SENKO sp2nd User manual

MODEL: SP2nd
(Portable Single Gas Detector)
Operating Manual

Product Introduction
SP2nd is Simple Gas Alarm Detector that is required to protect users’ safety at
dangerous work environments where an explosion accident can occur. The
apparatus can indicate simultaneously the concentration of gases (Oxygen,
Carbon Monoxide, Hydrogen Sulfide, Hydrogen, Sulfur Dioxide, Hydrogen
Chloride, Ammonia and etc.) on a digital LCD monitor, and the methods of
operation and calibration are easy and convenient.
This instrument alerts accurately the alarm circumstances to operators and
workers for their safety with its functions of loud alarm sound and vibration,
when higher gas concentration than normality is detected. Besides, it is
available for users to check upon occasion and adjust the value of alarm to the
work environment on demand, since it has the function of indicating minimal
and maximal concentration of the gases. It is also possible to prevent in
advance workers from the danger of exposing for a definite period of time to
such toxic gases as Hydrogen Sulfide (H2S), Carbon Monoxide (CO) and Sulfur
Dioxide (SO2) by its function of STEL (Short Term Exposure Limit) and TWA (Time
Weighted Average).
Guarantee and Repair
Senko Co., Ltd. guarantees the products of SP series for 24 months from the
shipping date and repairs or replaces the defected product during warranty
period at no cost. Nevertheless, Senko is not responsible for the following cases
and would not repair or replace the product at no cost, such cases as the product
has been purchased through the route that Senko does not approve, or as the
product has been damaged or deformed mechanically by misuse of the user, or
as the product has not been calibrated or replaced the parts according to
processes in the operating manual.
In the event that any defect or issue of the product occurred during warranty
period, Senko will cover all the expenses except transportation fee. After the
period of warranty, the expenses of repair or replacement of the product and
transportation will be in principle borne by the user. Senko will not be
responsible for any indirect occurrence or accident and/or damage during the
use of the product, and the guarantee shall be limited to the replacement of parts
and product. The guarantee is applied only to the users who purchased the
product at Senko’s authorized dealers or agents, and the guarantied repair is to
be performed by the expert engineers of Senko’s authorized aftercare center.
1

Contents of Operating Manual
Product Specification ------------------------------------3
Names and Functions of Exterior -----------------------4
Start of Operation ---------------------------------------5
Operation Method ---------------------------------------6
Calibration ------------------------------------------------7
Method of Alarm Set and Display ----------------------9
Applicable Battery and External Pump ---------------12
Battery & Sensor replacement-------------------------13
Operation Flow Chart ----------------------------------14
Notice for User -----------------------------------------15
2

Product Specification
Power Source
AA Size Alkaline Battery, 1 ea
Continuous
Operation Time
Available to Operate for 5 hours or longer
Applicable
Temperature &
Humidity
-20°C ~ + 50°C, 0to 95%RH
Exterior
Dimension: 34mm(W) x 270mm(H) x 47 mm(D)
Weight: 200g (Including )
Sampling Flux
0.5 liter / minute
Diagnosis Function
Deadlock Alarm, Alert of Insufficient (Red LEC Display)
Specification of External Pump (Optional)
Model
SP2217
SP2227
SP2257
SP2277
SP2297
Measured Gas
O2
CO
SO2
H2
H2S
0~30%
0~500ppm
0~1,000ppm
0~20ppm
0~100ppm
0~20ppm
0~100ppm
0~100ppm
0~200ppm
Measurement
Method
Electrochemical Type
Principle of
Measurement
Diffusion Type
Monitor
Custom-made Digital LCD
Alarm
90dB
Alert Lamp
Red LED
Vibration Alert
Vibration Alarm
Power Source
CR2
Applicable
Temperature &
Humidity
-20℃~ +50℃, : 10% ~ 95%RH (non-condensing)
Explosion-Proof
EEx ia IIC T4 / IP67
Case
Rubber PC Case
Standard
Accessories
Belt Clip, Calibration Cap
Optional
Accessories
Small-Sized Pump for Sampling
Exterior
Dimension : 54mm(W) x 91mm(H) x 32 mm(D)
Weight :120g (Including )
3

