Riken Keiki GD-K71D User manual

PT2E-1057
OPERATING MANUAL
FOR
INTELLIGENT GAS DETECTOR
GD-K71D

1
INDEX
１．PRODUCT OUTLINE
１－１． Preface ……………………………………………………………………… 3
１－２． Application for use ………………………………………………………… 3
１－３． Identification of each signal word ………………………………………… 3
２．IMPORTANT INSTRUCTION FOR THE SAFETY
２－１． Danｇer items………………………………………………………………… 4
２－２． Warning items………………………………………………………………… 4
２－３． Caution items………………………………………………………………… 5
３．PRODUCT FUNCTION
３－１． External drawing……………………………………………………………… 6
３－２． Product composition
３－２－１ Major components…………………………………………………… 7
３－２－２ Unit detaching ……………………………………………………… 8
３－３． Installation pitch …………………………………………………………… 9
３－４． Name of each part and functions
３－４－１ Front view …………………………………………………………… 10
３－４－２ Inside view …………………………………………………………… 11
３－５． Block diagram
３－５－１ Electric diagram …………………………………………………… 12
３－５－２ Tubing diagram……………………………………………………… 12
４．HOW TO USE
４－１． Before operation……………………………………………………………… 13
４－２． Installation place …………………………………………………………… 13
４－３． Caution in the system engineering ………………………………………… 14
４－４． Grounding …………………………………………………………………… 17
４－５． Caution at wiring construction …………………………………………… 18
４－６． Applicable cable
４－６－１ Power/signal cable ………………………………………………… 18
４－６－２ Relay output signal cable …………………………………………… 18
４－６－３ Specifications of terminal…………………………………………… 18
４－６－４ Terminal plate ……………………………………………………… 19
４－７． Example of cable connection
４－７－１ Connection with indicator/alarm unit(EC-573A, EC-583)………… 19
４－７－２ Connection with indicator unit, DCS,PLC ………………………… 19
４－８． Cautions at piping construction …………………………………………… 20
５．OPERATION METHOD
５－１． Preparation before start up ……………………………………………… 21
５－２． Basic performance flow……………………………………………………… 21
５－３． Start up method
５－３－１． Power on …………………………………………………………… 22
５－３－２． Flowmonitor(Sensor flow) adjustment …………………………… 22
５－４． Explanation of performance (Detection mode)
５－４－１． Display action …………………………………………………… 23
５－４－２． External output action …………………………………………… 25

2
５－５． Maintenance and adjustment
５－５－１． Maintenance mode………………………………………………… 26
５－５－２． Zero adjustment…………………………………………………… 27
５－５－３． Confirmation of alarm level ……………………………………… 28
５－５－４． Alarm test ………………………………………………………… 29
５－６． How to finish operation……………………………………………………… 30
６．KINDS OF ALARM AND ITS FUNCTION
６－１． Kinds of alarms …………………………………………………………… 31
６－２． Gas alarm
６－２－１． Gas alarm action ………………………………………………… 31
６－２－２． Counteraction at gas alarm ……………………………………… 32
６－２－３． Gas alarm possibility except the case of gas detection………… 32
７．MAINTENANCE CHECK
７－１． Frequency of maintenance and check items
７－１－１． Daily check………………………………………………………… 33
７－１－２． Regular maintenance check ……………………………………… 33
７－１－３． Maintenance contract for regular check ………………………… 33
７－２． Calibration method (Calibration with gas etc.)……………………………… 34
７－３． Replacement of sensor and parts …………………………………………… 34
７－４． Treatment when operation is stopped or its installation place is moved
７－４－１． Stopping the normal operation…………………………………… 34
７－４－２． Installation when move its place ………………………………… 34
７－５． Storage or treatment when not in use for a long time …………………… 34
７－６． List of recommendable spare parts for regular maintenance……………… 35
８．TREATMENT AT ABNORMAL CASE
８－１． Trouble alarm………………………………………………………………… 36
８－２． Counteraction at trouble alarm……………………………………………… 36
８－３． Before it is thought to be a trouble………………………………………… 36
８－４． Trouble shooting……………………………………………………………… 37
９．DEFINITION OF TERMS ………………………………………………… 39
１０．DETECTION PRINCIPLE ……………………………………………… 41
１１．LIST OF PRODUCT SPECIFICATIONS
１１－１． Specifications …………………………………………………………… 42
１１－２． Product composition …………………………………………………… 43

