Your Path Through the Sea
MARINE
Submersible CT and CTD Recorders
FRESHWATER
CRYOSPHERIC
For Conductivity, Temperature and Depth
Loggers for CT and CTD
These recorders will provide derived measurements of Salinity, Speed of Sound and Density
The XR series CT/CTD offer three conductivity sensors; two case styles; and a maximum sampling rate of 1Hz or
6Hz. Temperature may be measured internally, or with an external probe of time constant 3s or ~0.1s.
Conductivity Measurement
The RBR XR series offer three sensors for conductivity,
each with different applications.
Inductive cell
This is the simplest and most
rugged sensor. It has one
range, from 0 to 70mS/cm and
is sufficiently robust that it may
be frozen into the water. Noise
level is ~3S/cm rms
This option is specified with a
suffix m.
Electrode contact cell
This provides high resolution
measurements in fresh water.
The range is 0 to 2mS/cm.
The noise level of this sensor
is about 0.2S/cm rms.
Specify with a f suffix.
Software
Integrated RBR Windows software is available at
no additional charge for all of our instruments. See
reverse for further details or check our website for
details, downloads and upgrades.
Zero External Field Inductive cell
(ZEFICC). This innovation
permits the use of an inductive
cell without external field. The
principle is to dynamically
cancel the external field of
the cell. This is valuable in the
presence of mooring structures.
This option may be selected by
using a suffix z in the model
number.
Outline Specifications
Conductivity:
0.003 mS/cm
Temperature:
0.002C ITS-90
Depth:
0.05% full scale (standard)
See overleaf for full specifications
Other Sensors
Sensors are available for a wide range of standard
parameters. See the multichannel data sheet for more
details.
RBR Ltd.
RBR Europe Ltd.
27 Monk Street, Ottawa, ON Canada K1S 3Y7
Tel: +1 613 233-1621 Fax: +1 613 233-4100
info@rbr-global.com
www.rbr-global.com
17 Cratlands Close, Stadhampton,
Oxfordshire, OX44 7TU United Kingdom
Tel/Fax: +44 (0)1865 890979
info@rbr-europe.com
www.rbr-europe.com
05/08
Your Path Through the Sea
MARINE
FRESHWATER
Submersible CT and CTD Recorders
CRYOSPHERIC
For Conductivity, Temperature and Depth
Conductivity, Temperature and Depth
General Specifications
Measurement Specifications
Case Size:
Material:
Conductivity
310 or 420mm x 65mm diameter
Acetal copolymer: to 740m
Titanium: to 6,600m
Memory:
8Mbyte Flash (2,400,000 samples)
(May be extended to 2 Gbyte)
Power:
Four CR123A Lithium (3V) standard
camera batteries or external power (6 to
15 V).
Battery power sufficient for 2,400,000
readings or three years of operation
Weight:
1260g in air, 389g in water (Delrin)
2400g in air, 1530g in water (titanium)
Calibration:
NIST traceable standards
Clock Accuracy: 32 seconds/year
Sample Rates:
Up to 1Hz (XR-420)
Up to 6Hz (XR-620)
Communications: RS-232/485 RF Modem control or
GSM/CDMA modem
Download Speed: ~115,000 samples/minute RS232
Or USB for large memory option
Ordering Information
Inductive:
Electrode:
ZEFICC:
Select depth range:
XR-420CT(D)m XR-620CT(D)m
XR-420CT(D)f
XR-620CT(D)f
XR-420CT(D)z
XR-620CT(D)z
10/20/50/100/200/500/740m
1000/2000/4000/6000m
Select fast temperature probe (~0.1s) if required
Range:
Accuracy:
Drift:
Resolution:
Time Constant:
Measurement:
0 to 2mS/cm or 0 to 85mS/cm.
Extended ranges available
0.003 mS/cm at 35psu 15C
0.005 mS/cm over 5 to 25C
<0.0005 mS/cm
Set by flow through cell
Inductive or Electrode cell
Zero external field inductive option.
Temperature
Range:
Accuracy:
Resolution:
Time Constant:
-5 C to 35 C Standard
-40C to +50 optional
0.002 C
(ITS-90 and NIST traceable standards)
<0.00005 C
~3 sec (standard)
~0.1 sec (option)
< 20 sec (internal)
Depth (Optional)
Range:
10/20/50/100/200/500/740/1000/
2000/4000/6000m (dBar)
Accuracy:
0.05% full scale
Resolution:
<0.001% full scale
Time Constant: < 10 msec
Sensor Type:
Keller strain gauge
Option: Quartz resonant gauge 0.015%
For further information on sensor performance please
contact RBR.
Other Options
External serial connector
External power connector
Interface for modem
RBR Ltd.
RBR Europe Ltd.
27 Monk Street, Ottawa, ON Canada K1S 3Y7
Tel: +1 613 233-1621 Fax: +1 613 233-4100
info@rbr-global.com
www.rbr-global.com
17 Cratlands Close, Stadhampton,
Oxfordshire, OX44 7TU United Kingdom
Tel/Fax: +44 (0)1865 890979
info@rbr-europe.com
www.rbr-europe.com
05/08
