Riken Keiki SD-1DEC-AS User manual

PT2E-2464
Smart Transmitter/Gas Detector Head
SD-1DEC-AS
Operating Manual
(PT2E-178)
(PT2-178)

Operating Precautions
This detector is a gas detector that detects toxic gases in the air and triggers a gas alarm.
The gas detector is a safety unit, not an analyzer or densitometer which performs quantitative/qualitative
analysis/measurement for gases.
Please fully understand the following points before using it, so that it can be used properly.
1. The detector may be interfered by gases other than the gas to be detected, solvents, vapors etc.
Please note that the alarm may be triggered by interference. In addition, it may be fluctuated by
environmental (temperature, humidity etc.) changes in the installation site.
2. The alarm must be set within a range where the performance of the detector can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard alarm
setpoint (threshold limit value) may trigger a false alarm.
3. This is a safety unit, not a control unit.
The alarm contact output of the detector must be used for an external alarm lamp/buzzer, while the
analog signal output must be used for an indicator or external recorder.
4. Because the contact point of the gas detector sensor is made of porous polymeric membrane, the water
repellency of the membrane is deteriorated by solvents, thus causing an electrolyte leak from its inside.
Do not use solvents near the detector. If a solvent is used for unavoidable reasons, attach the
recommended filter to the inlet of the gas detector while using the solvent and for one hour after that.
5. For maintenance of the detector, it must go through a regular maintenance, including replacement and
adjustment of the regular replacement parts as specified in the operating manual. In addition, because
this is a safety unit, it is recommended that a regular maintenance and a calibration are performed every
six months in accordance with the regulations.

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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 Standards and Explosion proof specification .......................... 3
2 Important Notices on Safety .................................................................................................. 4
2-1. Danger cases .................................................................................................................... 4
2-2. Warning cases .................................................................................................................. 5
2-3. Precautions ....................................................................................................................... 6
2-4. Safety Information ............................................................................................................. 7
3 Product Components............................................................................................................. 9
3-1. Main unit and standard accessories.................................................................................. 9
3-2. Names and functions for each part ................................................................................... 11
3-3. 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 ..................................................................................... 16
4-4. How to install..................................................................................................................... 18
4-5. Installation procedure........................................................................................................ 19
4-6. How to wire ....................................................................................................................... 21
4-7. How to tube ....................................................................................................................... 25
5 How to Operate ..................................................................................................................... 26
5-1. Preparation for start-up ..................................................................................................... 26
5-2. Basic operating procedures............................................................................................... 26
5-3. How to start the gas detector ............................................................................................ 27
5-4. Modes ............................................................................................................................... 28
5-5. User mode......................................................................................................................... 29
5-6. Flow Rate Adjustment ....................................................................................................... 32
5-7. How to exit ........................................................................................................................ 32
6 Operations and Functions ..................................................................................................... 33
6-1. Gas alarm activation ......................................................................................................... 33
6-2. Fault alarm activation ........................................................................................................ 34
6-3. External output operation .................................................................................................. 35
6-4. Other functions.................................................................................................................. 36
7 Maintenance.......................................................................................................................... 37
7-1. Maintenance intervals and items....................................................................................... 37
7-2. Regular maintenance mode .............................................................................................. 39
7-3. Calibration method ............................................................................................................ 46
7-4. Replacement parts ............................................................................................................ 49
8 Storage, Relocation and Disposal ......................................................................................... 51
8-1. Procedures to store the gas detector or leave it for a long time ........................................ 51
8-2. Procedures to relocate the detector or use it again........................................................... 51
8-3. Disposal of products.......................................................................................................... 51
9 Troubleshooting..................................................................................................................... 52
10 Product Specifications......................................................................................................... 54
10-1. List of specifications ........................................................................................................ 54
10-2. Detection principle........................................................................................................... 58
11 Definition of Terms............................................................................................................... 59

1 Outline of the Product 1-1. Preface
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1
Outline of the Product
1-1. Preface
Thank you for choosing our smart transmitter/gas detector head SD-1DEC-AS. 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 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 detector.
This manual provides explanation using CO detection range from 0 to 150 ppm as examples (such as
examples of LED display).
1-2. Purpose of use
This detector is a fixed type gas detector head that detects leak of combustible gases, toxic gases and
performs the alarm activation when the gas concentration is over the setting value.
The 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) with
the built-in gas sensor. The concentrations of detected gases are displayed on the seven-segment
LED.
The detector draws a gas by an aspirator using compressed air to perform gas detection.
The detector has a built-in alarm contact and can be used either as a gas alarm, fault alarm or common
(gas, fault) alarm.
The detector outputs gas concentration in 4 – 20 mA.
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 Standards and Explosion proof specification
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1-4. Method of confirmation for Standards and
Explosion proof specification
This instrument has some specification depends on standard and explosion proof certificate. Please
confirm the detector 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 name plate as
follows.
ATEX/IECEx, CE marking type name plate TIIS type name plate
CE marking
TIIS certificate
Ex marking

3 Product Components 3-1. Main unit and standard accessories
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3
Product Components
3-1. Main unit and standard accessories
<Main Unit>
<Standard Accessories>
Operating manual ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ one
Dedicated handling lever ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ one
Dedicated control key ꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏꞏ The supplied quantity depends on the number of units to be delivered.
1 to 10 units One
11 to 20 units Two
21 to 50 units Three
Over 51 units Four
MC filter with flow monitor ꞏꞏꞏꞏꞏꞏꞏꞏꞏ one

3 Product Components 3-2. Names and functions for each part
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(1) MENU/ESC key Used to enter the maintenance mode.
It is also used to cancel in a specific mode.
(2) SET key It is used for value confirmation and so on in a specific
mode.
(3) ▲key Used to switch menus or change a value (UP).
(4) ▼key Used to switch menus or change a value (DOWN).
(5) Power lamp
Power lamp.
Detection mode: It lights up in green.
Maintenance mode: It blinks in green.
(6) Alarm lamp Alarm lamp. It lights up in red when the alarm setpoint value
is reached.
(7) Fault lamp Fault lamp. It lights up in yellow when an abnormality is
detected in the detector.
(8) Concentration value
display Display the gas concentration and so on.
(8) Concentration value display
(5) Power lamp (6) Alarm lamp (7) Fault lamp
(1) MENU/ESC key
(2) SET key (4) ▼key
(3) ▲key