Riken Keiki TP-70DGII User manual

PT5E-0581
Gas Detector
TP-70DGII
Operating Manual

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Contents
1. Outline of the Product.....................................................................................................................................2
1-1. Preface ...................................................................................................................................................2
1-2. Purpose of use .......................................................................................................................................2
1-3. Definition of DANGER, WARNING, CAUTION and NOTE ....................................................................2
1-4. Method of confirmation for CE marking type..........................................................................................3
2. Important Notices on Safety ...........................................................................................................................4
2-1. Danger cases .........................................................................................................................................4
2-2. Warning cases........................................................................................................................................4
2-3. Precautions ............................................................................................................................................6
3. Product Components......................................................................................................................................7
3-1. Main unit and standard accessories.......................................................................................................7
3-2. Outline drawing ......................................................................................................................................8
3-3. Names and functions for each part ........................................................................................................8
3-4. Block diagram.......................................................................................................................................13
4. How to Use ...................................................................................................................................................15
4-1. Before using the gas detector ..............................................................................................................15
4-2. Precautions for installation sites...........................................................................................................15
4-3. Precautions for system designing ........................................................................................................17
4-4. How to wire...........................................................................................................................................19
4-5. How to Tube .........................................................................................................................................23
5. How to Operate.............................................................................................................................................24
5-1. Preparation for start-up ........................................................................................................................24
5-2. Basic operating procedures .................................................................................................................25
5-3. How to activate the gas detector..........................................................................................................25
5-4. Modes...................................................................................................................................................28
5-5. Detection mode ....................................................................................................................................29
5-6. Alarm test mode ...................................................................................................................................30
5-7. User mode............................................................................................................................................31
5-8. How to exit............................................................................................................................................35
6. Operations and Functions ............................................................................................................................36
6-1. Gas alarm activation.............................................................................................................................36
6-2. Fault alarm activation ...........................................................................................................................38
6-3. External output operation .....................................................................................................................39
6-4. Other functions .....................................................................................................................................41
7. Maintenance .................................................................................................................................................44
7-1. Maintenance intervals and items..........................................................................................................44
7-2. Regular maintenance mode .................................................................................................................46
7-3. Calibration method ...............................................................................................................................65
7-4. Other adjustments/cleaning method ....................................................................................................68
7-5. How to replace parts ............................................................................................................................69
8. Storage, Relocation and Disposal ................................................................................................................71
8-1. Procedures to store the gas detector or leave it for a long time ..........................................................71
8-2. Procedures to relocate the gas detector or use it again ......................................................................71
8-3. Disposal of products.............................................................................................................................72
9. Troubleshooting ............................................................................................................................................73
10. Product Specifications ................................................................................................................................77
10-1. List of specifications ...........................................................................................................................77
10-2. List of accessories..............................................................................................................................78
10-3. Detection principle..............................................................................................................................79
11. Definition of Terms ......................................................................................................................................81

1. Outline of the Product 1-1. Preface
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1
1. Outline of the Product
1-1. Preface
Thank you for choosing our gas detector TP-70DGII. Please check that the model number of the product
you purchased is included in the specifications on this manual.
Non-compliance with safety precautions in use of electrical products may lead to fire or bodily injury.
This manual explains how to use the gas detector and its specifications. It contains information required for
using the gas detector properly. Not only the first-time users but also the users who have already used the
product must read and understand the operating manual to enhance the knowledge and experience before
using the gas detector.
1-2. Purpose of use
This is a fixed type gas detector which detects leak of gases used in semiconductor factories, etc.
The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases. Please fully understand the features of the gas detector before using it,
so that it can be used properly.
The gas detector detects abnormalities in the air caused by presence of gases or other reasons (leak)
with the built-in gas sensor unit. The concentrations of detected gases are displayed on the character
LCD.
The built-in pump in the gas detector draws gas to perform gas detection.
The gas detector head has two-step gas alarm contact and fault alarm contact.
The gas detector outputs gas concentration in 4 - 20 mA or digital data (Ethernet).
1-3. Definition of DANGER, WARNING, CAUTION and
NOTE
DANGER This message indicates that improper handling may cause serious damage on
life, health or assets.
WARNING This message indicates that improper handling may cause serious damage on
health or assets.
CAUTION This message indicates that improper handling may cause minor damage on
health or assets.
NOTE This message indicates advice on handling.