3
１．PRODUCT OUTLINE
１－１．Preface
First of all, we wish to express our heartfelt thanks for your purchase of our intelligent gas
detector GD-K71D.
This manual is just a guide book to operate our gas detector GD-K71D.
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 a fixed type toxic gas detector to be used in semiconductor manufacturing factories,
etc. Toxic gas leaked into ambient air is sampled with internal pump and is detected with
electrochemical sensor. Detection results (Gas concentrations) are displayed with 4-digit LED
indicator.
The GD-K71D transmits gas concentration signals with 4～20mADC to upper system.
This detector provides 2 relay outputs for outer gas alarm.
１－３． Identification of each signal word
Indicates an imminently hazardous situation which, if not avoided, will
result in death or serious injury or serious damage to the product.
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 on the human body or object.
Indicates a potentially hazardous situation which, if not avoided, may
result in minor or moderate injury or some damage on the human body
or objects. It may also be used to alert against unsafe practices.
This means “ADVICE” at operation.
DANGER
WARNING
CAUTION
* NOTE

4
２．IMPORTANT INSTRUCTION FOR THE SAFETY
２－１．Danger items
２－２．Warning items
○ Power source
Before turning the power on, check that the supplied voltage is within the specified voltage.
Then, turn the power on
.
○ Necessity of grounding
Do not cut the wire for protective ground both inside and outside of instrument. Or, do not
disconnect the connection of the ground terminals.
○ Defect of protective function
Before starting the operation, check if any defect is not found on the protective grounding.
If there is any defect on the protective functions such as protective grounding or fuse, do
not start the operation.
○ Fuse
To protect the instrument from fire, use the specifically rated fuse. When replacing the
fuse, turn off the power inside of the panel, and the power source as well. Do not use
fuse that is not specified, or do not make a short-circuit inside of the fuse holder.
○ Operation in gas
Do not operate the instrument in an atmosphere of combustible gases, explosive gases
or steam. It is very dangerous to operate the instrument under such circumstances.
○ External connections
After making the protective grounding, start connecting the instrument to detecting object
and other external control circuit.
○ Treatment of lithium battery
Do not recharge, disassemble, heating above 100℃ or burn the battery since it would ignite,
explode or start to burn.
○ Treatment of sensor
Do not disassemble the sensor, since there is an electrolyte inside.
If your finger touches the electrolyte, wash your finger with water immediately.
WARNING
This is not an explosion proof detector.
Never to detect high concentration gas beyond their lower explosive limit.
DANGER

5
２－３．Caution items
○ Do not use a walky-talky around the instrument.
The indication might be affected by the electromagnetic wave generated by the
walky-talky if it is used near the instrument. When the walky-talky is used, be away
enough from the instrument not to affect.
○ Take at least 5 seconds interval when re-turning the power on.
Normal operation cannot be performed if the power is re-turned on within 5 seconds.
○ Confirm the float of the flowmonitor is within two red bars.
If the float gets below the lower red bar, the correct gas detection cannot be
performed. Adjust the flow rate.
○ Equip a dust filter to the outside of the detector if it is used in a dusty place.
The dust filter depends on a measuring gas. Consult our sales agents.
○ Take care not to drop the cover when taking it out.
Dropping the cover might cause a serious injure. Take care.
○ Do not control other equipment by using outputs of this detector.
This is not a control equipment. It is prohibited to control other equipment by using
outputs of this detector.
CAUTION
○ Treatment at gas alarming
It is very dangerous if the instrument detects the gas exceeded the alarm points.
Take any treatment based on your judgment at that time.
WARNING

9
３－３．Installation pitch
Keep the space of this oblique part as the installation space.
（１）Install the wall mounting bracket on the wall.
（２）Put the detector unit on the wall mounting bracket.
Confirm that the detector unit is surely fixed to the wall mounting bracket after
finishing the job.
If it is not surely fixed, the detector unit might drop and cause injury or damage itself.
CAUTION
！
Fig. 1: Dimension of mounting pitch
Wall

13
Do not install it where it is attended with danger at maintenance work.
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．Installation place
・Use the designated dust filter to avoid adsorption of gas or influence caused by ambient dust.
・Stop the suction pump before replacing filter.
・Put the designated dust filter at the inlet of sample tubing if it is used other than clean room.
Keep away the system from direct sun drought or where the temperature of the
system is drastically changed.
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.
・In this case, extend the length of sampling hose etc. and sample the gas.
This detector requires regular maintenance.
Do not install the detector where it is attended with danger at maintenance work.
Do not install at places where direct sun drought or where the temperature is
drasticall
y
chan
g
ed.
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
g
as is de
p
osited around.
CAUTION
Detection
g
as sam
p
lin
g
from hi
g
h dust
y
p
laces.

