Model SG1
www.detcon.com
Portable Single Gas Detector
Operator’s Instruction Manual
Covers O2, CO, H2S, H2and SO2Models
DETCON, Inc.
3200 Research Forest Dr.,
The Woodlands, Texas 77387
Ph.281.367.4100 / Fax 281.298.2868
June 7, 2011• Document #3734 • Revision 0.0
Warranty and Repair
Detcon Inc. warrants the Model SG1 series to be free from defects in workmanship
of material under normal use and service for two years from the date of shipment.
Detcon will repair or replace the defected product during the warranty period at
no cost. However, Detcon is not responsible and will not repair or replace the
product at no cost under the following cases; the product has been purchased
through an unauthorized dealer, the product has been damaged or deformed
mechanically through user misuse, the product has not been properly calibrated or
has had parts inappropriately replaced in accordance with this operating manual.
In the event that any defect or issue with the product occurs during the warranty
period, Detcon will cover all expenses except for shipping fees. After the warranty
period expires, the expense of repair or replacement and shipping of the product
will be the responsibility of the customer. Detcon will not be responsible for any
indirect occurrence or accident and/or damage during the use of the product, and
the warranty shall be limited to the replacement of parts and product. The warranty
only applies to customers who purchased the product through Detcon and the
warranty repair is to be performed by the Detcon Service Department.
Product Information
Detcon Model SG1 is a portable single-gas detector that uses electrochemical sensor
technology to detect and monitor hydrogen sulfide, carbon monoxide, hydrogen, oxygen
and sulfur dioxide. This lightweight, compact gas detector is controlled by an advanced
microprocessor allowing for automatic zero-calibration and easy span calibration set up.
During normal operation the large backlit LCD screen continuously displays battery life
and real-time gas concentration in ppm or concentration of oxygen by percentage.
The SG1 features advanced STEL (Short Term Exposure Limit) and TWA (Time Weighted
Average) functions to prevent dangerous prolonged exposure to a specified gas.
Maximum and minimum gas concentrations can also be programmed and monitored. The
portable gas detector features an easy to use touch-button interface with simple-to-follow
display symbols. Users are alerted to hazardous conditions via three alarm functions:
vibration alert, LED alert lamp and an audible buzzer with low and high settings of up to
90 dB. Weighing just 4.6 ounces, the SG1 is housed in a sturdy rubber enclosure that is
shock resistant. It includes a heavy-duty stainless steel alligator belt clip and has a
minimum battery run time of 4,500 hours.
1
Table of Contents
Product Specification ------------------------------------------------3
Names and Functions of Exterior ------------------------------4
Start of Operation ----------------------------------------------------5
Operation Method ----------------------------------------------------6
Calibration --------------------------------------------------------------7
Method of Alarm Set-up and Display -----------------------9
Applicable Battery and External Pump---------------------12
Battery & Sensor Replacement --------------------------------13
Operational Flow Chart -------------------------------------------14
Notice for User and Parts List ---------------------------------15
2
3
Product Specification
Model SG1-O2 SG1-CO SG1-H2S SG1-H2 SG1-SO2
O
2
Measured Gas
0~30%
Measurement
Method
Principle of
Measurement
Electrochemical Type
Diffusion Type
Monitor Custom-made Digital LCD
Alarm 90dB
Alert Lamp Red LED
Vibration Alert Vibration Alarm
Power Source CR2
Applicable
Temperature &
-20 °C ~ + 50°C, : 10% ~ 95 % RH (no n-cond ensing )
Humidity
Explosion-Proof EEx ia IIC T4 / IP67
CO H2S H
0~500ppm
0~1,000ppm
0~100ppm
0~200ppm
2
0~20ppm
0~100ppm
SO
2
0~20ppm
0~100ppm
Case Rubber PC Case
Standard
Accessories
Optional
Accessories
Exterior
Belt Clip, Calibration Cap
Small-Sized Pump for Sampling
Dimension: 54mm(W) x 91mm(H) x 32 mm(D)
Weight: 120g (Including )
Specification of External Pump (Optional)
Power Source AA Size Alkaline Battery, 1 ea
Continuous
Operation Time
Applicable
Tempe rature &
Humidity
Exterior
Sampling Flux 0.5 liter / minute
Available to Operate for 5 hours or longer
-20°C ~ + 5 0°C, 0 to 9 5 % RH
Dimension: 34mm(W) x 270mm(H) x 47 mm(D)
Weight: 200g (Including )
Diagnosis Function Deadlock Alarm, Alert of Insufficient (Red LED Display)
4
Names and Functions of Exterior
1. Gas Sensor
2. Buzzer
3. LCD Display
4. Power Key
LCD display symbols
5. Backlight/Arrow Key
6. Alarm LED
7. Fastening Clip
8. Type Label
5
Start of Operation
Instrument Power-On
Press Power key for 2 seconds to turn power on. (Power will not be
turned on if the Power key is released before 2 seconds)
After power-up, a 10 second countdown will be displayed on the LCD
screen as the unit is being stabilized and the program enters Gas Detection Mode with alarm
sound and vibration.
