this operation, ensure all cables have been disconnected from the input terminals.

1. Open the battery compartment cover (see Fig. 4).
2. Remove the discharged battery, insert the new battery, and close the battery compartment cover.
3. Do not dispose of used batteries in the environment. Use the appropriate containers for disposal.

8.3. Instrument Cleaning

To clean the instrument, use a soft, dry cloth. Never use damp cloths, solvents, water, etc.

8.4. End of Life

ATTENTION: The symbol shown indicates that the equipment, battery, and its accessories must be collected separately and treated correctly.

9. Technical Specifications

Uncertainty is indicated as [% of reading + degrees]. It refers to the following atmospheric conditions: temperature 18 ÷ 28 °C (64 ÷ 82 °F), humidity < 80 % RH.

Infrared Temperature Measurement

Spectral response: 8~14um

Distance/Spot Ratio (D/S): 30:1 (HT3301), 50:1 (HT3310)

Emissivity: Adjustable from 0.10 to 1.00

Sensor: Thermopile

Laser Diode: Output <1mW, L. Wave 630~670nm, Class II laser apparatus

Temperature Measurement with External K-type Probe (HT3301 only)

NOTE: The above accuracies are considered intrinsic. The measurement is actually affected by the tolerance of the probe used.

9.1. General Characteristics

• Safety: Compliant with CE marking and EMC directives.
• Mechanical Characteristics:
  Dimensions: 100(L)×56(W)×230mm(H)
  Weight: Approx. 290g (battery included)
• Power Supply:
  Battery Type: 1x9V alkaline battery type IEC6F22
  Low Battery Indicator: The symbol ? appears on the display when the battery voltage is too low.
  Battery Life: Approx. 50 hours (with laser pointer and backlight off)
• Display:
  Characteristics: Backlit LCD
  Auto power off: Approximately 7s
  Over Range Indication: "OL" or "-OL"
• Memory:
  HT3301 only: 20 test records

9.2. Environment

9.2.1. Environmental Conditions

• Operating Temperature: 0°C ÷ 50°C
• Operating Humidity: 10 ÷ 80%RH
• Storage Temperature: -20°C ÷ 60°C
• Storage Humidity: < 70%RH
• Max Operating Altitude: 2000m

9.3. Included Accessories

The package contains:

• Instrument
• Battery
• Carrying case
• K-type wire probe (HT3301 only)
• User manual

9.4. Optional Accessories

The following K-type thermocouples are available (HT3301 only):

10. Assistance

10.1. Warranty Conditions

This instrument is guaranteed against any defect in material and workmanship, in accordance with the general sales conditions. During the warranty period, defective parts may be replaced, but the manufacturer reserves the right to repair or replace the product.

Should the instrument need to be returned to after-sales service or a dealer, transport costs are the responsibility of the Customer. Shipping must, in any case, be agreed upon in advance. For shipping, use only the original packaging; any damage caused by the use of non-original packaging will be charged to the Customer. The manufacturer disclaims all responsibility for damage caused to persons or objects.

The warranty does not apply in the following cases:

• Repairs required due to incorrect use of the instrument or its use with incompatible equipment.
• Repairs required due to inadequate packaging.
• Repairs required due to interventions performed by unauthorized personnel.
• Modifications made to the instrument without the manufacturer's explicit authorization.
• Use not contemplated in the instrument's specifications or user manual.

The content of this manual may not be reproduced in any form without the manufacturer's authorization.

Our products are patented and trademarks are registered. The manufacturer reserves the right to make changes to specifications and prices if due to technological improvements.

10.2. Service

If the instrument is not functioning correctly, before contacting the Service Department, check the battery status and replace it if necessary. If the instrument continues to malfunction, check if the operating procedure is in accordance with the instructions in this manual.

Should the instrument need to be returned to after-sales service or a dealer, transport costs are the responsibility of the Customer. Shipping must, in any case, be agreed upon in advance. A note explaining the reasons for sending the instrument must always be attached to the shipment. For shipping, use only the original packaging; any damage caused by the use of non-original packaging will be charged to the Customer.