Riken Keiki RI-557 User manual

PT3E-0391
OPERATION AND MAINTENANCE MANUAL
FOR
RIKEN COMPACT INFRARED GAS MONITOR
MODEL ＲＩ－５５７
•Request for the Customers
•Read and understand this operating manual before using the detector.
•You must operate the detector in accordance with the operating manual.
•Regardless of warranty period, we shall not make any compensation for accidents and
damage caused by using this product.
The compensation shall be made only under the warranty policy of products or parts
replacement.
•Because this is a safety unit, a regular maintenance for every six months and daily
maintenance must be performed.
•If you find abnormalities in the detector, please notify them to our local representative
immediately.

[CAUTIONS ON OPERATION]
This is an infrared single gas monitor designed to measure one of the specified gas for
carbon monoxide, carbon dioxide or methan in air.
The gas monitor is a safety instrument, not an analyzer nor measuring instrument to
make quantitative and qualitative analysis or measurement.
Please understand following points and use this monitor correctly.
１． This gas monitor may respond to other gas and vapors than the target gas.
Be care to alarm action by interference.
It may fluctuate against the environmental(temperature, humidity, etc.) change
around the monitor.
Perform zero adjustment with regular interval(approx once a month).
2. Avoid to use this monitor at the place where the temperature is drastically(approx 10
～15℃) changed.
3. Alarm level shall be set within the performance of this monitor.
If set below our standard alarm level(20% of full scale), it may be caused to false
alarm.
4. This is not a control equipment, but a safety instrument.
Use the alarm contact from this monitor only for an external alarm light or buzzer.
And the analog output signal shall be used only for an external indicator or recorder.
We do not assume indemnification for any accident or damage caused by other
control purpose than the above.
5. Gas sampling from places where there are high humidity, dust or acid mist requires
sample pre-conditioner.
Please consult our nearest agent or Riken Keiki for such applications.
6. For maintenance, replacement parts listed in this manual and adjustments are
required.
We also recommend to perform regular maintenance including gas calibration in every
6 months as this is a safety instrument.

2
６．KIND OF ALARM AND ITS ACTION
６－１ Kind of alarm ……………………………………………………………… 30
６－２ Alarm action ……………………………………………………………… 30
６－３ Gas alarm (The unit with alarm setting)………………………………… 31
６－３－１ Responding to gas alarm……………………………………………… 31
６－３－２ Gas alarm possibility except the case of gas detection…………… 31
７．MAINTENANCE CHECK
７－１ Frequency of maintenance and check items …………………………… 32
７－１－１ Daily check …………………………………………………………… 32
７－１－２ Regular maintenance check ………………………………………… 32
７－１－３ Maintenance contract for regular check ………………………… 32
７－２ Replacing the parts ………………………………………………………… 33
７－３ Treatment when stopping operation or move its installation place … 34
７－３－１ Stopping the normal operation ……………………………………… 34
７－３－２ Changing the installation place ……………………………………… 34
７－４ Storage or treatment when not in use for a long period and treatment
for re-use………………………………………………………………… 34
７－５ Recommendable spare parts for regular maintenance ………………… 35
８．RESPONDING TO THE ABNORMAL CASE
８－１ Trouble alarm ……………………………………………………………… 36
８－２ Responding to the trouble ………………………………………………… 36
８－３ Before it is thought to be trouble………………………………………… 36
８－４ Troubleshooting……………………………………………………………… 37
９. DEFINITION OF TERMS……………………………………………………………… 39
１０.DETECTION PRINCIPLE …………………………………………………………… 40
１１．LIST OF PRODUCT SPECIFICATIONS
11－１ Standard specifications …………………………………………………… 41
11－２ Product compositions ……………………………………………………… 42
11－３ List of detection gas and range …………………………………………… 42

