REED ST-8839 Instruction Manual Download Page 7

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7

 MODE Button Function

This infrared thermometer measures Maximum (MAX), 
Minimum (MIN), Differential (DIF), and Average (AVG) 
Temperatures. Each time you take a reading, this data is 
stored and can be recalled with the MODE button until a new 
measurement is taken. When the trigger is pulled again, the 
unit will begin measuring in the last mode selected.
Pressing the MODE button also allows you to access the 
High Alarm (HAL), Low Alarm (LAL) & Emissivity (EMS) 
Each time you press MODE, you advance through the 
mode cycle. The diagram on the left shows the sequence 
of functions in the MODE cycle

Switching Settings

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

Select the temperature units (°C or °F) by 
using the°C/°F switch. To lock the unit on for 
continuous measurement, slide the middle 
switch 

LOCK ON/OFF

 to the right. If the 

trigger is pulled while the unit is locked on, the 
laser and backlight will be turned on if they have 
been activated. When the unit is locked on, the 
backlight and laser will remain on unless it is 
turned off using the 

Laser/Backlight

 button on 

the keypad. To activate the alarms, please slide the bottom switch 

SET 

ALARM

 to the right. To set values for the High Alarm (

HAL

), Low Alarm 

(

LAL

) and Emissivity (

EMS

), fi rstly activate the display by pulling the 

trigger or pressing the 

MODE

 button, then press the 

MODE

 button until 

the appropriate code appears in the lower left corner of the display, press 
the 

UP

 and 

DOWN

 buttons to adjust the desired values.

Summary of Contents for ST-8839

Page 1: ...reedinstruments www com Model ST 8839 Non Contact Infrared Thermometer Instruction Manual...

Page 2: ...Function 7 Switching Settings 7 Cleaning 8 Notes 8 9 Battery Replacement 10 Safety Use extreme caution when the laser beam is turned on Do not let the beam enter your eye another person s eye or the...

Page 3: ...cifications Response Time Less than 1 second Spectral Response 8 14um Emissivity Digitally adjustable from 0 10 to 1 0 Over Range Indication LCD will show 0L 0L Polarity Automatic no indication for po...

Page 4: ...ase instruction manual Notes Accuracy Given at 18 to 28 C 64 to 82 F less than 80 RH Field of View Make sure that the target is larger than the unit s spot size The smaller the target the closer you s...

Page 5: ...on 8 Measurement Trigger 9 Handle Grip 10 Battery Cover Display Description 1 Data Hold 2 Measuring indication 3 Emissivity symbol value 4 Low battery lock laser on 5 Backlight on symbol 6 C F symbol...

Page 6: ...begin testing The display will light if the battery is good Replace the battery if the display does not light 3 While measuring the SCAN display icon will appear in the upper left corner of the LCD 4...

Page 7: ...ect the temperature units C or F by using the C F switch To lock the unit on for continuous measurement slide the middle switch LOCK ON OFF to the right If the trigger is pulled while the unit is lock...

Page 8: ...e 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 Spot Size As the distance D from the object increases the sp...

Page 9: ...erature as the material underneath it Measure the temperature of the tape or painted surface Emissivity Values Substance Thermal Emissivity Substance Thermal Emissivity Asphalt 0 90 to 0 98 Cloth blac...

Page 10: ...o reedinstruments com Notes __________________________________________ ________________________________________________ ________________________________________________ _______________________________...

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