1. Outline of the Product 1-4. Method of confirmation for CE marking type
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1-4. Method of confirmation for CE marking type
The CE marking is labeled on the detector in case of comply with CE marking. Please confirm the
instrument specification before using. Please refer Declaration of Conformity that is at the end of this
manual if you have CE marking type.
You can confirm instrument specification to see the CE marking as follows.
CE marking label (Back of front cover)
CE Marking

2. Important Notices on Safety 2-1. Danger cases
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2
2. Important Notices on
Safety
2-1. Danger cases
2-2. Warning cases
DANGER
This is not an explosion-proof unit. Do not use the unit in place where combustible gases may exist.
WARNING
Power supply
Before turning on the gas detector, always check that the voltage is properly applied. Do not use an
unstable power supply because it may cause malfunctions.
Need of grounding circuit
Do not cut the grounding circuit or disconnect the wire from the grounding terminal.
Defects in protective functions
Before starting the gas detector, check the protective functions for defects. When seeming defects are
found in the protective functions, such as protective grounding, do not start the gas detector.
External connection
Before connecting the gas detector to a detection target or external control circuit, securely connect it to
a protective grounding circuit.
Tube
The gas detector is designed to draw gases under the atmospheric pressure. If excessive pressure is
applied to the sampling inlet and outlet (GAS IN, GAS OUT) of the gas detector, detected gases may be
leaked from its inside, thus leading to dangers. Be sure that excessive pressure is not applied to the
gas detector while used. Detected gases must be exhausted from the detected gas exhausting outlet
(GAS OUT) on the back of the gas detector to which an exhaust tube is connected, to a point regarded
as a safe place.

2. Important Notices on Safety 2-2. Warning cases
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WARNING
Handling the sensor unit
Do not disassemble the electrochemical type sensor unit (ESU) because it contains electrolyte.
Electrolyte may cause severe skin burns if it contacts skin, while it may cause blindness if it contacts
eyes. If electrolyte is adhered on your clothes, that part on your clothes is discolored or its material is
decomposed. If contact occurs, rinse the area immediately with a large quantity of water.
Zero adjustment in the atmosphere
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness before
beginning the adjustment. If interference gases exist, the adjustment cannot be performed properly,
thus leading to dangers when the gas leaks.
Operation in a gas
Do not operate the gas detector in a place where combustible/explosive gases or vapors are present.
Operating the gas detector in such an environment will lead to extreme dangers.
Response to gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on your
judgment.
Fuse
To prevent fire, use a time lag fuse with the specified ratings (3.15A, 250V) for the gas detector.
Turn the POWER switch OFF and disconnect the power plug from the outlet before replacing a fuse. Do
not use an unspecified fuse or short-circuit the fuse holder.
Power cable
To operate the gas detector on 200 VAC system, prepare a power cable that supports 200 VAC.
The power cable is provided only for the case that the power voltage is 100 VAC system (requested).
The provided power cable supports 100 VAC.
Do not touch the pyrolyzer.
The inside of the pyrolyzer reaches high temperature. Do not touch it to avoid burn injury. Do not touch
the pyrolyzer just after power-off because the inside of it is still hot.

2. Important Notices on Safety 2-3. Precautions
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2-3. Precautions
CAUTION
Do not use a transceiver near the gas detector.
Radio wave from a transceiver etc. near the gas detector or its cables may disturb indication reading. If
a transceiver or other radio wave transmitting device is used, it must be used in a place where it
disturbs nothing.
To restart the gas detector, wait for five seconds or more before doing it.
Restarting the gas detector in less than 5 seconds may cause errors.
Verify that the reading on the flow rate indicator corresponds to the specified flow rate before using the
gas detector.
If it does not correspond to the specified flow rate, gas detection cannot be performed properly. Check
whether the flow rate is unstable or lost.
Attach the provided filter before using the gas detector.
Before using the gas detector, attach the specified filter to prevent disturbances by possible gas
adsorption or air dust.
A filter to be used varies depending on the gas to be detected. For more information on filters, please
contact RIKEN KEIKI.
Also, the gas detector itself is not dust-proof. Take an appropriate measure such as attaching a
protective cover when the gas detector is used in a dusty environment.
Observe the operating restrictions to prevent condensation inside the tube.
Condensation formed inside the tube causes clogging or gas adsorption, which may disturb accurate
gas detection. Thus, condensation must be avoided. In addition to the installation environment,
carefully monitor the temperature/humidity of the sampling point to prevent condensation inside the
tube. In particular, when detecting a gas which is dissolved into water and corrodes contacted
materials, such as a strong acid gas, the gas is undetectable and furthermore may corrode internal
parts. Please observe the operating restrictions.
Do not use the external output of the gas detector to control other units.
This is not a control unit. It is not allowed to use the external output of the gas detector to control other
units.
Do not disassemble/modify the gas detector, or change the settings if not necessary.
Disassembling/modifying the gas detector will invalidate the warranty of the performance. Changing the
settings without understanding the specifications may cause alarm malfunctions. Please use the gas
detector properly in accordance with the operating manual.
Never fail to perform a regular maintenance.
Since this is a safety unit, a regular maintenance must be performed to ensure safety. Continuing to use
the gas detector without performing a maintenance will compromise the sensitivity of the sensor, thus
resulting in inaccurate gas detection.
Do not install in places where equipment cannot be operated.
Do not install the unit in a place where it is difficult to operate so that it can be operated easily in case of
emergency power-off and our maintenance equipment.
NT specification does not have CE marking
NT specification does not have CE marking. Therefore, it applies only to EA and EA(PoE)
specifications.