14
Do not install the detector at places where;
* It is required to stop operation of the equipment where gas detector is installed at
maintenance work.
* It cannot make maintenance without taking off a part of equipment.
* Casing cannot be removed by pipings, rack, etc.
Be sure to ground when install.
４－３．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 10msec.
（For power failure of 10msec, it re-starts）
To warrant the continuous operation, install the standby battery
outside.
Others
Do not contact with power involving 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.
Do not install it in an equipment that grounding construction is not enough.
CAUTION
Do not install it where it is difficult to make maintenance

15
（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.
Please contact with the manufacturer of lightning arrestor in
details.
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.
（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 contact.
・Make relay(contact amplification) with 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.
CAUTION
（FOR USE OF NORMALLY-CLOSED CONTACT）
Normally-closed contact (Break contact) at de-energized 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.

16
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
C L
SK O SK O
I R
L D
Ｖ Ｖ
Alarm contact
Power supply Relayed relay Power supply
(Low voltage relay)
ＧＤ－Ｋ７１Ｄ
－How to think alarm contacts against inductive load－
The spec for alarm contact of GD-K71D 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 not work.
・High voltage is put inside of detector 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
* As the inductive load, there are following samples.
Revolving light, External relay, Buzzer, Siren, Fan, Fluorescent lamp, Motor etc.
CAUTION
・The inductive load shall not be used in principle (Do not use fluorescent lamp,
motor, etc.).
・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.

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４－５．Caution at wiring construction
４－６．Applicable cable
４－６－１．Ｐｏｗｅｒ/Signal cable
[3-wire 4～20mA version]
Power & signal cable : Use CVVS 1.25sq. 3-core cable
[4-wire 4～20mA version]
Power cable : Use CVV 1.25sq, 2-core cable
Signal : Use CVVS 1.25sq, 2-core cable
４－６－２．Relay output signal cable
Relay contact cable : Use VCTF 0.75sq., 6-core cable
４－６－３．Specifications of terminal
Terminal specifications
●Rated voltage : AC250V
●Rated current : 13A
Connectable conditions
●Cable : 0.14mm2～1.5mm2
●Length of naked wires : Approx 6mm
●Screw clamp torque : 5～8kg.
●Applicable screw driver : Minus screw driver (width below 3mm)
When use the bar terminal, the following can be used.
Bar terminal : Model AI series(Phoenix contact make)
Terminal lug tool : Model CRIMPFOX UD 6(Phoenix contact make)
CAUTION
Be sure to use the exclusive bar terminal. When used with other make bar terminal
than above, the function of this detector can not be warranted.
CAUTION
・When make wiring construction, take care not to damage the internal electronics circuit.
・When handle the detector unit, put in at horizontal position. If put it vertically, it tends
to fall back and damage the detector.
・For power cable, and signal cable, they should not be laid out with motive power cable
such as motor etc.
・When use twisted cable, take care not to contact a part of core cable with other core
cable.
CAUTION
Size of leading cable to GD-K71D is up to 1.25sq.
When use the cable exceeding 1.25sq., use the junction box etc.

19
③
⑤
④
⑥
＋２４V
GND
Sig
４－６－４．Terminal plate
１ ２ ３ ４ ５ ６ ７ ８ ９ 10 11 12
４－７．Example of cable connection
４－７－１．Connection with indicator/alarm unit
(EC-583, EC-573A): (3-wire type)
Short circuit
４－７－２．Connection with indicator unit, DCS, PLC
(4-wire type)
Trouble contact
ALM２ contact
ALM１ contact
4～20mA
＋ ― ＋
・ EC-583
・ EC-573A
DC24V
＊NOTE
Terminals 4 & 5 are
not in use.
23
4 5 E
GD-K71D
Detector
E
1 23 4
5 6 E
E
ＤＣ２４Ｖ
(+) (-)
GND
Sig
・ Indicator (RM-582,etc.)
・ Upper system(DCS, PLC)
GD-K71D
Detector
16
＊NOTE
In case of 4-wire type, power supply unit (DC24V) is required separately.
―