GAS DETECTOR PORTABLE MULTI-GAS

CUSTODIAN

Latest in a distinguished line of multi-gas portable instruments comes the Custodian. The product of significant R&D investment, this instrument has been designed primarily to meet the needs of confined space workers.
However, its many features make it suitable for a host of applications requiring the monitoring of one to four gases.

Dependable
Custodian with its reputation for reliable and dependable instrument. Its robust mechanical construction and advanced electronics ensure that it will perform even in the harshest environments. Ingress Protection is to IP66. Naturally the unit is certified intrinsically safe for use in hazardous areas.

User Friendly
All aspects of the design have been considered with the user in mind. The ergonomic shape and simple pushbutton operation for function selection demonstrate this.
The display can be blanked and functions can be locked out with passwords if a tamper-proof, alarm-only detector is required. Important for the confined space worker, Custodian weighs in at 500g and is small enough to be worn in a breast pocket. A belt clip and chest harness option further increase its wearability. A carrying case and alarm earphone are available as options.

Clear Alarms and Display
A pair of ultra bright red LEDs flash in a distinctive 'police car' sequence through lenses which make them visible over a wide field of view. A loud audible sounder reinforces the message with a selectable tone. Gas readings (peak or current), scanning between sensors, are presented on a custom liquid Crystal Display with excellen contrast over a wide viewing angle. large digits for gas values are augmented by clear symbols for warnings such as low battery. A display backlight comes on when any button is pressed and turns off after 10 seconds.
State of the Art
A single chip microcontroller performs all control and measurement functions. Modern materials and injection moulding techniques have permitted a case design which is highly functional, aesthetic and easy to maintain. Ultra compact gas sensors have contributed to size and weight reductions.

Range of Sensors
3 and 4 channel instruments are available with one pellistor sensor for LEL flammable gas, up to two electro-chemical toxic gas sensors and one oxygen sensor. Sensors for % volume flammable gas and for low levels of hydrocarbons or organic solvents are available.

If less than four sensors are required, unused slots are blanked off.

Dual gas instruments are available with flammable and oxygen, or flammable and one toxic sensors.

Integral Pump
The instrument is available in diffusion or pumped format. With the pumped option, a special flow adaptor is attached to the sensor grille which automatically turns the pump on and passes sample gas over the sensors.

Programmable Alarms
For each gas channel, there are up to three instantaneous alarms. In addition, toxic gas channels have two time weighted average alarms assigned. These operate on 15 minute and 8 hour exposure periods. All thresholds may be adjusted. Instantaneous alarms may be latching or self resetting, rising or failing, and may be set so that the sounder can be silenced while the unit is still in an alarm condition. Unwanted alarms may be deactivated.

Instruments can be supplied with alarms configured to customer specification. A pass code protects the instrument against unauthorised changes.

Battery Pack
The detachable battery pack can be replaced in a hazardous zone for round the clock operation. Rechargeable packs utilise nickel hydride batteries with a life of up to 1000 charge cycles. These batteries are environmentally friendly as they do not use cadmium and are therefore easily disposable. These will power an instrument with one flammable sensor and three electro-chemical sensors for up to 16 hours. Primary (dry cell) packs requiring 4 AA cells are also available.

Easy to Maintain

Regular calibration is straightforward, utilising the built-in pump or calibration adaptor. Adjustment of gas readings is by easy push button or computer interface functions. An Autocalibrator is available to streamline batch calibration.

PC Interface
SetCustodian is a dedicated program running under Windows TM which allows full access to instrument configuration and logged data files. It also simplifies the calibration procedure.

Data Logging
Internal logging software records gas data continuously, beginning a new report when the instrument is switched on. Also running under Windows TM, LogManager software, in conjunction with SetCustodian, provides access to these data reports which may be presented in graphical or tabular format. Output files are compatible with most spreadsheets.

