Dahua BF Series User manual

Installation and commissioning guide for
temperature measurement for human body of
Dahua thermal camera (BF Series)
Zhejiang Dahua Technology Co., Ltd

Preface I
Preface
Summary
The temperature of all materials is higher than absolute zero (- 273.15 ℃) and radiates
electromagnetic wave continuously. The thermal imaging camera collects the infrared radiation energy
emitted by the measured objects, and establishes the accurate corresponding relationship between the
target energy and temperature through complex temperature measurement algorithm and blackbody
temperature measurement calibration and other processes, so as to realize the temperature measurement
function of human body. It is characterized by non-contact, multi-objective, fast, and no risk to the
temperature measurer. It can be easily deployed in densely populated public places, and it can
effectively and safely screen the abnormal temperature preliminarily.
Thermal imaging human body temperature measurement, mainly through the measurement of
human forehead and face temperature (according to the different environment of about 31-36 ℃),
preliminary judgment, found that the suspected abnormal temperature, and then use ear temperature gun
or mercury thermometer to further confirm. As the skin surface of forehead and face is exposed to the
air, the temperature changes due to the influence of air flow and sweat. Generally, under the indoor
ambient temperature of 15 ℃in winter, if the forehead temperature exceeds 35 ℃, there is a
possibility of fever. For other environmental temperature conditions, it is recommended to measure
several samples on site, and increase 1 ℃as the alarm threshold on the basis of normal forehead
temperature.
The human body temperature measurement requires high precision, which requires high
installation mode, environment and debugging. Please read this article carefully.
Combined with the support experience of the thermal imaging R & D technical support team,
this manual describes the installation requirements, common operations and precautions during the
actual use of thermal imaging products, so as to facilitate the quick start and reduce unnecessary
problems. For more detailed instructions, please refer to the product manual and quick operation
manual.
The content described in this article needs to be analyzed in combination with the actual field equipment,
which is not the only way. If you have any questions or good suggestions, please contact Xu Fangrong
(Short NO: 693802), Fang Lu (Short NO: 685718), Li Fuxiang (Short NO: 638137), Fang Shengdong
(short: 669126).
This manual is only for internal use of Dahua employees. Please do not directly provide it to
customers or publish it to public platforms such as the Internet.
Reading objects include (but not limited to): Solution Engineer, Pre-sale / in-sale / after-sale
technical support engineer, installation and debugging personnel, product engineer, test engineer,
marketing and sales personnel and other internal personnel of the company

Preface II
Change record
Revision date
Version number
Creater
Reviser
2020.01.27
V1.0
房圣东
2020.01.28
V1.1
许芳荣/房圣东
房圣东
2020.01.31
V1.2
房圣东
李静
2020.02.03
V1.3
方璐
房圣东

公内部文档，禁止外发 1
Content
Preface .......................................................................................................................................................................I
1 Equipment installation......................................................................................................................................... 2
1.1 Installation Preparation.................................................................................................错误!未定义书签。
1.2 Installation distance..................................................................................................................................... 2
1.3 Installation diagram......................................................................................................错误!未定义书签。
1.4 Real scene diagram.......................................................................................................错误!未定义书签。
1.5 Installation precautions.................................................................................................错误!未定义书签。
2 General settings..................................................................................................................................................... 7
2.1 Device upgrade.............................................................................................................错误!未定义书签。
2.2 Image debugging ..........................................................................................................错误!未定义书签。
2.3 Human body temperature detection function debugging..............................................错误!未定义书签。
2.3.1 Select the intelligent scheme of human body temperature measurement ..........错误!未定义书签。
2.3.2 Blackbody parameter setting .............................................................................错误!未定义书签。
2.3.3 Drawing of human body temperature detection area.........................................错误!未定义书签。
2.3.4Alarm temperature setting..................................................................................错误!未定义书签。
3 Announcements................................................................................................................................................... 12
4 FAQ...................................................................................................................................................................... 13

