Greenspan ORP300 ORP Logger
The Greenspan Analytical ORP Sensors are versatile instruments offering superior features to provide un-paralleled reliability while tolerating rough treatment in the tough environments where they are deployed. Oxidation and reduction (redox) reactions govern the behaviour of many chemical constituents in drinking water, process and waste waters as well as most aquatic environments. Reactions involving ions are both pH and Eh(mV) dependent, therefore chemical reactions in aqueous media can often be characterised by pH and Eh acting together with the activity of dissolved chemicals. The output from the ORP100 sensor is standard 4 – 20mA current loop. The higher the redox reading, the greater the level of corrosion that can occur with non protected metals.
Oxidation Reduction Potential Logger ORP300
A standard commercial Platinum ORP sensor is utilised by the ORP100 to measure ionic absorption in solution.
The principle means of detection is by measuring the difference in potential between an inert indicator electrode and a reference electrode. At redox equilibrium, the potential difference between the ideal indicator electrode and the reference electrode equals the redox potential of the system.
Electrodes made of platinum are most commonly used for Eh measurements. The standard hydrogen reference electrode is fragile and impractical for routine field use. The Greenspan ORP100 uses a silver:silver-chloride electrode and these are commonly used.
Applications:
• Borehole and pipeline monitoring
• Effluent monitoring
• River and stream measurements
Specification
Range +/- 500mV
Temperature Range 0-40C
Accuracy +/- 10mV (or +/- 0.2mA)
Supply Voltage 8-15VDC Reverse polarity protected-Surge protected to 2kV
Quiescent Current 12 mA
Warm up time to stable reading 2 Seconds
Output Load (min-max) 0-500 ohms at 14V
0-400 ohms at 12V
Output 4-20mA
Dimensions length 206 mm,
S/S body 31.8 mm OD
Delrin body 38 mm OD
Wetted Materials 316 Stainless steel, Delrin,
Ordering Information
ORP Ranges
Range: +/- 500mV, +/- 1,000mV
700-1012 ORP300 RS232 Includes additional electronics for large capacity data storage, advanced calibration and linearisation program, computer compatible outputs for direct connection between sensor and PC, time and event triggering. Full 16-bit processor with capacityfor additional memory expansion.
If choosing moulded cable, a standard HS7 is fitted to this sensor.
Ancillary Equipment
SDI-200 SDI-12 Converter Box - provides SDI-12 output from a RS232 sensor
Options for ORP Sensors
FOR ALL ORP SENSORS Optional WP7 Connector (Note a Detachable WP7 Cable will be required as well)
FOR ORP300 ONLY Optional Battery Pack with WP7 (Note a Detachable WP7 Cable will be required as well)
FOR ORP300 ONLY Optional Battery Pack with internal Communications connector
FOR ORP300 ONLY Optional Battery Pack with cable
5BPK-102 Battery Pack Cell Replacement Kit
FOR ORP300 ONLY CX18 Connector - required for use with sampler trigger and rain gauge input
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