GAS Gasmaster Manuale utente

1 to 4 channel gas detection control panel

Gasmaster

Installation, Operation and

Maintenance Manual

The equipment described in this manual may have mains voltages applied to it. Ensure correct safety procedures are adopted

before working on the equipment. The equipment described in this manual is designed for the detection of ammable and/

or toxic gases. Detectors may be sited in hazardous areas. Ensure local safety procedures are adopted before carrying out any

maintenance or calibration work. The equipment described in this manual may be connected to remote alarms and/ or shutdown

systems. Ensure that local operating procedures are adopted before carrying out any maintenance or calibration work.

This product has been tested and found to comply with the European Directive 2004/108/EC and the EMC requirements of

EN50270. It also complies with the Council Directive 2006/95/EC relating to electrical safety and the Low Voltage Directive. It

conforms to the CE Marking Directive 93/68/EEC.

Contents

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

1.1 About Gasmaster ....................................................................................................................1

1.2 About this manual ..................................................................................................................1

1.3 Instructions for use as part of an ATEX approved system.........................................2

2. Installation .................................................................................................................................3

Please read this rst................................................................................................................3

2.1 Before installation ...................................................................................................................4

2.1 General........................................................................................................................................4

2.3 Mounting....................................................................................................................................5

2.4 Cabling requirements............................................................................................................5

2.5 Installing gas and re detectors.........................................................................................6

2.6 Installing output devices......................................................................................................6

2.7 Connecting mains power..................................................................................................... 6

2.8 Connecting input devices....................................................................................................7

2.9 Connecting output devices.................................................................................................11

2.10 Applying power .......................................................................................................................13

2.11 Battery back-up times............................................................................................................13

2.12 Commissioning........................................................................................................................14

3. Operation...................................................................................................................................17

3.1 Gasmaster Operator Panel...................................................................................................17

3.2 Gasmaster start up sequence .............................................................................................19

3.3 How to adjust display contrast...........................................................................................19

3.4 How to display Instrument serial number and system identity .............................19

3.5 Using the menu system ........................................................................................................20

3.6 Inhibiting channels.................................................................................................................20

3.7 Using the Control Panel in Supervisor Mode................................................................21

3.8 In the event of an alarm........................................................................................................22

3.9 mV channels: Pellistor saver mode ...................................................................................22

3.10 In the event of a fault.............................................................................................................23

3.11 System Conguration ............................................................................................................23

4. Maintenance .............................................................................................................................35

4.1 Functional Testing...................................................................................................................35

4.2 System Inhibi ............................................................................................................................35

4.3 Detector Calibration...............................................................................................................36

4.4 Changing Batteries .................................................................................................................36

4.5 Module Replacement ............................................................................................................36

4.6 Event logging............................................................................................................................36

4.7 Service card ..............................................................................................................................36

4.8 Cleaning......................................................................................................................................36

5. Adding an input module......................................................................................................37

Appendix A: Specications..................................................................................................38

Appendix B: Spare Parts and Accessories.......................................................................39

Appendix C: Display characters..........................................................................................40

Warranty Statement ...............................................................................................................41

1.1 About Gasmaster

Gasmaster is a gas and re control panel, designed

to monitor remote gas and re detectors.

Gasmaster can also monitor ame detectors as

well as GAS’s ESU product. The status of each input

is displayed on a large, clear LCD display, and

alarms or faults are indicated by clear LEDs and an

integral sounder.

Relay outputs are provided for alarms and faults, as

well as dedicated outputs for audible visual alarms.

An RS-485 Modbus output is provided for two-wire

transfer of all data to industry-standard control

systems.

Gasmaster logs all alarm and fault events so that

they can be investigated at a later stage using

Gasmaster PC software.

There are two versions of Gasmaster:

• Gasmaster 1 - single channel unit for one gas

detector, re zone or ESU sampling device.

• Gasmaster 4 - four channel unit for one to

four gas detectors, re zones or ESU sampling

devices.

Gasmaster 1 is identiable from Gasmaster 4 by

having only a single channel display (see gure

3.2, page 18) and a de-populated terminal PCB. All

operating functions are identical to Gasmater 4.

Gasmaster is designed for simple operation, and all

day-to-day functions can be performed from the

front panel. Please refer to section 3 for details on

display operation.

