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YOKOGAWA DO202G 2-Wire Dissolved Oxygen Analyzer |
YOKOGAWA DO202G 2-Wire Dissolved Oxygen Analyzer
Flexibility, reliability and low maintenance are among the benefits provided by the EXA DO202 2-wire dissolved oxygen analyzers. Designed to meet the exacting requirements of dissolved oxygen analysis in the modern industrial environment, it contains many features to ensure the best precision whatever the application.
The DO202 is a SMART transmitter. Digital communication is done either through HART® protocol superimposed on the 4- 20 mA current or completely digital through Fieldbus communication: Fieldbus Foundation.
For high precision the DO202 offers automatic temperature compensation for both % saturation and ppm/ppb measurements; manual salinity compensation for analysis in saline water and manual pressure compensation for accurate analysis at high elevations or in reactors with high static pressure like production fermenters.
Featuers
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Universal input accepts Galvanic and Polarographic sensors and various temperature compensating elements (Pt1000, 22k NTC). |
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HART® communication standard with 4 to 20 mA loop powered model, Fieldbus models for Foundation Fieldbus, PROFIBUS models for PROFIBUS-PA. |
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Wide measuring range including ppb, ppm and % saturation. |
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Recommended sensors model DO30G, OXYFERM, OXYGOLD (for ppb measurement). |
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Automatic temperature compensation from 0 up to 100℃. |
Specifications
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Input specifications |
Input range is 0 to 50 μA for Galvanic sensors and 0 to 1 μA for polaro-graphic sensors. For temperature compensation the DO202 accepts Pt1000 (DO30G) and 22k NTC elements (OXYFERM and OXYGOLD sensors). |
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Measuring range |
Dissolved Oxygen: 0 to 50 ppm (mg Oxygen/kg water); 0 to 1999 ppb (mg Oxygen/1000 kg water) and 0 to 600 % Saturation of Air in Water.
Temperature: -20 to 150℃ (-4 to 302℉). |
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Temperature compensation |
Automatic using Pt1000 or 22k NTC or manual.
Range: 0 to 100℃ (32 to 212℉) |
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Calibration |
Semi-automatic one or two point calibration in air or in water using solubility tables of ISO 5814. The influence of pressure and salinity is taken into account when these specifications are entered. Also a two point manual calibration is possible. |
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Transmission Signals |
Isolated output of 4 to 20 mA DC, Burn up (21 mA) or Burn dwon (3.6 mA when HART comm. non-used, 3.9 mA when HART comm. used) or pulse of 21 mA to signal failure. |
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Communication |
mA-HART®, PROFIBUS-PA, Foundation Fieldbus |
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Ambient temperature |
-10 to 55℃ (10 to 130℉) |
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Humidity |
10 to 90 % RH, non-condensing |
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Housing |
Cast aluminum housing with chemically resistant coating, cover with flexible polycarbonate window. Case color is off-white with moss green cover. Cable entry is through two polyamide cable glands. Cable glands are provides for wiring up to 2.5 mm. |
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Environmental protection |
IP65, NEMA 4X, Type 3S |
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Mounting |
Pipe, wall or panel mounting using optional hardware. |
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Power supply |
Nominal 24 volt DC loop powered system
DO202G-A: up to 40 volts
DO202S-A, -N: up to 31.5 volts
DO202G/S-F, -P: 9-24, 9-17.5 (FISCO) V DC / 26.0 mA
DO202S-B, -D: 9-32 V DC / 26.0 mA |
Performance (ppm Mode)
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Linearity |
±0.05 ppm or ±0.8 % FS, whichever is greater |
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Repeatability |
±0.05 ppm or ±0.8 % FS, whichever is greater |
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Accuracy |
±0.05 ppm or ±0.8 % FS, whichever is greater | |
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