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New Cosmos Electric NV-100C, Instruction Manual

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New Cosmos Electric NV-100C Instruction Manual Download Page 28

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8. Maintenance 

and 

Inspections 

Maintenance and inspections are very important for the equipment because the purpose of the equipment is to secure 
safety. Maintenance and inspections are the users’ responsibility. We can offer regular inspections if you make a 
maintenance contract with us. (Contact our dealer / agency for detailed information.) 

8-1  Regular Inspections (Inspections that the users are responsible for)   

(1) Regular inspection (daily)

① 

Zero point check

② 

POWER lamp check

③ 

Flow inspection (for Suction type gas detector only)

(2) Monthly inspection 

④ 

Performance test by pressing the Test button 

⑤ 

Inspection of the backup power supply unit (when the equipment has backup power supply) 

(3) Inspections that should be carried out every two or three months 

⑥ 

Performance test using actual gas 

⑦ 

Visual inspection 

⑧ 

Situation around the gas detector 

Items to be inspected regularly and the inspection method

Items to be inspected 

Inspection method 

①

Zero point check 

・

Make sure that there is no gas around the gas detector then check that the bar 

graph on the indicator indicates zero. 

②

POWER lamp check 

・

Check that the POWER lamp (green) on the indicator unit is on. 

③

Flow inspection 

(for Suction type gas 
detector only) 

・

Check that the flow checker’s filter float has not gone down. 

It should be 0.7L/min or more. If the float has gone down, check if the filter is 
clogged. 

④

Performance test by 

pressing the TEST button 

・

Press the TEST button on the indicator unit and check that the bar graph on the 

indicator operates, the ALARM lamp blinks, and a buzzer is heard from the 
alarm unit. 

⑤

Backup power   

source device inspection 

(Equipment with a backup power 
source device only.)

・

Refer to 7-2(6) battery’s life check 

Note that connected the external alarm or lamp go on when the TEST 
button on the indicator unit is pressed. 

CAUTION 

Summary of Contents for NV-100C

Page 1: ...100C Instruction Manual Keep this instruction manual where it is readily accessible Thoroughly read this instruction manual before using the equipment so it can be used safely and correctly New Cosmos Electric Co Ltd Instruction manual No GAE 009 01 December 2004 ...

Page 2: ...es when the equipment has a backup power source １８ 7 6 Maintenance Function １９ 8 Maintenance and Inspections ２６ 8 1 Regular Inspections Inspections that the users are responsible for ２６ 8 2 Maintenance inspections Contact our dealer agency for the inspection ２７ 8 3 Preparation of Calibration Gas When isobutene 0 72vol 40 LEL ２８ 8 4 Replacing the Gas Sensor ３０ 8 5 Replacing the Filter suction type ...

Page 3: ... the said laws and regulation before installing or operating the equipment Installing wiring and other works concerning the equipment should be carried out by qualified persons following all applicable federal state and local health and safety laws and regulations including OSHA WARNING MEMO CAUTION DANGER Operation checks using actual gas are very dangerous because combustible gas may explode and...

Page 4: ... gas detector head 2 3 4mm 1 ea Lshaped wrench For Suction type gas detector head 2 4 5 8mm 1 ea Parts to embed the panel embedded panel only 1 Air filter FC 32 with flow checker for Suction type gas detector head only 1 Sample gas collector PE N3 for Suction type gas detector head only 1 NV 100C instruction manual this book 1 Test results of the equipment 1 Options separately sold KW 15 for Diffu...

Page 5: ...plosion proof construction Install it in a non hazardous area CAUTION One gas detector either diffusion or suction type gas detector can be connected Use a rainproof cover option if you install the equipment outdoor The number of cores of cables differs according to the gas detector head connected MEMO Indicator and alarm unit NV 100C Suction type gas detector PE 2DC Diffusion type gas detector KD...

Page 6: ...it with a backup power source 1 2 RESET BZSTOP POWER ALARM BACKUP H G F E S R PA PB 5 0 TA ZB2 ZA2 ZB1 ZA1 COM N AR AS TB BZ 15 2 9 10 3 11 5 4 26 27 12 6 8 28 1 14 13 7 29 18 19 20 21 23 22 2 φ6 24 25 113 71 5 17 16 C D A SET 0 6 4 2 10 8 1 2 RESET BZSTOP POWER ALARM BACKUP H G F E S R PA PB 5 0 TA ZB2 ZA2 ZB1 ZA1 COM N AR AS TB BZ ＦＵＳＥ 30 31 32 3 φ6 70 110 C D A SET 0 6 4 2 10 8 ...

