Riken Keiki GD-70D Series User manual

PT2E-15613
Gas Detector Head
GD-70D Series
GD-70D
GD-70D-NT
GD-70D-EA
GD-70D-DV
GD-70D-LN
Operating Manual

2
Contents
1. Outline of the Product..................................................................................................................................... 3
1-1. Preface .................................................................................................................................................... 3
1-2. Purpose of use ........................................................................................................................................ 3
1-3. Definition of DANGER, WARNING, CAUTION and NOTE .................................................................. 4
1-4. Method of confirmation for CE marking type........................................................................................... 4
2. Important Notices on Safety........................................................................................................................... 5
2-1. Danger cases........................................................................................................................................... 5
2-2. Warning cases ......................................................................................................................................... 6
2-3. Precautions.............................................................................................................................................. 7
3. Product Components...................................................................................................................................... 8
3-1. Main unit and standard accessories........................................................................................................ 8
3-2. Outline drawing........................................................................................................................................ 9
3-3. Names and functions for each part ....................................................................................................... 11
3-4. Block diagram ........................................................................................................................................21
4. How to Use ...................................................................................................................................................23
4-1. Before using the detector ......................................................................................................................23
4-2. Precautions for installation sites............................................................................................................ 23
4-3. Precautions for system designing .........................................................................................................25
4-4. How to install .........................................................................................................................................27
4-5. How to wire ............................................................................................................................................ 29
4-6. How to tube............................................................................................................................................40
5. How to Operate ............................................................................................................................................42
5-1. Preparation for start-up ......................................................................................................................... 42
5-2. Basic operating procedures................................................................................................................... 43
5-3. How to activate the detector..................................................................................................................44
5-4. Modes ....................................................................................................................................................45
5-5. Detection mode .....................................................................................................................................47
5-6. Alarm test mode.....................................................................................................................................47
5-7. User mode .............................................................................................................................................48
5-8. How to exit .............................................................................................................................................53
6. Operations and Functions ............................................................................................................................54
6-1. Gas alarm activation..............................................................................................................................54
6-2. Fault alarm activation ............................................................................................................................59
6-3. External output operation ......................................................................................................................60
6-4. Other functions ......................................................................................................................................63
6-5. About LONWORKS (LN specification) ..................................................................................................66
7. Maintenance .................................................................................................................................................70
7-1. Maintenance intervals and items........................................................................................................... 70
7-2. Regular maintenance mode ..................................................................................................................72
7-3. Calibration method ................................................................................................................................ 88
7-4. Other adjustments/cleaning method ..................................................................................................... 90
7-5. How to replace parts..............................................................................................................................91
8. Storage, Relocation and Disposal................................................................................................................94
8-1. Procedures to store the detector or leave it for a long time..................................................................94
8-2. Procedures to relocate the detector or use it again ..............................................................................94
8-3. Disposal of products ..............................................................................................................................94
NOTE............................................................................................................................................................95
9. Troubleshooting ............................................................................................................................................96
10. Product Specifications.............................................................................................................................. 100
10-1. List of specifications ..........................................................................................................................100
10-2. List of accessories .............................................................................................................................104
10-3. Detection principle .............................................................................................................................104
11. Definition of Terms .................................................................................................................................... 114

1. Outline of the Product 1-1. Preface
3
1
1. Outline of the Product
1-1. Preface
Thank you for choosing our gas detector head GD-70D Series. Please check that the model number of the
product you purchased is included in the specifications on this manual.
This manual explains how to use the gas detector and its specifications. It contains information required for
using the 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 head.
1-2. Purpose of use
This is a fixed type gas detector head 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
detector before using it, so that it can be used properly.
The detector detects abnormalities in the air caused by presence of gases or other reasons (leak and
oxygen deficiency) with the built-in gas sensor unit. The concentrations of detected gases are
displayed on the character LCD.
The built-in pump in the detector draws gas to perform gas detection.
The gas detector head has two-step gas alarm contact and fault alarm contact.
The detector outputs gas concentration in 4 - 20 mA or digital data.
The communication method for each specification is as follows.
GD-70D 4 - 20 mA specification Analog transmission
GD-70D-NT NT specification 2-wire type DC power-line communication
GD-70D-EA EA specification Ethernet and analog transmission (4 - 20 mA)
GD-70D-DV DV specification DeviceNet transmission
GD-70D-LN LN specification LONWORKS

1. Outline of the Product 1-3. Definition of DANGER, WARNING, CAUTION and NOTE
4
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.
1-4. 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
5
2
2. Important Notices on
Safety
2-1. Danger cases
DANGER
This is not an explosion-proof unit. Do not use the unit in place where gas over the lower explosive
limit may exist.