3. Product Components 3-1. Main unit and standard accessories
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3
3. Product Components
3-1. Main unit and standard accessories
<Main Unit> <Standard Accessories>
Operating Manual
Protective rubber cap (to be removed when
using the gas detector)
Dust filter
Silica gel filter (when using the gas detector for
C4F6/C5F8 detection)

3. Product Components 3-2. Outline drawing
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3-2. Outline drawing
3-3. Names and functions for each part
<Components of the Gas Detector>
The gas detector consists of the following units.
NOTE
The display unit is designed specifically for the gas detector.
Do not use a similar product. It will not function normally.
Display unit
Sensor unit
CAUTION
Each unit consists of precision parts. When a unit is detached, be careful not to drop it. Dropping the
unit compromises its original performance or causes malfunctions.
In addition, there is a risk of burns where high temperature caution stickers are affixed. Be careful not to
touch it.
Caution high temperature

3. Product Components 3-3. Names and functions for each part
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<Exterior of Main Unit>
(1) Display Display the gas concentration and so on.
(2) Sensor unit nameplate
display window
The sensor unit nameplate can be checked from this window.
You can identify the currently attached sensor unit.
(3) Knurled screw Fix the front cover. This is used to open/close the front cover.
(4) External terminal plate Connect cables for external signals (4 - 20 mA) and contacts.
(5) Sampling gas inlet/outlet GAS IN: Connect a sample gas suction tube.
GAS OUT: Connect a sample gas exhaust tube.
(6) Power switch Main power switch. Turn the AC power ON/OFF.
(7) Power terminal plate Connect cables for power.
(8) Fuse Main fuse.
(9) LAN connector Connect a LAN cable.
(10) Protective grounding Protective grounding （CE marking specification only）
(1)
(3)
(2)
(5)
(4)
(6)
(8) (9)
(7)
(10)

3. Product Components 3-3. Names and functions for each part
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<Interior of Main Unit>
<Unit Panels and Character LCD>
(1) MODE key Used to enter the maintenance mode.
It is also used to cancel or skip in each mode.
In the alarm test mode, it is used to reset an alarm.
(2) TEST/SET key Used to enter the test mode.
It is used for value confirmation and so on in a specific mode.
(3) ▲key Used to switch screen or change a value (UP).
(4) ▼key Used to switch screen or change a value (DOWN).
In the detection mode, it is used to reset an alarm.
(5) Sensor unit nameplate
display window
The sensor unit nameplate can be viewed through this window.
You can identify the currently attached sensor unit.
(6) Power lamp (POWER) Display unit power lamp. It lights in green when the power is on.
(7) First alarm lamp (ALM1) First alarm lamp. It blinks or lights in red when the first alarm is reached.
(8) Second alarm lamp
(ALM2)
Second alarm lamp. It blinks or lights in red when the second alarm is
reached.
(9) Fault lamp (FAULT) Fault lamp. It lights up in yellow when an abnormality is detected in the
gas detector.
(10) Gas name display Displays a gas name in chemical formula, etc. (e.g. Silane = SIH4)
(11) Concentration value
display
Displays the gas concentration and so on.
(12) Unit display Displays the unit according to the specification. (ppm, ppb, vol%, %LEL)
(13) Concentration bar
indicator
The detectable range (full scale = FS) is divided into 20 with bars. The
increase in concentration is displayed in proportion to the full scale.
(14) Alarm setpoint display The alarm setpoints (AL1 and AL2) are indicated on the concentration bar.
(15) Flow rate indicator Displays the flow rate. The center of the bars means the normal suction
flow rate of 0.5 L/min.
(16) Maintenance display Displayed during the maintenance mode. While this is displayed, the
alarm contact is disabled.
(17) Inhibit display Displayed when the inhibition (point skip) is set.
(6) Power lamp
(7) First alarm lamp (8) Second alarm lamp
(9) Fault lamp
(10) Gas name
display
(11) Concentration
display (12) Unit
display
(13) Concentration
bar indicator
(14) Alarm
setpoint
display
(15) Flow rate indicator
(16) Maintenance indicator
(17) Inhibit indicator
(1) MODE key
(2) TEST/SET key
(3) ▲key
(4) ▼key
(5) Sensor unit nameplate display window
Pyrolyzer
Pump unit
Flow sensor
Display unit