Page 7: ...ram Usually it is not used 14 Program switch Use to write in the program Usually select the left side 15 Power switch Aswitch to open close the equipment s power source 16 AC power source fuse φ5 2 20L1Aglass fuse 17 Jumper pin It is used for various settings No setting by customer is necessary 18 Sensor signal check terminal SIGNAL Aterminal to check gas sensor signals 19 Sensor current check ter...

Page 8: ...nd 1 7 M5phexagon socket head bolt 3 6 M4phexagon socket head bolt 1 5 Guard mount 1 4 Sensor guard 1 3 Sensor unit 1 2 Terminal box cover 1 1 Terminal box 1 Descriptions Q ty Remark Fig 4 Diffusion type gas detector head KD 5 N Refer to the instruction manual for KD 2A KD 3Awhen use gas detector head KD 2A KD 3A MEMO 2 1 8 5 4 3 9 15 6 14 94 67 78 10 13 12 11 7 99 42 53 46 2 9 15 oval hole ...

Page 9: ...rminal block 1 7 Suction pump 2 6 Sensor element 1 5 Mount 1 4 Half joint 2 3 Gap plate 2 2 Terminal box 2 1 Detector main body 1 Descriptions Q ty Remark Fig 5 Suction type gas detector head G3 4 1 122 146 Grounding terminal P A A B 4 7 177 137 348 135 96 76 20 34 49 ...

Page 10: ...otifying others in case of an alarm is possible Do not place the indicator and alarm unit in a place with vibration electric noise or corrosive gas Avoid places with a high temperature or humidity as well CAUTION As to the gas detector to be connected refer to its instruction manual MEMO Size of mounting holes is different if the equipment has a backup power source If the equipment has no backup p...

Page 11: ...quipment can be attached to a 1 6 to 6 mm thick panel Fig 7 Dimensions to Cut a Panel Fig 8 Embedding on a Panel Leave a 30 cm space under the equipment s body for maintenance work If the equipment has a backup power source also leave a 30 cm space on the right side of the equipment for changing batteries MEMO 110 200 Attaching screw Equipment Equipment Without abackup power source Witha backup po...

Page 12: ...ith silicon compounds as silicon could poison and or impair the sensitivity of the sensor The gas detector should be installed in a location free from vibration Avoid severe shocks and or mechanical impact to the gas detector When the gas detector is to be installed in an outside location make sure to use a rain protective cover or cap Use Auto drain function optional item when use the Suction typ...

Page 13: ...to fix How to install the rainproof cover optional item and rainproof cap optional item Fig 10 How to install the fixing plate Fig 11 KW 15 KW 22 installation Fix on the wall with attached the M6 hexagon bolt andthe nut Tighten thescrewto fix Rainproof cover KW 15 Rainproof cap KW 22 Fixing plate saddle Fixing plate stand Pan head screw ...

Page 14: ... or less And the gas detector head should be installed in a location where is easy to access for maintenance Example locations to install Installation for Rainproof cover PW 51 Fig 12 Example location to install Suction type gas detector head Fig 13 Example installation for PW 51 Gas collecting pump should be installed at high location where is free from sucking water CAUTION Drain pit Alocation w...

Page 15: ...Gas concentration around the gas detector can be continuously monitored and recorded by connecting a recorder to the analog output terminal There are G and H terminals on the terminal block Standard output is 4 20 mA Input resistance of the recorder should be 500Ω or less Turn OFF the indicator and alarm unit s power before opening the cover of the gas detector Opening the cover when the power is ...

Page 16: ...ternal switch Control device Upper terminal block Lower terminal block Analog output 4 20mA 1 5V Grounding Grounding 6C cable Suctiontype PE 2DC Breaker COM N AR AS ZA1 ZB1 ZA2 ZB2 TA TB BZ A B C D F G H E PA PB R P S N 制御機器 外部スイッチ 空 上段端子台 下段端子台 B ｱﾅﾛｸﾞ出力 4 20mA 遮断器 AC100 200V DC24V 接地 1 5V 拡散式ガス検知部 接地 E C A 3Cｹｰﾌﾞﾙ KD 5 N External switch Control device 3C cable Breaker Grounding Diffusion type KD...

Page 17: ...RR 3 Zero adjustment 1 Correction by the auto zero function The reading is automatically corrected to zero by pressing the button Use this adjustment daily for minor zero point corrections Refer to 7 6 1 2 Analog zero adjustment Adjust zero by turning the zero adjustment volume Use this method for most zero adjustments Refer to 7 6 2 3 Zero suppression mode The indicator sometimes flickers when in...