Special Versions
Models for gas testing (without alarms) are available using pellistor or thermal conductivity sensors. A version with a semiconductor sensor is offered for general gas leak tracing.

Specification - Custodian
Weight
500g (1.1lb)

Dimensions
155mm x 102mm x 52mm (6.1" x 4" x 2")

Typical measuring ranges
0-100% LEL flammable gas, 0-25% oxygen, 0-50ppm hydrogen sulphide, 0-50Oppm carbon monoxide, 0-1 Oppm sulphur dioxide, 0-5ppm chlorine, 0-25ppm hydrogen cyanide, 0-10ppm nitrogen dioxide, 0-5ppm phosphine, (normal combination flammable gas, oxygen and two toxic gases).

Typical alarm levels (3 per channel)
20% LEL, 19% and 23% oxygen, 1Oppm hydrogen sulphide, 50ppm carbon monoxide, instantaneous and TWA alarms (STEL and LTEL).

Response times T90
Methane 20 seconds, oxygen 10 seconds, typical toxic gas 20 seconds.

Visual alarm indicators
Ultra bright flashing red LED pair in GAS HAZARD. Slow flashing green LED shows instrument is working.

Audible alarms
Wailing siren, 85 dBA at 1 metre. User selectable tones. Intermittent sound for discharged battery. Confidence blip (selectable).

Display
Custom 7 segment high contrast LCD. 8mm character height for gas reading. Symbols for low battery, TWA alarm, blocked pump, peak hold & password protection. Bright backlight.

Operating temperature range
-20°C to 50°C (-4°F to 122°F)

Humidity
0-95% RH non condensing

Expected sensor life
Pellistor year, toxic gas 3 years, oxygen 1 year.

Detachable battery pack
1.2 Ah nickel hydride rechargeable; standard instrument battery life up to 16 hours, pumped 8.5 hours. Optional dry cell pack uses 4 x AA disposable Alkaline cells.

Aspirator/electric pump
Manual bulb type with 2m of hose, non absorbent, hydrocarbon resistant. Internal electric pump option, with auto on/oft.

Safety Certificate Nos
Ex95C2348X, Ex95C2349, Ex95Y1350

Approval code
Europe
EEx iad IIC T3/T4

USA & Canada
Class 1, Division 1, groups A, B, C, D.

Standards
Europe
EN50014, EN50020, EN50018

USA & Canada
UL 913, CSA 22.2

RF Immunity
Tested to IEC801-3 and meets EN50082-1.

RF Radiation
Tested to EN55022 class B and meets EN50081-1

Battery charging
Dual rate charger for instrument or detached battery pack. Fast charge in 6 hours, trickle charge will not damage batteries. A multiple unit charger is also available. Input 100-250V AC, 12-30V DC.

TRIPLE PLUS

Triple Plus gas detectors are renowned throughout the world. Their effectiveness in protecting people against flammable and toxic gas hazards as well as deficiency or enrichment of oxygen has been proved time and time again and their robustness means that they operate with little maintenance in the most arduous conditions.

Choice of Sensors

Whilst most multi-gas portable instruments are built to monitor methane, hydrogen sulphide and oxygen, Triple Plus can be fitted with any practical combination of pellistor, electro-chemical or thermal conductivity sensors. So the Triple Plus range includes dual, triple and quadruple gas models.

Autoranging Flammable Gas Version
This incorporates both pellistor and thermal conductivity sensors. The software switches off the pellistor when the Lower Explosive Limit of the gas is exceeded and displays the gas concentration in % volume.
Purpose Designed Electronics

The major electronic components are surface mounted on a single board with a daughter board for the intrinsic safety critical components. The two line, 24 character dot matrix LCD display will show up to four gas channel readings simultaneously. A button operates a back light which turns off after 30 minutes.