When the unit stabilizes and enters Gas Detection Mode, it will display the icon and gas
reading. For normal operation, the icon will disappear after blinking 5 times and the
concentration of the gas detected at the moment will be indicated. In the event that stabilization
of the unit fails, it will not enter Gas Detection Mode and the icon will be displayed. In this
case, calibration of the sensor or service of the device is required.
Pass Fail
Instrument Power-Off
Press Power key for 3 seconds to turn power off. (Power will not be
turned off if the Power key is released before 3 seconds)
Caution: Appropriate calibration of the device is always required prior to operation at work
sites. Verify the unit’s detection response is functional and valid for the pertinent gas and
that the gas detection region is not blocked with foreign materials that could interfere with
gas detection.
LCD Back Light
In Gas Detection Mode, the concentration of gases being monitored
will be indicated on the LCD display. The LED backlight can be turned
on by pressing the green Arrow key which enables the operator to view
the measured value in dark locations. The backlight is turned off by
pressing the green Arrow key again. The backlight will automatically
turn off after 30 seconds.
Operation Method
Detection Mode
The unit enters Gas Detection Mode when the power is turned on.
Gas Detection Mode displays the concentration of the gas and
the remaining battery capacity on the LCD display. It displays
the gas concentration of Oxygen as a percentage (%) and toxic
gases such as H2S, CO and SO2in parts per million (ppm).
The unit displays the real-time concentration value and monitors any
gas concentration changes. If the value exceeds the 1st or 2nd Alarm setting, both the
displayed value and the corresponding alarm icon ( or ) will start blinking and audible
alarm alerts and vibration will be triggered. This also applies when the value exceeds the
STEL/TWA settings with their corresponding icons blinking.
If the operator moves to a safe place where the concentration value of the measured gas
is at normal levels, the concentration value will decrease and the alarm stops. (Even if the
operator escapes to a safe area after alarm activation, the icon of the alarm remains on
the screen and will disappear only after confirming the value by pressing the Power key.)
When the concentration value of the gas exceeds the maximum measuring range, it
will display the MAX icon and the LED, audible alert and vibration will be triggered.
Indication of Peak Value and TWA & STEL Value
For Oxygen, the measured maximum and minimum values are displayed in order by brief
presses of the Power button. For Toxic Gases, the maximum value, STEL value and TWA
value are also displayed in order by brief presses of the Power button.
Example) In the case of an Oxygen Detection Unit
Program returns to Gas Detection Mode when the Arrow key is pressed at any time while
displaying Peak, TWA or STEL. If the button is not touched for 10 seconds, the
program will automatically return to Gas Detection Mode.
Calibration
Calibration F
ail
10secs countdown
CalibrationS
uccess
Caution: Detcon Inc. performs the initial calibration prior to shipment. An incorrectly
calibrated value can reduce the accuracy of the product as the calibrated value is stored in
the unit. Calibration, in general, is to be performed monthly or quarterly, and can be
adjusted according to frequency of use.
Fresh Air Calibration
To enter Calibration Mode, press the Arrow key and Power key simultaneously for 3
seconds. CAL will be displayed and the icon will blink. Press the Power key to start
calibration. A 10 second countdown will be shown while the Fresh Air Calibration
occurs. If the calibration is successful, the icon will blink 3 times and the display will
return to Gas Detection Mode.
If the calibration fails, the icon will blink continuously. Re-calibrate and if the
calibration fails again, contact Detcon to replace the sensor.
