Instruction Manual
Alpha DO 500
33
6. Technical Specifications
General Specification
(a) Dissolved Oxygen (% saturation)
Measuring Range
0.00 to 199.9 %
Resolution 0.1
%
Relative Accuracy
± 1.5% of full-scale reading
(b) Dissolved Oxygen (ppm or mg/l)
Measuring Range
0.00 to 19.99 ppm or 0.00 to 19.99 mg/l
Resolution
0.01 ppm or 0.01 mg/l
Relative Accuracy
± 1.5% of full-scale reading
(c) Temperature
Measuring range
0.0 to +100.0
o
C
Resolution 0.1
o
C
Relative accuracy
± 0.5
o
C
Sensor
Pt100 (2 wire or 3 wire)
Calibration
(a) Dissolved Oxygen
Number of calibration points
1 or 2 points
(b) Temperature
Offset Adjustment
± 10 C
Compensation
Temperature Compensation
Automatic or Manual (0 to 50
o
C)
Pressure Compensation
0.74 to 3.00 BAR
550 mmHg to 2250 mmHg (225 cmHg)
10.7 to 43.5 PSI
(Manual setting and automatic correction)
Salinity Compensation
0.0 to 50.0 ppt
(Manual setting and automatic correction)
Output Parameters
Output Current
4 to 20 mA (Galvanically Isolated)
Over/Under Range Output
Current
ON Select : 3.8 mA
OFF Select: 4 mA (under range), 20 mA (over
range)
HOLD Output Current
ON Select : 22 mA
OFF Select : Last measured current
Load Resistance
600 ohms (max.) at 24V
Display
LCD
7 segments display with symbols for status
information
Electrical Data and Connections
DO Input
Screw Terminal (3.5mm pitch)
Connection terminal
8-pin & 3-pin terminal blocks