DIGI-SENSE 20250-04 Infrared Thermometer with 10:1 Distance-to-Sight Ratio User Manual
- June 5, 2024
- DIGI-SENSE
Table of Contents
- DIGI-SENSE 20250-04 Infrared Thermometer with 10:1 Distance-to-Sight
- Introduction
- Unpacking
- Key Features
- Meter Description
- Display Layout
- How it Works
- Setup and Operation
- Specifications
- Field of View
- Safety
- Maintenance, Recalibration, and Repair
- References
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
DIGI-SENSE 20250-04 Infrared Thermometer with 10:1 Distance-to-Sight
Ratio
Introduction
The Digi-Sense Infrared Thermometer (Model 20250-04) with 10 to 1 distance-to- sight ratio offers fast response and high accuracy. Advanced features include data Hold, Max/Min readings, and auto power-off. The instrument is fully tested and calibrated to NIST-traceable standards. Careful use of this meter will provide years of reliable service.
Unpacking
Check individual parts against the list of items below. If anything is missing or damaged, please contact your instrument supplier immediately.
- Meter
- One 9 V battery
- User manual
- NIST-traceable calibration report with data
Key Features
- 10:1 Distance-to-sight ratio
- 2.5% basic accuracy
- Fixed emissivity (0.95)
- Precise non-contact measurements
- Laser sighting
- User-selectable °C or °F units
- Automatic data Hold
- MAX/MIN temperature displays
- Automatic selection range and display resolution
- Trigger lock
- Backlight LCD
- Automatic power-off to conserve battery life
Meter Description
- IR sensor
- Laser pointer beam
- LCD
- °C/°F button
- MAX/MIN button
- Laser / Backlight button
- Measurement trigger
- Battery cover
- Handle grip
Display Layout
- Fixed emissivity (0.95) scan icon
- Temperature readout
- Max and Min reading icons
- SCAN measuring indicator
- Data Hold icon
- Laser point indicator
- Low-battery indicator
- °C or °F temperature units
How it Works
Infrared thermometers measure the surface temperature of an object. The unit’s optics sense emitted, reflected, and transmitted energy, which is collected and focused onto a detector. The unit’s electronics translate the information into a temperature reading which is displayed on the unit. The laser is used for aiming purposes only.
Field of View
Make sure that the target is larger than the unit’s spot size. The smaller the
target, the closer you should be to it. When accuracy is critical, make sure
the target is at least twice as large as the spot size.
Distance and Spot Size
As the distance (D) from the object increases, the spot size (S) of the area
measured by the unit becomes larger.
Locating a Hot Spot
To find a hot spot, aim the thermometer outside the area of interest, then
scan across with an up-and-down motion until you locate hot spot.
Emissivity
Emissivity is a term used to describe the energy-emitting characteristics of
materials. Most (90% of typical applications) organic materials and painted or
oxidized surfaces have an emissivity of 0.95
(fixed in the unit). Inaccurate readings will result from measuring shiny or
polished metal surfaces. To compensate, cover the surface to be measured with
black tape or flat black paint. Allow time for the tape to reach the same
temperature as the material underneath it. Measure the temperature of the tape
or painted surface. (Refer to table on page 8.)
Good Measuring Practices
Holding the meter by its handle, point the IR sensor toward the object whose
temperature is to be measured. The meter automatically compensates for
temperature deviations from the ambient temperature. Keep in mind that it will
take up to 30 minutes for the IR sensor to stabilize if going from ambient
temperatures to a much higher (or lower) temperature measurement.
Reminders
- The unit is not recommended for measuring shiny or polished metal surfaces (stainless steel, aluminum, etc.). See Emissivity above.
- The unit cannot measure through transparent surfaces such as glass. It will measure the surface temperature of the glass instead.
- Steam, dust, smoke, etc. can prevent accurate measurement by obstructing the unit’s optics.