3. Product Components 3-3. Names and functions for each part
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<Detaching and Attaching Sensor Unit>
Loosen the knurled screw that fixes the front cover of the main unit and open the cover.
Push the two buttons at the top of the display unit together to open the
front cover. (Pushing only either one button cannot open the cover, but
then pushing the other can open it.)
Hold the convexed parts on both sides of the sensor unit and pull it out.
If the sensor unit is hard to detach, insert a finger into the gap at the top
right of the sensor unit and pull it out.
When attaching the sensor unit to the main unit, thrust it onto the main
unit and make sure that the sensor unit is securely fixed, otherwise it
might come off.
After replacing the sensor unit, close the front cover of the display unit.
Be sure to check the click of the front cover to fix it properly, otherwise it
might open again.
Close the front cover of the main unit and tighten the knurled screw.
Knurled screw
Top view
CAUTION
Turn the power off before detaching or attaching the
sensor unit.

3. Product Components 3-3. Names and functions for each part
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<Detaching and Attaching Pump Unit>
Open the front cover of the main unit.
Slide the tab in the direction of the arrow (toward the inside of the main unit) to open/close the pump unit
cover.
With the pump unit cover opened, the pump located inside can be pulled out.
Attach the pump in the reverse order.
After attaching the pump, check that the pump unit cover is fixed securely.
And as the connecting point (flow path) of the pump is greased, be sure to check for any dust.
Slide in the direction of arrow
Pump unit
Pump
Tab
CAUTION
If the pump and pump unit cover are not attached properly, the pump may malfunction.

3. Product Components 3-4. Block diagram
- 13 -
<How to Use Sensor Unit>
Electrochemical Type
(ESU)
Do not disassemble the sensor unit because it contains electrolyte. If contact
occurs, rinse the area immediately with a large quantity of water.
The sensor unit identifies the direction. Put the sensor unit in the dedicated
case while handling it. Do not place it on its side or upside-down.
When a new sensor unit is installed, it must be warmed up.
Although warm-up time is different depending on the type of the installed
sensor, it is recommended that warm-up should be performed for three hours
or more. Please contact RIKEN KEIKI for more information.
The sensor unit must be stored in a clean, cool and dark place away from
direct sunlight. Some types of the sensor units cannot be stored together with
other units. Please contact RIKEN KEIKI for more information.
3-4. Block diagram
<Tubing Diagram>
CAUTION
The sensor unit must be handled carefully to ensure quality as safety unit. When the sensor unit is
stored, a dedicated warehouse and power equipment for the sensor unit are needed. In principal,
the sensor unit must not be detached from the gas detector when it is handled or stored. We will
take care of your sensor unit.
Be sure that the sensor unit is not installed improperly.
If a sensor unit of different specification or principle from the one shipped from the manufacturer is
attached, a message will be displayed on the LCD of the gas detector ("C-02"). If the message is
displayed, check the specifications of the sensor unit.
After the sensor unit is replaced, always perform a calibration (zero adjustment and span
adjustment).
FLOW
SENSOR PYROLYZER
FLOW CONTROL
PUMP
SENSOR
AIR TANK
IN
OUT
TP-70DGII
Dedicated case

