RKI Instruments 72-1004-05 User manual

OX-600

Indoor Oxygen Monitor

Part Number: 71-0376
Revision: C
Released: 9/26/19

Operator’s Manual

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Contents

1 Outline of the Product ...................................................................................................................................... 3

2 Important No tice on Safety .............................................................................................................................. 4

2-1. Danger cases........................................................................................................................................... 4

2-2. Warning cases ......................................................................................................................................... 5

2-3. Precauti ons .............................................................................................................................................. 5

3 Product Components ....................................................................................................................................... 6

3-1. Main unit a nd st an d ar d acc es s or i es ........................................................................................................ 6

3-2. Names and fu nc t i o ns for eac h part ......................................................................................................... 8

4 How to Install ................................................................................................................................................. 11

4-1. Precauti ons for installa ti o n po i nts ......................................................................................................... 11

4-2. Precautions for system designing ......................................................................................................... 12

4-3. Install at io n of m ai n un i t .......................................................................................................................... 14

4-4. Precauti ons for wiring ............................................................................................................................ 17

5 How to Use .................................................................................................................................................... 21

5-1. Before using the monitor ....................................................................................................................... 21

5-2. Preparation for start-up ......................................................................................................................... 21

5-3. Power-on ............................................................................................................................................... 21

5-4. User mode ............................................................................................................................................. 23

5-5. Air calibration ......................................................................................................................................... 25

5-6. Setting v alue check ............................................................................................................................... 26

5-7. Power-off ............................................................................................................................................... 28

6 Alarm Activation an d F u n c tions ..................................................................................................................... 29

6-1. Gas alarm activation .............................................................................................................................. 29

6-2. Fault alarm activation ............................................................................................................................ 30

6-3. External out p ut o per a t ion ...................................................................................................................... 31

6-4. Suppression function ............................................................................................................................. 32

6-5. Air Follower Function ............................................................................................................................. 32

6-6. Auto Air Cal Function ............................................................................................................................. 33

7 Maintenance .................................................................................................................................................. 34

7-1. Maintena nce intervals an d i tems ........................................................................................................... 34

7-2. Maintenance (regular maintenance) mode ........................................................................................... 36

7-3. Preparation for zero and span adj ust ment ............................................................................................ 41

7-4. Zero adjustment ..................................................................................................................................... 42

7-5. Span adjustment .................................................................................................................................... 43

7-6. Environmental setting ............................................................................................................................ 44

7-7. Return to us er m ode .............................................................................................................................. 51

7-8. Componen t Re p lacement ...................................................................................................................... 51

7-9. Replacing a Sensor Cable ..................................................................................................................... 53

7-10. Adding a Sensor Cable ........................................................................................................................ 57

8 Storage and D is posal .................................................................................................................................... 62

8-1. Procedures to store the monitor or leave it for a long time ................................................................... 62

8-2. Procedures to relocate the monitor or use it again ............................................................................... 62

8-3. Disposal of products .............................................................................................................................. 63

9 Troubleshooting ............................................................................................................................................. 64

10 Product Specifications ................................................................................................................................. 66

10-1. List of specifications ............................................................................................................................ 66

10-2. List of accessories ............................................................................................................................... 67

11 Spare Parts List ........................................................................................................................................... 68

12 Appendix ...................................................................................................................................................... 69

12-1. Detect ion pr i nciple of galvan ic c e l l type .............................................................................................. 69

Important precautions ............................................................................................................................... 69

12-2. Definition of terms ................................................................................................................................ 70

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1

1 Outline of the Product

Preface

Thank you for choosing our OX-600 indoor oxygen monitor (hereinafter referred to as the monitor).

Please check that the model number of the product you purchased is included in the specifications on

this manual.

This manual describes the monitor’s specifications and how to use the monitor properly. Read and

understand the operating manual and use this product as described in this manual.

Note that the contents of this manual are subject to change without notice for product improvement. It

is also prohibited to copy or reproduce this manual, in whole or in part, without permission.

Regardless of warranty period, we shall not make any indemnification for accidents and damage

caused by using the monitor.

Make sure to read the warranty policy specified on the warranty.

Purpose of use

This indoor oxygen monitor measures oxygen in the air and issues an alarm using the buzzer and

LCD backlight when oxygen concentration drops below a preset concentration (alarm setpoint). While

displaying measured oxygen concentration on the LCD, the monitor converts it to an analog signal of

4 - 20 mA or 0 - 1 V to output (only 0 - 1 V for the dry battery type) and outputs a two-step gas alarm

contact at a gas alarm state.

The monitor is a safety unit, not an analyzer which performs quantitative/qualitative

analysis/measurement for oxygen. Check the specifications before use and conduct measurement

properly in accordance with purposes.

Definition of DANGER, WARNING, CAUTION and NOTE

Throughout this manual, the following indications are used to ensure safe and effective work.

DANGER

WARNING

CAUTION

This message indicates that improper handling may cause serious damage
on life, health or assets.

This message indicates that improper handling may cause serious damage
on health or assets.

This message indicates that improper handling may cause minor damage
on health or assets.

NOTE

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This message indicates advice on handling.

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WARNING
DANGER

lower exp l o s i v e l imit.

2

2 Important Notice on Safety

To m aint a in the per f or mance of the mon it or an d use it safely, observe the follow ing instructions wi t h

WARNING and CAUTION.

• If an abnorm ality is f ound i n the mon itor, co ntact R KI imm ediatel y. Visit our Web s ite to fi nd your
nearest RKI office.

2-1. Danger cases

• This is not a n explosion-proof unit. Ne ver attempt to measure a gas i n an atmosphere over the

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WARNING

CAUTION

2-2. War ning cases

• Before turning on the monitor, always check that the voltage is compliant with the specifications.
Operating on an u ns t ab l e power supply may cause malfunctions.

• When air calibration is performed, check the atmosphere for freshness before beginning it. If
interference gases exist, the air calibr a t io n ca nn o t b e per f or med properly, thus leading to da ngers
when an oxygen deficiency occurs.

• Do not oper ate th is m onito r in a p lace where c om bustib le/ex plos ive g ases or vap ors a re pr esent .
Operating the monitor in such an environment will lead to extreme dangers.

• Issuance of an oxygen deficiency alarm indicates tha t there are ex treme danger s. Take proper
actions base d o n your ju d g ment.

• Perform spa n adjustment at fix ed in tervals.

• Make sure that the monitor is installed in a place where it is in contact with the atmosphere. If the

monitor is ins ta l l ed in a p l a c e wh ere it is in less co n ta c t wi th t h e a tmosphere, it m ay not detect the
correct ox yge n c onc entration, thus l ea d in g t o an oxygen deficiency accident.

• Do not run the power cable and remote sensor cable of the monitor in parallel with cables of
high-frequency or high-voltage and other device's power cables.

• If a cable of high-frequency or high-voltage and the power cable need to int e rse ct wit h ea ch othe r,
it should be orthogonally connected.

• When wiring, be careful not to apply any stresses on the cables by pulling, tightening or twisting.

• Do not disassemble/modify the monitor. It may invalidate the warranty of the performance.

Changing the s et t in gs wi th ou t un derstanding th em may cause alarm m alf unc ti o ns. Please use the
monitor prop erly in accordance with the operat in g manual.

2-3. Precaut ions

• Do not use a de vice, such as a transce iver, which tr ansm its a radio wa ve near the m onitor or its
cables. It ma y affec t t he m easur em ent. If a transc eive r or oth er radio wave transmitting device is
used, it must be used in a place aw ay from the monitor wh ere it does not disturb the monitor.

• Restarting the monitor within five seconds after turning it off may cause errors.

• This is not a control unit. It is not allowed to use the external out pu t of t he monitor to c o ntrol other

units.

• This is a saf ety unit. N ever fai l to perfor m a regul ar maintena nce to ens ure safe ty. Cont inuing t o
use the monitor withou t performing mainte nance will compromise the sensitivity of the sensor,
thus resulti n g in in ac curate gas detec t i on .

• Do not pick the sensor or buzzer opening with a sharp-pointed item . The unit m ay m alfunc tio n or
get damaged, possibly resulting in incorrect measurements.