Emissivity Values
| Substance | Thermal emissivity | Substance | Thermal emissivity |
|---|---|---|---|
| Asphalt | 0.90 to 0.98 | Cloth (black) | 0.98 |
| Concrete | 0.94 | Human skin | 0.98 |
| Cement | 0.96 | Lather | 0.75 to 0.80 |
| Sand | 0.90 | Charcoal (powder) | 0.96 |
| Earth | 0.92 to 0.96 | Lacquer | 0.80 to 0.95 |
| Water | 0.92 to 0.96 | Lacquer (matte) | 0.97 |
| Ice | 0.96 to 0.98 | Rubber (black) | 0.94 |
| Snow | 0.83 | Plastic | 0.85 to 0.95 |
| Glass | 0.90 to 0.95 | Timber | 0.90 |
| Ceramic | 0.90 to 0.94 | Paper | 0.70 to 0.94 |
| Marble | 0.94 | Chromium oxides | 0.81 |
| Plaster | 0.80 to 0.90 | Copper oxides | 0.78 |
| Mortar | 0.89 to 0.91 | Iron oxides | 0.78 to 0.82 |
| Brick | 0.93 to 0.96 | Textiles | 0.90 |
Setup and Operation
- Hold the meter by its handle grip and point it toward the surface to be measured.
- Pull and hold the trigger to turn the meter on and begin testing. The display will light if the battery is good. Replace the battery if the display does not light.
- While measuring, the SCAN icon will appear in the upper left-hand corner of the LCD.
- Press the °C/°F button to select your desired temperature units.
- Press the Laser / Backlight button to turn on the laser pointer. When the laser is on, the Laser icon will appear on the LCD. Quickly press the Laser /Backlight button again to turn laser off.
- Press and hold the Laser / Backlight button to turn the backlight on or off.
- Release the trigger and the HOLD icon will appear on the LCD indicating that the reading is being held.
- Use the MAX/MIN button to display the maximum or minimum value.
- To conserve battery life, the meter automatically powers down in 10 seconds once the trigger is released.
Specifications
- Temperature range –4 to 630°F (–20 to 332°C)
- Resolution 0.1°F/C
- Accuracy ±2.5 of reading or ±4.5°F (2.5°C)
- Response time Less than 1 second
- Emissivity Fixed at 0.95
- Distance-to-sight ratio (field of view)
- D/S = Approximately 10:1 ratio
- (D = distance, S = spot)
- Laser Single Class 2 (II) Laser
- Spectral range 6 to 14 μm
- Out-of-range indication LCD will show “Hi/Lo“
- Operating temperature 32 to 122°F (0 to 50°C)
- Storage temperature –14 to 140°F (–10 to 60°C)
- Power-One 9 V battery
Field of View
The meter’s field of view is 10:1, meaning that if the meter is 10 inches from the target, the diameter of the object under test must be at least 1 inch. Other distances are shown below in the field of view diagram below. Make sure that the target is larger than the unit’s spot size. The smaller the target, the closer you should be to it. When accuracy is critical, make sure the target is at least twice as large as the spot size
Safety
- Use extreme caution when the laser beam is turned on.
- Do not let the laser beam enter your eye, another person’s eye or the eye of an animal.
- Be careful not to let the laser beam on a reflective surface strike your eye.
- Do not allow the laser light beam to impinge on any gas which can explode.
Maintenance, Recalibration, and Repair
Cleaning and Storage
Battery Replacement
If the battery power is insufficient, the Low Battery icon will appear on the
LCD. Open the battery cover and replace the 9 V battery. Securely close the
cover. It is recommended that Digi-Sense products are calibrated annually to
ensure proper function and accurate measurements; however, your quality system
or regulatory body may require more frequent calibrations. To schedule your
recalibration, please contact InnoCal, an ISO 17025 calibration laboratory
accredited by A2LA.
For Product and Ordering Information, Contact:
- 1.800.544.2843
- www.calcert.com
- sales@calcert.com