SISCO SKY3000 Series User manual

ACCURATE • RAPID • RELIABLE
GD400 Explosion Proof
Portable Gas Detector
User Manual
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PLEASE READ CAREFULLY BEFORE USING
Anyone who may use, maintain or repair the instrument should read this operating manual
carefully and only follow the operating manual to achieve the design level. Otherwise the instrument
will not work properly and will cause malfunction and damage to the instrument.
Warning:
▲ The readings beyond the range indicate the concentration of the gas that may or will soon reach
the explosion concentration or the concentration of casualties.
▲ Replacing components can affect the intrinsic safety of the instrument.
▲ It is strictly forbidden to charge the meter in a hazardous area. Users must use the special
charger equipped with this unit.
▲ Do not disassemble, recharge or replace batteries in hazardous locations. ▲ Charging must be
turned off; the instrument must not be operated while charging or exporting data.
▲ Portable products, before entering the danger zone, doing electrostatic release of human body, and then
carries the instrument into the zone.
▲ Do not use the computer's USB interface for communication in hazardous areas. ▲ Old and new
batteries or batteries from different manufacturers cannot be mixed.
Attentions :
To ensure maximum safety and performance, please read and follow the items and conditions
listed below.
● The air intake of the sensor must be kept clean. Blocking the sensor's air intake
may result in readings that are lower than the actual gas concentration .
It is strictly forbidden to use compressed air to clean the air inlet of the sensor to avoid
damage to the sensor.
● Catalytic Principle Flammable Gas Sensor and Infrared Principle Sensor can only
accurately monitor designated gases. It should be noted, however, that the catalytic principle flammable
sensor is not specific to a particular gas and will be able to react to other flammable gases.
● If the instrument is subject to physical impact or high pollution, the calibration
cycle needs to be shortened.
● The sensitivity of flammable gas sensors will be affected by high concentrations
of sulfides, halogen compounds, silicon-containing compounds, and gases containing "mercury" and
"lead", steam, and high temperature organic acid gases. Avoid using them in environments containing the
above chemicals. The instrument, if necessary, must be tested and calibrated after use to avoid affecting
the accuracy of the instrument.
● The instrument is strictly prohibited from being used in a high concentration of
flammable gas for a long time to avoid damage to the flammable sensor. If it is necessary, the
instrument should be tested and calibrated after use to avoid affecting the accuracy of the instrument.
If the flammable sensor is damaged, it needs to be replaced with a new one. The new sensor can
only be reused after it has been calibrated.
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Do not use organic solvents, soap or silicon-containing solutions to clean the instrument to avoid damaging
the sensor.
●When sampling with a sampling tube, do not use a sampling tube made of silicone material or other
sampling tubes that are not certified by the special source.
●A sudden change in air pressure or a blocked air circuit may cause temporary fluctuations in the
instrument's oxygen readings.
●Large changes in pressure will result in incorrect readings. If the measured gas pressure is greater than
10% of the atmospheric pressure, it will affect the instrument reading and even damage the sensor. The
instrument should be re-calibrated and the measured gas should be depressurized.
●It is forbidden to artificially use the gas shock sensor that exceeds the range of the instrument. If the
over-range high-concentration gas impact occurs, the instrument must be re-calibrated.
● When replacing any one of the sensors, the instrument needs to be calibrated.
●Standard gas should be selected from the manufacturer or the nationally qualified enterprise.
●The calibration should be in a well ventilated environment to avoid contamination.
●It is strictly forbidden to calibrate the instrument under the condition of insuffcient power supply.
● Do not use the instrument in an oxygen-rich environment.
●It is strictly forbidden to replace the components or structures that affect the explosion-proof
performance at will, so as not to affect the explosion-proof performance.
●It is forbidden to expose the instrument to high concentration acid and alkali gas to avoid damage to
the sensor.
● It is strictly forbidden for users to repair or replace parts without authorization.
●A sudden change in temperature can cause the output signal of the infrared sensor to be abnormal.
After the transient is removed, the instrument will resume normal operation and the ambient
temperature change rate should be limited to 2 ° C / min.
●If the gas sample flow rate changes excessively, it will also cause the infrared sensor output signal
to be abnormal. After the transients are removed, the instrument will resume normal operation and
the gas flow rate should be kept below 0.6 L/min.
It is strictly forbidden to expose the infrared sensor to corrosive gas such as hydrogen sulfide. It
is strictly forbidden to cause condensation inside the sensor.
Condensation phenomenon inside sensor is strictly prohibited.
