testo 835 Infrared and Contact Thermometer Instruction Manual

testo 835 Infrared and Contact Thermometer

Product Information

The Testo 835 is a compact infrared thermometer designed for non-contact measurement of surface temperatures. It can also perform contact measurement when a probe is connected. The H1 version includes an integrated humidity probe for measuring ambient humidity. The product has the following technical specifications:

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

Safety information

Avoid electrical hazards: Do not conduct measurements on or near live parts!

Adhere to the product safety/warranty requirements:

• Always operate the instrument properly and according to its intended purpose and within the parameters specified. Do not use force.
• Do not store with solvents (e.g. acetone).
• Only open the instrument if this is expressly described in the documentation for the purpose of maintenance or repair work.
• Take batteries out of the instrument immediately if they are not functioning properly or if they show signs of overheating.
• Remove all batteries from the instrument if it is to remain unused for a longer period.
• Do not use the device in a polluted environment (heavily dusty, oil, foreign matter, volatile chemicals).

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.

Intended use
The testo 835 is a compact infrared thermometer for non-contact measurement of surface temperatures. When a probe is connected, a contact measurement can also be carried out. The H1 version also has an integrated humidity probe for measuring ambient humidity.

The product should not be used in the following areas:

• Potentially explosive areas
• For diagnostic measurements in the medical sector

Technical data

• Infrared measurement
  • Lens 50:1
  • Spectral range 8 to 14 μm
  • Laser type 4-point laser
  • Output / wavelength < 1 mW / 8 to 14 μm
  • Class / standard 2 / EN 60825-1:2007
  • Measuring range T1 / H1: -30 to +600 °C / -22 to +1112 °F T2: -10 to +1500 °C / 14 to +2732 °F
  • Resolution 0.1°C/°F
  • Accuracy T1 / H1: ±2.5 °C / ±4.5 °F (-30.0 to -20.1 °C / -22.0 to -4.1 °F) (at +23 °C / 73.4 °F, ±1.5 °C / ±2.7 °F(-20.0 to -0.1 °C / -4.0 to 31.8 °F) ±1 digit) ±1.0 °C/ ±1.8 °F (0.0 to +99.9 °C / 32.0 to +211.9 °F) ±1 % of the measuring value (remaining range) T2: ±2.0 °C / ±3.6 °F or ±1 % of the measuring value (the higher value applies)
  • Measuring rate 0.5 s
• Contact measurement
  • Sensor type Thermocouple type K (connectable)
  • Measuring range T1 / H1: -50 to +600 °C / -58 to +1112 °F
  • T2: -50 to +1000 °C/ -58 to +1832 °F
  • Resolution 0.1 °C/°F
  • Accuracy (±1 digit) ± (0.5 °C / 0.9 °F + 0.5 % of the measuring value)
  • Measuring rate 0.5 s
• Humidity measurement (only H1)
  • Measuring range 0 to 100 % RH (at -20 to +50 °C) / -4 to +122 °F)
  • Resolution 0.1 %RH (humidity)
  • 0.1 °C/°F (temperature)
  • 0.1 °C td/°F td (dew point temperature)
  • Accuracy (±1 digit) ± 2 %RH ± 0.5 °C/ 0.9 °F
  • Measuring rate 0.5 s
• General
  • Operating temperature -20 to +50 °C / -4 to 122 °F
  • Transportation/storage
  • temperature -30 to +50 °C / -22.0 to 122 °F
  • Voltage supply 3 x battery type AA or via USB port (only in conjunction with EasyClimate software)
  • Battery life 25 h (typical at 25 °C / 77 °F without laser and display illumination) 10 h (typical at 25 °C / 77 °F without display illumination)
  • Housing ABS/PC
  • Dimensions 193 x 166 x 63 mm / 7.6 x 6.5 x 2.5”
  • Weight T1 / T2: 514 g / 1.13 lbs (incl. batteries)
  • H1: 527 g / 1.16 lbs (incl. batteries)
  • EC Directive 2014/30/EC

Product Description

1. Infrared sensor (IR) lens
2. 4-point laser for measurement spot marking
3. Ambient humidity probe, ambient temperature probe (only H1)
4. Trigger (measurement, switching on)
5. Battery compartment
6. USB interface, probe connector socket for thermocouple probe (TC)
7. Control keys:

8. Display

Initial operation

Inserting batteries

1. Open the battery compartment: open up the cover.
2. Insert batteries (3x type AA). Observe the polarity!
3. Close the battery compartment: close the cover again.

