PT2E-1670

Gas Detector
70D Series Ethernet Model

System Construction Manual

RIKEN KEIKI Co., Ltd.
2-7-6 Azusawa Itabashi-Ku, Tokyo, 174-8744, Japan
Website: http://www.rikenkeiki.co.jp/

Contents
1. Introduction
1-1.

Procedures for laying Ethernet communication line ........................................................................ 2

2. Important safety information
2-1.

DANGER, WARNING, CAUTION, and NOTE ................................................................................. 3

2-2.

Warnings ......................................................................................................................................... 3

3. Ethernet communication line configuration and specifications
3-1.

Overview of communication line configurations ............................................................................... 44. Model selection
4-1.

Device and cable selection .............................................................................................................. 55. System construction
5-1.

Important information on design and cabling ................................................................................... 65-2.

LAN cable termination ..................................................................................................................... 85-3.

Gas detector installation and wiring ................................................................................................. 9

6. Testing and measurement
6-1.

Measurement and testing after cabling.......................................................................................... 166-2.

Communication test for entire network .......................................................................................... 16

7. Maintenance
7-1.

Maintenance intervals and inspection items .................................................................................. 177-2.

Securing spare parts for emergency response .............................................................................. 17

Appendices ......................................................................................................................... 18
Appendix 1. Checklist for configuration design ........................................................................................ 19
Appendix 2. System construction checklist .............................................................................................. 19
Appendix 3. Communication failure checklist .......................................................................................... 20
Appendix 4. List of measuring instruments and tools .............................................................................. 21
Appendix 5. Description of terms ............................................................................................................. 22

2. Important safety information
2-1.

DANGER, WARNING, CAUTION, and NOTE！ DANGERThe DANGER sign indicates that improper handling of the product may result
in death, severe injury, or serious property damage.

！ WARNING

The WARNING sign indicates that improper handling of the product may
result in severe injury or serious property damage.

！ CAUTION

The CAUTION sign indicates that improper handling of the product mayresult in minor injury or minor property damage.

＊NOTEThe NOTE sign indicates recommendations for product handling.

2-2.

Warnings！ WARNING
Power source
Before turning on power for the product, be sure to confirm that the power source meets the specified
voltage requirements. Avoid using unstable power sources; doing so may lead to malfunctions.
Protective grounding required
Do not cut the protective grounding line of the product or disconnect the protective grounding
terminal.
Defects involving protective functions
Before operating the product, check the protective functions for defects. Do not operate the product if
you find potential defects in protective functions, including protective grounding.
External connections
Be sure to provide secure protective grounding before connecting the product to the detection target
or external control circuit.

34. Model selection
4-1.

Device and cable selection

PoE HUB (if the system selected is PoE)
Item
Power source

Description
PoE power supply (PoE standard-compliant)
 PoE: IEEE 802.3af (1 port, MAX. 15.4 W)
 PoE+: IEEE 802.3at (1 port, MAX. 30 W)

Power supply capacity＊NOTE
Depending on the model, due to product specifications, even if thesupply capacity per port is sufficient, connecting all ports at thesame time may result in inadequate maximum supply capacity.
Select a model capable of providing the capacity needed or restrict
the number of connected detectors.
[Reference]
Number of connected gas detectors x 8 W (MAX.) ≦ Total
power supply capacity
Power consumption per gas detector = 6 W to 8 W
The specifics will differ depending on the sensor unit. Refer tothe separate specification sheet for more information.

HUB (PoE/Ethernet common specifications)
Item

Description

Power cable loosening
prevention

Model incorporating features to keep the power cable from coming
off the HUB main body(Cable loosening prevention fitting)

LAN cable
Description

Item
Cable used

UTP (Unshielded twisted pair) cable＊NOTE
If you select an STP (shielded twisted pair) cable, the shield will
not be grounded unless the connected device (HUB) also
supports STP. If this requirement is not met, problems with noise
will be even more pronounced. For this reason, we recommend
using a UTP cable.
StandardCategory 5 or 5e

Supported medium

100BASE-TX or better

Cable specifications

Solid wire cable (up to 5 m for stranded wire cable)

Modular plug

RJ-45

Number of cores

8Wire connection

Straight-through connection

57. MaintenanceThe communication line plays a significant role in this system with respect to disaster prevention andsecurity.
To maintain performance and improve reliability for disaster prevention and security, regular
maintenance is recommended.

7-1.

Maintenance intervals and inspection items
Item

Inspecting the LAN cableinstallation state

Description
The cable must be free from abnormal forces (whetherdue to tension or heavy objects).
The cable coating must be free of scratches that affectfunction.