Simple Controls

In normal operation, the sounder gives a confidence blip once every three seconds and a green LED flashes.
In the event of an emergency, a large bright red LED comes on, and a loud alarm will be heard. The gas level can be read from the display. Readings for toxic gases can be set to show either the current level or the timeweighted average (TWA) level since switch on. Alternatively the display can be set to freeze peak values.
Real and elapsed time since switching on are available on the display.
Versatile Alarm Modes
Alarms for flammable gases (normally set to 20% LEL) and oxygen (normally set to 19% and 23%) trigger as soon as the threshold level is reached.
Alarms for toxic gases can be set to trigger when a threshold is reached, normally the 8 hour occupational exposure limit (OEL), and/or when the 15 minute OEL (TWA) and 8 hour OEL (TWA) are exceeded.
Practical
The sealed lead acid battery pack provides enough capacity for twelve hours of continuous use. Charging is accomplished by locating the instrument into the charger or charger/interface unit
Light and Rugged

Triple Plus is moulded from Triax and its design ensures that it is extremely strong. Special sealing techniques are used to provide protection against water and dust ingress to IP65. Aspirators and internal pumps are options as is a baffle plate for use in muddy conditions; a leather carrying case with waist strap and alarm earphone are available. The instrument weighs only 9009.
Ease of Maintenance
We recommend monthly checking of the instrument with test gas. Six monthly calibration is easily carried out, using push buttons. Calibration due warning is provided after programming in the appropriate date.
An Autocalibrator is available, giving a full printout of all calibration parameters.
Computer Interface
By locating the instrument into its charger/interface, communication via an RS232 serial link to a computer terminal is simplicity itself. Using this facility, alarm levels and the clock can be adjusted, data logging can be accessed and the passcode can be changed. Crowcon's software has been designed to facilitate this and to enable data to be stored for spreadsheet use.
Data Logging
When set up for data logging, sample readings are taken during a shift and the recorded data can be downloaded into a printer or a computer, via the serial interface built into the charger/interface. Data reports incorporate the instrument serial number to simplify analysis.
specification - Triple Plus
Weight
900g (2lbs)

Dimensions
167 mm x 73mm x 118mm (6.6" x 2.9" x 4.65" )

Typical measuring range
0-100% LEL, 0-25% oxygen, 0-50 ppm hydrogen sulphide, 0500 ppm carbon monoxide.

Typical alarm levels
Typically 20% LEL, 19% and 23% oxygen, 10 ppm hydrogen sulphide, 50 ppm carbon monoxide, instantaneous alarm and/or TWA alarm (STEL and LTEL).

Response times T90
Methane 20 seconds, oxygen 10 seconds, typical toxic gas 20 seconds.

Visual alarm indicators
Flashing green LED every 3 seconds with confidence blip. Flashing red LED in alarm. Green LED flashing every second for low battery.

Audible alarms
Wailing piezo electric 85 dBA at 1 metre. Intermittent sound for battery requiring recharge.

Display
2 lines of 24 characters dot matrix high contrast LCD with back light operating for 30 min. Values and units shown (up to 4 gases simultaneously), current, TWA or peak. English, French, Spanish or other text.

Operating temperature range
-10°C to 50°C (14°F to 122°F)

Humidity
0-95% RH non condensing

Expected sensor life
Pellistor 5 years, toxic gas 2 years, oxygen 1 year.

Battery pack
Sealed lead acid 1.2Ah, interchangeable. Battery life 12 hours. Pumped version 7-8 hours.

Battery charging
Input 110 to 220/24OV AC, 12-40V DC Typical charge time 5-6 hours.

Safety Certificate No.
SSA 912016X/SCS Ex94Y2069X

Approval code
Europe
Ex ias IIC T4

USA & Canada
Class 1, Division 1, Groups A, B, C, D.

Standards
Europe
EN50014, EN50020, SFA3009.

USA & Canada
UL 913, CSA 22.2

RF Immunity
Tested to IEC801-3 and meets EN50082-2.

RF Radiation
Tested to EN55022 class B and meets EN50081-2.