Caution: Fresh Air Calibration should be performed in an environment of fresh air without any
Hold5 secs
Calibration
influence of other gases. The calibration is performed on the assumption that the concentration
of Oxygen is 20.9%, the 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 in
a closed space, and calibration should not be performed where hazardous gases can be
inhaled by operators.
Single Gas Calibration
To enter Calibration Mode, press the Arrow key and Power key simultaneously for 3 seconds.
CAL will be displayed and the icon will blink. Press the Arrow key again for Single Gas
Calibration. The icon will blink. Press the Power key for 5 seconds to start Single Gas
Calibration. Do not to proceed with calibration without connecting the single gas.
Success
60secscountdown Concentrationof Disconnect from
Single Gas Single Gas
Calibration
Fail
60secs count down
When Single Gas Calibration starts, a 60 second countdown will be shown while the
Single Gas Calibration occurs. If the calibration is successful, the concentration value of
the gas connected at the moment will be indicated and the icon will blink 3 times.
Afterwards, it will indicate the concentration value measured at the moment when the
Single Gas is disconnected. (Refer to the following table for correct gas concentration values)
If the calibration fails, the icon will blink continuously. Re-calibrate and if the calibration
fails again, contact Detcon to replace the sensor.
Gas Concentration Values for Calibration of Single Gas
Gas
Concentration
Oxygen
Carbon
Monoxide
0% 100ppm 50ppm 500ppm 10ppm
Hydrogen
Sulfide
Hydrogen
Sulfur
Dioxide
Method of Alarm Set-up and Display
Caution: The alarm values of the device are set according to the alarm standards of each
gas required by international standards. Therefore, alarm values of the relevant gas can
be changed under the responsibility and approval of the administrator of the work
site where the unit is to be used.
Alarm Display
Alarm Alarm Standard LCD Display
1stAlarm
2ndAlarm
In Exceeding Alarm Value
Set Primarily
In Exceeding Alarm Value
Set Secondarily
Displaying Icon &
Concentration
Displaying Icon &
Concentration
TWA
STEL
Dead
Test Failure
In Exceeding Exposure
Concentration for 8 hour
In Exceeding Exposure
Concentration for
15 minutes
Battery Capacity is
Exhausted.
Failure of Sensor Test
Failure of Calibration
Displaying TWA Icon &
Concentration
Displaying STEL Icon &
Concentration
Blinking of Battery
Displaying Icon
When the 1st alarm occurs, the operator can acknowledge it by pressing the Power key. Only
Hold3 secs
10
the alarm sound stops. The LED will stay on until the reading drops below the alarm value.
When the 2nd alarm occurs, the operator and workers should promptly leave the work site.
The operator can acknowledge the alarm by pressing the Power key in a place where the
concentration value of the gas is normal. (The alarm alerts continuously when it does not
return to a normal state even if the Power key is pressed.)
When STEL / TWA alarm occurs, it is indicated with the value of the measured
concentration and activates the alarm with the same sound and vibration as that of the
2nd alarm.
When STEL / TWA alarm occurs, their respective icons can be deleted only by Power Off.
Primary battery alarm sounds repeatedly at 5 minute intervals only when one bar of the battery
icon remains.
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 a test or calibration failure, the icon is displayed with an alarm sound.
Alarm Set Point
Gas O
1
st
2
nd
2
CO H2S H
2
SO
2
19% 30 ppm 10 ppm 100 ppm 2 ppm
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
To enter Alarm Set Mode, press the Arrow key for 3 seconds while the unit is powered off.
SET will be displayed and the icon will blink. Press the Power key to enter the alarm 1
value. Use the Arrow key to change the value and the Power key to move to the next
digit. Pressing the Power key while on the last digit will return to the alarm 1 SET screen.
While in the alarm 1 SET screen, press the Arrow key to select alarm 2. The icon will be
Hold3 secs
displayed and blink. Set alarm 2 using the same method for alarm 1. Pressing the Power
key while on the last digit will return to the alarm 1 SET screen.
10 secs count down
Press the Arrow key 2 times to save the selected values and exit the Alarm Set Mode. A
10 second countdown will initiate and at the end of the countdown, Gas Detection Mode
will be entered.
