HT 891 - Thermostat Cocraft - Free user manual and instructions

Product Type	Thermal Imaging Camera
Brand	Cocraft
Model	HT 891
Measuring Range	-20 to 380 °C (-4 to 716 °F)
Accuracy	±2% or ±2 °C
IR Resolution	33 × 33 pixels
Camera Resolution	480 × 640 pixels
Display Resolution	240 × 320 pixels
Field of View	32° × 32°
Frame Rate	9 Hz
Minimum Focus Distance	0.5 m
Image File Format	Bitmap (BMP) 240 × 320 pixels
Power Supply	4 × AA/LR6 batteries or Micro-USB (5 V)
Memory Card	MicroSD (8 GB supports ~50,000 photos)
Display	Colour screen with adjustable brightness and colour palette
Emissivity Settings	Presets: 0.95, 0.80, 0.60, 0.30; Custom: 0.10 to 1.00
Additional Features	LED light, Max/Min temperature display, image blend (0-100%), auto-off timer
Operating Temperature	-5 to 40 °C, >80% RH
Storage Temperature	-20 to 55 °C, 10-80% RH
Care and Maintenance	Wipe with dry cloth; remove batteries for long-term storage
Safety	Do not use near explosive gases; keep away from children; do not disassemble

Frequently Asked Questions - HT 891 Cocraft

What is the temperature measurement range of the Cocraft HT 891?

The measuring range is -20 to 380 °C (or -4 to 716 °F).

How do I adjust the emissivity setting on the camera?

Go to the menu, select the emission factor setting. You can choose from presets (0.95, 0.80, 0.60, 0.30) or set a custom value between 0.10 and 1.00 to match the material being measured.

What type of batteries does the HT 891 use and how long do they last?

It uses 4 × AA/LR6 batteries (not included). Battery life depends on usage; you can also power via Micro-USB.

Can I save and transfer images from the camera?

Yes, insert a MicroSD card (sold separately). Press the trigger to capture, then press [▲] to save or [▼] to delete. Transfer images to a computer via Micro-USB cable – the card appears as an external drive.

What does the blend function do?

Each short press of the [▼] button increases the blend of the infrared heat map with the visual image by 25%, from 0% (full IR) to 100% (full visual). This helps correlate hot/cold spots with visible objects.

How do I set the date, time, and auto-off timer?

Access the menu via the [MODE] button. Use [▲][▼] to navigate. You can set date/time, display brightness, temperature unit (°C/°F), and auto-off (3, 5, 10 min, or OFF).

What should I do if I see 'SD Card Error' or 'FULL'?

'SD Card Error' means the MicroSD card is missing or damaged. 'FULL' means the card has no free space. Insert a compatible card or delete/transfer existing images.

Is the Cocraft HT 891 waterproof or dustproof?

No, it is not. Avoid using it in very humid or dusty environments. The product should be stored in a dry, dust-free place.

Can I measure temperature through glass or reflective surfaces?

Thermal imaging cameras cannot measure through glass. For reflective surfaces, emissivity must be set correctly – smooth, shiny materials have low emissivity and can reflect radiation from other sources, leading to inaccurate readings.

How do I clean and maintain the thermal camera?

Clean the housing and lens with a dry cloth. Remove batteries if storing for an extended period. Keep in a dry, dust-free environment. Do not disassemble the device.

USER MANUAL HT 891 Cocraft

EASILY DETECT THERMAL BRIDGES, BADLY INSULATED AREAS, ETC.

COLOUR SCREEN DISPLAY

SAVE TO A MEMORY CARD

Read the entire instruction manual carefully and make sure that you fully understand it before you use the equipment. Keep the manual for future reference.

Viktig information:

Original instructions

Bruksanvisning i original

Originalbruksanvisning

Please read the entire instruction manual before using the product and then save it for future reference. We reserve the right for any errors in text or images and any necessary changes made to technical data. In the event of technical problems or other queries, please contact our Customer Services (see address details on the back).

Safety

• Do not use the product where explosive gases or liquids are used or stored. Do not use the product in very humid or dusty environments.
• Never let children play with the product.
• Treat the product with care and do not subject it to shocks or impacts.
• Never try to open the housing, repair or modify the product in any way.
• All repairs must be carried out by qualified service technicians using genuine spare parts.

Product description

1. IR camera
2. Camera
3. LED light
4. Trigger for still image photographs
5. Battery cover
6. Controls
7. Display
8. Micro-USB port
9. MicroSD card slot

Batteries

1. Remove the screw from the battery cover and open the battery compartment.
2. Insert 4 × AA/LR6 batteries (sold separately). Follow the markings inside the battery compartment to ensure the correct polarity.
3. Close the cover and refit the screw.

Note: The camera can also be powered using the Micro-USB port. Remove the batteries from the camera and connect a USB charger or power bank (max 5 V) to the Micro-USB port on the camera (8).

Diagram of a mechanical device interior showing internal components and a directional arrow (no text or symbols)

Buttons and functions

• [ A long press of the on/off button will turn the camera on or off, a short press will return to the previous position in the menu.
• [MODE] A single short press will open and enter menu selections. A second short press will confirm your selection/settings.
• [▲] Move up in the menu. In measuring mode, this button switches the LED light on and off.
• [▼] Move down in the menu. Each short press of the button will increase the amount of the infrared heat map images blended with the visual images by 25%.

Taking photographs

Information: In order for the camera to be able to take photos and store them, it needs to be fitted with a MicroSD memory card (with a 8 GB MicroSD card you can take 50,000 photos).

