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OPERATION AND MAINTENANCE MANUAL
RIKEN OXYGEN GAS DETECTOR HEAD
Request for the Customers
•
Read and understand this operating manual before using the detector head.
•
Use the detector head in accordance with the operating manual.
•
Regardless of warranty period, we shall not make any indemnification for accidents and damage
caused by using this product.
The indemnification 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 any abnormality was found in the detector head, notify them to RIKEN KEIKI immediately.
FOR
GD-F4A-1
PT2E-1512
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Related Manuals for Riken Keiki GD-F4A-1
Summary of Contents for Riken Keiki GD-F4A-1
- Page 1 OPERATION AND MAINTENANCE MANUAL FOR RIKEN OXYGEN GAS DETECTOR HEAD GD-F4A-1 Request for the Customers • Read and understand this operating manual before using the detector head. • Use the detector head in accordance with the operating manual. • Regardless of warranty period, we shall not make any indemnification for accidents and damage caused by using this product. The indemnification 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 ...
- Page 2 [CAUTIONS ON OPERATION] This is a fixed type gas detector (head) and alarm instrument to detect oxygen gas in air. The gas alarm instrument 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 detector head correctly. 1. The indication on this detector has some changes against fluctuation of atmospheric pressure. Especially, take care about alarm action at the time of depression caused by typhoon. ...
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Page 3: Table Of Contents
TABLE OF CONTENTS １．OUTLINE OF THE PRODUCT １−１． Preface ……………………………………………………………………… 1 １−２． Purpose of use ……………………………………………………………… 1 １−３． Definition of DANGER, WARNING, CAUTION and NOTE ………………… 1 ２．IMPORTANT INSTRUCTIONS FOR THE SAFETY ２−１． Danger cases………………………………………………………………… 2 ２−２． Warning cases………………………………………………………………… 2 ２−３． Caution cases………………………………………………………………… 2 ２−４． Caution for explosion proof (In case of intrinsically safe design)…………… 2 ３．PRODUCT COMPONENTS ３−１． External drawing……………………………………………………………… 3 ３−２． Name of each part and functions…………………………………………… 4 ３−３． ... -
Page 4: １．Outline Of The Product
１．OUTLINE OF THE PRODUCT １−１．Preface Thank you for purchasing our fixed type Oxygen Detector Head GD-F4A-1. First of all, verify that the model number of this product is identical with specifications described in this manual. This manual is a guide to operation of the GD-F4A-1. All parsons who use this detector for the first time and who has ever used this detector are requested to read through the manual to understand the content before use. １−２．Purpose of use This is a suction(flow-through) type oxygen detector head applying the galvanic cell type ... -
Page 5: ２−１．Danger Cases
２. IMPORTANT INSTRUCTIONS FOR THE SAFETY ２−１．Danger cases DANGER In case of non-explosion poof system, do not use this unit at the place where combustible gas may exist. ２−２．Warning cases WARNING ・Do not cut the wire for protective ground both inside and outside of instrument. Or, do not disconnect the connection of the ground terminals. ・Before starting the operation, check if any defect is not found on the protective grounding. ... -
Page 6: ３．Product Components
３．PRODUCT COMPONENTS ３−１．External drawing Gas inlet Sensor Cable inlet Cable inlet Gas inlet Sensor Cable inlet Protective Gas outlet ground Gas outlet Protective ground 3... -
Page 7: ３−２．Name Of Each Part And Functions
３−２．Name of each part and functions ⑧ ④ ③ ⑥ ⑦ ① ② ⑨ ⑤ ① Oxygen sensor : Galvanic type sensor to detect oxygen content. ② Sensor retainer : This is a retainer to hold the oxygen sensor (equipped with filter inside). ③ Sensor lead : ... - Page 8 ！ WARNING １．The oxygen detector shall be used as following composition. Non-hazardous Hazardous area area Ｌｉ Ｌｏ Ｃｉ Ｃｏ Ｌｗ Ｃｗ Oxygen detector Safety retainer Ｌｉ≒ 0 Ｃｉ≒ 0 ≒ 0 shows a negligible value ２．The safety retainer to be connected with oxygen detector shall have linear characteristics and be passed the type approval as it is. Also it shall satisfy the following conditions. (1) Rating of safety retainer ...
