Sigma 2008B Series User manual

Sigma 2008B SERIAL DIGITAL
CONDUCTIVITY METER
OPERATING INSTRUCTIONS
Xiamen Tianyan Instrument Co. , Ltd.

CONTENTS
一、 APPLICABILITY AND FEATURES.....................................................1
二、 TYPICAL APPLICATIONS..................................................................1
三、 MEAURING SYSTEM INSTRUCTIONS .............................................3
四、 HAREWARE COMPONENTS OF PRODUCT....................................4
五、 OPERATING INSTRUCTIONS ...........................................................5
5.1 Keyboard instructions ...............................................................................................................5
5.2 Display icon definition...............................................................................................................6
5.3 Operating concepts........................................................................................................................6
5.3.1 Turn of/ turn off.......................................................................................................................6
5.3.2 Measurement...............................................................................................................................7
5.3.2.1 Examples and conditions..........................................................................................................7
5.3.2.2 Measuring probe selection ...................................................................................................8
5.3.2.3 Measurement interface introduction.....................................................................................8
5.3.2.4 Measurement unit.................................................................................................................9
5.3.2.5 Methods of compensation temperature ................................................................................9
5.3.2.6 Methods of temperature coefficient....................................................................................10
5.3.2.7 Methods of curvature compensation coefficient.................................................................10
5.3.3 Calibration.................................................................................................................................11
5.3.3.1 Calibration period...............................................................................................................11
5.3.3.2 Quantity of Calibration Block............................................................................................11
5.3.3.3 Calibration mode introduction............................................................................................11
5.3.3.4 Items before calibration......................................................................................................12
5.3.3.5 High value block calibration ..............................................................................................12
5.3.3.6 Low value standard calibration blocks...............................................................................13
5.3.4 Setting .......................................................................................................................................13
5.3.4.1 Setting menu.......................................................................................................................15
5.3.4.2 Measurement Interface.......................................................................................................15
5.3.4.3Temperature compensation mode........................................................................................16
5.3.4.4 Temperature coefficient setting ..........................................................................................17
5.3.4.5 Calibration block................................................................................................................18
5.3.4.6 Selection frequency and probe...........................................................................................19
5.3.4.7 Unit selection .....................................................................................................................20
5.3.4.8 Back-light selection............................................................................................................20
5.3.4.9 Data query..........................................................................................................................21

5.3.4.10 Data uploading .................................................................................................................21
5.3.4.11 Data storage mode............................................................................................................23
5.3.4.12 Time setting......................................................................................................................24
5.3.4.13 Language selection...........................................................................................................24
六、INFLUENCING FACTORS OF MEASUREMENT ..................................25
6.1 Temperature influence ...................................................................................................................25
6.2 Lift-off influence..........................................................................................................................27
6.3 Material thickness influence..........................................................................................................27
6.4 Camber influence............................................................................................................................28
6.5 Edge Effect......................................................................................................................................29
七、 POINTS FOR ATTENTION AND MAINTENANCE ...........................29
八、 USERS NOTES.................................................................................30
APPEDIX1: TABLE OF CONDUCTIVITY VALUE FOR COMMON MATERIAL
AND TEMPERATURE COEFFICIENT ..........................................................31
APPEDIX2: CONTACTS ...............................................................................31

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Thank you very much for selecting the portable style eddy conductivity meter of
serial Sigma 2008B, This serial is the upgrading product of Sigma 2008A,Which have
the leading technology performance, can totally instead of the similar products
overseas. Sigma 2008B adding a new Frequency testing of 500KHz, This can accurate
measure the thinner test pieces. The Application range is more extensive after adding
continuity measurement and camber measurement mode. In the meanwhile adding
lots of temperature compensation mode can make sure measuring the temperature
accurately under difference temperature conditions.
一、 APPLICABILITY AND FEATURES
Sigma 2008B is the product of digital conductivity meter designed with eddy phase. These
products commonly used in industries of metallurgy, machinery, electric power, aviation and
aerospace, nuke, military, etc.
Characteristics：
Beautiful appearance, easy to carry about and grasp, simple and convenient to use.
Big screen, big character; displaying measured result, working frequency, temperature,
temperature coefficient etc. simultaneously.
Two kinds of switchable frequencies for Sigma 2008B, 60KHz for aviation industry
standard, 500KHz for detecting sheet metal.
Special temperature coefficient setting and auto calibrating mode, convenient and reliable
for user to operate.
Up to 500μm lift-off compensation design, for maintaining the measuring accuracy when
painted, coated or dusty on surface.
The variety of temperature compensation mode design, combined with temperature
coefficient, instruments can ensure the measurement accuracy under different testing
temperature.
With interchangeable probes, the user is able to change probes provided by our company
without matching.
Built-in date memory, can record 16000 sets of test date and important test parameters,
you can connect the computer to generate a complete report.
Two units (MS/m or %IACS) convenient choice, but also can directly switch resistivity in
the measurement of interface.
Three kinds of language selection: Simplified Chinese, Japanese and English.
二、 TYPICAL APPLICATIONS
Conductivity and resistivity measurement of
non-ferromagnetic material
Determining extent of thermal treatment
Checking thermal damage, material fatigue and crack
Determining metal purity
Monitoring of metal homogeneity