●
●
●
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Calibration Warning:
●Gas detection equipment is a safe life-saving measuring instrument. To ensure
metering accuracy, toxic and catalytic principles flammable gas sensors should be calibrated at least once
every six months, while infrared sensors should be calibrated once a year.
●The gas detector needs to be carefully tested or calibrated after an alarm
occurs.
●This instrument has the function of recording and querying the calibration date.
Please check it frequently. Not only do users need to understand the parameters of the instrument, but
they also need to understand the meaning of the test data obtained.
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2, Product series and models
3, Product characteristic
4, Product description
5, Product configuration
6, Technical specifications
7, Battery charge
8, Operation procedures
9, Power on/off
9.1 Power on
9.2 Power off
10, User interface
10.1 Detection interface
10.2 Status IndicatorIcon
11, Operation overview
11.1 Alarm function checking
11.2 Information checking
11.3 Menu
12, Function
12.1 Fresh air/zero calibration
12.2 Span calibration
12.3 CaIibration interval
13, Alarm setting
13.1 Alarm Iimit
13.2 Alarm mode
13.3 Alarm latched
13.4 Man down alarm
13.4.1 Turn on/off man down alarm
13.4.2 Motion less Time
13.4.3 Sensitivity
13.4.4 Warning time
13.5 Comfort beep
13.5.1 On/off
13.5.2 Time
14, Datalog
14.1 Storage on/off
14.2 Storage interval
14.3 Data type
14.4 Data view
14.5 Data disk
14.6 Full option
14.7 Clear record
15, Monitor set
15.1 Pump on/off
15.2 Unit
15.3 Date and time set
Contents
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15.4 Language
15.5 Display set
15.5.1 Brightness
15.5.2 Auto brightness
15.5.3 Screen rotation
15.5.4 Sleep mode set
15.6 Security and Privacy
15.6.1 Modify Password
15.6.2 Site ID and User ID
15.7 Self-test
15.8 Reset
15.8.1 Reset Sensor
15.8.2 Reset device
15.9 Bluetooth
16, About
16.1 Monitor Information
16.2 Sensor information
16.3 Calibration record
17, Common faults and solutions
18, Terms of Service
18.1 Warranty Commitment
18.2 Fault repair time
18.3 Limited liability guarantee
19, Technical support and manufacturer
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1、Overview
GD400(volatile organic compounds , combustible gas and toxic gas) at the same time and has man
down alarm function. The device has humanized operation functions such as one-
key security detection, one-key storage, automatic image flipping, as well as the man down
alarm function. With optional Bluetooth transmission function, allowing safety personnel to obtain
real-time data and the alarm status, it has obtained international IECEX, ATEX
explosion-proof certification and Chinese explosion-proof certification; As it passed the
antistatic test, and the protection level reaches IP67; With safer product design and the
module design which makes the detection faster, and the compact ergonomic design makes
the device easy carrying.
The explosion-proof grade of the GD400 series is Ex d ia IIC T4 Ga, which is applicable to
the explosive gas mixture zone 0, zone 1, and zone 2 of the factory with grades IIA, IIB, and
ITC and temperature group T1~T4.
2、Product series and models The
SKY3000 series includes:
1. GD400(regular 4-in-1)
2. GD400-M (single gas)
3. GD400-M2 (two composite gases)
3. GD400-M3 {three composite gases)
4. GD400-M4 (unconventional 4-in-1 gas)
3、 Product characteristic
Rugged and durable
The instrument can effectively resist a three-meter drop.
The protection level of the instrument reaches IP67.
The instrument has passed the EMC anti-static interference test and can work normally
in the walkie-talkie environment.
Explosion-proof circuit design, safe and reliable
The instrument has got IECEx, ATEX, Chinese explosion-proof certificates and the
explosion-proof level reaches Ex d ia IIC T4 Ga
Multiple security protection
The man down alarm function has upgraded the safety of underground operators. Password
protection function prevents non-operators from modifying menu parameters. With safety reminder
function, sound and light vibration alarm function, let operators work
without worries.
The high and low alarm latched function allows the operator to better capture the sudden change of
the gas concentration value.
Simultaneous measurement of multiple gases, multiple numerical display The
instrument can detect 1-5 gases at the same time.
Real-time value, TWA, STEL, MAX, MIN multiple numerical display.
Large screen display, flexible detection system, multiple filtering devices
The screen can be automatically turned 180 degrees, which is convenient for viewing in special
operating environments.
Built-in powerful sampling pump, fast detection speed.