GASMAN

Personal Gas Monitors

Everyone nowadays is aware of the potential problems when people have to work in areas where the atmosphere contains a toxic gas at concentrations around or above the 8 hour Occupational Exposure Limit (OEL)
Gasman range provides continuous, economical and reliable protection for the individual and there are versions for a wide range of gases.

The Gasman OX is a similar unit but provides warning if the oxygen level drops to a dangerous level or rises to a point where there is increased risk of fire.
If the risk is from possible leakage of flammable gases or vapours the Gasman FL meets the need.

Alarm and Measuring

All models in the range have a large front mounted digital display, incorporating a push button operated back light. A green LED flashes intermittently to confirm that the unit is functioning. When dangerous conditions occur a loud audible alarm operates and a red LED on top of the instrument flashes.

Intrinsically Safe

Personal gas detectors are, more often than not, used in potentially explosive atmospheres and the Gasman range is therefore intrinsically safe.

Lightweight Personal Monitoring

The sensor is mounted on the top of the instrument to ensure that it can detect gas quickly when placed in the top pocket. The case is injection moulded from Triax to ensure resistance to knocks, is dust and water resistant to 1P65 and is fitted with a clip. A carrying case with shoulder strap is standard, and an alarm earphone is an option.
Power is by four AA size batteries providing many hours of operation (up to 4 months for toxic gas and oxygen versions when used during a normal 40 hour working week). A rechargeable battery pack is optional. A continuous audible alarm operates when the battery is low and the green LED no longer flashes.

Specification - Gasman TO

Dimensions
11 5mm X 66mm X 39mm (4.5" x 2.6" x 1.5")

Weight
268g (0.59lbs) with batteries.

Accessories
Carrying case, aspirator/calibration adaptor.

Measurement range
0-50 ppm H2S
0-500 ppm CO
0- 10 ppm S02
0.5 ppm CL2
0-10 ppm N02
0 - 10 ppm HCI
0-25 ppm HCN
0-50 ppm NH3
0-1 ppm 03

Display
LCD (push switch operated backlight).
Alarm levels
Concentration limit for 8 hour OEL latching) (non-latching)

Alarm indication
Pulsating red LED and audible, 77c1BA at 1 m.

Battery
4 x AA cells, rechargeable pack optional (single and eight way chargers available).

Battery life Disposable
700 hours

Rechargeable
300 hours

Operating temperature range

-10°C to 50°C (14°F to 122°F)

Humidity
0-95% RH non-condensing

Safety Certificate No.
Ex93C2069X

Approval code
Europe
E Ex ia IIC T3/T4

USA & Canada
Class 1, Division 1, Groups A, B, C, D.

Standards
Europe
EN50014/EN50020

USA & Canada
UL913, CSA 22.2

Applications

Steel Works. Particularly for employees working around coke ovens, where CO is a potential problem.

Oil rigs and petrochemical plants. Most crude oil contains traces of H2S. This will leak to the atmosphere during any oil spillage, and is removed and vented during refining.

Marine. Personal monitoring is often required onboard ship, especially in engine rooms, or for storage and transfer of hazardous cargo.

General personnel protection in hazardous areas such as tunnels, construction sites and sewage plants.

DETECTIVE

Detective is a novel transportable gas detecting unit which enables a multi-gas monitoring system to be set up on any potentially hazardous site within minutes. If a small area needs monitoring while personnel are working, a single unit can be used to detect up to four different gases. To protect a larger area a number of Detectives can be linked together, providing a protective barrier around the work site.

Rugged, Sturdy and Effective
The main body of the unit is injection moulded and is protected against water and dust ingress to IP65. The unit is mounted on a galvanised and enamel finished tripod frame which maximises stability. The frame encircles the unit to add further protection, therefore making Detective ideal for the most hostile areas.

