User Manual

Gasmaster

M07624

Issue 6

July 2008

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 flammable 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 89/336/EEC and the EMC requirements of EN50270. It also complies with the

Council Directive 73/23/EEC relating to electrical safety and the Low Voltage Directive. It conforms to the CE

Marking Directive 93/68/EEC.

MODEL

GASMASTER

Passed inspection by

Date

Tested for electrical safety by

Date

R

C22.2 No.152

Caution : Read & understand manual before operating. Mount outside hazardous area.

See manual for relay contact ratings.

2 Blacklands Way, Abingdon Business Park,

Abingdon, Oxon, OX14 1DY, England

Telephone: 01235 557700 Fax 01235 557749 www.crowcon.com

The Canadian Standards Authority (CSA) have only assessed the combustible gas portion of this instrument for performance.

Crowcon Detection Instruments Ltd

2 Blacklands Way, Abingdon

OX14 1DY UK

Tel. +44 (0)1235 557700

Fax. +44 (0)1235 557749 www.crowcon.com

Email: [email protected]

© Copyright Crowcon Detection Instruments Ltd 2008

All rights are reserved. No part of the document may be photocopied, reproduced, or translated to another language without the prior written consent of Crowcon

Detection Instruments Ltd.

Publication number: M07624

Sixth edition: July 2008

GasMaster Contents

Contents

I. Introduction . . . . . . . . . . . . . . . . . . . . . 1

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

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

1.3 Instructions for use in marine applications . . . . . . . . . . . . . . . . . . 2

II. Installation . . . . . . . . . . . . . . . . . . . . . . 3

Please read this first. . . . . . . . . . . . . . . . 3

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

2.2 General . . . . . . . . . . . . . . . . . . . . . 4

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

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

2.5 Installing gas and fire 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

III. Operation . . . . . . . . . . . . . . . . . . . . . . 16

3.1 Gasmaster Operator Panel. . . . . . 16

3.2 Gasmaster start up sequence . . . 18

3.3 How to adjust display contrast . . 18

3.4 How to display Instrument serial number and system identity . . . . 18

3.5 Using the menu system . . . . . . . . 19

3.6 Inhibiting channels . . . . . . . . . . . 19

3.7 Using the Control Panel in

Supervisor Mode . . . . . . . . . . . . . 20

3.8 In the event of an alarm . . . . . . . 21

3.9 In the event of a fault . . . . . . . . . 21

3.10 System Configuration . . . . . . . . . 21

Menu system overview . . . . . . . . . . . . . . . 23

Faults menu

. . . . . . . . . . . . . . . . . . . . . . . . 23

Warnings menu

. . . . . . . . . . . . . . . . . . . . . 25

View menu

. . . . . . . . . . . . . . . . . . . . . . . . . . 26

Actions menu

. . . . . . . . . . . . . . . . . . . . . .27

Supervisor menu . . . . . . . . . . . . . . . . .

28

IV. Maintenance . . . . . . . . . . . . . . . . . . . . 34

4.1 Functional Testing . . . . . . . . . . . . 34

4.2 System Inhibit . . . . . . . . . . . . . . . 34

4.3 Detector Calibration . . . . . . . . . . 35

4.4 Changing Batteries . . . . . . . . . . . 35

4.5 Module Replacement . . . . . . . . . 35

4.6 Event logging . . . . . . . . . . . . . . . 35

4.7 Service card. . . . . . . . . . . . . . . . . 35

4.8 Cleaning . . . . . . . . . . . . . . . . . . . 35

Appendix A: Specifications . . . . . . . . . . . . 36

Appendix B: Spare Parts and Accessories . 37

Appendix C: Display characters . . . . . . . . . 38

Warranty Statement . . . . . . . . . . . . . . . . . 39

Regional addresses . . . . . . . . . . . . . . . . . . 40

GasMaster Introducton

I. Introduction

1.1 About Gasmaster

Gasmaster is a gas and fire control panel, designed to monitor remote gas and fire detectors. Gasmaster can also monitor flame detectors as well as Crowcon'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, fire zone or ESU sampling device.



.

Gasmaster 4 - four channel unit for one to four gas detectors, fire zones or ESU sampling devices.

Gasmaster 1 is identifiable from Gasmaster 4 by having only a single channel display (see figure

3.2, page 16) 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 configuration.

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 specification and spare parts identification.

Introducton GasMaster

1.3 Instructions for use in marine applications

This section applies only to the following products:

C011058 Gasmaster 1 single channel unit.

Marine approved.

C011060 Gasmaster 1 with Communications

Port. Marine approved.

C011057 Gasmaster 4 one to four channel unit. Marine approved.

C011059 Gasmaster 4 with Communications

Port. Marine approved

Additional Cabling Requirement for Marine

Applications

In order to meet Marine EMC requirements the following installation instructions should be followed for all cables entering/leaving the enclosure. After installing the gland and cable into the enclosure each core of the cable should loop round a ferrite ring as shown in the diagram below.

3 ferrite beads will be initially supplied for single channel units.

6 ferrite beads will be initially supplied for

4-channel units.

If additional cables require installation, please contact Crowcon sales in order to purchase more ferrite beads, quoting E01773 as the part number reference.

Usage of these ferrites is a requirement for Marine certification.

&ERRITE

#ROWCON0ART.UMBER

%

SUPPLIED

7IRES

#ABLE'LAND

FERRITEBEADSWILLBEINITIALLYSUPPLIEDFORSINGLECHANNELUNITS

FERRITEBEADSWILLBEINITIALLYSUPPLIEDFOR CHANNELUNITS

!TMINIMUMTHEFOLLOWINGCABLESREQUIRET HISAPPLICATION-AINS0OWER

#HANNEL)NPUTAND!UDIBLE6ISUAL!LARM

GasMaster Installaton

II. Installation

Please read this first

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-configured

Gasmaster

.

For instructions on installing and commissioning gas and fire detectors, please follow the user manual instructions supplied with the detectors.

Alternatively contact Crowcon 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 21. Some configuration steps may require you to enter

Supervisor mode. Crowcon advises that personnel familiar with installing and commisioning gas and fire 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-configured

Gasmaster 4

Please follow the installation instructions for a pre-configured 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 configuration some or part of each step may be omitted.

Warning:

Gasmaster is not certified for use in hazardous areas, but may be connected to detectors and/or alarm devices which are installed in a hazardous area. Instructions for field 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 fire detectors

2.6 Installing output devices

2.7 Connecting mains power

2.8 Connecting input devices

2.8.1 Two wire devices

2.8.2 Three wire devices

2.8.3 Heat/smoke detectors

2.8.4 Environmental Sampling Unit

(ESU)

2.8.5 Flame detectors

2.8.6 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 Zero adjustment and calibration

2.12.2 Testing fire channels

2.12.3 Testing ESU channels

Installaton GasMaster

2.1 Before installation

Before carrying out any installation work, ensure that local regulations and site procedures are followed. Further advice is available from Crowcon if required.

Gasmaster is intended for use in non hazardous areas. Gas and fire detectors may be mounted in potentially flammable atmospheres using appropriate barrier devices where necessary. Check the equipment to be installed is suitable for the area classification. Please refer to instrument installation manuals for information on location.

Crowcon 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

or

Gasmaster

system that has been pre-configured for the detectors supplied. Figures

2.1, 2.2 and 2.5 show the internal structure of

Gasmaster.

See the

Specfcaton and Inspecton Certfcate

provided with your system for full details of its configuration.

Figure 2.1 shows the internal arrangement of a

Gasmaster system. The front cover



is removed by unscrewing the four screws



and carefully disconnecting the two-pole sounder connector from the display PCB



. The front cover should then be placed in a safe location. With the front cover removed the chassis plate



is accessible which supports the display PCB



and batteries



. Below the chassis plate is the terminal PCB

 which contains all the input and output terminals and power terminals. The display PCB



is connected to the terminal PCB



via 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, however if necessary the chassis plate can be removed for easier terminal access by carefully disconnecting the display PCB ribbon connector from the terminal PCB and unscrewing the four fixings



. Care should be taken when





Display

PCB



Display



PCB ribbon



Front cover



Batteries



Chassis plate



Gland knock outs



Optional comms port



Terminal PCB

Figure 2.1 Exploded view of Gasmaster re-fitting 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, ﬁ"NPT or PG13.5 cable glands. To remove Knock-outs, tap around the edge of the recessed flange 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 fitted 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.


The Gasmaster power supply contains no user replaceable fuses.

Short crcut protecton

Each detector input is short-circuit protected.

Self-resetting ‘polyfuses’ are fitted 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.

Crcut 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.

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.

278

120

110

77

5

Batteries

Battery connection diagram

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, first remove the front cover by unscrewing the fixings labelled



in figure 2.1. Carefully remove the

Mounting holes

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

Crowcon recommends the use of steel wire armoured (SWA) cable. Suitable explosionproof glands must be used.



Intrinsically Safe (I.S.) devices

Crowcon 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.



Fire detectors,

Crowcon recommends the use of twisted-pair cable, screened with an overall protective sheath that is fireproof, for example, Pirelli

FP200 or similar. A 1K8 end-of-line resistor must be fitted 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 different 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 different 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 fire channels).

Table 1: Typical cable characteristics c.s.a

(mm2)*

Resistance (

Ω

per km)

Cable Loop

0.5 (20)

1.0 (17)

39.0

18.1

78.0

36.2

1.5 (15)

2.5 (13)

12.1

8.0

24.2

16.0

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

Cable lengths should be calculated according to the equations defined in the detector instructions sheet and the cable and Gasmaster characteristics specified 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 fire detectors

Install gas and fire 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 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 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.

