pH and DO analyzer with the Hamilton Oxysens DO electrode on line RS-485, IP-65 and control relays.


pH, Dissolved Oxygen, Temperature In-line Analyzer. 1/4 DIN, IP65, panel mount pH/DO/Temp analyzer with 2 wire 4-20mA current output, 2 sets of programmable on/off relay, RS485 output and backlight.

  • Graphic LCD with manual backlight displays pH, dissolved oxygen,temperature, relay status and transmitter current mA output simultaneously.
  • Automatic buffer recognition of US and European buffer sets.Calibration data is stored in memory and is ready for use on power up.
  • Isolated and reversible 4-20 mA current output for pH/ dissolved oxygen allows it to be used as a proportional output.
  • 5 programmable on/off relays: 2 for pH, 2 for dissolved oxygen and 1 for temperature.
  • RS-485 output for remote access via an compatible computer allows multiple units to be connected and ganged together.
  • Password protection.
  • IP65 watertight case.


pH Range
-2.00 to 16.00 pH
pH Resolution
0.01 pH
pH Accuracy
± 0.01 pH ± 0.01 digit
DO Range
0.00 to 60.00 ppm / 0.0 to 500.0 %
DO Resolution
0.01 ppm / 0.1 %
DO Accuracy
±0.2 % FS
Temperature Range
-10.0 to 120.0 °C
Temperature Resolution
0.1 °C
Temperature Accuracy
± 0.1 °C
pH Buffer Recognition
US(4.01,7.00,10.01) or NIST(4.00,6.86,9.18) user selectable
pH Electrode Offset Recognition
±100mV at pH 7.00 /-97.7mV to 108.3mV at pH 6.86
pH Electrode Slope Recognition
±30% at pH 4.00 , 4.01, 9.18 or 10.01
pH input impedance
Auto /manual -5.0 to 125.0 °C
Input impedance
>10(exp)13 ohms
Salinity Compensation
Manual 0.0 to 49.9 ppt
Pressure Compensation
Manual 600 to 1100mBar
Temperature Compensation
Auto 0 to 80 °C, 22K ohm NTC
Output Select
User selectable pH or Dissolved oxygen
Current Output Range
4 to 20 mA(isolated),programmable span
Current Output Scale
User programmable ,linear or log
Maximum Load
500 ohm
Isolation Voltage
500V DC
Control Type
5 ON/OFF controls
Relay Output
5A at 115V AC or 2.5A at 220V AC, resistive load only
128 x 64 graphical LCD with backlight
4 dight password
115 V AC or 230V AC at 50/60 Hz
Ambient Temperature Range
From 0 to 50 °C
950 grams
IP 65 ,1/4 DIN case, 148mm depth

Documentation and Supports