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7/30/2019 Nimbus in Detail
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Nimbus - in detail
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How does Nimbus work?
Dual wavelength beam
- 3.3 and 3.05 microns
Detectors 1 & 2
light
Lamp windows cell gas sample chamber reflectors
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Nimbus vrs. Cirrus
Lighter and less expensive
- Marine grade alloy - LM25, referred to as Copper free
Aluminum in the US
- Advanced electronic design uses single rigid PCB and
achieves even higher MTBF of 10 years Simplified optical design
- Custom IR detector block - reduces cost at the expense
of flexibility
Integrated Gas Cell- For simple gas checks
Dual 4-20 mA output
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Nimbus PCB assembly
IR SourceIR Detectors
Main connections
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Installation
Cable- 3-way 1mm2 to 2.5mm2.
- 4-way can be used for dual mA output
Supply
- 10V- 32V @ 180mA (constant current)
Power
- 2-6W, extra power is dissipated as additional heat into
the optics
Mounting
- Set orientation if mounted externally, or hosing may
occur
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Orientation
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Operation
Start-up
- Nimbus takes less than 10 seconds to start detecting
gas from power-up. Single green flash indicates normal
operation.
Rapid response to gas- Nimbus has a T90 of less than 7 seconds and will
respond to gas in less than 3
Status LED
- The operating state and a wide range of faults can bedetermined using the LED
- Green - Ok, Red - Gas, Orange - Fault
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Modbus communications
Exd Comms connector fitted as standard
- Connects to PC or I.S. communicator, e.g. MTL611B
- Software for PC and MTL available now
- WindowsCE platforms will be supported
Read gas level, obscuration and faults
Set mA output levels
- Force mA output during commissioning
Perform zero and calibration
- Automated Wizards lead the user through these
processes
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Wizards
Available with PC & MTL software
Guides the user
- The user is lead through the zero and calibration
process with a series of screens
- Inhibit functions are automatically applied allowing one-man-operation without panel inhibits
User selectable calibration gas concentration
- The software ensures an appropriate range is used
User & date stored
- After a successful zero or calibration, the user name
and date are stored in Nimbus
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Supplied as Standard
Weather proof cover
- Static dissipative plastic to meet the new ATEXT
requirements
Single M20 or 1/2NPT Cable entry- 1 as standard, 2 can be requested at extra cost.
Communications port
- A flameproof optical communications portfor connection
to the I.S. cable. This is either M20 or 1/2 NPT tomatch the cable entry.
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Accessories
Flow cover
- For calibration or gas testing
I.S. Cable + PC software
MTL611B
- Intrinsically safe hand held communicator
Data pack for MTL611B
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Approvals
Full UL flameproof approval
- Nimbus meets UL1203 Class 1, Div 1, Groups B,C,D
- Cirrus meets UL2279 Class 1, Zones 1 & 2
Full CENELEC flameproof approval- EEx d IIB + Hydrogen T6
Full EMC approvals
- EN50081-2, EN50082-2 and prEN50270
IP and NEMA approvals
- IP66 (hosing) & IP67 (temporary submersion)
- NEMA 4X (US) - Includes Ice formation & salt spray
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Future Developments
Gas cell calibration
WindowsCE support for rugged palm-tops and
alternative I.S. devices
Duct mounting kit
Addressable systems support (dual port)