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Metal classification
Monitoring of strength and hardness
Detecting the density of powder metallurgy parts

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三、 MEAURING SYSTEM INSTRUCTIONS
Model
Items
Sigma 2008 B
Sigma 2008 B1
Working Freq.
60KHz and 500KHz, sine wave
60KHz sine wave
Measurement
range for
conductivity
0.51 %IACS to 112 %IACS, or 0.3 MS/m to 65 MS/m or
resistivity 0.01538 Ω·mm²/m 到3.33333Ω·mm²/m
Resolution
0.1 %～0.001 %IACS
Measuring
precision
±1%(Temp.0℃~50℃),±0.5%（Temp. 20℃）
Lift-off
compensation
0.5mm of φ14 probe; 0.2mm of φ8 probe;
Temp. Measuring
range
0℃～+80℃（Temp. resolution0.1℃，Temp. Measuring precision0.5℃）
Auto.
Compensation
Testing result of conductivity adjusted to the value at temp. 20℃
automatically
Working
environment
Temp. 0℃～+50℃，Related humidity 0～85%（Non-condensing）
Display
Large screen LCD, with back-light designed, can display multiple items
of important parameter simultaneously
Power supply
Provided lithium ion battery of 3.7V、2200mA/h, continuous working
about 12hours
Probes
B type machine with diameter 14 mm working frequency of 60 KHz
and diameter 8mm working frequency of 500 KHz of a probe; B1 type
machine with a diameter of 14 mm working frequency of 60 KHz of a
probe. Probe can be Self replacement.
Temp. Probe
Hand-hold surface temperature sensor
Reading memory
Save 16000 sets of measuring date
PC
Communication
RS 232 interface, Baud rate: 2400bps; Date rate:8
Host weight
0.5KG（Including battery）
Host size
220 mm×95 mm×55 mm
Shell
Plastic shell
Package and
protection
High impact-resistance, portable box made of aluminum alloy, and
instrument, probe, communication cable, operation manual,
conductivity block, charger, instrument bracket, U-disk (or optical
disk).
Accessories
3 pieces of standard conductivity blocks, can provide more blocks for
customer choose.

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四、 HAREWARE COMPONENTS OF PRODUCT
1.Host machine of conductivity meter 2. Detecting probes （φ14mm、60KHz）
3. Special detection probe 4. External temperature sensor
（φ8mm、500KHz）
5. Curved surface test suite 6. Leather case for main engine protection
7. Conductivity standard blocks 8. Host machine stand

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9. U- disk 10. Batteries recharger
11. RS 232 communication cable 12. Hexagon wrench
13.Operation manual 14. Portable protective box
五、 OPERATING INSTRUCTIONS
5.1 Keyboard instructions
5.1.1 “ MEAS ”：Measuring shortcut key
5.1.2 “ STORE ”：Storing date(effective on manual storing)
5.1.3 “ CAL ”：Calibration shortcut
5.1.4 “ SET ”：Functions setting
5.1.5 “ OK ”：Confirmation
5.1.6 “
UNIT
DEL
”：Measuring unit conversion key (effective for measurement mode)/deleting
key(effective for query mode)
5.1.7 “a0 ”：Temperature coefficient selection