1. Pull the trigger (4) to take a screenshot of the temperature readings on the display.
2. The image and the words "YES" and "NO" will appear on the display.
3. Press [▲] to save the image on the memory card.
4. Press [▼] to delete the image.

Information

• If the SD card is damaged or missing, "SD Card Error" and "Please Check" will appear on the display.
• If the memory card is full, "FULL" will be displayed.

Transferring images to a computer

Connect a Micro-USB cable to the port on the camera (8) and to a computer. The MicroSD card appears on the computer as an external storage device. Follow the instructions displayed on the computer screen.

Menu

Navigate and change settings by following the instructions in the Buttons and functions section.

	Date and time.
	The number of images on the memory card. View saved images and delete selected images.
	Display brightness setting.
	Select the unit of temperature, °C or °F.
	Setting for how long the camera is to be left on before it automatically shuts off: 3, 5, 10 min. If you select “OFF”, the camera stays on until it is switched off manually.
	Shows how much capacity is left on the memory card.
	Display colour palette selection.
	Emission factor setting. Refer to the Instructions for use section.

Switch the max/min temperature display on/off. On:

Instructions for use

Things to consider when measuring temperature with the thermal imaging camera

• The most common application for a thermal imaging camera is to use it to see the hot and cold areas and temperature differences around a window, in a wall cavity or radiator for example. The colours on the display show hot (red) and cold (blue) areas (if the colour palette of the camera has been set to red/blue). The different colours make it easier to see the areas on the camera display having different temperatures and this is usually more important than the actual temperatures.
• The colours on the image only show which part of area is cold and which part is hot. The blue area in one heat map image need not necessarily have the same temperature as a blue area in another heat map image. The blue colour only shows which part of the image is colder compared to the rest of the image.

If you would like to measure the temperature, there are some things you need to consider:

• In simple terms, you could say that the thermal imaging camera registers the infrared (IR) radiation an object emits.
• Temperature measurement depends on the emission factor of the object. The emission factor is a measure of the capacity of a material (object) to emit infrared radiation.
• The emission factor differs between materials and is influenced by surface colour and texture.
• In order to achieve more accurate temperature measurements, it is therefore necessary to set the emission factor of the camera to suit the material and surface texture of the object being measured.
• The camera menu has a function for setting the emission factor. The camera has 4 set values: 0.95, 0.80, 0.60, 0.30 and a menu where you can select your own emission factor from 0.10 to 1.00.

The table below shows the approximate emission factor of some materials.

Material
Aluminium, non-oxidised 0.02
Concrete 0.93
Iron, emery abraded 0.24
Iron with rolling skin 0.77
Wood 0.94
Radiator, black anodised 0.98
Plastic: PE, PP, PVC 0.94
Masonry 0.93
Paper 0.97
Porcelain 0.92
Bricks, mortar, plaster 0.93

As can be seen from the table, 0.95 is a good average emission factor for most materials.

• The emission factor of a material is also influenced by surface colour and texture.
• It can be difficult to achieve a reliable reading on wet surfaces or surfaces covered in snow or frost.
• It is also difficult to get an accurate reading on dirty and contaminated surfaces. Air pockets can create misleading measurement results.
• Dark, matt surfaces will emit more thermal radiation than bright, smooth surfaces.
• Take into consideration any possible sources of radiation, especially when measuring smooth surfaces (e.g. sunshine, radiators).

Care and maintenance

• Clean the product by wiping it with a dry cloth.
• Whenever the camera is not to be used for an extended period, the batteries should be removed and it should be stored in a dry, dust-free environment.

Responsible disposal

This symbol indicates that the product should not be disposed of with general household waste. This applies throughout the entire EU. In order to prevent any harm to the environment or health hazards caused by incorrect waste disposal, the product must be handed in for recycling so that the material can be disposed of in a responsible manner. When recycling your product, take it to your local collection facility or contact the place of purchase. They will ensure that the product is disposed of in an environmentally sound manner.

Symbol of a trash bin with crossed lines indicating no waste or restriction, and a solid rectangle below (no text or labels)

Specifications

Measuring range -20 to 380 °C (-4 to 716 °F)

Batteries 4 × AA/LR6

Memory card MicroSD

Camera resolution 480 × 640 pixels

Display resolution 240 × 320 pixles

Image file format Bitmap (BMP) image 240 × 320 pixels

Operating temperature -5 to 40 °C, >80% RH

Storage temperature -20 to 55 °C, 10\~80% RH

Accuracy ±2 % or ±2 °C

Field of view 32^ × 32^

Frame rate 9 Hz

Minimum focus distance 0.5 m

IR resolution 33 × 33 pixels

Värmekamera

Art.nr 41-1732 Modell IR-891

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Fotografering

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Specifikationer

Mätintervall -20 till 380 °C (-4 till 716 °F)

Batterier 4 × AA/LR6

Minneskort MicroSD

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Spesifikasjoner

Måleintervall -20 til 380 °C (-4 til 716 °F)

Batterier 4 × AA/LR6

Minnekort MicroSD

Kamera-oppløsning 480 × 640 pixler

Display-oppløsning 240 × 320 pixler

Bildefilformat Bitmap-bilde (BMP) 240 × 320 pixler

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Kuvien ottaminen

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Tekniset tiedot

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Technische Daten

Postal 10 - 13 Market Place

Kingston upon Thames

Surrey

KT1 1JZ

Deutschland

Kundenservice Hotline: [phone]

E-Mail: [e-mail]

Homepage

www.clasohlson.de