Riken Keiki OX-592 Instruction Manual

PT1E-0947
FOR USERS
OPERATING INSTRUCTION MANUAL
FOR
INDICATOR/ALARM UNIT OX-592

1
CONTENTS
１．PRODUCT OUTLINE
1-1 In the beginning･･･････････････････････････････････････････････････････ 3
1-2 Application for use･････････････････････････････････････････････････ 3
1-3 Identification of each caution marks････････････････････････････････････ 3
1-4 Method of confirmation for CE marking type････････････････････････････････ 4
２．IMPORTANT INSTRUCTION FOR THE SAFETY
2-1 Danger items･････････････････････････････････････････････････････ 5
2-2 System composition･･････････････････････････････････････････････････････ 5
2-3 Caution items･･････････････････････････････････････････････････････ 6
３．PRODUCT FUNCTION
3-1 External drawing(with single case)･･･････････････････････････････････････ 7
3-2 Appearance(with single case)･････････････････････････････････････････････ 7
3-3 Panel cut-out dimensions･････････････････････････････････････････････････ 8
3-4 Name of each part and function･･･････････････････････････････････････････ 9
3-5 Block diagram････････････････････････････････････････････････････････････ 10
４．HOW TO USE
4-1 Before operation･･････････････････････････････････････････････････････11
4-2 Mounting/dismounting procedures････････････････････････････････････････11
4-3 Installation place･････････････････････････････････････････････････････････12
4-4 Caution in the system engineering･････････････････････････････････････････13
4-5 Grounding･･････････････････････････････････････････････････････････････15
4-6 Wiring･･･････････････････････････････････････････････････････････････････16
５．OPERATION METHOD
5-1 Preparation for Start up･･･････････････････････････････････････････････････17
5-2 Basic performance flow････････････････････････････････････････････････････17
5-3 Start-up method･････････････････････････････････････････････････････････18
5-3-1 Power on･･･････････････････････････････････････････････････････････18
5-4 Explanation of performance (Detection mode)･･････････････････････････････19
5-4-1 Display action･･････････････････････････････････････････････････････19
5-4-2 External output action･･･････････････････････････････････････････････20
5-5 Maintenance and adjustment･･････････････････････････････････････････････21
5-5-1 Maintenance mode･･････････････････････････････････････････････････21
5-5-2 Adjustments･･････････････････････････････････････････････････････22
5-5-2-1 Span adjustment(For prevention of oxygen deficiency)･････････････22
5-5-2-2 Zero adjustment(For general detection)･･･････････････････････････23
5-5-3 Confirmation of alarm level･･････････････････････････････････････････24
5-5-4 Change of alarm level･･･････････････････････････････････････････････24
5-5-5 Confirmation of peak hold level･･････････････････････････････････････25
5-5-6 Alarm test･････････････････････････････････････････････････････････26
5-6 How to finish operation･･････････････････････････････････････････････････26

2
６．KIND OF ALARM AND ITS FUNCTION
6-1 Kind of alarm･･･････････････････････････････････････････････････････････27
6-2 Gas alarm････････････････････････････････････････････････････････････････27
6-2-1 Gas alarm action･･･････････････････････････････････････････････････27
6-2-2 Counteraction at gas alarm････････････････････････････････････････28
6-2-3 Gas alarm possibility except the case of gas detection･･････････････････28
７．MAINTENANCE AND CHECK
7-1 Frequency of maintenance and check items･･･････････････････････････････29
7-1-1 Daily check･････････････････････････････････････････････････････29
7-1-2 Regular maintenance check･･･････････････････････････････････････29
7-2 Maintenance contract for regular check･･･････････････････････････････････29
7-3 Replacement of sensor parts･････････････････････････････････････････････30
7-4 Treatment when operation is stopped or its installation place is moved･･････30
7-4-1 Stop at normal operation･･････････････････････････････････････････････30
7-4-2 Installation when move its place･･･････････････････････････････････30
7-5 Storage and treatment when not use for a long time･･･････････････････････30
８．SCRAP OF PRODUCT AND SENSOR･････････････････････････････････････････30
９．MEASURES AT ABNORMAL CASE
9-1 Trouble alarm････････････････････････････････････････････････････････････31
9-2 Counteraction at trouble alarm････････････････････････････････････････････31
9-3 Before it is thought to be trouble･･････････････････････････････････････････31
9-4 Trouble shooting･････････････････････････････････････････････････････････31
10．DEFINITION OF TERMS･････････････････････････････････････････････････････33
11．PRODUCT SPECIFICATIONS
11-1 Specifications･･･････････････････････････････････････････････････････34
11-2 Product composition･･･････････････････････････････････････････････････34

