Specification
MXD70 Dissolved Oxygen
Setup and Operating Guide
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Specification
Dissolved Oxygen Input Card Specification
Measurement Input
Galvanic (Mackereth) – 0 to 4000μA
Or
Polargraphic (Clark) – 0 to 500.0nA
Sensor Bias Voltage
User defined -1.000V to +1.000V, ±1mV Resolution,
±3mV Output Accuracy.
Membrane Correction Factor
User defined 0 to 9999
Sensor Connection Cable
Up to 100 meters
Ranges of Measurement
0 – 199.9 % Saturation
0 – 30.00 ppm Concentration
0 – 9999 mBar pO
2
(Partial Pressure of Oxygen)(Calibration
specific)
0 – 999.9 mmHg (Millimetres of Mercury)(Calibration
specific)
0 - 30.00 mg/l Milligrams per Litre
Sensor Current (μA, nA)
Accuracy
±3μA (Galvanic Mode)
±1.0nA (Polargraphic Mode)
Linearity
±0.1% of Range
Repeatability
±0.1% of Range
Calibration
Automatic Zero (offset) and Span (slope) calibration with
user entered span calibration point and post-calibration
sensor condition indication.
Calibration Timer
Inbuilt calibration count down timer which will trigger an
alarm when calibration interval has expired.
Sensor Input Filter
Adjustable filter that averages the sensor input over a user
selectable time (10sec – 5mins).
Temperature Sensor
Pt100, Pt1000, LTH 1k and BJ 22k input. Up to 100 meters of
4 wire cable. Temperature sensor can be mounted in the
sensor or separately.
Range of Temperature
Measurement
-50 °C to +160 °C (-58 °F to +320 °F) for full specification.
Temperature accuracy
± 0.2 °C (When using a 4 wire PT1000).
Operator Temperature Adjustment
± 50 °C or ± 122 °F.
Temperature Compensation
Automatic or manual -20°C to +160°C.
Pressure Compensation
Automatically from external 4-20mA pressure transducer
input (Direct or 24V loop powered from the instrument) with
user scaling and selectable pressure damping, or manually
via user entered value.
Salinity Compensation
User Programmable from 0 – 40.0 ppt.
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