Crowcon Xgard Bright Handbuch

Installation, Operation and Maintenance Instructions

M070068

Issue 1

January 2019

Xgard Bright

Gas Detectors with Display and Relays

Contents

1. Introduction.............................................................................. 1

1.1 Product overview.............................................................. 1

1.2 Safety information............................................................ 1

1.3 Storage instructions.......................................................... 2

1.4 Certification labels........................................................... 3

1.5 Product dimensions .......................................................... 4

1.6 Exploded view .................................................................. 5

2. Installation................................................................................ 6

2.1 Location ........................................................................... 6

2.2 Mounting......................................................................... 7

2.3 Cabling requirement......................................................... 7

2.4 Electrical connections ....................................................... 8

2.5 Earthing requirements ...................................................... 9

2.6 Cable glands .................................................................. 10

2.7 Fitting accessories........................................................... 13

3. Operation ............................................................................... 14

3.1 Operation panel ............................................................. 14

3.2 Key Operation ................................................................ 14

3.3 Start up.......................................................................... 15

3.4 Menu functions.............................................................. 16

3.5 Zero ............................................................................... 17

3.6 Calibrate ....................................................................... 17

3.7 Routine maintenance ..................................................... 18

3.8 Sensor replacement........................................................ 18

4. Specifications.......................................................................... 20

5. Warranty ................................................................................ 21

English

1. Introduction

1.1 Product overview

XGard Bright is a versatile gas detector for monitoring a wide range of

ﬂammable and toxic gases and oxygen levels. XGard Bright incorporates a

bright OLED (organic light emitting diode) display and a magnetic wand for

easy menu operation.

XGard Bright provides analogue 4-20mA and RS-485 Modbus signals as

standard, with optional HART interface. Relays are also ﬁtted for activating local

alarms or sending digital signals to control systems.

XGard Bright may be ﬁtted with electrochemical type toxic or oxygen sensors,

pellistor-type ﬂammable gas sensors or infrared (IR) hydrocarbon or carbon

dioxide gas sensors. Please refer to the product identiﬁcation label to determine

the type of sensor ﬁtted.

Pellistor sensors are designed to detect ﬂammable gases and vapours in

concentrations not exceeding the Lower Explosive Limit (LEL) of the target gas

for which the detector is calibrated.

XGard Bright is ATEX and IECEx Ex db IIC T6 Gb ﬂameproof certiﬁed for use in

Zone 1 or 2 hazardous areas

1.2 Safety information

Safety information relevant to Ex requirements:

• WARNING – POTENTIAL ELECTROSTATIC CHARGING HAZARD. The painted

aluminium enclosure constitutes a potential electrostatic hazard and the

equipment must only be cleaned using a damp cloth.

• The cable gland must be installed before use and must comply with the

requirements of standards EN60019-0 and EN60079-1 with minimum IP66

ingress protection.

• Unused cable entries must be sealed using an ATEX/IECEx Exd certiﬁed

stopping plug with minimum IP66 ingress protection.

• Only cables of types speciﬁc in these instructions can be used.

• External earthing should be considered and installed according to these

instructions before use.

• WARNING – DO NOT OPEN WHEN AN EXPLOSIVE ATMOSPHERE IS

PRESENT.

• The lid on XGard Bright must be kept tightly closed until power to the

Introduction

English

detector is isolated otherwise ignition of a ﬂammable atmosphere can

occur. Before removing the cover for maintenance, ensure the surrounding

atmosphere is free of ﬂammable gases or vapours.

General safety information

• XGard Bright gas detectors must be installed, operated and maintained in

strict accordance with these instructions, warnings, label information, and

within the limitations stated.

• XGard Bright detectors are designed to detect gases or vapours in air, and

not inert or oxygen deﬁcient atmospheres. XGard Bright oxygen detectors

can measure in oxygen deﬁcient atmospheres.

• Electrochemical cells used in toxic and oxygen versions of XGard Bright

contain small volumes of corrosive electrolyte. Care should be observed

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 genuine Crowcon replacement parts must be used, substitute

components may invalidate the certiﬁcation and warranty of the detector.

• XGard Bright detectors must be protected from extreme vibration, and

direct sunlight in hot environments as this may cause the temperature of

the detector to rise above its speciﬁed limits and cause premature failure. A

sunshade is available for XGard Bright.

• This equipment must not be used in a Carbon Disulphide atmosphere.

1.3 Storage instructions

Some types of sensor available with XGard Bright have limited life when left

un-powered and/or may be adversely affected by temperature extremes or

environmental contamination. Ideal storage conditions are 20˚C and 60%RH.

Do not expose sensors to contaminants such as silicones, lead compounds and

strong solvents such as isopropanol. It is strongly recommended detectors are

installed and powered within 3 months of purchase.

Introduction

English

1.4 Certiﬁcation labels

Diagram 1: Xgard Bright Certiﬁcation Labels

ATEX and IECEx certiﬁcation label

Gas name and range label

Warning label

Introduction

English

1.5 Product dimensions

All dimensions in millimetres

Diagram 2: Xgard Bright dimension view

Introduction

English

1.6 Exploded view

Diagram 3: Xgard Bright exploded view

English

2. Installation

WARNING

This detector is designed for use in Zone 1 and Zone 2 hazardous

areas, and is certiﬁed Ex db IIC T6 Gb for operation up to 70°C

(158°F). Installation must be in accordance with the recognized

standards of the appropriate authority in the country concerned.

For further information please contact Crowcon. Prior to carrying

out any installation work ensure local regulations and site

procedures are followed.

2.1 Location

The detector should be mounted where the gas to be detected is most likely to

be present. The following points should be noted when locating gas detectors:

• To detect gases which are lighter than air, detectors should be mounted at

high level and Crowcon recommend the use of a collector cone (Part No.

C01051).

• To detect heavier than 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 the use of a Spray Deﬂector (Part No. C01052).

• Consider ease of access for functional testing and servicing.

• Consider how the escaping gas may behave due to natural or forced air

currents. Mount detectors in ventilation ducts if appropriate.

• Consider the process conditions. For example, butane is normally heavier

than air, but if released from a process which is at an elevated temperature

and/or pressure, the gas may rise rather than fall.

• Location of oxygen sensors requires knowledge of the gas that may

displace the oxygen. For example, carbon dioxide is denser than air and

therefore is likely to displace oxygen from low levels upwards.

• Sensors should be mounted at head height (1.5m nominally) to detect

gases of a similar density to air, assuming that ambient conditions and the

temperature of the target gas are nominally 20˚C.

The placement of sensors should be determined following advice of experts

having specialist knowledge of gas dispersion, the plant processing equipment

as well as safety and engineering issues. The agreement reached on the

locations of sensors should be recorded.

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