- Page 9 (2) Non-explosion proof system Non-hazardous area Non-hazardous area Detector head CVVS-2C 1.25mm or equivalent (MAX 600m) (3) Component inside detector head Drip-proof housing Sensor lead Terminal strip Oxygen sensor Cable gland Gas inlet Shielded cable Gas outlet 6...
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Page 10: ４．How To Use
４．HOW TO USE ４−１．Before using the detector head All persons who use this detector for the first time and who has even used the detector are requested to follow all the instructions for use carefully. If not, the instrument may be defective and correct gas detection may not be performed. ４−２．Precautions for installation points When installing this detector, note the following points. WARNING Do not install the detector head and cable at the following points. ・Place to get direct rays of the sun. ・Places closed to high temperature and/or emission of electromagnetic wave. ... -
Page 11: ４−４．How To Install
2B pipe ４−４．How to install （O.D. 60.5mm） (1) Mounting to the wall surface Mount the detector head to a flat surface (wall surface, etc) with either M6 bolts or M10 bolts through mounting holes. Refer to 「3-1. External drawing」 for mounting pitch. (2) Mounting to the pole The unit can be mounted to the pole (2B pipe) U-bolt （Nominal by using the optional U-bolts shown in right diameter 50B）... - Page 12 (2) In case of intrinsically safe system You can build the intrinsically safe system by adding optional zener barrier between detector head and indicator/alarm unit. ① Lead the applicable cable through cable inlet and connect to the terminal strip. ② Connect the optional zener barrier between this unit and indicator/alarm unit at non-hazardous area. (See below fig.) ③ Connect the other side of the cable to the indicator/alarm unit side. ④ Connect the shield’s drain wire to ground on the indicator/alarm unit. max. 600m Zener barrier（MTL761Pac） １ ３ ４ ２ Connection cable Connection ...
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Page 13: ４−８． Caution At Piping Works
・ Be sure to put dust filter in front of gas detector. If sampled gas contains water and corrosive gases, removal device is required separately. ４−9．Example of piping connection Gas inlet/outlet fitting of this unit is Rc 1/8 female screw and provided with brass coupling. Applicable piping is φ8(O.D.)-1t copper pipe. Secure the piping connections not to leak. The piping material will be changed depending on corrosive gas contained in a sampled gas. In such case, contact RIKEN KEIKI Co., Ltd. (1) In case of pump suction GD-F4A-1 Detection point Gas OUT 1.0±0.3L/min Flow control valve Pump ... - Page 14 (2) In case of pressurized sample gas GD-F4A-1 Detection point Gas OUT 1.0±0.3 L/min Flow control valve Flow meter Dust filter (3) In case of aspirator suction GD-F4A-1 Instrumentation air Detection point Air consumption：1〜3NL/min Pressure：0.1〜0.34MPa ...
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Page 15: ５．How To Operate
５．HOW TO OPERATE ５−１．Preparation for start up Before making power on, take care of the following. If do not keep this, there is the danger of electrical shock and damage of instrument. WARNING ・ Make protective grounding. ・ Check that the wiring with outer unit is made correctly. ・ Check that the supply voltage is within the rating. ・ Check that the rated fuse is used. ５−２．How to start the detector head ① This detector head does not equip a power switch. Analog outputs of oxygen sensor are transmitted to the indicator/alarm unit directly through the connected cable. As far as the cable has been connected correctly, this system starts operation by putting on the power switch in indicator/alarm unit. ②... -
Page 16: ６．Maintenance
６．MAINTENANCE Gas detection and alarm instrument is kept in continuous operation over a long time and must perform a vital role as a safety device. For this purpose, periodical inspection must be made. The High-pressure Gas Safety Act in Japan sets forth the obligation of periodical inspection of the gas detection and alarm instrument. - Maintenance Contract ‒ Be sure to perform the regular maintenance since this is an instrument for security and safety. If this detector head founds defective, contact RIKEN KEIKI immediately. ６−１．Maintenance intervals and items The maintenance includes a daily maintenance which a person in charge of control and operation of the gas detection instrument performs maintenance before work once a day, and a monthly maintenance ... -
Page 17: ６−２．Calibration