1.2 About this manual

The manual is divided into sections which

detail procedures for installing, operating and

maintaining Gasmaster. Gasmaster is a safety

system and it is essential that all instructions are

correctly followed.

Details of the types of device that can be

connected to Gasmaster are shown in section 2,

along with typical connection diagrams. Section

3 provides instructions for day-to-day operation

of Gasmaster as well as detailed information on

system conguration.

Warning

Regular maintenance of any safety system is essential,

and failure to maintain the system according to these

instructions could result in failures which could lead to

harm to plant and/or personnel or even death. Details of

the requirements for Gasmaster systems are provided in

section 4.

There are separate appendices for systems

specication and spare parts identication.

1. Introduction

1.3 Instructions for use as part of

an ATEX approved system

Gasmaster is approved according to the 94/9/EC

ATEX Directive when used as part of a system with

intrinsically safe gas detectors and I.S. barriers.

Gasmaster has been certied according to

EN60079- 25:2010 Explosive atmospheres -

Intrinsically safe electrical systems. Certicate

reference: Baseefa05Y0090/1 Gasmaster must

be installed in the safe area only, but is certied

for connection to Intrinsically Safe gas detectors

installed in Zone 0, 1 or 2 hazardous areas when

connected by a safety barrier. Installation must be

in accordance with the instructions shown below.

Please read this rst

Before commencing the installation and commisioning

of your Gasmaster system, please read through the

following information which will guide you through

the whole process.

The installation instructions contained in this section

are for a pre-congured Gasmaster. For instructions on

installing and commissioning gas and re detectors,

please follow the user manual instructions supplied

with the detectors. Alternatively contact Gas Alarm

Systems for advice.

To complete the installation of your Gasmaster system

you will need to use the Operator panel and Menu. Full

instructions can be found in section III. Operation, you

are advised to familiarise yourself with the operator

buttons on the front panel and the menu structure, see

page 25. Some conguration steps may require you to

enter Supervisor mode. Gas Alarm Systems advises that

personnel familiar with installing and commisioning

gas and re detection systems carry out this part.

If you have purchased a Gasmaster 1

Please follow the instructions in this section but ignore

the reference to additional channels.

If you have purchased a non-congured

Gasmaster 4

Please follow the installation instructions for a pre-

congured Gasmaster 4. Additional information

on setting-up your Gasmaster system can be found in

section III. Operation.

Step-by-step instructions

The installation and commissioning of your Gasmaster

system is presented in easy to follow instructions. A

summary table of contents detailing a typical sequence

of installation steps is shown below. Depending on

your conguration some or part of each step may be

omitted.

Warning:

Gasmaster is not certied for use in hazardous

areas, but may be connected to detectors

and/or alarm devices which are installed in a

hazardous area. Instructions for eld devices

must be closely observed when installing a

Gasmaster system.

2.1 Before installation

2.2 General

2.3 Mounting

2.4 Cabling requirements

2.5 Installing gas and re detectors

2.6 Installing output devices

2.7 Connecting mains power

2.8 Connecting input devices

2.8.1 Two wire 4-20mA devices

2.8.2 Three wire 4-20mA devices

2.8.3 mV bridge pellistor detectors.

2.8.4 Heat/smoke detectors

2.8.5 Environmental Sampling Unit

(ESU)

2.8.6 Flame detectors

2.8.7 Remote inhibit and accept/

reset inputs

2.9 Connecting output devices

2.9.1 Audible visual alarms

2.9.2 Common relay connections

2.9.3 Channel relay connections

2.9.4 Analogue outputs

2.9.5 RS485 communications

2.10 Applying power

2.11 Battery back-up time/power calculations

2.12 Commissioning

2.12.1 Commissioning mV pellistor

detectors

2.12.2 Zero adjustment and calibration

2.12.3 Testing re channels

2.12.4 Testing ESU channels

2. Installation

2.1 Before installation

Before carrying out any installation work, ensure that

local regulations and site procedures are followed.

Further advice is available from Gas Alarm Systems if

required.

Gasmaster is intended for use in non hazardous areas.

