SENKO SP secure User manual

MODEL: SP secure
(Combustible Gas Leakage Detector)
Operating Manual

1
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.
For the safety of users, workers and operators are to be fully alerted about the
alarm circumstances by the loud alarm sound and warning icon displayed on
LCD monitor when gas concentration is detected in excess of regulatory
standard. In addition, a suction pump is built-in it and also featured with the
function of On/Off for the pump and alarm sound so that the user can set up
alarm values to properly meet with the circumstances involved and the alarm
value such set up can be adjusted to best fit to the type of gas and
circumstances of leakage. SP Secure provides quick response to inflammable
gas and also prevents in advance workers from the explosion by the leakage of
gas and high risk of asphyxiation that may be resulted by the exposure to toxic
gas for a certain period of time.
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.
Guarantee and Repair
Introduction
SP Secure is a portable gas leakage detector necessary to secure user’s safety
and protect industrial facilities by detecting leakage of gas in earlier stage at the
dangerous work environment where risk of explosion always exists. As it is
configured with two buttons only, the method of operation and sensor
calibration is easy and convenient. Also the %LEL and concentration value of
inflammable gas (LPG / LNG, hydrogen, etc) can be displayed on a digital LCD
monitor.

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 Power for Recharge -------- 12
Battery & Sensor replacement ---------------------- 13
Operation Flow Chart --------------------------------- 14
Notice for User --------------------------------------- 16
2

Product Specification
Model
SP secure
Detecting Gas
LNG, LPG
Hydrogen(H2)
Sampling
Method
Internal Sampling Pump,
flow rate 0.5 liter/min.
Internal Sampling Pump,
flow rate 0.5 liter/min.
Sensor Type
Catalytic
Electrochemical
Detecting
Range
0~100%LEL
0~1000 ppm
0~2000 ppm
Response
Time
5 sec.
5 sec.
Resolution
50 ppm
1 ppm
Display
Digital LCD(Alarm, Buzzer,
Pump On-off, Battery)
Digital LCD(Alarm, Buzzer, Pump
On-off, Battery)
Alarm
Buzzer alarm & LCD Display
Buzzer alarm & LCD Display
Gas
Concentration
Display
0~1% LEL –digital bar
1~100% LEL –numerical display
0~20 ppm –digital bar
0~1,000 ppm –numerical display
Explosion
Proof
Sensor : Ex d IIC T6
Detector : Ex ia IIC T4
Ex ia IIC T4
Operating
Temperature
-20˚C ~ 50˚C
-20˚C ~ 50˚C
Power
Recharger or AA Alkaline battery
3ea
Recharger or AA Alkaline battery
3ea
Continuous
Operation
More than 12 hours
More than 16 hours
Dimensions /
Weight
55m(W) x 241mm(H) x33 mm(D)
/260g
55m(W) x 241mm(H) x33 mm(D)
/260g
Options
Extension Probe and Charger
adapter
Extension Probe and Charger
adapter
3

Names and Functions of Exterior
LCD display symbols
1. Gas sensor
2. Buzzer
3. LCD display
4. Gas type
5. Gas outlet
6. Gas inlet filter
7. Gas inlet probe
8. On/Off key
Pump On/Off key
9. Buzzer On/Off key
10. Battery cover
1
2
3
4
5
6
7
8
9
10
4

Press Power Key and power is turned on displaying 3,2 and 1 in order and
all icons on LCD shall be blinking three times. Afterwards during the device
is being stabilized, countdown, (30,29,28…down to….3,2,1), is displayed on
the screen. When stabilization of the device is completed, mark appears
with alarm sound and then converted to Gas Detection Mode.
Power-On of Device
Under normal status, mark disappears in about 30 seconds and
concentration of the gas detected of the moment is indicated. In the
events that stabilization of the device fails, it would not convert to Gas
Detection Mode, blinking the mark with alarm sound. In this case,
calibration of sensor or A/S of the device is required.
Press Power Key for 3 seconds and the digit 3,2 and 1 shall appear on
the monitor in turn. After then power is turned off with alarm sound
displaying all icons on LCD monitor.
Power Off of the Device
Caution : Appropriate calibration of the device is always required prior to operation at the
work site. Make sure if the device shows proper response to the pertinent gas and if the part
sucking gas is not blocked with foreign materials that interfere the gas detection.
Test Success Test Fail
Start of Operation
5