3
１．PRODUCT OUTLINE
１－１．In the beginning
First of all, we wish to express our heartfelt thanks for your purchase of our indicator/alarm unit OX-592.
This instruction manual is just a guide book to operate indicator/alarm unit OX-592 of RM-590 series.
Your kind reading of this manual is requested not only for first user but for already experienced staff.
１－２．Application for use
○ This is an exclusive indicator/alarm unit to be used in combination with our oxygen detector head to
indicate oxygen concentration for the control of oxygen deficiency prevention, etc.
○ Oxygen is detected with a galvanic cell type oxygen detector head which is connected with this
indicator/alarm unit. Detection results are displayed with 4-digit LED indicator.
Spec.
Application Detection range Action 1st alarm 2nd Alarm
Prevention of
oxygen deficiency 0 ～ 25vol% Lo-LoLo alarm Lo Lo
General detection
(Including
oxygen leakage)
0 ～ 5vol%
0 ～ 10vol%
0 ～ 25vol%
Hi-HiHi alarm Hi Hi
Lo-Hi alarm Lo Hi
0 ～ 50vol% Lo-LoLo alarm Lo Lo
Take care that an alarm action and a relay output are different from application for use.
This operating instruction manual describes on the application for prevention of oxygen deficiency.
１－３．Identification of each caution marks
Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury. This signal word is to be limited to the most extreme
situation.
Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury. It may also be used to alert against unsafe practices.
This means “ADVICE” at operation.
＊ NOTE
DANGER
WARNING
CAUTION

6
２－３．Caution items
・ Do not use walky-talky, mobile phone, etc. near this unit.
When this unit receives the electric waves by walky-talky etc near from the cable, this will effect
the reading. When use the walky-talky, operate it at the place where there is no influence of
electric wave emission.
・ When make power on again, make it after an interval of over 5 seconds.
When make power on within 5 seconds, there may be no normal operation.
・ When operate it not to follow this manual, repair it by other rating parts or modify it on his own,
the safety and quality of products cannot be secured. Then, when an accident take place by it,
we cannot assure our responsibility on them.
Take enough consideration for instrumentation to keep safety even if disconnection of power
and signal lines, defect of operation or trouble would be happen due to unexpected reason.
This is an electrical applied instrument.
Be care it may be effected by power noise, electrostatic and electromagnetic noise.
When use under such conditions, make protective treatment for use.
CAUTION

9
３－４．Name of each part and function
*The below pictures show indicator/alarm unit with single case.
①LED display・・・・・・・・・・・・・・・・・・・・・・・ Indicates gas concentration.
②POWER switch・・・・・・・・・・・・・・・・・・・・ ON/OFF switch
③Terminal plates・・・・・・・・・・・・・・・・・・・・ Connects cables from outside.
For multi-unit case refer to instruction manual for multi-unit case.
④PW/TR light・・・・・・・・・・・・・・・・・・・・・・ Combination light for power and trouble indication.
Steady light : Power ON, normal operation
Flashing : Trouble
⑤AL1 light・・・・・・・・・・・・・・・・・・・・・・・・・ Flashes at gas alarm (1st alarm)
⑥AL2 light・・・・・・・・・・・・・・・・・・・・・・・・・ Flashes at gas alarm (2nd alarm)
⑦SKIP light・・・・・・・・・・・・・・・・・・・・・・・・ Flashes during maintenance mode.
⑧MODE switch・・・・・・・・・・・・・・・・・・・・・ Uses at maintenance work.
⑨UP/DOWN switch・・・・・・・・・・・・・・・・・ Uses to select items at maintenance mode, increase or decrease
reading at zero and span adjustments, and to increase or decrease
reading at alarm test.
⑩ SET switch・・・・・・・・・・・・・・・・・・・・・・ Uses to change for alarm test mode.
⑪ Disengagement lever・・・・・・・・・・・・・・ Locks the indicator/alarm unit.
②
④
⑤
⑥
⑦
⑧
⑨
⑩
① ③
⑪

10
３－５．Block diagram
Detector head (Sensor)
Amp part
Control part
Display part
（ＰＷ／ＴＲ）(ＳＫＩＰ)（ＡＬ１） （ＡＬ２）
Operation part
（ＭＯＤＥ） （ＵＰ） （ＤＯＷＮ） （ＳＥＴ）
POWER INPUT
(DC24V)
Power supply part
Gas alarm contact （AL1、AL2）
Trouble alarm contact
(TROUBLE)
※Standard setting
・Non-exciting
（Non-exciting at normal）
・a-contact
(Contact closes at alarm)
Alarm contact control part
OX-592
4-20mA
transmission
Transmission part