5
２－３．Caution items
○ Do not use a walky-talky around the instrument.
The indication might be affected by the electric wave generated by the walky-talky if it is
used near the instrument. When the walky-talky is used, be away enough from the
instrument not to affect.
○ Take at least 5 seconds interval when re-turning the power on.
Normal operation cannot be performed if the power is re-turned on within 5 seconds.
○ Confirm the float of the flowmonitor is within two red bars.
If the float is not within the red bars, the correct gas detection cannot be performed.
Adjust the flow rate.
○ Equip a dust filter to the instrument if it is used in a dusty place.
○ Do not use this monitor to control other equipment by use of output from this monitor.
This is not a control equipment.
Do not connect outer equipment for control purpose.
CAUTION

7
① ＬＣＤ display : Displaying gas concentration and various messages.
② Flowmonitor : To confirm the suction flow.
③ Dust filter : To remove the dust containing in the sampled gas.
④ Gas inlet : Sampled gas inlet to this monitor.
⑤ Fuse holder : 2A fuses are mounted.
⑥ Gas outlet : Sampled gas outlet from this monitor.
⑦ Power switch : ON/OFF switch for power supply
⑧ Terminal plate（3P）: Terminal strip for power source.
⑨ Terminal plate（8P）: Terminal strip for outputs/relay contacts.
⑩ Calibration gas inlet: Inlet for canned calibration gas(zero/span adjustments).
・Put the cap onto calibration gas inlet in case you do not
use calibration gas.
CAUTION

11
Do not install at the place where the sample gas is deposited.
Correct measurement will not be performed.
For instance, following consideration is required for CO2 measurement. Since CO2
gas coutains approx 300～800ppm in atmosphere, zero adjustment shall be done by
Nitrogen(N2) instead of atmospheric air. It zero adjustment is done by atmospheric
air, detection error, especially for low measuring range, will be high.
This detector requires regular maintenance.
Do not install the detector where it is attended with danger at maintenance work.
・ It is required to make regular maintenance. Do not install it where it will be danger for
maintenance such as near the high electric power cable, et.
Do not install the detector at places where;
* It is required to stop operation of the equipment where gas detector is installed at
maintenance work.
* It cannot make maintenance without taking off a part of equipment.
* Casing cannot be removed by pipings, rack, etc.
Be sure to ground when install.
Do not install it in an equipment that grounding construction is not enough.
Do not install it where it is difficult to make maintenance.
Do not install it where it is attended with danger at maintenance work.
Do not install it where it will be danger for maintenance work.
Do not install it where the target gas is deposited around.

13
（２）Designing to consider radiation
When install the closed self-standing control panel, mount the fans in the upper
and lower part.
（３）Lightning measures
Lightning
surge
There is the problem “Lightning”. When make outdoor wiring of cable at factory
or plants etc or when make a parallel wiring in the same duct with the cable in
from outdoor even at the indoor wiring. If the lightning is a huge generation
source, the cable is a reception antenna and there is the case that cable
connecting instrument is broken. It is impossible to prevent the generation of
lightning. If the cable should put in metal tube or laid in the underground, it is
impossible to prevent the inductive lightning surge generating from the thunder.
Lightning
measures
There is not the complete countermeasure for it but the following method can be
considered.
Make the suitable treatment accordingly.
a)The transmission signal route is arranged for connection by the optical fiber
cable etc.
b)Countermeasure by the lighting arrester (Cable safety retainer). There is the
way to install the lightning arrester just before the field apparatus and the
central control station. The position of the lightning arrester installation is at
each point of cable laid out from the outdoor to the indoor. The lightning
arrester builds in the circuit to remove the surge voltage to be the source for
the damage of field apparatus (Protection resistor, zero diode etc.) and is
designed to protect the apparatus. But as the signal may be attenuated due
to the lightning arrester, check the action and it is required to use.
Grounding Surge noise shall be generated from the thunder lightning or except it.
To protect detector from these cause, be sure to make grounding.
（４）Protection of alarm contact
・Alarm contacts shall be used only for external buzzer and alarm light, and do not use
it for the controlling use (such as solenoid valve control etc).
CAUTION
・The each relay contact for WARNING, ALARM and TROUBLE is set at OFF(not
functioning) as a standard version.
・Normally-closed contact (Break contact) at de-energized condition may change to
open contact in a moment due to physical shock.
・Whenever alarm signals from gas detectors are used with normally-closed
contact, please put delayed-circuit (for about one second) to receiver side of
normally-closed contact to avoid such phenomenon.

