User Manual: CEM Industrial Dual Laser Infrared Thermometer

1. Introduction

This manual provides instructions for the safe and effective operation of the CEM DT-8867H, DT-8868H, and DT-8869H Industrial Dual Laser Infrared Thermometers. These devices are designed for fast, easy, and accurate non-contact surface temperature measurements across a wide range of industrial applications. They feature dual laser pointers for precise targeting and K-type thermocouple input for contact temperature measurements.

Figure 1: CEM Industrial Dual Laser Infrared Thermometer (DT-8867H model shown)

2. Safety Information

WARNING: LASER RADIATION

• Do not stare directly into the laser beam.
• Do not point the laser beam at anyone's eyes or at reflective surfaces that could direct the beam into eyes.
• Avoid direct eye exposure.
• Keep the device out of reach of children.
• Do not use the device if it is damaged.
• Always operate the device according to the instructions provided in this manual.

This device is a Class 2 laser product. Maximum output < 1mW, Wavelength 630-670nm.

3. Product Features

• Dual Laser Pointers: For accurate targeting, converging at the optimal measurement distance.
• Fast Sampling Time: 150ms response time for quick measurements.
• High Distance-to-Spot Ratio: 50:1 (DT-8868H/DT-8869H) or 30:1 (DT-8867H) for measuring smaller areas from greater distances.
• Wide Temperature Range: Up to 2200°C (3992°F) for infrared measurements.
• K-Type Thermocouple Input: For contact temperature measurements up to 1370°C (2498°F).
• Adjustable Emissivity: Digitally adjustable from 0.10 to 1.0 for various surface types.
• Data Functions: Automatic Data Hold, Trigger Lock, Max/Min/DIF/AVG records.
• Alarms: High and low temperature alarms.
• Display: LCD with white backlight for easy reading in various lighting conditions.
• Connectivity: USB interface for data transfer.

4. Setup

4.1 Battery Installation

1. Locate the battery cover on the handle of the device (refer to Figure 2, item 10).
2. Open the battery cover.
3. Insert the required batteries (typically 9V, not included) according to the polarity indicators inside the compartment.
4. Close the battery cover securely.

4.2 K-Type Thermocouple Connection

To use the K-type thermocouple function:

1. Locate the K-type input jack on the side of the device (refer to Figure 2, item 3).
2. Insert the K-type thermocouple probe into the jack. Ensure a secure connection.

4.3 USB Connection

To connect the device to a computer for data transfer:

1. Locate the USB input jack on the side of the device (refer to Figure 2, item 4).
2. Connect a compatible USB cable (not included) from the device to your computer.

5. Operating Instructions

5.1 Device Overview (Panel Information)

Figure 2: Panel Information, Button Panel Description, and Display Description

Panel Description:

1. Infrared sensor
2. LCD display
3. K-Type input jack
4. USB input jack
5. Backlight/laser button
6. Key (Up/Down selection)
7. Down key (selection)
8. Mode button
9. Trigger
10. Battery cover
11. Handle

Button Panel Description:

1. Laser/backlight on/off key
2. Up selection key (select EMS, HAL)
3. Down selection key (select EMS, HAL)
4. MODE function selection key (cycle function selection)

Display Description:

1. Measurement display
2. Data retention (HOLD)
3. Laser opening mark
4. Lock key display
5. High and low temperature alarm display
6. Maximum value, minimum value, average, difference display (MAX, MIN, AVG, DIF)
7. Current temperature display
8. Maximum/minimum/average temperature value, difference temperature display
9. Emissivity Symbol (ε)
10. Type K Symbol (TK)
11. Emissivity values and K-type temperature values
12. Low battery display
13. °C/°F display
14. Data storage display (LOG)
15. USB display (USB)

5.2 Taking an Infrared Temperature Measurement

1. Point the thermometer at the target object.
2. Press and hold the Trigger (Figure 2, item 9). The laser pointers will activate (if enabled) to indicate the measurement area.
3. The measured temperature will be displayed on the LCD. Release the trigger to hold the reading (Data Hold).
4. For optimal accuracy, ensure the dual laser points converge on the target, indicating the ideal measurement distance.

