Huazheng HPC500 User manual

HPC500
Automobile Exhaust Analyzer
Huazheng Electric Manufacturing (Baoding) Co., Ltd

Dear user:
Thank you for choosing HPC500 Automobile Exhaust Analyzer.
We hope that this instrument can make your work easier and more
enjoyable, so that you can get the feeling of office automation in the test
and analysis work.
Before using the instrument, please read this manual, and operate and
maintain the instrument according to the manual to prolong its service life.
"Just a light press, the test will be completed automatically" is the
operating characteristics of this instrument.
If you are satisfied with this instrument, please tell your colleagues;
if you are not satisfied with this instrument, please call [phone] to
tell you to serve you at all times-Baoding Huazheng Electric Manufacturing
Co., Ltd., our company will definitely make you satisfied !

Contents
I. Introduction: adjustment...............................................................................................................1
II.The main function..........................................................................................................................1
III Technical parameters.................................................................................................................. 2
IV. Principle of operation:................................................................................................................ 3
V. Operation Instruction................................................................................................................... 4
VI. Replacement of spare part......................................................................................................29
VII.Diagnoses for breakdown....................................................................................................... 33
VIII.Instrument storage and maintenance:................................................................................. 34
IX.Responsibility and guarantee of the factory..........................................................................34
X.Appendix.......................................................................................................................................34
XI.Packing list..................................................................................................................................35

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I. Introduction: adjustment
HPC500/400automobile exhaust analyzer according to the national standard
GB18285-2018" ignition engine exhaust emission limits and methods of measurement
( double idle speed and simple driving mode" ) and development of a test apparatus. We
determine the technical indicators, also referring to the people's Republic of China
communications industry standard JT/T386-2004" auto emissions tester technical
conditions" and other standards. Apparatus suitable for gasoline, liquefied petroleum gas
( LPG ), CNG and alcohol as fuel engine emission measurement.
This product is the use of German imports of movement, science and technology
developed by. The performance stability, reliability are in line with international standards
ISO3930or OIML R99 0level precision. The apparatus with a single idle, idle, double ASM
condition measurement.
II.The main function
1, the use of liquid crystal display, Chinese ( or English ) menu, can display HC, CO, CO2,
O2, NOx ( NO+NO2),λ, COcor and speed, oil temperature, flow, pressure data.
2, range, automatic zero. Automatic temperature compensation, automatic oil-water
separator.
3, this machine adopts imported German O2infrared detectors, sensors and NOX sensors,
vibration resistance, good stability, high accuracy.
4, can be equipped with automatic built-in printer interface, RS-232A ( or 0-5V simulation
interface ).
5, machine a self-diagnosis, fault when prompted, until the troubleshooting can continue
measurement.
6, instrument with time function, can display when, minutes and seconds, year, month, day,
print.
7, with HC residues inspection, automatic cleaning gas, gas leak detection function,
cleaning the sampling tube gas path.
8, when measuring instantaneous value end show display concentration, average value,
and examination showed maximum, minimum. Print output concentration maximum value,

