SENKO SP12C7 User manual

MODEL: SP12C7
(Portable 4 gas detector)
Operating Manual

Product Introduction
SP2nd is Simple Gas Alarm Detector that is required to protect users’ safety at
dangerous work environments. 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.
01

02
Contents of Operating Manual
Product Specification ----------------------------------- 03
Names of Exterior and Display --------------------- 04
Start and End of Operation --------------------------- 05
Operation Method ----------------------------------- 06
Backlight ----------------------------------------------- 07
Start and End of Sensor ------------------------------- 08
Calibration ------------------------------------------------- 08
Method of Alarm Set and Display ----------------- 10
Battery & Sensor replacement --------------------- 13
Applicable Battery and External Pump ---------- 14
Notice for User --------------------------------------- 16

1. Product Specification(SP12C7)
03
MODEL SP12C7
Detecting Gas O2 CO H2S EX
Detecting Range 0~30%Vol 0~500ppm 0~100ppm 0~100%LEL
Sensor Type Electrochemical Electrochemical Electrochemical Catalytic
Sampling Method
Diffusion
Display Digital LCD
Audible Alarm 90dB
Visual Alarm Red LED
Vibrator Alarm Vibration Alarm
Power Alkaline battery 2EA, Rechargeable NI-MH battery pack
Applicable
Temperature &
Humidity -20℃ ~ +50℃, : 10% ~ 95% RH (non-condensing)
Explosion proof EEx ia IIC T4 / IP67
Case Clear polycarbonate with thermal-plasticelastic (TPE) overmold.
Standard
Accessories Belt Clip, Charger
Option Sampling pump(SP-Pump101)
Dimensions 54mm(W) x 135mm(H) x36.5 mm(D)
Weight 240g

1. Gas sensor
2. Buzzer
3. LCD display
4. On/Off Key
5. Key
6. Alarm LED
7. Fastening clip
8. Type label
9. Charging contacts
10. Battery pack
1
2
3
4
5
6
7
8
9
10
04
LCD display symbols
2. Names and Functions of Exterior

05
Press Arrow key for 3 seconds at the state of pushing Power Key simultaneously,
and power is turned off displaying 3, 2, and 1 in order on the monitor with turning
on LED Lamp and alarm.
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, it displays
consecutively A1 & A2 set values of LEL Gas, A1 & A2 set values of O2 Gas, A1 set
value of CO Gas, A2 set value of CO Gas, set values of STEL & TWA, A1 set value of
H2S Gas, A2 set value of H2S Gas, and set values of STEL & TWA on the monitor.
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 30 seconds, and the concentration of the gas detected of
the moment is indicated.
V
V
In the event that stabilization of the instrument fails, it would
not convert to Gas Detection Mode, blinking the mark with
alarm sound. In this case, calibration of the sensor or aftercare
of the instrument is required.
OFF
+
OFF …
3. Start and End of Operation
Instrument Power-On
<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.
Instrument Power-Off

06
At Gas Measure Mode, Peak value is displayed (Peak values of all 4 sensors) by
pressing Arrow key for 3 seconds, the value of TWA (only for CO and H2S) is
shown by pressing it again, and that of STEL (only for CO and H2S) is indicated
consecutively by pressing it once more. The program returns to Gas Measure Mode
by pressing Power key at the state indicating Peak, TWA and STEL. And it reverts
automatically to Gas Measure Mode as well without using the button for 30
seconds at the state of Peak, TWA and STEL.
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 %,
Inflammable Gas by %LEL, H2S and CO Gas by ppm units. In the
event that the concentration of the specific gas changes, it indica
-tes the value of concentration in real-time. If it exceeds A1 or A2 Alarm standard
(or STEL / TWA), the measured value and A1 or A2 (icon in case of STEL / TWA) is
displayed at one second interval in turn alerting by alarm sound and vibration.
As of A1, the instrument program will be converted to the original condition and
starts the operation, when the concentration value of the measured gas returns to
the normal state. (LED and LCD Backlight are displayed continuously and the alarm
sound stops, if power key is pressed during the alarm sounds. During the alarm
sound, the measured value and A1 or A2 are displayed in turn on LCD.) In case of
A2, power should be disconnected in order to stop the alarm. 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 A2 Alarm Standard operate together
4. Operation Method
Detection Mode
Indication of Peak Value and TWA & STEL Value
Password Mode
Password input screen appears by pressing Power key for 5 seconds. Number
changes from far left to the right side. It moves upward by each 1 step and blinks
by pressing Arrow key, and the blinking 2nd number moves the position by
pressing Power key. If key.

