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Dissolved O2 Range:

Allow up to: overrange/margin
Use the overrange/margin to restrict your search to items whose full-scale range is close to your requirements.
(Overrange/margin requires both 'From' and 'To' values to work.)

Accuracy:

Dissolved Oxygen Sensor Technology:

Controller Functionality?

Control Relays:

Mounting / Environment:

Display Type:

User Controls:

Electrical Output:

Interface Options:

Battery Powered?

Filters?

Event Triggered?

Built-in or Self-calibration?

Extreme Environment?

Self-test / Diagnostics?

Operating Temperature:

Allow up to: overrange/margin
Use the overrange/margin to restrict your search to items whose full-scale range is close to your requirements.
(Overrange/margin requires both 'From' and 'To' values to work.)

Help with Dissolved Oxygen Meters specifications:

Dissolved Oxygen Measurement
   Dissolved O2 Range       The dissolved oxygen measurement range. 
   Search Logic:      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.
   Accuracy       The dissolved oxygen accuracy of the instrument. 
   Search Logic:      All matching products will have a value less than or equal to the specified value.
   Dissolved Oxygen Sensor Technology       
   Your choices are...         
   Polarographic       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. 
   Galvanic       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. 
   Optical Fluorescence       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. 
   Other       Other unlisted, specialized, or proprietary configuration. 
   Search Logic:      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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Instrument Specific Features / Options
   Controller Functionality       Devices provide some controller functionality, such as set limits and proportional (P) control, proportional integrative (PI) control, or proportional integrative derivative (PIC) control. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Control Relays:       The number of control relays. 
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
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Special Instrument Type
   Mounting / Environment       
   Your choices are...         
   Hand Held       Devices are designed to be operated while held by hand. 
   Portable       Devices have handles, a case, or wheels for ease of movement. They are not necessarily handheld. 
   Modular       Devices are modular and can be interfaced with sensors or input ranges. 
   Lab / Benchtop       Devices are designed to sit atop a bench or desktop in a laboratory. They are not suitable for field use. 
   In-Situ / Field       Devices are designed for in-situ or field use, outside of a laboratory setting. 
   Panel       Devices attach to a panel. 
   Other       Other unlisted, specialized, or proprietary mounting environments. 
   Search Logic:      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 Interface
   Display Type       
   Your choices are...         
   Analog Meter       Devices have an analog meter, typically with a needle 
   Digital Display       Devices have a digital display.  
   Video Display       Devices have a cathode ray tube (CRT), liquid-crystal display (LCD), flat panel display (FPD), or other multiline display. 
   None       Devices do not have a display. 
   Search Logic:      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.
   User Controls       
   Your choices are...         
   Manual Controls       Devices have simple, front panel or local controls such as knobs and/or potentiometers. 
   Digital Front Panel       Devices have a digital front panel that is programmed with a keypad. 
   Computer Interface       Devices are programmed with a computer interface. 
   None       Devices do not have user controls. 
   Search Logic:      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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Output Options
   Electrical Output       
   Your choices are...         
   Analog Voltage Output       The output is an analog voltage. This is a simple, usually linear, function of the measurement. 
   Analog Current Output       The output is an analog current that is imposed on the output circuit proportional to the measurement. Feedback provides the appropriate current, regardless of variables such as line noise and impedance. Analog current outputs or transmitters are often used to send signals over long distances. 
   Analog Frequency Output       The output is an analog frequency, a format which transmits information with continuous physical variables such as voltage amplitude or frequency variations. 
   Switch / Alarm Relay Output       The output is a change-in-state of a switch or alarm. 
   Other Output       Other unlisted output types. 
   Search Logic:      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.
   Interface Options       
   Your choices are...         
   Serial       A standard digital output protocol (serial) such as RS232, RS422, RS485, etc. 
   Parallel       A standard digital output protocol (parallel) such as IEEE 488, etc. 
   Other       Any digital output other than the standard serial or parallel signals. Simple TTL logic signals are an example. 
   Search Logic:      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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Features & Functionality
   Battery Powered       Devices require batteries for full operation, not just a battery backup. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Filters       Devices provide special signal processing or filtering. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Event Triggered       Devices can capture and/or log data when an event happens. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Built-in or Self-calibration       Devices have a built-in calibrator, which can be used for testing and readjustment. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Extreme Environment       Devices are designed to withstand harsh environments with extreme humidity, temperature, dust, etc. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   Self-test / Diagnostics       Devices have self-test or diagnostics capabilities. 
   Search Logic:      "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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Environment
   Operating Temperature       The temperature range over which devices are designed to operate. 
   Search Logic:      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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