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5.1.8 “
η(φ)
TA
”：Current temperature value input (effective measurement interface)/ Curvature
diameter correction coefficient modification (effective opening the camber
compensation)
5.1.9 “
OFF
ON
”：Turn on/off
5.1.10 “ ”：Increasing progressively or moving upwards
5.1.11 “ ”：Decreasing progressively or moving downwards
5.2 Display icon definition
5.2.1 “ ”indicate the current power margin. When the power margin is less than 1/3,
instrument will issue two consecutive tones every 30 seconds, then continue using a period of
time, the instrument will automatically shutdown for protection, and remind should to
charge now.
5.2.2“ TA=??? ”indicate temperature sensor is not connected, when “temperature
compensation mode” select the “temperature sensor” of “Automatic temperature
compensation”, the “normal measurement mode ”and the “calibration measuring mode”
will appear the icon neither connected with the temperature sensor nor sensor broken nor
detecting temperature is less than or equal to zero.
5.2.3 “ ”indicating that the buzzer alarm is turned on, when “measurement mode” select”
continuity measurement” and buzzer “Beep” selected ON also, the icon of “continuity
measurement mode” will display this icon.
5.3 Operating concepts
5.3.1 Turn of/ turn off
5.3.1.1 In the turning off state, press key “
OFF
ON
”for 2 seconds, the screen appears welcome
interface, and reminds to insert the probe, showing as below.
5.3.1.2 Press the measurement key “MEAS” 、setting key “SET” or calibration key ”CAL”
to go into the corresponding interface directly.Or wait the welcome interface timing
finished to go into the measurement interface automatically.

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5.3.1.3 In the turning on state, press key“
OFF
ON
”for about 2 seconds, this instrument is turned
off and saved current setting information.
5.3.2 Measurement
5.3.2.1 Examples and conditions
There are two ways of measurements, normal measurement(flat surface or camber ) and
continuity measurement, users can select it on the measurement mode, the selection ways and
conditions are as follows:
Example1: normal measurement 1”shortcut operation mode” (Factory setting mode)
This is a pseudo temperature compensation mode, it doesn’t need to consider the temperature
value and coefficient, as long as the following two conditions are met.
①Temperature of the material to be measured is almost the same as the standard temperature
block, use the value of the standard block at 20℃to calibrate, then measure the conductivity for
the testing material..
②The material temperature coefficient of the material to be measure is the same as the
temperature of the standard block. If users want to measure the conductivity of the unknown
material of copper and aluminium sheet, it is right to calibrate as the same temperature coefficient
in the standard block (temperature coefficient of copper and aluminium is -0.004).
2.Operation methods
①When the material to be measured is of flat surface material, refer to “measurement mode” of
the menu 5.3.4.2 to select “close camber compensation”, and set “temperature compensation
mode” of the menu 5.3.4.3 into pseudo temperature compensation. Now both the temperature
value TAof measurement interface and standard interface and temperature coefficient value a0are
display invalid “None”, that is to say it doesn’t have to consider the current temperature value and
select the temperature coefficient when measuring and calibrating. As long as calibrate the
higher/lower value before the measurement. Then return to measurement interface to measure the
conductivity of the material. (refer to 5.3.3.4～5.3.3.6 and 5.3.2.8)
②When testing pieces is of“convex”or“concave”material. Go to the “measurement interface” of
menu 5.3.4.2 select “opening curvature compensation”. For “convex” camber, first change the
hand grip φ14mm probe into “ ”style, then calibrate higher and lower value on the calibration
interface, return to the measurement interface, select the value η(φ) of curvature compensation
coefficient (refer to 5.3.2.6), adjust“ ”grip to the suitable position(refer to 5.3.2.2-b), then
measure conductivity of the camber material.
③When measuring the thin plates or small pieces(area between φ8mm～φ14mm), should
change to φ8mm（500KHz）style probe, select φ8mm-500KHz probe in the “frequency and probe”
of menu 5.3.4.6, the measuring method is the same as ①.
Example2: normal measurement2 “Different temperature operating mode”
This mode is used that calibrations and measurements can’t be operated under the
same temperature circumstance(or calibration temperature isn’t the same as that of
testing material), such as tracking the conductivity change of the material under
different temperatures, and fasting measure the conductivity under non-normal
temperature conditions. This operation mode is relatively cumbersome, but it is
suitable for any occasion, the accuracy is much higher. (refer to 6.1.2.2 “automatic