07
<Caution> The initial password is set as 000. It is impossible to enter Calibration
or Alarm Set Mode, if the operator can’t remember the new password after
changing it.Please be sure not to forget the password.
Password Change Mode
When password icon blinks by moving as the above drawings, press Power key.
Then the existing password is displayed blinking from the first digit. If the new
password is entered, the existing password is deleted and the new password
appears. When the same password is put repeatedly at RE, the password will be
changed and the program will return Password Change Mode where icon is
blinking. If further change of password is not required, return to Gas Measure
Mode by using Arrow key.
If you press Arrow key, the number moves upward, and the 3rd number blinks
and moves the position by pressing Power key.
After completing the change of the last number and enter the Power key, icon
blinks with 0.5 second alarm sound if the password is correct. As previously
explained, the program moves to Calibration Mode by pressing Move key, and
moves to Alarm Set Mode by Power key.
If the password is incorrect, it returns to Gas Measure Mode altering the alarm
sound.

08
LCD Backlight
At the state of Gas Detection Mode
indicating the concentration of 4 kinds of
gases simultaneously, LED Backlight is
turned on by the short press on Arrow key,
and it is turned off by pressing again once
more. It enables the operator to view the
measured value even at dark atmosphere.
Backlight will be automatically turned off
after 10 seconds unless the button works.
5. LCD Backlight
Individual Sensor On/Off
6. Start and End of Sensor
<주의>cLr Mode is factory reset mode. Factory reset mode prohibits user except
factory from using of cLr Mode. Please pay attention to it.
** If press Key, repeat as follows.
on -> oFF -> cLr(Factory reset)
Press Power key for 5 seconds, After completing passwore and enter the Power key,
letter ‘on’ blinks icon together. At this time, if press Power key, position move
to next sensor and start/end of sensor selects by pressing Arrow key
Save value
Select number
Save set
Change sensor set

09
Press Power key for 5 seconds and input password, sensor on/off, and icon will
blink. Then press Arrow key to make icon blink. When Power key is pressed at
the state, it converts to Calibration mode of the standby state.
Calibration will be processed, when Power key is pressed after entering to
Calibration mode of the standby state. Calibration will be completed by 3 time
blinking of 4 sorts of gas concentrations, and the mark OK is displayed.
7. Calibration
Fresh air Calibration
<Caution> Senko Co., Ltd. performs the initial calibration before the shipment.
Incorrectly calibrated value can reduce the accuracy of the product, as the calibrate
d 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.
In the event that calibration fails, it would not convert to Gas
Detection Mode, blinking the mark with alarm sound. In this
case, calibration of the sensor or aftercare of the instrument is
required.
.
Standard Gas Calibration
Press Power key for 5 seconds and input password, sensor on/off, then icon
will blink. And press Arrow key to see icon blink. The icon will blink, when
the operator presses again Arrow key once more. Then it enters to Standard Gas
Calibration Mode of, as Power key is pressed.
When Standard Gas Calibration start, calibration gas concentration appears at
device and calibration starts by setting gas concentration. Press Power key at last
number of 4th sensor, calibration starts automatically.

10
<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.
Save value
Change value
…Start
calibration
If Standard Gas Calibration starts, screen of detector is displayed sequentially
according to gas kind. That is, calibration proceeds for 60 seconds as information
for 4 sensor appears once 1 second. If you want to cancel calibration, press arrow
key. Then press Power key, returns in Standard Gas Calibration entry ago.
Concentration of Standard Gas Calibration is saved by state that change only in
case calibration completes without problems.
If calibration is ended without problems, writing 'OK' is appeared, and returns by
Gas Measure Mode if press this after power key.
Value
60 second
Count down
ADC값
Gas Value
60 second
Count down
ADC값
Gas
…

11
Concentration of Calibration Gas set at Instrument
When Lock icon blinks after entering password, approach to A1 Alarm Value Set
Select Mode by pressing Power key. If Arrow key is pressed during blinking of
icon, the program moves to Calibration Select Mode likely Sensor Calibration
Mode. Please pay attention to this point.
In the event that calibration fails, it would not convert to Gas
Detection Mode, blinking the mark with alarm sound. In this
case, calibration of the sensor or aftercare of the instrument is
required.
Gas Combustible Oxygen Carbon
monoxide
Hydrogen
Sulfide
Concentration 50%LEL(CH4
) 18%vol 100 ppm 25 ppm
9. Method of Alarm Set and Display
Alarm Set
<Caution> Changing alarm value of TWA and STEL can be applied only to Carbon
Monoxide and Hydrogen Sulfide. The change of alarm standard of TWA and STEL
can cause the fatal influence to the lives of operators and workers; therefore it
must be set in accordance with the regulations of the relevant country and the
standard of exposure at work site, if it is inevitably changed.