• Do not let the m on itor dr aw in wa ter. Do n ot ins tal l the mon itor in a plac e wher e th e m onitor ma y
get wet. Ignoring this may cause malfunction because the monitor is not water- an d drip-proof.

• This is a precis i on de v ice . D o not apply strong shock or vibration to the monitor.

• When the c ase is open ed for wiri ng or other op erati on, do not touch inner parts . W hen wiring, be

sure that excessive pressur e is n ot a pp l i ed to th e p o w e r ca b le and r emote sensor cab le.

• Do not block the sensor vent.

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OX-600 main unit

Sensor unit (Remote t ype)

3

3 Product Components

3-1. Main unit and standard accessories

After opening the shipping box, check the monitor and accessories.
If there is anything missing, contact RKI.

Main unit

For names and functions of individual parts of the monitor and LCD display, see "3-2. Names and

functions for each part" on page 8.

NOTE

• The OX-600’s standard configuration is with the sensor installed in the main unit. Specify when
ordering if you w a nt a n ex t en d er cable with a remote s ensor.

• The sensor int egrated type does n ot i nc lu d e the remote sensor.

• The cable lengths available for the remote sensor type are: 3, 5, 10 and 20 m.

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• Cross-recessed pa n head

screw (2 pcs.)

• 3.2 m AC power cable (1 pc.) *Supplied only with AC specification

Main unit

Remote sensor

Power switch

Cable outlet

Cable outlet

Cable outlet

Cable outlet

Display

Sensor part

Mounting hole f or
3-M3

Use one of the two
for lower holes

To main unit

To main unit

To main unit

Standard accessories

machine screw (2 pcs.)

• Cross-recessed r ou n d he a d w o od

• Operating manual (1 pc.)

CAUTION

• The main unit and sensor unit (remote type) are precision devices. Be careful not to drop the
monitor when installing or uninstalling the main unit or sensor unit. Dropping the monitor may
compromise its original performance or cause malfunctions.

Optional accessories

• Mounting pl at e (1 pc.) RKI par t number: 21-1927

• Gas calibration cup (1 pc.) RKI part number: 81-1153

Outline drawing

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Name

Major function

Turns the power ON/OFF. Slide the switch up to power on and down
to power off.

Hold down this button to enter the user mode.
It is also used to cancel or skip during setup.

Used to change the screen and increase numerical values during
setup.

Used to cha nge the screen and decr ease numerical valu es during
setup.

(5)

SET button

Used to confirm the setting.

(6)

Buzzer sound opening

Emits operation and alarm sounds. (Do not block it.)

(7)

Sensor part

Detects a gas to be detected. The sensor is inside the c o ve r.

(8)

Screw

Loosen this screw to open the case.

3-2. Names and functions for each part

This section describes the names and functions of the individual parts and LCD display that make up the
monitor.

Main unit

(1) Power switch

(2) MODE button

(3) ˄ button

(4) ˅ button

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Name

Major function

(1)

Operating state display

Displays the oper ating status. Blinks at a normal state.

(2)

First alarm display

Lights up in orange at a first alarm state.

(3)

Second alarm display

Lights up in red at a second alarm state.

(4)

Fault alarm display

Lights up in red at a fault alarm state.

Concentra tion value
Maintenance indicator

Displays the gas concentration.
Maintenanc e it ems and others are displayed duri ng se tu p.

(6)

Unit display

Displays the unit (%) according to the specification.

Gas name disp l ay
Maintenance display

Displays the gas name (O2: Oxygen).
Maintenanc e it ems and others are displayed duri ng setup.

(8)

AC/DC power display

Lights up when the monitor is operating on AC or DC power.

Displays the battery level when the monitor is operating on dry
batteries.

(10)

This is not used for th e m o ni t or.

CAUTION

characteristic of rechargeable batteries.

Display

(5)

display

(7)

(9) Battery level icon

Installation of batteries (for dry battery type)

When the moni tor is us e d f or th e fi rs t t ime, or when the battery level is low, install or re p lace with the new
AA alkaline dry batteries according to the following procedure.

• Turn off the power of the monitor b efore replacin g th e ba tteries.

• Replace the b att eries in a safe plac e w h er e ex p l osive gases are no t pr esent.

• Never fail to use alkaline batteries. If a rechargeable (secondary battery) nickel-cadmium batt ery

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or nickel metal hydride battery is used, the specifications cannot be met, such as continuous
operating time.

• Replace bot h ba tt eries at the same time.

• Pay attention to the polariti es of the bat te r i es wh e n i nstalling them .

• Completely lock the battery cover after installing the batteries. If the battery cover is not

completel y locked, the dry batt eries may fall out .

• Do not use rechargeable batteries that may interrupt a measurement due to the discharge

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1

Check that the power of the

2

Remove the battery case from
the monitor.

Unlock the tab of the ba ttery case.

4

Put the battery case back in t he

New battery

main unit is turned off.

If the power is turned on, slide the
power switch down to turn it off.

3

Put new batteries (tw o AA
alkaline dry batteries) in the
battery case.

Confirm that the polarities of the
batteries are correct.

monitor.

Push the circled area an d
confirm that the tab is locked.

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<Do not install the monitor in a place with vibrations or shocks.>

<Do not install the monitor in a place ex posed to water, oil or

<Do not install the monitor in a place where the temperature

CAUTION

4

4 How to Install

4-1. Precaut ions for installation points

When installing the monitor, never fail to observe the following precautions.
Ignoring the pr ecautions may damage the monitor, resulting in inaccurate gas detection .

• This is a pr ecision device. Because the monitor may not provide the specified performance in
some places (environments), check the environment in the installation site, and then take
appropriate actions if necessary. Because the monitor plays an important role for safety and
disaster prevention, it must be installed in appropriate points.

• Do not instal l th is product in any of th e fo l l o wi ng locations.

• Place exposed to direct su nli g ht or o utside

• Place exposed to water

• Place exposed to ventilation from an air conditioner, etc.

• Place exposed to soot, smoke or steam

• Place wher e the temper ature drops below -10ºC or ris es over 40ºC or wher e the temperat ure

changes suddenly

• Place with h ig h h umidity like a bath r o om

• Place with bad ventilation such as behind a curtain or under an overhang.

The monitor consists of sensitive electronic parts. The monitor must be installed in
a stable place wit h ou t vi br a ti o ns or s hoc k s , etc . an d it c an no t drop.

chemicals, etc.>

When select in g i nstallation poi nts, avoid a place wh ere the monitor is ex p osed to
liquids such as wate r, oil, or chemicals.

drops below -10ºC or rises over 40ºC.>

The operatin g temperature of the m oni t or is -10 to +40ºC. Install the monitor in a
stable place not exceeding the operating temperature range.

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<Do not install the monitor in a place ex posed to direct sunlight

or the monitor cannot adjust to sudden changes in the temperature.

<Keep the monitor (and its cables) away from noise source

high-frequency/high-vo lt a ge devices exist .

<Do not install the monitor in a place where maintenance of the monitor cannot

in a place where m ai nt en a nc e in v ol ves d an g er s , for e xample, near a high-voltage cable.

Power supply
voltage

Up to 10 milliseconds

system), etc. outside the monitor.

Do not use it with a power supply of large power load or high-frequency noise.
Use a line filter, etc. to avo i d th e noise source if n ec es s ary.

CAUTION

or sudden changes in temperature.>

Avoid a place where the monitor is exposed to direct sunlight or radiant heat
(infrared rays emitted from a high-temperature object), and where the unit
temperature changes suddenly. Condensation may be formed inside the monitor,

devices.>

When select in g i nstallation poi nts, avoid a place wh ere

be performed or where handling the monitor involves dange r s.>

Regular maintenance of the monitor must be performed.
Do not install the monitor in a place where the machinery must be stopped when m aint en a nc e is
performed, w h er e parts of the machinery must be remo ve d to per f or m maintenanc e, or w her e the
monitor cannot be removed because racks or other things prevent access to it. Do not install the monitor

4-2. Precautions for system designing

Note the following precautions for system designing of the monitor.

• An unstable power supply and noise may cause malfunctions or false alarms.

Using a stable power supply

The external output and alarm contact of the monitor may be activated when the power is turned on, when
momentary blackout occurs, or when the system is being stabilized. In such cases, use a UPS
(uninterruptible power system), or take appropriate actions on the receiving side.
The monitor m us t b e provided with the following power su pp ly.

