This product is an oxygen
detector that complies with
JIS T 8201:2010

Digital Oxygen Indicator XO-326IIsA XO-326IIsB XO-326IIsC

This instruction manual is for the three models listed to the left.
• Keep this manual for easy reference.
• Carefully read this manual prior to use.

Instruction Manual

Document No.: XO-326IITTable of Contents
Package Contents ................................................................................................. 1
1. Introduction ....................................................................................................... 2
Explosion-proof Requirements (Japan) ............................................................. 2
Symbols Used in this Manual ............................................................................ 3
Safety Precautions ............................................................................................ 3
2. Unit and Components ....................................................................................... 5
XO-326IIs .......................................................................................................... 5
Leather Case .................................................................................................... 7
3. Operating Procedure ......................................................................................... 8
4. Error Codes ...................................................................................................... 11
5. Consumable Replacement .............................................................................. 125.1. Filter Element Replacement ..................................................................... 125.2. Battery Replacement................................................................................ 13
5.3. Sensor Replacement ............................................................................... 14
6. Maintenance.................................................................................................... 16
6.1. Routine Check ......................................................................................... 16
6.2. Annual Inspection ..................................................................................... 16
6.3. Consumable Parts ................................................................................... 16
7. Troubleshooting ............................................................................................... 17
8. Warranty .......................................................................................................... 18
9. Specifications .................................................................................................. 19
10. Detection Principle ........................................................................................ 20
11. Glossary ........................................................................................................ 21

Package Contents
A standard package consists of the following items. If any items are missing or
damaged, please contact New Cosmos or its authorized representative forreplacement.
Item

Quantity

Digital oxygen indicatorwith leather case1

Shoulder strap

1

Replacement filter element (FE-2)
2 pcs/set

1 set

Panasonic alkaline AA battery (LR6X)

2

Instruction manual (this document)

1

Optional Items (sold separately)
Item

Description

5m extension cable (LC-3-5)
with storage case

Used to extend the length ofthe cable- 1 -1. Introduction
Thank you for purchasing the New Cosmos XO-326IIs series digital oxygen indicator(product, detector, or unit). Prior to use, please read this instruction manual carefully toensure safe and reliable operation.
This product measures the concentration of oxygen while working in pits, manholes,
wastewater treatment tanks, basement, tanks, etc. If the gas concentration drops to apreset level, the unit issues visual and audible alarms by means of beeping sounds and a
red blinking light to prevent accidents due to low oxygen levels.
Carefully read this manual, regardless of your experience with gas detectors. Do not use
this product for any purposes other than those intended or described in this manual.

Explosion-proof Requirements (Japan)
Follow the conditions below to comply with the explosion-proof requirements.
Exploson-proof:
Power Source:
Batteries to use:

Ex ia IIC T3 Ga
3.0 VDC alkaline AA battey x 2 pcs
Toshiba alkaline AA battery LR6 x 2 pcs,
Panasonic alkaline AA battery LR6X x 2 pcs, orDuracell alkaline AA battery MN1500 x 2 pcs

Ambient temperature: -20ºC to +50ºC
Conditions of Use▪ This product should not be used in a hazardous area outside of Japan.
▪ Do not replace the batteries/sensor/filter element in a hazardous area.
▪ Only use the product while installed in its dedicated leather case.
▪ To prevent accidents from electrostatic charges, wear anti-static clothing andconductive footwear (anti-static work shoes), and maintain a conductive work
floor (resistance: 10M Ohm or less).
▪ Do not use this product for measuring the oxygen concentration in any
mixture other than a mixture of air and combustible gas or a mixture of vapor
and toxic gas.
▪ Only use specified batteries.