Names and Functions of Exterior
LCD display symbols
1. Gas sensor
2. Buzzer
3. LCD display
4. On/Off Key
5. Key
6. Alarm LED
7. Fastening clip
8. Type label
1
2
3
4
5
6
7
8
4

Press Power key for 3 seconds, and power is turned on displaying 3, 2,
and 1 in order on the monitor. (Power won’t turned on, if pressing the
Power key is stopped before 3 seconds)
Afterwards during the instrument is being stabilized, the countdown of 10. 9, 8,…………..2, 1
appears on the screen, and the program is converted to Gas Detection Mode with alarm sound
and vibration
Instrument Power-On
When the instrument is stabilized after the display of the above set values, it converts to Gas
Detection Mode displaying the mark . At normal status, the mark disappears after blinking
5 times, and the concentration of the gas detected of the moment is indicated. In the event that
stabilization of the instrument fails, it would not convert to Gas Detection Mode, blinking the
mark with the alarm sound. In this case, calibration of the sensor or aftercare of the
instrument is required.
Press Power key for 5 seconds, and power is turned off displaying 5, 4, 3,
2 and 1 in order on the monitor with and the alarm sound.
Instrument Power-Off
Caution: Appropriate calibration of the instrument is always required prior to the operation at
work sites. Make sure if the instrument makes the proper detection response to the pertinent
gas and if the region of the gas detection is not blocked with foreign materials that interfere
with the gas detection.
LCD Back Light At the state of Gas Detection Mode indicating the concentration of
gases simultaneously, LED Backlight is turned on by the short press on
Arrow key, that enables the operator to view the measured value even
at dark atmosphere. It is turned off by pressing again once more.
Backlight will be automatically turned off after 30 seconds unless the
button works.
Pass Fail
Start of Operation
5

Detection Mode
The instrument is converted to Gas Measure Mode as below, when
power is turned on.
Gas Measure Mode indicates the concentration of gas and the
remained capacity of battery on LCD, and it displays the gas
concentration of Oxygen by %, and such toxic gases as H2S, CO
and SO2 by ppm units.
In the event that the concentration of gas changes, it indicates the
value of concentration in real-time. If it exceeds the 1st Alarm or 2nd Alarm standard (or STEL /
TWA), the measured value and icon or icon (STEL, TWA icon in case of STEL / TWA) blinks
periodically with the alerts by alarm sound and vibration.
When the operator moves to the safe place where the concentration value of the measured
gas is the normal state, the concentration value reduces and the alarm stops. (Even if the
operator escapes to a safe area after the alarm alerts, the icon of alarm remains on the
screen, and it will disappear only after confirming the value by pressing Power key.
When the concentration value of the measured gas exceeds the maximum measuring
range, it is indicated as the maximum value. And LED, alarm sound and vibration
applicable to 2nd Alarm Standard operate together.
Indication of Peak Value and TWA & STEL Value
At Gas Measure Mode, in case of Oxygen, the measured maximum and minimum values are
displayed in order. And in case of Toxic Gases, maximum value, TWA value and STEL value
are displayed consecutively.
Program returns to Measure Mode, when Arrow key is pressed at state displaying Peak, TWA
and STEL. If the button is not touched for 10 seconds, the program will return to Gas
Measure Mode.
Operation Method
Example) In case of Oxygen Measure Instrument
6

Caution: Senko Co., Ltd. performs the initial calibration before the shipment. Incorrectly
calibrated value can reduce the accuracy of the product, as the calibrated value is stored in
the instrument. Calibration is in general to be performed monthly or quarterly, and can be
adjusted according to frequency of the use.
Fresh air Calibration
icon blinks when Power key is pressed for 3 seconds at the state of pressing Arrow key
simultaneously.
Program will enter to Calibration Mode of Standby State. When Calibration starts, countdown 10, 9,
8………….3, 2, 1 continues for 10 seconds and Calibration will be completed. If Calibration is
completed normally, it returns to Gas Measure Mode after 3 times blinking of icon with alarm
sound.
If Standby State Calibration failed, icon blinks continuously with alarm sound. If this
occurrence repeats, please consult a dealer or aftercare center to replace the sensor.
Calibration
Calibration success
Calibration fail
10secs count down
7