Gas and re detectors may be mounted in potentially

ammable atmospheres using appropriate barrier

devices where necessary. Check the equipment to be

installed is suitable for the area classication. Please

refer to instrument installation manuals for information

on location.

Gas Alarm Systems recommends the installation of

Gasmaster be carried out by people with experience of

installing electrical equipment in potentially hazardous

areas.

2.2 General

This section describes how to get started with a

Gasmaster 4 or Gasmaster 1 system that has been pre-

congured for the detectors supplied. Figures 2.1, 2.2

and 2.5 show the internal structure of Gasmaster.

See the Specication and Inspection Certicate

provided with your system for full details of its

conguration.

Figure 2.1 shows the internal arrangement of a

Gasmaster system. The front cover ➀is removed

by unscrewing the four screws ➁and carefully

disconnecting the two-pole sounder connector

from the display PCB ➂. The front cover can either

be supported by the case using one of the retaining

screws, or removed completely and placed in a safe

location. Two separate chassis support the display PCB

and batteries which supports the display PCB ➂and

batteries ➃. The terminal PCB ➆contains the input

modules, and all of the input and output terminals. The

display PCB ➂is connected to the terminal PCB ➆via

a 50-way ribbon connector, and is hinged on the left

side so that it can be moved to provide access to the

detector input terminals. Most terminals are accessible

once the display PCB is moved and the batteries are

removed. If necessary the two chassis can be removed

for easier terminal access.

In order to remove the display chassis, the display PCB

ribbon connector must rst be carefully unplugged.

Care should be taken when re-tting the display PCB so

as not to damage the connector or ribbon cable.

Six punched cable gland knock-outs are provided

on the top and bottom of the enclosure. The knock-

outs are suitable for M20, 1/2”NPT or PG13.5 cable

glands. To remove Knock-outs,tap around the edge

of the recessed ange using a small hammer and a

screwdriver. The knocks outs should then come away

from the enclosure

Knock-outs should be removed prior to mounting

Gasmaster and great care must be taken to avoid

damaging internal components.

Power supply

Gasmaster comes tted with an auto-ranging power

supply suitable for 100-240 V ac 50-60 Hz operation.

This provides a nominal 24 V dc supply with a

maximum power of 60 W. Alternatively Gasmaster

can be powered from an external 24 V dc supply, a

maximum 60 W supply is required. Gasmaster must

never be connected to ac and dc supplies at the same

time.

2. Installation

The Gasmaster power supply contains no user

replaceable fuses.

Short circuit protection

Each detector input is short-circuit protected. Self-

resetting‘polyfuses’ are tted to the 24 V power supply

which will cut power in the event of a cabling fault,

and automatically reset when the fault is corrected.

Detectors with a maximum consumption of 500 mA

may be connected.

Circuit breaker

If the equipment is permanently connected to a

mains supply then a dedicated circuit breaker must be

included in the installation, to comply with EN 61010-

1. The circuit breaker must be close to Gasmaster, in

easy reach of the operator. It must be marked as the

disconnecting device for the Gasmaster system, and

the ON and OFF positions must be clearly marked.

The circuit breaker must comply with the relevant

requirements of IEC60947-1 and IEC60947-3. The

protective earth must not be disconnected even when

the breaker is activated.

Figure 2.2 Gasmaster chassis plate with display PCB

board and batteries.

2.3 Mounting

All Gasmaster systems should be installed in a safe area.

Consider location, cabling and earthing requirements.

Figure 2.3 provides a dimensional view of Gasmaster.

To access the mounting points, rst remove the front

cover by unscrewing the xings labelled ➁in gure

2.1. Carefully remove the sounder connector from

the display PCB. The cover should be placed in a

secure location. It is recommended that Gasmaster is

positioned by hand in the desired location, and a pencil

used to mark the mounting hole positions. Gasmaster

should be removed before drilling the mounting

holes. Nylon bushes suitable for up to 5mm screws are

tted within the Gasmaster mounting points. Ensure

these bushes are present when mounting as they are

essential to maintain the ingress protection of the

enclosure.

Figure 2.3 Dimensional view of Gasmaster with

mounting holes shown

2.4 Cabling requirements

Cabling to Gasmaster and detectors must be in

accordance with the recognised standards of the

appropriate authority in the country concerned, and

must meet the electrical requirements of the detector.