Method of Alarm Value Input
When setting the alarm values, the Arrow key is used to increase the value of the blinking
digit by one. Press the Power key to move to the next digit and use the Arrow key to change
its value if needed. Pressing the Power key while on the last digit will return to the alarm
1 SET screen.
Example) To change 1st Alarm Value from 19.5% to 19.0%
11
Applicable Battery
Caution: It is absolutely prohibited to replace battery in potential explosion areas or
dangerous regions. Specification of the applicable rechargeable battery or
disposable battery is indicated below.
- Disposable Alkaline Battery: 3V lithium CR2 battery
A battery with a different specification is not authorized to be used for this unit in
dangerous regions.
Warning: An explosion can occur when a battery is thrown into a fire or
disassembled with force. Appropriate disposal of the used battery should be
followed according to the guide of the pertinent country or the work site.
External Pump (Optional)
Features an On/Off Power key and the
operational or trouble state of the unit can
be recognized by its LED lamp.
An external pump can be used to measure the
leakage or the gas concentration by inhalation if
required. It is available to measure gas
concentration and leakage at the pertinent
place by connecting the pump to the unit.
Prior to use, make sure that the unit is
tightly attached to the probe cover which is
connected to the sensor.
Please note that the External Pump is an
optional product that can be provided by
ordering separately.
12
Battery & Sensor Replacement
8
9
1
234
7
5
6
When you replace the Battery and sensors of the SG1 unit,you need some tools and components
as indicated below.
- Tools: Phillips Screwdriver
- Battery : 3V lithium CR2 battery (Detcon P/N 360-BR0CR2-000)
- Sensors for replacement : Detcon 37P series (See Parts List)
- Filters for replacement
Warning : - It is absolutely prohibited to replace the battery in potential explosion
areas or dangerous regions.
- Replacement of components can damage intrinsic safety function.
- Only sensors provided by Detcon should be used for replacement. Improper
operation could result if unauthorized sensors are used for replacement.
- Disassembly is required only for sensor & battery replacement. After sensor
and/or battery replacement, span gas calibration must be performed.
Disassembly
- Turn off the power.
- Replace the sensor and/or battery, please refer to drawing below.
- After replacement, span gas calibration must be performed to verify
sensor does not fail and battery is operational.
1. Label(Membrane) 6. Battery
2. Calibration Cap 7. Rear Cover
3. Front Cover 8. Belt clip
4. Sensor 9. Machine Screws
5. PCB
13
Operational Flow Chart
14
Notice for User
Please use the unit in ranges of applicable temperature, humidity and pressure
that are appropriate for the specification of the product. Using the unit
beyond this range may cause a malfunction/glitch of the unit.
Gas concentration measurement values by the sensor or the unit can vary with
respect to the environment at the site (temperature, pressure and humidity).
Therefore, the calibration of the unit should be performed at the same or similar
environment as that of the unit use (temperature, pressure and humidity).
If temperature changes sharply during use of the unit (for instance, using the unit
where there are varying temperatures between indoor and outdoor), the value of
the measured gas concentration can change suddenly. Please allow time for
the gas concentration value to stabilize.
Severe vibration or shock to the unit may cause a sudden change in value of the
measured gas concentration. Please allow time for the gas concentration value to
stabilize. Excessive shock to the unit can lead to problems with the sensor or the
unit.
Parts List
Part Number Description Part Number Description
96P-240000-100
96P-240000-200
96P-440000-500
96P-440000-01K
96P-550000-020
96P-550000-100
96P-840000-500
Model SG1-H2S,
Range 0-100ppm
Model SG1-H2S,
Range 0-200ppm
Model SG1-CO,
Range 0-500ppm
Model SG1-CO,
Range 0-1,000ppm
Model SG1-SO2,
Range 0-20ppm
Model SG1-SO2,
Range 0-100ppm
Model SG1-H2,
Range 0-500ppm
96P-840000-01K
96P-340000-030
37P-240000-000 H2S Plug-In Sensor
37P-440000-000 CO Plug-In Sensor
37P-550000-000 SO2 P lug-In Sensor
37P-840000-000 H2 Plug-In Sensor
37P-340000-000 O2 Plug-In Sensor
15
Model SG1-H2,
Range 0-1,000ppm
Model SG1-O2,
Range 0-30%
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