Halma Crowcon Xgard Скачать руководство пользователя страница 41 | Manualshive

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1.1 Flameproof flammable gas detector

This version of

Xgard

is a Flameproof gas detector, designed to detect

flammable gas present in ambient air, at concentrations not exceeding
the Lower Explosive Limit (LEL) of the target gas for which it is calibrated.

Xgard

Type 5 is powered by 24 V dc (nominally) and provides a 420 mA

signal (sink or source) proportional to the gas concentration. The detector
is certified

II 2 GD EExd IIC T6, and is suitable for use in Zone 1 and Zone

2 hazardous areas.

Electrical connections to the detector are made via the terminal block on
the PCB shown below.

Diagram 12:

Xgard

Type 5 PCB layout

(Shown with PCB cover removed).

1. Introduction

Xgard Type 5

VR3

Test

points

TP1

TP4

Srce

Sink

TP2

TP3

Supple
mental
external
grounding
terminal
(earth)

Internal
grounding
terminal
(earth)

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Содержание Crowcon Xgard

Страница 1: ...Installation operating and maintenance instructions Xgard Gas Detectors M07249 Issue 8 October 2007...

Страница 2: ...d when replacing cells to ensure that the electrolyte does not come into contact with skin or eyes Maintenance and calibration operations must only be performed by qualified service personnel Only gen...

Страница 3: ...se in Zone 1 provided they are connected via a suitable zener barrier or galvanic isolator Zone 2 An area classified as Zone 2 is not likely to have ignitable concentrations of flammable gases vapours...

Страница 4: ...ATEX and IECEx Intrinsically Safe Xgard Intrinsically Safe Type 1 UL Class I Groups A B C and D Haz Loc when installed in accordance with control CROWCON XGARD GAS DETECTOR TYPE 1 understand and adher...

Страница 5: ...on Xgard comprises of a universal assembly to accommodate the full range of toxic flammable and oxygen gas sensors The assembly comprises five main parts the junction box junction box lid amplifier te...

Страница 6: ...e entry 6 Overview Slots to suit M6 or 1 4 fixings 155 5 Overall Height 111 36 Slot CRS 146 CRS 166 3 Overall Slots to suit M6 or 1 4 fixings for ceiling mount All dimensions in millimetres Diagram 2...

Страница 7: ...applicable For part numbers not shown see Spares and Accessories on page 59 7 Overview Grub screw Grub screw Certification label PCB cover M04770 Enclosure base Sensor seal Sensor retainer O ring M04...

Страница 8: ...on 25 2 Installation 26 3 Operation 29 4 Specification 32 Type 4 Flameproof high temperature flammable gas detector 33 1 Introduction 33 2 Installation 34 3 Operation 37 4 Specification 40 Type 5 Flam...

Страница 9: ...one 2 hazardous areas when used with a suitable Zener barrier or galvanic isolator Electrical connections to the detector are made via the terminal block on the amplifier PCB shown below The amplifier...

Страница 10: ...damage caused by natural events e g rain or flooding For detectors mounted outdoors Crowcon recommend the use of a Spray Deflector Part No C01052 and accessory adaptor Part No M04666 Mounting of oxyg...

Страница 11: ...a voltage higher than the maximum rating of the Zener barrier typically 28 V Ensure there is a minimum of 8 V at the detector taking into account the voltage drop due to cable resistance the Zener bar...

Страница 12: ...be used where local authorities permit or require such a connection To limit radio interference the junction box and cable armour should be grounded earthed at the control panel Ensure the earth conn...

Страница 13: ...DVM to the test points on the amplifier PCB Note At the test points Zero will read 40 mV 4 mA Full scale deflection will read 200 mV 20 mA Zeroing the detector 6 Ensure you are in clean air Adjust the...

Страница 14: ...r board adjust the CAL pot until the DVM reads 174 mV 20 9 O2 Leave the LINK in RUN position and re fit the PCB cover 4 If the control equipment display requires adjustment consult the operating manua...

Страница 15: ...ector by unscrewing the lid in an anti clockwise direction having loosened the retaining grub screw first 3 Unscrew the sensor retainer and remove the sensor and sensor PCB 4 Fit the replacement senso...

Страница 16: ...or type Humidity 0 90 RH non condensing Degree of protection IP65 IP66 when fitted with a weatherproof cap Explosion protection Intrinsically Safe Approval code ATEX II 1 G EEx ia IIC T4 IECEx BAS 05...

Страница 17: ...se in Zone 1 and Zone 2 hazardous areas Electrical connections to the detector are made via the terminal block on the amplifier PCB shown below The amplifier provides power to the sensor and converts...

Страница 18: ...e g rain or flooding For detectors mounted outdoors Crowcon recommend the use of a Spray Deflector Part No C01052 and accessory adaptor Part No M04666 Mounting of oxygen detectors requires knowledge o...