Standard Gas Calibration
Icon blinks when Power key is pressed for 3 seconds at the state of pushing Arrow key
simultaneously. And icon blinks by input of Arrow key at the state. Standard Gas Calibration
starts by pressing Power key for longer than 5 seconds. Be careful not to proceed with
Calibration at the state without connecting with Standard Gas.
Caution: Fresh Gas Calibration should be performed at the environment of fresh air without
any influence of other gases, since the calibration is performed on the assumption that the
concentration of Oxygen is 20.9%, that of Inflammable Gas is 0%LEL, and the concentration
of Toxic Gas is 0ppm in the fresh air. Accordingly it is not recommended to perform Fresh
Air Calibration at the closed space, and it should be avoided to perform the calibration
where gases can be inhaled by operators.
When Standard Gas Calibration starts, in case of Oxygen, Calibration proceeds by the
countdown for 60 seconds. If the Calibration is normally executed, the concentration value of
the gas connected at the moment is indicated with blinking of icon and alarm sound.
Afterwards, it indicates the concentration value measured at the moment, when Standard Gas
is disconnected. If the Calibration fails, program returns to Gas Measure Mode after blinking
of icon for 3 seconds with alarm sound. In this case, icon blinks continuously. If this
occurrence repeats, please consult a dealer or aftercare center to replace the sensor.
Calibration
Success
Hold 5 secs
60secs count down Concentration of
Standard gas
Disconnect from
standard gas
60secs count down
Calibration
Fail
8

Concentration of Calibration Gas Set to Instrument
Gas
Oxygen
Carbon
Monoxide
Hydrogen
Sulfide
Hydrogen
Sulfur
Dioxide
Concentration
0%
100ppm
50ppm
500ppm
10ppm
Method of Alarm Set up and Display
Caution: The value of alarm of the instrument is set according to the alarm standard of each
gas that is required by international standard. Therefore alarm value of the relevant gas can
be changed under the responsibility and approval of the administrator of the work site
where the instrument is used.
Alarm
Alarm Standard
LCD Display
Alarm & Vibration Display
1st Alarm
In Exceeding Alarm Value
Set Primarily
Displaying Icon &
Concentration
2nd Alarm
In Exceeding Alarm Value
Set Secondarily
Displaying Icon &
Concentration
TWA
In Exceeding Exposure
Concentration for 8 hour
Displaying Icon TWA &
Concentration
STEL
In Exceeding Exposure
Concentration for
15 minutes
Displaying Icon STEL &
Concentration
Dead
Battery Capacity is
Exhausted.
Blinking of Battery
Test Failure
Failure of Sensor Test
Failure of Calibration
Displaying Icon
Alarm Display
Buzzer, LED,
LCD Backlight
9

When the 1st alarm occurs, and the operator recognizes it and presses Power key, only the alarm
sound stops, remaining LED alarm as the operation stale.
When the 2nd alarm happens, the operator and workers should promptly escape from the work
site. The alarm will stop, when power key is pressed at the place where the concentration value of
gas is normal (Alarm alerts continuously even if the Power key pressed, when it does not return to
the normal status.)
When STEL / TWA alarm occurs, it is indicated with the value of the measured concentration
and alerts alarms of the same sound of alarm and vibration as that of the 2nd alarm.
When STEL / TWA alarm occurs, the icon can be deleted only by Power Off.
Primary battery alarm sounds repeatedly at 5 minute intervals when only a bar of battery icon is
remained.
Secondary battery alarm starts right before the end of power, and the power source finishes after
10 seconds from the outbreak of alarm.
In the event of failure of test or calibration, the icon is displayed with the sound of alarm.
Gas O2CO H2S H2SO2
1st 19% 30 ppm 10 ppm 100 ppm 2 ppm
2nd 23% 60 ppm 20 ppm 500 ppm 4 ppm
TWA N/A 30 ppm 10 ppm N/A 2 ppm
STEL N/A 200 ppm 15 ppm N/A 5 ppm
Alarm Set Point
Alarm Set
When Arrow key is pressed for 3 seconds at the state of power off, program enters to 1st
Alarm Set Mode with blinking of icon . It approaches to 1st Alarm Change Mode by
pressing Power key, and moves to 2nd Alarm Set Mode with blinking icon by pressing Arrow
key. If you want to return it to Gas Measure Mode without changing Alarm Set Value, it can
move by Arrow key.
Hold 3 secs
10