- 2 -Symbols Used in this ManualThis manual uses DANGER, WARNING, CAUTION and NOTE symbols to draw
attention to procedures, materials, methods, and processes, which require particularattention.
DANGER

Indicates an imminently hazardous situation that can result indeath or serious injury

WARNING

Indicates a potentially hazardous situation that may result in deathor serious injury

CAUTION

Indicates a hazardous situation that may result in minor injury orproperty damage

NOTE

Provides advice/information on product handling

Safety Precautions• Use this product in accordance with the applicable laws and regulations.
• To ensure safe operation, follow the precautions below.
DANGER▪ When a gas alarm activates, immediately take all the measuresnecessary to prevent an explosion.

WARNING ▪ Air adjustment (zeroing) starts automatically when the detector isturned on. Turn on the detector in clean air. Failure to do so may
cause incorrect air adjustment, which will then lead to inaccurate
measurements being displayed.
▪ Do not block the gas detection port. If blocked, correct detection
is not possible.
▪ Keep the filter element at the gas detection port clean and dry. If
the filter element is dirty or wet, proper gas detection is notpossible.
▪ Do not block the audio opening. If blocked, the audible alarm will
be muffled.
▪ The recommended sensor replacement cycle is one year. The
sensor may fail to provide accurate detection after one year;
therefore, it should be replaced.

- 3 -CAUTION ▪ If this product is to be unused or stored for an extended period oftime, the batteries must be removed. Leaving them inside while
the product is unused or stored for an extended period of time
will drain them and cause them to leak, which will lead to productfailure.
▪ Check the battery level periodically (approximately once amonth) even if the product remains unused for an extended
period of time. Replace the batteries, as leakage of the electrode
may occur when the battery level is low.
▪ This product is explosion-proof. Do not disassemble, modify, or
alter the structure of this unit or its electrical circuits. Doing so
may impair the performance of the explosion-proof
characteristics.
▪ This product is not drip-proof. Keep away from water.
▪ Avoid using the product outside the specified operating
temperature/humidity range. Also avoid exposing the product toabrupt temperature/humidity changes. Failure to do so may
impair the performance of the product.
▪ Avoid rapid changes in pressure. Failure to do so may impair thesensor performance or damage the sensor.
▪ Avoid strong mechanical shock, impact or vibration to the
product by dropping or bumping. Failure to do so may impair the
performance of the product.
▪ If condensation is present on the product, remove it and makesure the unit is completely dry and has been checked forabnormalities before use.
▪ Only use the specified batteries. The use of any unspecified
battery may impair the product’s explosion-proof performance.
▪ The oxygen sensor has pressure dependence. Therefore, makenecessary pressure adjustments when using the product at aplace other than at sea-level, such as at high altitudes.（Page 20）▪ Prevent the oxygen sensor being submerged in water whenusing it in a manhole, etc. A submerged sensor cannot provide
gas detection.
▪ The gas sensor contains harmful substances. For disposal,
return the used sensor to New Cosmos or treat as industrial
waste.
▪ Due to the battery’s characteristics, the battery life will be shorter
when used at low temperatures than when used at room
temperature.
▪ Keep the product away from wireless devices while in use.
Failure to do so may cause fluctuations in the reading or a fault
alarm due to radio wave interference.

- 4 -2. Unit and Components
XO-326IIs
6
8

1
11
2

10
3

5

4

12

XO-326IIsA

6

7

9

XO-326IIsB

XO-326IIsC
- 5 -

Item
Component
1
POWER button
2

AIR ADJ button
LCD

(a)

Function
Press to turn the unit on/off
Press and hold to perform air adjustment(21.0% adjustment)
Displays gas concentration, battery level,
error code, etc.
(a) Battery level
High ⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅ Low Replace

3
(b)

(c)

4

Gas detection port(b) Gas concentration and error code(c) Unit of measurement
Gas inlet to the sensor

5

Sensor unit

Houses an oxygen sensor

6

Spool

Spool for winding and storing the cable7

1 m cable (curl cord type)

Extension cable (for XO-326IIsB)

8

5 m cable

Extension cable (for XO-326IIsA)

9

10 m cable

Extension cable (for XO-326IIsC)