11
４．HOW TO USE
４－１．Before operation
Be sure to keep caution items of use not only for first user but for already experienced staff.
If not keep these caution items, the unit may be defective and correct gas detection may not be performed.
４－２．Mounting/dismounting procedures
Indicator/alarm unit for RM-590 series shall be used after housing it in either exclusive single case or
multi-unit case.
(1) Mounting method
・Open the front cover of this unit.
・Confirm that the power switch is at OFF.
・With the disengagement lever at down position, mount into the case.
（Confirm that the edge connector is put in firmly）
・Confirm that the disengagement lever is turned upward when indicator/alarm unit is mounted into the
case firmly.
・After confirmation of lever position, put ON the power switch, and then, close the cover.
(2) Removal of the unit
・Open the front cover of this unit.
・Confirm that the power switch is at OFF.
・Push disengagement lever down to release the lock.
・Pull out the unit from the case.
・Turn the lever upward and close the cover.
Mounting/dismounting of indicator/alarm unit shall be done according to
the above procedures. If not, stopping metal of the unit may be
transformed and the cover can not be closed.
CAUTION

12
４－３．Installation place
Keep away the system from direct sun drought or where the temperature of the system is
drastically changed. If installed, inside the unit will be built up condensation and does not follow
the drastic temperature change.
The system consists of fine electronics parts.
Install them where to be stable not to crush or fall down.
Keep the system from the equipment which may give a high frequency in the surroundings and install
it.
・Do not put the system jointly each.
・Do not wire the cable in parallel nor take access.
Do not install and make gas detection at the place where the sample gas is deposited.
This unit is required to make maintenance regularly.
Then, do not install at the place where there is danger at maintenance time.
When required to stop the system at maintenance time, unable to maintain if not remove a part of
system or unable to detach the case due to the pipe or rack etc. do not install such place.
Be sure to ground when installing to the equipment.
Do not install at places where direct sun drought or where the temperature is drastically changed.
Do not install it where vibration or shocks may take place.
Keep the system from the equipment which may generate the noise (Unit & cable).
Do not install it where the detection gas is deposited around.
Do not install at the place where it is danger for maintenance service such as high voltage cable,
etc.
Do not install it where it is unable to make maintenance.
Equipment housing that grounding construction is not enough.
CAUTION

13
４－４．Caution in the system engineering
Unstable power and noise may cause error of performance and alarm.
For the system to use this unit, it is required to make design based on this
manual descriptions.
(1) Stable power used
While the system gets stable at power failure, the external output and alarm contact may be on and the
care for it must be taken. In such case, use the standby battery or take an appropriate action in the
receiver side. Supply the following power to this unit.
Power voltage DC24V±10％
Power failure
tolerance time
Approx 50msec.
（For power failure of 50msec, it re-starts）
To warrant the continuous operation, install the UPS
(Uninterrupted Power Supply) or standby battery outside.
Others
Do not share the power involving with high power load
and high frequency noise.
According to requirement, use line filter and separate it
from noise source.
(2) Designing to consider radiation
When install the closed self-standing control panel, mount the fans in the upper and lower part.
(3) Lightning measures
Lightning
surge
There is the problem “Lightning”. When make outdoor wiring of cable at factory or plants etc or
when make a parallel wiring in the same duct with the cable in from outdoor even at the indoor
wiring. If the lightning is a huge generation source, the cable is a reception antenna and there is
the case that cable connecting instrument is broken. It is impossible to prevent the generation of
lightning. If the cable should put in metal tube or laid in the underground, it is impossible to
prevent the inductive lightning surge generating from the thunder.
Lightning
measures
There is not the complete countermeasure for it but the following method can be considered.
Make the suitable treatment accordingly.
a) The transmission signal route is arranged for connection by the optical fiber cable etc.
b) Countermeasure by the lightning arrester (Cable safety retainer). There is the way to install
the lightning arrester just before the field apparatus and the central control station. The
position of the lightning arrester installation is at each point of cable laid out from the outdoor
to the indoor. The lightning arrester builds in the circuit to remove the surge voltage to be
the source for the damage of field apparatus (Protection resistor, zero diode etc.) and is
designed to protect the apparatus. But as the signal may be attenuated due to the lightning
arrester, check the action and it is required to use.
Grounding Surge noise shall be generated from the thunder lightning or except it.
To protect detector from these cause, be sure to make grounding.
＊In the lightning rod, there is the circuit to remove the surge voltage to be a cause of damage from field
instruments.
By installing the lightning rod, the signal may be attenuated. When install the lightning rod, it is required to
check the performance in advance.
CAUTION