2. Important Notices on Safety 2-2. Warning cases
6
2-2. Warning cases
WARNING
Power supply
Before turning on the 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 detector, check the protective functions for defects. When seeming defects are
found in the protective functions, such as protective grounding, do not start the detector.
External connection
Before connecting the alarm system to a detection target or external control circuit, securely connect
it to a protective grounding circuit.
Tube
The 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 detector, detectable gases may be
leaked from its inside, thus leading to dangers. Be sure that excessive pressure is not applied to the
detector while used. Detected gases must be exhausted from the detected gas exhausting outlet
(GAS OUT) on the back of the detector to which an exhaust tube is connected, to a point regarded as
a safe place.
Handling the sensor unit
Do not disassemble the electrochemical type sensor unit (ESU) or galvanic cell type sensor unit
(OSU) because they contain electrolyte. Electrolyte may cause severe skin burns if it contacts skin,
while it may cause blindness if its 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 (fresh air adjustment) in the atmosphere
When zero adjustment (fresh air adjustment for oxygen deficiency alarm specification) is performed in
the atmosphere, check the atmosphere for freshness before beginning the adjustment. If interference
gases (other than measuring and base gases) exist, the adjustment cannot be performed properly,
thus leading to dangers when the gas leaks.
Operation in a gas
Do not operate the detector in a place where combustible/explosive gases or vapors are present.
Operating the detector in such an environment will lead to extreme dangers.
Response to a gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on your
judgment.

2. Important Notices on Safety 2-3. Precautions
7
2-3. Precautions
CAUTION
Do not use a transceiver near the detector.
Radio wave from a transceiver, etc. near the 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 detector, wait for five seconds or more before doing it.
Restarting the detector within five seconds may cause errors.
Verify that the reading on the flow rate indicator corresponds to the specified flow rate before using
the 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 dust filter before using the detector.
Before using the detector, attach the specified filter to prevent disturbances by possible gas
adsorption or air dust.
A dust filter to be used varies depending on the gas to be detected. For more information on dust
filters, please contact RIKEN KEIKI.
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 detector to control other units.
This is not a control unit. It is not allowed to use the external output of the detector to control other
units.
Do not disassemble/modify the detector, or change the settings if not necessary.
Disassembling/modifying the detector will invalidate the warranty of the performance. Changing the
settings without understanding the specifications may cause alarm malfunctions. Please use the
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 detector without performing maintenance will compromise the sensitivity of the sensor, thus
resulting in inaccurate gas detection.

3. Product Components 3-1. Main unit and standard accessories
8
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 detector)
Dedicated handling lever (for wiring)
Dust filter
Interference gas removal filter
(to be supplied with sensor units for certain gases)
●GD-70D-DV (Main Unit + 70D-DV Unit)
<Standard Accessories>
Operating manual
Protective rubber cap (to be removed when using
the detector)
Dedicated handling lever (for wiring)
Dust filter
Interference gas removal filter
(to be supplied with sensor units for certain gases)
External connector for 5-pin communication

3. Product Components 3-2. Outline drawing
9
<Pyrolyzer Unit (PLU-70)(Option)>
* This is needed in “pyrolyzer + electrochemical type (ESU)” and “pyrolyzer + pyrolysis-particle type
(SSU)”.
For more information on the pyrolyzer unit (PLU-70), see the separate operating manual.
3-2. Outline drawing
●Main Unit
Pyrolyzer Unit
(Unit: mm)
M5 mounting hole
GAS IN
GAS OUT
Sensor unit display
Operating switch
Dis
p
la
y
Protective cover for power switch
Screw for grounding earth rod
External wire hole
Connector for PLU
Connector for PoE
Power switch

3. Product Components 3-2. Outline drawing
10
●GD-70D-DV (Main Unit + 70D-DV Unit)
MS lamp
Screw for grounding
earth rod
Operating switch
Display window
NS lamp
Protective cover for power switch
Terminal block
Sensor unit display
Power switch
Mounting hole for 3-M5
DeviceNet communication socket

3. Product Components 3-3. Names and functions for each part
11
3-3. Names and functions for each part
The detector consists of the following units.
●Main Unit
●70D-DV Unit
Wall-mounted unit Main unit
Pump unit
Sensor unit
Base
70D-DV unit
Terminal plate for power/contact
70D main unit
Terminal plate for DeviceNet
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.