3. Product Components 3-4. Block diagram
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<Electric Diagram>
Controller
(CPU)
POWER INPUT (24 VDC)
Power supply part
Gas alarm contact (ALM1,
ALM2)
Fault alarm contact (FAULT)
* Standard setting of
contact activation
・De-energized
(De-energized at a
normal state)
・ON-ALARM
(Closed contact at an
alarm state)
Alarm contact controller
Transmitter
NT specification: Digital data
transmission
Ethernet and PoE specifications:
Ethernet and 4 - 20 mA DC
transmission
Display
(POWER) (ALM1) (ALM2) (FAULT)
LCD
Operating unit
(MODE) (▲) (▼) (TEST/SET)
Sensor unit
Amplifier
Controller
(CPU)
POWER INPUT
(100 - 240 VAC)
Power supply part
Pyrolyzer
(Pyrolyzer heater)
Fan
Flow
Sensor
Pump
control circuit
(Temperature, flow rate, pump, fan)
Power supply circuit

4. How to Use 4-1. Before using the gas detector
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4
4. How to Use
4-1. Before using the gas detector
Not only the first-time users but also the users who have already used the gas detector never fail to follow
the operating precautions.
Ignoring the precautions may damage the gas detector, resulting in inaccurate gas detection.
4-2. Precautions for installation sites
Do not install the gas detector in a place with vibrations or shocks.
The gas detector consists of sensitive electronic parts. The gas detector
must be installed in a stable place without vibrations or shocks and it
cannot drop.
CAUTION
This is a precision device. Because the gas detector 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 gas detector plays an important role for safety and disaster prevention, you must install as
many units of the gas detector as needed in appropriate points.
Because points where gases leak and remain easily are different depending on the types of gases and
the working areas, please decide carefully installation sites and the number of units to be installed.
CAUTION
After you received the gas detector, start using it within the specified operation start limit of the sensor
unit.

4. How to Use 4-2. Precautions for installation sites
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Do not install the gas detector in a place exposed to water, oil or
chemicals.
When selecting installation points, avoid a place where the gas detector
is exposed to water, oil or chemicals.
Do not install the gas detector in a place where the temperature drops
below 20ºC or rises over 40ºC.
The operating temperature of the gas detector is 20 to 40ºC. The gas
detector must be installed in a stable place where the operating
temperatures are maintained and do not change suddenly.
Do not install the gas detector in a place exposed to direct sunlight or
sudden changes in the temperature.
Avoid a place where the gas detector 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 gas detector, or the gas detector cannot adjust to
sudden changes in the temperature.
Keep the gas detector (and its cables) away from noise source devices.
When selecting installation points, avoid a place where
high-frequency/high-voltage devices exist.
Do not install the gas detector in a place where maintenance of the gas detector cannot be performed or
where handling the detector involves dangers.
Regular maintenance of the gas detector must be performed.
Do not install the gas detector in a place where the machinery must be stopped when maintenance is
performed in its inside, where parts of the machinery must be removed to perform maintenance, or where
the gas detector cannot be removed because tubes or racks, etc. prevent access to it. Do not install the
gas detector in a place where maintenance involves dangers, for example, near a high-voltage cable.
Do not install the gas detector in machinery which is not properly grounded.
Before installing the gas detector in machinery, the machinery must be grounded properly.
Do not install the gas detector in a place where interference gases exist around it.
The gas detector must not be installed in a place where interference gases exist around it.

4. How to Use 4-3. Precautions for system designing
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4-3. Precautions for system designing
Using a stable power supply
The external output and alarm contact of the gas detector 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 gas detector must be provided with the following power supply.
Power supply
voltage
100 - 240 VAC (terminal voltage of the gas detector) 50/60 Hz
Supply voltage fluctuations up to ±10%
Allowed time of
momentary
blackout
Up to 500 milliseconds
(To recover from the momentary
blackout for 500 milliseconds or more,
restart the gas detector.)
Example of actions
To ensure continuous operation and
activation, install a UPS (uninterruptible
power system), etc. outside the gas
detector.
Others
Do not use it with a power supply of
large power load or high-frequency
noise.
Example of actions
Use a line filter, etc. to avoid the noise
source if necessary.
Heat radiation designing
When it is installed in the closed instrumentation panel, attach ventilation fans above and below the panel.
Introducing protective measures against lightning
If cables are installed outside the factory/plant, or if internal cables are installed in the same duct as the
cables coming from outside the factory/plant, "lightning" will cause problems. Because lightning acts as a
large emission source while cables act as a receiving antenna, devices connected to the cables may be
damaged.
Lightning cannot be prevented. Cables installed in a metal conduit or under the ground cannot be
completely protected from inductive lightning surge caused by lightning. Although complete elimination of
disasters caused by lightning is impossible, the following protective measures can be taken.
Protection
against lightning
Take appropriate measures in accordance with the importance of the facilities and the
environment.
Connect the transmission signal route by using optical fiber.
Provide protection by a lightning arrester (cable arrester).
(Although inductive lightning surge can be transmitted through the cable, it is
prevented by installing a lightning arrester before the field devices and central
processing equipment. For information on how to use a lightning arrester, please
contact the manufacturer.)
Grounding In addition to lightning, there are more sources of surge noise. To protect units from
these noise sources, the units must be grounded.
CAUTION
An unstable power supply and noise may cause malfunctions or false alarms.
The descriptions in this section must be reflected on the designing of a system using the gas
detector.
Careful consideration should be given to instrumentation to maintain safety even when a trouble
like disconnection of power/signal cable or unexpected malfunction or failure occurs.
CAUTION
When the internal temperature of the gas detector reaches about 60ºC, the power will be turned off.
Since the internal temperature rises to ten-odd degrees higher than the ambient temperature, take care
not to let the ambient temperature exceed 30ºC. Provide a clearance of 30 mm or more above the gas
detector to prevent a rise in the internal temperature.

