16
OFDMANUAL 0816
F I E L D C A L I B R AT I O N
The OFD is factory calibrated such that 4 ppm of fluorescent dye is equal to 20 mA and should not require
calibration. However, if operators change dye levels, some fine-tuning may be necessary.
INCREASE SENSITIVITY WHEN dye levels are below 4 ppm or when readings from dyed product are
typically falling in the lower or middle portion of the KAM
®
OFD™ output range.
DECREASE SENSITIVITY WHEN dyed products levels are above 4 ppm or when readings exceed the
maximum reading of the pre-calibrated settings. Products that exceed the pre-set calibration readings will
produce an off-scale reading exceeding 20 mA. Decreasing sensitivity lowers the output
range of the KAM
®
OFD™ sensor to allow all readings to fall within the 4-20 mA output ranges.
Caution: When multiple KAM
®
OFD™ sensors are being used on the same system, each sensor should be
calibrated equally wherein fluids with 4 ppm of fluorescent dye are calibrated to 20 mA on the OFD.
The calibration procedure consists of increasing the gain or reducing the gain as needed to increase
or reduce sensitivity.
LED light output settings are pre-set at the factory and should not be adjusted.
REQUIRED TOOLS: VOLT METER, SMALL FLAT-HEAD SCREWDRIVER
CHANGING THE HIGH END OF OUTPUT RANGE IN LINE
Determine when fluorescent dyed product will be at sensor,.
Connect a volt meter across 4-20 mA terminals. With fluorescent dyed product flowing, increase the gain by
turning GAIN (FIG. 4-1) counterclockwise or decrease by turning clockwise. As you are turning, look at your
volt meter and stop when it reads 20 mA or 100% of scale.
FOR ALL OTHER TYPES OF ADJUSTMENTS CALL KAM CONTROLS, INC. +1 713 784 0000.
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Place the sensor tip of the OFD in a sample container with a dyed fuel sample containing the maximum
amount of dye in which the OFD will operate (usually 4 ppm). The sample should be in a container that is at
least 8” deep, and the tip of the sensor should be positioned at least 6” away from the bottom. The container
should should be sealed from any external light.
Turn the OFD power on and wait for 5 minutes.
Connect a volt meter across 4-20 mA terminals. Increase the gain by turning GAIN (FIG. 4-1) counterclock-
wise or decrease by turning clockwise. As you are turning, look at your volt meter and stop when it reads 20
mA or 100% of scale.
CHANGING THE HIGH END OF OUTPUT RANGE OFF LINE
The low end of the range is set for non-dyed products or 0 ppm. Readings may vary somewhat but should not
exceed 5 mA.
