HYDROSENSE HS2410
Revision 5.0
P a g e 9 | 27
If an interfering background chemical changes in concentration, the HydroSense will sense this change.
Consideration to this affect is important for alarms and recording. Filtering of the water, changes to
chemical use, or special light filtering may be required to provide more stable readings.
The periodic introduction of fluorescing chemicals into the water may also affect the reading. During
these conditions, operators should be acknowledged that nuisance alarms may occur. Soap
manufacturers will often include fluorescing dyes in the product for appearance and identification.
Green dyes are typical in industrial degreasers and commercial soaps. Fluorescing chemicals are often
included in detergents to enhance the visual affect of a cleaned product such as clothes.
Not all of these commercial dyes will affect the wavelengths of the HydroSense, however, green dyes
have proven to be a common interference.
Suspended Solids and Turbidity
The unit is calibrated to a passing stream of water. The amount of light fluoresced by the aromatic
hydrocarbons determines the calibration parameters. The light received by a hydrocarbon and then
sent to the receiver is based on a stable light path through the water. If suspended solids or turbidity
block the light getting to the hydrocarbon, light cannot be fluoresced back to the sensor. Readings can
be dampened by an increase in solids or turbidity. When process water is used during the calibration,
the offset affect of solids is taken into account and zeroed out.
The design of the large surface sensing area verses the small sensing depth minimizes the affect of
turbidity in the HydroSense. In effect, the hydrocarbons have little place to hide behind solids. In
circumstances of dramatic changes in turbidity, sample-conditioning techniques prior to the
HydroSense should be considered.
Temperature Compensation
Temperature can affect the light sensor. Temperature compensation is built into the unit. The
temperature compensation coefficient will be preset at the factory.
2.4 ROUTINE
CLEANING
PROGRAM
The HydroSense relies on a constant flow of water across the sensing plate. Excessive particulates and
algae in the water can build up on the flow plate and in the overflow tray. This will eventually affect the
performance of the unit.
Setting up a Routine Cleaning Program is vital to the successful performance of the unit.
Each application will vary in the frequency of cleaning. Some may require daily wipes and some may
require monthly cleaning. A basic wipe down of the flow plate can be done without having to shutdown
the stream or power. The wipe procedure will take 2 to 3 minutes.
To set up a schedule, it is recommended to program a daily wipe of the flow plate using a clean paper
towel. After two weeks of daily cleaning, determine if every other day may be adequate. If so, set this
program in place for two weeks. Slowly extend the frequency between cleanings until an adequate
program frequency is determined for your individual site conditions.
Cleaning the flow plate and plastic surface should be done with clear non-fluorescing chemicals. An
appropriate flow plate cleaner is Windex brand “anti-fog”. Low concentrate Muriatic acid (18%) or
Isopropyl Alcohol are also effective. Use only chemicals approved for your site, personal safety and
disposal. Be sure to thoroughly rinse the flow plate with clean water before installing.
CAUTION
Repeated visual contact with the light source can be harmful. Avoid
looking directly at the ultraviolet light source. Wear UV protection.
Содержание HYDROSENSE 2410
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