ARJAY ENGINEERING HYDROSENSE 2410, Руководство пользователя

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HYDROSENSE HS2410 Revision 5.0 P a g e 7 | 27
2.0 INSTRUMENT OVERVIEW
2.1 FEATURES
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Fluorescence technology
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Non-contact sensor
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Isolated inputs
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Continuous On-Line monitoring
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Instantaneous readings
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Multi-point automatic or manual calibration
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Temperature and light degradation compensation
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4 relays (SPDT 10A contacts) (R1 and R2 for PPM alarms, R3 and R4 for maintenance alarm)
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Isolated 4-20 mA output, RS-485 Modbus output, optional HART and Fieldbus Foundation
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LCD display in PPM
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No moving parts, complete maintenance without turning off the sample stream
2.2 DESCRIPTION
The HydroSense Oil in Water Monitor from Arjay Engineering Ltd. has been designed for municipal and
industrial applications to measure PPM levels of petroleum hydrocarbons in aqueous solutions. Typical
applications include PPM trace amounts of oil in effluent water from storm water runoff, oil in cooling
water, produced water, and oil/water separators. Other measurements and mediums can be monitored
on request (i.e. colorants in fluids, etc.).
A continuous sample is directed into the sample chamber using a pumped or process pressure source.
A stable flow rate is required. The sample is released from the sample chamber by a gravity flow to a
drain or sump.
The sample flow is dispersed evenly down an 88 mm x 200 mm flow plate. This dispersion
accomplishes two favorable results. Firstly, the sample is spread over a wide area, providing a large
surface area for the ultraviolet light to penetrate. This results in an increased excitation of the oil
molecules. Secondly, the gravity flow against the flow plate minimizes the sample depth against the
flow plate. This reduces the effect of suspended solids interference. Fewer oil molecules can ‘hide’ from
the light source.
After the sample leaves the flow plate, it is allowed to gravity flow to the outlet port. The sample outfall
must not be obstructed from gravity flow. For purge application a U-Trap would be required.
The ultraviolet light source is positioned directly in front of the sample flow. The receiver is positioned at
an angle to the flow direction. Both the emitter and the receiver are equipped with precision light filters
to control the wavelengths of the ultraviolet light being emitted and the fluoresced light being received.
A relationship between the measured fluoresced light and the amount of oil in the sample is
mathematically predictable over the measurement range of the instrument. The precision light filters
maximize the predictability over alternative non-filtered methods of measurement.
The sample tray is easily accessed for any necessary cleaning of the flow plate. The ultraviolet light
source is easily accessible for replacement as required.
For periodic testing and calibration, a 3-way valve in the inlet line is provided to manually input a fresh
water source to confirm the instrument response, zero and clean the instrument.