RDO® Blue Optical Dissolved Oxygen Sensor
RDO BLUE IS AN OPTICAL DISSOLVED OXYGEN SENSOR
DESIGNED FOR DEMANDING ENVIRONMENTS WHERE YOU
NEED RELIABLE DO MEASUREMENTS AND WIDESPREAD
COVERAGE TO OPTIMIZE YOUR SITE.
RDO Blue is suitable for freshwater or saltwater applications andis ready for connection with transmitters, controllers, dataloggers,or telemetry. RDO Blue can also be used in a hand-held configuration
for spot-checks and site assessments.
DO MORE FOR LESSRDO Blue sensors are low power, low maintenance, and low cost soyou can monitor wherever you need to. Instead of spot-checking sites
with a shared probe or installing one sensor per site, pond, or tank, youcan affordably install RDO Blue in multiple locations for comprehensive
insight about DO conditions that affect your aquatic organisms.
For aquaculture applications, this will help you optimize aeration andfeeding to lower operational costs while maintaining the health ofyour stock. For environmental applications, access to data from more
locations allows you to fully characterize your site, identify problem
areas, and gain valuable insight to guide decisions.

ENHANCED RELIABILITY
The redesigned RDO Blue is made from Ryton, a high-performancematerial used to replace metal parts in automotive and heavy industrial
applications. It’s lightweight, strong, and resistant to chemicals,
corrosion, abrasion, UV exposure, and high heat.
Anti-rotational teeth lock the housing and sensor tip together to provide
a strong, reliable connection between parts. Internal potting around thecable connection ensures the electronics are protected from humidity
even in tough conditions.
SHARED ECOSYSTEM
With the Twist-Lock option, RDO Blue plugs into the In-Situ ecosystem
and allows you to collect readings, calibrate, and manage the instrumentwith a Wireless TROLL Com and VuSituTM. This mobile solution keeps
your data organized and geographically accurate by enabling datacollection at distinct sites with GPS tags. With your logged data, you
can conveniently email, share or export log files right from your mobile
device so that your information is accessible when you need it.
You can also connect RDO Blue to VuLinkTM to create a simple andcomplete solution with power, logging, and telemetry for your critical
DO data. With HydroVuTM for advanced data visualization and site
information, you get a comprehensive overview of your monitoring sites
and can set up alarms for notification of critical site conditions.

Applications:• POND AQUACULTURE

www.in-situ.com
1-800-446-7488 (toll-free in U.S.A. and Canada)
1-970-498-1500 (U.S.A. and international)• RECIRCULATING AQUACULTURE SYSTEMS• OPEN PEN AQUACULTURE• SURFACE WATER SPOT SAMPLING• REMOTE MONITORING VIA TELEMETRYRDO® Blue Optical Dissolved Oxygen Sensor
SENSOR RATINGSSENSOR TYPE

Optical Dissolved Oxygen Sensor

RANGE, DO

0-60 mg/L; 0-600% Saturation

ACCURACY, DO+/- 0.1 mg/L (0-20 mg/L)+/-2% (20-60 mg/L)

RESOLUTION, DO

0.01 mg/L

RESPONSE TIME, CAP

T63<5s, T90<45s, T95<60s (RDO-X cap)

UNITS, DO

mg/L, ppm, % saturation

RANGE, TEMP.

-5°C to 50°C (23°F to 122°F)

ACCURACY, TEMP.

+/- 0.1ºC

RESOLUTION, TEMP.

0.01ºCUNITS, TEMP.

Celsius, Fahrenheit

SALINITY COMP.

Fixed or real-time capable

BAROMETRIC COMP.

Fixed or real-time capable

METHODS

EPA-approved In-Situ® RDO methods 1002-8-2009,1003-8-2009, 1004-8-2009 Standard Methods 4500-O

ENVIRONMENTAL RATINGSPRESSURE

150 psi from 0° to 50°C

DEPTH

100m (328ft) @ 25°C

OPERATING TEMP.
(NON-FREEZING)-5.0°C to + 50.0°C (23°F to 122°F)

STORAGE TEMP.

-40°C to + 65°C (-40°F to 149°F)

COMPLIANCE

EMC 2014/30/EU
IEC 61000-6-2:2005
EN 55011:2009

IP RATING

IP-67 with sensor cap off; IP-68 with sensor cap installed

CHEMICAL RATINGSINTERFERENCES

Alcohols >5%; hydrogen peroxide > 3%; sodiumhypochlorite (commercial bleach) > 3%; gaseous
sulfur dioxide; gaseous chlorine. Do not use in organic
solvents (e.g., acetone, chloroform, methylene chloride,etc.), which may swell the sensing element (foil matrix)
and destroy it.

GENERAL RATINGSDIMENSIONS

L 22.06 cm (8.69 in) x D 2.95 cm (1.16 in)

WEIGHT

205 g (0.5 lb) (without cable)

WETTED MATERIALS

Ryton® (PPS), Cycoloy® (PC/ABS), PC/PMMA, TPU

COMMUNICATION OUTPUT

Modbus/RS485

READING RATE

1 reading every 1 second

EXTERNAL POWERREQUIREMENTS

8 to 36 VDC (20mA at 8 VDC peak)

POWER CONSUMPTIONPower On: 3mA at 16 VDC for 0.7s
Reading: 8mA at 16 VDC for 0.75s
Idle: 2mA at 16 VDCWARRANTY

2 years from date of shipment

RDO BLUE FEATURES PATENTED RDO TECHNOLOGY,INCLUDING:
EPA-Approved Method
RDO luminescence-quenching sensors have been proven throughextensive lab testing, and the methodology has been approved by
the United States EPA. RDO sensors do not consume oxygen anddo not require water movement for accurate measurements.
Smart Sensor Cap
RDO sensing foils are calibrated at 90 discrete points andthe calibration coefficients are stored in the replaceable cap.
Simply press it on and you’re ready to go, no data entry or extra
steps needed.
Abrasion ResistanceA unique, three-layer system provides unmatched chemical andabrasion resistance, extending the life of the sensor cap andexpanding the range of compatible conditions.
Instant Hydration Conditioning
RDO sensors do not require 12-24 hours of hydration
conditioning and read accurately within 90 seconds of goingfrom dry to wet conditions.
Liquid and Gas Formulation
The RDO system measures accurately in both liquid and gas
without requiring separate calibrations or change of settings.
Smart Addressing
All RDO instruments have an easy-to-configure Modbus
interface, so they’re ready for integration into another system
and access to data is reliable.
Enhanced Reliability
The RDO Blue’s construction out of Ryton with complete internal
potting creates a solid core and provides strength and chemical
resistance to eliminate most common failures.

NOTES: Ryton is a registered trademark of Solvay SA.; Cycoloy is a registered trademark of SABIC GLOBAL Technologies B.V.

www.in-situ.com
1-800-446-7488 (toll-free in U.S.A. and Canada) • 1-970-498-1500 (U.S.A. and international)
221 East Lincoln Avenue, Fort Collins, CO 80524 USA
Copyright © 2022 In-Situ Inc. All rights reserved. May 2022