Det-Tronics SW9200x Slickwatch IR Oil Detection System - Manual (Page 3)

SENSITIVITY—
Minimum film thickness detected is approximately 0.1
micrometer average thickness.
MOUNTING—
3/8-16 bolts (4 per housing) to user-supplied mounting
plate. The mounting plate interfaces between the instru-
ment housings and the user-supplied mounting frame-
work.
OPERATING VOLTAGE—
105 to 125 VAC, 50/60 Hz.
POWER CONSUMPTION—
Transmitter: 250 watts.
Receiver: 60 watts.
OPERATING TEMPERATURE—
In ambient air with instrument shaded from direct sun-
light: –4°F to +110°F (–20°C to +43°C) at 60 Hz opera-
tion; –4°F to +100°F (–20°C to +38°C) at 50 Hz opera-
tion.
OPERATING HEIGHT—
5 to 30 feet above the water surface, depending on
wave angle. (See graph in APPENDIX).
AREA MONITORED—
A circle with a diameter approximately 0.05 times the
height of the instrument above the water. Typically 28
square inches at a 10-foot operating height.
RESPONSE TIME—
Approximately 63% of final reading within 20 seconds
after a step change in water surface condition.
OIL ALARM—
SPST relay, rated at 7 amps continuous, 120 VAC or 28
VDC. Also rated at 1/3 HP at 120 VAC. Contacts are
closed under normal clean water conditions and open
when oil film is present.
INSTRUMENT STATUS ALARM—
SPST relay, rated at 7 amps continuous, 120 VAC or 28
VDC. Also rated at 1/3 HP at 120 VAC. Contacts are
closed under normal conditions and open when the
beam is interrupted or a malfunction occurs.
ANALOG OUTPUT—
A 0 to 10 VDC analog output is available from the instru-
ment. Under 2.0 VDC corresponds to clean water while
over 2.0 VDC corresponds to an oil film on the water sur-
face.
OPERATION IN HAZARDOUS ENVIRONMENTS—
Canadian Standards Association certified for operation
in Class I, Div. 1 Groups C & D, and CSA enclosures 3 &
4. Temperature code T2A for 250 watt transmitters.
FUNCTIONAL DESCRIPTION
A functional description of the operation of the SW9200
is detailed in the following paragraphs. See Figure 1.
2
Figure 1—Functional Block Diagram
SIGNAL
PROCESSING
ELECTRONICS
RATIOMETER
OPTIONAL
4 TO 20 MA
CONVERTER
THRESHOLD
DETECTOR
THRESHOLD
DETECTOR STATUS
ALARM
RELAY
ALARM
RELAY
OPTIONAL
ANALOG
OUTPUT
ANALOG
OUTPUT
INFRARED
PHOTO
DETECTOR
LAMP
RECEIVER
OPTICS
DENOM.
NUM.
RATIO
REFERENCE
FILTER
FILTER
WHEEL
TRANSMITTER OPTICS
ADJUST
MOTOR
ACTIVE
FILTER
A1605