3. Product Components 3-3. Names and functions for each part
12
<Detaching and Attaching Main Unit>
Detaching Main Unit
While pushing the sky blue lock lever toward the wall-mounted unit, hold up the main unit.
If you cannot move the main unit, insert a larger flathead screwdriver while pushing the lock lever, and you
can easily detach it as shown below. Do not rotate or move up and down the flathead screwdriver. Simply
insert it into the wall-mounted unit.
Attaching Main Unit
At the position 10 mm above the wall-mounted unit, press the main unit onto the wall-mounted unit. Be sure
to fit both side hooks of the wall-mounted unit in the grooves of the main unit.
Then press down the main unit to fix it. The lock at the bottom of the main unit clicks to fix it properly. Make
sure that the top center of the wall hanger unit is above the main unit as viewed from front.
10mm Make sure that the top
of the wall-mounted unit
is above the main unit.
The lock clicks.
When pressing the main unit,
align the side mark with the hook
of the wall hanger unit for smooth
installation.
CAUTION
Be careful not to drop the main unit when detaching it. Also, check the secure installation of the
main unit after attaching it to the wall-mounted unit. If the main unit is not securely installed, it might
fall, causing an unexpected injury or a damage of the unit.
Turn the power off before detaching or attaching the main unit.

3. Product Components 3-3. Names and functions for each part
13
<Detaching and Attaching Sensor Unit>
Push the two buttons at the top of the main unit together to open the front
cover. (Pushing only either one button cannot open the cover, but then
pushing the other can open it.)
* The front cover opens about 90 degrees at first. You can push it down to
180 degrees.
Hold the convex parts on both sides 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. Be sure to
check the click of the front cover to fix it properly, otherwise it might
open again.
<Detaching and Attaching Pump Unit>
After detaching the sensor unit, push down to open the
pump stopper. Pinch the part labeled "PULL" at the top of
the pump unit, and pull it out.
When attaching the pump unit to the main unit, position the grooves of the pump unit at the rails of the main
unit and push the pump unit.
Do not push the center diaphragm. Push the part labeled "PULL". And as the connecting point (flow path)
of the pump unit is greased, be sure to check any dust.
CAUTION
Turn the power off before detaching or attaching the
sensor unit.

3. Product Components 3-3. Names and functions for each part
14
<70D-DV Unit Installation Procedure>
Loosen two screws at the mounting holes of the 70D-DV unit (about five turns) to detach the base.
If the base cannot be detached easily, insert the flathead screwdriver at the place indicated in the figure
below, and then lift the 70D-DV unit to easily detach the base.
Use a screw (3-M5) to mount the base on the wall.
Thread the screw heads on the base through the mounting holes of the 70D-DV unit, slide the base
downward, and tighten the screw (two places).
Groove Rail
Connecting point
(flow path)
Do not push
here.
"PULL"
×
Screws

3. Product Components 3-3. Names and functions for each part
15
3-M5
Opposite side
Thread the
screw heads
O
pp
osite
Slide downward

3. Product Components 3-3. Names and functions for each part
16
<Front Panel and Character LCD>
(1) MODE key Used to enter the maintenance mode.
It is also used to cancel or skip in a specific mode.
(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).
(5) Lock lever Lever to lock the main unit. Push it to attach or detach the main unit.
(6) Sensor unit nameplate
display window
Window to check the nameplate of the sensor unit.
You can identify the currently attached sensor unit.
(7) Power lamp (POWER) Power lamp. It lights in green when the power is on.
(8) First alarm lamp (ALM1) First alarm lamp. It lights in red when the first alarm is reached.
(9) Second alarm lamp (ALM2) Second alarm lamp. It lights in red when the second alarm is reached.
(10) Fault lamp (FAULT) Fault lamp. It lights in yellow when an abnormality is detected in the
detector.
(11) Gas name display Displays a gas name in chemical formula, etc. (e.g. Silane = SIH4)
(12) Concentration value
display
Displays the gas concentration and so on.
(13) Unit display Displays the unit according to the specification. (ppm, ppb,
vol%, %, %LEL)
(14) 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.
(15) Alarm setpoint display The alarm setpoints (AL1 and AL2) are indicated on the concentration
bar.
(16) Flow rate indicator Displays the flow rate. The center of the bars means the normal flow
rate of 0.5 L/min.
(17) Communication indicator For GD-70D-NT, this indicator is displayed while transmitting data with
the upper unit. (TX, RX).
(1) MODE key
(2) TEST/SET key
(3) ▲key
(4) ▼key
(5) Lock lever
(6) Sensor unit nameplate display window
(7) Power lamp
(8) First alarm lamp (9) Second alarm lamp
(10) Fault lamp
(11) Gas name display
(12) Concentration value
display
(13) Unit display
(14) Concentration bar
indicator
(15) Alarm setpoint display
(16) Flow rate indicator
(17) Communication
indicator
(18) Maintenance display
(19) Inhibit display
(20) Pyrolyzer unit
connection indicator

