Operation Manual of JCB4 Methane Detection
Contents
1. 3 Setting alarm point Under setting state to adjust by using Voltage or On Off key till the digital tube shows 3 then confirm it by pressing Setting key and the detector enters into alarming point setting mode after hearing a sound Here the value shown in digital tube is the one adjusted last time To adjust the value to the needed setting by using Voltage or On Off key then confirm it by pressing setting key and exit the alarm point setting mode to the setting mode 4 Recovery original setting Under setting state to adjust by using Voltage or On Off key till the digital tube shows 4 then confirm by pressing setting key and all the parameter of the detector recover as it is leaving factory after hearing a sound 5 Exit setting state After all parameter adjustment finishes and back to setting mode to press Voltage or On Off key till the digital tube shows 0 then press setting to confirm it It exits the setting state when hearing a sound and here the digital tube shows concentration value of present methane 6 Under setting state the detector will automatically enters into methane measuring state if no any operation is taken over 5 minutes The digital tube shows concentration value of present methane 3 Methane measurement When it is opened up the detector enters into methane measuring state automatically and digital tube shows concentration valu2. not adjust the value as same as type sample methane because of long term usage It should be re adjust after replacing the element G Whole set 1 Methane detection alarm Ipc 2 Leather coat Ipc 3 Charger Ipc 4 Operation Manual Ipc H Transportation and storage 1 It can be transported by all kinds of means which including land carriage water carriage and air parcel It should avoid impacting heavy pressing raining and avoid mixing with corrosive 2 It should be stored in well ventilation no corrosive gas no dropping and liquid attack warehouse of which relative humidity is no more than 90 temperature is between 0 C 40 C I Unpack and check Open the package to check the whole set according to Clause 7 required in this manual J Warranty We guarantee the quality of the detector within 12 months except for the carrier catalytic element from the date when it is sold and would be responsible to repair it free in charge for any non man made damage during the period except for any damage from force majeure e g natural disasters war etc Manufacturer reserves the rights to change content of manual operation Appendix Operational diagram of system Menu Open up and automatic self inspection after 3 seconds Concentration display l Shows ERR because the cleanliness in air doesn t meet requirements stop adjust zero show 1 of To Show value Calibration Voltage ke
3. Operation Manual of JCB4 Methane Detection Alarm 20090523 A Summarization 1 Characteristics and application JCB4 Methane Detection Alarm short for methane alarm adopts micro processing technology characterizing in small light easy operation and convenient maintenance All calibration parameters and linearity correction are finished by software It is applicable to detect the concentration of the methane in the working environment where inflammable and explosive mixed gases exist 2 Type marking J C B 4 IEE Measuring Range Alarm heat catalysis Methane 3 Standard AQ 6207 2007 Portable Carrier catalysis Methane Detection Alarm Q SD 021 2008 JCB4 Methane Detection Alarm B Working principle and Structure 1 The structure of JCB4Methane Alarm is as below figure 1 13 1 Upper cover 2 PVC mask 3 Power switch key 4 Mouth of gases mark 5 Thermocatalysis component 6 Component protection cover 7 Circuit board 8 Lower casing 9 Battery pile 10 Current limiting resistor 11 Charging bolt 12 Buzzer 13 Nixietube display screen 14 Fast fuse Figure 1 2 Working principle Block graph of working principle for methane alarm see figure 2 While methane alarm is in methane gas environment the methane gas enters into component protection cover through the transom window of lower casing The flameless combustion occurs on the surface of the component inside
4. arm impact shuts off automatically after the buzzer alarm once protection Low voltage alarm When the battery voltage lower than 3 3V alarm lamp twinkling When the battery voltage lower than 3 1V the methane alarm shuts off automatically after the buzzer alarm once Esplosiom Intrinsically safe and flameproof for mining explosionproof mark Exibd I protection Dimensions 101x51x23mm Weight lt 0 2kg Working 1 Working temperature 0 40 C 2 Relative humidity lt 98 at 25 C condoni 3 Air pressure 68 116 KPa 4 Wind speed 0 8 m s 5 Underground coal mine with explosive gases D How to use 1 Function key press Key press distribution as Figure and its function is as below 1 On off key Press it for a while when the detector is under shutdown mode then the detector open up Press it for a while when the detector is under open up mode but not setting mode then the detector close down When the detector is under setting mode this key is used as data degression key 2 Voltage key To press this key to show battery voltage when the detector is under openup mode and it is used as increase key when the detector is setting adjusting 3 Setting key Press voltage and setting for 3 seconds when the detector is under open mode then the detector turns into setting mode It is used as confirming key when the detector is setting and adjusting 2 System set
