Description
The Graviner Mk6 OMD is an analogue addressable oil mist detection system, capable of monitoring up to 64 detector heads fitted on up to 8 engines. This is achieved without sample pipes and with minimum cabling. Each detector head monitors a single crankspace and is a stand-alone device. When assigned a unique address and supplied with 24V DC it gathers oil mist density data and converts it to a digital signal for transmission via the data cable to the control unit.
Specifications
| Construction | |
| Detector | Black Zytel 70G30 Nylon 66 |
| Junction Box | Cast Aluminium Control |
| Unit | Painted mild steel enclosure |
| Response time | Less than 1.2 seconds for a 64 detector system |
| Sensitivity | Detects average crankspace oil mist densities between 0.3mg/l and 1.3mg/l. Easily adjustable by customer to suit individual engine (lower explosion limit 30 – 50mg/l depending upon oil type). Detects variation of individual crankspace densities from the average of between 0.05mg/l and 0.5mg/l (simple adjustment by customer). |
| Operating Temperature | Detector and Junction Box: 0 – 70°C (ambient and sample temperature) Control Unit: 0 – 55°C ambient |
| Strorage temperature | -20°C to +60°C |
| System Protection | Detector and Junction Box: Designed to meet IP65. Salt fog immune. Control Unit: Designed to meet IP32. |
| Operating Voltage | 24V DC (+30% -25%) |
| Power Consumption | Detector: 116mA Control Unit: 215mA |
| Protection | By self re-settable fuse inside Control Unit; Junction Box 4.0 amp fuse |
| Insulation | Flash tested to 2000V for 1 minute |
| Immunity to noise | System tested to requirements of classification societies including:
– Radiated susceptibility to radiated noise – Conducted susceptibility to electrical noise – Short duration supply interruption – 1kV high frequency transient voltages |
| System Outputs | – Fault alarm: 1 set volt-free change-over relay contacts. Relay normally energised when system is powered. De-energises for fault or test condition.
– Main alarm: 1 set volt-free change-over relay contacts. Relay normally energised when system is powered. De-energises for alarm or test condition. – Engine shutdown: 8 sets of volt-free change-over relay contacts. Relays normally de-energised when system is powered. Energises for alarm or test condition. |
| Back-up Alarm | 1 set per engine mounted junction box. |
| Alarm Ranges | Average: 0.3mg/l to 1.3mg/l
Deviation: 0.05mg/l to 0.5mg/l Back-up: 1.6mg/l fixed |
| Output relay contacts | 30V 1A DC |
| System dimensions
(L x W x H) |
Detector: 95 x 205 x 175
Junction Box: 318 x 186 x 90 (mm) Control Unit: 500 x 313 x 118 (Bulkhead mounting) 619 x 369 x 118 (Panel mounting) |
| System weights (kg) | Detector: 0.6
Junction Box: 2.7 Control Unit: 6.6 |
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