Riken Keiki SD-1DGH-AS User manual

PT2E-2525
Smart Transmitter/Gas Detector Head
SD-1DGH-AS
Operating Manual
(PT2E-170)
(PT2-170)

SD-1DGH - 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 Standards and Explosion proof specification ........................ 4
2. Important Notices on Safety............................................................................................... 5
2-1. Danger cases .................................................................................................................. 5
2-2. Warning cases................................................................................................................. 6
2-3. Precautions ..................................................................................................................... 7
2-4. Safety information ........................................................................................................... 8
3. Product Components ......................................................................................................... 10
3-1. Main unit and standard accessories ................................................................................ 10
3-2. Names and functions for each part.................................................................................. 12
3-3. Block diagram.................................................................................................................. 14
4. How to Use ........................................................................................................................ 16
4-1. Before using the detector ................................................................................................ 16
4-2. Precautions for installation points.................................................................................... 16
4-3. Precautions for system designing.................................................................................... 17
4-4. How to install ................................................................................................................... 20
4-5. How to wire...................................................................................................................... 21
4-6. How to tube ..................................................................................................................... 26
5. How to Operate.................................................................................................................. 27
5-1. Preparation for start-up.................................................................................................... 27
5-2. Basic operating procedures............................................................................................. 28
5-3. How to start the detector ................................................................................................. 29
5-4. Modes ............................................................................................................................. 31
5-5. User mode....................................................................................................................... 32
5-6. Flow Rate Adjustment ..................................................................................................... 35
5-7. How to exit....................................................................................................................... 35
6. Operations and Functions.................................................................................................. 36
6-1. Gas alarm activation........................................................................................................ 36
6-2. Fault alarm activation ...................................................................................................... 37
6-3. External output operation ................................................................................................ 38
6-4. Other functions ................................................................................................................ 39
7. Maintenance ...................................................................................................................... 40
7-1. Maintenance intervals and items ..................................................................................... 40
7-2. Regular maintenance mode ............................................................................................ 42
7-3. Calibration method .......................................................................................................... 51
7-4. Replacement parts .......................................................................................................... 54
8. Storage, Relocation and Disposal...................................................................................... 55
8-1. Procedures to store the detector or leave it for a long time ............................................. 55
8-2. Procedures to relocate the detector or use it again ......................................................... 55
8-3. Disposal of products........................................................................................................ 55
9. Troubleshooting ................................................................................................................. 56
10. Product Specifications ........................................................................................................ 58
10-1. List of specifications ...................................................................................................... 58
10-2. Detection principle......................................................................................................... 63
11. Definition of Terms.............................................................................................................. 64

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-1DGH-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 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.
Although the number of digits to display varies depending on the detection range, this manual provides
explanation using a detection range from 0 to 2000ppm 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/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.

2 Important Notices on Safety 2-1. Danger cases
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DANGER
About explosion-proof
The window plate material is a polycarbonate resin. Do not use organic solvents and alkali types
(liquid or vapor). It may cause the color and shape of the window plate to be changed.
Do not open the lid when applying current.
Do not attempt to repair the detector.
For the lid, use hexagon socket head bolts specified by RIKEN KEIKI.
Do not apply a strong force or shock to the window plate. The explosion-proof performances may
be deteriorated due to damages. The explosion protection conditions for the detector is "low
(2J)" possibility of mechanical damage.
Do not replace parts at your sole discretion but contact RIKEN KEIKI if the transparent window
has a crack or the explosion-proof joint surface is abnormal, or the clamping screw or bolt is
changed, lost etc.
Do not repair the explosion-proof joint surface.
Be careful not to hit sharp tools against the window plate.
2
Important Notices on
Safety
2-1. Danger cases

2 Important Notices on Safety 2-2. Warning cases
SD-1DGH-AS - 6 -
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 detector to the external control circuit, securely connect it to a protective
grounding circuit.
Tubing
The detector is designed to draw gases around it under the atmospheric pressure. Be sure that
excessive pressure is not applied to the sampling inlet and outlet (GAS IN, GAS OUT) of the
detector. Detected gases must be exhausted from the detected gas exhausting outlet (GAS OUT) to
which an exhaust tube is connected, to a point regarded as a safe place.
Zero adjustment in the atmosphere
When the zero adjustment is performed in the atmosphere, check the atmosphere for freshness
before beginning the adjustment. If other gases exist, the adjustment cannot be performed properly,
thus leading to dangers when the gas leaks.
Response to gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on
your judgment.
2-2. Warning cases

2 Important Notices on Safety 2-3. Precautions
- 7 - SD-1DGH-AS
CAUTION
Do not use a transceiver near the detector.
Radio wave from a transceiver near the detector or its cables may disturb indication reading. If a
transceiver 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 flow rate 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.
Avoid applying organic solvents and others to the window plate for a long time.
The window plate material is a polycarbonate resin. When organic solvents (liquid or
highly-concentrated vapor) and others are applied to the plate for a long time, its color and shape
may be changed.
Do not forget 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 a maintenance will deteriorate the sensitivity of the sensor, thus
resulting in inaccurate gas detection.
2-3. Precautions