Страница 19: ...here is a minimum of 8 V at the detector taking into account the voltage drop due to cable resistance and the sense resistance of the control panel to which it is connected For example a nominal dc su...

Страница 20: ...diagram 6 shall be used as the grounding means of the Xgard gas detector The external grounding terminal see diagram 6 is only a supplemental bonding connection and is only to be used where local aut...

Страница 21: ...a digital volt meter DVM to the test points on the amplifier PCB Note At the test points Zero will read 40 mV 4 mA Full scale deflection will read 200 mV 20 mA Zeroing the detector 6 Ensure you are in...

Страница 22: ...position and re fit the PCB cover 4 If the control equipment display requires adjustment consult the operating manual for the equipment 5 Follow steps 11 and 12 given in 3 1a above The detector is now...

Страница 23: ...having loosened the retaining grub screw first 3 Unscrew the sensor retainer and remove the sensor and sensor PCB 4 Fit the replacement sensor having checked that the part number matches that stated...

Страница 24: ...r type Humidity 0 90 RH non condensing Degree of protection IP65 IP66 when fitted with a weatherproof cap Explosion protection Flameproof Approval code ATEX II 2 GD EExd IIC T6 IECEx BAS 05 0042 Tamb...

Страница 25: ...Bridge WB circuit and must be connected to a suitable control card The detector is certified II 2 GD EExd IIC T6 for operation up to 50 C 120 F II 2 GD EExd IIC T4 for operation up to 80 C 176 F and...

Страница 26: ...air gases detectors should be mounted at low level When locating detectors consider the possible damage caused by natural events e g rain or flooding For detectors mounted outdoors Crowcon recommend...

Страница 27: ...Alternative cabling techniques such as steel conduit may be acceptable provided appropriate standards are met Maximum permissible cable lengths depend on the cable resistance and sensor being used It...

Страница 28: ...nction box The terminals are marked sig and and correct polarity should be observed when connecting the detector to control equipment This version of Xgard operates as part of a 3 wire mV Wheatstone b...

Страница 29: ...nstruction manual Zeroing the detector 6 Ensure you are in clean air Adjust the control equipment to read zero Calibrating the detector 7 Apply calibration gas concentration should be 50 LEL to the de...

Страница 30: ...stor has been exposed Under normal conditions 6 monthly calibration with periodic exposure to CAL gas the life expectancy is 3 5 years Site practices will dictate the frequency with which detectors ar...

Страница 31: ...ensor retainer and remove the sensor and sensor PCB 4 Fit the replacement sensor having checked that the part number matches that stated on the detector junction box label taking care to align the loc...

Страница 32: ...y 0 99 RH non condensing Degree of protection IP55 IP66 when fitted with a weatherproof cap Explosion protection Flameproof Approval code ATEX II 2 GD EExd IIC T6 Tamb 40 C to 50 C ATEX II 2 GD EExd I...

Страница 33: ...uitable control card The detector is certified II 2 G EExd IIC T3 and is suitable for use in Zone 1 and Zone 2 hazardous areas Electrical connections to the detector are made via the terminal block on...

Страница 34: ...uld be mounted at low level When locating detectors consider the possible damage caused by natural events e g rain or flooding Consider ease of access for functional testing and servicing Consider how...

Страница 35: ...the detector Crowcon recommend the use of steel wire armoured SWA cable and suitable explosion proof glands must be used Alternative cabling techniques such as steel conduit may be acceptable provide...

Страница 36: ...unction box The terminals are marked sig and and correct polarity should be observed when connecting the detector to control equipment This version of Xgard operates as part of a 3 wire mV Wheatstone...

Страница 37: ...it at the control panel if necessary Refer to the control equipment instruction manual Zeroing the detector 6 Ensure you are in clean air Adjust the control equipment to read zero Calibrating the dete...

Страница 38: ...l conditions 6 monthly calibration with periodic exposure to CAL gas the life expectancy is 3 5 years Site practices will dictate the frequency with which detectors are tested Crowcon would recommend...

Страница 39: ...id in an anti clockwise direction having loosened the retaining grub screw first 3 Loosen the terminals retaining the detector wires 4 Loosen the grub screw on the sensor retainer 5 Unscrew the detect...

Страница 40: ...ge Typically 10 mV per CH4 Minimum Operating temperature 20 C to 150 C 4 F to 302 F Humidity 0 99 RH non condensing Degree of protection IP54 Explosion protection Flameproof Approval code ATEX II 2 G...

Страница 41: ...and provides a 4 20 mA signal sink or source proportional to the gas concentration The detector is certified II 2 GD EExd IIC T6 and is suitable for use in Zone 1 and Zone 2 hazardous areas Electrical...

