Riken Keiki SD-2500 User manual

PT2E-15913
Furnace Gas Monitor
SD-2500
Operating Manual
(PT2E-159)
(PT2-159)

SD-2500
Operating Precautions
This gas monitor is a gas detector that detects combustible 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. This gas monitor may be interfered by gases and vapors other than the gas to be detected.
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 gas monitor can be ensured.
In facilities compliant with the High Pressure Gas Safety Act, an alarm setting below our standard alarm
setpoint may trigger a false alarm.
3. This is a safety unit, not a control unit.
The alarm contact output of the gas monitor must be used for an external alarm lamp/buzzer, while the
analog signal output must be used for an indicator or external recorder. If these outputs are used to
control other units, we shall not be responsible for any malfunctions.
4. The gas sensing part of the gas detection sensor installed in this gas monitor is made of metal porous
sintered alloy permeated with an oxidation catalyst.
If silicon or sulfide compounds are accumulated on the surface of porous sintered alloy, the area of the
gas sensing part becomes smaller, which may results in serious deterioration of its sensitivity.
For safety reasons, do not use the gas monitor under the presence of silicon or sulfide compounds
even though their amount is very small.
5. For maintenance of the gas monitor, 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 gas calibration are
performed every six months in accordance with the regulations.

<Contents>
1 Outline of the Product.............................................................................................. 1
1-1. Preface .................................................................................................................... 1
1-2. Purpose of use ........................................................................................................ 1
1-3. Definition of DANGER, WARNING, CAUTION, and NOTE ..................................... 1
1-4. Method of confirmation for Standards and Explosion proof specification.................
2 Important Notices on Safety .................................................................................... 3
2-1. Danger cases .......................................................................................................... 3
2-2. Warning cases......................................................................................................... 3
2-3. Precautions ............................................................................................................. 4
2-4. Safety Information ................................................................................................... 4
3 Product Components............................................................................................... 6
3-1. Main unit and standard accessories ........................................................................ 6
3-2. Names and functions for each part.......................................................................... 7
3-3. Block diagram.......................................................................................................... 8
4 How to Use.............................................................................................................. 9
4-1. Before using the gas monitor................................................................................... 9
4-2. Precautions for installation points............................................................................ 9
4-3. Precautions for system designing............................................................................ 10
4-4. How to install ........................................................................................................... 13
4-5. How to wire.............................................................................................................. 14
5 How to Operate ....................................................................................................... 19
5-1. Preparation for start-up............................................................................................ 19
5-2. Basic operating procedures..................................................................................... 19
5-3. How to start the gas monitor.................................................................................... 20
5-4. Modes...................................................................................................................... 21
5-5. User mode............................................................................................................... 22
5-6. How to exit............................................................................................................... 24
6 Operations and Functions ....................................................................................... 25
6-1. Gas alarm activation................................................................................................ 25
6-2. Fault alarm activation .............................................................................................. 26
6-3. External output operation ........................................................................................ 27
6-4. Other functions ........................................................................................................ 28
7 Maintenance............................................................................................................ 29
7-1. Maintenance intervals and items ............................................................................. 29
7-2. Regular maintenance mode .................................................................................... 31
7-3. Gas calibration method............................................................................................ 38
7-4. Parts replacement ................................................................................................... 40
8 Storage, Relocation and Disposal ........................................................................... 41
8-1. Procedures to store the gas monitor or leave it for a long time............................. 41
8-2. Procedures to relocate the gas monitor or use it again ........................................... 41
8-3. Disposal of products................................................................................................ 41
9 Troubleshooting....................................................................................................... 42
10 Product Specifications ............................................................................................. 44
10-1. List of specifications ................................................................................................ 44
10-2. List of accessories................................................................................................... 47
10-3. Detection principle................................................................................................... 48
11 Definition of Terms................................................................................................... 49
2

1 Outline of the Product 1-1. Preface
SD-2500 - 1 -
1
Outline of the Product
1-1. Preface
Thank you for choosing our furnace gas monitor SD-2500. 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 monitor and its specifications. It contains information required for
using the gas monitor 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 monitor.
1-2. Purpose of use
The gas monitor is a fixed type detector head that continuously detects combustible gases and that
performs the alarm activation when the gas concentration is over the setting value.
This gas monitor 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 monitor before using it, so
that it can be used properly.
The gas monitor 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 gas monitor has a built-in alarm contact and can be used either as a gas alarm, fault alarm, or common
(gas, fault) alarm.
The gas monitor 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.

2 Important Notices on Safety 2-1. Danger cases
- 3 - SD-2500
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 repair the explosion-proof joint surface.
2
Important Notices on
Safety
2-1. Danger cases
2-2. Warning cases
WARNING
Power supply
Before turning on the gas monitor, 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 monitor, check the protective functions for defects. When seeming defects are
found in the protective functions, such as protective grounding, do not start the gas monitor.
External connection
Before connecting the gas monitor to the external control circuit, securely connect it to a protective
grounding circuit.

2 Important Notices on Safety 2-3. Precautions
SD-2500 - 4 -
WARNING
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 a gas alarm
Issuance of a gas alarm indicates that there are extreme dangers. Take proper actions based on your
judgment.
2-3. Precautions
CAUTION
Do not use a transceiver near the gas monitor.
Radio wave from a transceiver near the gas monitor 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 gas monitor, wait for five seconds or more before doing it.
Restarting the gas monitor within five seconds may cause errors.
Do not use the external output of the gas monitor to control other units.
This is not a control unit. It is not allowed to use the external output of the gas monitor to control other
units.
Do not disassemble/modify the gas monitor, or change the settings if not necessary.
Disassembling/Modifying the gas monitor will invalidate the warranty of the performance. Changing the
settings without understanding the specifications may cause alarm malfunctions. Please use the gas
monitor 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.
The zero adjustment in the furnace
After the furnace becomes the operating temperature, perform the zero adjustment carry out after one
hour.
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 gas monitor without performing a maintenance will deteriorate the sensitivity of the sensor, thus
resulting in inaccurate gas detection.

3 Product Components 3-1. Main unit and standard accessories
SD-2500 - 6 -
3
Product Components
3-1. Main unit and standard accessories
<Main Unit> (including a cable gland)
<Standard Accessories>
Operating manual
Dedicated handling lever (used for the wiring)
Dedicated control key
Flange gasket
Exhaust air direction nameplate
CAUTION
Use the supplied dedicated control key to operate the gas monitor. If products other than these
accessories are used, key operations cannot be accepted properly.