Live Neutral Earth

E N L

L N E

FIRE

SINK

SRCE

CH1

CH2

FIRE

SINK

SRCE

Figure 2.4 Mains connection terminals on terminal PCB

GasMaster

MAINS

INPUT

CHANNEL

INPUT

TERMINALS

COMMON

RELAY TERMINALS

Installaton

DISPLAY

PCB

CONNECTOR

CHANNEL

RELAY

TERMINALS

LINK TO

CHASSIS

ON NON

I.S.SYSTEM

ONLY

LINK TO

CHASSIS

ON I.S.

SYSTEM

ONLY

EXTERNAL

24 V DC

INPUT

ANALOGUE

OUTPUT

TERMINALS

Figure 2.5 Terminal PCB layout

RS-485 MODBUS

COMMUNICATIONS

TERMINALS

AUDIBLE VISUAL

ALARM TERMINALS

REMOTE INHIBIT AND

ACCEPT/RESET INPUTS

2.8 Connecting input devices

Gasmaster provides connectivity to a range of gas and fire detectors using two part connectors with screw terminals. Each channel input can accept 4-

20 mA or conventional fire loop.

Note: Gasmaster

has one channel only. Ths channel can be used to detect one gas detector, fre zone or ESU.

Details of hardware configurations 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 flame detectors in 4-20 mA 2-wire sink, or 3-wire sink or source configurations. 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.

Conventonal fre detectors

A loop of up to 20 conventional smoke/heat detectors (for example Apollo series 60 devices) can be connected to each Gasmaster input channel. A fire loop can also comprise switched devices such as manual alarm call points or flame detectors, and devices can be mixed on the


same loop provided electrical characteristics are compatible and fire regulations allow. Switched devices require a 470

Ω

series resistor. Each fire loop must be terminated with a 1K8 end-of-line resistor, which is monitored to provide indication of open circuit or short circuit faults. Connection details are shown in section 2.8.3.

Environmental Sampling Unit (ESU)

Each Gasmaster input can monitor a Crowcon

Environmental Sampling Unit (ESU), which enables detection of flammable or toxic gases over a wide area using a sample draw technique. It is essential that the sampling device on the ESU is operating correctly, and Gasmaster provides this monitoring function to ensure a sample is being drawn. Gasmaster provides a 2-wire 24

V dc supply to the sampling device. Separate

Gasmaster input channels are required to monitor the gas detector or detectors fitted to the ESU.

Connection details are shown in section 2.8.4.

mV bridge pellistor detectors

Some flammable gas detectors manufactured by Crowcon provide a mV bridge signal rather than a 4-20 mA signal. Typical examples are high operating temperature detectors and detectors which will be mounted in inaccessible areas.

An Accessory Box is available to enable these type of detectors to be connected to Gasmaster.

The Accessory Box contains 1 to 4 PCB's which convert the mV bridge signal from each detector to a 4-20 mA signal that can be monitored by Gasmaster. mV bridge detector cables will be terminated at the Accessory Box, which has a connector that simply plugs-in to Gasmaster.

Accessory Box details are shown in Appendix B.

Please contact Crowcon for specific wiring details for Crowcon detectors

2.8.1 Two wire devices

Figure 2.6 shows a typical wiring configuration for a 2 wire current sink detector. Set the detector type link for the appropriate channel to

SINK

and the protection link to short 1&2, refer to figure 2.5.

Detector Type Link

FIRE

SINK

SRCE

Protection Link

3 2 1

Detector

–

+

SCR

0V

SIG

PWR

Figure 2.6 Connections for 2 wire detector

Figures 2.7 and 2.8 show typical wiring configurations for a 2 wire sink I.S.detector with Zener barrier or Galvanic Isolator. Set the link for the appropriate channel as shown in each diagram.

2.8.2 Three wire devices

Figure 2.9 shows a typical wiring configuration for a 3 wire detector. Set the link for the appropriate channel to

SINK

for a current sink detector, or

SRCE

for a current source detector, the protection link should short 1&2, refer to figure 2.5.

–

SIG

+

FIRE

SINK

SRCE

Detector Type Link

OR

FIRE

SINK

SRCE

Protection Link

3 2 1

SCR

0V

SIG

PWR

Figure 2.9 Connections for 3 wire detector

2.8.3 Heat/smoke detectors

Conventional fire detectors for safe area use should be setup according to figure 2.10 and

2.11. Conventional fire detectors for hazardous area use should be setup according to figure

2.12.

Figure 2.11 shows connections for manual alarm call points.

GasMaster

HAZARDOUS AREA

Gas Detector

+

-

4-20mA Current Sink

Installaton

SAFE AREA

Z722

I.S. Earth

P&F Z722 Zener Barrier

Crowcon Part Number: C03335

Detector Type Link

FIRE

SINK

SRCE

Protection Link

3 2 1

SCR

0V

SIG

PWR

Figure 2.7 Typical connections for 2 wire I.S. detector with Zener barrier. Set channel link to SINK (see figure 2.5) and configuration to DET4-20 SINK (see Menu System Overview section, page 21 and 29.

HAZARDOUS AREA SAFE AREA

Detector Type Link

FIRE

SINK

SRCE

Protection Link

3 2 1

Detector

–

+

1

2

11

12

MTL

5041

13

14

–

+

20-35 V dc supply

SCR

0V

SIG

PWR

Detector

–

+

3

1

7

8

12

11

Pepperl & Fuchs

KFD2-CR-Ex1.30200

–

+

20-35 V dc supply

SCR

0V

SIG

PWR

Figure 2.8 Typical connections for 2 wire I.S. detector with Galvanic Isolator. Set channel link to SRCE (see figure 2.5) and configuration to DET4-20 SRCE (see Menu System Overview section, page 21 and 29.


L2

Fire detector

L2

Detector Type Link Protection Link

3 2 1

SCR

0V

SIG

PWR

2.8.5 Flame detectors

Figure 2.14 shows a typical wiring configuration for a 4-20 mA 3 wire Flame detector. Set the detector type link appropriate for the type of flame detector, refer to figure 2.5.

Do not set link to FIRE.

Figure 2.10 Connections for smoke/heat detector

1K8

Manual alarm call points

470R 470R


3 2 1

SCR

0V

SIG

PWR

4-20 mA

Flame detector

FIRE

SINK

SRCE

Detector Type Link

OR

FIRE

SINK

SRCE

Protection Link

3 2 1

–

SIG

+

SCR

0V

SIG

PWR

Figure 2.14 Connections for 4-20 mA 3 wire

Flame detector

Figure 2.11 Connections for manual alarm call points

2.8.4 Environmental Sampling Unit

(ESU)

Figure 2.13 shows the wiring configuration for monitoring the ESU sampling device. Gas detectors fitted to the ESU should be cabled separately to the appropriate input channels on the

Gasmaster or other control panel. For connections, details are shown on the instructions provided with the ESU.

2.8.6 Remote inhibit and accept/reset inputs

Gasmaster has inputs for the connection of remote switches to inhibit alarm outputs or accept and reset alarms. Inputs are activated when pulled down to 0 V, the open circuit voltage is 5 V dc.

Warning

Crowcon strongly recommends that remote inhibit switches be key operated only, and that access to the key should be restricted to authorised personnel. A Gasmaster system that has been inhibited without other safety precautions being in place may not provide the protection for which it was designed. Steps should be taken to ensure that all appropriate personnel are aware when a Gasmaster system is inhibited.

Detector Type Link

FIRE

SINK

SRCE

Protection Link

3 2 1

ESU sampling device terminal box

–

S

+

SCR

0V

SIG

PWR

Figure 2.13 Connections for ESU sampling device

HAZARDOUS AREA

1K8

L1

L2

L1

L2

Smoke or Heat Detectors

SAFE AREA


3 2 1

Figure 2.12 Connections for conventional fire detectors for hazardous area

Z722

SCR

0V

SIG

PWR

I.S. Earth

P&F Z722 Zener Barrier

Crowcon Part Number: C03335

0


Remote ACCEPT/RESET

Close the contact momentarily to accept alarms and cancel audible alarms. Close the contact again when the hazard is cleared to reset alarms.

Remote INHIBIT

Closing the contact will inhibit alarms on all input channels. Channels will remain inhibited until the contact is opened; the Gasmaster will then return to its original state (any channels that have been set to inhibit using the Supervisor menu will remain inhibited). Figure 2.15 shows wiring configurations for remote inputs.

Crowcon recommends screened cables for connecting remote switches. The screen should be terminated at the appropriate ‘SCR’ terminal.

Remote Accept/Reset Global Inhibit

0V

INH

A/R

0V

0V

INH

A/R

0V

Figure 2.15 Connections for remote inhibit/ accept/reset inputs

2.9 Connecting output devices

WARNING:

After accounting for internal power consumption, the maximum power available for input and output devices is 48 W

2.9.1 Audible visual alarms

Figure 2.16 shows a typical wiring configuration for 24 V dc audible visual alarms. The Audible

Visual drive output from Gasmaster is capable of providing up to 650 mA, which equates to two general purpose audible visual alarm devices.

Two separate sounder outputs are provided to activate on level 1 and level 2 alarms respectively

(terminal AV2 becomes active on alarm level 1,

AV3 becomes active on alarm level 2). Figure 2.16 shows connections to an audible visual alarm device that can produce different tones for level

1 and 2 alarms. If a single tone device is used, connections to the sounder should be made to terminals AV2 and 0 V only. Terminal AV1 is intended to drive a visual alarm and activates on a level 1 alarm.

2.9.2 Common relay connections

Double-Pole-Change-Over (DPCO) relays with contact rating of 250 V ac 8 A (non-inductive),

5 A (inductive) are provided for Alarm 1, Alarm 2 and Fault. Each relay can be set in its non-active state as energised (

Fal safe

) or de-energised. It is common practice to set the Fault relay as

Fal Safe

so in the event of power loss, the fault relay will change state. See figure 2.5 for Common Relay terminal location and figure 2.17 for contact definitions. Terminals are fitted adjacent to all relay blocks to provide 24 V dc 200 mA supplies for switching low power devices.

