Bristol Babcock Oil In Water
Alarms
|
The
OPM 1 oil content alarm was specifically designed for the
control of 15 ppm marine bilge oil separators and
fully conforms to the requirements of IMO Resolution A393(X),
and MEPC 60/33.
The design results from extensive experience in the development
of oil content meters and makes use of advanced techniques
and components. The actual concentration is displayed on a
multi element LED bargraph display and facilities are provided
for a remote recorder and alarm indication.
|
Operating
Technique & Facilities
|
The
sample flows through a cylindrical glass cell through which
a low intensity beam of infrared radiation is projected.
Two silicon photodetectors are provided to detect and scattered
path of radiation by the oil particles. The angles and
field 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. This,
coupled with the wavelength of light chosen, ensures minimal
sensitivity to water colour and other soluble components,
and is inherently self compensating for window fouling, mains
voltage variation, and changes in ambient or sample temperatures.
|
|
Indication
and Alarm
|
Indication
of oil concentration is provided by the 10 element bargraph
display which provides accurate indication for a range of 20
ppm. Two alarm relays are provided, both factory set to
operate at 15ppm. One is arranged to operate immediately
the 15 ppm level is exceeded, while the other is provided with
a delayed reaction. The operating state of each relay
is indicated by solid state indicators on the door of the instrument.
Additional and similar indication is also provided for Mains
On and Equipment Fault.
|
|
Installation
And Maintenance
|
This
unit should be installed as close as practicable to the sampling
point. Access is only required to the top of the cell
housing, and front of the instrument. The connection
requirements should closely follow the installation diagram.
Little maintenance is required and is confined to a periodic
check of zero against clean water and occasional cleaning of
the glass sample cell, which is mounted in a cell box fixed
to the side of the main instrument case. Access to the
inside of the cell is provided by a hand-tightened screw cap,
which enables insertion of a tube cleaning brush. No dismantling
is involved.
|
|
Specifications
|
Range
|
0
-20 ppm
|
Accuracy
|
Within
IMO limits
|
Indication
|
10
element LED bargraph display
|
Enclosure
Rating
|
IP
55
|
Size
|
400mm
high x 380mm wide x 150mm deep
|
Weight
|
11
kg
|
Output
Signal
|
0
- 2 V DC linear for 0 - 20 ppm (minimum load 1 k)
|
Ambient
Temperature
|
-
15º C to +60º C
|
Clean
Water Requirement
|
2
bar to 8 bar
|
Electrical
Supply
|
220V
AC ± 10%, 50/60 Hz ± 10%
110V AC ± 10%, 50/60 Hz ± 10%
|
Power
Consumption
|
20
VA
|
Relays
|
2
off instantaneous and delayed (factory delay set @ 20 sec)
|
Contacts
|
Single
pole c/o Rating: 2.5A at 250 V AC
|
Alarm
/Fault Indication
|
3
off Instant / Delay / Fault Red LED's on front panel
|
Sample
Pressure
|
2
bar to 8 bar
|
Sample
Flow
|
1.0
litres/ min
|
Sample
Temperature
|
+2º
C to + 40º C
|
Sample
Connections
|
Compression
fitting for 10mm outside diameter pipe
|
|
|
|