Functional description – Det-Tronics SW9200x Slickwatch IR Oil Detection System User Manual

Page 3

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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

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