Inspecting the LAN cableconnection

7-2.

The connector must be free of damage.

Securing spare parts for emergency response

This gas detector is connected via a communication device (HUB).
It will be subjected frequently to LAN connections and disconnections and similar procedures. If it
breaks down due to the damage caused by system construction work, the results for the host system
will be significant. To minimize the effects of a failure, we recommend stocking spare parts.
Recommended spare parts
 PoE HUB : HUB:

If using the PoE system.
If using the system with normal HUB communications and separate power supply.

17

Appendices

The appendices provide lists of check items, tools, and measuring instruments for design andconstruction.
The lists have been compiled to help you check the validity and prevent problems caused by systemconstruction. Use them effectively.

18

Appendix 1. Checklist for configuration design
Listed below are check items before construction:
No.
1

Item
Power supply
capacity in PoE HUB

23

LAN cable
Anti-noise measures
RJ-45
Modular plugselection

45

LAN cable selection
LAN cable length

Judgment criteria
The power supply capacity is sufficient even if themaximum number of gas detectors are connectedto the ports or the number of connected detectors
is restricted by design.
The cable route is isolated from noise sources.

Judgment/result OK/ NG

Plugs for stranded wire are not used for solid wire
cables.
Plugs for solid wire and stranded wire are not used
together.
UTP Category 5 or Category 5e
80 m or less

 OK/ NG OK/ NG OK/ NG OK/ NG

Appendix 2. System construction checklist
Listed below are the check items after construction.
No.
1234567891011Item
LAN cable
TensionLAN cable
Bending
LAN cable
Binding
LAN cable
Long distance parallel
cabling
LAN cable
Isolation from noise
sources

LAN cable
Treatment of excess
lengths of cable
LAN cable
Unwound portion
LAN cable
Test
LAN cable
Marking
LAN cable
Securing
Grounding

Judgment criteria
The cable is not pulled tightly but is laid loosely.

Judgment/result OK/ NG

The bending radius is 25 mm or more.

 OK/ NG

The cable is not bound tightly by cable ties, etc.

 OK/ NG

The cables are not laid completely in parallel overextended distances.

 OK/ NG

The cable is isolated in racks dedicated forcommunication or by separators.
The cable is kept away from noise sources.
[Reference] From transformers and motors: 120 cm or more
 From AC power cables:
30 cm or more
 From fluorescent lamps:
13 cm or more
When an excess length of cable is rolled in circles,
the diameters of the circles are varied.

 OK/ NG

On termination, the length unwound is 12.7 mm orless.
Straight-through connection
No wire breaks or short circuits
Each cable is 80 m or less.
Both ends are marked.
Example: Gas detector tag number
The cables are secured so that they will not comeloose even if subjected to a sudden force.
The gas detector case is grounded.
(Equivalent to Class D grounding) OK/ NG

19

 OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG

Appendix 3. Communication failure checklist
Listed below are things to check if you encounter communication problems after the host system isstarted.
No.
1

Item
No communication

2

Unstablecommunication

Judgment criteria
Is the LAN cable correctly connected?
Is the power cable of the HUB disconnected?
Is the HUB on?
Are the address and other parameters set
correctly?
Is the connector connected securely?
Are there any noise sources near the gas
detector?
Are there any noise sources near the cable route?

Check also number 1 to number 8 of [Appendix 2. System construction
checklist] on the previous page.

20

Judgment/result OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG OK/ NG

Appendix 4. List of measuring instruments and tools
Item
Crimping toolDescription
For the terminal plate of the gas detector main unit
Crimping the bar terminals
 Manufacturer
WAGO ModelVariocrimp 4 (206-204)
 Bar terminal (ferrule)
Model 216 series

Crimping tool

For LAN cable connector(Reference)
Crimping the RJ-45 modular plug

Cable tester

For LAN cable cabling check(Reference)
Check items
 Straight-through connection
 Wire breaks and short circuits
 Length21

Appendix 5. Description of terms
TermDescription

PoE

Power over Ethernet (PoE) refers to power supplied to Ethernet
devices over LAN cables.
These cables also fulfill Ethernet communication functions.

CrosstalkInterference
Crosstalk can affect communications over a UTP (unshieldedtwisted pair) cable if the signal on one cable affects a signal onanother cable, resulting in contamination with other transmission
signals.

Return loss

Loss by reflection
The ratio of reflected power to the input power expressed in dB(decibel)

22

Manual Log
Rev.
0Amendment
First issue

Issue Data
2018/6/19