10

Alarm LED

Blinks red when a gas alarm is detected

11

Audio opening

Opening for audio

12

Battery cover

Open/close for battery replacement- 6 -Leather Case

2

1

For XO-326IIsA

3For XO-326IIsB

Item

Component

Function

1

Shoulder strap bracket

Attaches the shoulder strap

2

Sensor pocket

Stores a sensor unit

3Side pocket

Stores a quick start guide- 7 -For XO-326IIsC

3. Operating Procedure
Perform a routine check prior to use (page 16).

WARNING

STEPS

1. Battery

installation

2. Power on

Gas concentration
screen3. Detection

4. Power off

1. Battery installation
Units are shipped without batteries. Remove the battery cover and then install thetwo supplied batteries. See “Battery Replacement” on pages 13 and 14 for theprocedure.

2. Power on
WARNING

Air adjustment starts automatically when the product is turned
on. Ensure that the air adjustment is done in clean air. If the air
adjustment is done in a gas atmosphere, inaccurate gas
concentration will be indicated.

Press and hold the POWER button for 3 seconds. A countdown will start with“on.3”, “on.2” and “on.1” being displayed in sequence. Next, the <1st stage gas
alarm set value> and <2nd stage gas alarm set value> screens will be displayed insequence, followed by air adjustment. When the air adjustment is completed, the<gas concentration> screen will be displayed. The power-on process will becompleted within 10 seconds.
Countdown

NOTE

The LCD backlight will automatically turn on when the POWER or AIR ADJ
button is pressed, which will automatically turn off 5 seconds later.

Gas alarm set values
The unit displays the 1st stage gas alarm set value and then 2nd stage gas alarm
set value.

1st stage gas alarm set value

2nd stage gas alarm set value- 8 -Air adjustment (21% adjustment)
When the blinking gas concentration value (sensor life indicator) changes to“21.0%”, it means that air adjustment is complete and the unit is ready for
detection.

Sensor life indicator

Air adjustment is complete

Check that “23.0%” (sensor life indicator) blinks during air adjustment. As
the sensor gets closer to the end of its life, the value will become smaller.
Replace the sensor with a new one before it reaches “21.0%”.
(“Consumable Parts” on page 16.)NOTE

3. Detection
WARNINGCAUTION

NOTE▪ Do not cover the gas detection port with any fabric, mud,water, etc. If blocked, correct detection is not possible.
▪ Keep the filter element at the gas detection port clean anddry. If the filter element is dirty or wet, proper gas detection
is not possible.
▪ Avoid strong mechanical shock, impact, or vibration to the
product by dropping or bumping. Failure to do so may
impair the performance of the product.
▪ Do not block the audio opening. If blocked, the audible
alarm will be muffled.
▪ A significant change in work environment (e.g., temperatureor humidity change) may cause a zero drift (deviation from
21.0vol% point). In this case, press and hold the AIR ADJ
button to perform air adjustment in clean air.

▪ When winding/unwinding the cable around/from the spool, be careful not
to twist or damage it.
▪ If 1st and 2nd stage gas alarms simultaneously activate, the 2nd stage gas
alarm will be prioritized over the 1st stage gas alarm.
▪ When the gas concentration exceeds the service range, the upper limit of
the service range and "OL" (over range) will be displayed alternately.

- 9 -1st stage and 2nd stage gas alarm operation
When the gas concentration exceeds the 1st or 2nd stage gas alarm set value, theunit will start beeping, and the gas concentration value and alarm LED will blink.

1st stage gas alarm

NOTE

2nd stage gas alarm▪ The unit beeps faster and the alarm LED blinks faster during the 2nd stage
gas alarm than they do during the 1st stage gas alarm.
▪ The LCD backlight lights up while a gas alarm is active.

