DO402G 4-Wire Dissolved Oxygen Analyzer
Model DO402G
4-Wire Dissolved Oxygen Analyzer
Product Information
Flexibility, reliability and low maintenance are among the benefits provided by the EXA DO402G dissolved oxygen analyzer. Designed to meet the exacting requirements of measuring dissolved oxygen in the modern industrial environment, it contains many features to ensure the best precision whatever the application.
The DO402G features PI control on both the auxilliary mA output and the pulse proportional relay outputs, thus avoiding the need for a separate controller.
The DO402G accepts inputs from both galvanic and polarographic sensors. Percent saturation, mg oxygen/l water, and ppm DO can be displayed and transmitted. Compensation for atmospheric pressure altitude, salinity and temperature are included for the best accuracy of measurement.
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Bulletin  for DO402G |
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General Specification for DO402G |
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General Specification for DO Sensor |
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User's Manual for DO402G |
Featuers
| * | Free measuring range of 0 to 50 mg/l. Minimum span of 1 mg/l that can be arbitrarily set. |
| * | Either mg/l, ppm, or % saturation can be selected as the unit for display. |
| * | Built-in barometric pressure and salinity compensation functions for high accuracy measurement. |
| * | Small-sized intelligent converter with a built-in wash timer function. |
| * | One-touch calibration using air or a solution saturated with air. |
| * | Provision of various self-diagnostic functions as in the DO sensor (Temperature measured value, membrane failure etc.). |
| * | Incorporation of abundant contact output functions. |
Specifications
| Input specifications | Input range varies from 0.0 nA up to 500 nA for polarographic sensors and 0.0 to 50 μA for galvanic sensors. Temperature measurement for automatic temperature compensation utilizes Pt100, Pt1000. 22k NTC or PB36 as used in DO8X and DO30 sensors |
| Input ranges | Dissolved Oxygen: 0 to 50 mg/l (ppm) Temperature: 0 to 50 deg C |
| Span | DO concentration: minimum: 1 mg/l (ppm), maximum: 50 mg/l (ppm) % saturation: minimum: 10 %, maximum: 300 % Temperature: minimum: 25 deg C, maximum: 50 deg C |
| Transmission signals | Two isolated outputs of 0 to 20/4 to20 mA DC with common negative. Maximum load 600 Ω. |
| Temperature compensation | 0 to 50 deg C |
| Calibration | Semi-automatic calibration with automatic compensation for influence of barometric pressure and altitude on partial pressure of Oxygen in air (or solubility of Oxygen in water). Automatic compensation for influence of salinity of water on solubility of Oxygen in water is programmable. The correction for pressure, salinity and temperature meets ISO 5814. |
| Contact outputs | General: Four (4) SPDT relay contacts with LED indicators. Switch capacity: Maximum values 100 VA, 250 V AC, 5 A Maximum values 50 W, 250 V DC, 5 A Status: High/low process alarms, selected from process parameter and temperature. Contact output is also available to signal "Hold active" |
| Serial communication | Bi-directional according to the EIA-485 standard using HART®-protocol |
| Contact input | Remote wash cycle start. |
| Power supply | 230 V AC ±15 %, 50/60 Hz, maximum consumption 10 VA 115 V AC ±15 %, 50/60 Hz, maximum consumption 10 VA 100 V AC ±15 %, 50/60 Hz, maximum consumption 10 VA |
Performance
DO at process temperature 25 deg C
| Linearity | ±0.03 mg or ±0.5 % FS, whichever is greater |
| Repeatability | ±0.03 mg or ±0.5 % FS, whichever is greater |
| Accuracy | ±0.05 mg or ±0.5 % FS, whichever is greater |