６−２．Calibration Perform gas calibration at new installation, 6 months maintenance and sensor replacement. ６−２−１．Required kit and tools for calibration Prepare following jigs and tools to perform zero and span adjustments. • Calibration gas (standard gas for zero and span) • Gas sampling bag for calibration gas. • Gas sampling bag for exhaust gas. • Suction pump to lead calibration gas • Flow meter with flow control valve (enable to control 1.0L/min). ６−２−２．Performing a zero adjustment ① Pack the zero gas (Nitrogen more than 99.9 vol %) into gas sampling bag. ② Disconnect piping for both gas inlet and gas outlet of this unit. ③ Connect flow meter （with flow control valve） and suction pump to the detector head. Turn on the pump and adjust the reading of flow meter to 1.0±0.3L/min. ④ Connect gas sampling bag for calibration to the IN side of the pump and gas sampling bag for exhaust gas to the outlet of this unit respectively. ⑤ After reading by indicator/alarm unit gets stable, adjust the reading to zero with respective potentiometer of indicator/alarm unit. ... -
Page 18: ６−３．Replacing The Sensor ６−３−１．Replacement Intervals Of The Sensor
６−３．Replacing the sensor ６−３−１．Replacement intervals of the sensor To maintain the reliability of the measurement, it is recommendable to replace the sensor periodically. Our oxygen sensor has an enough life span. However, the actual life is depending on the operating conditions. Then, replace the sensor once a year as the tentative deadline for the replacement cycle. ６−３−２．How to replace the sensor ① Verify that the indicator/alarm unit is off. If the sensor is disconnected, the indicator/alarm unit issues an alarm. ... -
Page 19: ６−４．Storage Or Treatment When Not In Use For A Long Period
６−４．Storage or treatment when not in use for a long period Oxygen sensor is a kind of cell and will continue to consume its life even though it is not used. When detector head is not used for a long period, take out the sensor from detector head and store it at following environment to make lower the consumption of sensor. ... -
Page 20: ７．Measures At Abnormal Case
７．MEASURES AT ABNORMAL CASE ７−１．Responding to trouble alarm If this detector founds defective, contact RIKEN KEIKI. ７−２．Before it is thought to be a trouble It may be caused by cable disconnection, short circuit, etc. ・Check the wirings around the related instruments as well as this detector head. It may be caused by improper operation. ・Re-check the detection system and contact RIKEN KEIKI. ８．DEFINITION OF TERMS Galvanic cell Galvanic cell type oxygen sensor that produces a current proportional to the oxygen content permeated through the membrane. Refer to 「10. DETECTION PRINCIPLE」 for details. Zener barrier Safety retainer for explosion protection by limiting the energy of electric current within a non-ignition level. ... -
Page 21: ９．Product Specifications
９．PRODUCT SPECIFICATIONS ９−１．Standard specifications Model ： GD-F4A-1 Detection principle ： Galvanic cell method Target gas ： Oxygen in air Sampling method ： Sample-drawing(flow-through type) Signal transmission ： Sensor output direct transmission Transmission cable ： CVVS 1.25mm , 2C cable or equivalent Transmission distance ： Max 600m with CVVS 1.25mm , 2C cable (between indicator/alarm unit and detector head) Applicable zener barrier ： MTL 761Pac Cable entry ： Cable gland (Applicable cable O.D. : φ8〜φ11mm) Piping connection ： Rc 1/8, φ8-1t(Provided with coupling) ... -
Page 22: １０．Detection Principle
１０. DETECTION PRINCIPLE (1) Structure In a resin container, there are noble metal electrode as cathode and lead electrode as anode immersed in an electrolyte. A part of container is opened and put a membrane over there. A lead wire from each electrode (anode and cathode) is led to take out an electrical output across a temperature compensation thermistor net work. Structure of galvanic cell type oxygen sensor is shown below. Membran Gold electrode (Cathode) Lead electrode Electrolyte (Anode) Output terminal Thermistor Structure of galvanic cell type oxygen sensor (2) Working principle By connecting a noble metal and base metal electrodes immersed in an electrolyte with a lead wire, an electrochemical cell is formed. A membrane covers the cell and allows oxygen to diffuse into the electrolyte at a rate proportional to the partial pressure to oxygen where reduction on the noble electrode and oxidation on the lead electrode occur respectively as shown in the following chemical equations and produce a current between electrodes. ...
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