AUDIBLE

VISUAL

BEACON

-

+

SOUNDER

0V S1 S2

AV3

AV2

AV1

0V

Loop all connections to a second audible visual alarm if required.

Figure 2.16 Connections for AV drive

Common Alarm and Fault relay configurations can be set using the User Control Panel and Menu System.

See section

III

. Operation on page 14 for details.

NO

C

Contacts shown de-energised

(non-inverted)

NC

NC

C

Contacts shown energised

(inverted)

NO

Figure 2.17 Gasmaster contacts for all relays are identified on the terminal PCB.


2.9.3 Channel relay connections

Gasmaster 4 provides Double-Pole-Change-Over

(DPCO) relays for each channel. The relays provide a contact rating of 250 V ac 8 A (non-inductive),

5 A (inductive) for Alarm 1 and Alarm 2. Each relay can be set in its non-active state as energised

(

Fal safe

) or de-energised. Refer to figure 2.5 for location of Channel Relay terminals and figure

2.17 for contact definitions. Terminals are fitted adjacent to all relay blocks to provide 24 V dc

200 mA supplies for switching low power devices.

Channel Alarm thresholds and configurations can be set using the User Control Panel and Menu

System. See section

III.

Operation on page 14 for details.

Fire Channels

Conventional fire channels will activate both Alarm

1 and Alarm 2 relays on the affected channel in the event of an alarm. The Common Alarm 2 relay only will activate. 4-20 mA flame detectors will activate two levels of alarm as per a gas detector.

ESU Channels

If the ESU sampling device slows significantly causing reduced sample flow the Alarm 1 relay for that channel will activate. If the sampling device stops the Alarm 2 relay will activate. The

Common Alarm relays

will not

activate if the sampling device slows or stops. If the cable to the sampling device is open or short-circuited the

Common Fault relay will activate.

2.9.4 Analogue outputs

Gasmaster provides an analogue output for each channel which can be set as either 4-20 mA or

1-5 V dc by fitting a link (see Figure 2.18). These signals can be used to drive PLC/DCS/SCADA systems or remote displays. 4-20 mA outputs are current source (resolution 0.1 mA) and can drive a maximum load of 700

Ω

, 1-5 V outputs require a minimum load of 50 K

Ω

.

Analogue outputs will function in the following way:

-0 mA gas detectors:

the output will track the input from 3 to 21.5 mA, the signal will drop to

0 mA if the input rises above 21.5 mA to signal a fault. A sensor signal that is greater than 110% of range is designated by Gasmaster as a fault condition. The signal will be set to 2 mA to indicate when a channel is inhibited, and 0 mA when a channel is in fault.

Fre channels:

a signal of between 4 and 12 mA indicates a 'no-fire' condition, 12-20 mA indicates a fire, 0mA indicates a fault (open or short circuit). A 2 mA signal indicates that a channel is inhibited.

ESU channels:

a signal of between 4 and 12 mA indicates the sampling device is operating correctly, 12-20 mA indicates a sampling device failure,

0 mA indicates a fault (open or short circuit). A

2 mA signal indicates that a channel is inhibited.

0V

SIG

SCR

0V

SIG

SCR

0V

SIG

SCR

0V

SIG

SCR

LK7

Link: 1-5V

No Link: 4-20mA

LK8

Link: 1-5V

No Link: 4-20mA

LK9

Link: 1-5V

No Link: 4-20mA

LK10

Link: 1-5V

No Link: 4-20mA

Figure 2.18 Gasmaster analogue output connection terminals

2.9.5 RS-485 communications

Gasmaster can provide alarm and system information to PLC/DCS/SCADA systems via a two-wire link using the Modbus RTU protocol (9600 baud,

8 data bits, no parity, 1 or 2 stop bits). Up to 16

Gasmaster systems can be 'multi-dropped' on a single two-wire link with a maximum cable length of 1 Km, two-core twisted pair cable is recommended. Single Gasmaster systems that are to communicate via the RS-485 link should have the

RS TERM

link made, which connects a terminating resistor. For multi-dropped systems the

RS TERM

link should be removed from all

Gasmasters except the last unit on the line.

A Modbus specification document is available from Crowcon on request.


The RS-485 terminals on Gasmaster systems ordered with the optional local communications connector will be used for terminating the connector leads. These leads must be removed if a remote RS-485 serial link is required.

485A

485B

SCR

LK2

RS485

TERM

Figure 2.19 Gasmaster RS-485 terminals

2.10 Applying power

Before applying power ensure that any control or shutdown systems to which the

Gasmaster is connected are inhibited.

Once all field cables have been installed, the batteries can be connected as per the diagram attached to the chassis plate. (Refer to section

4.4.) Gasmaster will not power up until an external power supply is applied.

Apply power to Gasmaster from either the AC or

24 V dc external supplies. Outputs are inhibited for a preset time after power-up, and the system will perform a start up sequence testing alarm indicators and the internal sounder. If after a settling period faults are reported, check the sensor connections again or refer to Faults Menu on page 20.

When power is applied the green Power LED will illuminate and flash every 5 seconds to indicate that the system is operational.

If the external supply fails, Gasmaster will continue to operate from its internal batteries and the Power LED will flash every second. Depending on configuration, Gasmaster will display either a

Warning (Warning LED lights and the sounder will beep every 5 seconds) or a fault (the Fault LED and sounder will activate, and the fault relay will change state).

Gasmaster should display all channels being monitored. Allow sensors to settle before commencing calibration, refer to sensor instructions supplied with detectors for recommended settling times.

Note:

your Gasmaster is supplied pre-configured, refer to the

Specfcaton and Inspecton

Certfcate

provided with your system. If no channels are configured, Gasmaster will display the following screen:

No detectors!

Please configure

To configure your system go to page 25.

2.11 Battery back-up times

Gasmaster is fitted with 1.2 Ah batteries to provide continued operation in the event of a power loss. Examples of typical back-up times are provided below for a system in a non-alarm state, relays set as de-energised and with the 4-20mA outputs unused (system current consumption without detectors is approximately 50mA):

Gasmaster 1 with a toxic gas detector (2-wire): 21 hours

Gasmaster 1 with an oxygen detector (2-wire): 16 hours

Gasmaster 1 with a pellistor flammable gas detector: 9.5 hours

Gasmaster 1 with an Infrared gas detector: 2.5 hours

Gasmaster 4 with four toxic gas detectors (2-wire): 10 hours

Gasmaster 4 with four oxygen detectors (2-wire): 4 hours

Gasmaster 4 with four pellistor flammable gas detectors:

2 hours

Gasmaster 4 with four Infrared gas detectors: 25 minutes

Gasmaster incorporates protection to prevent the internal batteries being damaged by being deeply discharged. When operating from internal batteries, Gasmaster will display a "Warning

- battery low" fault message when the battery voltage drops to 22 V. When the voltage drops to approximately 20 V, the batteries will be automatically disconnected. The batteries will only be re-connected when the external power supply is re-instated, and will take approximately 18 hours to fully re-charge.

Installaton

Note:

The internal batteries may not be charged efficiently when Gasmaster is powered from an external dc supply, and therefore the back-up function may not work if the external supply fails

Please contact Crowcon for further advice.

2.12 Commissioning

Note:

it is strongly recommended that persons intending to commission a Gasmaster system first read and understand the Operating instructions provided in section

III.

Operation.

When all field devices have been connected and powered-up, commissioning can commence. Gas detectors should be calibrated according to their instructions, fire detectors should be tested using appropriate tools.

Alarms should be simulated and actions noted to ensure that the system operates as intended. All warning devices should be checked, and interfaces with auxiliary equipment should also be verified. The test and View menu's are provided for this purpose (see page 23 and 26).

2.12.1 Zero adjustment and calibration

Calibration must be carried out separately on individual gas detectors on Gasmaster. Follow calibration instructions supplied with each detector. Ensure at all times the local legislation and codes of practice are complied with.

Allow detectors to stabilise for at least one hour before commencing calibration. Refer to detector manual for more information.

Gasmaster provides Zero and Calibration Wizards to enable you to carry out calibration easily. These are accessed through the Operator Display Panel and Menu System. Section

III.

Operation provides detailed information on the menu structure and operator buttons.

Zero adjustment

1. From the normal operating display, press the

Continue

button to enter the menu system.

2. Use the

Up

and

Down

buttons as necessary to select

Supervisor

and press

Continue

.

GasMaster

3. You will be asked to enter a

password

, press

Continue

.

The default password is ZZZ (uppercase), use the

Up

and

Down

buttons to enter the first character of the password.

Note:

Double click the

Up

or

Down

button to move to the top or bottom of the alphabet list. To enter numbers or lower case characters, continue pressing the

Up

or

Down

button.

When you have selected the correct character, press

Continue

, the cursor will move to the next character position.

Continue entering the rest of the password. When you have finished press the

Continue

button twice.

(See 3.7 in section

III.

Operation for details of entering text strings).

4. The Zero Wizard offers temporary Inhibit but you may wish to Inhibit all channels during the calibration process.

How to set global inhibit:

From the

Supervisor

menu, scroll down to

Inhibit

and press

Continue

. Select

All

and press

Continue

. Use the

Up

or

Down

button to set inhibit to

INHIBIT=ON

, press

Continue

to accept. Use the

Back

button to return to the

Supervisor

menu. The Inhibit icons will appear on the channel display.

How to set channel inhibit:

Channel inhibit can be selected from the

Inhibit

menu or within the

Zero

or

Calibrate

menu. Follow the instructions provided above, selecting the

Channel

#n

(where n represents the channel number) in place of

All

.

5. From the

Supervisor

menu, use the

Up

and

Down

buttons to select

Zero

by pressing the

Continue

button.

6.

Select the channel to apply zero. Press the

Continue

button to step through the Zero Wizard.