100 - 120 VAC ±10% (50/60 Hz), 24 VD C ± 10 % or AA alkaline dry battery (2 pcs.)

Allowed time of
momentary
blackout

Others

(To recover from the momentary blackout for 10 milliseconds or more, restart the
monitor.)

Example of actions

To ens ur e continuous oper at i on a nd ac t i va tion, install a UPS (uninterruptible power

Example of actions

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Alarm contact

Power
supply

Power
supply

Coil

External relay

Load

*SK1, SK2: Surge absorbing part

Proper use of alarm contact

The alarm contact of the monitor is used to transmit signals to activate an external buzzer, alarm lamp or
rotating lamp. Do not use it for controlling purpose (e.g., controlling the shutdown valve). The contacts can
be configured as Form A or Form B but are factory set as Form A contacts and the y ar e nor mally
de-energized.

CAUTION

• The b contact (break contact) under de-energized state may be open ed momen t ar ily by a phy sic al

The specifications for the external output gas alarm contact of the monitor are ba sed on the re sistan ce load
conditions. If inductive load is used at the alarm contact, the following errors will occur easily because
counter electromotive force is generated at the contact.

• Deposition, defective insulation or defective contact at the relay contact

• Damage of any electric parts due to high-voltage generated inside the monitor

• Abnormal o perations by an out-of-control CPU

If load is to be activated, appropriate measures must be taken to stabilize the operation of the monitor and
protect the alarm contact referring to the following information.

• Relay it with an ex ternal relay at a lower vo l ta g e of 120 VAC or below (contact amplification). At the same

• In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay if

• It may be recommended that the surge absorbing part should be attached to the contact for certain load

shock, such as external force.
When the b contact is se lected for the alarm con tact, take appr opriate actions to prepare f or a
momentar y activ ation s uch as ad ding a signa l del ay oper ation (app roxim atel y one sec ond) to t he
receiving side of the b contact.

time, the surge absorbing part SK1 suitable for the specifications must be attached to the external relay.
necessary.
conditions. It must be attached to an appropriate position by checking how the load is activated.

(Lower voltage relay)

CAUTION

• In princip le, do not activa te an inductive load at the alarm contact of the monitor. In part icular,
never use the i nd uc t i ve l oa d to activate a fluorescent lamp or motor.

• If inductive load is activated, relay it with an external relay (contact amplification). However,
because the coil of an external relay also involves inductive load, select a relay at a lower voltage
(120 VAC or below), and then protect the contact of the monitor with an appropriate surge
absorbing part, such as a CR circ u it.

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Mounting hole (for M4
screw)
*Supporting the switch box

CAUTION

4-3. Install ation of main unit

Install the main unit on the wall 50 to 180 cm up from the floor.
If wall screws are available, remove the screw at the lower part of the main unit to open the cover and
install the unit using the mounting holes on the back of the unit.

• Install the sensor in a place not directly exposed to ventilation from an air conditioner.
Sudden changes in the temperature may cause the readings to disappear.

NOTE

• To install the main unit to the wall with screws, use the mounting holes on the back of the unit
according to the following procedure.
(1) Loosen the screw at the lower part of the main unit and open the surface cover of the case.
(2) Fix the main unit with two screws (M4) through the mounting holes.
(3) Put the surface cover back on the case and tighten the screw at the lower part of the main unit.

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Mounting hole
(for M4 screw)

Mounting hole for 3-M3

Use one of the two for lower holes

To main unit

If the monitor operating on dry batteries needs to be removed with the power on, use the mounting plate
(option). When the m ounting plate is used, install the plate before installing the main unit.

<Installat io n of Remote Sensor>
Tighten the screws through one upper mounting hole and one of the two lower mounting holes.

NOTE

• To install the r emote sensor to the wa ll using screws, use the mounting holes on the back of the
sensor accor d i ng to th e following procedure.
(1) Open the surface cover of the remote sensor.
(2) Attach the sensor with two screws (M4) th roug h th e mo un tin g hol e s (one up pe r moun tin g hol e an d

one of the two lower mounting holes).

(3) Put the cover back on the remote sensor.

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Secure as battery replacement space

(Only for dry battery type)
Installation dimension drawing (Mounting plate not used)

Compatible with JIS single switch box

Secure as
installation space

Installation dimension drawing (Mounting plate used)

Secure as battery replacement space

(Only for dry battery type)

<Maintenance Space>
For the dry battery type, be sure to leave space below the unit for battery replacement. If the mounting
plate (optional) is used, be sure to leave space above the unit so th at it can be instal led by sliding.

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For AC power

Solid wire/s tr an ded wire: 0.2 - 1.5 mm

For DC power

CVVS: 0.2 - 1.5 mm

For signal cable
(4 - 20 mA/0 - 1 V)

For contact

Cable such as CVV (0.2 - 1.5 mm2) Up to 4 cores

CAUTION

CAUTION

4-4. Precautions for wiring

If the monitor operates on AC or DC power of if an inductive load is us e d a t th e a l ar m contact, wirin g wor k
is required.
The following cables are recomm ended for wiring th e monitor with the p o wer sup ply, signal cabl e an d
contact.

<Recommended Cabl es>

2

2

CVVS: 0.2 - 1.5 mm

2

• Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not to
apply stresses on the monitor when (overweight) cables are installed.

• The power and signal cables must be wired separately from the motor power cables.

• When stranded wires are used, prevent wires from contacting each other.

<Cable Connection Conditions>

Connectable cable, bare wire length and connection tools are as follows:

2

• Cable: 0.2 - 1.5 mm

• Bare w ir e le n gt h: 10 - 11 mm

• Connecting tools: Dedicated screwdrivers manufactured by WAGO and equivalent (edge width 3.0 to 4.5
mm x 0.5 mm)

The specified bare wire length must be observed when the wire insulation is peeled off.

• Improper clamping of the wire due to a shorter bare wire length may cause defective electric
conduction or heating.

• Catching the wire insulation due to a shorter bare wire length may cause defective electric
conduction or heating.

• Exposing the wire due to a longer bare wire length may cause defective insulation or a short
circuit.

• Be careful not to break up the wire. If the wire is broken up when inserted to the terminal, this may
cause defect i ve ins u la t io n or he at i n g.

<Compatible Bar Terminal>

For a bar terminal, the following items are available. See the spare parts list for RKI part numbers.

• Bar terminal (ferrule): Model 216 Series (manufactured by WAGO)

• Crimping tool: Model VarioCrimp 4 (206-204) (manufactured by WAGO)

CAUTION

• A bar terminal of the specified model must be used. Using other bar terminals invalidates the
warranty of th e per f or mance.

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1

Push the push button strai ght

equivalent to open the spri ng.

2

Insert a wire with a specif ied

3

Release the screwdri ver.

The wire is conn ec t e d.

CAUTION

How to connect to terminal plate

When cables (wires) are connected to the terminal plate inside the main unit, use the dedicated
screwdriver or a compatible flathead screwdriver.
When connecting a stranded wire, be sure to press the push button and open the spring while connecting
the wire.

downward using the
compatible screwdr i ver or

bare wire length (10 mm) unt i l
the end of it reaches the
deepest point.

• Never fail to use the correct tool.

• Do not insert more than one wire into one wiring hole. If the total size (mm

within the maximum wire connection range of the terminal plate, it may cause reduced spring
clamping for ce, defective i n s ul at i o n d u e t o clogged wir e sheath, defec t i ve co ntact or com ing off of
wires.

2

) of two or more wires is

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Compatibl e sc r ew d riv e r m anu f a ct u red by WAGO

Screwdriver (M) straight type

210-120J

Screwdriver (M) straight type (short shaft & grip)

210-350/01
210-657

Screwdriver (M) straight type (insulated shaft type)

210-720

NOTE

<Compatibl e S cr ewdriver>

• When opening the spring, use the compatible screwdriver manufactured by WAGO or equivalent (a
screwdriver with an edge width of 3.0 to 4.5 mm x 0.5 mm which can fully open the spring: See the
table below). In doi ng thi s wo rk, be ca reful no t to apply exce ssive fo rce. Ignoring this may damag e the
housing/push buttons or cause dropping off of the p ush buttons.