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minimum value and average value.
9, can enter the number plate of the car, and can store500 cars measurement data, for
ready retrieval printing.
10, with single, double idle idle measurement measurement, general measuring three
kinds of measurement.
11, with a speed, oil temperature measuring function.
III Technical parameters
1, measurement range:
HC:0 to 10000 ×10-6( PPM ) Vol ( petrol, hexane equivalent )
Or C3H80-20000 ×10-6( PPM ) Vol ( liquefied petroleum gas as fuel, propane equivalent )
CO:0 ~ 10× 10-2( Vol CO2:0% )～20 ×10-2( vol % )
O2:～25 × 10-2( Vol NOx:0% )～5000 ×10-6( PPM ) Vol
λ :0.50～3.00 COcor:0 ～10× 10-2( vol % )
R.M.P:0-9999r.m.p OIL TEMP:0-150 ℃
2, error: HC ± 10× 10-6( PPM ) Vol ( absolute error ) or± 5% ( relative error)
CO ± 0.03× 10-2( % ) Vol ( absolute error ) or± 5% ( relative error)
CO2 ± 0.5× 10-2( % ) Vol ( absolute error ) or± 5% ( relative error)
O2± 0.1× 10-2( % ) Vol ( absolute error ) or± 5% ( relative error)
NOx ± 25× 10-6( PPM ) Vol ( absolute error ) or± 4% ( relative error)
The above error in one of the requirements to meet.
3: auto zero calibration, stability, moment drift≤± 3%
4, repeat: repeat error less than ± 2%
5, resolution:
HC:1 ×10-6( PPM ) Vol CO: 0.01× 10-2( % ) of Vol CO2: 0.1× 10-2( vol % )
O2: 0.01× 10-2( % ) of Vol NOx:1 ×10-6( PPM ) Vol λ:0.01
R.P.M10r.p.m OIL TEMP at 0.1 ℃
6:95% in response, response time less than 10 seconds
7, the preheating time:8min ( can be preheated3min emergency detection )
8, the use of environmental conditions: temperature of -5-50 ℃, relative humidity90%

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9, the oxygen sensor and the nitrogen oxygen sensor in air in life expectancy for two years
and 14 months. ( over the duration of accuracy will drop )
10, power: AC100-240V50/60HZ or DC12V ( matching power inverter )
11, power consumption: <40VA
12, dimensions: 420mm ( long )× 310mm ( W)× 170mm ( high )
13, weight: 9kg
IV. Principle of operation:
The test of HC, CO and CO2via HPC500/400 Auto Exhaust Analyser, which adopts
nondispersive infrared ray analytical method (NDIR), is based on the principle that
different gases selectively absorb infrared rays.
The Instrument, by adopting narrowband infrared interference filter, is capable of
analysing the content of required gas from tested gas, and therefore has good selectivity.
First inject a series of staition gas with different concentration into test chamber of the
instrument to get a standard curve of gas concentration and output voltage and save it in
computer. Inject exhaust gas to be tested into test chamber and then test its relevant
voltage value and compare it with the standard curve saved in computer to get correct
concentration value of tested gas.
For test of HC, CO and CO2, the instrument adopts the same light source and the same
detector. Its circuit adopts advanced technologies, e.g. AGC circuit, micro-processing
computing technology and automatic zeroing, etc. It can display instantaneous value and
also can display average concentration value as required by national inspection code.
Data can be either displayed from front panel or PRTed out. As required by users its back
panel has output interface so that it can be connected with computer.
An oxygen sensor is adopted for testing oxygen concentration. Its output electric current
has linearity relationship with oxygen concentration, from which oxygen concentration can
be tested.
In order to know auto combustion and whether the exhaust has leakage, the instrument
can also displays excessive air coefficient λ and carbon monoxide (CO) emendation value
(COcor), which are related to combustion. Gasoline, LPG and methane have different

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expressions of λ and carbon monoxide (CO) emendation value (COcor) whose function is
to show that auto exhaust pipe has leakage if difference between COcor and CO test
value is significant. At the moment, COcor represents actual CO value, namely the value
when exhaust pipe has not leakage.
V. Operation Instruction
1.Function of operation keys
Fig.1 Sketch map of front panel
Key-S: mainly used for moving cursor (rectangle, dark blue) to choose items needed. It
may also be used for exiting from some operation state (for details, refer to the
explanation on the screen).
Key-E: mainly used for confirming chosen items and executing chosen operation.
Key-▲、Key-▼: mainly used for increasing and decreasing of data revision and can also
used in collaboration with Key-S for choosing of items.
2. Preheat of the Instrument
Connect power supply line at back panel and turn on power supply switch and LCD
display screen displays Warm up，waiting……….xxx S. Now the Instrument enters into
the state of 10-minute warm-up. Countdown mode is adopted for warm-up timing. At the
last 30 sec. of countdown, the instrument opens air pump and reversing valve
automatically, entering 30-sec. automatic zeroing (there is relevant prompt on the screen