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temperature compensation-temperature sensor” mode and 6.1.2.3 “automatic
compensation-manual entering temperature” mode).
Examples 3: continuity measurement operation mode
This mode is only worked under “pseudo temperature compensation” mode, used to select the
conductivity faster, and have alarm function of over upper and lower limitation. Calibrate the high
value and the lower value before measurement (refer to 5.3.3.4~5.3.3.6), setting the upper and
lower limitation of alarm value on measurement interface mode, back to the measurement
interface can measure and select the material.
5.3.2.2 Measuring probe selection
a. Diameter of material area is larger than 14mm for a planar working piece or concave
surface, select 14m diameter (60KHz) probe. Use the “ ” shape hand grip to fix the
inner of the probe.
b. Measuring the convex surface of the work pieces, select diameter of 14mm (60KHZ)
probe, with " " type hand grip, adjust the vertical degree of probe plane and convex
surface of work pieces, then tighten the hand grip. Remark: Should calibrate the
instrument before adjusting the hand grip.
c. Diameter of material is greater than 8mm, select diameter of 8mm (500KHz) probe,
hand with" " shape grip to push to fasten on the probe of the inner core.
d. Select diameter of 8mm (500KHz) probe when measure sheet materials (refer to 6.3
material thickness influence), lay down " " shape grip and fasten the probe surface
on the same plane, increase the stability of the measurement.
e. It takes 2~5 minutes to warm up after changing the new probe every time. For 500Hz
probe, we suggest to warm up 5 minutes.
5.3.2.3 Measurement interface introduction
After welcome time or in the welcome, calibration and setting interface to press key
"MEAS" directly, the screen appears as one of the following measurement interfaces
(select see 5.3.4.2 measurement interface mode).
or
Explanation:
a．The text indicates the function of the interface at the top of the screen,
For example, measuring the conductivity value of the plane specimen is
<measurement >, Measure camber specimens <measurement >.

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b．The large numbers in the middle of the screen show conductivity value tested under
the temperature of +20℃or true conductivity values of camber specimen by corrected
coefficient η(φ) compensated.
c．η(φ)=□□□□ is the curvature corrected coefficient of the camber, it is only effective
after the camber compensation opened.
d．MS/m or %IACS is unit for conductivity value, or Ω·mm²/m is the unit for the
resistivity (units setting refer to 5.3.2.4).
e．σ(Tc)=□□□□of the bottom screen said conductivity values which measured under
temperature in bracket .σ(Tc)shows temperature value in brackets is compensation
temperature value, its equal to the TAtemperature value get after four homes into the
rounding.
f．TA=□□□℃indicates the current temperature of testing pieces measured by a
temperature sensor or manual input, or display TA=None under pseudo temperature
compensation mode (setting method see 5.3.4.3 temperature compensation mode).
g．f=□□□KHz indicates the working frequency (setting method see5.3.4.6
frequency and probe selection)
h．a0=□□□□□ indicate the temperature coefficient of testing pieces (a=None is invalid
under pseudo temperature compensation mode or continuity measurement interface)
i．<Continuity measurement >interface, the icons on the screen said alarm beeps
open, no icon is closed. σH=□□□，σL=□□□ said conductivity high values and low
values of separation point ( seeing 5.3.4.2 measurement interface mode).
5.3.2.4 Measurement unit
Measuring interface has two units of selecting methods, one is default instrument unit "MS/m
and % IACS" (see 5.3.4.7 unit selection), which used in data storage, calibration, measurement
mode. Another is quick convert method, in the measurement of interface, press "
UNIT
DEL
" key,
press key once will converse the unit once, such as "MS/m、%IACS、Ω·mm²/m", shut down and
then open or from other interface returns to measurement interface, measurement unit recovery to
the original default units.
5.3.2.5 Methods of compensation temperature
a. When the specimen current temperature TA=□□□℃sets as reading temperature of
temperature sensor (automatic temperature compensation for temperature sensor, see
5.3.4.3) , the temperature sensing end is close to the surface of the specimen until
temperature stable, press "
η(φ)
TA
" button to select TA value(TA display block cursor), press
the "OK" button, σ(Tc)values in brackets immediately modified into TA temperature value
and stored until the next change. Conductivity value（at 20℃）displayed in the middle
screen will update according to the temperature. Remark: When TA=???, compensation
temperature value TC can’t be modified.