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For external output signal (4 - 20 mA for line

3: (not used)

AC power (TND)

Terminal board for AC power

Terminal board for DC power

DC power (TND)

Figure of terminal plate

The overview of the terminal plate inside the main unit is as follows:

powered/0 - 1 V for battery powered) (TN2) Alarm contact (TN3)
1: (+) 1 - 2: ALM1 (First)
2: (-) 3 - 4: ALM2 (Second)

<For Connecting AC Power>

100 - 120 VAC ± 10% (50 Hz/60 Hz)
1: L
2: N
3: FG

<For Connecting DC Power>

24 VDC ± 10%
1: (+)
2: (-)
3: N.C

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Turn on the power switch.

sensor.

Power
switch

5

5 How to Use

5-1. Before using the monitor

Follow the operating precautions.
Ignoring the pr ecautions may damage the monitor, resulting in inaccurate gas detection .

CAUTION

• After you r eceive the moni t or , start using t he monitor with i n t h e s p ecified operat i on start limit of its

5-2. Preparation for start-up

Check the following points before starting oxygen concentration monitoring.

- Before turn in g o n th e power, check that the monitor is ins t a ll e d pro p erly and that ex t ernal wiring is don e
properly.

- Check that th e p o w er s up ply voltage is com pl ia nt w ith the specifications.

- Because the ex t ernal contact may be activated d ur in g th e adjustment, t ak e m easures to prevent an
activated contact from having influences on external circuits.

5-3. Power-on

1

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The LCD turns on .

The monitor goes through a

The monitor is i n th e m easurement

battery.

CAUTION

25-second warmup.

state. The LCD backlight for AC and
24 VDC versio ns wi l l be on under
non-alarm conditions. The LCD
backlight f or t he bat tery powered
version will b e off under non-alarm
conditions in order to conserve

• Do not turn off the monitor during the w arm up. W hen t urni ng it on ag ain , abn orm al oper ati on m ay
occur.

• After initia l warmup, perfor m air calibration .

• Air calibration must be performed within one hour of power-on.

NOTE

• External out pu t d ur i n g i nitial clear is as fol lo ws :

• 4 - 20 mA: About 17.4 mA fixed

• 0 - 1 V: About 0. 84 V fixed

• To turn off the power, slide the power switch down.

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1

While in the measuring st at e,

2

In the user mode, press the ˅

3

After maki ng desired changes,

5-4. User mo de

The user mode allows for performing air calibration and checking setting values.

press and hold the MODE
button for three seconds.

The user mode is displayed.

or ˄ button to scrol l t hr ough
the items.

hold down the MODE button.

The monitor returns to the measuring
state.

WARNING

• After air calibration, hold down the MODE button to return to the mea suring state.
The monitor automatically returns to the measuring state in 10 hours.

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Item

Details

LCD display

Remarks

Program version

Show the current

Air calibratio n

Perform the air

Press the SET

(P. 25)

Setting value check

Check settings such

Press the SET

(P. 26)

Maintenance mode

Access maintenance

Items that can be checked and set in user mode

program version.

access

calibration.

as alarm setpoint,
zero suppression
value, and air
pressure correction.

mode.

button to go to
the air
calibration
screen.

button to go to
the setting
confirmation
screen.

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1

In the user mode, press the ˄

Press the SET button.

3

Press the SET button again.

4

Press the ˅ or ˄ button to

Press the SET button.
* If air calibration fails, "FAIL"

6

After checking the setting

state.

CAUTION

5-5. Air ca l ibration

An air calibration sets the fresh air reading to 20.9%. By default, the OX-600 automatically does an air
calibration once a month. See 6-6. Auto Air Cal Function on page 33 for more discussion.

button once.

2

Press the SET button to d isplay the
current concentration.

The concentration display
blinks.

5

adjust the concentratio n val ue
to "20.9%".

Air calibration is performed.
After air calibration i s
completed, "PASS" is
displayed and the monitor
returns to the display in st ep 2.

is displayed.

value, hold down the MODE
button.

The monitor returns to the measuring

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• When turning on the p ower, check the atm osphere for freshness and never fail to p erform air

- 25 -

calibration.

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1

In the user mode, press the

2

Press the SET button.

<First Alarm Setpoint

3

Press the ˅ or ˄ button to
check the setting value.

<Second Alarm Setpoint

<Alarm Delay Time Display

<Zero Suppression Value

5-6. Setting value check

Typical setting values can be checked by the following procedure.
In the user mode, setting values cannot be changed. T o change setting values, you must enter the
maintenance mode as described on P.36.

˄ butt on twice.

Press the SET button to display
the first alarm set point.

Display>

Display>

(seconds)>

Display>
The zero suppression value
is displayed.

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<Zero Follower ON/O FF

<Air Pressure Correction

checked.

<Alarm Summary Display>

history (up to 10 entries) .

5

After checking the setting

Display>

Not used.

ON/OFF Display>
Whether air pressure
correction is enabled (ON) or
disabled (OFF) can be

Press the SET button t o
display the gas
concentration and date / t ime
alternately as the alarm

value, hold down the MODE
button.

The monitor returns to the
measuring state.

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5-7. Power-off

Slide the power switch down to power off.
After turning off the power switch of the monitor, turn off the power supply of the monitor.

CAUTION

• When the monitor is turned off, an alarm may be triggered on the upper (central) system.
Before turning off the monitor, the inhibit (point skip) on the upper (central) system must be
activated.
Decide whether the power can be turned off by checking the operation of the devices connected to
the external o ut put or external co nt ac t out put terminal of the m oni t or .

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First alarm display

Second alarm displ ay

Concentration display

at over scale

6

6 Alarm Activation and

Functions

6-1. Gas alarm activation

A gas alarm is activated when detected gas concentration reaches the preset alarm setpoint.

NOTE

• The alarm setpoint (fi r st alarm an d se con d ala rm) is fac to ry -set. The setti ng v alu es can be c ha nged i n
the maintenance mode (P.36).

• Although t he alarm delay time ( standard: 2 seconds) is set to preven t a false acti vation, it can be
changed in the maintenance mode (P.36).

Display operation

The LCD backlight for AC and 24 VDC vers i ons will be on under non-alarm conditions. The LCD backlight
for the battery powered version will be off unde r no n-alarm conditions in order to conser ve ba tt ery.

<Gas Alarm Display (In case of oxygen deficiency state)>

The alarm disp l ay is a two-step alarm consisting of the first alarm display (ALM1) and the second alarm
display (ALM2).
It lights up i n o range w hen the concentration drops below the first alarm state (ALM1: 19.5%) or reaches its
alarm setpoint and in red when concentration drops below the second alarm state (ALM2: 23.5% ) or
reaches its alarm setpoint.

<Alarm Display at O ver Scale>

If a gas alarm is activated when the concentration display is over scale (oxygen concentration exceeds

25.0%), the alarm display lights up as follow s:

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Activate:

- Alarm lamp (ALM2)

- Alarm contact

(Terminal

plate 3,4)

Time

2second
alarm
delay

Second Alarm Setpoint

First

Alarm Setpoint

Activate:

-

Alarm lamp

(ALM1)

-

Alarm contact

(Terminal

plate 1,2)

Concentration

2second

alarm

delay

WARNING

contact acti v at io n is reset.

Contact activation

The contact is ac t i v at ed when the gas concentration drops below the alarm setpoint value. The contact
activation is reset automatically when the gas concentration exceeds the alarm setpoint value (except for
the dry battery type).

• If the MODE or SET button is press e d to en ter another m ode wh i l e a n al arm is triggered, t he

Response to gas alarm (In case of responding to leaked gas)

When a gas alarm is triggered, t ak e ac t i ons in accordanc e w i t h your m ana gement rules of gas alarm.
Normally, take the following actions.

• Check the reading of the monitor.

• If the gas alarm display continues to be displayed, close the main valve of the gas, and then

check that the oxygen concentration reading is back to normal.

NOTE

• If an oxygen deficiency is momentary, the reading may already have returned to normal when
checking it . In a ddi tio n, wh en th e al arm is tr igg ered b y nois e or oth er inc ide nt al cond iti ons other th an
a gas, the readi ng m ay have already r et urn ed to normal.