Setting the language
The measuring instrument has a language-specific user interface. English is set as the default user language.

1. Switch the instrument on with [].
2. Open settings mode with [ ].
3. Use [ ] to select (Language) and open with [ ].
4. Select the preferred language with [ ] and apply the setting with [ ].

Operation

Connecting a probe

Connect the temperature probe at the probe socket. Observe the polarity!

On / Off.

• Switch the instrument on: [] or press trigger.
• The display illumination switches off automatically if no key is pressed for 30 seconds.
• Pressing any key switches the illumination back on.
• Switch off the instrument: [].
• The instrument switches off automatically if no key is pressed for 2 minutes

Measuring

Observe information on IR measurement (chapter 12)/contact measurement (chapter 13). The instrument is switched on.

Performing a measurement
The measurement (IR and contact measurement) is started by pressing the trigger. Remove orange protective cap from the lens.

1. Continual measurement disabled: hold down the trigger. – SCAN is displayed. or Continual measurement enabled: press trigger.
   • CONT is displayed.
2. Lock in on measurement object (IR) or position thermocouple (contact measurement).
   • When laser is enabled: the laser points mark the measuring range for IR measurement.
3. Continual measurement disabled: release the trigger to end the measurement. or Continual measurement enabled: press the trigger again to end the measurement.
   • HOLD is displayed.
   • The measuring values are kept until the next measurement.

Settings

Performing settings
The instrument is switched on.

1. Open settings mode with [ ].
   • A box appears around the selected function.
2. Select the required function with [ ] and open with [ ].
3. Perform settings with [ ] and apply with [ ]:

Details: Memory

• The Memory function is opened.
• Save – New Location
• This function can also be opened directly from the measurement view with [].

Save – Save Measurement Data
This function can also be opened directly from the measurement view with []. The current measurement data can be saved in an existing memory location. Only the individual readings currently shown on the display are stored, no series of measurements!

1. Use [ ] to select Save and open the function with [ ].
2. Select an existing location with [ ] and apply this selection with [ ].
3. Save the current measurement data with [ ].

Overview

This function can only be opened via settings mode, not with [] from the measurement view. Existing memory locations can be displayed and deleted. Use [ ] to select View and open the function with [ ].

• The existing locations and the volume of measurement data saved there are displayed.
• To delete a location and the saved measurement data: open the function with [ ], confirm with [ ] () and carry out deletion with [ ].

Delete
This function can only be opened via settings mode, not with [] from the measurement view. The entire memory (measuring locations and measurement data) can be deleted.

1. Use [ ] to select Delete and open the function with [ ].
2. Confirm with [ ] () and carry out deletion with [ ].

Details: Alarm
The alarm function can be switched on/off and alarm thresholds can be set for the measurement channels Infrared (measured), Thermocouple (measured), Dewpoint distance (only H1, calculated) and Surface moisture (only H1, calculated).
The Alarm function is opened.

1. Select Measurement channel and enable by pressing the joystick.
2. Switch the alarm function on/off for the selected measurement channel: joystick up/down.
3. Move the joystick to the right and set limit value(s): joystick up/down.
4. Save entries by pressing the joystick.

Connecting to PC software
The measuring instrument can be connected to a PC via the USB port. With testo easyClimate software (download via www.testo.com/download-center, licence key to activate the software: see back of this instruction manual), instrument configurations can be carried out on the PC and measurement data saved on the instrument can be transferred to the PC. Connect measuring instruments to a PC via USB cable. The instrument switches to slave mode. All instrument control keys are disabled. For further information, please refer to the instruction manual for testo EasyClimate software.

Service and maintenance

Changing the batteries

1. Open the battery compartment: open up the over.
2. Remove used batteries and insert new ones. Observe the polarity!
3. Close the battery compartment: close the cover again.