3. Product Components 3-3. Names and functions for each part
17
(18) Maintenance indicator Displayed during the maintenance mode. When this indicator is
displayed, the alarm contact is disconnected to be disabled.
(19) Inhibit indicator Displayed when the inhibition (point skip) is set.
(20) Pyrolyzer unit connection
indicator
Displayed when the dedicated pyrolyzer unit (PLU-70) is connected.
<Wall-mounted Unit>
<How to Use Sensor Unit>
A sensor unit installed in the detector is the same regardless of the detection principle, thus
sensor units are interchangeable.
Each sensor unit has a different color in accordance with the principle as shown below.
How to handle the sensor unit varies depending on its principle.
Mounting hole: A hole for wall-mount.
Terminal plate: A terminal to which a power supply,
signal cables and other external wires are connected
(10P).
Lock lever: A lever to lock the main unit.

3. Product Components 3-3. Names and functions for each part
18
<70D-DV Unit>
(21) MS lamp Module status indicator lamp. It lights in green at a normal state.
(22) NS lamp Network status indicator lamp. It lights in green at a normal state.
(23) Terminal plate for
power/contact
Connects the power cables for power lines and contact output.
(24) Terminal plate for
DeviceNet
Connects the dedicated DeviceNet cable.
(22)
(21)
(23)
(24)
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 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 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).

3. Product Components 3-3. Names and functions for each part
19
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.
Pyrolysis-Particle
Type
(SSU-1925)
Although the sensor unit contains radioactive materials, it is certified as a
specified designing certification device, which is regarded as a device having no
influences on health. Observe the “Safety Manual” which stipulates conditions
for the certification. To dispose of the sensor unit, you must return it to us. You
do not need to take any additional actions.
The sensor unit contains a small amount of radioactive materials. Do not
disassemble it, or dispose of it like other wastes.
The sensor unit must be put into the dedicated case specified by us, and stored
away from direct sunlight in a clean place where the temperature and humidity
are maintained at a normal level and where appropriate measures are
introduced to prevent it from being taken out easily.
When the sensor unit is transported out of your factory, please use a
transportation company which can handle specified designing certification
devices (L-type packages).
For more information, see the “Safety Manual”.
Pyrolysis-Particle
Type
(SSU-1927)
Overseas only
Although the sensor unit contains radioactive material, the radioactivity is below
10kBq that is determined by IAEA (radiation safe level). So the sensor unit is
capable of handling as a general transport product.
The sensor unit must be put into the dedicated case specified by us, and stored
away from direct sunlight in a clean place where the temperature and humidity
are maintained at a normal level.
Dedicated case
Dedicated case

3. Product Components 3-3. Names and functions for each part
20
New Ceramic Type
(NCU)
Before using this sensor unit, it must be warmed up for two hours or more.
The sensor unit must be stored under normal temperature/humidity in a clean
place away from direct sunlight.
Semiconductor Type
(SGU)
Hot-wire
semiconductor Type
(SHU)
Before using the sensor unit, it needs to be warmed up for a specified time. The
sensor unit is warmed up sufficiently in our factory before it is delivered to you.
Therefore, after you receive the sensor unit, please use it as soon as possible
so that unpowered time is minimized.
The warm-up (powered) time before using the sensor unit is related to the
unpowered time.
Unpowered time
Expected powered time
SGU-8541 (H2)
SHU-8644(H2)
SGU (Others)
10 minutes or less 10 minutes or
more
2 hours or more
1 hours or less 30 minutes or
more
2 hours or more
24 hours or less 1 hours or more 4 hours or more
72 hours or less 4 hours or more 24 hours or more
10 days or less 2 days or more 2 days or more
Less than 1
month
7 days or more 7 days or more
Less than 3
months
14 days or more 14 days or more
3 months or more 1 month or more 1 month or more
To store the sensor unit under unpowered state, it must be stored under normal
temperature/humidity in a clean place away from direct sunlight.
Galvanic Cell Type
(OSU)
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 must be stored under normal temperature/humidity in a clean
place away from direct sunlight.
NDIR(Non-Dispersive
Infrared Absorption)
Type
(IRU)
Before using this sensor unit, it must be warmed up for ten minutes.
The indicated value of this sensor unit varies depending on the pressure in the
measurement environment. Be careful when using.
The sensor unit interferes with CO2.
The sensor unit must be stored under normal temperature/humidity in a clean
place away from direct sunlight.