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and count-down is also adopted for displaying of the 30 sec.). After warm-up and zeroing
finish, the following main menu image is displayed on display screen:
3. General operation
Warm-up can be ended for entering 30-sec. automatic zeroing ahead of time by
pressing Key-▲ and Key-▼ simultaneously in the process of warm-up countdown. At the
end of zeroing countdown, the above main menu is displayed.
When the main menu is just displayed, cursor is on Test . Continuously press Key-S
to move cursor in sequence to L.P. ,ADJ ,SET ,SCH and Test . When L.P. is
chosen via Key-S, ZERO 、CLS 、ROLL to L.P. may be chosen by pressing Key-▲
or Key-▼.
3.1 L.P. (for inspecting whether gas pipeline of the instrument has leakage)
When cursor is moved to L.P. via Key-S (in collaboration with Key-▲ or Key-▼),
press Key-E, and then a prompt appears on the screen: Put around the probe with sealing,
press E to continue (S: exit). After probe is put around, press Key-E for 20-sec L.P.
(count-down) to judge whether gas pipeline has leakage. If any leakage, “leakage” will be
displayed at the top of image; conversely there will not be such reminder. At the end of
20-sec countdown, it will automatically return to main menu image.
If there is prompt “leakage”, please inspect gas pipeline until there is no leakage in
another L.P. (“leakage” reminder disappears), otherwise the instrument cannot start up
（S: select, E: confirm）hh：mm：ss
HC 0000 CO 0.00
CO20.35 O20.00
NOX0 RPM 0
λx.xxx Flow 2105sccm COcor
0.00%
O.T 114.1℃P 101.6kpa t 27.6℃
TEST L. P. ADJ SET SCH

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test.
3.2 ZERO (used for inspecting whether gas pipeline is severely polluted)
Choose ZERO via Key-S, Key-▲ or Key-▼ and then press Key-E so that the
instrument opens air pump and reversing valve for 20-sec “Zeroing” (or reset). A prompt
appears on the screen: Zeroing, wait…19s(S: exit). It will automatically return to main
menu image at the end of 20-sec countdown.
If gas pipeline has been severely polluted, zeroing result of benchmark error will be
displayed at the top of screen (failure of benchmark voltage being too low resulted from
severe pollution). With the failure the instrument will not be able to start up test. Therefore
in this way gas pipeline must be cleaned.
3.3 CLS (namely reverse blowing)
For HPC400 instrument, users can connect the instrument with air compressor for
reverse blowing and sampling tube for reverse blowing cleaning. Its operation is: choose
CLS via Key-S, Key-▲ or Key-▼and then press Key-E for 5-sec cleaning. In addition,
when failure of gas pipeline obstruction appears, choose CLS and press Key-E for
eliminating prompt “gas pipeline obstruction” on the screen.
3.4 ROLL (used for operation of installing PRTer scroll)
Choose ROLL via Key-S, Key-▲ or Key-▼ and then press Key-E for 5-sec ROLL
that will stop automatically at the end of 5 sec. When roll is started up, STOP is displayed
at the cursor, namely if, at the moment, pressing Key-E again roll would be stopped and
ROLL is displayed again at the cursor.
3.5 SET
Choose SET via Key-S and then press Key-E, then the following SET menu will be
displayed on display screen:

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The setup menu is used by users for SET Stroke, IGN. mode, Fuel type, test mode
and time setup (refer to the 5th item below for time setup).
The choice of Stroke and IGN.M. mode will affect the test of speed. Their relation is:
Stroke
4 Stroke
2 Stroke
IGN.M. mode
Once
Double
Once
Double
RPM calculation
×2
×1
×1
÷2
Therefore if Stroke or IGN.M. mode were wrongly chosen, RPM calculation would have
error of integral times.
If choosing “gasoline”, test result of HC adopts hexane normal (‘HC’ is chosen for display);
if choosing LPG, test result of HC adopts propane normal (C3H8is chosen for display).
Test mode can either be set here or reset in test menu.
Continuously press Key-S to choose in sequence Stroke , IGN. mode ,
Fuel type ,Test mode ,Time setup and Return . The former 4 Items
can be reset by pressing Key-▲ or Key-▼, after chosen via Key-S.
When cursor appears at Return ，press Key-E for exiting from SET and returning to
main menu image.
3.6 ADJ and Inspection
Choose ADJ in main menu via Key-S and then press Key-E, then the following adjust
Setup menu hh : mm ：ss
Stroke： √4 stroke 2 stroke
IGN. mode： √once double
Fuel type： √gasoline LPG
Test mode ：Idle
Time setup
resturn
S:select, E:confirm,∧∨ modify

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menu is displayed on display screen:
The menu is used by users for, when necessary, ADJ (also called “scaling”) or inspection
ADJ of each item has been done before the instrument leaves factory. Therefore, in
addition to O2ADJ, ADJ of the other items may be redone (Scaling) after the instrument
has been used for a period of time (3 months or more), based on specific requirements.
Refer to the 6th Item below for details of ADJ operation.
Item 6，1，2，3，4，5 may be chosen in sequence by pressing Key-S.
Choose Item-6 VOLTAGE DISPLAY via Key-S, and then press Key-E, then the following
image is displayed:
When something goes wrong with the instrument, use the voltage value on the image for
judgment.
Adjust hh ：mm ：ss
1：HC/CO/CO2ADJ
2：O2/NO ADJ
3：O T. ADJ
4：Config reset
5：Return
6：Voltage display
7：Gauge gas check
(S: select, E:confirm)
V form sensors：（S : exit）10:59:52
Vcur Vref Scale T.scale
HC 4.602 4.751 1.000 40
CO 4.446 4.426 1.000 60
CO24.446 4.426 1.000 -90
O20..446 3.426
NOx 4.446 4.426 10
P 4.727 9.999 P.ref=100.7kpa
Flow 4.999 9.999 T.cur =27.7℃
O.T 4.999 T.adj=30.3℃
G.T 0.556 HC.scale=0.542

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Press Key-S for exiting from the image and returning to adjust menu.
Choose Item-7 Gauge gas check via Key-S, and then press Key-E, then the following
image is displayed:
Note: whether HC/ C3H8appears on the screen is determined by the choice of fuel type in
SET menu. Choose GASOLINE, and HC appears; choose LPG and C3H8appears.
At the same time, cursor can be moved from TEST to ESC . When cursor points at TEST ,
a prompt appears on the screen by pressing E: press gauge gas to Test point(S: exit E:
confirm to check)
3-5sec later, press E to carry on 45sec. test. When countdown ends, send the
average value of the last 30sec. to check out as the test result. Meanwhile PRT appears
on the screen. Choose PRT via S, and then test result can be PRTed via E.
Move cursor to ESC , press E for returning to adjust menu, and then press E for returning
to main menu.
3.7 Search
The instrument is capable of saving test data and at most can save test data of 2000
vehicles (beyond that, only data of the last 2000 vehicles would be saved and the anterior
data would be lost).
SCH can be performed on the data saved.
Choose SCH in main menu via Key-S and then press Key-E, and then the following menu
Gauge gas check
11:07:35
C.Cur Check out
HC/C3H8
CO
CO2
O2
Nox
S : select, E: confirm
ESC TEST