Страница 42: ...at low level When locating detectors consider the possible damage caused by natural events e g rain or flooding For detectors mounted outdoors Crowcon recommend the use of a Spray Deflector Part No C...

Страница 43: ...re met Xgard Type 5 requires a dc supply of 10 30 V at up to 100 mA Ensure there is a minimum of 10 V at the detector taking into account the voltage drop due to cable resistance For example a nominal...

Страница 44: ...on as shown in Diagram 12 Note The internal grounding terminal see diagram 12 shall be used as the grounding means of the Xgard gas detector The external grounding terminal see diagram 12 is only a su...

Страница 45: ...dc mV range and the potentiometer marked VR3 should be adjusted until the DVM reads 0 00 mV The PCB cover can now be replaced 6 To zero the detector reconnect the DVM to the test points marked TP1 an...

Страница 46: ...checking the zero setting 12 Close the junction box of the detector ensuring that the lid is securely tightened and the grub screw is secured 13 The detector is now operational Note ATEX certified Xga...

Страница 47: ...stor has been exposed Under normal conditions 6 monthly calibration with periodic exposure to CAL gas the life expectancy is 3 5 years Site practices will dictate the frequency with which detectors ar...

Страница 48: ...to align the locating pins correctly with the slots in the junction box 5 Re fit the sensor retainer having first inspected the sinter to make sure that it has not become contaminated Contaminated it...

Страница 49: ...sig terminal Relative to ve terminal common Operating temperature 40 C to 55 C 40 F to 131 F Humidity 0 99 RH non condensing Degree of protection IP65 IP66 when fitted with a weatherproof cap Explosi...

Страница 50: ...temperature remains stable otherwise the sensor readings may be affected For a list of gas mixtures that can be detected using Xgard Type 6 please contact Crowcon Xgard Type 6 is powered by 24 V dc no...

Страница 51: ...4 o d pipe Part No C01339 Crowcon recommend a flow rate of 0 5 1 litre minute and the sample gas must be suitably filtered to remove dust and moisture When locating detectors consider the possible da...

Страница 52: ...et Xgard Type 6 requires a dc supply of 10 30 V at up to 100 mA Ensure there is a minimum of 10 V at the detector taking into account the voltage drop due to cable resistance For example a nominal dc...

Страница 53: ...on as shown in Diagram 14 Note The internal grounding terminal see diagram 14 shall be used as the grounding means of the Xgard gas detector The external grounding terminal see diagram 14 is only a su...

Страница 54: ...etails of the background gas This is normally air carbon dioxide nitrogen or argon Apply a sample of the background gas 100 volume concentration to the sensor at a flow rate of 0 5 1 litre minute via...

Страница 55: ...setting Where the Range is the maximum value of the target gas and Gas is the concentration of the target gas in the calibration mixture Example calibrating a detector to measure 0 100 volume methane...

Страница 56: ...detectors are tested Crowcon would recommend that detectors be gas tested at least every 6 months and re calibrated as necessary To re calibrate a detector follow the steps given in 3 1 The sinter sh...

Страница 57: ...ction box of the detector by unscrewing the lid in an anti clockwise direction having loosened the retaining grub screw first 3 Unscrew the sensor retainer and remove the sensor and sensor PCB 4 Fit t...

Страница 58: ...sig terminal Relative to ve terminal common Operating temperature 10 C to 55 C 50 F to 131 F Humidity 0 90 RH non condensing Degree of protection IP65 IP66 when fitted with a weatherproof cap Explosi...

Страница 59: ...ring M04829 All Types Amplifier PCB for the following gas types S011238 2 Types 1 2 Carbon Monoxide Chlorine Chlorine Dioxide Hydrogen Hydrogen Sulphide Nitrogen Dioxide Sulphur Dioxide City Technolo...

Страница 60: ...adaptor C011061 Spray deflector C01052 Spare parts and accessories Weatherproof cap C01442 Flow adaptor C01339 Collector cone C01051 Sun Shade C011063 Note these accassories are not compatible with X...

Страница 61: ...igh levels of toxic or flammable gas will shorten the life of the sensor If the high level gas is corrosive e g hydrogen sulphide damage may occur over time to metal components Sensors may be cross se...

Страница 62: ...ies may be rendered invalid if the use of an unauthorized charger is proven Non rechargeable batteries are excluded from this warranty Warranties on sensors assume normal usage and will be rendered in...

Страница 63: ...l not affect a customer s statutory rights Crowcon reserves the right to apply a handling and carriage charge whereby units returned as faulty are found to require only normal calibration or servicing...

Страница 64: ...10 421 0542 email eu crowcon com internet http www crowcon com USA Office Crowcon Detection Instruments Ltd 21 Kenton Lands Road Erlanger Kentucky 41018 1845 USA Tel 1 859 957 1039 or 1 800 527 6926 F...

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