6-2. Fault alarm activation

A fault alarm is triggered when the monitor detects abnormalities. When a fault alarm is triggered, "FAULT"
in the LCD display lights up in red.
An error message is displayed in the LCD. Determine the cause and take appropriate action.

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External output

(4 - 20 mA)

External output

(0 - 1 V)

Initial

17.4mA

0.84V

Fixed values

0 - 1V

Depending on gas

concentration

1V -

Depending on gas

concentration

Trouble

21.5mA

1.1V

Fixed values

Maintenance mode

menu

0.84V

0 - 1V

Depending on gas

concentration

0 - 1V

Depending on gas

concentration

Alarm summa r y

check

0 - 1V

Depending on gas

concentration

0 - 1V
0 - 1V

Depending on test

value

Fault alarm displ ay

After the monitor is successfully returned from the fault, it enters t he 25 sec on d w armup period.
If the monitor has problems and is repeatedly malfunctioning, contact RKI immediately.

NOTE

• For informati o n on malfunctions (error messages), see "Troubleshooting" (P.64).

6-3. External output operation

<4 - 20 mA Output Table>

Status

Normal

Scale over

4.0 - 20.0mA

20.1mA -

Remarks

17.4mA

Air calibration

Alarm setpoint check

Date/time ch ec k an d

setting

Alarm test

* External out pu t 4 - 20 mA can be adjusted in the maintenance mode "2-48 MA20".

0 - 1 V cannot be adjusted.

4.0 - 20.0 mA

4.0 - 20.0 mA

4.0 - 20.0 mA

4.0 - 20.0 mA

4.0 - 20.0 mA

Fixed values

Depending on gas

concentration

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<Suppression Disabled>

The reading is displayed with the

<Suppression Enabled >

6-4. Suppression function

The monitor is i nf l ue nced by environmental changes (temperat ur e, humidity and oth er c har ac t eristics),
which affects the reading.
Therefore, the reading might fluctuate becaus e of the atmosphere, ev e n i n a nor mal environment.
The suppression function is used to hide (suppress) the fluctuation of the reading under the setting value,
indicating a l e v el t ha t can obscure infl ue nc es by environmental changes i n th e atmosphere.
This function can be set in the maintenance mode (P.36).

fluctuation near the atm ospher e le vel
included.

The atmosphere level can be
displayed within the standard setting
(±0.5%).

6-5. Air Follower Function

OX-600s manufactured after mid-2019 have a DIP switch that turns the air follower function on (default) or
off.

If the air follower function is turned on (de fault) the OX-600 automatic a lly adjusts the rea di n g to 20.9%
every hour if the indicated value is within ±0.5% of 20.9%.

The DIP switch is locat ed on the sen sor board. To adjust the switch, either open the mai n unit or the sensor
unit (if using a remote-mounted sensor). The air follower switch is the leftmost of the two switches. When
the switch is up , th e a ir fo l l o wer is o n. When the switch is d o w n, the air follower is off.

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6-6. Auto Air Cal Function

OX-600s manufac tured af ter mid-2019 have a DIP switch that turns the auto air cal function on (default) or
off.

If the auto air c al func t ion is turn ed o n ( def aul t), the OX-60 0 autom atic ally perf orm s an air ca libra tion onc e a
month. If the OX-600 is not in a fresh air environment, the air calibration will be inaccurate.

The DIP switch is loc ated on the s ens or boar d. To adjust the switc h, eit her ope n th e main u nit or the s enso r
unit (if us ing a rem ote-mount ed sensor ). The au to air cal switch is the ri ghtmost of the t wo switches. W hen
the switch is up, the auto air cal function is on. When the switch is down, the auto air cal function is off.

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Maintenance

item

Daily

maintenance

Monthly

maintenance

Regular

maintenance

Power supply
check

Check that the LCD display lights up.

Concentration

Check that the concentration display

around it.

Alarm test

Inspect the a larm circuit by usi n g th e
alarm test function.

Span
Adjustment

Perform spa n adjustment usin g a
calibration gas.

Gas alarm
check

Check the gas al ar m using a
calibration gas.

7

7 Maintenance

The monitor is an important instrument for the purpose of safety.
To m aint a in the per f or mance of the mon it or an d improve the reliability of safety, perform regular
maintenance.

7-1. Maintenance intervals and items

This is a safet y un it . Ne v er f ai l to perf or m daily and regul ar maintenance bef or e use.

• Dai ly maintenance: P er f or m maintenance bef ore commenc ing each work.

• Regular maintenance: Perform maintenance once or more for every six months to maintain the
performanc e as a safety unit.

Maintenance content

  

displa y ch ec k

WARNING

• If an abnorm al ity is found in the mon it or , con t ac t R K I i m mediately.

value is "20. 9% ".
When the reading is incorrect,
perform the air calibration after
ensuring that no other gases exist

  

−

− −

− −

 

NOTE

• The built-in sensor of the monitor has a validity period and must be replaced regularly.





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Item

Services

Checks the power supply voltage.
(Verifies that relev ant points can be identified on the system.)

Concentration
display check

Verifies that the concentration display value is "20.9%" at the atmosphere level.
Performs the air calibration if the reading is incorrect.

Inspects the alarm circuit by using the alarm test function.
Checks the alarm ac tivation such as a buzzer.

Span adjustm e nt

Performs span adjustment usi n g a c a libration gas.

Checks the gas alarm by using the calibration gas.

Checks the alarm ac tivation such as a buzzer.

Checks dust or damage on the surface, cover or internal parts of the unit, and
(Visual diagnosis) Replaces parts which are cracked or damaged.

Unit operation
check

Replacement of
parts

About maintenance services

We provide services on regular maintenance including span adjustment, other adjustments and
maintenance.
Our qualified service engineers have expertise and knowledge on the dedicated tools used for services,
along with oth er pr od uc ts.
To maintain the safety operation of the monitor, please use our maintenance service.
Typical maintenance services are listed as follows. Please contact RKI for more information.

<Typical Maintenance Services>

Power supply
check

Alarm test

Gas alarm check

Cleaning and
repair of the unit

consumable

Checks that the LCD display lights up.

Checks the alarm display (Checks the activation each for ALM1 and ALM2.)

Checks the alarm. (Checks triggering of alarm when the alarm setpoint is reached.)
Checks the del ay time. (Check s tim e to d e lay until the alarm is tr ig g er e d.)
Checks the alarm display (Checks the activation each for ALM1 and ALM2.)

cleans or repairs such parts as needed.

Operates the buttons to check the operation of functions and parameters, etc.

Replaces consumable parts, such as a sensor.

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1

While in the measuring st ate, press and hold t he MODE

2

In the user mode, press the ˄ button three times.

3

Press the SET button.

Hold down the SET button for three seconds.

5

To select items in the maintenance mode, press the ˅ or
˄ butt on t o display setting and check items.

<Test Functions (2-0 TEST)>

Refer to "Test functions" (P.39) for details.

<Air Calibration (2-1 ZERO)>

7-2. Maintena nce (regular ma intenance) mode

The maintenance mode allows for checking the status of the monitor and adjusting and changing the
settings.

How to enter maintenance mode

To enter the maintenance mode, use the following procedure.

button for three seconds.

The user mode is displayed.

4

The monitor enters the maintenance mode.

Perform the following tests.

2-00: Gas test
2-01: Alarm test
2-02: Fault ala rm test
2-03: Displa y test
2-04: Not used.

Perform the air calibration.
Refer to "Zer o adjustment" (P.42) for details.

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<Span Adjustment

<Zero/Span Initialization

<Environmental Setting

button and refer to "Environmental setting"

(P.44) for details.

<Display Setting (2-5 DISP)>

<Factory Mod e S wi tc h i n g

(2-2 SPAN)>

(2-3 SDEF)>

(2-4 S ET)>

Perform the span adjustment.
Refer to "Span adjustment" (P.43) for details.

Not used.

Specify the en v ir onmental settin gs .
2-40: Not used.
2-41: Not used.

2-42: Alarm Value Setting (AL-P)
2-43: Alarm Delay Time Setting (AL-D)
2-44: Alarm Pattern Setting (AL-T)
2-45: Zero Suppression Type Setting (SP-T)
2-46: Zero Suppression Value Setting (SAPP)

2-47: Not used.