4. Power off
Press and hold the POWER button for 3 seconds.
“oFF” will be displayed and then the unit will turn off with one beep and one blink of
the alarm LED.
CAUTION

Do not remove the batteries immediately after the unit is turned
off. Wait for more than 3 seconds after turning the unit off, thenremove the batteries from the unit. Data writing automaticallystarts when the unit is turned off. If the batteries are removed
while data writing, the data may become corrupted, which willthen require a repair.

- 10 -

4. Error Codes
If an abnormality occurs in the unit, the corresponding error code will be displayed on the
LCD, the unit will start beeping, and the alarm LED will start blinking red. The table below
lists major error codes. If an error occurs, take necessary actions according to thedisplayed error code.
When no error code is displayed, but the button or display does not function, remove thebatteries, put them back, and turn on the unit. If the unit does not reset to normal, contact
New Cosmos or your New Cosmos representative for repair.
Error
Condition

Error Code

Cause and Action
Incomplete air adjustment or sensor
error.

Air
adjustment
error

Press and hold the AIR ADJ button inclean air to perform air adjustment. If
the error code is still present after
performing the air adjustment a few
times, contact us for repair.
Battery is drained.

Battery
depleted

Replace the batteries with new ones.
(“Battery Replacement” on page 13)
Device internal error.
Turn off the unit. After more than 3
seconds, remove the batteries, putthem back, and turn on the unit. If theunit does not reset to normal after that,
contact us for repair.

Deviceerror- 11 -

5. Consumable Replacement
5.1. Filter Element Replacement
Replace the filter element with a new one if it is dirty or wet.
CAUTION

NOTE▪ Ensure that the filter element is aligned and installed correctly.
Misalignment may compromise gas detection and waterproof
performance.
▪ Ensure that the sensor cap is installed securely. A loose sensor
cap may cause water ingress into the unit, resulting in device
failure.
▪ Call for repair if water is observed inside the unit. Proper gas
detection is not possible if water is present inside.

▪ Do not push or poke the filter element with a finger or any such object.
Deformation or breakage of the filter element may compromise its waterproof
or dustproof function.

1) Rotate the sensor cap counterclockwise to remove.

Oxygen sensor

Sensor caseSensor cap

GasketFilter element

2) Remove the gasket (O-ring).

3) Replace the filter element (FE-2) with a new one.
4) Install the gasket.
5) Rotate the sensor cap clockwise to install.

- 12 -

5.2. Battery Replacement
WARNINGCAUTION▪ Do not replace the batteries in a hazardous area.
▪ Only use specified batteries (Toshiba alkaline AA battery LR6,
Panasonic alkaline AA battery LR6X, or Duracell alkaline AAbattery MN1500). The use of unspecified batteries may impair
the product’s explosion-proof performance.
▪ Do not replace the batteries while the unit is on.
▪ Data writing will start immediately after the unit is turned off.
Removing power during data writing may cause data
corruption, which will require a repair. After turning off the unit,
wait for more than 3 seconds before starting battery
replacement.

As the battery decreases, the battery icon will change as shown in the figure below(indicator blocks vanish one by one). Before the unit becomes unusable, the last block
will start blinking, and the unit will start chirping at 10-second intervals (pre-alarm).
When the battery is depleted, the error code “E-b” will be displayed on the LCD, theunit will beep, and will not detect gas any longer. Beeping stops when the unit isturned off.
Pre-alarm

Power off

NOTE

▪ Only use new batteries of the same type for replacement.
▪ Replace both batteries at the same time.

1) Remove the sensor unit from thesensor pocket, and then remove theoxygen indicator from the leather case.

Leather caseSensor pocket

2) Press the “OPEN” marking on thebattery cover and slide down to open it.

- 13 -

Battery cover3) Pull the red ribbon to remove the batteries from the battery compartment.
Shift the red ribbon to the right and pull it
to remove the batteries.

NOTE

Red ribbon

WARNING

Install the batteries in the correct orientation. Incorrectorientation may cause them to leak or discharge, leading todevice failure or shorter operating time.