7. Press

Continue

when

‘…Only continue if in clean air!…’

is displayed, ensure the detector has been


correctly zeroed first (i.e. 4 mA)

Press

Continue

to apply

Zero now

.

Gasmaster will display zero is successful or

‘Pass’

when

‘Fail’

if the detector zero is out of range.

8. Use the

Continue

button to Zero other channels or

Back

button to the

Supervisor

menu to continue calibration.

Calibration

1. Follow points 1 to 3 above in Zero adjustment to enter

Supervisor

mode.

2. Before you commence calibration, ensure the channels are inhibited prior to applying gas. Channels can be inhibited globally or individually.

Follow the instructions given in step 4 in

Zero Adjustment.

3. From

Supervisor

menu, scroll down and select

Calibrate

.

4. Select the channel to calibrate. Press the

Continue

button to step through the

Calibrate Wizard. Ensure the channels are inhibited prior to applying gas.

5. The next wizard screen displays the default calibration gas concentration as

50% of range. If necessary this calibration figure must be adjusted to match the concentration of the calibration gas used.

Adjust the value using the

Up

and

Down

buttons as necessary and press

Continue

.

6. When "Apply Gas" is displayed, apply gas to the detector and press

Continue

, allow readings to settle.

7. Press

Continue

when the reading on the appropriate channel is stable, and the detector has been calibrated according to its instructions.

Gasmaster will display

‘Pass’

when successful or

‘Fail’

signal is out of range.

if the detector

8. Calibration is complete when

‘Purge’

is displayed, remove the gas from the detector.

Use the

Continue

button to calibrate another channel or

Back

button to exit

Supervisor

mode and return to the main display.

9. Ensure that all channel inhibits are removed after calibration is complete.

2.12.2 Testing fire channels

To test

smoke detectors,

inhibit the relevant FIRE channel and use a smoke test aerosol to test each detector on a loop in turn. The channel display will indicate FirE when the detector activates.

Each detector on a loop should be reset before testing the next to ensure that all detectors activate the alarm.

Heat detectors

can be tested with a heat-gun using the same method as described above.

Flame detectors

can either provide a signal using contacts, or a 4-20 mA signal.

A contact type detector will be connected as a conventional fire loop using 470

Ω

series resistors and a 1K8 end of line resistor and will only indicate FIRE or FAULT. A 4-20 mA detector will be connected directly as a 4-20 input, and may have various alarm levels to indicate UV or IR activation

(please refer to the instructions supplied with the device for details). Flame detectors require a UV or

IR torch (depending on detector type) to simulate alarms. Inhibit the relevant channel, shine the torch at the detector and check that FirE is shown on the Gasmaster display. For 4-20 mA detectors, also check that the appropriate alarm level is displayed.

2.12.3 Testing ESU channels

To test a channel monitoring an ESU sampling device, inhibit the channel and manually slow the device, check that Alarm Level 1 is activated.

Manually stop the device and check that Alarm

Level 2 is activated. If the alarms do not activate the thresholds may need changing, refer to section

3.10 for details on how to change alarm levels.

When commissioning is complete ensure that the system is left fully functional with no faults present and no channels inhibited.

Operaton GasMaster

III. Operation

Every Gasmaster system is pre-configured by

Crowcon, please refer to the

Specfcaton and

Inspecton Certfcate

provided with the product for configuration details. This section describes the operation of pre-configured units, and includes procedures for altering settings.

3.1 Gasmaster Operator Panel

The Operator Panel allows you to communicate with Gasmaster. Use it to monitor the status of all attached field devices, determine system settings and configuration of field devices. Figure

3.1 shows the Operator Panel and typical display under normal, non-alarm monitoring conditions.

Fault LED

Accept/

Reset

Up

Down

Power LED

#1=CH4

#3=O2

#2=H2S

#4=Fire

1

Alarm LED

Warning LED

M essage and channel reminder display area

Back

Continue

00 LEL

2

Channel display area

3

00 V/V

PPM

Channel number

4

#1=CH4

#3=H2S

In the event of an alarm, this message area will display the channels in alarm and their location.

See section 3.8 for more information on alarm conditions.

ALARM:

Boiler room

#2=O2

#4=FIRE

#1=CH4

If more then one channel is in alarm, the alarm message will cycle through all messages.

In the case of a fault (or warning), brief details of the fault will be displayed. See section 3.9 for more information on fault conditions. Detailed fault and warning messages can be found in section 3.10.

FAULT: =30

Chan #3 over range..

Figure 3.1 Operator Display Panel and buttons

Gasmaster Display

The User display provides continuous readings for up to 4 field devices plus a display area for user messages and channel number summary.

Gasmaster 1 provides display for one field device plus the message area.

Message display area

In normal, non-alarm condition, the message area displays the channel numbers and detector types, e.g. CH4 refers to methane detector, see following example.

The # symbol represents the channel number (i.e.

#1 is channel 1).

Note:

User messages longer then sixteen characters are displayed as scrolling text.

If fault and alarm conditions are present at the same time, alarm messages take priority.

Channel display area

Gasmaster 4 has a large clear display which shows all gas levels simultaneously. Gasmaster 1 has a display for one gas level only, see figure 3.2. The image below shows details of the channel display area and icons that are used on Gasmaster.

GasMaster Operaton

Fault

Warning

Alarms

Gas reading

#1=CH4

1

2

00 LEL

Channel number

00

00

PPB

PPM

LEL

V/V

Units

Figure 3.2 User display Gasmaster 1

Display panel LEDs

The LEDs on the Gasmaster Display Panel indicate the following:

Yellow Fault LED:

Lights when any detector or system fault is detected (see page 23 for a list of fault messages). The fault LED operates with the common fault relay, and can be set as latched or non-latched dependant on the system configuration.

Yellow Warnng LED:

Lights when a warning condition is present

(see page 25 for a list of warning messages).

The warning LED will automatically reset when the cause is cleared.

Green Power LED:

Is normally on when power is present, and will switch off briefly once every five seconds to indicate that the system is operational. The

LED will flash on and off every second when

Gasmaster is operating from its batteries due to power failure.

Red Alarm Bar:

Will flash when an alarm from any channel is triggered, and will remain in a steady 'on' state when the accept/reset button is pressed. The LED bar will flash again if a new alarm is triggered.

Operator Panel Buttons

Use the five operator buttons to respond to alarm conditions, examine the status of system settings, and configure Gasmaster.

ACCEPT/RESET

Press the

Accept/Reset

button to mute the internal sounder and external alarms.

When alarm or fault conditions have cleared, press

Accept/Reset

again to reset the system.

Double-click the

Accept/Reset

button to exit the menu system and return to message display.

UP and DOWN

Use the

Up

and

Down

buttons to scroll through menu items.

Press and hold the

Up

or

Down

button to move quickly through the menu items.

Double-click the

Up

or

Down

button to move directly to the top or bottom of the alpha-numeric characters when configuring text or entering the Supervisor password

In

Supervisor

Mode (see section 3.7), use the

Up

and

Down

buttons to change values or settings.

In normal, non-alarm conditions, press and hold the

Up

and

Down

buttons to adjust the message display area brightness.

CONTINUE

Use the

Continue

button to display available menus. The menu system can be accessed during normal channel monitoring, alarm or fault condition. Gasmaster has four standard menus plus one advanced menu. See figure 3.4 on page

24 for an overview of Gasmaster’s Menu

System. The standard and advanced menus are as follows:








Faults

.

Lists the fault conditions present

Warnings

.

Lists the warning conditions present

View

.

View current status of relays, outputs, detector inputs, power supply and configuration





Action

.

Perform routine operations: tests of control panel or audio visual alarms

Supervisor

.

Perform password protected supervisor functions: inhibit channels, calibration, testing and configuration

Use the

Continue

button and the

Up

and

Down

buttons, to navigate through the menu system. Use the

Continue

button to select and action menu items, submenus and wizard menus.

During editing and configuration of

Gasmaster, use the

Continue

button to accept changes made to settings.

BACK

Use the

Back

button to exit the menu system or cancel actions. Double-click the

Back

button to cancel text edits or return to the main menu.

3.2 Gasmaster start up sequence

At power up during Gasmaster installation, or when Gasmaster is restarted, Gasmaster will initialise the system by performing a self-test. The start up sequence is shown below:

Display and AV test

GASMASTERII

= Software version number

...Gas detection you

#1=CH4

#3=H2S

scrolling text

#2=O2

#4=FIRE

3.3 How to adjust display contrast

To edit the display contrast press and hold the

Up

button to increase contrast, and

Down

to decrease contrast. The contrast level will be displayed.

Menu contrast

=

+++++......

The menu display contrast is altered independently from the channel display area. Press the

Continue

button whilst still in the Menu

Contrast screen, use the

Up

or

Down

button to choose Menu Display or Channel Display.

Press

Continue

to select. Adjust the display contrast as described above. Press the

Back

button to finish.

3.4 How to display Instrument serial number and system identity

The system identity and instrument serial number can be displayed during normal channel monitoring, alarm or fault conditions.

To display the system identity and instrument serial number, press and hold the

Back

button.


First the Local Service telephone number is displayed followed by the customer identity display.

After 10 seconds the serial number will automatically be displayed on the next screen (for approximately 4 seconds).

The

Continue

button can be used to advance to the next screen. Use the

Back

button to return to the previous screen. The display will return to the normal operating display when finished.

3.5 Using the menu system

To enter the menu system press the

Continue

button. The menu system can be accessed during normal channel monitoring, alarm or fault condition. The message area will display the following screen:

MENU:

Faults

Note:

if the menu system has been accessed previously, the menu item displayed will be the last actioned menu item. For example, if you were using Supervisor mode the last time, the menu display will show this:

MENU:

Supervisor

Use the

Up

and

Down

buttons to scroll through the menu list. To exit the menu press and hold the

Accept/Reset

button or press

Back

button as many times as necessary.

