Det-Tronics SW9200x Slickwatch IR Oil Detection System - Manual (Page 7)

Setpoint
The OIL ALARM Set Point test jack is used to access the
oil alarm threshold setting. This test jack is not used with
the Film Thickness Discriminator option.
OUTPUT
The OUTPUT test jacks permit access to the NUMERA-
TOR, DENOMINATOR AND RATIO outputs:
RATIO (brown)
RATIO (processed ratio of the two reflected IR beams):
0 to 10 V.
DENOM (red)
DENOMINATOR (intensity of one of two reflected IR
beams): 0 to 1 V.
NUM (blue)
NUMERATOR (intensity of the second of two reflected IR
beams): 0 to 1 V.
SIG. GND. (green)
The SIG. GND. test jacks permits access to signal
ground.
OUT. OPT.
The OUT. OPT. test jack permits access to the optional
RATIO output and is used only if an Options p.c. board
(e.g. Film Thickness Discriminator) is installed.
FUSE
Two power line fuses have been located on the front
panel for accessibility. For standard 115 V power, only
the hot line is fused. The other fuse is a spare.
OUTPUT SELECT
This switch is used to select the type of RATIO output
that is available at the junction box:
O – Optional output mode
This position is available for optional processing data
output (e.g. Film Thickness Discriminator) if the optional
board is installed.
V – Voltage output mode
This position brings the RATIO output in 0-10 VDC to ter-
minal 1 of the junction box.
mA – Milliamp output mode
This position brings the RATIO output in 4-10 ma to ter-
minal 1 of the junction box, if this option was installed.
INSTALLATION
INSPECTION
Since the instrument may be subjected to shock or
vibration during shipping, an inspection of the connec-
tions and filterwheel is recommended.
Prior to the initial setup of the instrument, open the hous-
ing (see Access to Internal Components procedure) and
check that the printed circuit board(s) are securely held
in the connector(s). If a board has become dislodged,
return it to the proper connector. The Synchronous
Demodulator Board is on the left of the filterwheel and
the Options Board is on the right (Figure 3).
Observe the location of the keys and do not attempt to
insert the printed circuit board(s) backwards. Be certain
that the board is firmly seated in the connector and that
both the top and bottom are held by the card guides.
Check that the ribbon connectors on the AGC/TE Cooler
Board and on the Rear Panel Board are fully engaged
and that the latches are locked. Rotate the filterwheel to
check that it spins freely. Check that the two receiver
connectors are securely engaged.
SITE REQUIREMENTS
The SW9200 is normally mounted from five to 30 feet
above the water surface to be monitored. It views a
small area of the water surface directly below the instru-
ment. The maximum operating height is determined by
the turbulence of the water surface below the instrument.
A graph in the APPENDIX shows the maximum operating
height as a function of water turbulence, where turbu-
lence is characterized by the maximum angle of the
waves.
The instrument’s viewing path down to the water must be
unobstructed. It should be placed where oil spilled on
the water is likely to be carried past the receiver’s field of
view by spreading, prevailing winds, currents, waves or
deflecting booms. An ideal site is just at a dam spillway,
where turbulence is relatively low and constant. External
hazards to the instrument, such as boat docking activity
and possible vandalism, must be taken into account
when choosing a location for instrument mounting. The
instrument’s field of view should be as far as possible (at
least 12 inches) from obstructions in the water such as
pilings, walls, ladders, etc., as such obstructions tend to
repel an oil film by breaking up the film’s surface tension.
If the instrument is installed in a high temperature, high
humidity, or corrosive atmosphere, instrument air or dry
nitrogen purge is recommended.
Do not install the instrument so that the receiver directly
faces an intense heat source.
6