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Dissolved O2 Range
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The dissolved oxygen measurement range.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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Accuracy
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The dissolved oxygen accuracy of the instrument.
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Search Logic:
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All matching products will have a value less than or equal to the specified value.
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Dissolved Oxygen Sensor Technology
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Your choices are...
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Polarographic
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Polarographic sensor technology uses an external voltage. The difference in potential between the cathode and anode is less than 0.5 volts. This includes Ross and Clark polarographic types.
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Galvanic
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No external voltage is required. The difference in potential between the cathode and anode is greater than 0.5 volts. Galvanic probes are more stable and more accurate at low dissolved oxygen levels than polarographic probes. Galvanic probes often operate several months without electrolyte or membrane replacement, resulting in lower maintenance cost.
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Optical Fluorescence
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The optical fluorescence sensor does not use up oxygen during measurement, therefore it does not require stirring. The device is extremely suitable for long-term measuring periods in groundwater. It is not sensitive to contaminants, sulfurous compounds, or aging. The sensor has a special coating with fluorescent properties. When light is exposed to the coating it causes fluorescence. After the exposure of light, the coating continues to produce a short afterglow. The level of oxygen present in the water determines the duration of this fluorescence or afterglow.
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Other
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Other unlisted, specialized, or proprietary configuration.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Controller?
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The instrument has some controller functionality (set limits, regulator, P/PI/PID, etc.).
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Control Relays:
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Number of relays controlling functionality.
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Search Logic:
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All matching products will have a value greater than or equal to the specified value.
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Mounting / Environment
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Your choices are...
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Hand Held
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Designed are designed to be operated while held by hand.
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Portable
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Devices have handles, a case, or wheels for ease of movement. They are not necessarily handheld.
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Modular
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Devices are modular and can be interfaced with sensors or input ranges.
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Lab / Benchtop
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Devices are designed to sit atop a bench or desktop in a laboratory. These instruments not suitable for field use.
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In-Situ / Field
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Devices can be used in a field setting, out of the laboratory.
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Panel
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Devices attach to a panel.
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Other
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Other unlisted, specialized, or proprietary mounting environments.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Display Type
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Your choices are...
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Analog Meter
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Analog meter indicator (needle indicator).
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Digital Display
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Display output utilizes both letters and numbers in a digital form.
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Video Display
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CRT, LCD flat panel, or other multiline display.
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None
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The instrument has no display.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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User Controls
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Your choices are...
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Manual Controls
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The instrument has simple front panel or local controls such as knobs and/or potentiometers.
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Digital Front Panel
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Programmable through a digital front panel keypad.
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Computer Interface
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Programmable through a computer interface.
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None
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The instrument has no user controls.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Electrical Output
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The type of electrical signal that will be produced.
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Your choices are...
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Analog Voltage
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Any analog voltage output. Output voltage is a simple (usually linear) function of the measurement.
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Analog Current
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Often called a transmitter. A current is imposed on the output circuit proportional to the measurement. Feedback is used to provide the appropriate current regardless of line noise, impedance, etc. Useful when sending signals over long distances.
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Analog Frequency
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A format that uses continuous physical variables such as voltage amplitude or frequency variations to transmit information.
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Switch / Alarm Relay
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An "output" of a change in state of switches or alarms.
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Other
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Other unlisted output type.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Interface Options
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Your choices are...
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Serial
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A standard digital output protocol (serial) such as RS232, RS422, RS485, etc.
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Parallel
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A standard digital output protocol (parallel) such as IEEE 488, etc.
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Other
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Any digital output other than the standard serial or parallel signals. Simple TTL logic signals are an example.
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Search Logic:
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All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Battery Powered
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The instrument requires batteries for full operation, not just a battery backup.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Filters
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The instrument has special signal processing or filtering (Butterworth, Bessel, etc.).
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Event Triggered
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The instrument can be set to capture / log data when an event happens.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Built-in or Self-calibration
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The instrument has a built-in calibrator, which it can be use to test and readjust itself.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Extreme Environment
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The instrument can withstand harsh environments like extreme humidity, temperature, dust, etc.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Self-test / Diagnostics
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The instrument has self-test or diagnostics ability.
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Search Logic:
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"Required" and "Must Not Have" criteria limit returned
matches as specified. Products with optional attributes
will be returned for either choice.
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Operating Temperature
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The temperature range over which the device must operate.
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Search Logic:
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User may specify either, both, or neither of the limits in a "From - To" range; when both are specified, matching products will cover entire range. Products returned as matches will meet all specified criteria.
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