14
When control the external load, the bad influence may be given to the system according to
the load characteristics. In such case, the following countermeasure shall be taken to
stabilize the action and protect the contents.
・Relayed by the low voltage relay and operate by connecting CR circuit (Spark Killer: SK)
(Diode etc for DC) suited for relay coil directly to relay.
C L
SK O SK O
I R
L D
Ｖ
Ｖ
－How to think alarm contacts against inductive load－
The specification for alarm contact is described by the conditions of resistive load.
When use the inductive load for alarm contacts, the very high reverse electromotive
voltage may be generated and the following trouble tends to be produced.
・Contact part of relay is melted adhesively and the contacts can not work.
・High voltage is put inside of this monitor and then, electrical parts may be damaged.
・As it is big noise, the trouble action may be taken by the reckless drive of CPU.
CAUTION
・The inductive load shall not be connected in principle (Do not connect fluorescent
lamp, motor, etc.).
・When use the inductive load, make the contact amplification outside. But as the
outside relay coil belongs to the inductive load, use the relay driven by the low
voltage (within AC100V) and it is protected by an appropriate surge killer.
* As the inductive load, there are following samples.
・Revolving light ・External relay ・Buzzer ・Siren ・Fan ・Fluorescent lamp
・Motor etc.
・Add CR circuit to the load side of relay on the request.
・It may be better to add CR circuit to the contact side depending on the load.
RI-557
Alarm
contact
Power supply
Power supply Relayed relay
(Low voltage relay)
◎
ＳＫ：Surge absorption filter
RI-557
Terminal
◎
＊ NOTE

15
４－５．Grounding
Be sure to make grounding before putting on the power.
Use the power cord(3P) or earth terminal at the rear side of this monitor
when make grounding.
４－６．Caution in wiring
Be sure to make grounding for safety purpose and to keep stable operation of
this monitor. Do not connect each wire with gas pipe. Make grounding
corresponding to D-class grounding (Grounding resistance : below 100 Ω)
CAUTION
・Do not lay down the power cable and signal cable together with motive cable.
WARNING

16
４－７．Applicable cable
４－７－１．Power cable
Use the power cable supplied with the unit.
４－７－２．Output signal(4～20mA)
Use the CVVS shielded cable or equivalent.
４－７－３．Cable for alarm contact
Use the VCTF 0.75mm2 cable or equivalent.
４－７－４．Specifications of terminal plate
【Specifications of terminal plate】
・ Rated voltage ： 250VAC
・ Rated current ： 15A
・ Port size ： M4
【Suitable cable】 ： MAX.1.25mm
2
４－８．Arrangement of terminal plate
WARNING ALARM TROUBLE Signal output
Output Output Output 4-20mA or
(Optional) (Optional) (Optional) 0-1V(Optional)
Power supply
100VAC 50/60Hz
or
220VAC 50/60Hz(Optional)
・Set the terminal cover after wiring to avoid electrical shock.
DANGER

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４－９．Caution in piping works
(1) Piping to this gas monitor
Connection port for sample gas inlet provides a φ7 hose nipple. Use the φ6 (ID) hose.
Connection port for sample gas outlet provides a φ6 hose nipple. Use the φ5 (ID) hose.
The each length of hose for inlet and outlet shall be within 10m.
(2) Sample flow rate
The sample flow rate is approx 0.8～1.2L/min. in operating temperature range.
(3) Dust filter
Be sure to connect the dust filter supplied with accessories to the gas inlet port.
(4) Selection of piping material
・ There are some high adsorptive gases in sample gas. Select the proper piping material by
considering the kind of sample gas.
・ Select the proper piping material by considering the co-existing gas and moisture.
・This unit is designed to sample the ambient gas in an atmospheric pressure.
If the excessive pressure is added to gas inlet port and outlet port, it is dangerous
that inner tubing will be disconnected and gas will be leaked.
Use this unit not to adding excessive pressure.
・Connect the tube for exhaust gas to the gas outlet (GAS OUT) and exhaust the sampled
gas to be the safety place.
WARNING
・Do not use this monitor in a high corrosive atmosphere.
CAUTION