831 - Cooking thermometer Testo - Free user manual and instructions

Product type	Non-contact infrared cooking thermometer
Brand / Model	Testo 831
Dimensions (W x D x H)	190 x 75 x 38 mm
Weight	Approx. 200 g (with battery)
Power supply	9 V battery
Battery life	Approx. 15 hours
Housing material	ABS
Main functions	Infrared temperature measurement, min/max display, audible and visual alarm, emissivity adjustment (0.1 to 1.0), backlight, auto-off, °C/°F selection
Infrared measurement range	-30 to +210 °C
Infrared resolution	0.1 °C
Infrared accuracy	±1.5 °C or 1.5% of reading (-20 to +210 °C); ±2.0 °C or 2.0% (-30 to -20.1 °C)
Optics (distance to spot ratio)	30:1 (at 1 m distance)
Response time	0.5 s
Aiming laser	2 lasers, class 2, < 1 mW, wavelength 645-660 nm
Operating temperature	-20 to +50 °C
Storage temperature	-40 to +70 °C
Warranty	2 years
Standards	CE (2004/108/EC), DIN EN 60825-1:2001-11 (laser)
Supplied accessories	Copper protective sleeve (ref. 0516 8302), emissivity adhesive tape ε=0.95 (ref. 0554 0051)
Maintenance and cleaning	Housing: damp cloth. Lens: water or cotton swab with medical alcohol. Do not use abrasive cleaners.
Safety	Do not look directly into the laser beam. Observe safety distances for measurements on live parts. Do not expose the device to intense electromagnetic radiation.
Spare parts and repairability	Battery replaceable by user. Other parts: protective sleeve and emissivity adhesive tape available as accessories.

Frequently Asked Questions - 831 Testo

How to turn the Testo 831 on and off?

To turn on, press the measurement button. The device automatically turns off after 1 minute of inactivity, or you can long-press the same button until the display turns off.

How to perform an infrared measurement?

Turn on the device, hold down the measurement button, aim at the surface with the two lasers (top and bottom spot), then release the button. The measured temperature is displayed along with the Min./Max. values.

How to adjust the emissivity for different materials?

In infrared mode, hold down the measurement button for 3 seconds. Use the ▲/▼ arrows to adjust the emissivity between 0.1 and 1.0. The device automatically returns to measurement mode after 3 seconds of inactivity.

How to set the high and low alarms?

Turn off the device, then hold down the measurement button for 3 seconds. Use ▲/▼ to set the low limit (↓ALARM) then the high limit (↑ALARM). Activate (on) or deactivate (oFF) the alarm with △/▽. The audible and visual alarm triggers when exceeded.

The symbol '---' appears in infrared mode, what to do?

This means the measured temperature is outside the measurement range (-30 to +210 °C). Check that you are within the permissible range and that the lens is clean.

How to clean the thermometer lens?

Gently clean the lens with a cotton swab soaked in water or medical alcohol. Avoid abrasive products. The housing can be cleaned with a damp cloth.

How to replace the battery?

Turn off the device, open the battery compartment by removing the cover, replace the used 9V battery with a new one observing polarity (+/-). Close the compartment.

Can I use this thermometer for frozen or packaged foods?

For frozen foods, preferably use a contact probe. In infrared mode, the measurement may be affected by condensation or packaging. Avoid measuring in the air pockets of packaging.

What is the recommended measurement distance?

The optimal distance is 1 meter, with an optical ratio of 30:1. The farther you are, the larger the measurement spot. At 1 m, the measured spot has a diameter of approximately 33 mm.

Is the laser dangerous?

The Testo 831 uses two class 2 lasers (< 1 mW). Never look directly into the beam and do not point it at eyes. Follow safety instructions.

USER MANUAL 831 Testo

Digital medical or testing device with LCD display and control buttons (no visible text or symbols)

White handheld device with a small battery and plus sign, no visible text or symbols

Please read this document through carefully and familiarise yourself with the operation of the product before putting it to use. Keep this documentation to hand so that you can refer to it when necessary.

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2. Product Description

Accessories

Name Item no.

Leather protection

sleeve 0516 8302

Emissivity adhesive tape

ε=0.95 0554 0051

3. Safety Information

Avoid electrical hazards:

▶ Infrared measurement: Please adhere to the required safe distance when measuring on live parts.

Preserving product safety/warranty claims:

▶ Operate the instrument properly and according to its intended purpose and within the parameters specified. Do not use force.
Do not expose to electromagnetic radiation (e.g. microwaves, induction heating systems), static charge, heat or extreme fluctuations in temperature.
▶ Do not store together with solvents (e.g. acetone).
▶ Open the instrument only when this is expressly described in the documentation for maintenance purposes.

Laser radiation!

▶ Do not look into laser beam. Laser class 2.

Ensure correct disposal:

▶ Dispose of defective rechargeable batteries and spent batteries at the collection points provided.
- Send the instrument directly to us at the end of its life cycle. We will ensure that it is disposed of in an environmentally friendly manner.

4. Intended Use

testo 831 is a compact infrared thermometer for the non-contact measurement of surface temperatures.

Not suitable for diagnostic measurements in the medical sector!