4. How to Use 4-3. Precautions for system designing
- 18 -
* The lightning arrester has a circuit to remove a surge voltage which damages field devices, so that
signals may be attenuated by installing the arrester. Before installing a lightning arrester, verify that it
works properly.
Proper use of alarm contact
The alarm contact of the gas detector is used to transmit signals to activate the alarm lamp, rotating lamp,
etc. Do not use it for controlling purpose (e.g. controlling the shutdown valve).
The specifications for the alarm contact of the gas detector are based on the resistance 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 gas detector.
Abnormal operations by an out-of-control CPU
If load is to be activated, appropriate measures must be taken to stabilize the operation of the gas detector
and protect the alarm contact referring to the following information.
Relay it with an external relay at a lower voltage of 100 VAC or below (contact amplification). At the same
time, the surge absorbing part SK1 suitable for the specifications must be attached to the external relay.
In addition, the surge absorbing part SK2 must be attached to the loaded side of the external relay if
necessary.
It may be recommended that the surge absorbing part should be attached to the contact for certain load
conditions. It must be attached to an appropriate position by checking how the load is activated.
CAUTION
The "b" contact (break contact) under de-energized state may be opened momentarily by a physical
shock, such as external force.
When the "b" contact is selected for the alarm contact, take appropriate actions to prepare for a
momentary activation, for example, add signal delay operation (approximately one second) to the
receiving side of the "b" contact.
CAUTION
In principle, do not activate inductive load at the alarm contact of the gas detector. (In particular,
never use the inductive load to activate a fluorescent lamp, motor, etc.)
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
(100 VAC or below), and then protect the contact of the gas detector with an appropriate surge
absorbing part, such as a CR circuit.

4. How to Use 4-4. How to wire
- 19 -
TP-70DGII
Coil Load
SK1 SK2
Power
supply
Power
supply
Alarm contact
External relay
(low voltage relay)
* SK1, SK2: Surge absorbing parts
4-4. How to wire
<Recommended Cables>
4 - 20 mA transmission Shielded cable of CVVS, etc. (1.25 sq) - 2-core
Contact output Cable of CVV, etc. (1.25sq) - max. 6-core
2-wire type DC power-line
communication system
Shielded twisted-pair cable of KPEV-S, etc. (1.25 sq) - 1P
LAN (for Ethernet and PoE) Ethernet cable (category 5 or higher)
UTP (unshielded twisted-pair cable)
Supported medium type: 100BASE-T or higher
Cable specification: Single wire (5 m maximum for a
stranded wire)
Modular plug: RJ-45
Number of cores: 8-core
Wire connection: Straight
<Figure of Terminal Plate>
1 2 3 4 5 6 7 8 9 10
+ －+ －
24 VDC 4-20mA ALM1
contact
ALM2
contact
FAULT
contact
1 2 3
L N FG
AC IN
CAUTION
Be careful not to damage the internal electronic circuit when wiring. In addition, be careful not to
apply stresses on the gas detector when (overweight) cables are installed.
The power cables and signal cables must not be installed together with the motor power cables,
etc. When these cables must be installed together for unavoidable reasons, put the power cables
and signal cables in a metal conduit. The conduit must be connected to a grounding circuit.