2
1Equipment installation
1.1 Installation Preparation
Installation Preparation：
5 meter long tape for distance measurement on site
DC2V adapter, used with camera
Some cable lines
Product appearance
BF3221：BF5401 Blackbody：
Note: the recorded installation guidance video "Dahua indoor human body temperature
measurement product installation video (bf3221)", which adopts tripod mode, is applicable to
portable indoor installation guidance reference, and other fixed installation needs to be installed
in strict accordance with the specified height, distance and other requirements.
The PPT version of installation guidance video, web operation guidance and guidance
document should be obtained from the regional delivery supervisor. In the future, it will be
synchronized in the group on the mobile app.
1.2 Installation distance
focal length
Distance between
blackbody and
camera
Distance between human
forehead and camera
Width at the best
distance of temperature
measurement
BF3221（3.5mm）
2m
2m
(NO Blackbody2m)
1.5m
BF3221（7mm）
3m
3m
(NO Blackbody2m)
1.3m
BF5401（13mm）
3m
3m
(NO Blackbody2m)
1.5m
The distance from the forehead to the camera and the distance from the blackbody to the camera have the
best temperature measurement accuracy. Taking bf3221 (7mm) as an example, the distance between
blackbody and camera is 3M, the best distance for temperature measurement is 3M (the straight-line

3
distance between the front of forehead and camera), the best test width at 3M is about 1.3m (about one
gate), the forward temperature at 3M will be higher, and the backward temperature will be lower. The ideal
situation is to place footprints at the 3M position to guide the thermometer to measure temperature one by
one at the designated position.
Bf5401 (13mm) installation requirements are consistent with bf3221 (7mm).
1.3 Installation diagram
Bf3221 (3.5mm) installation diagram
Blac
kbod
y
Height 2m
Side view
h
u
m
a
n
Distance between
two objects: 2m
Height of
Blackbody 1.8m
Thermal camera
(focal length
3.5mm)
Blac
kbod
y
Sidewalk width
1.5m
Top view
Thermal camera
(focal length
3.5mm)
BF3221(7mm) installation diagram
Blac
kbod
y
Height 2m
Side view
h
u
m
a
n
Distance between
two objects: 3m
Height of
Blackbody 1.8m
Thermal camera
(focal length
7mm)
Blac
kbod
y
Sidewalk width
1.3m
Top view
Thermal camera
(focal length
7mm)

4
BF5401(13mm) installation diagram
Blac
kbod
y
Height 2m
Side view
h
u
m
a
n
Distance between
two objects: 3m
Height of
Blackbody 1.8m
Thermal camera
(focal length
13mm)
Blac
kbod
y
Sidewalk width
1.5m
Top view
Thermal camera
(focal length
13mm)
1.4 Real scene diagram
BF3221(7mm) as an example
Height 2m
Distance between
two objects: 3m
Height of Blackbody
1.8m

5
Monitoring picture, the following is the effect of one person in front of the 7mm lens at the 3M position
1.5 Installation precautions
The thermal imaging camera and blackbody are installed on the same side to avoid the occlusion
between the camera and blackbody.
Thermal camera
Height:2m
Best test distance 3M
Height of Blackbody
1.8m
Personnel access direction
1. When the artificial diversion channel
is lengthened as far as possible,
multiple "bow shaped" can be used.
When the indoor and outdoor
temperature difference is large, the
longer the person is indoors, the more
stable the forehead temperature is;
2. Measure the temperature away from
the ventilation at the door.

6
The moving direction of the flow of people is toward the camera. During the test, the forehead of
the target person is facing the camera. It is better to stay and face the camera for temperature
measurement. Temporary measures can be adopted on site to plan the walking route of personnel
and guide the person to the camera position; for scenes with large indoor and outdoor temperature
difference, multiple bow type routes can be planned and the area with wind at the door shall be
avoided, and the temperature measurement can be conducted after the person reaches the indoor
forehead temperature to be stable.
The black body radiation surface (Note: the radiation surface shall not be touched or dirty) shall be
facing the camera irradiation direction, the black body shall be on the left or right side of the
thermal imaging picture, and the tripod can be protected by temporary fence.
As follows, black body is in the upper right corner of the image:
It is required that the visible light channel has enough illumination and avoid the influence of backlight /
reflection / change of strong light / occlusion, etc.
It is forbidden to have high-temperature heat source or sunlight in the thermal imaging picture, to avoid
the interference of heat source such as heater, hot water point, microwave oven, high-power lamp,
radiator, etc., so as to avoid the damage of detector.
The installation area shall be relatively isolated from the outside environment without wind and stability,
to avoid the outdoor or the scene connected with the outside, which is not suitable for the environment
with air flow or strong electromagnetic interference or vibration.
Installation scenarios to avoid
Insufficient light.
Backlight / scene open
to the outside
The direction of people moving is not toward
the camera.