Figure 3: Distance to Spot (D:S) Ratio Diagram (Example D:S = 50:1)

5.3 Mode Selection and Functions

Press the MODE button (Figure 2, item 8) to cycle through various functions:

• MAX/MIN/AVG/DIF: Displays the maximum, minimum, average, or difference (Max-Min) temperature recorded during a continuous scan.
• EMS (Emissivity): Allows adjustment of the emissivity value.
• HAL/LAL (High/Low Alarm): Allows setting of high and low temperature alarm thresholds.
• LOG (Data Storage): Accesses stored data records.

Use the Up/Down keys (Figure 2, item 6 & 7) to adjust values or navigate within modes.

5.4 Emissivity Adjustment

Emissivity (ε) is crucial for accurate infrared temperature measurements. Different materials emit infrared energy differently. To adjust:

1. Press the MODE button until "EMS" appears on the display.
2. Use the Up/Down keys to adjust the emissivity value from 0.10 to 1.00.
3. Refer to the "Transmittance Comparison Table" (Figure 4) for common material emissivity values.

Figure 4: Transmittance Comparison Table (Emissivity Values)

5.5 High/Low Temperature Alarm

To set temperature alarms:

1. Press the MODE button until "HAL" (High Alarm) or "LAL" (Low Alarm) appears.
2. Use the Up/Down keys to set the desired temperature threshold.
3. When the measured temperature exceeds the HAL or falls below the LAL, an alarm will sound/display.

5.6 K-Type Thermocouple Measurement

With a K-type thermocouple connected (see Section 4.2):

1. The device will automatically detect the connected thermocouple or you may need to select the K-type mode via the MODE button.
2. Place the tip of the thermocouple probe in contact with the object to be measured.
3. The temperature reading from the thermocouple will be displayed, often indicated by the "TK" symbol.

Figure 5: K-type Thermocouple in Use

5.7 Data Logging and USB Interface

The device can store up to 99 readings. To use data logging and transfer:

1. To save a reading, press the appropriate button (refer to device specifics, often a short press of the trigger or a dedicated save button after a measurement).
2. To view stored data, press the MODE button until "LOG" appears, then use Up/Down keys to scroll through records.
3. Connect the device to a PC via the USB interface (see Section 4.3) to transfer logged data using compatible software (software not specified, typically provided by manufacturer or generic data logger software).

5.8 Temperature Unit Conversion (°C/°F)

The device allows switching between Celsius and Fahrenheit. This function is typically accessed via a dedicated button or a combination of buttons (e.g., a long press of the MODE button or a specific key combination). Refer to the display for the active unit.

6. Maintenance

6.1 Cleaning

• Lens: The infrared lens is the most delicate part. Clean it with a soft, clean cloth or cotton swab slightly dampened with water or medical alcohol. Do not use abrasive cleaners.
• Casing: Clean the device casing with a damp cloth and mild soap. Do not immerse the device in water.

6.2 Battery Replacement

When the low battery indicator appears on the display, replace the batteries as described in Section 4.1. Dispose of old batteries responsibly according to local regulations.

6.3 Storage

Store the device in a cool, dry place, away from direct sunlight, extreme temperatures, and high humidity. If storing for extended periods, remove the batteries to prevent leakage.

7. Troubleshooting

8. Specifications

Figure 6: Product Parameters and Functional Specifications

Functional Specifications:

• Dual laser: Yes
• Data hold: Yes
• Automatic power off: Yes
• LCD display with white backlight: Yes
• Low battery prompt: Yes
• Maximum/minimum/differential/average: Yes
• High and low temperature alarm: Yes
• Data record: Yes
• K-type thermocouple input: Yes
• USB interface: Yes

9. User Tips

• Emissivity is Key: Always adjust the emissivity setting to match the material you are measuring for the most accurate results. Highly reflective surfaces (like polished metals) often require lower emissivity settings or may be better measured with a K-type thermocouple.
• Distance Matters: Be mindful of the Distance-to-Spot (D:S) ratio. To measure a small target accurately, get closer to it. The dual lasers converging indicate the optimal distance for the specified spot size.
• Stable Readings: For critical measurements, allow the thermometer to stabilize to the ambient temperature of the environment before use, especially when moving between significantly different temperature zones.

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact your original point of purchase or the manufacturer directly. Keep your purchase receipt as proof of purchase.