4) Match the battery polarity to the marking inside the compartment and insert two
new batteries so that the red ribbon is under them.
5) Slide up the battery cover into place and close it.
6) Place the oxygen indicator into the leather case. Place the sensor unit into sensor
pocket.

5.3. Sensor Replacement
CAUTION▪ Ensure that the sensor is installed correctly. Incorrect
installation may impair the product performance.
▪ Only hold the sensor case when rotating the sensor cap. Failure
to do so (e.g., to hold the clamp cover) may damage the sensor
case.

1) While holding the sensor case with your fingers, rotate the sensor cap
counterclockwise to remove it.
Clamp cover

Oxygen sensor

Sensor case

Oxygen sensor

Sensor cap

2) Pinch the head of the sensor and slowly pull to remove the sensor from the case.
Oxygen sensor

Pull- 14 -

3) Install a new oxygen sensor into the sensor base as follows:
Align the sensor’s connector pins (2 places) into their corresponding holes on thesensor base. Push the sensor top until the sensor bottom makes contact with thesensor base. (The oxygen sensor uses asymmetrical arrangement of its
connector pins to prevent incorrect mating.)
WARNING

When installing an oxygen sensor, ensure that the sensor’s
connector pins are vertically inserted into the socket. Tilted
insertion may damage the socket.
Vertically pushSensor base (socket)
Good 纝
푸

Locate the correct pin’s’ location (2 places)

CAUTION

Not good (sensor is misaligned)

Install the oxygen sensor correctly. When the locations of
the connector pins are reversed, the sensor cap cannot be
installed correctly. Forced installation of the sensor cap
may break the pins. If the pins are reversely connected,
reinstall the sensor by switching the pin locations.

4) Rotate the sensor cap clockwise to install into the sensor case.
GasketFilter element
Rotate the sensor cap

CAUTION▪ Just after the sensor installation, the sensor output is notstable. Allow the sensor to stabilize for more than 30
minutes after installation.
▪ If the filter element and gasket come off the sensor cap,
reinstall them as per “Filter Element Replacement” on page12.

- 15 -

6. MaintenanceThis product is a precision instrument. Please perform the periodical checks andinspections below to maintain the product’s optimal performance and ensure safety. In
the event of a failure to follow the safety precautions (pages 3 and 4)—such as impact
shock from dropping or water ingress inside the product—or use in conditions outside thespecifications (page 19), such as usage in temperature/humidity exceeding the specified
range, please contact New Cosmos or your New Cosmos representative for inspection(fees may apply). A comprehensive description of the current situation would beappreciated when you contact us.
• The recommended replacement cycle for oxygen sensors is one

WARNING

year from the date of purchase. Replace the sensor with a newone annually.
• For information on the oxygen sensor, read the instructions
provided with the sensor package.

6.1. Routine Check
Check Item

Description

Alarm function

Prepare a test gas that slightly exceeds the alarm set value. Let
the detector sample the test gas and check for alarm operation.
Check whether the reading changes. Check whether the alarm
LED blinks red and audio alarm begins when the reading
reaches the alarm set value. If the reading does not change
properly, the alarm LED does not blink, or the audio alarm does
not sound, contact New Cosmos or your New Cosmos
representative for repair.

Filter element

Check that the filter element inside the sensor head is clean
and dry. Replace it with a new one if it is dirty or wet (page 12).

Battery level

Check the battery level indicator at the top-right corner of the
LCD. If the battery level is low, replace the batteries with newones (pages 13 and 14).

6.2. Annual Inspection
Contact New Cosmos or your New Cosmos representative to perform a periodic
inspection at least once a year to maintain product accuracy.