Can be connected 20m sampling tube externally, which is convenient for long-distance or
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confined space detection.
With a water trap filter, it can effectively filter water, oil, dust and other impurities. It can also be used in
harsh industrial environments , such as coal mines and petroleum fields.
Powerful function, more user-friendly operation
Beautiful and friendly user interface, reasonable and easy-to-use interactive mode. Optional Bluetooth
function, data can be transmitted to the mobile phone or PC in real
time.
Standard storage function, one-click data export, convenient for users to analyze.
Unique modifiable ID identification function, convenient for users to allocate and manage the instrument.
A full range of automatic detection functions, automatic prompts for voltage, pump failure alarms, etc.
more comfortable to use One-key security detection, one-key open storage, automatic image flip.
Support PPM and mg/m3 gas unit switch, the concentration value is automatically converted
by the system.
Support each channel sensor to restore the factory setting separately. Support multi-Language
including English , Chinese and etc.
4、Product description
(top view)
(left view) (front view) (right view) (back view)
(buttom view)
①Y+key ⑥Gas outlet
②Mode key ⑦Gas inlet
③N-key ⑧Belt clip
④Buzzer ⑨Charging and communication contact
⑤Display ⑩Alarm light
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Sampling method pump suction type
Response time CO、O2、EX<30 seconds，H2S<60 seconds
Language Chinese/English (more language can be custormized)
Automatically test
and calibrate after
power-on
Including reset,maximum value (MAX), minimum value (MIN), STEL, TWA
value
Unit μmol/mol、mg/m³、PPM can be swifted
①[Y/+] key, Long press to turn on or off the datalog function (main interface);
confirm entry/switch (menu interface); Numerical increase (need to enter the numerical interface);
stop ( calibration countdown interface).
②[MODE] key, Long press to power On/off (any interface): Exit (menu interface)
Confirm (need to enter the numerical interface).
③[N/-] key, Long press to enter the main menu (the display interface enters the
menu interface); move down or right options (menu interface).
④Buzzer: Voice prompt and alarm function.
⑤Display, Display gas concentration and various parameters.
⑥Sensor, Measure gas concentration.
⑦Filter, Gas inlet.
⑧Belt clip, Stainless steel material, auxiliary fixing entrainment instrument.
⑨Charging and communication contact: Connect the charging stand to charge the
instrument / transmit data to the PC.
⑩LED light, Light alarm function.
5、 Product configuration
1, Standard accessories :
(1) Gas detector 1 piece
(2) 12V/1A DC power adapter 1 piece
(3) Charge base 1 piece
(4) USB cable 1 piece
(5) User manual 1 piece
(6) warranty card 1 piece
(7) Filter 1 piece
(8) Aluminum suitcase 1 Piece
(9)1 rubber stopper (please install the rubber stopper in time after charging/data
transfer is completed.)
6、 Product specifications
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Display monochrome graphics (160x96) ,screen can be automatically flipped
Backlight The backlight time can be manually set, and will be turned on
automatically when an alarm is issued
Data record Can store 100,000 sets data, the storage interval is adjustable from 5 to 3600
seconds, data can be exported, with data cable
Alarm
95dB buzzer (@30cm), vibration alarm and flashing red LED and alarm status
indication on the screen, alarm latched; diagnostic alarm and battery
undervoltage alarm, pump block alarm; man down alarm, with early warning
and optional real-time remote Bluetooth
Battery 3.7V rechargeable lithium battery
Working hours More than 15 hours in continuous pumping mode
Charger Travel charger with DC interface, charging time = 4 hours
Explosion-proof grade IECEx:Ex da ia IIC T4 Ga(with EX sensor),Ex ia IIC T4 Ga(without EX sensor)
ATEX: II 1G Ex da ia IIC T4 Ga， II 1G Ex ia IIC T4 Ga
Certification
(EU Regulation) 2014/34/EU(ATEX)
Protection grade IP67
Working temperature -20°C~+50°C
Humidity 0~90%RH (no condensation)
Environmental pressure 86~106Kpa
Size 157*84.5*59.5mm (including back clip/water trap filter) (length• width
• height)
Weight 365g(including battery, belt clip and filter)
7、Battery charging
The detector is equipped with special charging equipment, and the charging process is
shown in the figure below.
Charging
stand Indicator
light
USB
interface
Power
interface
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1、First, insert the charging/ communication contact into the charging stand to ensure that
the detector is tightly engaged with the charger stand
2、Then insert the round plug of the power adapter into the jack on one side of the charger
stand, and plug the other end of the power adapter into the power source.