12
A1 icon blinks, when Power key is pressed at Lock Blink Mode. It will be
converted to A1 Alarm Mode by pressing Power key, and the blinking icon will be
alternated in the sequence of A2, TWL, STEL and Password. If you want to approach
to each Alarm Value Set Mode, enter it by pressing Power key.
A1 icon blinks by pressing Power key at Lock Blink Mode. And it is converted
to %LEL Alarm Value Set Mode by pressing Power key again. After moving to %LEL
Alarm Value Set Mode, Alarm Value of %LEL, that has been input initially, blinks.
And the Alarm Value can be changed by the same method as password input.
Changing sequence of Alarm Value is %LEL, %vol, Oxygen, Carbon Monoxide and
Hydrogen Sulfide, and it returns to A1 Set Mode when the change of Alarm Value
of each gas is completed.
Alarm Set of Each Gas
…
Save value
Change value
Alarm Display
When A1 alarm occurs, and the operator recognizes it and presses Power key,
only the sound and vibration of alarm stop, remaining LED alarm as the operation
stale. When A2 alarm happens, the operator and workers should promptly escape
from the work site. The alarm will stop, when power is turned off at the place
where the concentration value of gas is normal after moving to a safe region. (If
the instrument is operated again at an abnormal environment, the warning of test
failure is displayed.)
<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(A1) In Exceeding Alarm
Value Set Primarily
Displaying Icon A1
& Concentration
2nd Alarm(A2) In Exceeding Alarm
Value Set
Secondarily
Displaying Icon A2
& 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
Low Battery Remained Battery
Capacity is small
(one bar)
Blinking of
Test Failure
Failure of Sensor Test
Failure of Calibration
Displaying
Icon
Test Failure
13
<Note> In case of Inflammable Gas, it is determined by Alarm Set Mode to
display %LEL or %VOL. When %LEL Alarm Value is changed, %LEL is displayed at
Calibration Mode. In the event that %VOL Alarm Value is changed, %VOL is
indicated at Calibration Mode. If you don’t want the display by %VOL, move to the
next step without changing the value at %VOL Alarm Value Change Mode.
Alarm Display
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 A2 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 of Test Failure is displayed
with the sound of alarm.
Buzzer
LED, LCD Backlight
Buzzer, LED

14
Alarm Set Point
Gas Combustible Oxygen Carbon
monoxide
Hydrogen
Sulfide
A1 20 %LEL 19% 30 ppm 10 ppm
A2 40 %LEL 23% 60 ppm 20 ppm
TWA - - 30 ppm 10 ppm
STEL - - 200 ppm 15 ppm
9. Battery & Sensor replacement
When you replace the Battery and sensors of SP12C7, you need some instrument
and components as below.
- Instrument : + driver, wrench(hexagon)
- Battery : Energizer No.E91, EN91 or GP rechargeable Battery GP210AAHCB
- Sensors for replacement
- Filters for replacement
Disassembly
1
1
2 3 4 5 6
6
6
7 6
8
9
1. Label(Membrane)
2. Front Cover
3. Sensor
4. PCB
5. Rear Cover
6. Machine Screw
7. Belt clip
8. Bolt(hexagon)
9. Battery
- Turn off the power.
-Replace the sensor and battery , please refer to below drawing.
-After replacement, check the sensor fail and battery working.

15
<Caution> It is absolutely prohibited to replace battery at potential explosion
areas or dangerous regions. And the charger should be always used at the safe
place, since it is not an explosion-proof product.
When the unit is connected to battery charger, power source
should be turned off without fail before charging. The state of
charging is indicated on LED display of the charger..
**Red LED: charging / Green LED: completion of charging
Charging time of rechargeable battery is 5 hours, and it can be
used for 12 hours at the state of general measuring.
10. Applicable Battery and External Pump
Specification of the applicable rechargeable battery and disposable battery is as
below:
- Disposable Alkaline Battery: Energizer No. E91, Energizer No.EN91
- Rechargeable Ni-H Battery: GP BATTERY GP210AAHCB
It is not permitted to use other batteries for the instrument at dangerous regions.
<Caution>
1. It is absolutely prohibited to replace battery at potential explosion or dangerous
regions.
2. Replacement of components can be damage to intrinsic safety function.
3. The sensors published by SENKO should be used for replacement. Unsuitable
function could be shown if another sensors use for replacement.
4. Disassembly should be necessary only for sensors & battery replacement. After
the sensor replacement, the span gas calibration should be done.
<주의>Followings may cause the danger of explosion; to use the old battery and
the new one together, to use different manufacturer’s battery; or to use the
batteries of different specification. In order to avoid an accident, please use only
the applicable batteries as specified above. 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.

16
Accessory(Optional) - External Pump (SP-Pump101)s
Product specification(SP-Pump101)
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 concen-
tration 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.
Power Source AA Size Alkaline Battery(1 EA)
Continuous Operation Time Available to Operate for 10 hours or longer
Applicable Temperature &
Humidity -20°C ~ +50°C / 5 ~ 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)

Operation Flow Chart
17

18
Operation Flow Chart
Calibration & Configuration Flow

19
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. .
12. 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.