Page 18: ...ltage 7 Checking analog output Terminal block G and H can output 4 20 mA 1 5V Connect a tester to terminal block G and H Adjust the indicated value at zero using the Test control while pressing down the Test button Check output on the tester You do not need to adjust if it reads 4 mA 1V If it is off adjust by turningAnalog OutputAdjustment control L Adjust the indicated value at full scale using t...

Page 19: ...re Failure E Sensor failure H Sensor heater wire failure F Flow decline 2 When the Buzzer Stop BZ STOP key is pressed When the BZ STOP key is pressed the alarm sound stops 3 After the failure has been fixed The Power lamp changes from orange to blinking green and the equipment goes into warming up state After warming up it returns to its normal state 5 Equipment with a backup power source 1 In cas...

Page 20: ...ch the battery connector and take out the batteries Insert new batteries and attach the connector Put the battery cover back If you change setting for function switches the equipment cannot perform as it is supposed to for example alarm does not go off even when there is gas leakage Do not change setting unless you completely understand features of Function switches CAUTION When gas leaks indoors ...

Page 21: ...d Alarm contact and buzzer contact do not operate 3 9 Only used for adjustment at factory Do not use them When adjustment in a mode is completed always set the Mode switch at zero to return to normal mode If the switch is left at other mode the equipment cannot alarm gas leakage correctly Message window displays preset value and alternately during maintenance mode to prevent you from forgetting to...

Page 22: ...t the Mode switch at zero to return to normal mode If the indicated value is outside the auto zero adjustment range when the BZ STOP key is pressed the message window will display a blinking Err indication and auto zero adjustment will be impossible If this occurs carry out analog zero adjustment in maintenance mode 2 MEMO POWER ALARM 2 1 RESET BZSTOP BACKUP 40 POWER ALARM 2 1 RESET BZSTOP BACK UP...

Page 23: ... until the Power lamp goes off The Power lamp lights up again and the peak hold value is automatically corrected to the auto span preset value Set the Mode switch at zero to return to normal mode POWER ALARM 2 1 RESET BZSTOP BACKUP 40 POWER ALARM 2 1 RESET BZSTOP BACKUP 40 Auto span preset value POWER ALARM 2 1 RESET BZSTOP BACKUP 40 POWER ALARM 2 1 RESET BZSTOP BACKUP 40 Peak hold Off POWER ALARM...

Page 24: ...ons with the auto zero and span functions and the zero suppression function cancelled Therefore the indicated values in this mode may differ from those in normal mode Always reset auto zero and span adjustment values during analog zero or span adjustment If you fail to do so zero and span adjustment cannot be carried out correctly Indicated values with linearization cancelled are displayed while t...

Page 25: ... Set the Mode switch at 2 to select maintenance mode 2 Press down the reset key until the Power lamp goes off POWER ALARM 2 1 RESET BZSTOP BACKUP On POWER ALARM 2 1 RESET BZSTOP BACKUP Adjust to zero POWER ALARM 2 1 RESET BZSTOP BACKUP Check to see if the indicator reads 0 Always perform analog zero adjustment before doing analog span adjustment Otherwise the span cannot be adjusted properly when ...

Page 26: ...while pressing the test button to match the indicated value to the peak hold value Then turn the span control SPAN to match the indicated value to the calibration gas concentration value POWER ALARM 2 1 RESET BZSTOP BACK UP Peak hold value On POWER ALARM 2 1 RESET BZSTOP BACKUP POWER ALARM 2 1 RESET BZSTOP BACKUP Match to the peak hold value POWER ALARM 2 1 RESET BZSTOP BACKUP Match to the calibra...

Page 27: ...ion is indicated correctly POWER ALARM 2 1 RESET BZSTOP BACKUP Check that the reading returns to zero POWER ALARM 2 1 RESE T BZSTOP BACKUP Return to the full scale Note that a gas leak alarm and external output will be generated when calibration gas is applied in normal mode CAUTION POWER ALARM 2 1 RESET BZSTOP Make sure that there is no gas around the gas detector and check to see if the indicato...

Page 28: ...tion Situation around the gas detector Items to be inspected regularly and the inspection method Items to be inspected Inspection method Zero point check Make sure that there is no gas around the gas detector then check that the bar graph on the indicator indicates zero POWER lamp check Check that the POWER lamp green on the indicator unit is on Flow inspection for Suction type gas detector only C...