3、The detector is charged after connecting with power source, the LED indicator is red, and
the display shows the charging status. After the battery is fully charged, the display shows that
the battery is fully charged which means the charging is complete.
Note
1. It is forbidden to charge the detector in non-safe areas.
2. Please do not violently plug or unplug the detector and charging equipment.
3. Before charging, check whether there is dirt on the contacts and probes,
whether the contacts on the back of the detector are in good contact with the probes of the
charging stand, and whether the bite is in place.
8、Operation process
Shutdown
No
3 Seconds? Yes Power On Self-test Monitor
Password Check No
Succeed?Yes
Menu
Calibrate Alarm Datalog Monitor About
Fresh air/Zero calib
Span calibrate
Calibration interval
Alarm limit
Alarm mode
Alarm latch Man
down alarm
Confort beep
High alarm value
Low alarm value
STEL alarm value
TWA alarm value
Datalog On/Off
Interval
Data type Data
view Data disk
Full option Clear
record
Pump on/off Unit
Date&time
Language
Display
Security&privac
y Self-test
Reset Bluetooth
Brightness
Auto brightness
Screen rotate
Sleep mode
Reset sensor
Reset device
Monitor info
Calibrate record
Sensor info
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9、Power on/off
9.1 Power on
When the detector is off, press and hold the [MODE] key, the backlight will light up,
and a countdown progress bar will appear on the screen. Release the [MODE] key after the
countdown complete. Then the detector starts, the backlight,alarm light and vibration turn on.
SAFEGAS mark will appear on the screen, and then enter the self-check interface.
CO
PPMPPM
%L EL
H2S
EX
0
0.00
Ch e ck
%VOL
O2
20.9
2s e c
Power on...
Device info
Version:
Site ID:
User ID:
Factory:
V1.2.7
0001
0001
2021-05-20
Sensor info
PPM
%V OL % LE L
100
100
1000
30.0
PPM
O2
CO H 2S
EX
High alarm value
CO
200
H2S
PPMPPM
%VOL %L EL
O2EX
50
20.0
23.5
Low alarm value
CO
PPMPPM
%VOL %L EL
H2S
O2EX
20
10.0
19.5
100
STEL alarm value
CO
PPMPPM
H2S
6.030
TWA alarm value
CO
PPMPPM
H2S
3.020
Storage info
Used: 0.04MB
Usable:14.94MB
59
Sensor is warming up
Calibrate info
Last
The next calib is 180days
Self-test
202 1 -0 5- 2 0
Serial number
SN : 0 1 2 0 1 C 1 7B 0 01
Self-testSelf-test
Self-testSelf-test Self-testSelf-test
Self-test Self-test
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PPM PPM PPM PPM
The normal start up of the detector will gradually display the following steps, showing the
current settings of the instrument:
1. Equipment information: version, site ID, user ID, manufacture date
2. Serial no
3. Sensor information
4. High alarm value
5. Low alarm value
6. STEL
7. TWA
8. Data log information
9. Calibration information
After loading the self-test interface, it will enter the sensor preheating interface, and there will
also be a countdown action. This action takes about 1-2 minutes. After the countdown, the
display interface will prompt whether the detector is performing fresh air/zero calibration.
During the calibration, a 10-second countdown will be displayed, and the calibration
can also be terminated during the process. Once the calibration is completed, it will
formally enter the detection interface and the detector is successfully turned on.
Note:Please keep the battery fully charged and start the machine in a fresh air environment.
If you can't start the machine to eliminate the above problems, please contact sales for
consultation.
9.2 Power Off
Press and hold [MODE] . A 5-second countdown to shutoff begins. You must hold your
finger on the key for the entire shutoff process until the device is powered off.
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PPM PPM
Icon function
Bluetooth function(This is an optional function, shown when bluetooth is on,blank when off) Pump
on status
Pump off status
Storage function ( Shown when storage is on, blank when off)
Power ( three segments show battery charge level)
In the Shutdown state, long press [N/-] key for 3 seconds to briefly display the following
device information
1. Gas type
2. Measure range
3. Power
4. User ID
5. Site ID
Note: Please turn off the device after the reading drops to zero in clean air (except for
oxygen,nitrogen and carbon dioxide)
10、User Interface
10.1 Detection interface
The LCD display provides visual feedback that includes the sensor types, readings,
battery condition, and other functions.