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b. When the current temperature TA=□□□℃sets as manual input temperature (automatic
temperature compensation set as manual input temperature, see 5.3.4.3), TA value is
obtained from the following operations: press "
η(φ)
TA
" button, select TA, press "OK" key
enter the digital part, then press the " " or " " button to modify the numerical, press
the "OK" button again, σ(Tc) values in brackets is modified to current TA value and saved
until next modification. This method is used for no temperature sensor or automatic
temperature compensation mode when tested temperature has been known already.
Remark: When TA≦0.4℃or TA=???, compensation temperature value Tc will be
modified into zero which is the default value.
c. When temperature compensation mode select pseudo temperature compensation (see
5.3.4.3), if TA=None ,σ (TC) compensated temperature values in brackets is always
20℃, σ (TC) conductivity value is the same as conductivity of middle row, press"
η(φ)
TA
"
key can’t select TA Value.
5.3.2.6 Methods of temperature coefficient
a. When temperature compensation mode select automatic temperature compensation (a0
value meaningless in pseudo temperature compensated mode or continuity measurements
interface), should be selected a0 value based on test piece temperature coefficient. If
unknown test temperature coefficient, can refer to Appendix 1: "common materials
temperature coefficient" or refer to standard data which the relevant authority provided.
b. In measuring interface, according to the temperature coefficient press key“a0”to select
a0value (appear the circle around a0), press the "OK" button, the cursor moves into digital
line, press the superscript key” ” or subscript keys “ ” to select temperature numerical
stored in the instrument (a1 to a12) , selected a needed value then press the "OK" button to
confirm, the instrument default the a0 value until the next election. If you do not press the
"OK" button to confirm, 5 seconds after, the instrument automatically restore the original
a0 value.
c. This instrument has storage space full of 12 groups (a1 to a12) temperature coefficient
for the user to save the a0value (see the 5.3.4.4 temperature coefficient setting) for
measurement call.
5.3.2.7 Methods of curvature compensation coefficient
If open camber compensation function (see 5.3.4.2 measurement interface mode) , if appear η(φ)
=□□□□ curvature correction coefficient, press the "
η(φ)
TA
" key select η(φ) value (appear the
circle around η(φ)), press "OK" key into the digital part line, according to " " or " " button
to modify the numerical (curvature coefficient selected refer to 6.4 curve surface effects), press
the "OK" key confirmation again, the instrument default the η(φ) value until the next election.

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This instrument’s input values of curvature diameter correction coefficients are from 0.700 to
1.100.
5.3.2.7.1 In the normal measurement interface, hand-hold eddy probe from the air (distance
from the specimen of > 5cm) vertically placed on the surface of the tested, when measuring
stable (about 2 seconds), heard "Di" tone, instrument finish the conductivity measurement and
latch measurements value automatically until the next update.
5.3.2.7.2In continuity measurement interface, when the eddy probe near the specimen,
instrument began to continues measuring, and display according to a certain time interval (about
1s) until the probe left specimens, measurement finished and recover showing the value of zero.
No lock date function and save data function.
5.3.3 Calibration
5.3.3.1 Calibration period
a. Replace the probe, shutdown the instrument after a period of time then open again, the
instrument temperature compensation mode will change (such as automatic compensation
into pseudo temperature compensation), the instrument should be re-calibration.
b. When the instrument finish the preheating, for a half hour time before the operation,
suggest calibrate once a time every 15 minutes.
c. Working under the "pseudo temperature compensation mode" , compare to the recent
calibration, if the calibration testing block temperature changes more than ±2 ℃,
proposed to re-calibrate.
5.3.3.2 Quantity of Calibration Block
a. Using two standard test blocks (high conductivity value σHand low conductivity
values σL) as the calibration for measuring the curve. Each standard block is accompanied
with conductivity value and temperature coefficient numerical. Products manufacturers
have provided and set two original standard test blocks, the users can set up and use
standard test block by your own also (how to set go to see 5.3.4.5 calibration bock setting)
b. High value σH、low value σLblock selection, suggest conductivity values is falls
within the range of calibration block value as possible, or closed to that of high, low value
standard block.
5.3.3.3 Calibration mode introduction
In the measurement or setting the main interface press the calibration key "CAL" directly, the
screen appears calibrate main interface, shown as below.

