Product Details

AquaSensors RDO® Pro Optical Dissolved Oxygen Sensor



Product Features


:: The latest generation in rugged luminescent dissolved oxygen technology for wastewater monitoring

:: 0 to 20 ppm measurement range

:: No membranes—only annual field replaceable caps

:: High precision & accuracy with fast & stable response

:: No conditioning necessary prior to use—fast start up

:: Reduced maintenance—long lasting calibration

:: Resists photo-bleaching and abrasive process media

:: No “poisoning” by sulfides

:: No cross sensitivity to carbon dioxide, ammonia, pH, sulfide, sulfate, chloride, or hydrogen sulfide

:: Plug & play design with digital network Interface

:: Immersion and ball-float mounting configurations

:: Versatile mounting configurations




Product Specification



Range : 0 to 20 ppm, 0 to 200% saturation


Resolution: Below 10 ppm; 0.01 ppm, 0.1% sat ; Above 10 ppm; 0.1 ppm, 0.1% sat


Accuracy: ± 0.1 ppm up to 8 ppm ;± 0.2 ppm from 8 to 20 ppm

Step Response Time

90% in 30 seconds (at 25 °C) 95% in 37 seconds

Operational Environment

Temperature Range: 0 °C to 50 °C (32 °F to 122 °F)
Maximum Pressure: 300 psig @ 50 °C
Maximum Flow Rate: No flow required

Requirements #

Voltage Range: 8 to 36 VDC

IP Rating Environmental: IP-67 with cap off,IP‑68 with cap installed


Sensor Head Material: Delrin® & Polystyrene
Weight: 0.93 lbs (without cable)
Dimensions: 8 inches long (203.2 mm)
1.85 inch diameter (47 mm)
Mounting Requirements: 1.25 inch NPT
(internal thread on back of sensor for

adapting to immersion hardware and floats)

Units of Measure

Measurement Units: Dynamic Luminescence
Temperature Units: °C, °F


Air: Automatically adjusts for set pressure
Sample: 1 point
Zero: 1 point
Temperature: 1 point

Measure Modes

Dissolved Oxygen: ppm, %
Temperature: Automatic from –5 °C to 50 °C

Output/ Communications

Oxygen: Partial pressure, ppm and % sat
Temperature: °C, °F
Digital Protocol: Modbus RTU (RS485)

Configuration Options

Sensor Filter: 0 to 100 seconds
Temperature Filter: 0 to 100 seconds



# Class II DC power supply required
* Use either air saturated water, or water saturated air as preferred methods.



Municipal and industrial wastewater, Aquaculture, Brewing, Fermentation, Bio-processing


Ordering Information (Conductivity Sensor)


Part No.



Optical RDO Pro Sensor with Modbus RTU (RS485)  Interface and 30’ (10 m) cable

Note: Consult for additional configurations and accessories


Thermo Scientific AV38 DataStick Local Monitor and Controller


DataStick™ Local Monitor and Controller


:: Connects to any DataStick system
:: Convenient ¼ DIN enclosure

:: Display sensor and temperature data

:: Menu functions: Calibration, configuration and diagnostics

:: Digital protocol options for remote measurement, calibration, configuration and diagnostics

:: Two 4 to 20 mA current outputs

:: Two Form C relays for alarm, control and wash

:: PID controller for use with pH and conductivity

:: 7 conduit knockouts for easy cabling




Product Specification


Mounting Options

Wall-mount Enclosure: NEMA 4X
Panel-mount: ¼ or ½ DIN NEMA
4X panel mount available
Display Only: with NEMA 4X gasket

User Interface

Display: 2 line by 16 character LCD
Backlight: High contrast green
Keypad: 4 directional arrows, MENU,

Environmental Conditions

Ambient Operating Temperature Range:
–20 to 65 °C
Maximum Relative Humidity:
95% non-condensing

DataStick Sensor Connections

Supports 1 to 255 Modbus® RTU DataStick Sensors of any type
Supported Sensors: pH, ORP, two electrode conductivity, two electrode resistivity, toroidal
conductivity, dissolved oxygen (ppm and ppb) dissolved ozone, drinking water and wide-range turbidity, suspended solids and free chlorine

4 to 20 Milliamp Current Output Options

Assignable parameters
PID function when pH or conductivity parameter selected Loop power provided by AV38


Two 1 amp Form C relays with NO and
NC contacts
Assignable parameters
Configured for alarm, control and timer


Options to Host Computer Network:
MODBUS® RTU, DeviceNet,
Modbus RS232, RS232 ASCII, CANopen,
Ethernet IP, Modbus TCP, TCP/IP
Others: Consult factory

Power Supply

Input: 10 to 30 VDC or 100 to 240 VAC
Power: 2W at 25°C


Meets CE requirements for heavy
industrial use


Order Information


Part No.



Local Monitor/Controller

Current Outputs (v)

B = One
C = Two

Mounting (w)

B = ¼ DIN NEMA 4X Wall-mount Enclosure

Communications (x)

0 = None
1 = RS232 ASCII
2 = Modbus RS232
4 = MODBUS RTU (for Modbus + Profibus)
5 = DeviceNet
6 = CANopen
7 = Ethernet IP, Modbus TCP, TCP/IP

Relays (y)

A = None
C = Two

Power (z)

1 = 24 VDC
2 = 100 to 240 VAC


Download Brochure

RDO® Pro Optical Dissolved Oxygen Sensor
AV38 Datastick Local Monitor And Controller

© Copyright 2010 ITLIPL Designed by DBS   Home | About Us | Products | What's New | Career | Clients | Contact Us