Real-time status
of calibration and
functional test
Sensor type
Air pump
Datalog
Battery status
indicator
Reading
Unit of measure
Soft keys(functions
change by activity)
Wireless Bluetooth
Man down alarm
Che c k
10.2 Status Indicator Icon
CO
PPM
0
1 gas
CO H2S
0.0
PPMPPM
%V OL
O2
0
Check
20.93
3 gas
CO
PPM
PPM
HIGH
Ch e c k
H2S
O2
EX
SO2
0
0.0
20.9
0
0
%VOL
%LEL
PPM
5 gas2 gas
CO
PPM
PPM
H2S
0.0
0
Check
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PPM PPM PPM PPM PPM PPM
PPM PPM
Man down alarm function (Show when man down alarm is on, blank when off)
Self-test passed
Self-test failed
11、Operation overview
11.1 Alarm function checking
On detection interface, press [Y/+] key to test whether the buzzer, vibration alarm,
LED indicator and backlight function are in good condition. The following interface shows when
the buzzer is off.
Note: The premise for the one-key check function to take effect is in normal mode and non-
alarm state.
11.2 Information checking
On detection interface, press the [N/-] key to display the following interfaces in sequence.
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PPM PPM
1. Max value
2. Min value
3. STEL value
4. TWA value
5. Date and time
6. Batter voltage, power, running time
7. User information: Site ID,user ID
When the device is in the above information interface, press the [MODE] key can back to the
detection interface, press the [Y/+] key to clear. After all the information interfaces are displayed,
press the [N/-] key to return to the detection interface.
11.3 Menu
To enter main menu interface, press and hold [N/-] key for 3 seconds until you see the
Password screen.
Input the 4-digit: password
● Increase the number from O through 9 by pressing [Y/+].
● Step from digit to digit by using[N/-] .
● Press[MODE] when you are done.
● If you make a mistake, you can cycle through the digits by pressing [N/-] and
then using [Y/+] to change the number in each position.
● If you input the correct password, you will enter the main menu. If you input the
wrong password, you will enter the mistake prompt interface. Press [N/-] key and select No
to back to display interface. Press [Y/+] key to back to password screen.
Note:The default password is 1234. The password screen only appears when you enter the
main menu at the first time. If you have input the correct password, you do not have to input it
again to enter main menu until you turn the device off and on again.
12、Functions
12.1 Fresh Air/ Zero Calibration
At the Calibration menu, press [N/-] key to select the sensor and then start the calibration
by pressing [Y/+] , then there is a 30 seconds of countdown, the device will send a buzzer
sound. The calibration is done when the screen shows you a Succeed.
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PPM PPMPPM PPM
PPM PPM
You can terminate the calibration at any time during the countdown by pressing [Y/+] .If the
calibration is succeed, it will show av beside the calibrated gas, if the calibration is failed,it will
show √ beside the calibrated gas.
Note: 1. Sensor should be calibrated in the dry air with 20.9% of oxygen and no impurities.
2. The zero point calibration should be done before the span calibration.
12.2 Span Calibration
GD400 draws in air at a flow rate of between450mL/min -650mL/min When calibration, the
device must be connected to a standard gas cylinder through a T-shaped calibration tube
(three-way connector), and the other end is connected to a flow meter. During ventilation
calibration, ensure that the evacuation of the flow meter is above l00mL/min.
Standard
gas
Pressure reducing
valve flow meter
T-junction
Teflo tube
Emptying
Flowmeter
● Press [N/-] to select the gas,then press [Y/+] to enter selected gas calibration screen.
Processing
30Sec
Span calibrate
CO
PPMPPM
%VOL %L EL
H2S
O2EX
En t er
0
0.0
20. 9
0
Exit
CO
ADC
Calibrate
Ex i t En t e r
0 PPM
0
00000000
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There is a calibrate in the span calibration sub-interface, and the right side is the
calibration setting value. The upper part displays the current gas type, real-time concentration
value, unit and ADC value.
The span calibration procedure is as follows (the following example assumes a standard
gas of 550 ppm CO):
●After the detector is turned on and enters the detection interface, connect the
standard gas of known concentration to the gas inlet of the detector through the PTFE
tube.
●Enter the span calibration interface, press the [N/-] key to select the gas
channel, and press the [Y/+] key to enter the “span Calibration ” submenu.
●Press - the [Y/+] key to enter the parameter setting mode, and modify the value
(set value 550) on the right to the standard gas concentration used.