5. atalytic Decline of resolution poisoned element F Important hints 1 Please read this user manual seriously before using and operate it correctly 2 There should be specific personnel to maintain the equipment and use it strictly according to user manual It is prohibited to disassemble it at will 3 During period of using and carrying it in the leather coat please keep it clean and protect it from severe hit 4 It is prohibited of existence of such chemical substance as organosilicon and binder Because such substance will cause poisoning of the catalytic element 5 The carrier catalytic element and battery components are explosion proof parts So it is prohibited to change their specification and parameter while repairing and replacing It should be maintaining and replacing by specific personnel and use spare parts supplied by the manufacturer 6 The adjustment should be carried periodically usually once a week 7 It is strictly prohibited to disassembly it underground mines 8 The intelligent charger for the methane detector is a product without explosion proof feature so it is prohibited to be used underground mines 9 It is strictly prohibited to change the intrinsic safety circuit and the model specification of the elements which concern with the intrinsic safety circuit It is strictly prohibited to use battery which not include in the operation manual 10 It proves that the catalytic element end its life when can
6. e of methane 4 Battery voltage measurement Under opening state to press the Voltage key for a while the digital tube shows battery s voltage To loose it 0 5 seconds later the detector will enters into methane measuring state automatically 5 Charging There is specific and intelligent charger to charge up the detector and the charging process is automatic To plug the charger into AC 220V when it need to be charged the indicating light turns into orange showing the power supply is connected Then put the detector block into the charger slot the indicating light turns into red showing the charging process begins It is charged full when the indicating light turns into green E Ordinary faults analysis and debugging See table 2 Table 2 Over low voltage or ineffective for the battery To charge or replace the battery Unable to open To re weld it after finding out Poor contact for the battery the reason There is combustible gas in the Put the detector into Unable to adjust zero ed clean air Failure on key press Replace a thin film switch There is sound but no light LED damaged Replace the LED while alarming There is light but no sound Buzzer damaged Replace the buzzer while alarming Time of continuous work is Insufficient battery capacity Recharge the battery less than 9 hours Aged battery Replace the battery i Aged carrier catalytic element or Replace the carrier c
7. the protection cover carrier catalytic components therefore its resistance value increases The Wheatstone bridge composed of carrier catalytic components and resistor loses balance and outputs voltage signal The voltage signal is positive proportional to methane concentration Magnified by linear magnifier the signal is input into the A D converter inside the singlechip and then processed by the micro processor and shown as methane concentration by digital tube The methane alarm emits voice amp light alarm while methane concentration value exceeds set alarm point Alarm lamp Josu s ULyz Jat flusey Ie ur dyo afsurs Overrange Protective Circuit 2 8V Power Supply Battery pack Figure 2 C Main specifications See Table 1 Table 1 Item Specification Measuring 0 00 4 00 CHs range Detecting tang 0 1 00 1 00 3 00 3 00 4 00 Tolerance Allowed ies 0 10 True value 10 0 30 tolerance Alarm point Set at will in 0 50 2 5 CH Original set 1 00 CH Response aa time iene Resolution 0 01 CH4 Carrier catalytic Working voltage of Carrier catalytic element is 2 8V Working current lt 100mA element Display mode 3 digital LED AA type 1800mAH 3 6V Ni Mh Battery pack inside connect 1 50 16W Paty Dace current limiting resistance in series over range methane When concentration of methane is gt 4 50 nixietube twinkling the methane al
8. ting and adjustment See appendix Operation diagram of system Menu Before setting or adjustment the detector should be open up for 10 minutes preheat or under stable state 1 Zero adjustment Press voltage and setting key for 3 seconds at the same time the detector enters into setting state and the digital tube shows 1 Then confirm the setting adjustment finishes when hearing a sound Note The process of zero adjustment should be taken in clean air It is prohibited to adjust zero when the air cleanliness does not meet requirements and the digital tube will show ERR 2 Calibration Under setting state to adjust by using Voltage or On off key till the digital tube shows 2 then confirm by pressing setting key and the detector enters into calibration state when hearing a sound And here the value shown in digital tube is the one set last time To adjust a value of this time by using Voltage or On off key confirm by pressing the setting key to back setting state Note 1 The calibration should be taken after standard gas enters into stability The flux of standard gas sample should be 200ml min 2 It must be for the adjusted value the same as of standard gas sample otherwise the measuring accuracy would be influenced 3 It is prohibited to take calibration before input standard gas sample If wrong operation is taken please recover it as per clause 4 recovery setting
9. y Shows 2 last time adjust by voltage Alarming point setting Show value of To Voltage key Shows 3 last time adjust by voltage t or On off recover defaultin Voltage key _ _ _ Shows 4 Cc Voltage key On Off key Shows 0
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