7
2General settings
2.1 Equipment upgrade
The new factory version of the program already supports human body temperature detection and does not need to
be upgraded. (if the bf3221 site version is 20200128 and above, the 20200131 version can be upgraded, item No.:
2.6.01.05.18388). If there is a new iterative process will be notified in the delivery group, please pay attention to
the group information in time. The default to be restored after upgrading is as follows:
Please note: if temperature compensation has been carried out in the original 20200128 procedure, the temperature
will be higher after upgrading. You need to adjust the temperature compensation back to the default value of
0.

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2.2 Debugging of human body temperature detection function
2.2.1 Selection of human body temperature measurement intelligent
scheme
2.2.2 Blackbody parameter setting
Blackbody calibration.
Note: the blackbody parameter setting steps are ignored for the scheme without blackbody.
a) The actual setting of blackbody is 35 ℃
b) After fixing the camera and blackbody position, make sure that the blackbody is in the upper right or
left corner of the image:

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c) The blackbody temperature is 35 (the default value). When drawing the area, double-click the image to
enlarge to the full screen (double-click again to restore the original picture size after drawing). The
green box in the figure below for the rule box should be drawn in the middle of the blackbody radiation
surface, and the rule box should be as small as possible (the smaller the box, the higher the measurement
accuracy, refer to the green box in the upper right corner of the image below). Click OK to take effect.
d) Confirm that the highest and lowest temperature is within 35 ±0.2 ℃on average
2.2.3 Drawing of human body temperature detection area
a) BF3221（7mm）/BF5401 （13mm）：
i. The subject stands on the edge of the blackbody (3m away from the camera), faces the camera, and
can see the head and shoulder exposed in the picture;
ii. The lower border of the rule is drawn on the shoulder of the tested person, and the upper border of
the rule can be drawn to the upper edge of the image; refer to the following figure for the detection
area
b) BF3221（3.5mm）/BF5401 （7.5mm）：
iii. The tested person is standing on the edge of the blackbody (2 meters away from the camera), and
the setting method refers to the 7mm lens;
The setting in the figure below indicates that an audible and visual alarm will be generated when

10
the head temperature of the subject exceeds 37.3 ℃(Note: BF5401 has no audible and visual
alarm)
2.2.4 Alarm temperature correction
Due to the difference of environment, there may be errors in the temperature of the measured person. If more than
5 person samples stand at the best temperature measurement distance and the measured temperature is generally
high or low, they can be compensated by temperature correction. For example, if it is 0.5 ℃lower, fill in 0.5 ℃
for temperature correction, and if it is 0.5 ℃higher, fill in - 0.5 ℃
Note: if there is no blackbody on site, when the temperature is corrected, the "enable" in the figure below is
not checked, otherwise the temperature measurement will be inaccurate;
If you have blackbody, you need to turn on enable.

11

12
3Announcements
The following is for blackbody：
Warning
A warning indicates a condition that may cause harm to the user. To avoid personal injury or instrument
damage, follow these guidelines:
Ensure that the place is free of oil, chemicals, inflammables and explosives!
Use environment is 5 ℃~ 40 ℃, (ideal temperature of temperature measurement environment is
10 ℃~ 30 ℃). Do not put it into high and low temperature box without permission to avoid
accidents!
Make sure to use grounding socket to prevent accidental electric shock!
Blackbody cannot be used for applications other than temperature test and calibration!
It is not allowed to change the boldface range without permission, so as to avoid damaging the
boldface or causing safety accidents!
It is not allowed to dismantle or refit blackbody without permission! Tear up or damage of the
tamper proof label, the product is not warranted.
Notice
To avoid damaging the instrument or affecting the test accuracy, please follow the following
instructions:
It is not allowed to touch the blackbody radiation surface, and dirt will lead to the decrease of
blackbody accuracy or scrap, so as to avoid the scratch of blackbody radiation surface and affect
the temperature measurement accuracy.
Only for indoor use. The use environment shall be free from obvious air convection and strong
light irradiation, strong electromagnetic interference and vibration.
Heat dissipation space shall be reserved around the blackbody, and the distance from the
surrounding objects shall not be less than 10cm.
Calibration
In order to ensure the accuracy of blackbody temperature measurement, it is recommended to send
blackbody to Dahua Co., Ltd. for paid calibration on a regular basis. The calibration cycle is
usually one year.
Daily maintenance
The blackbody shall be managed and maintained by the designated personnel, and the maintenance
and use records shall be made.
In the process of use, it is not allowed to cover any object on the black body, so as not to affect the
heat dissipation and thus the temperature accuracy.
When it is unnecessary to use, dust prevention shall be done well, and the black body shall be put
into the packing box or covered with a clean cloth. Ensure that the storage environment
temperature and humidity are appropriate.
It is recommended to use neutral detergent to clean the blackbody shell and soft brush to clean the
dust on the radiation surface of blackbody.