Cleaning the instrument
Only use weak, commercially available neutral/household cleaning agents (e.g. washing-up liquid) to clean the instrument. Do not use aggressive cleaning agents or solvent!

• Wipe down the housing with a damp cloth (with detergent).
• Clean the IR lens carefully with a cotton bud dipped in water or medical alcohol.

Questions and answers

If we have not been able to answer your question, please contact your local dealer or Testo Customer Service. For contact details, please visit www.testo.com/service-contact.

Information on IR measurement

Measuring method

IR measurement is a visual measurement

Keep lenses clean. Do not carry out measurement with foggy lenses. Keep the measuring range (the range between the instrument and the measurement object) free of obstacles. There must be no particles of dust or dirt, no humidity (rain, steam) and no gases.

IR measurement is a surface measurement

If there is dirt, dust, frost, etc. on the surface, only the outermost layer is measured, i.e. the dirt. For vacuum-packed food, do not measure at air pockets. Where the values are critical, always measure separately with a contact thermometer. Particularly in the food sector: measure core temperature with a penetration/immersion thermometer.

Adjustment time

If the ambient temperature changes (change of location, e.g. measurement indoors/outdoors), the instrument must be allowed to equalise for 15 minutes for infrared measurement.

Emissivity
Materials have various emission levels, i.e. they emit various amounts of electromagnetic radiation. The emissivity of the instrument has a default setting of 0.95. This is ideal for the measurement of non-metals (paper, ceramic, gypsum, wood, paints and varnishes), plastics and foodstuffs. Because of their low or non-uniform emission level, blank metals and metal oxides are only of limited use for IR measurement. Coatings that increase the emission level, e.g. paint or emission adhesive (art. no. 0554 0051) must be applied to the measurement object. If this is not possible: measure using a contact thermometer.

Emissivity table for important materials (typical values)

Material (Temperature) e

• Cotton (20°C / 68°F) 0.77
• Concrete (25°C / 77°F) 0.93
• Ice, smooth (0°C / 32°F) 0.97
• Iron, polished (20°C / 68°F) 0.24
• Iron with cast skin (100°C / 212°F) 0.80
• Iron with rolled skin (20°C / 68°F) 0.77
• Plaster (20°C / 68°F) 0.90
• Glass (90°C / 194°F) 0.94
• Rubber, hard (23°C / 73°F) 0.94
• Rubber, soft grey (23°C / 73°F) 0.89
• Wood (70°C / 158°F) 0.94
• Cork (20°C / 68°F) 0.70
• Heat sink, black anodised (50°C/122°F) 0.98
• Copper, oxidised (130°C / 266°F) 0.76
• Plastics: PE, PP, PVC (20°C / 68°F) 0.94
• Brass, oxidised (200°C / 392°F) 0.61
• Paper (20°C / 68°F) 0.97
• Porcelain (20°C / 68°F) 0.92
• Black paint, matt (80°C / 176°F) 0.97
• Steel, heat-treated surface (200°C/392°F) 0.52
• Steel, oxidised (200°C / 392°F) 0.79
• Clay, fired (70°C / 158°F) 0.91
• Transformer paint (70°C / 158°F) 0.94
• Brick, mortar, plaster (20°C / 68°F) 0.93

Measuring range, distance
Depending on the distance of the measuring instrument from the measurement object, a specific measuring range is recorded.

Measuring lens (ratio of distance: measuring range)

• In italics = laser
• Not in italics = measuring range

Information on contact measurement

• Observe the minimum penetration depth for immersion/penetration probes: 10x probe diameter.
• Avoid using in aggressive acids or alkalis.

Testo SE & Co. KGaA
Celsiusstraße 2
79822 Titisee-Neustadt
Germany
Telefon: +49 76 53 6 81 – 0
E-Mail: info@testo.de
Internet:www.testo.com

References

• rango.de
• Testo international | Professionelle Messgeräte und Messsysteme des Weltmarktführer | Testo SE & Co. KGaA
• Testo Downloads | Testo, Inc
• Testo international | Professionelle Messgeräte und Messsysteme des Weltmarktführer | Testo SE & Co. KGaA
• testo.com/service-contact
• ООО «Тэсто Рус» | Официальный сайт Testo в России

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