Instruction manual

Instruction manual αlpha DO 2000
32
8 TECHNICAL SPECIFICATIONS
8.1 Measurement and Compensation
(a) Dissolved Oxygen
Dissolved Oxygen Measuring Range 0.00 to 25.00 mg/l or 0.00 to 25.00ppm or
00.0 to 300.0 % Saturation
Resolution 0.01 mg/l or 0.01 ppm or
0.1 %
Relative accuracy 1.5 % of full-scale reading for all ranges
(b) Temperature
Temperature measuring range -10.0 to +125.0
o
C or
+14.0 to +257.0
o
F
Resolution 0.1
o
C or
0.1
o
F
Relative accuracy 0.5
o
C or
1.0
o
F
Sensor Pt100 or Pt1000 (Jumper Selectable)
– 2 wire or 3 wire
(c) Compensation
Temperature Compensation Automatic or Manual
Pressure Compensation 0.740 to 3.000 BAR or 555 to 2250 mmHg
or 10.73 to 43.51 PSI
(Manual setting and automatic correction)
Salinity Compensation 0.0 to 50.0 ppt
(Manual setting and automatic correction)
8.2 Set-point and control function – Relay 1 & Relay 2
Function Switchable
- Selection in Control (CNTR) function of
Setup
Off
Limit Control
P/PI Control (Pulse length / Pulse frequency)
(a) Off
The control function of the controller is off SP1 & SP2 function will not appear in setup when Off is
selected in CNTR function to off mode
(b) Limit Control & P/PI Control
Relay contact selection for active mode Energise (EN) or
De-energise (DEEN)
Set Point 1 (SP1) 0.0 to 300.0 % (0.00 to 25.00 mg/l) (0.00 to 25.00 ppm)
Set Point 2 (SP2) 0.0 to 300.0 % (0.00 to 25.00 mg/l) (0.00 to 25.00 ppm)
Active mode selection (for SP1 & SP2) LO (Relay is active when measured value < set point)
HI (Relay is active when measured value > set point)
Hysteresis (for SP1 & SP2) 1.0 to 10.0 %
On (pickup) Delay (for SP1 & SP2) 0 to 2000 seconds
Off (Dropout) Delay (for SP1 & SP2) 0 to 2000 seconds