Menu display

The top line of the message area displays the current menu level. Some menu levels have submenus and wizards that guide you through configuration. The lower line displays the menu item, value or setting.

Use the

Up

and

Down

buttons to scroll through the menu list, press

Continue

to select the menu item.

Refer to figure 3.4 on page 24 for an overview of the menu system.

Menu wizards

Wizards are an extension of the menu system to guide the user through a process such as calibration. A wizard menu will consist of selections, user prompts and display status conditions during the process.

The

Back

button can be used to return to the previous screen or abort the wizard. The

Down

and

Up

buttons are used to alter a selection.

The

Continue

button accepts the current selection and continues to the next step of the wizard.

Wizards are available for

Zero

and

Calbraton

menus in

Supervisor

menu.

3.6 Inhibiting channels

Inputs can be temporarily inhibited so as not to cause alarms. This may be necessary when calibrating detectors, or when operations are carried out close to a sensor which may trigger an alarm

(for example, soldering near a smoke detector).

Input channels can be inhibited individually or all at once. The 'inhibit' option is available in the

Supervisor Menu, see the Menu System Overview on page 23 for details on how to access this function.

When inhibited Gasmaster will:



Display the 'inhibit' symbol on the channel display for each affected channel.



Illuminate the yellow 'Warning' LED.

In the event of an alarm on an inhibited channel,

Gasmaster will:



Illuminate the Alarm symbol on the channel display for the affected channel.



Illuminate the red alarm LED bar.



Display the alarm text message for the affected channel.

Gasmaster

will not:



Operate any relays associated with the affected channel.



Drive external audible visual alarms.



Activate the internal sounder.


If it is necessary to permanently disable a channel, enter Supervisor Mode and set the relevant detector Type to Unused (see page 21 section 3.10).

The channel display will then blank, and the power supply will be removed from the detector.

Warning

Crowcon strongly recommends that remote inhibit switches be key operated only, and that access to the key should be restricted to authorised personnel. A Gasmaster system that has been inhibited without other safety precautions being in place may not provide the protection for which it was designed.

Steps should be taken to ensure that all appropriate personnel are aware when a

Gasmaster system is inhibited.

3.7 Using the Control Panel in

Supervisor Mode

Supervisor mode provides all the functions required for trained personnel to perform system installation and configuration of field devices. This area is a password protected to prevent mis-use or accidental changes.

From the operator panel, you can select menu items and associated values to configure relays and field devices. All the menu items are explained in section 3.10, page 21.

You can modify settings by:



Selecting values from a list



Editing numeric values



Editing text strings

How to enter Supervisor mode

1. Press the

Continue


2. Use the

Up

and

Down


Supervisor

and press

Continue

.

3. You will be asked to enter a password, press

Continue

. Use the

Up

and

Down

buttons to enter the first character of the password. The default password is ZZZ.

Note:

Double click the

Up

or

Down


Up

or

Down

button.

For convenience, after the first character has been entered, the next character will start from the same point in the alpha-numeric list. To enter ‘ZZZ’ use the

Up

and

Down

buttons to enter the first letter, then simply press

Down

then

Continue

,

Down

then

Continue

.


Continue


Continue entering the rest of the password. When you have finished press the

Continue

button twice.

Note:

When the Supervisor mode is active the

Warning LED on the control panel will illuminate

How to select values from a list

1. With the menu item selected use the

Up

and

Down

buttons to scroll through the available list items. When the value you require is displayed press the

Continue

button.

For example, when configuring the Units of a channel, the possible settings are: none, FIRE, PPB, PPM, %LEL and %VOL, as you scroll through the list the unit symbol will appear on the display.

Press

Continue

to make a selection.

The menu screen will return to the next menu item in the list.

How to edit values of parameters

1. With the menu item selected press the

Continue

button. Use the

Up

and

Down

buttons to change the parameter value. Press

Continue

to accept new value.

The menu screen will return to the next menu item in the list.

How to edit text string values

1. With the menu item selected press the

Continue

button. A flashing cursor will appear below the first character of

0


the text string, you are now in edit mode. Use the

Up

and

Down

buttons to scroll through the character values. See

Appendix D for more information

Note:

Double click the

Up

or

Down


Up

or

Down

button.


Continue


Note

: The next character will start from the last one selected.

If you are editing a current text string, press

Continue

to accept a character you wish to keep.

To delete characters press the

Back

button, all characters will be deleted to the right of the cursor.

If a text string is deleted in error, double-click the

Back

button to exit the menu item. The original text string will be retained.

Continue entering the rest of the text string. To finish press the

Continue

button once more.

3.8 In the event of an alarm

In the event of an alarm the message display area will display the channel in alarm and the detectors location (if this information has been pre-set in the configuration), the Alarm LED will flash, the internal sounder and any dedicated audible visual alarms will activate, and any external alarm apparatus connected through the channel relays will operate. If more then one channel goes into alarm, the display will cycle through the channels in alarm. Channel display area in the Figure 3.3 shows channel #2=CH4 (methane) in alarm condition. The gas reading will cycle back and forth between the channel type and the gas reading.

Gas detectors

The channel or channels in alarm will display an alarm symbol and flash alternately with the type of the detector in the channel display. Gasmaster provides low and high alarm levels, these levels are user configurable and can be set as rising or falling.

Fre detectors

Fire detectors in alarm will display

FIRE

in the channel display. There is only one level of alarm for fire channels.

Envronmental samplng Unts (ESU)

ESU sampling devices that have slowed or stopped will display ESU. Level 1 means slow, level 2 means stopped

To mute the sounder

Press the

Accept/Reset

button on the operator panel (or remote Accept/Reset switch if fitted).

The Alarm LED will stop flashing, but remain lit.

The channel display will show the gas reading.

When alarm conditions have cleared, press the

Accept/Reset

button to clear any latched alarms.

2

00

LEL

Figure 3.3 Example system in alarm

3.9 In the event of a fault

In the event of a fault the fault LED will illuminate and the internal sounder will activate. The message area will display

FAULT

: and fault ID number. The fault description will appear in the lower portion of the message area, messages longer then 16 characters will be scrolled across the screen.

Pressing Accept/Reset will clear the fault message from the display. To display a list of all faults present, use the faults menu.

A list of faults can be found in the menu system overview on page 24.

3.10 System Configuration

Your Gasmaster system is supplied pre-configured, however, you may wish to configure relay

Operaton

and alarm settings to suit your requirements or adjust detector values, carry out calibration and other confidence checks. Your Gasmaster system can be configured using the Operator Panel and

Menu System. You will find details of the menu structure and configuration options over the next few pages, refer to figure 3.4 for an overview of the menu structure.

To edit your systems configuration you must enter the Supervisor mode which is password protected to prevent miss-use or accidental change. (Refer to section 3.7 for details on entering Supervisor mode.)

For more information on testing your Gasmaster system, please go to the Maintenance section on page 34.

Gasmaster PC software is available which enables full system configuration from a PC. An optional communications port is required if Gasmaster PC is to be used, contact Crowcon for details.

3.10.2 Re-configuring a channel

Your Gasmaster system is supplied pre-configured, but you may require to re-configure when a detector is changed or a new detector is added.

This section provides details on configuring channels, refer to page 31 ‘Channels #1 to #4’ from the Supervisor configuration menu.

3.10.3 Limitations

If Gasmaster is used in a manner not specified in this manual, the protection provided may be impaired.

GasMaster

GasMaster Menu system overvew

Menu system overview

Over the next few pages you will find a detailed description of the menu system. Use figure 3.4 as an overall guide to locate menu items.

Gasmaster has five standard menus: Faults, Warnings,

View, Actions and Supervisor. Only the Supervisor menu allows you to configure Gasmaster.

This section contains tables that list the menu items for each menu and the available values.

Faults menu

(lists faults present on the system)

See 3.7 'Using the Control Panel in Supervisor

Mode’ on page 20 for instructions on how to alter settings.

Note:

The display only shows two lines of information at a time. Use the

Up

and

Down

buttons to see additional menu items or values.

Use

Continue

to select choices and

Back

to exit menu.

Menu Item Values

(as shown on display)

Description Fault codes

No faults

Faults

(end of list)

Measurement system failure!

Warning - Battery low

Relay power supply fail

Main supply fail

NVM hardware fail

Loaded default settings

No faults are present

Fatal fault, contact Crowcon. 1 or 2

Input supply has failed and internal 4 battery supply has dropped to 22 volts.

Power rail to the relays has failed and 5 relays will no longer operate. Contact

Crowcon

Main supply has failed and the system 6 is running on batteries

Fatal fault, contact Crowcon.

System has returned to standard configuration settings. Re-configure using the Supervisor menu.

7

8

Common relay fail

Chan #1 relay fail

ESU #1 stalled!

ESU #1 slow!

Chan #1 over range

Coil fault detected. Contact Crowcon 9, 10, 11

Channel relay coil fault detected.

Contact Crowcon.*

12 to 19

ESU sampling device has stopped.*

ESU sampling device has slowed.*

20 to 23

24 to 27

Chan #1 under range

Detector input signal is over 21.5 mA. 28 to 31

Investigate cause at detector taking necessary precautions as high gas levels may be present.*

Detector input signal is under 3 mA. 32 to 35

Check detector.* If the 'Interpret

2 mA' command is set to Warning or Inhibit in the channel configuration, this fault message will display when the input signal drops below 1mA.

* #1 denotes the channel number and therefore may read #2, #3 or #4 on Gasmaster.

The fault codes are numbered to relate to a particular channel where appropriate (e.g. fault code 19 means there is a fault on Channel 4 Level 2 alarm relay).