Measure Mode In case of LPG/LNG Detector, the device is converted to Gas Measure
Mode as shown below when power button is turned on. Gas Measure
Mode indicates the concentration of gas, operating status of suction
pump, alarm sound On/Off status, battery level on LCD and it displays
the concentration of flammable gas by %LEL and by PPM unit for
Hydrogen. In the event that gases are detected, it indicates the value
of concentration in real time and, if it exceeds the 1st and 2nd alarm
standard, the measured value shall be displayed blinking repeatedly
along with mark and LO or HI indication.
The gas leakage detector raises an alarm along with digital bar when gas leakage is
detected even in small amount, and the concentration value shall be reduced and alarm
also shall be ceased when moved out to safe region where normal concentration value is
measured. The alarm sound raised by the detection in the beginning stage can be
stopped (OFF) with the Alarm Sound Off Button but the 1st and 2nd alarm sound can not
be stopped. (Once alarm sound is raised, the mark shall not be disappeared
even though the device is moved out to safe region (Can delete it by the OFF of Power
Key). When the concentration value of the gas measured exceeds the maximum
measuring range, it is indicated as the max value and it will be kept blink with one second
interval. Also alarm sound relevant to the standard of 2nd alarm shall be raised along with
indication.
ON/OFF function of Suction Pump and Alarm Sound
Suction pump is set to turn ON when power key is pressed. Press power key one more time
to OFF suction pump. When power key is input once again, the function of suction pump
returns to ON state as initially set. Alarm sound is also set to turn ON state when power key
is pressed. All the following operations for ON/OFF of the Alarm Sound can be performed
in the same way as that for suction pump above by using Alarm Sound key.
Method of Operation
Caution: Gas leakage detection can not be properly performed if the Suction Pump key is laid
in OFF state. As the setting of OFF mode is to save battery while the device is not in service,
Suction Pump has to be set ON all the time during the measure of gas leakage.
6

Caution : The initial calibration before delivery of the product is performed by Senko Co. Ltd.
As the calibrated values are stored in the device, incorrect calibration may reduce the
accuracy of the product. Calibration is to be performed on monthly or quarterly basis in
general. However, it can be adjusted depending on the frequency of use of the device.
Fresh air Calibration
icons shall blink if buzzer key is pressed for 3 seconds under the state power key is pressed
simultaneously. Press power key at this state to enter into standby calibration mode. Calibration
shall be completed in 10 second while processing countdown from 10,9,8…down to 3,2,1. When
calibration is successfully completed, it returns to Gas Measure Mode with alarm sound after the
icons being blinked for 3 seconds. In case standby calibration is failed, it returns to Gas
Measure Mode with alarm sound after the icons being blinked for 3 seconds but the icons
shall remain appeared in this case. If such occurrence happens repeatedly, please contact our
agent or A/S center as the sensor is required to be replaced.
Calibration
Calibration Success
10 sec. count down
7
Calibration Fail

Standard Gas Calibration
icons shall blink when arrow key is pressed for 3 seconds under the state power key is
pressed simultaneously. icons shall blink when arrow key is input at this state. Standard gas
calibration is initiated by pressing power key for 5 seconds at this time. Please be careful not to
process calibration under the state that standard gas is not connected.
Caution : As the calibration is conducted under the assumption that the concentration of
oxygen in fresh air is 29.9% and that of flammable gas is 0%LEL and the same of toxic gas is
0ppm, the fresh air calibration must be conducted in fresh air where no influences of other
gases are effective. Hence, it is not desirable conducting fresh air calibration in a closed
space and should be very careful not to conduct under the working environment where
gases can be inhaled by workers or operators.
Once standard gas calibration is initiated, calibration shall be processed during the
countdown for 20 seconds. In case calibration is normally processed, the icons shall blink
with alarm sound and the concentration value of the gas connected for the moment shall be
indicated. After then, when the connection of standard gas is blocked, the value of
concentration measured for the moment shall be indicated. In case calibration is failed, it will
return to Gas Measure Mode with alarm sound after the icons being blinked for 3 seconds.
In this case, icons shall not be disappeared but kept appeared. If such occurrence happens
repeatedly, please make inquiry with our agent or A/S center as the sensor is required to be
replaced.
Hold 5 sec.
20 sec. count down
8
Calibration Success
Calibration Fail

Concentration of calibration gas for device
Gas Combustible gas Hydrogen
Concentration 10%LEL 500 ppm
Method of Alarm Set Up and Display
Caution : The values set for alarm of the device are set in conformity with the alarming
standards internationally required by gases. Therefore, the set value for alarm by gases can
be modified by the approval of the manager responsible for the area where the device is
used.
Alarm
Standard for Alar
m
LCD Display
Alarm Sound
1st Alarm
When exceeding
the value set for
1st alarm
and
indicates LO
2nd Alarm
When exceeding
the value set for
2nd alarm
and
indicates HI
Low
One level only
left unused
Blinking
Battery
Dead
is exhausted
Blinking
Battery
Test Failure
Failure of sensor
test
Failure of calibra
tion
Displays
Icon
Indication of Alarm
9

