Digi-Sense 20250-24 Instruction Manual

User Manual

Infrared Wand with
8:1 Distance-to-Sight Ratio

Model 20250-24

THE STANDARD IN PRECISION MEASUREMENT

Introduction

The Digi-Sense Infrared Temperature Wand (Model 20250-24) is a noncontact
measurement accessory to be used with the Digi-Sense Professional series of
thermocouple thermometers (models 20250-17, -18, -19, -20).

Unpacking

Check individual parts against the list of items below. If anything is missing
or damaged, please contact your instrument supplier immediately.

1. Wand

2. One 9 V battery

3. User manual

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.

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 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.

2

Setup and Operation

1. Plug the connector on the IR wand into the IR input jack on the side of
the meter (see Fig. 1). If the wand is connected properly, “IR - - - -” or
an “IR TEMP” icon will be shown on the meter display.

2. Point the tip of the wand as close as possible to the object being measured
without physically touching the object.

3. Press the SCAN button on the wand to begin measuring and the IR temperature
measurement will be shown on the meter display.

IR input jack

Enter

REC

DIF

Fig. 1

Specifications

Temperature range –31 to 1022°F (–35 to 550°C)

Resolution 1 mV per °F/°C

Basic accuracy ±2% or ±4°F (2°C)

Response time Less than 500 ms

Optical resolution
(Distance-to-Spot ratio) 8:1

Plug diameter Banana plug: 0.16" (4 mm)

Dimensions 6

Power One 9 V battery

1

⁄2" x 2" x 11⁄2" (16.4 x 5 x 4 cm)

SCAN button

3

Field of View

The wand’s field of view is 8:1, meaning that if the sensor is 8 inches from the
target, the diameter of the object under test must be at least 1 inch. Other
distances are shown in the 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. As the distance (D) from the object increases, the spot size (S) of the
area measured by the unit becomes large. The relationship between distance and
spot size is shown in diagram. The focal point for each unit is 8" (203 mm). The
spot sizes indicate 90% encircled energy.

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 reective surface strike your eye.

• Do not allow the laser light beam to impinge on any gas which can explode.

4

Maintenance and Repair

Cleaning and Storage

• The wand should be cleaned with a damp cloth and mild detergent when
necessary. Do not use solvents or abrasives.

• Store the wand in an area with moderate temperature and humidity conditions.

Battery Replacement

When the battery power falls low, the low-battery LED indicator will light.
Unscrew the cover of rear battery compartment to replace the 9 V. Ensure the
cover is securely refastened when finished.

9V

For Product and Ordering Information, Contact:

Toll-Free: 1-800-323-4340
Phone: [phone]
Fax: [phone]
ColeParmer.com/Digi-Sense

1065DGMAN_20250-24 Rev.1

Toll-Free: 1-800-358-5525
Phone: [phone]
Fax: [phone]
Davis.com/Digi-Sense

Manual Part No. 00100-89