Menu system overvew GasMaster

Press

CONTINUE

Faults

Warnings

View

Action

Supervisor

Faults Menu

Lst of faults present

Warnings

Menu

Lst of warnngs present

View:

Relay com stat

Alarm L1 common

Alarm L2 common

Fault common

View:

Configuration

System

Language

AV drive

Relay common

Channels 1 to 4*

View:

Relay chan stat

Alarm L1

(Channels 1 to 4)*

Alarm L2

(Channels 1 to 4)*

View:

Configuration:

Relays common

Alarm L1 common

Alarm L2 common

Common Fault

Note:

* Menu items are hidden for unused channels

† Visible only for 4-20 mA

Sink/SRC

‡ Visible only for Fire conv type

^Not present for Alarm 2

View:


Channels 1 to 4*

Type

Name

Location

Units†

Range†

Zero suppression†

Interpret 2 mA†

Stab time

Fire reset time‡

Alarm 1

Alarm 2

(

See Supervsor confguraton)

Figure 3.4 Overview of Gasmaster Menu system

View Menu

Relay com stat

Relay chan stat

Output status

Input status

Supply status

Configuration

Action Menu

Display contrast

Control panel

Audio visual

All Supervisor Menu options are password protected, see page 20 for details of this menu section.

Supervisor:

Test

Relays common

Channels 1 to 4*

Supervisor:


Relay common

Alarm L1 common

Alarm L2 common

Common Fault

Supervisor:


Channels #1 to 4*

Alarm 1 & Alarm 2

Direction

On threshold

Off threshold^

Relay type

Relay drive

Indication^

Supervisor

Menu

Password

Inhibit

Zero

Calibrate

Test

Configure

Supervisor:

Configuration

System

Language

AV drive

Relay common

Channels 1 to 4*

Supervisor:


Channels #1 to 4*

Type

Name

Location

Units†

Range†

Zero suppression†

Interpret 2 mA†

Stab time

Fire reset time‡

Alarm 1

Alarm 2


Warnings menu

(lists .warnings .present .on .the .system)



Description Codes

No warnings (end of list)

Warnings

Supervisor mode

No warnings are present.

System configurations may be changed.

Global inhibit All input channels are inhibited.

Testing audio visual alarm Audible visual outputs will be driven.

Service/calibration due Service or calibration interval has expired.

Common relay forced

Main Supply Fail

1

2

3

4

Common alarm or fault relays are being forced 5, 6, 7 to their 'alarm' state.

Main supply has failed and the system is running on batteries

8

Detector #1 stabilising

Detector #1 input low

Detector is currently in its stabilisation or reset 9, 17, 25, 33 period*, (see page 30).

Detector input signal is between 1 and 3 mA.* 10, 18, 26, 3

Only applies when the 'Interpret 2 mA' command is set to Warning in the channel configuration.

Detector #1 initiated inhibit

A 2 mA inhibit signal has been received from a 11, 19, 27, 35 detector.* Only applies when the 'Interpret

2 mA' command is set to Inhibit in the channel configuration.

Chan #1 inhibited Input channel is in an inhibit state* . 12, 20, 28, 36

Chan #1 input simulated Channel input is being forced in Test mode.* 13, 21, 29, 37

14, 28, 30, 38 Chan #1 output forced

Chan #1 relay forced

Channel analogue output is being forced in

Test mode.*

Channel alarm relay is being forced in

Test mode.*


15, 16, 23, 24

31, 32, 39, 40


View menu

(shows .system .status .and .configuration, .but .does .not .allow .changes .to .be .made .)



Description

Relay com stat

Alarm L1 common

Values = No alarm

In alarm

Alarm L2 common

Values = No alarm

In alarm

Fault common

Values = No alarm

In alarm

Relay chan stat

Alarm L1 #1

Values = No alarm

In alarm

Alarm L2 #1

Values = No alarm

In alarm

L1 = Level 1.

L2 = Level 2

The 'values' show the current state of each relay

(relays may be normally energised or de-energised dependant on configuration):

'No alarm' means the relay is in its normal state.

'In alarm' means the relay is in its alarm or fault state.

#1 refers to the input channel, use the Down button to scroll to channels #2, #3, #4 if appropriate.

L1 = Level 1.

L2 = Level 2 (use the down key to view level 2).



'No alarm' means the relay is in its normal state.

'In alarm' means the relay is in its alarm state.

Output status

Output #1

Values = 0.0 to 25.5 mA


The 'values' show the current analogue output level for a channel.

Input status

Input #1

Values = 0.0 to 66.7 mA,


The 'values' show the current signal input level for a channel.

Supply status

Supply

Value = 19.8 to 40 V

Configuration

See table

Supervisor menu

:

Indicates the DC supply level from either the internal

PSU or an external DC supply.



Actions menu

(allows .basic .tests .and .adjustments .)



Description

Audio visual

Audio Visual:

Test alarm?

Values = Testing beacon

Testing alarm L1

Testing alarm L2

Test complete

Control panel

Control Panel:

Start test?

Test complete

Display contrast

Display:

Values = Menu contrast

Channel contrast

Drives Audible Visual alarm terminals to test external audible visual alarms

Beacon output becomes active for 3 seconds, followed by;

Sounder level 1 output becomes active for 3 seconds, followed by; followed by;

Sounder level 2 output becomes active for 3 seconds,

Outputs de-activate and display returns to the Audio

Visual menu

Press Continue to test LCD display, LED's and internal sounder for 3 seconds. Display returns to Control

Panel menu

Alters the message display area contrast

Use the Up and Down buttons to adjust the contrast of the LCD


.

Supervisor menu

(allows .system .tests .to .be .performed, .and .configurations .to .be .changed . .A .pass .

.

word .is .required .to .enter .this .mode, .see .section .3 .7 .for .details .)



Inhibit

Zero

Calibrate

All

Values = Inhibit off

Inhibit on

Channels #1, #2, #3, #4

Values = Inhibit off

Inhibit on

Zero Wizard

Select channel

Values = #1=name

#2=name

#3=name

#4=name

Select channel Inhibit

Values = Inhibit on

Inhibit off

User confrmaton

Only continue if in clean air!

Result

Values = Pass

Fail

Calibration Wizard

Select channel

Values = #1=name

#2=name

#3=name

#4=name

Cal #1 level

Values = 25% - 100% of range

Description

Inhibits all input channels when selected.

Only whilst in Supervisor mode used for calibration and test

Allows individual channels to be inhibited.

NB: Inhibit persists on exit from Supervisor mode

Use Down button to select the required channel to zero, then follow wizard instructions.

Inhibit option will not be displayed if channels have already been set to inhibit using the menu shown above.

Reminds the user to check that the detector has been zeroed and is currently not seeing gas.

Channel has correctly zeroed

Input signal was out of acceptable range, re-zero the detector and check that its output current is 4 mA.

Use Down button to select the required channel to calibrate, then follow wizard instructions.

Select channel Inhibit

Values = Inhibit on

Inhibit off

User acton

Apply gas

User confrmaton

Continue when reading is

stable

Refers to the calibration gas concentration

Calibration is only possible with a gas concentration that is at least 25% of the full range of the sensor.

Use the UP and Down buttons to enter the concentration of the calibration gas (e.g. 50% LEL,10 ppm etc.).

Gasmaster will store the gas value entered so that it does not need to be adjusted next time the sensor is calibrated.

Inhibit option will not be displayed if channels have already been set to inhibit using the Inhibit menu.

Apply gas and calibrate the detector.

Press Continue when the detector has been calibrated and is providing the correct output signal.


Supervisor menu

.


.word .is .required .to .enter .this .mode, .see .section .3 .7 .for .details .)



Calibrate Calibration Wizard cont.

Result

Value = Pass

Fail

User acton

Purge gas

Test Relay common

Use to simulate inputs and outputs for testing and commissioning purposes.

Relay alarm L1

Alarm L1 common

Values = No alarm

In alarm

Relay alarm L2

Alarm L2 common

Values = No alarm

In alarm

Fault

Fault common

Values = No fault

In fault

Channel #1, #2, #3, #4

Sim Input #1

Values = 0.0 - 25.5 mA

0.0 - 66.7 mA

for fire detectors

Force output #1

Values = 0.0 - 25.5 mA

Description

Channel has correctly calibrated.

Input signal was out of acceptable range, re-calibrate the detector and check that its output current is proportional to the gas level

Reminds the user to remove the calibration gas and re-expose the detector to clean air.

Forces common level 1, 2 or Fault relays.

L1 = Level 1.

L2 = Level 2



'No alarm' or ‘No fault’ means the relay is in its normal state.

'In alarm' or ‘In fault’ means the relay is in its alarm or fault state.

Use the Up and Down buttons to change the relay state, press Back to exit, the relay will return to its normal state

Use the Up and Down buttons to select the desired channel. The channel warning symbol

 will show.

Channel alarm relays can be tested as described above.

When selected, displays the input signal level for the selected channel (e.g. 4.1 mA).

The channel warning symbol



will show.

Use the Up and Down buttons to force the input to the required level. The reading on the channel display will change accordingly and alarms will activate at the preset points.

Use the Accept/Reset button to silence alarms if necessary. Press Back to exit, the input will return to its normal state.

When selected, displays the analogue output signal level for the selected channel (e.g. 4.1 mA).


 will show.

Use the Up and Down buttons to force the output to the required level.

No alarms will be activated on Gasmaster. Use to test remote displays.

Press Back to exit, the input will return to its normal state.


Supervisor menu

.





Relay alarm L1

Values = No alarm

In alarm

Relay alarm L2

Values = No alarm

In alarm

Configure

Select from config sub menus

Use to change below system settings

System

ModBus addr

Values = 1 to 254

Serial comms

Values = 9600, 8, N, 1

9600, 8, N, 2

Identity

Values = 16 character string

Description

Forces level 1, 2 relays for the selected channel.




will show.

Contact orientation will depend on whether the relay is configured as normally energised or de-energised.

Press Back to exit, the relay will return to its normal state.

Required for RS-485 digital communications only, any address in the range can be chosen. If multiple units are connected on an addressable loop to a

'Master' controller, each Gasmaster must have a different address.