2-48: External Output Adjustment (MA20)
2-49: Sensor Operation Start Setting (SSET)
2-4A: Date/Tim e S ett ing (DATE)
2-4b: Air Pressure Correction Setting ON/OFF (P-A)

2-4C: Not used.

2-4d: Buzzer ON/OFF Setting (BZZR)
2-4E: Gas Alarm Contact Functionality ON/OFF (AL-R)
2-4F: External Output Signal ON/OFF
2-4H: LCD Backlight ON/OFF (LCD)
2-4J: Alarm Pattern Setting

2-4L: Not used.
Press the SET

Not used.

(2-6 FMODE)>

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Not used.

<User Mode Switching

6

After making the necessary adjustm ents, hol d down the

(2-7 UMODE)>

The monitor returns to the user mode.
Press the SET button twice to return to the user mode.
Refer to "Return to user mode" (P.51) for details.

MODE button.

The monitor returns to the measuring state.

WARNING

• After air calibration, hold down the MODE button to return to the measuring state.
The monitor automatically returns to the measuring state in 10 hours.

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2-0 TEST

2-00 GAS

activated.

2-01 ALM

and 2-4F.

2-02 FALT

Test functions

Press the SET button
to enter the test mode.

Press the SET button
to perform a gas test.
Similar to the detection
condition, the reading
changes and an alarm
is displayed after the
gas is introduced, but
the contact is n ot

Press the SET button
to perform an alarm
test.
Use the ˅ button to
decrease the display
value to the alarm
setpoint to trigger an
alarm.
The externa l ou tp u t
signal and contact
activation are enabled.
To disable them,
specify the ac t i vat io n
setting for each in 2-4E

Press the SET button
to perform a fault
alarm test.
Use the ˅ or ˄ button
to enable the function
to trigger an al arm.

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2-03 LCD

2-04 LCD

Press the SET button
to perform a LCD
displa y tes t.

To disable the enabled
function, use the ˅ or
˄ button to select it
and press the S ET
button.

Not used.

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Equipment

Calibration cup, fixed flow regulator, sample tubing

N2 (99.9 vol% or more): Zero adjustment, reading

delay time check

For details ab ou t op er at i on ,
For details ab ou t op er at i on ,

(P.43).

7-3. Preparation for zero and span adjustment

Perform zero and span adjustment of sensors using a calibration gas more than once every six months.
The zero and span adjustment requires dedicated equipment and a calibration gas. Please contact RKI.

<Required Equipment/Material>

Zero

adjustment

Span

adjustment

1. Screw the fixed flow regulator into the calibration cylinder.

2. Use the calibration tubing to connect the regulator to the calibrati on cup’s inlet.

3. Attach the calibration cup to the OX-600.

accuracy 1, response time check
O2 (10.0 - 11.0 vol%): Reading accuracy check 2, alarm

Fresh air or zer o air if a fr e s h air en v ir onment cannot be
verified

refer to "Zero adj ustment"

42).

(P.

refer to "Span adjustment"

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2-1 ZERO

Press the SET button

Turn the regulator’s
Press the SET button.

"PASS" is displayed

adjustment ag a in .

Zero adjustment will

knob clockwise to

7-4. Zero adjustment

Perform the preparation (P.41) before performing a zero adj us tment.

Navigate to the zero
adjustment screen.

to display the current
concentration.

knob counterclockwise
to open the regulator.
Allow gas to flow to the
sensor for 2 minutes.

when adjustment is
successful, and "FAIL"
is displayed when it
fails.

If "FAIL" is displayed,
perform zero

end.
Turn the regulator’s
close it.

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2-2 SPAN

Press the SET button

for 2 minutes.

Press the
Press the SET button.

"PASS" is displayed

adjustment ag a in .

Span (fresh air)

7-5. Span adjustment

Perform the preparation (P.41) before performing a span adjustment. If a fresh air environment cannot be
verified, a cylinder of zero air will have to be used.

Navigate to the span
screen.

to display the current
concentration.
Turn the regulator’s
knob counterclockwise
to open the regulator.
Allow zero air to flow

concentration SET
button again. While the
concentration display
is blinking, use the ˅
or ˄ butto n t o adjust
the reading to "20. 9%".

when adjustment is
successful, and "FAIL"
is displayed when it
fails.

If "FAIL" is displayed,
perform span

adjustment wi ll e nd .

Turn the regulator’s

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close it.

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2-4 SET

2-40

2-41

2-42 AL-P

7-6. Environmental setting

Specify the
environmental
settings.

Not used.

Not used.

Set the alarm setpoint
(first, second).
Use the ˅ or ˄ button
to set the alarm
setpoint and press the
SET button to confirm
it.

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2-43 AL-D

to confirm it.

2-44 AL-T

2-45 SP-T

2-46 SAPP

Sets the alarm delay
time (seconds).
Use the ˅ or ˄ button
to set the time and
press the SET button

Set the alarm pattern
setting.

nL: Non latch in g
(Self-resetting)
L: Latching

Use the ˅ or ˄ button
to select the setting
and press the SET
button to confirm it.

Set the suppression
type.
Use the ˅ or ˄ button
to select the type and
press the SET button
to confirm it.

Slop: when the reading
comes out of zer o
suppression range, the
change is gradual.

Cut: when the reading
comes out of zer o
suppression range, the
change is a step jump.

Set the suppression
value (%).
Use the ˅ or ˄ button
to set the value and
press the SET button
to confirm it.

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2-47

2-48 MA20

2-48 MA20

2-49 SSET

Not used.

Adjust the external
output (4 mA, 20 mA).
Use the ˅ or ˄ button
to set the value and
press the SET button
to confirm it.

When "AdJ" is
displayed, connect an
ammeter. Then, use
the ˅ or ˄ button to
adjust the value to 4
mA or 20 mA and
press the SET button
to confirm it.

The monitor returns to
MA20.

Set the sensor
operation start.

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2-4A DATE

Set the date/time.
Use the ˅ or ˄ button
to change the year,
month, day, hour and
minute and pres s th e
SET button to confirm
it.

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2-4b P-A

2-4C

2-4d BZZR

Set the air press ure
correction to ON/OFF.

Not used.

Set each of the first
and second alarm
buzzers to ON/OFF.

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2-4E AL-R

2-4F MA-O

Turn the relay contact
functiona lity on or off.

If set to on, the relay
will change state
during an alarm
condition.

If set to off, the relay
will not change state
when an alarm
condition occurs.

Set the external output
signal during an alarm
test to ON/OFF.

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2-4H LCD

2-4J Alarm Pattern

Change the alarm

(first alarm

decreasing, second

, or

(both alarms

Set the LCD backlight
to ON/OFF.

Setting

pattern to L-LL (both
alarms decreasing),
L-H

alarm increasing)
H-HH
increasing).

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2-7 UMOD

1

Remove the sensor cover of the

Insert a coin straight to the
of the monitor to release the

Sensor cover

7-7. Return to user mode

The monitor returns to
the user mode.

7-8. Component Replacement

<Replacing the Batteries (for dry battery type)>

Refer to "Installation of batteries (for dry ba ttery type)"(P.9) for instructions to replace the batteries.

<Replacing the Sensor (Integrated Sensor Type)>

sensor part.

2

recessed area at the lower right
sensor cover’s latch.

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3

Remove the sensor cover.

Remove the old sensor.

Install the new sensor.

6

Put the sensor cover back on.

CAUTION

4

5

Be s ure the se nsor pins are lined up
with the board’s sockets.

• When insta lling the s ensor, be s ure the p ins are lin ed up with the sock ets before pus hing in the
sensor. Ignoring this may bend and damage the sensor pins.

• After the sensor is installed, always perform a calibration (zero adjustment and span adjustment).

• Do not dis assemble t he sensor because it c ontains elec trolyte. If contact occ urs, rinse the area

immediate ly with a large quant ity of water.

• The sensor mus t be stor ed under norm al t emper ature /hum idit y in a c lean place awa y fr om d irec t
sunlight.

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1

Remove the sensor cover of the

2

Remove the old sensor.

3

Install the new sensor.

4

Put the sensor cover back on.

