Light Source; Excitation Filter; Sample Cell; Emission Filter - Turner Designs TD-107 5.0 Operation Manual

5.0
TD-107 Oil Content Monitor
Operation Manual
translated to a voltage response which
corresponds to the concentration of
fluorescent hydrocarbons in the sample.
5.0
The TD-107 OCM contains five important
components that it uses to make the
fluorescence measurement:

1. Light Source

2. Excitation Filter

3. Sample Cell

4. Emission Filter

5. Light Detector

2.1 Light Source
5.0
The TD-107 OCM light source emits
photons over a specific wavelength range.
The light source wavelength range has
been selected to maximize the response of
the targeted oil and meet the DNV TAP NO.
771.61 mandated detection range while
minimizing the impact of chemical
interferences and sample turbidity. The light
source also has an internal power output
monitor to determine light output
independent of the fluorescence
measurement.
2.2 Excitation Filter
The excitation filter narrows the range of
wavelengths emitted by the light source.
The excitation filter is also selected to
maximize the response of the targeted oil
and meet the DNV TAP NO. 771.61
mandated detection range while minimizing
the impact of chemical interferences and
sample turbidity.
2.3 Sample Cell
The sample cell is the portion of the sample
block where the water sample is exposed to
the light transmitted by the excitation filter.
2.4 Emission Filter
The light emitted by the sample passes
through an emission filter, which narrows
the range of wavelengths once again. This
ensures only the desired wavelengths—
those emitted by the targeted oil— are
transmitted to the light detector. The
emission filter is selected to maximize
transmission of light emitted by the targeted
oil while meeting DNV TAP NO. 771.61
performance criteria.
2.5 Light Detector
The light detector produces a pulse of
electricity when it detects a photon that has
passed through the emission filter. The TD-
5.0
107 OCM counts these pulses and relates
that value to the stored calibration value to
determine the oil content of the water
passing through the sample cell.

2.6 Control Functions

5.0
The TD-107 is a microprocessor-based
instrument designed to measure the oil
content in the sample, display the current oil
content, and report the value to the
Datalogger. The digital display shows the oil
content (0.000–999 ppm), any internal
alarm notification, process water temp and
the cell condition %. Additional information
is displayed or changed by pressing various
keys on the instrument keypad. Additional
diagnostic information is also recorded in
the Datalogger. The TD-107
provides the following control functions:
1. Activates the High (5 ppm) Signal Alarm
upon the concentration reaching 5.0
ppm.
2. Activates the Early Warning upon the
concentration reaching 3.0 ppm (the
default value) or any user defined set
point between 1.0 and 3.0.
3. Activates the Zero Signal Alarm when
the concentration is measured at
approximately 0.0 ppm.
4. Activates a System Alarm when there is
an OCM failure. Also activates a High
Signal Alarm and Cell Alarm.
5. Activates High Signal Alarm, Early
Warning, Zero Signal Alarm, and
System Alarm Relays when the TD-
1075.0 OCM is put into the
MAINTENANCE MODE.
6. Activates the Cell Condition Alarm when
below the minimum voltage limit for light
transmitted through the sample cell. In
addition to the Cell Condition Alarm, a
High Alarm and a System alarm will also
be activated in this case.
6
5.0
OCM