Babcock Oil In Water Alarm
- OPM 2
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The
OPM 2 Oil Content Alarm has been specifically designed for
the monitoring of effluent in hazardous  areas.
At present there is no formal international specification
for 'industrial' effluent monitors. For offshore application
the OPM 2 is fully compliant with IMO specification A393X
and MEPC60(33).
The design of the OPM2 Oil in Water
Monitor is the result of more than 25 years experience
in the development of
oil
content monitors, making use of advanced techniques and very
high specification components. The very low level
of concentration in parts per million of oil in water
is displayed
on a back lit LCD digital indicator. Facilities are
provided for remote indication, recording, and alarm status.
|
| Principle
of Measurement |
| Features |
| Compact |
| Continuous
Operation |
| Simple
Installation |
| Low
Maintenance Cost |
| No
Warm Up Period |
| Factory
Calibration |
| Construction |
|
The OPM2 (Option
1) is housed in a die-cast aluminum case providing protection
to IP65 requirements, and is certified for use in Zone 1 and
Zone 2 areas. The measuring cell is housed in a die-cast
aluminum case providing Explosion Proof Protection.
A further option is the OPM2 (Option 2) which allows the
control unit to be mounted in a safe area. The OPM2
(Option 2) which allows the control unit to be mounted in
a safe area. The OPM2 (Option 2) control unit is housed
in a deep drawn steel case providing protection to IP55.
The monitor and cell can be mounted independently of each
other. Interconnection is by intrinsically certified
cable.
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| Operating
Technique |
|
The side stream sample
flows through the cylindrical glass cell, through which a
low intensity beam of infrared radiation is projected.
Two silicon photodetectors are provided to detect the direct
path of radiation, and radiation scattered by oil particles.
The angles and fields of view of the detectors have been carefully
selected to provide high sensitivity to oil and very low sensitivity
to solids which may be present in the sample stream.
This, coupled with the wavelength of light chosen, ensures
minimal sensitivity to water color, and other soluble components,
and is inherently self compensating for window fouling, mains
voltage variation, and changes in ambient or sample temperatures.
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| Calibration |
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The unit construction
allows factory calibration, and interchange of detector assemblies
and electronic units can then be carried out on site without
further calibration being required. The design utilises
all solid state components.
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| Installation |
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Installation of the
unit must in accordance with codes of practice for the country
of installation. In the United Kingdom the flameproof
code of practice is BS5345 parts 1 and 3. Bristol Babcock
Ltd recommended that in absence of a local code the United
Kingdom code of practice be used.
The OPM2 should be installed as close as practical to the
sampling point. Access is only required to the front
and top of the instrument, and the connection requirements
should closely follow the installation diagram.
|
| Maintenance |
| Little maintenance is
required and is confined to a periodic check of zero against
clean water, and occasional cleaning of the glass sample cell.
Access to the cell is provided via a screw cap, permitting insertion
of a tube cleaning brush. |
| Quality
Assurance |
| Bristol Babcock Ltd is
approved to BS En9001 (BS5750 Pt 1) In addition, the factory
in which this unit is manufactured holds BASEEFA licence MO102.
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| Area
Classification |
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| Cell Assembly |
EEx
ia IIC T.4 |
| Control Unit |
OPM2(1)
EExd ia IIB T.6 |
| Control Unit (Option) |
OPM2(2)
Safe Area |
| Specification |
| Range |
0
- 20 ppm |
| Accuracy |
±2
ppm |
| Alarm Relay
1 |
Instant
Alarm: Factory Set To 15ppm |
| Alarm Relay
2 |
Delayed
Alarm at instant alarm level: Delay time variable 5 to 55 s
(factory set at 20 s) |
| Alarm Contacts |
Single
Pole c/o Rating 2.5A @ 240V 5.0A @ 110V |
| Alarm Indication |
Instant:
Red LED Delayed: Red LED |
| Fault Alarm |
Monitor
fault sets alarm condition |
| Fault Indication |
Red
LED |
| Concentration
Readout |
Back
Lit LCD display |
| Output Signal |
4
- 20 mA |
| Electrical
Supply: Standard |
240V ac ± 10% single
|
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50-60
Hz ± 10% |
| Electrical
Supply: Optional |
110V
ac ± 10% single phase |
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50-60Hz
± 10% |
| Power Consumption |
11
VA |
| Sample Pressure |
2
bar to 8 bar |
| Sample Flow |
1.0
litres/min |
| Sample Temp |
+2C
to +50C |
| Sample Connections |
Compression
fitting for 10mm outside diameter pipe |
| Ambient
Temp |
-15C
to +50C |
| Clean Water
Requirement |
Pressure
2 bar to 8 bar for cleaning and zero check |
| Size |
| Cell: 260mm
H x 120mm W x 80mm D |
| Control
Unit: OPM2(1) 445mm H x 345mm W x 210mm D |
| Control
Unit; OPM2(2) 400mm H x 380mm W x 150mm D |
| Weight
|
| Cell: 1Kg |
| Control
Unit: OPM2(1) 30Kg |
| Control
Unit: OPM2(2) 11Kg |
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