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is displayed:
The image shows how much data is saved. SCH can be done either by index on
number-plates or index on serial number . (the one saved last shall be the first Item and
from back to front in sequence are 2nd, 3rd, ……Item)
Item 1, 2, 3, 4 may be chosen in sequence by pressing Key-S.
When Item 2 (SCH by index on number-plates) is chosen, press Key-E and then a prompt
“Plate No: XXXXXX（S: select ，E: confirm,∧∨: modify，）” appears on the screen.
Follow the prompt to revise the 8-character number plate to be index number, and then
press Key-E (directly press Key-E if there is no need for revision), then relevant data index
is displayed on the screen, including number of data, test time, number plate,
concentration values, RPM and O. T, etc.
When Item 3 is chosen (SCH by index on serial number), press Key-E and then index on
serial number that can be reset is prompted on the screen. Then press Key-E to show the
data of the Item. Test data of serial number +1（or –1）may be searched by pressing
Key-▲ (or Key-▼).
At the end of index SCH, press Key-S to return to database menu.
If Item 1 (DELETE ALL DATA) is chosen, press Key-E then a prompt ” Delete all data! S:
cancel E: confirm “appears on the screen. .press key–S to return database menu; press
key –E and then a prompt “Data is deleted!” appears on the screen .
If Item 4 ESC is chosen, press Key-E to return to main menu.
3.8 Test
Choose Test in main menu via Key-S and then press Key-E, and then the test image is
Database NO. ×××× hh：mm：ss
1：Delete all data
2：Index on number plates
3：Index on serial number
4：Return

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displayed on the screen:
PRT and SAVE may not appear and cursor is at ESC when the test menu is just
displayed
STR , PRT , SAVE and CUR may be chosen in sequence by pressing Key-S, as well
as 7-character number plate and the sign of SET or not, e.g. √SFLO1234 ,IDLE ,ESC .、
may be chosen in sequence. by pressing key –s.
Method for SET and reset of number plate:
When cursor is at the 8-character number plate and a former sign such as
√AFL01234（number plate set originally）, press Key-E and cursor is at only sign ×, while
“×” or “√” can be chosen by pressing Key-▲ or Key-▼. Sign “×” indicates not SET number
plate, while sign “√” indicates SET number plate. When “×” is chosen, number plate shall
not be set and the 7-character number plate behind it shall be invalid, and there shall be
not number plate in PRTing out, nor is in data saved. At the moment, press Key-E again,
cursor will return to including the whole 8-character ×AFL01234 （indicating not SET
number plate!）.
Press key-s to move crusor to the first charatcter A ,and press key -△or key -▽to reset.
When sign “√” is chosen, SET and revision of number plate shall be performed next.
Press Key-S again to move cursor to the second character F, and press Key-▲ or Key-▼
for reset. After the reset of second character is completed, press Key-S again to move
IDLE hh：mm：ss
HC 0000 CO 0.00
CO20.35 O20.00
NOX0 RPM 0
λ1.000 Flow 2105sccm COcor
0.00%
O.T 114.1℃P 101.6kpa t 27.6℃
TEST STR PRT SAVE CUR

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cursor to the third character and press Key-▲ or Key-▼ for reset. Likewise, perform
revision until the reset of the 8th character is done. Characters from the 2nd to 7th can
choose from the Arabic numerals from 0 to 9 or the 26 capital English letters from A to Z.
After reset of number plate is done, press Key-E for confirmation and cursor shall be at
√BRP12345 （supposed to be new number plate）
When cursor is at IDLE it may be reset to be Double idle and General by pressing
Key-▲ or Key-▼.
Note: Prior to starting up test, reset of number plate must be done (if number plate is not
needed sign ‘×’ before number plate must be chosen). And test mode also must be
chosen from general, idle and double idle. before test can be started up.
Press Key-S to choose ESC ，and Key-E to return to main menu.
4. Test Procedure
4.0 Preparation prior to test
4.0.1 The instrument has entered into main menu display after 10 minutes’ preheat.
4.0.2. Connect probe with inlet of water trap on the back panel of the instrument with a
5-meter-long plastic tube. Equipped with a speed and oil temperature sensor: speed
sensor head is inserted into the cigarette lighter in the car ( or sleeve crocodile clip, clip in
the car battery on the positive and negative pole ); the oil dipstick out, the oil temperature
probe insert.
The instrument has three kinds of test mode, namely General, idle and double idle.
General, in which instantaneous test data is displayed continuously, applies to observing
and monitoring real-time value of exhaust gas emission from motor vehicle and test under
ASM.
Idle is arranged according to regulations on idling procedure from GB/T3845-93
"measurement method for pollutants at idle speed from vehicle with prefot engine.”.
Double idle is arranged according to regulations on D. idling procedure from Appendix C
of GB/T3845-93 "Test method for pollutants at D. idle from vehicle”.
The instrument also applies to users without tachometer or OIL. T probe.
4.1 Test with Idle speed