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Description：
a．"Calibration" indicates the interface function shows on the top of the screen, number
next to the standard is the conductivity value which is calibrated of the standard block
at 20℃conditions (the values setting method see 5.3.4.5 calibration block setting).
b．Numerical in the middle line of the screen represented the conductivity value of the
testing block after calibration at 20℃(unit of measurement instrument for the default
unit)
c．aH=□□□□ (low value aL=□□□□) of the screen bottom is temperature coefficient for the
high value calibration block, the remaining meaning and setting of symbol σ(Tc)、TA、
f is the same as measurement interface .( see 5.3.2.3, 5.3.2.5)
5.3.3.4 Items before calibration
Before calibration, make sure temperature of the probe, testing block and external environment
is stable, then select the temperature compensation value TCof calibration block according to
different temperature compensation modes (methods is the same as the measuring interface, see
5.3.3.5 High value block calibration
Enter the calibration interface, the instrument performance high value blocks calibration first
(digital display next to the "calibration" at the top of the screen is setting value σH(20) , shown
below is the standard temperature coefficient value aH ), probe vertical flat on surface of the high
value block which has the same setting value of sigma σH(20)、aH, measuring the conductivity
value.
a．When the measured value is equal to the setting value σH(20), does not need to
calibrate high value, probe is placed back into the air, press the "OK" key, the
instrument into the low value of the standard calibration block.
b．When the measured value is not equal to the setting value, keeping the probe touch
with the standard block, the instrument enters the automatic calibration when press the
"OK" key, and issue a tone after completion.
c．Back to calibration block again, if the error is more than 0.3%, re-calibration
according to step b, until meet the requirements, then put the probe back into air, press

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the "OK" key to enter the calibration block calibration.
5.3.3.6 Low value standard calibration blocks
(at the top of the screen the digital display next to the "calibration" is setting value σL(20) , shown
below is the temperature coefficient value aL)
a．Probe contacts with the low value standard block which has the same setting value of
σL(20) and aL, and press the "OK" button, the instrument get into automatic calibration,
and issue a tone after completion.
b．Back to measuring standard block again, if the error is more than 0.3%, Re-calibration
according to step a until meet the requirements, then put the probe into the air, press
the "OK" key, exit the calibration interface.
The process of all calibration is not completed, if press the measurement key "MEAS" or setting
key "SET" the instrument will exist the calibration, and the calibration data is invalid this time,
then return to the corresponding interface
5.3.4 Setting
The following is of a set menu function table.

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5.3.4.1 Setting menu
a. Press the key "SET" directly in any interface, the screen appears as below,
b. Press the up “ ”or down “ ”key move the cursor to select the item, then press
confirmation key "OK" to enter the settings.
c. In the settings, if press the setting key "SET" or measuring key "MEAS” will return to
their respective main interface
5.3.4.2 Measurement Interface
a. Press upward key” ” or downward key " " to select the project , when choose
normal measurement, press "OK" button to confirm (tick inside the box), enter into the

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following interface, press " " or " " button to select the curvature compensation
opened or closed ,then press "OK" button to confirm (tick inside the box), exit and return
to main interface.
b. When choose continuity measurement, press "OK" button to confirm (tick inside box),
enter into the following interface.
c. Press the upward key “ ”or downward movement key” ” to select, such as
choose the upper limit value, press the confirm button "OK" into the digital part, and using
increasing bond “ ”or descending key " "finish the numerical modification, press " OK
"button to save and enters to change the lower limited value, the way is the same as upper
limit value, after the completion press the " OK " button to save the data and enter the
alarm buzzer sound" Beep "to open or close, press ” ” or ” ”to select, press the "OK"
button to confirm and exit return to main setting interface.
d. When the buzzer alarm sound "Beep" is selected ON, the conductivity value of
specimen exceeds the preset limit value or below the lower limit value in continuity
measurement interface, the instrument will sound "beep. Beep. Beep" until the end of the
measurement. If choose off "Beep" will be silent.
5.3.4.3Temperature compensation mode

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a. Press upward key” ” or downward key " " to select the project, When choice is
"pseudo temp.comp.", press "OK" button to confirm ( tick inside box) then return to main
interface. When the choice is "automatic temperature compensation," press "OK" button to
confirm (tick inside box) and enter into the following interface.
b. Use key “ ” and ” ”to select the temperature sensor or manual input temperature,
and then press "OK" key to confirm and exit to return settings interface
5.3.4.4 Temperature coefficient setting
a. Press upward key” ” or downward key " " to select an an to modify or to add ,
then click "OK" button to confirm the cursor moves into the digital part, then press the
ascending key " " or decreasing key” ”to modify values (if holding down the " " key
or “ ” key can change numerical quickly), after the completion press the " OK "button,