●Open the standard gas valve, and input the target CO standard gas to the
detector at a flow rate of 500mL/min (ml/min), until the real-time concentration displayed by
the detector (the upper middle) is basically stable (about 1-3 minutes, different sensors the
stabilization time is different), press the button, the detector will enter the 30-second
countdown, after the countdown, the detector will have a buzzer sound, and the screen will
show succeed to tell you the span calibration is completed.
Note：
1. During the calibration countdown period, you can press the [Y /+] key to
terminate the span calibration.
2. Before the span calibration, please confirm that the standard gas tube has
been well connected. Only starts the span calibration after the displayed value is stable,
otherwise the reading will be inaccurate.
3. Setting value: input the concentration of the standard gas.
4. When selecting the calibration point, please follow the principle of zero point
value< calibration value < full range value, otherwise calibration will fail.
Fai l e d
Sto p
Pro c e s si n g
10S e c
End S u c c e ed
CO
ADC
Calibrate
45 0 PPM
0
00000550
OK
CO
ADC
Calibrate
Ex i t Enter
55 0 PPM
0
00000550
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PPMPPM
12.3 Calibration interval
It is used to remind the user that the device needs to be re-calibrated. The factory default
calibration interval is 180 days (the setting range is 0-360 days). If the calibration expires, it will
remind the user that the device needs to be re-calibrated when you power on.
Calibration interval setting,
●Press [Y/+] to change the number.
●Press [N/-] to move digit.
●Press [MODE] to complete.
13、Alarm setting
13 .1 Alarm limit
There are 4 alarm settings for every type of gas as following:
●High alarm value ( High alarm point)
●Low alarm value (Low alarm point)
●STEL value (Short-term exposure limit)
●TWA value (Weighted average)
Take setting the high alarm limit as an example, press the [Y/+] key on the alarm limit
setting interface to enter the high alarm limit interface.
High alarm limit setting,
● Press [Y/+] to change the number.
● Press [N/-] to move digit.
● Press [MODE] to complete.
Evaluation using the short-term exposure tolerable concentration (PC-STEL)
standard
The test result is the 15min time-weighted average concentration of hazardous substances
measured at the highest concentration of hazardous substances at the operation site. The
calculation method of the 15min time-weighted average
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concentration is:
(1) When the sampling time is 15min, the time-weighted average concentration of
15min is the test result of the sample, mg/m3.
(2) When the sampling time is less than 15min, when sampling more than once,
calculate as follows:CSTEL=(C1T1+C2T2+....CnTn)/15
In the formula: CSTEL-15min time-weighted average concentration, mg/m3;
C1, C2, Cn-measured concentration of harmful substances in the air, mg/m3;
T1, T2, Tn - the working time of workers at the corresponding concentration of
harmful substances, min.
The time-weighted average allowable concentration (PC-TWA) standard was
used to evaluate
The test result is the 8-hour time-weighted average concentration of occupational
disease hazard factors in the workplace. The 8-hour time-weighted average
concentration is calculated as follows: CTWA=(C1T1+C2T2+. …CnTn)/8
In the formula: CTWA - 8h time-weighted average concentration of harmful
substances in the air, mg/m3;
C1, C2, Cn-measured concentration of harmful substances in the air, mg/m3;
T1, T2, Tn - the working time of workers under the corresponding concentration of
harmful substances, hour
Use the maximum overrun multiple to evaluate
Many substances with PC-TWA have not yet formulated PC-STEL. For dust and
chemicals without PC-STEL, the upper drift limit should be controlled even if their 8h
TWA does not exceed PC-TWA. Therefore, the over-limit multiple can be used to
control the excessive fluctuation of its short-time exposure level. The concentration
corresponding to the exceeding multiple is the short-term exposure concentration,
and the sampling and detection methods are the same as those of PC-STEL. For
chemically harmful factors for which PC-STEL is not formulated, the concentration of
any short-term (15min) exposure should not exceed the multiple of PC-TWA under
the condition of the 8h time-weighted average allowable concentration.
Calculation of overrun multiples: Overrun multiple = C15min/PC-TWA
In the formula: C15min—measured short-term harmful substance concentration in
the air, mg/m3;PC-TWA—The time-weighted average allowable concentration of the
hazardous substance.
Note:
1. The low alarm value can't be higher than the high alarm value.
2. The low alarm value or high alarm value can't be higher than measure range.
3. There is no STEL value and TWA value for oxygen and combustible gas.
13.2 Alarm mode
There are three alarm modes including LED light, buzzer,
and vibrator. The user can switch on or off the three mode by
pressing the [Y/+] .
Note: The three alarm modes of the device are turned on by
default. Do not turn off them unless necessary.
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