6.3. Consumable Parts
Part Name

Model

Remarks

Replacement filter element (10 pcs)

FE-2-10For XO-326II

Replacement oxygen sensor

OS-3M-L

For XO-326II* The warranty period for consumable parts is one year from the date of purchase. The
warranty terms and conditions are the same as the ones for the gas detector.
- 16 -

7. Troubleshooting
Before contacting us for service repair, perform basic troubleshooting using the tablebelow. If the product locks up, turn off the unit. After more than 3 seconds, remove allbatteries. After a few minutes, put the batteries back in and turn on the product.
CAUTION

Do not remove the batteries immediately after the unit is turned off.
Wait for more than 3 seconds after turning the unit off, then remove
the batteries from the unit. Data writing automatically starts when theunit is turned off. If the batteries are removed while data writing, thedata may become corrupted, which will then require a repair.

Symptom

Cause

ActionPressing thepower button does
not turn on the
powerBattery orientation
incorrect

Remove batteries
and reinsert themin the correctorientation

Battery depleted

Replace batteries

Error code
appears

See “Error Codes” on page 11- 17 -

Reference“BatteryReplacement” onpages 13 and 14

8. Warranty
The warranty period is one (1) year from the date of purchase.
You are entitled to the limited warranty, if the product malfunctions due to a
manufacturing defect during normal use in accordance with the instruction manual,specifications and labels.
Warranty Scope
If the product fails or is found to be damaged due to a manufacturing defect during thewarranty period, and used in accordance with the instruction manual and specifications,
we will provide a free replacement and repair service. This warranty covers the New
Cosmos product/parts only and not third party product/parts.
Warranty Exclusions
The following will be repaired at the cost of customer even during the warranty period.
(1) Failures and damages incurred by incorrect use, deliberate acts or negligence of theuser.
(2) Failures and damages caused by disaster, earthquake, storm and flood, lightning,
extreme climate, abnormal power supply voltage, excessive electromagnetic
interferences, or other acts of God.
(3) Failures and damages resulting from repair and/or modification by non-New
Cosmos certified technicians.
(4) Consumables and failures and damages resulting from improper consumablereplacement.
(5) Other failures and damages not attributable to the manufacturer.
This product is a precision instrument. In order to ensure the reliability of the product, it isvital to perform routine checks and annual inspections. It is highly recommended that amaintenance contract with your New Cosmos representative be made for annual
inspections.
If you have any questions about the routine check, please contact New Cosmos or your
New Cosmos representative.
For repair, please contact New Cosmos or your New Cosmos representative (freightcosts apply).

- 18 -

9. Specifications
Model
Cable length

XO-326IIsA

XO-326IIsB

XO-326IIsC

5m

1m(Curl cord type)

10 m

Target gas

OxygenDetection principle

Galvanic cell sensor

Sampling method

Diffusion

Measuring range(Service range)

0–25.0 vol% (25.1–40.0 %)Accuracy *1+/- 0.5 vol%Resolution

0.1 vol%

Gas alarm set value

1st stage: 19.5 vol%Response time

Within 20 seconds

Alarm method

Beeping with blinking red light and LCD (auto-resetting)Power source

Toshiba alkaline AA battery LR6 x 2 pcs,
Panasonic alkaline AA battery LR6X x 2 pcs, orDuracell alkaline AA battery MN1500 x 2 pcs

Continuous operationtime*2

Approx. 15,000 hours(at 25°C, displaying 21.0 vol%, with backlight off)

Explosion-proof

Ex ia II C T3 Ga (Japan) Intrinsically safe

Ingress protection

Equivalent to IP20

Operating temperature/humidity ranges-10°C to +40°C, 30 to 85%RH (No condensation)

Operating pressure

Atmospheric pressure (800–1100 hPa)

Dimensions(excluding protrusions)

W66 x H170 x D29 mm

W66 x H120 x D29 mm

W66 x H200 x D29 mm

Mass (including
batteries and leather
case)

Approx. 340 g

Approx. 265 g

Approx. 410 g

2nd stage: 18.0 vol%* The above specifications may be subject to change without notice for product improvement.
*1. Under identical measurement conditions.
*2. The operating time (battery life) may vary depending on the environment and conditions of use,
storage period, battery manufacturer, etc.
- 19 -