Describes the required RS-485 communications parameters; Gasmaster is factory set to 2 stop bit.

Language

AV drive

Mains Fail

Values = AS WARNING

AS FAULT

Language

Values = English (UK) configurable

Beacon type

Values = Latched

Non-latched

Sounder type

Values = Latched

Non-latched

Latch-accept

Allows a system name to be entered which will be shown on the Gasmaster display when the appropriate mode is selected (see section 3.4). Use the Up and Down buttons to enter required alpha-numeric characters and press Continue to accept.

Determines whether a main supply fail is treated as a fault or a warning

The default display language is English. A second language may be available depending on system configuration.

Determines the operation of beacons connected to the 'AV1 Drive' terminal.

Latched

means that in an alarm state, the beacon will continue flashing when the Accept/Reset button is pressed, and will only stop flashing when the alarm is cleared and the Accept/Reset button is pressed again.

Non-latched

means that the beacon will continue flashing when the Accept/Reset button is pressed, but stop automatically when non-latching alarms have reset.

Determines the operation of sounders connected to the 'AV2/3 Drive' terminals.

Latched

means that in an alarm state, the sounder will continue to operate when the Accept/Reset but ton is pressed, and will only stop sounding when the alarm is cleared and the Accept/Reset button is pressed again.

0


Supervisor menu

.





AV drive cont.

Relay common

Alarm L1 common

Type

Alarm 1 type

Values = Latched

Non-latched

Latch-accept

Drive

Alarm 1 drive

Values = De-energised

Energised

Description

Non-latched

means that the sounder will continue to operate when the Accept/Reset button is pressed, but will silence automatically when the alarm has cleared.

Latch-accept

means that in an alarm condition the sounder will silence when the Accept/Reset button is pressed.

Determines the operation of the common alarm and fault relays.

L1 = Level 1.

L2 = Level 2

Latched

means that in an alarm state, the relay will stay active when the Accept/Reset button is pressed, and will only reset when the alarm or fault has cleared and the Accept/Reset button is pressed again.

Non-latched

means that the relay will stay active when the Accept/Reset button is pressed, but will reset automatically when the alarm has cleared.

Latch-accept

means that in an alarm or fault condition the relay will reset when the Accept/Reset button is pressed.

De-energised

means that the relay coil is not energised in a non-alarm state (normally de-energised).

Energised

means that the relay coil is energised in a non-alarm state (normally energised or 'fail-safe')

Alarm L2 common

Type

Alarm 2 type

Values = Latched

Non-latched

Latch-accept

Drive

Alarm 2 drive


Energised

Fault common

Type

Fault type

Values = Latched

Non-latched

Drive

Fault drive


Energised

Channels #1 to #4

Press the Up and Down

Config Channel

#1 buttons to cycle through configuration for channels #2,

#3 and #4.

Type

Values = Unused

DET 4-20 SRCE

DET 4-20 SINK

FIRE 4-20 SRCE

Sets the input type for each channel, links on the terminal PCB must also be set to the appropriate positions (see section 2.8 for details).

No detector connected

4-20mA current source gas detector

4-20mA current sink gas detector

4-20mA current source flame detector


Supervisor menu

.





Description

Channels #

1 to #4 Cont.

FIRE 4-20 SINK

FIRE CONV

ESU

Name


Location


*Options will be shown for

4-20 mA input channels only

Units*

Values = None

%LEL

PPB

PPM

%VOL

FIRE

Range*

Values = 0 to 9999.9

*Options will be shown for

4-20 mA input channels only

Zero suppression (ZFS)*

Values = Enabled

Disabled

Interpret 2mA*

Values = Fault

Warning

Inhibit

Stab time

Values = 0 to 120 seconds

Fire reset time**

Values = 0 to 30 seconds

Alarm L1 #1, #2, #3, #4

See submenu below

4-20mA current sink flame detector

Conventional smoke/heat or call points

ESU sampling device

Detector name (e.g. CH4 for methane, O2 for oxygen, FIRE for smoke/heat detectors)

Optional. Detector location or tag, will be shown on the message display if an alarm occurs

(e.g. Boiler Room).

E.g. for an ESU channel

For flammable channels

Very low range toxic gas detectors

General toxic gas detectors

Oxygen or other high volume gases

Flame or conventional smoke/heat detectors.

Detector range (e.g. 100 for a flammable detector).

Applies suppression to the first 3% of scale to prevent small deviations from zero being displayed.

If the Level 1 alarm for a channel is set below 8% of full scale, the level of suppression is reduced.

Some gas detectors produce a 2 mA signal to indicate a certain state.

This option determines how Gasmaster interprets a signal between 1 and 3 mA.

Inhibits the input for preset time after Gasmaster is powered-up to prevent false alarms while the sensor is settling.

Time for which power is removed from smoke/heat detectors when the Accept/Reset button is pressed.

** Opton wll be shown for conventonal fre channels only


Supervisor menu

.





Description

Config channel

Submenu:

Alarm L1 #1

Direction

Values = Rising

Level 1 alarm relay

Falling configuration for each channel

Press the Up and Down buttons to cycle through configuration for channels

#2,#3,#4

On threshold

Values = 0.1 to Range

(full scale)

Off threshold

Values = 0.1 to L1 On threshold

(rising alarms)

L1 threshold to full scale - 0.1 (Falling alarms

Rising alarms required where there is normally no gas.

Falling alarms required where gas should normally be present (e.g. oxygen).

Level at which the relay will activate.

Level at which the Level 1 relay will reset. Allows hysteresis for applications such as ventilation control where the fan should continue to run until the gas reaches a low level.

Relay type

Values = Latched

Non-latched

Latch accept

Latched

means that in an alarm state, the relay will stay active when the Accept/Reset button is pressed, and will only reset when the alarm or fault has cleared and the Accept/Reset key is pressed again.

Relay drive


Energised

Non-latched

means that the relay will stay active when the Accept/Reset key is pressed, but will reset automatically when the alarm has cleared.

Indication

Values = Visible

Hidden

Latch-accept

the relay will reset when the Accept/Reset button is pressed.

De-energised

gised in a non-alarm state (normally de-energised).

Energised

means that in an alarm condition

means that the relay coil is not enerin a non-alarm state (normally energised or

'fail-safe')

Visible

means that the relay coil is energised

means that an alarm will trigger the alarm

LED bar, internal sounder, external audible visual alarms, and display the alarm message.

Hidden

means that an alarm will only cause the alarm icon in the channel display to show. No other audible or visual alarms will activate (used for ventilation control applications)

A similar menu is available for Level 2 alarm relays, with the exception that the 'Off Threshold' and

'Indication' options are not available.

Alarm L2 #1*

Direction

Threshold

Relay type

Relay drive


Mantenance GasMaster

IV. Maintenance

It is essential that any safety system such as Gasmaster is routinely checked. Crowcon offer service contracts to ensure that this equipment is fully operational at all times.

As a minimum, Crowcon recommend that systems are calibrated and tested on a sixmonthly basis. Sensors should be changed as advised in the detector manual.

Note:

a ‘calibration due’ warning message may be flagged six months after the last service*. The warning LED

 will light and the message will be shown in the Warnings Menu (see page 22). This message can be reset using Gasmaster PC, which also allows the period after which the message is displayed to be adjusted.

*Or when the system was last powered-up.

4.1 Functional Testing

Gasmaster allows you to test relays, force inputs into alarm state, and force analogue outputs to verify the correct operation of the Gasmaster system and its interfaces with external equipment.

These functions are available in the

Supervsor

menu under

Test

.

Please note that using this function will activate the appropriate relays, audible visual alarm drives and analogue outputs. Ensure necessary precautions are taken prior to using test functions.

The options available in Test can be found in section 3.10, page 26, along with a description of each function.

4.2 System Inhibit

Inputs can be temporarily inhibited so as not to cause alarms. This may be necessary when calibrating detectors, or when operations are carried out close to a sensor which may trigger an alarm

(for example soldering near a smoke detector).

Input channels can be inhibited individually or all at once. The 'inhibit' option is available in the

Supervsor

menu, see section 3.6 on page 17 and the Menu System Overview on page 20 in the

Operaton

chapter for details of this function.

If it is necessary to permanently disable a channel, enter Supervisor mode and set the relevant detector Type to Unused (see page 29). The channel display will be no longer shown, and the power supply will be removed from the detector.

Warning

Crowcon strongly recommends that remote inhibit switches be key operated only, and that access to the key should be restricted to authorised personnel. A Gasmaster system that has been inhibited without other safety precautions being in place may not provide the protection for which it was designed. Steps should be taken to ensure that all appropriate personnel are aware when a Gasmaster system is inhibited.

How to perform Inhibit

1. From the normal operating display, press the

Continue


2. Use the

Up

and

Down


Supervisor

and press

Continue

.

3. Enter the password (the default password is ZZZ), press

Continue

.

See section 3.7 in Operation for details on entering

Supervsor mode

.

4. How to set global inhibit:

From the

Supervisor

menu, scroll down to Inhibit and press

Continue

. Select

All and press

Continue

. Use the

Up

or

Down

button to set inhibit to

INHIBIT ON, press

Continue

to accept. Use the

Back

button to return to the

Supervisor

menu. The Inhibit icons will appear on the channel display.

How to set channel inhibit:

Channel inhibit can be selected from the

Inhibit

menu or within the

Zero

or

Calibrate

menu. Follow the instructions provided above, selecting the

Channel

#n

(where n represents the channel number) in place of

All

.

Ensure all inhibits are removed when maintenance activities are complete.

GasMaster Mantenance

4.3 Detector Calibration

Crowcon recommends that you check detectors routinely to ensure correct calibration and operation.

Gas detectors require recalibration at least every 3 to 6 months. Fire detectors should be tested with the same frequency. Site procedures may require more frequent testing. See section 2.12.1 page

12 for calibration instructions.