Page 29: ...e inspected Inspection method Sensor s current inspection Refer to 7 2 Procedures 2 Zero point adjustment Refer to 7 2 Procedures 3 POWER lamp check Refer to POWER lamp check about daily inspection Preset alarm value Check that the preset alarm value mark on the indicator unit s bar graph is at the proper value Refer to 7 2 Procedures 4 Flow inspection Suction gas detector only Refer to 3 on Table...

Page 30: ... If you have a standard gas cylinder Fill a gas bag with standard gas as shown in Fig 17 Completely vacuum the air from the bag before filling the gas because the air in the bag may cause an error of the gas concentration 2 If you do not have a standard gas cylinder Make 0 72vol 40 LEL calibration gas by diluting pure gas isobutane 99 with the air using the calibration equipment kit Replace an exp...

Page 31: ...l Making diluted gas Connect an empty gas bag to the outlet of the quantitative pump then push in the pump s piston Move the piston back and forth nine times to add air in order to make diluted gas Fig 18 Making Standard Gas from Raw Gas If you take 7 2ml of raw gas and move the quantitative pump s piston back and forth ten times a back and force motion 100ml 7 2ml 100ml 10 0 0072 0 72vol diluted ...

Page 32: ...djustments after replacing the sensor unit Refer to 5 6 Maintenance Function 1 and 3 Fig 19 Calibration Equipment Kit for KD 5 Turn OFF the power of Indicator Alarm unit before opening the cover of the gas detector Opening the cover of the gas detector when the power is on may cause a fire WARNING Fig 20 Replacing the Sensor of a Diffusion Gas Detector instruction manual rubber pipe quantitative p...

Page 33: ...them back onto the detection compartment Set the gas sensor holding board onto the detection compartment in the correct direction Attach the crimp style terminals of gas sensor cables and lead in cables to the trunk terminals Close the electric compartment s cover then tightly fasten it with the hexagon socket head bolts M10 25 Turn ON the power of the Indicator Alarm unit and carry out zero adjus...

Page 34: ...may decrease flow Loosen the fastening ring and detach the cup and O ring Detach the dirty filter by turning and twisting it Wash the inside of the cup with water and completely dry it Press a new filter in and upwards as far as it goes to attach it Attach the cup and O ring then fasten the fastening ring Fig 22 Replacing the Filter of a Flow Checker FC 32 float OUT filter element O ring cup faste...

Page 35: ...ashers are attached in their correct positions Turn OFF the power of the main body before cleaning the gap plate in order to prevent a fire or explosion WARNING Be careful not to damage the joints of the gap plate or the side of the electric compartment Damage to these parts decreases the equipment s explosion proof properties CAUTION If you need to detach the filter with a flow checker to carry o...

Page 36: ...e Power lamp lights up when the Power switch is turned ON gas concentration is not displayed Mode switch is not set at zero Set the Mode switch at zero Refer to 7 6 The equipment and the gas detector are not properly connected Check the wiring and re tighten the terminal Refer to 7 6 The Power lamp lights up orange Gas sensor failure in the detector head Replace the gas sensor Refer to the instruc...

Page 37: ...tact capacity AC100V 2Aload resistance External reset terminal Terminals for external alarm stop and reset Analog output 4 20 mA standard 1 5 V Option Alarm delay Delay mode can be set Delay time About 10 seconds Zero suppression function Zero suppression mode can be set F S 5 Power source AC100 240V 50 60Hz standard DC24V Option Power consumption Diffusion type 12VA 17VA with a backup power sourc...

Page 38: ...parts and spare parts for NV 100C 12 Warranty New Cosmos Electric Company Limited warrants its gas detection products against any defects in materials and workmanship under normal use and operating conditions for a period of one year from the date of purchase All obligations and liabilities under this product warranty are limited to repairing or replacing at the manufacturer s option of the allege...

Page 39: ...alarm Alarm accuracy Difference between the preset alarm value and gas concentration when an alarm actually occurs or as the percentage of the difference compared to the preset alarm value Response time Time it takes from when the gas detector is exposed to a gas with a concentration higher lower than the preset alarm value until an alarm goes off Temperature range Range of temperature where the e...

Page 40: ...of this Operation Manual are available Contact the following address for ordering information Distributor Manufacturer New Cosmos Electric Co Ltd 2 5 4 Mitsuya naka Yodogawa ku Osaka 532 0036 Japan Phone 81 6 6309 1505 Fax 81 6 6308 0371 Email e info new cosmos co jp http www new cosmos co jp New Cosmos Electric Co Ltd ...

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