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First input number plate of vehicle to be tested as stated in Section 3.8 and 3.5, and then
choose Stroke, IGN.M. mode and idle.
4.1.1 Choose STR via Key-S in test menu, and then press Key-E, then the following
prompt is displayed on the screen:
4.1.2 Adjust speed to rated speed via Key-▲ or Key-▼, and then press Key-E, then the
instrument enters into 20-sec automatic zeroing process. The following image is
displayed:
4.1.3 At the end of 20-sec zeroing countdown, the instrument enters into 30-sec HC
remained check . The following image is displayed:
4.14 HC remained check passes test, the following prompt of 70% of rated speed is
displayed:
When RPM is adjusted to （3500±100）r/min, the instrument prompt:
Now the instrument enters into 30-sec countdown of engine preheat.
4.1.5 After engine preheat finishes, it is prompted on the following image to retard the
speed to idle (≤1100r/min).
Set speed ：5000
∧∨ : modify ; E : confirm
S : ignore speed
Zeroing, wait…… 19
S: exit
HC remained check ，Wait
S:exit
Speed up to 3500r/min
S: exit
Keep at 3500r/min
29
Retard to ≤1100r/min
S: exit

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4.1.6 When RPM is adjusted to appropriate value, the following prompt image is
displayed:
4.1.7 After the probe is inserted into the exhaust and exhaust gas enters into optical path
of the instrument, the instrument enters into idle test.
Test lasts altogether 45 seconds, and the former 15 seconds is at preparation stage. For
the last 30 seconds the maximum value and minimum value shall be determined and
saved by the instrument, and average value shall be worked out.
4.1.8 When test time is up, the following prompt image is displayed:
Along with taking out the probe, HC concentration reduces. When HC
concentration reduces below 30% of average value or is less than 22ppmvol,
the instrument opens reversing valve automatically to accelerate the
cleaning of test optical path system. The following prompt image shows that
the instrument enters into 60-sec countdown of zeroing:
After zeroing is completed, the air pump is turned off and the instrument enters into 5-sec
cleaning (reverse blowing);
After cleaning (reverse blowing) of sampling tube is completed, valve is turned off and the
instrument returns to test menu, and average value of the test is displayed on the screen.
4.1.9 Choose PRT via Key-S and then press Key-E to PRT out the result of idle.
4.1.10 Choose SAVE via Key-S and then press Key-E to save the test data and number
Put the probe in the exhaust
keep idle，S :exit
Testing，wait……44
keep idle，S:exit
Take out the probe!
S : exit
Zeroing ……59
S: exit
cleaning ……59
S: exit