For detailed instructions on the routine functional testing of detectors, please refer to the relevant

Installation, Operating and Maintenance Instructions provided with each detector.

4.4 Changing Batteries

During routine servicing, it is recommended that the power be isolated form Gasmaster temporarily to ensure that the back-up batteries are operational. Crowcon recommend that batteries are changed every two years, and replaced as a pair.

Replacement batteries should be Yuasa UCEL

Y1.2-12, 12 v 1.2 Ah C20 lead-acid type cells.

A 10 A fuse is fitted to the batteries, for replacement part number see Spare Parts and Accessories section.

Batteries

Battery connection diagram

Warning

When replacing batteries, care should be taken to ensure cables are re-fitted as shown on the battery connection diagram. Incorrect fitment of battery cables may result in a fire and/or harm to personnel.

4.5 Module Replacement

In the unlikely event of a Gasmaster component failure, Crowcon recommend that repair should not be undertaken by anyone other than Crowcon approved personnel. Please contact Crowcon for details of your nearest service centre.

4.6 Event logging

Gasmaster records alarms, faults and display panel button activities in an Event Log. A maximum of 300 events are logged, after which data is over-written on a first-in-first-out basis. This function provides a record of all system activities which can be uploaded using Gasmaster PC software at any time.

The event log is held in RAM (volatile memory), so in the event of a complete power failure all data will be lost.

4.7 Service card

A card is fitted to the inside of the front cover for logging service activity. It is recommended that this card be filled in with the dates of services, and details of any parts replaced.

4.8 Cleaning

If required, the outside of the Gasmaster case can be cleaned by gently wiping with a damp cloth using a mild soap solution only.

Figure 4.1 Battery replacement

Batteries should be checked regularly on units operating over 40ºC.

Appendx A: Specfcatons

Appendix A: Specifications

Size

Weight

Enclosure material

Ingress protection

Power

Battery back-up

Operating temperature

Humidity

Input:

Gas

Fire

Environmental

Remote inhibit

Remote reset

Sampling Unit control

Outputs:

Relays

Audible/visual alarm drive

Analogue

Digital communications

Communications port

Event logging1

Panel indication

Approvals

Gasmaster 1

288h x 278w x 110d (mm)

4.5 kg

Back-box: Painted steel

Front cover: fire-retardant ABS plastic.

IP54

100-240 V ac 50-60 Hz 1.3 A or

20-30 V dc, 60 W max.

1.2 Ah batteries fitted internally

-10ºC to + 50ºC (14 to 122ºF).

0 to 95% RH non-condensing

One 2 or 3 wire 4-20 mA gas detector (sink or source). Adaptor for mV bridge type detectors available.

Maximum detector current 500 mA.

One loop of up to 20 conventional smoke/heat detectors or manual call points, or one flame detector (4-20 mA or digital contact signal).

For use with one Crowcon ESU sampling device.

Via normally open contact.


Low alarm, High alarm, Fault.

DPCO contacts rated at

250 V ac, 30 V dc 8 A (non-inductive load), 5 A (inductive load).

24 V dc 650 mA maximum drive (typically 2 devices max.)

4-20 mA (current source, max. loop resistance 700

Ω

) or

1-5 V dc (min. load 50 K

Ω

).

RS-485 Modbus RTU

9600 Baud

8 Data bits

No parity

2 Stop bits

Optional 3-way connector for PC configuration and event log upload

Time-stamped log of up to 300 alarm, fault or system intervention activities.

LCD back-lit display shows gas level (in ppb, ppm, % volume or % LEL units), and scrolling alphanumeric status indication.

LEDs for Alarm, Fault, Power and

Warning status indication.

Integral 85 dB sounder.

EN 50270 (EMC), EN 61010-1 (Low voltage directive)

CSA standards C22.2 NO.152 and

C22.2 No. 142

Gasmaster 4

288h x 278w x 110d (mm)

4.5 kg

Back-box: Painted steel

Front cover: fire-retardant ABS plastic.

IP54

100-240 V ac 50-60 Hz 1.3 A or

20-30 V dc, 60 W max.

1.2 Ah batteries fitted internally

-10ºC to + 50ºC (14 to 122ºF).

0 to 95% RH non-condensing

One to four 2 or 3 wire 4-20 mA gas detectors (sink or source). Adaptor for mV bridge type detectors available.

Maximum detector current 500 mA.

One to four loops of up to 20 conventional smoke/heat detectors or manual call points, or one to four flame detectors (4-20 mA or digital contact signal).

For use with one Crowcon ESU sampling device.



Low alarm and High alarm per channel plus Common Low, High and

Fault.

DPCO contacts rated at 250 V ac, 30 V dc 8 A (non-inductive load), 5 A (inductive load).

24 V dc 650 mA maximum drive (typically 2 devices max.)

4-20 mA for each channel (current source, max. loop resistance 700

Ω

) or 1-5 V dc (min. load 50 K

Ω

).

RS-485 Modbus TRU

9600 Baud

8 Data bits

No parity

2 Stop bits

Optional 3-way connector for PC configuration and event log upload

Time-stamped log of up to 300 alarm, fault or system intervention activities.

LCD back-lit display shows gas level

(in ppb, ppm, % volume or % LEL units) for all channels, and scrolling alphanumeric status indication. LEDs for Alarm, Fault, Power and Warning status indication

Integral 85 dB sounder.

EN 50270 (EMC), EN 61010-1 (Low voltage directive)

CSA standards C22.2 NO.152 and

C22.2 No. 142

1Event log access requires Gasmaster PC software and communication port. Event log data is held in non-volatile memory, data will be lost in the event of a complete sys tem power failure.

GasMaster

GasMaster Appendx B: Spare parts and Accessores

Appendix B: Spare Parts and Accessories

Part No.

E01875

E07534

M05897

M07624

S012016

S011713/2

S011714/2

E07109

S011746

S011723

M04683

M05891

M05906

M05892

M05893

C01929

E07635

C01919

C01920

C01921

C01922

E07636

S011750

S011555

M01861/2

Description

12V 1.2Ah battery

Battery fuse assembly

Service card

Installation, Operation and maintenance manual

Display PCB

Gasmaster 4 terminal PCB

Gasmaster 1 terminal PCB

Insulated Jumper links

Power supply assembly

Sounder assembly

Sounder seal

Gasmaster 4 display label

Gasmaster 1 display label

Domed Crowcon label

Domed Gasmaster label

Communications Kit

Communications port

Accessory Enclosure

Accessory Enclosure

Accessory Enclosure

Accessory Enclosure

Accessory enclosure connector

Front cover assembly for Gasmaster 1

Front cover assembly for Gasmaster 4

Comment

2 required

Assembly with fuse, fuse holder and loom

Replacement service cards, minimum quantity 10

For all Gasmaster models

No links supplied, use links from old PCB

No links supplied, use links from old PCB

Spare links for PCB's, minimum order quantity 10

Complete with wiring looms

Complete with wiring loom

For front cover

For front cover

For front cover of all models

For front cover of Gasmaster 1 and 4

Includes Gasmaster PC software, connection lead and

RS485/232 converter.

3-pin connector for fitment to Gasmaster to enable interface with the Communications Kit. Comes complete with wiring loom for connection to the RS-485 terminals.

For connecting

one

mV bridge type flammable gas detector to Gasmaster 1 or 4. Comes with the connector for Gasmaster.

For connecting

two

mV bridge type flammable gas detectors to Gasmaster 4. Comes with the connector for

Gasmaster.

For connecting

three


Gasmaster.

For connecting

four


Gasmaster.

Connector for fitment to Gasmaster to enable an

Accessory Enclosure to be connected. Comes complete with wiring loom.

Complete with labels, sounder and seals

Complete with labels, sounder and seals

Flush mounting brackets For mounting Gasmaster into a panel.

Appendx C: Dsplay characters GasMaster

Appendix C: Display characters

Message display area characters

When editing strings of text for passwords, detector location or system identity, the following characters are available:

Group1: <space> !

Group2: # $ % &

Group3: * + , - . /

Group4: 0 1 2 3 4 5 6 7 8 9

Group5: : ;

Group6: ? @

Group7: A B C D E F G H I J K L M N

O P Q R S T U V W X Y Z

Group8: _

Group9: a b c d e f g h i j k l m n o p q r s t u v w z y z

Use the Up and Down buttons as described in section 3.7 to select the required characters.

For some string types the available characters may be restricted, only the applicable characters will be shown. For example the detector name (e.g. gas type) is restricted to groups 4 and 7 (numerals and upper case) only: single clicking or holding the Up button will advance forward through the available groups of characters:

A B C D ... X Y Z 0 1 2 ... 7 8 9 A B C

... etc single clicking or holding the Down button will advance backwards through the available groups of characters:

Z Y X W ... C B A 9 8 7 ... 2 1 0 Z Y X ... etc double clicking the Up button will jump forwards to the end of the current group then on to the start of the following one etc: Z 0 9 A Z ...

double clicking the Down button will jump backwards to the start of the current group then on to the end of the following one etc: A 9 0 Z A ...

6

7

8

9

4

5

2

3

0

1

Channel display characters

NB:

The following characters represent those which can be shown on the channel display area to represent detector types.

The following characters cannot be closely represented: K, M, V, W, X

Q

R

S = 5

T

M

N

K

L

O

P

I

J

E

F

G = 9

H

C

D

A

B

W

X

U

V

Y

Z = 2 dash underscore

?

blank

b5 b6 b0

.dp

b7 b1 b3 b2 b4

Thank you for reading this data sheet.

For pricing or for further information, please contact us at our UK Office, using the details below.

UK Office

Keison Products,

P.O. Box 2124, Chelmsford, Essex, CM1 3UP, England.

Tel: +44 (0)

330 088 0560

Fax: +44 (0)1245

808399

Email: [email protected]

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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