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4FAQ
1. What is blackbody? What is the role? Do you need a physical connection to the camera?
Blackbody can be simply understood as a constant temperature reference source (constant temperature can
be maintained after power on). When testing human body temperature, blackbody is generally set at 35 ℃,
which is used for temperature correction of thermal imaging acquisition, so as to meet the accuracy
requirements of ±0.3 ℃.
Bold doesn't need to be connected to the camera, it's separate. After power on, it can be placed in the
camera screen according to the installation instructions.
2. Power on stabilization time of equipment.
Blackbody: power on and preheat for 20 minutes; thermal imaging equipment: power on and preheat for 60
minutes, with the best effect.
3. Whether it can be installed in outdoor or semi outdoor environment.
Because the outdoor temperature, wind, humidity and other environmental factors have a great impact on
the temperature measurement of the thermal imaging surface, it is not recommended to be installed
outdoors or in the area directly connected to the outdoor, but in a closed and relatively stable environment
without wind.
4. Why is it recommended to measure the temperature of frontal forehead?
First of all, different people's forehead temperature also has temperature difference. In the case of mask, the
exposed area of forehead is relatively large, which is more convenient for temperature measurement.
The actual temperature of the front face and the side face of the same person / same position is different.
With masks, the high temperature points are mainly in the forehead, ears and neck, and the temperature is
different among different people. Therefore, it is required to face the camera and test the frontal
temperature uniformly to reduce the impact of temperature difference between different parts.
5. What is the best temperature range for temperature measurement?
The best temperature range of indoor wind free and stable environment is 10 ℃~ 30 ℃
6. The best distance for temperature measurement?
The best temperature measurement distance is the same as the distance between blackbody and equipment.
3.5mm detection distance is 2m, and the transverse width of 2m is about 1.5m; 7mm detection distance is
3M, and the transverse width of 3M is about 1.3m; the temperature measurement value far from the optimal
distance will be reduced, and the temperature measurement value close to the optimal distance will be
increased.
7. How many heads can be tested?
As shown in the figure below, in normal use, there are not many people (width 1.3-1.5m) at the best
distance of temperature measurement. There is no limit to the number of heads in the detection area, but it
is too far or there is overlap, which may result in missing or inaccurate temperature measurement. It is
recommended to test one by one.
8. Why does the image of thermal imaging channel get stuck after a period of time? Is it normal?
Normal. In order to ensure image uniformity and temperature measurement accuracy, thermal imaging

14
needs a period of time to set the blank back to zero for correction. During the process of setting the blank,
the image will get stuck once, and the internal part of the equipment will "click" once, which is a normal
situation.
9. Why thermal imaging does not measure temperature after the first configuration
The system time is not synchronized, refer to the time synchronization setting in system debugging.
10. Why is the head frame inaccurate?
It may be related to the installation angle and environmental background on site. If the head detection effect
is not ideal, please provide the Dav video with two channels on site. Send Xu Fangrong and Fang
Shengdong through Dahua interactive platform (select intranet Download for outgoing type). After
receiving the video, the R & D will optimize and iterate according to the scene.
11. Bf5401 (13mm) installation and alarm problems?
The installation requirements of bf5401 (13mm) are consistent with that of bf3221 (7mm). However, the
bf5401 equipment does not have sound and light alarm function, only one thermal imaging channel. The
voice of the web linked computer can be used as shown in the figure below, or the matching smartpss can
be used for prompt, or the alarm output interface (switch signal) of the equipment can be used for external
audio-visual alarm.