5. Technical Data

Feature testo 831
Parameter °C/°F
Infrared measurement range -30 to +210°C/ -22 to +410°F
Infrared resolution 0.1°C/0.1°F
Infrared accuracy ±1.5°C/ 1.8°F or 1.5% of reading (-20 to +210°C/ -4 to +412°F) (at 23°C/73°F) ±2.0°C/3.6°F or 2.0% of reading (-30 to -20.1°C/ -22 to -4°F) +/- 1 digit	1;1;
Emissivity 0.1 to 1.0 adjustable
Infrared measurement rate 0.5s
Optics (90% value) 30:1 (regarding the distance of 1,0 m to measuring object typically)2
Operating temperature -20 to +50°C/ -4 to +122°F
Transport / Storage temperature	-40 to +70°C/ -40 to +158°F
Power supply	9V block battery
Battery life	15 h
Housing	ABS
Dimensions (LxHxB)	190 x 75 x 38mm/ 7.5 x 3.0 x 1.5in
CE guideline	2004/108/EEC
Warranty	2 years
Laser
Laser type	2 x laser
Power	< 1 mW
Wavelength 645 to 660 nm
Class	2
Standard	DIN NE 60825-1:2001-11

¹ the larger value applies
² + Opening diameter of the sensor (16mm/0.6in)

6. Initial Operation

▶ Insert battery: See 9.1 Changing the battery.

7. Operation

7.1 Switching on/off

▶ Switch on instrument: Press measurement button.
- All display segments light up briefly. The instrument changes to the infrared mode (lights up). The display light remains for 10 seconds every time a button is activated.

▶ Switch off instrument: Keep pressed until display darkens.

The instrument switches off after 1min if no buttons are activated.

7.2 Measuring

! Observe information on infrared measurement (chapter 11).

! The min./max. values are reset by pressing the measurement button.

- The instrument is switched on.

Infrared measurement

1 Start measurement: Hold down measurement button.
2 Locate object to be measured using laser point: Laser marks the upper and lower end of the measurement spot (at distance to measurement object from 1,0m; see chapter 11.2 measurement spot, distance).

- The current reading is shown (2 measurements per second)

3 End measurement: Release button.

- HOLD lights up. The last measured value and min./max. value are saved until the next measurement.

▶ Switch between min., max. and recorded value: Press △

▶ Restart measurement: Press measurement button.

Setting the emissivity

- Instrument is in the infrared measurement mode.

! If no button is pressed for 3 s in the emissivity mode, the instrument switches to the infrared measurement mode.

1 Press for 3 s.

2 Set emissivity: Press or .

- The instrument switches to the infrared measurement mode.

8. Settings

- Instrument is switched off.

! If no button is activated in the setting mode for 3 s, the instrument changes to the next mode.

1 Press for 3 s.

- The device switches to settings mode.

2 Set lower alarm value (↓ALARM): Press ▲ or ▼. Hold the button down to go forward quickly.

3 Set upper alarm value ( ALARM): Press on △. Hold the button down to go forward quickly.

4 Set alarm function on / oFF: Press △ or ▽.

5 Select parameter (°C / °F) : Press △ or ▽.

- The device returns to IR measurement view.

! If the set alarm values are exceeded/not reached, a visual and acoustic alarm is output.

9. Service and Maintenance

9.1 Changing the battery

Exterior view of a white plastic electronic device with a small battery and plug assembly (no text or symbols visible)

Instrument must be switched off!

1 Open battery compartment: Open up cover.

2 Remove used battery and insert new one. Observe +/- . The minus should be visible once the battery is inserted.

3 Close battery compartment: Close cover.

9.2 Clean instrument

Do not use abrasive cleaning agents or solutions.

▶ Clean the housing with a damp cloth (soap water).
▶ Carefully clean the lens with water or cotton buds dipped in water or medical alcohol.

10. Questions and Answers

Query Possible causes Possible solution

Display is no longer illuminated - Low battery. Change battery.
lights up.	- Battery empty.	Change battery.
Instrument cannot be switched on	- Battery empty.	Change battery.
Infrared measurement mode:--- lights up.	- Readings outside measurement range.	-

If we have not answered your question, please contact your local distributor or Testo's Customer Service.

11. Information on infrared measurement

11.1 Measurement method

Infrared measurement is an optical measurement

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▶ Keep lens clean.
▶ Do not measure with clouded lens.
- Keep measurement field (area between instrument and object being measured) free of interferences: no dust and dirt particles, no moisture (rain, steam) or gases.

Infrared measurement is a surface measurement

If there is dirt, dust, frost etc. on the surface, only the top layer will be measured, i.e. the dirt.

In the case of shrinkwrapped foodstuffs, do not measure in air pockets.
If values are critical, always subsequently measure using a contact thermometer. Particularly in the food sector, the core temperature should be measured with a penetration/immersion thermometer.

Adaptation time

If the ambient temperature changes (change of location, e.g. inside/outside measurement) the instrument needs an adaptation time of 15 minutes for infrared measurement.

11.2 Measurement spot, Distance

A specific spot is determined depending on the distance from the measuring instrument to the object being measured.

Measurement optics (Ratio Distance : Measurement spot)

testo 831

Exterior view of a white plastic mechanical device with a small battery and a separate plug (no text or symbols visible)

Close-up of a white mechanical device with a small battery and a plus symbol (no text or symbols visible)

Close-up of a white electronic device with a small black component and a plus sign, no visible text or symbols.

Exterior view of a mechanical device with a small battery and a plus symbol (no text or labels)

Exterior view of a handheld electronic device (no visible text or symbols)