In case 1st alarm is raised and power key is pressed by a worker or operator who perceived the
status of 1st alarm, the alarm sound only shall be stopped but the device shall still remain in
operation state. When 2nd alarm is raised, the workers should quickly escape from the work
site to safe region. Termination of alarm in this case is possible only by turning power key Off
at a place where gas concentration indicates normal value (Alarm shall be continuously raised
unless the power key is turned off at an area of normal concentration value). The alarm sound
of 1st battery is same as that of the 1st alarm and, when power key is pressed, the alarm and
vibration only shall be ceased but icons shall be kept blinking.
The alarm sound of 2nd battery is same as that of 2nd alarm and the blink of icons can not be
deleted by the users. The alarm and power shall be off 10 seconds after the raise of alarm. In
case of failure of test and calibration, icons shall blink with alarm sound.
Gas Combustible gas Hydrogen
1st 20% 100 ppm
2nd 40% 500 ppm
Alarm Set Point
Alarm Set Up
When power key and buzzer key is pressed for 3 seconds under the state of power OFF,
icons shall appear blinking on LCD and indicates LO. Press power key one more
time under this state to enter into alarm set up mode. When power key is pressed at this
point, system shall be entering into the 1st alarm change mode and, when buzzer key is
pressed, HI shall be displayed on the monitor and then moves to the 2nd alarm set up mode.
In order to return to Gas Measure Mode without changing alarm set value, use buzzer key to
move.
Hold 3 sec.
10

After setting the 1st alarm value, returns to the 1st alarm set up mode that is the alarm mode
initially set. Use arrow key to enter into the 2nd alarm set up mode or to return to Gas Measure
Mode. Method of 2nd alarm set up is same as that of the 1st alarm setting.
30 sec. count down
While returning to Gas Measure Mode through the 2nd alarm set up mode, countdown shall be
proceeded for 30 seconds with alarm sound. When countdown is completed, system shall be
converted to Gas Measure Mode with alarm sound and vibration.
After entering into alarm value set up mode, when the buzzer key is pressed, the 1st number
shall blink and goes up by 1 after 1. When power key is pressed, the second number shall be
blinking after moving to next position. In order to have the 3rd number blink, use arrow key to
increase the number and use power key to move to the position wanted. After completing
change of number to the last one, the system shall return to Alarm Value Set Up mode with
alarm sound by inputting power key.
Method of Entering Alarm Values.
Example) Modification of the 1st alarm value of inflammable gas from 25% to 20%
Hold 3 sec.
%LEL
LPG
11

Caution :
It is absolutely prohibited to replace battery at potential explosion areas or dangerous
regions.
Specifications of the batteries applicable to this device are as follows.
- Disposable alkaline battery : Energizer No. E91, Energizer No.EN91
- Rechargeable battery : GP batteries No. GP210AAHCB
Batteries other than specified above are not allowed to use in dangerous area.
Applicable Battery
Caution : Throwing battery into fire or disassembly by force may cause explosion. Disposal
of used battery should be performed in accordance with the guideline of the pertinent
country or the work site.
Adapter for Recharge
Set Up of LPG/LNG gas
Hold 5 sec.
When adapter for recharge is equipped with the
device, battery recharge mode shall be displayed on
screen even under the mode of gas measure or
power Off state. Power shall be Off when adapter is
removed.
* Please be noted that this product is an optional
item that can be provided by the separate order.
Recharging End Recharge
When buzzer key is pressed under the state of power Off, type of gas presently set shall be
indicated. While buzzer key is pressed for 5 seconds, the set up for the type of gas shall be
changed to LNG from LPG. Set up for LPG can be made in same manner as that done for LNG.
12

Following tools and parts are necessary to replace sensor and battery of Sp Secure.
Tool : + Driver
Energizer No.E91, EN91 battery for replacement or rechargeable battery
Sensor for replacement
Sensor filter for replacement
Caution : No battery replacements or disassembly of product are permitted at potential
explosion or dangerous area.
- Please be noted that replacement of parts may cause damage to the fundamental safety
capabilities of the device..
- Sensors for replacement must be the one exclusively for SP Secure. The use of other
sensors may cause problems in the detection of gas leakage or cause errors in the
measurements.
- The device is to be disassembled only for the replacement of battery or sensor and it has to
be calibrated by utilizing standard gas during reassembly.
Replacement of Battery and Sensor
Method of Disassembly of Device
- Finish operation of the device.
- Replace sensor and battery referring to the picture
below.
- Operate the device after replacing sensor and then
adjust zero point and standardize the device.
- Conduct gas calibration (When battery only is
replaced, standard gas calibration shall not be
carried out)
9
1 2
3
4
5
8
6
1. Label(Membrane)
2. Front Cover
3. Upper cover
4. Sensor bracket
5. Sensor
6. Pump
7. PCB
8. Packing body
9. Rear Cover
10. Machine Screw
11. Battery
12. Battery Cover
11 12
710
13

Operation Flow Chart
14

Reading mode
15

Calibration mode
16

GAS mode change & warning level setting
17

18
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.