10. Detection Principle
Galvanic cell sensor (oxygen)
The sensor consists of two electrodes, a membrane, and an electrolyte.
The electrodes are two different metals, noble metal (Pt, Ag) and base metal (Pb). The
noble metal electrode has contact with air via a Teflon membrane. Connecting load
resistance to both electrodes generates a potential difference, which promotes thefollowing reactions:
Noble metal electrode:O2 + 2H2O + 4e− → 4OH−

Base metal electrode:2Pb → 2Pb2+ + 4e−

As a result, the current proportional to the oxygen concentration in the air flows fromthe noble metal electrode to the base metal electrode via the external circuit. Since theelectromotive force changes depending on the temperature, a thermistor is added tocompensate for the ambient temperature variations.
This oxygen sensor is affected by atmospheric pressure because of its principle.
When the unit is turned on in clean air at a standard atmospheric pressure (1,013hPa),
the reading will be automatically adjusted to 21.0vol% and will change in accordancewith the atmospheric pressure change, even though the oxygen level does notchange.
For example, if the unit is relocated to an elevation of 1,000m above sea level(900hPa), in clean air, the reading will change from 21.0vol% to 18.7vol%.
If the unit is turned on, auto zeroing will start, and the reading will be adjusted to
21.0vol%. To convert this figure to the one at standard atmospheric pressure(1,013hPa), multiply it by the correction factor (900÷1013=0.89) to obtain thecorrected oxygen level, 18.7vol% (21.0 x 0.89).
Atmos. Pressure (hPa)
Correction coefficient
O2 level (vol%)- 20 -

11. Glossary
TermTarget gas
Detection range ormeasuring range
Service range

Air adjustment(zero adjustment or
zeroing)
Explosion-proof structure
Intrinsically safe (IS)structure
Hazardous area

Non-hazardous areavol%
Operating temperatureand humidity ranges
Ambient temperature

Definition
Specific gas to be detected and used to trigger alarms.
A range of target gas concentrations that can bedisplayed and can trigger alarms.
A range of target gas concentrations that the detector can
indicate, which are usually outside the Detection Rangeand used only as reference.
To adjust the zero point (or 21.0% for oxygen) in clean air.
Clean air: Air free from target or interfering gases, andcomposed of 20.9–21.0vol% oxygen in dry conditions.
Gas atmosphere: Air containing target or interferinggases.
Structure of an electrical apparatus in order not tobecome an ignition source in a flammable atmosphere
Structure tested (e.g., via spark test) not to become an
ignition source in a flammable atmosphere due to anelectrical spark or hot surface during normal operationand fault conditions.
An area in which an explosive atmosphere is present, or
may be expected to be present, in quantities that require
special precautions for the construction, installation anduse of electrical apparatus.
An area in which an explosive atmosphere is notexpected to be present in quantities such as to require
special precautions for the construction, installation anduse of electrical apparatus.
Gas concentrations given in terms of percentage of cubic
volume.
Ambient temperature and humidity ranges in which thegas detection equipment can operate normally.
Temperature of the air or other media, in the immediate
vicinity of the explosion-protected equipment orcomponent.

- 21 -

Document No.
XO-326IIsET
XO-326IIsET
XO-326IIsET
XO-326IIsET

Revision History
Date
Revision
May 201400 (initial issue)
November 202101
September 2022
02
January 2024
03

Additional copies of this instruction manual may be purchased.
Contact New Cosmos or its authorized representative for ordering.
The contents of this manual are subject to change without notice.

Authorized representative:

Manufacturer:
NEW COSMOS ELECTRIC CO., LTD.
2-5-4 Mitsuya-naka, Yodogawa-ku,
Osaka 532-0036, Japan
www.newcosmos-global.com

XO-326ⅡsET（03）●●.●●