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of the data saved will be displayed on the screen. Press key –s for return to test menu.
4.1.11 Choose AVE via Key-S and then press Key-▲ or Key-▼ to inspect the display of
the minimum value, real-time value and maximum value, and then return to display of
average value.
4.2 Double idle(accompanying tachometer)
As said above in section 3.8 and 3.5, inputting number plate of the vehicle to be
tested and selecting double idle.
4.2.1 Choose STR in test menu via S. Press E and the prompt Set Speed will
appear on the display screen (the display screen is the same as that mentioned in section
4.1.1)
4.2.2 The same as 4.1.2
4.2.3 The same as 4.1.3
4.2.4 The same as 4.1.4
4.2.5 After preheat of engine is completed, the screen prompt notices: adjust RPM to
fast idle (50% of rated speed), as following:
4.2.6 The screen will have the following prompt notice after RPM is adjusted to normal
range of fast idle:
4.2.7 After probe injected into the exhaust, the instrument enters fast idle test when
exhaust gas gets into optical path.
Fast idle test is 45 seconds altogether, first 15 seconds are for preparation and the
following 30 seconds are for formal test. The maximum value, minimum value and
average value will be obtained.
4.2.8 After fast idle test is completed, the instrument will prompt notify:
Retard to 2500r/min
S: exit
Put the probe in the exhaust
keep fast idle，S: exit
testing，wait……44
keep fast idle，S : exit

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After RPM is adjusted to idle, the instrument will prompt notify:
2 seconds later, it shows:
Idle test is 45 seconds altogether, first 15 seconds are for preparation and the following 30
seconds are for formal test. The maximum value, minimum value and average value will
be obtained.
4.2.9 After idling is completed, operation and notification on instrument are the same as
that said in 4.1.8
The process includes taking out probe, shutting off air pump after 60-second cleaning,
5-second cleaning (reverse blowing), switching off valve and automatically returning to
test menu. At this time, the data shown is the average value AVE2 of the second time (idle)
test.
4.2.10 Choose PRT via S and press E to PRT out the test result of both fast idle test and
idling.
4.2.11 Save, the same as 4.1.10
4.2.12 Choose A V E 2 via S, and press ▲or ▼ to check and display MIN2 (the minimum
value of the second time idling), real-time value, maximum value (fast idle), average value
(fast idle), minimum value (fast idle), MAX2 and AVE2.
4.3 General
According to section 3.8 and 3.5, number plate of the vehicle to be tested and Stroke,
IGN.M. mode and general shall be input.
4.3.1 Choose STR in test menu via S. Press E to start up 20-second zeroing and the
screen shows:
Retard to idle（≤1100r/min）
E: continue , S: exit
Ready to test，wait……
keep idle，S :exit
testing，wait……44
keep idle，S : exit
Zeroing，wait……19
S: exit

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4.3.2 After 20-second zeroing ends, the screen shows:
4.3.3 With probe injected into exhaust, the exhaust gas gets into optical path of the
instrument and when the instrument shifts to test state, the screen will show:
After the 45 seconds count-down completes, the air pump does not need to be closed and
could still be able to be tested in order to facilitate observation of changes of vehicle
exhaustion with time going by. It is also connected with computers and could refer to
various instantaneous values through its host machine that can be analysed and treated
by host machine.
4.3.4 Press S and “Taking out probe” appears. After probe is took out, immediately open
zeroing valve and “Zeroing” appears. 60 seconds count-down, shutting off air pump,
cleaning (reverse blowing) sampling tube for 5 seconds, switching off valve, returning to
test menu and showing the average value obtained 30 seconds after count-down.
4.3.5 Choose PRT via S, and press E to PRT maximum, minimum and average value
obtained 30 seconds after count-down.
4.3.6 Press S to choose SAVE and then press E to save the data PRTed in 4.3.5.
4.4 Idle(without tachometer, and when RPM is 0 on screen)
As said above in section 3.8 and 3.5, input number plate of the vehicle to be tested and
select Idle.
4.4.1 Choose STR in test menu via S, and a prompt appears by pressing E:
4.4.2 Press S for 20 seconds countdown, the screen displays:
Put the probe in the exhaust
S : exit
Testing，wait……44
S: exit
Set speed：5000
∧∨ : modify，E :confirm
S: ignore speed
Zeroing，wait……19
S: exit