2

Remove the sensor cover of the old

OX-600.

<Replacing the Sensor (Remote Sensor Type)>

sensor unit.

Push the tabs on the both sides with
your fingers to release the sensor
cover latch.

Remove the sensor cover to check
the sensor.

Be sure the sensor’s pins are lined
up with the boar d ’s sockets.

7-9. Repl acing a Sensor Cable

NOTE: The wire colors in the extender cable may vary depending on the type of cable used. The
Type A cable has red/green/white/black wires and the Type B cable has
white/yellow/white/blue wires. The pictur es in this section show the Type A cable.

Turn off or disconnect power to the

1

cable’s remote sensor housing.

Push the tabs on both sides of the sensor
cover with your fingers to release the sensor
cover latch.

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3

Remove the cable plug from the

Push the PCB retaining tabs back,

, and lift the

5

Remove the top half of the main

6

Remove the old cable’s wiring leads

7

Pull the old cable out of the housi ng.

cable socket on the sensor board.

Press the t ab on the plug to release it and
pull it away from the socket.

4

grasp the cable socket
sensor board out of the housing. Set
the sensor board aside.

unit’s housing to access the wir i ng at
the other end of the cable.

from the sensor terminal st r i p.

For each terminal strip position:

- Push the push button straight
downward using the compatible
screwdriver or equivalent to open
the spring.

- Remove the wire.

- Release the screwdriver.

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8

Route the new cable’s w ires through

around the

Connect the cable’s wires to the
sensor terminal strip. See the table

Note that the Type B cable

the cable. Tighten the zip tie to

Terminal 1

Terminal 2

Terminal 3

Terminal 4

T ype A

Red

Green

White

Black

Type B

White wire of
white/yello w pa ir

Yellow wire of
white/yello w pa ir

White wire of
white/blue p air

Blue wire of
white/blue p air

the hole in the housing to the ri ght of
the sensor terminal str ip and install a
zip tie in the case and
cable as show n in this picture but do
not tighten it yet.

9

below for the wire colors. Type A wire
colors are shown in the pictures
below.
has two pairs of wires extending from

secure the cable in place.

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10

Secure the top half of the main uni t’s
housing to the bottom half.

11

Remove the sensor cover of the new
install the sensor board. The board

Connect the new cable’s connector

13

Secure the sensor cover of the new
cable’s remote sensor housing.

cable’s remote sensor housing and
will click into place.

12

to the sensor board.

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Remove the top half of

OX-600.

7-10. Adding a Sensor Cable

NOTE: The wire colors in the extender cable may vary depending on the type of cable used. The
Type A cable has red/green/white/black wires and the Type B cable has
white/yellow/white/blue wires. The pictur es in this section show the Type A cable.

Turn off or disconnect power to the

1

2

the main unit’s housing.

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3

Remove the cable plug

release it and pull it away

Unplug the wires from
the sensor terminal

The cable connector

once the cable is

from the cable socket on
the sensor board.

Press the tab on the p lug to
from the socket.

4

strip.

For each terminal strip
position:

- Push the push
button straight
downward using the
compatible
screwdriver or
equivalent to ope n
the spring.

- Remove the wire.

- Release the
screwdriver.

with the short length of
wires will not be needed

installed.

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5

Push the PCB retaining
tabs back, grasp the

Remove the sensor

7

Install the sensor boar d.

cable socket, and lift the
sensor board out of the
housing. Set the sensor
board aside.

6

cover of the cable’s
remote sensor housing.

Push the tabs on bot h sides
of the sens or co ver with your
fingers to release t he sensor
cover latch.

The board will click i nto
place.

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8

Connect the cable’s

9

Secure the sensor cover
remote sensor housing.

Route the new cable’s wires
to the right of the sensor

connector to the sens or
board.

of the new cable’s

10

through the hole in the housing
terminal strip and inst all a zip ti e

in the case and around the cable
as shown in this picture but do
not tighten it yet.

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11

Connect the cable’s wires t o the
sensor terminal strip. See the
table below for the wire colors.

. Note that

Terminal 1

Terminal 2

Terminal 3

Terminal 4

T ype A

Red

Green

White

Black

Type B

White wire of
white/yello w pa ir

Yellow wire of
white/yello w pa ir

White wire of
white/blue p air

Blue wire of
white/blue p air

Secure the top half of
to the bottom half.

Type A wire colors are shown in
the pictures below
the Type B cable has two pairs of
wires extending from the cable.
Tighten the zip tie to secure th e
cable in place.

12

the main unit’s housing

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CAUTION

CAUTION

8

8 Storage and Disposal

8-1. Procedures to store the monitor or leave it for a

long time

The monitor must be stored under the following environmental conditions.

• In a dark plac e wi t h normal temperature and humidity and away from direct sunlight

• In a place wher e g as es, solvents, vapors, etc. are not present
Store the monitor in a shipping carton, in which the product was d el i v ere d, if possible.

Store the monitor away from dust, etc. if the shipping carton is not available.

• If the monito r operating on dr y batteries is not us ed for a long time, st ore it after removi ng the
batteries. B att ery leaks may res ul t in f ir e , injury, etc.

8-2. Procedures to relocate the monitor or use it again

When the moni tor is r elocated, refer to "H o w to Install" for reloc a ti o n s it es a nd wiring work.
The unpowere d t ime must be minimized when the monitor is relocated.
When the mon i tor is used again af ter long-term storage, perform a calibration.

• Contact RKI for information on readjustment including calibration.

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WARNING

8-3. Disposal of products

When the monitor is dis posed of, it must be tr e at e d properly as an in d ust r ia l was t e i n ac cordance with th e
local regulations, etc.
If liquid is leaked from the sensor, do not touch the liquid. The sensor must be put into a plastic bag to
prevent the liquid from leaking to the outside. If any liquid leaked from the sensor is found in the monitor
unit, turn off the pow e r an d c on tact RKI immediately.

• Do not disassemble the galvanic cell type sensor because it contains electrolyte.
Electrolyte may cause severe skin burns if it contac ts skin, and ma y cause blindnes s if i t cont acts
eyes. If electrolyte gets on clothin g, th e m aterial will discol or or det eriorate.
If contact occ ur s, r i nse the area imm edia te ly with a large quantity of water.

• Dispose of batteries in accord ance with a proce d ure specified by the local authori t y.

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Symptom/Display

Causes

Actions

The power switch is
turned off.

Provide the rated voltage.

transformer.

The main unit is not
installed properly.

Check wheth er th e m ai n u n it is pr o perly attached to
the wall-mounted unit.

Cable abnormalities
connected/short circuit)

The batteries are dead.
type

Turn off and restart the monitor.
appropriat e m easures to eliminate the noise.

The sensor is n ot
connected.

Check that the sensor is connected and the
fastened.

Errors in communication
with the unit

Make a setting of date/time. If a symptom like this is

contact RKI.

The rated volt a ge is no t
supplied to the monitor.

Check the power supply, and supply the rated
voltage.

Abnormalities of ROM,
the monitor

Drifting of sensor output

Perform the air calibration.

Disturbanc es by interference gases, such as

please contact RKI.

Perform the air calibration. In particular, the
galvanic cell type is affected by the air pressure.

9

9 Troubleshooting

This Troubleshooting section does not explain the causes of all the malfunctions which could occur on the
monitor. This simply helps to find the causes of malfunctions which frequently occur.
If the monitor shows a symptom which is not explained in this manual or still has malfunctions even though
remedial actions are taken, please contact RKI.

Turn on the power switch.

The power cannot
be turned on.

Abnormal
operations

Sensor
abnormalities
E-1

Clock
abnormalities
E-9

Abnormalities/momentary
blackout of power supply
system

(open circuit/not

*Only for the dry battery

Disturbances by sudden
surge noise, etc .

connected or improperly

Abnormalities of the clock
inside the monitor

Take measures such as checking or adding the
UPS, power supply line filter and insulation

Check the wiring of the monitor and related devices
around it.

Replace the t wo dry batteries.

If a symptom like this is observed frequently, take

connectors of the se nsor unit board ar e s ec ur e ly

Replace the sensor unit board with a new one.

observed repeatedly, the built-in clock is seemingly
malfunctioning. Thus, it must be replaced. Please

System
abnormalities
E-9 SYSTEM

The reading drops
and remains low.