• Explosion-proof (Exd) devices

Gas Alarm Systems recommends the use of steel wire

armoured (SWA) cable. Suitable explosionproof glands

must be used.

• Intrinsically Safe (I.S.) devices

Gas Alarm Systems recommends the use of twisted

pair cable with overall screen and sheath. Suitable

weatherproof glands must be used. I.S. devices must be

used with a suitable Zener Barrier or Galvanic Isolator

when used in a hazardous area.

2. Installation

• Fire detectors

Gas Alarm Systems recommends the use of twisted-pair

cable, screened with an overall protective sheath that

is reproof, for example, Pirelli FP200 or similar. A 1K8

end-of-line resistor must be tted to the last detector

on each conventional smoke or heat detector loop.

Alternative cabling techniques, such as steel conduit,

may be acceptable provided that appropriate

standards are met. The minimum acceptable supply

voltage measured at the detector and the maximum

current drawn by that detector is dierent for each

device. Please refer to the relevant Installation,

Operating and Maintenance Instructions provided

with each detector to calculate the maximum cable

distances allowed for dierent cable types.

The maximum cable distance allowed is dependent

upon the installation, for example, whether Zener

Barriers or Galvanic Isolators are required (for I.S.

devices) or not.

When calculating maximum cable distances for

detectors, assume a minimum supply of 19 V and

a sense resistance of 98 Ω (39 Ω for convential re

channels).

Table 1: Typical cable characteristics

c.s.a (mm2)* Resistance (Ω per km)

Cable Loop

0.5 (20) 39.0 78.0

1.0 (17) 18.1 36.2

1.5 (15) 12.1 24.2

2.5 (13) 8.0 16.0

*Approximate c.s.a. in awg given in brackets.

Cable lengths should be calculated according to the

equations dened in the detector instructions sheet

and the cable and Gasmaster characteristics specied

above.

There are a number of suitable ways of terminating

cables and glands to Gasmaster dependant on the

cable and gland type:

– Steel wire-armoured (SWA) cable and glands with

electrical termination of the armour to the enclosure

via the gland.

– Screened cable with the screen terminated inside the

enclosure via a metal tag attached to the gland.

– Screened cable using an EMC gland where the screen

is terminated to the enclosure via the gland.

– For detectors, 4-20 mA outputs and RS- 485

terminations: screened cable where the screen is

connected to the SCR terminal on the appropriate

terminal strip.

2.5 Installing gas and re detectors

Install gas and re detectors as per instrument

installation manuals, paying attention to location and

cabling requirements. For ESU devices please refer to

installation manual provided.

2.6 Installing output devices

Gasmaster can drive 12 V dc or 24 V dc audible visual

alarms directly via the Audible Visual drive terminals

on the terminal PCB. Relays are provided for switching

additional outputs, and 12 V dc or 24 V dc 200 mA

auxiliary supplies are available adjacent to each

block of relay terminals for switching low power

devices. Section 2.9 provides detailed information on

connections to output devices.

2.7 Connecting mains power

Connect the external power supply using the two part

screw terminals, refer to Figures 2.4 and 2.5.

Gasmaster must be earthed either at the power

connector earth terminal (see Figure 2.4) or using the

stud on top of the enclosure.

Figure 2.4 Mains connection terminals on terminal PCB

2. Installation

2.8 Connecting input devices

Gasmaster may be tted with between one and four

input modules (one only for Gasmaster 1) of the

following types:

• 4-20mA/Fire module for 4-20mA type detectors,

conventional smoke/heat detectors or ESU.

• mV Pellistor module for mV bridge type ammable

gas detectors.

Details of hardware congurations and link settings can

be found in section 2.8.1 to 2.8.6.

4-20 mA Inputs

Gasmaster provides analogue 4-20 mA inputs with a

sensor supply voltage of 19 to 28 V dc and measures the

signal across a 98 Ω sense resistor.

Inputs can be gas detectors or ame detectors in 4-20

mA 2-wire sink, or 3-wire sink or source congurations.

Gasmaster will track inputs from 3 to 21.5 mA at which

point an ‘over-range’ fault will be indicated. Connection

details are shown in section 2.8.1 and 2.8.2.

2. Installation

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