Program returns to 1st Alarm Set Mode that is the initial Alarm Set Mode, after setting up 1st
Alarm value. It can approach to 2nd Alarm Set Mode or return to Gas Measure Mode. The way
of setting 2nd Alarm is same as the method of setting 1st Alarm.
Hold 3 secs
10 secs count down
When the program returns to Gas Measure Mode after 2nd Alarm Set Mode, 10 seconds
countdown proceeds with alarm sound. It will be changed to Gas Measure Mode with alarm
sound and vibration, when the countdown finishes.
When Arrow key is pressed after entering to Alarm Value Set Mode, the first digit number will
move upward by each 1 step. And blinking 2nd number moves the position by pressing Power
key. If you press Arrow key, the number moves upward, and the 3rd number blinks and moves
the position by pressing Power key. It returns to Alarm Value Set Mode with alarm sound,
when Power key is pressed after changing the last digit is completed.
Method of Alarm Value Input
Example) To change 1st Alarm Value from 19.5% to 19.0%
11

Caution: It is absolutely prohibited to replace battery at potential explosion areas or
dangerous regions. Specification of the applicable rechargeable battery and
disposable battery is as below.
- Disposable Alkaline Battery: 3V lithium CR2 battery
If the battery of other specification, It is not permitted to use it for the instrument at
dangerous regions
Applicable Battery
Warning: Explosion can occur, when a battery is thrown into fire or disassembled
with force. Disposal of the used battery should be performed according to the
guide of the pertinent country or the work site.
External Pump (Optional)
key has the function of On/Off, and the
state of operation or trouble of the instrument
can be recognized by LED lamp.
When the leakage measurement or the
measurement of concentration by inhalation of
gas is required, it is available to measure gas
concentration and leakage at the pertinent place
by connecting the pump to the instrument.
Prior to use, make sure that the instrument is
tightly attached to the probe cover which is
connected to the sensor.
Please note that External Pump is the optional
product that can be provided by the separate
order.
12

Battery & Sensor replacement
When you replace the Battery and sensors of SP2nd, you need some instrument and components as
below.
Warning : - It is absolutely prohibited to replace battery at potential explosion areas
or dangerous regions.
- Replacement of components can be damage to intrinsic safety function.
- The sensors published by SENKO should be used for replacement. Unsuitable
function could be shown if another sensors use for replacement..
- Disassembly should be necessary only for sensors & battery replacement. After
the sensor replacement, the span gas calibration should be done.
- Instrument : + driver
- Battery : 3V lithium CR2 battery
- Sensors for replacement : Senko SS series
- Filters for replacement
Disassembly
- Turn off the power.
- Replace the sensor and battery , please refer to below drawing.
- After replacement, check the sensor fail and battery working.
2
1
3
4
57
6
8
9
1. Label(Membrane)
2. Calibration Cap
3. Front Cover
4. Sensor
5. PCB
6. Battery
7. Rear Cover
8. Belt clip
9. Machine Screw
13

Operation Flow Chart
14

Please use the instrument in the range of the applicable temperature, humidity and
pressure that are appropriate for the specification of the product. Using the
instrument beyond this range may cause malfunction or glitch of the instrument. .
Notice for User
Gas concentration measurement value by the sensor or the instrument can vary
according to the environment at site (temperature, pressure and humidity). Therefore
the calibration of the instrument should be performed at the same or similar
environment as that of the instrument use (temperature, pressure and humidity),
If temperature changes sharply during use of the instrument (for instance, using the
instrument at places of far different temperatures between indoor and outdoor), the
value of the measured gas concentration can be changed suddenly. Please use it
after the gas concentration value is stabilized. .
Severe vibration or shock to the instrument may cause the sudden change of value
of the measured gas concentration. Please use it after the value of gas concentration
is stabilized. Excessive shock to the unit can lead to trouble of the sensor or the
instrument.
15
Ex-Ox-Tox Gasdetectie
Westerdreef 5V
2152 CS Nieuw-Vennep
Telefoon: 0252 620885
E-mail: [email protected]l
Website: www.exoxtox.nl