Detectives can be linked together via 10 metre leads. When one unit detects gas, it goes into alarm and activates an omnidirectional sounder and four red LED clusters on top, These flash two at a time in quick succession. Other units are activated via the linking leads and they too operate their lights and sounders. The Detective which has detected the gas is identified by its warning lights flashing at a faster rate and the red warning LED on its control panel being on.

Should the gas cloud move to another unit, the alarm indicator on that unit will activate and the LEDs on top will speed up to match other units that are detecting gas.

Multi-Functional, Simple Controls

Detective can monitor up to four gases simultaneously and it offers a peak reading hold facility and time weighted average alarms and readings. Data logging is built in as standard.

There are four push button controls on the front control panel for On/off operation, display backlight and calibration. When switching a unit on it goes through a self test routine and checks the battery level. In normal operation a green LED on the front flashes every three seconds to confirm normal working. The LCD display with manually operated backlight shows gas readings continuously. Detective is calibrated after entering a passcode, using the push buttons.

There is a low battery alarm to indicate when charging is required.

Alarms for flammable gases and oxygen trigger as soon as the threshold level is reached. Alarms for toxic gases con be set to trigger when a threshold is reached and/or when the 15 minute or 8 hour OEL (TWA) are exceeded.
Specification - Detective
Dimensions
660mm x 380mm x 380mm (26" x 15" x 15")

Weight
8.5kg (19lbs)

Typical measuring range
0-100% LEL, 0-25% oxygen, 0-50 ppm hydrogen sulphide, 0-500 ppm carbon monoxide.

Typical alarm levels
Typically 20% LEL, 19% and 23% oxygen, 10 ppm hydrogen sulphide, 50 ppm carbon monoxide, instantaneous alarm and/or TWA alarm (STEL and LTEL).

Visual alarms
4 large red LED clusters flashing 2 at a time in quick succession. Faster rate flashing and red LED on control panel if that particular unit is detecting gas. Flashing green LED every three seconds as confidence blip.
Audible alarms
101 dBA alarm when in alarm mode. Low battery audible alarm.

Display
2 lines of 24 characters dot matrix high contrast LCD with back light. Values and units shown (up to 4 gases simultaneously), current, TWA or peak.

Operating temperature range
- 10°C to 50°C (14°F to 122°F)

Humidity
0-95% RH non-condensing

Battery
6V 4.8Ah sealed lead acid battery pack.

Battery charger
11OV or 240V (please specify), recharge time 6-8 hours.

Inputs/Outputs
Battery charge mains socket. Sockets for linking Detectives together. Interface socket for connecting to a computer.

Safety Certificate No
EX94C2OOBX

Approval code
Europe
Ex ias IlC T4

USA & Canada
Class 1, Division 1, Groups A, B, C, D.

Standards

Europe
EN50014, EN50020, SFA3009

USA &Canada
UL 913, CSA 22.2

Practical
Detective's sensors are located underneath the body of the unit for protection.
The sealed lead acid battery pack provides enough capacity for 24 hours continuous monitoring and half an hour in alarm mode. The battery is charged from the mains supply via a socket on the back plate (11 OV or 24OV AC).
When Detectives are not in use they can be stacked for convenient storage.

Applications
General working. Hazardous areas particularly offshore, petrochemical and chemical sites. Where people are working on a temporary basis, Detective can be used singly or linked together to warn of flammable gas clouds.
Underground construction/sewer work. People working in confined spaces, tunnels, sewers etc. will require local warning of gas hazards as well as the facility to warn others above ground or further along the tunnel.
Shipping. The unloading of hazardous cargo is a useful application for Detective as it will warn against accidental spillage of flammable liquids.
Plant Shut-down. Using Detective provides necessary protection during maintenance and shut-down of plant.