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RAM or EEPRO M ins i de

Presence of interference
gas

Environmental changes

Please contact RKI.

solvents, cannot be eliminated completely. For
information on actions, such as removal filter,

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Symptom/Display

Causes

Actions

Disturbanc es by interference gases, such as

please contact RKI.

Turn off and restart the monitor.
appropriat e m easures to eliminate the noise.

When the environment (temperature, etc.) changes

them.

Deteriorated sensor
sensitivity

Improper calibration gas
concentration

Deteriorated sensor
sensitivity

An oxygen
deficienc y al ar m is
triggered even
though there are no
abnormaliti es at
the detection point.

Span adjustment
impossible

Presence of interference
gas

Disturbanc e by noise

Sudden change in the
environment

solvents, cannot be eliminated completely. For
information on actions, such as removal filter,

If a symptom like this is observed frequently, take

suddenly, the monitor cannot adjust to it and is
affected by it.
In some cases, the monitor triggers an indication
alarm.
Because the monitor cannot be used under sudden
and frequent environmental changes, the user
should take some preventive actions to eliminate

Replace the sensor with new on e.

Use the proper calibration gas.

Replace the sensor with new on e.

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Detection pr inciple

Galvanic cell ty pe

Gas to be detect ed

Oxygen

Concentration display

LCD digital display (Three-digit, seven-segment/green, orange and red backl ight)
*No backligh t during normal o peration for the dry battery type

Detection range

0 - 25 vol%

Displa y resolution

0.1 vol%

Detection method

Diffusion type or remote detection method

Alarm setpoint

19.5 vol% (first)/23.5 vol% (second) [Standard setting]

Accuracy of the

(under the same c ondi t i ons)

Within ±0.7 vol%
Response time

(under the same c ondi t i ons)

90% response: within 30 seconds
Gas alarm type

(L-H)

Gas alarm display

First: Lights up the concentration display and bac klight (orange), buzzer
Second: Lights up the concentration display and backlight (red), buzzer

Gas alarm pattern

Self-latching or non latching (Auto-reset)

Gas alarm contact

No-voltage c ontac t 1a or 1b and nor mall y de-energized (energized in response to
an alarm)

Fault alarm/self
diagnosis

System abnormalities/sensor connection abnormalities
Fault alarm display

Alarm detail display and backlight blinking (red), buzzer

Fault alarm pattern

Non latching (auto-reset)

Contact capacity

125 VAC - 1 A or 30 VDC - 1 A (Resistance load)

Transmission

4 - 20 mA DC (no-ins u l at i o n/ l oa d r esistance under 3 00 Ω) or 0 - 1 VDC

*Only 0 -1 VDC for the dry batte ry type

Cable for gas detector
head

Dedicated cable for remote (3, 5, 10 or 20 m)
Power supply

100 - 120 VAC ±10% (50/60 Hz), 24 VDC ±10% or AA alkaline dry battery (2 pcs.)

Power consumption

AC specific at io n : Max. 5 VA/DC specification: Max . 3 W

Dry battery
time

Approx. one year (25ºC, no alarm and no backlight)
Initial clear

Approx. 25 seconds

Operating
temperatures

-10 - +40ºC (at a constant condition)
Operating humidities

Below 90%RH (Non-condensing)

Structure

Wall mounting type, sensor integrated type or remote type

Outline dim ensions

Main unit: Approx. 80 (W) x 120 (H) x 35.5 (D) mm
excluded)

Weight

AC specification: Approx. 200 g/DC specification: Approx. 180 g/Dry battery type:
Remote sensor part: Approx. 55 g (cable excluded)

10

10 Product Specifications

10-1. List of specifications

reading

specifications

Continuous operating

*Some operations are different between the dry battery type and DC/AC specification.

(no-insulation)

*When using t wo AA alkaline dry batter ies

Remote sensor: Approx. 40 (W) x 96 (H) x 35.5 (D) mm (projection portions

Approx. 230 g

* Specificat ions subject to cha nges without no t ice .

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10-2. List of accessories

• 3.2 m AC power cable (1 pc.) *Supplied only with AC specification

• Cross-recessed pan head machine screw (2 pcs.)

• Cross-recessed round head wood screw (2 pcs.)

• Operating manual (1 pc.)

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Part Number

Description

06-1248RK-03

Calibration tubing, 3 foot length

21-1927

Mounting plate for instrument removal

45-0443RK

Bar terminal with red insulation, for 18 A WG

45-0444RK

Bar terminal with black insulation, for 16 AWG

45-0445RK

Bar terminal with blue insulation, for 14 AWG

45-0446RK

Bar terminal with gray insulation, for 12 AWG

46-5100RK

Lever, wiring tool

47-1556-03

Extender cable with remote box, 3 meters

47-1556-05

Extender cable with remote box, 5 meters

47-1556-10

Extender cable with remote box, 10 meters

47-1556-20

Extender cable with remote box, 20 meters

49-1120RK

AA size alkaline battery

81-0078RK-01

Calibration cylinder, 100% N2, 34 liter

81-1050RK

Regulator, fixed flow, 0.5 LPM, with gauge and knob, for 17- a nd 34-liter cylinders

81-1153

Calibration cup

81-OX600-LV

Calibration kit with calibration cup, 0.5 LPM fixed flow regulator, 100% N2 cylinder,
and calibration tubing

OS-BM1D

Oxygen sensor

11

10 Spare Parts List

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<Structure Diagram>

Barrier

Negative
Electrolyte

Output terminal

Thermister

Positive
electrod

12

11 Appendix

12-1. Detection principle of galvanic cell type

By immersing p reci ou s meta l an d le ad i n el e ctr oly te a nd con ne cti ng t he m wi th a lea d w i re, a b at te ry can be
made (galvanic cell).
When oxygen passes through the barrier, deoxidizing reaction occurs at the precious metal electrode while
oxidizing reaction occurs at the lead electrode.
The electric current genera te d by this reaction go es th r ou g h lo a d r esistance (ther mister), where i t is
converted in t o v olt a g e s o t ha t it ca n b e re ad. When the oxyge n c oncentration is decr e as e d , deoxidizing
reaction at the pr ecious metal electrode is also dec reased, thus lo wering the volta ge at bo t h en ds of th e
thermister.

Important precautions

1. The readings of the monitor fluctuate slightly in response to changes in the air pressure. In particular,
be careful of alarm activation when a low air pressure is brought in by typhoon, etc.
In addition, it may be fluctuated by environmental (temperature, humidity, etc.) changes in the
installation site.

2. The alarm must be set within a range where the performance of the monitor can be ensured. The
standard alarm setpoint values are 18 vol% for the first and 19 vol% for the second.

3. This is a safety unit. This is not a control unit.
The alarm contact output of the monitor must be used for an external alarm lamp/buzzer, while the
analog signa l o ut pu t m ust be used for an indic ator or external rec o r d er. If these o ut pu ts are us e d to
control other units, we shall not be responsible for any malfunctions.

4. For maintenance of the monitor , it must go through a regular maintenance, including replacement and
adjustment of the regular replacement parts as specified in the operating man ua l . In ad d it i on , because
this is a safety unit, i t is recommended that a r eg u lar maintenance and spa n adjustment are perf or med
every six months.

electrode

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vol%

Gas concentration indicated in the unit of one-hundredth of the volume

Calibration

Find relationship of the readings, display values or setpoints with the actual values
by using the calibration gas.

Maintenance

When mainte na nce is perform ed o n th e m on i to r, the alarm cont act is disconnect ed,

monitor.

Initial clear

The reading is uns t ab l e for seconds after t he po wer is turned on. To prevent
indicate the i ni t ia l cl ea r st at us is s en t o ut to the external ou tp ut .

Zero
suppression

A function to cut off the influe nc es of environm ent a l c ha n ges, interference gases,
etc.

Alarm delay time

A function which temporarily suspends activation to prevent a false alarm caused by
noise from its outside.

12-2. Definition of terms

mode

and a signal to indicate the maintenance mode status is sent out to the external
output signal. As a result, maintenance can be performed on a single unit of the

malfunctions for that period, the alarm contact is deactivated. In addition, a signal to

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