14
(4) Alarm contact
・Alarm contacts shall be used only for external buzzer and alarm light, and do not use it for the controlling
use (such as solenoid valve control etc).
When control the external load, the bad influence may be given to the system according to the load
characteristics. In such case, the following countermeasure shall be taken to stabilize the action and
protect the contents.
・Relayed by the low voltage relay and operate by connecting CR circuit (Spark Killer: SK) (Diode etc for
DC) suited for relay coil directly to relay.
・Add CR circuit to the load side of relay on the request.
Reference : By the condition of load, CR circuit may be better to install in the contact side but it is required
to put in by checking the action of load.
ＳＫ：Surge absorption filter
－How to think alarm contacts against inductive load－
The spec for alarm contact of OX-592 is described by the conditions of resistive load.
When use the inductive load for alarm contacts, the very high reverse electromotive voltage may be
generated and the following trouble tends to be produced.
・Contact part of relay is melted adhesively and the contacts can no work.
・High voltage is put inside of indicator/alarm unit and then, electrical parts may be damaged.
・As it is big noise, the trouble action may be taken by the reckless drive of CPU.
・Irrespective of inductive load, there is the possibility of unforeseeable noise instruction for contact.
Above trouble may be generated.
Ｖ
SK
L
o
a
d
Ｖ
SK
C
o
i
l
Power supply
Power supply
Relay
(Low pressure relay)
Alarm
contact
ＯＸ－５９２
CAUTION （FOR USE OF NORMALLY-CLOSED CONTACT）
Normally-closed contact (Break contact) at non-existing condition may change to open contact in a
moment due to physical shock.
Whenever alarm signals from gas detectors are used with normally-closed contact, please put
delayed-circuit (for about one second) to receiver side of normally-closed contact to avoid such
phenomenon.

15
※ As the inductive load, there are following samples.
・Revolving light * External relay * Buzzer *Siren *Fan *Fluorescent lamp * Motor etc.
４－５．Grounding
Make grounding with terminal .
Be sure to make grounding before putting power ON.
Be sure to make grounding for safety purpose and to keep stable operation of this unit.
Do not connect earth wire with gas pipe. Make grounding corresponding to D-class
grounding (Grounding resistance : below 100ohms).
WARNING
Terminal
CAUTION
・The inductive load shall not be used in principle (Do not use fluorescent lamp).
・When use the inductive load, make the contact amplification outside, but the outside relay coil
belong, use the relay driven by the low voltage (within AC100V) and it is protected by an
appropriate surge killer.

16
４－６．Wiring
（In case of single case）
ＴＤ１
ＴＤ２
ＴＤ３
ＴＤ４
Maximum cable length：1.25km
For multi-unit case, refer to operating instruction for multi-unit case.
Detector Head
TR : Common trouble alarm contact
Earth terminal
CAUTION
・Use CVVS 1.25sq cable for the connection of detector head.
・Do not distribute power cable and signal cable together with power line for motor, etc.
・This unit applies a connector type terminal plate for easy wiring. Be care not to give a high load to
the connector.
・We can not warrant the performance of this unit if undesignated cable is used.
①
②
③
④
①
②
③
④
DC24V±10％
①
②
③
④
①
②
③
④
AL1 : 1st alarm contact output
AL2 : 2nd alarm contact output
4-20mA output
GND(-)
24V(+)
＋
－
CVVS 1.25sq-2c
Note 1
Note 1: When low flow alarm signal is
used individually, disconnect
short-circuit bar between
terminal No.1 and 2 of TD2 and
connect signal cable for low flow
alarm.
3
4
5(+)
6(-)
(+)
(-)

17
５．OPERATION METHOD
５－１．Preparation for start-up
●Before putting power ON……………
Before putting power ON, keep following caution items. If not, danger for electric shock or damage to
the unit will be happen.
(1) Make grounding.
(2) Check that wirings with outer units are made correctly.
(3) Check that the supply voltage is within a rating.
(4) Relay contact for outer alarm may work during adjustments. Even relay contact works, treat that
any influence will not be given to the outer.
(5) To prevent fire, check that the designated fuse is used.
５－２．Basic performance flow
In normal operation, it is used on detection mode.
Power on
Stand-by
Initial clear (approx. 25sec.)
Detection mode Alarm test mode
SET switch (Press for about 3 sec.)
ＭＯＤＥ switch (Press for about 3 sec.)
Maintenance mode
・Change of alarm levels（ＡＬ１, ＡＬ２）
・Zero adjustment
・Span adjustment
CAUTION
Maintenance mode shall be performed by the specialized service man. Do not operate it
without permission.

18
５－３．Start-up method
５－３－１．Power on
1) Before making power on, check that the unit is connected correctly.
2) The power switch can be seen when the front cover is opened.
3) Put the power switch upward to ON and downward to OFF.
4) Put the power switch on, and power light illuminates.
5) Status of initial clear (about 25 sec.) is displayed as “- - - - “.
・ Checking of the system (Self-diagnosis)
・ Output signal : Approx 17.4mA(In case of 0-25% range for oxygen deficiency detection)
・ Gas alarm, trouble alarm (light, contact) shut-off.
Cover
Power switch