AUTOCALIBRATOR II

As with any other type of instrumentation, portable gas detectors rely on routine calibration for effective operation. This can be time consuming for users with large numbers of portable gas detectors. To help solve this problem we offer the Autocalibrator II.
The Autocalibrator, which is suitable for use with Custodian, Triple Plus and Detective is used in conjunction with a PC and provides a fully automatic calibration routine with optional data logging. Housed in a compact bench mounting enclosure, the unit can be connected to up to five cylinders of calibration gas mixtures. An inlet for an air cylinder is also available but normal room air can be used where appropriate. The unit includes all the necessary internal pumps and solenoid valves, provision for a Custodian or Triple Plus adaptor, and an RS232 cable for connection to the serial port of the PC. The adaptors allow the Autocalibrator to interface to the instrument.
The operation of the unit is controlled by software, which runs in Windows TM. With the required gas cylinders and PC connected, a simple keystroke is all that is required to initiate the calibration routine.

Once initiated, the unit will display on the PC monitor the model and serial number of the detector being calibrated, followed by the gases that the monitor has been set up to detect, along with the relevant alarm levels. The unit will then automatically present each gas in turn to the detector and at the end of a preset period adjust the sensor output to the correct calibration.

When all the sensors have been calibrated, the unit purges the system with air and stores the calibration information in a file unique to that instrument. This provides an ongoing database of service and calibration history. The same information can also be printed as hard copy. Should a sensor fail calibration for any reason, the system will advise the user accordingly.

FIXED SYSTEMS
In addition to our range of portable detectors, supplies a comprehensive range of gas and fire detection and gas sampling systems.

Gasmaster

Designed to be inexpensive and simple to install and operate, Gasmaster can be used with any combination of flammable and toxic gas detectors.

The front panel features easy to read indications of power and gas concentration, and individual LEDs are provided for two levels of alarm and fault for each channel. Common relays are included for high alarm, low alarm and fault as well as individual relays for high and low alarm. In addition, other outputs are provided for up to two YL4 Yodalights and individual analogue outputs.

The slimline case is water and dust resistant to IP54 (NEMA 4) and an optional IP66 (NEMA 4X) external case is also available. A flameproof (Ex cl) version of Gasmaster is also offered.

Gasmonitor

Gasmonitor is a 19 " rack mounting control panel housing up to 16 input modules. Each gas detection module can be used with any of gas detector, and each twin zone fire module can be used with up to 20 fire detectors per zone.
The system is microprocessor controlled, giving the user total flexibility in configuration, alarm setup and relay operation. The design also incorporates features that allow the operator to perform one man calibration at the detector, automatic data logging, three levels of alarm as standard, voted outputs, and RS232 communications.

Ditech

Ditech is a modular fire and gas detection system intended primarily for major petrochemical and offshore projects. Designed in a 19" format the system comprises a number of input and output cards which can be configured to suit a particular application.

Gaslink

Gaslink is a 4-20 mA output gas detector using our entire range of flammable and toxic gas sensors. Toxic versions use a two wire field connection and operate as a current sink (loop powered). Zener barriers are required for hazardous area use. Flammable gas versions use a three wire field connection and a special Zener barrier is available to operate them from a 24V supply.
The detector utilises our own polyester Ex e junction box which is rated to IP66 (NEMA 4X). The transmitter includes an LCD display which in normal operation indicates gas concentration, and in conjunction with the two pushbuttons is also used for calibration and test. All Gaslink detectors are certified intrinsically safe when used with approved Zener barriers.

D15/6 & D19
D19 uses a poison resistant pellistor sensor to detect flammable gases. The design incorporates a high grade stainless steel body and sinter, and encapsulated internal assembly. For high temperature (up to 20OoC) and high concentration (0-100% volume) applications, special versions are available.
D15/6 is intended for more demanding applications, such as offshore, with two part body construction allowing the pellistor sensor to be easily changed.

Sampling Systems

We supply a range of gas sampling systems to suit special applications. Preconfigured systems are supplied for landfill sites and for monitoring engines powered by alternative fuels. In addition, air sampling and environmental sampling units are available which operate in conjunction with a standard detector. Custom built systems are designed and constructed to suit customers specific applications.