YOKOGAWA FLXA21 Modular 2-Wire Dissolved Oxygen Analyzer
The FLXA21 two-wire liquid analyzer offers single or dual sensor measurement. The modular-designed analyzer offers 4 kinds of measurements – pH/ORP (oxidation-reduction potential), contacting conductivity (SC), inductive conductivity (ISC) or dissolved oxygen (DO) – with the respective sensor module.
The FLXA21 Dissolved Oxygen Analyzer is a process analyzer with advanced functions and high reliability and requires less maintenance, so it is suitable for installation in the field and can even be used under harsh environments.
Not only a galvanic sensor but also a polarographic sensor can be used. It can display the dissolved oxygen concentration in units of mg/l, ppm, and percent saturation (%sat), and can make corrections for air pressure that changes with the altitude, etc., for the change in salt content of water, and for the change in temperature.
For the wide range of industrial environment, the FLXA21 Dissolved Oxygen Analyzer is designed with the enclosure of plastic, stainless steel or stainless steel with corrosion resistant coating.
Featuers
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Dual sensor measurement on 2-wire type analyzer; DO sensor and DO sensor |
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Calculated data from dual sensor measurement |
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Redundant system on dual sensor measurement |
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Easy touch screen operation on 2-wire type analyzer |
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Simple HMI menu structure in 12 languages
(English, German, Portuguese, Russian, Chinese, Korean, Japanese, French, Italian, Spanish, Czech and Polish New) |
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Quick setup menu for immediate measurement |
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On-line sensor checking and indication of sensor wellness |
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HART communications |
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Enclosure – plastic, stainless steel or stainless steel with corrosion-resistant coating |
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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Input Range |
DO30 sensor:
Dissolved Oxygen: 0 to 50mg/l (ppm)
Oxyferm sensor:
Measurement range: 10ppb to 40ppm
Temperature range: 0 to 130℃
Oxygold G sensor:
Measurement range: 2ppb to 40 ppm
Temperature range: 0 to 130℃
Oxygold B sensor:
Measurement range: 8ppb to 40 ppm
Temperature range: 0 to 100℃ |
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Output Range |
DO30 sensor:
DO concentration :min.: 1mg/l(ppm), maxi.: 50mg/l(ppm)
% saturation:min.: 10%, maxi.: 300%
Temperature: -20 to 150℃
Oxyferm sensor:
Measurement range: 10ppb to 40ppm
Temperature range: 0 to 130℃
Oxygold G sensor:
Measurement range: 2ppb to 40ppm
Temperature range: 0 to 130℃
Oxygold B sensor:
Measurement range: 8ppb to 40ppm
Temperature range: 0 to 100℃ |
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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 |
One output of 4 to 20mA DC, Burn up (22mA) or Burn dwon (3.6mA) to signal failure. |
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Communication |
mA-HART |
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Explosion-proof |
ATEX, IECEx, FM, CSA (pending) |
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Analyzer Structure |
Module structure |
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Housing |
Case: Plastic (Polycarbonate), stainless steel without painting, stainless steel with epoxy coating, stainless steel with urethane coating
Window: Polycarbonate (flexible)
Protection: NEMA4X, IP66 |
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Environment and operation conditions |
Ambient Temperature: -20 to 55℃
Storage Temperature:-30 to +70℃
Humidity: 10 to 95 % RH (Non-condensing) |
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Regulatory Compliance |
Safety : EN61010-1, CSA C22.2 No.61010-1(pending)
EMC : EN61326-1 Class A,Table 2 (For use in industrial locations), EN61326-2-3, AS/NZS CISPR11, Korea Electromagnetic Conformity Standard
Installation altitude: 2000 m or less
Category based on IEC 61010: I
Pollution degree based on IEC 61010: 2 |
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Power supply |
Nominal 24 V DC loop powered system
One (1) Sensor module (1 input): 16 to 40V DC
Two (2) Sensor modules (2 inputs): 22.8 to 40V DC |
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Conduit Adapter |
G1/2, 1/2NPT, M20 x 1.5 |
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Weight |
Approx. 1kg (Plastic housing), Approx. 2kg (Stainless steel housing) |
Performance (Accuracy)
(The specifications are expressed with simulated inputs.)
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Performance in ppm mode |
Linearity: ±0.05 ppm or ±0.8% F.S., whichever is greater
Repeatability: ±0.05 ppm or ±0.8% F.S., whichever is greater
Accuracy: ±0.05 ppm or ±0.8% F.S., whichever is greater |
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Performance in ppb mode |
Linearity: ±1 ppb or ±0.8% F.S., whichever is greater
Repeatability: ±1 ppb or ±0.8% F.S., whichever is greater
Accuracy: ±1 ppb or ±0.8% F.S., whichever is greater |
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Temperature |
Linearity: ±0.3℃
Repeatability: ±0.1℃
Accuracy: ±0.3℃ | |
