Onset S-BPB-CM50 Specifications

Barometric Pressure Smart Sensor (S-BPB-CM50) Manual

The S-BPB barometric pressure smart sensor easily plugs into HOBO® stations with smart
sensor inputs. All calibration parameters are stored inside the smart sensor, which
automatically communicates configuration information to the station without any
programming or extensive user setup.

The S-BPB barometric pressure smart sensor has a rugged, outdoor rated, weatherproof
housing. The sensor is mounted outside the logger enclosure, so the logger does not need to be
open to the atmosphere.

Specifications

Measurement Range 660 to 1070 mbar (19.47 to 31.55 in. Hg)

±3.0 mbar (0.088 in. Hg) over full pressure range at 25°C (77°F);
maximum error of ±5.0 mbar (0.148 in. Hg) over -40° to 70°C (-40° to
158°F)

0.1 mbar (.003 in. Hg)

1.0 mbar (0.03 in. Hg) per year

-40° to 70°C (-40° to 158°F)

Weatherproof

6.4 cm (2.5 in) diameter x 5.1 cm (2 in) height

96 gm (3.4 oz)

50 cm (20 in.)

The CE Marking identifies this product as complying with all relevant
directives in the European Union (EU).

Barometric Pressure
Smart Sensor

S-BPB-CM50

Items Included:

• Two cable ties

• Two self-tapping screws

Accessories:

• Smart sensor extension
cables (S-EXT-M-0xx)

• Weatherproof connection
housing (S-EXT-CASE)

• Cable caddy (M-CDY)

Accuracy

Resolution

Drift

Operating Temperature Range

Environmental Rating

Dimensions

Weight

Bits per Sample 12

Number of Data Channels* 1

Measurement Averaging Option Yes

Cable Length Available 50 cm (20 in.)

Length of Smart Sensor
Network Cable*

* A single HOBO station can accommodate 15 data channels and up to 100 m (328 ft) of smart sensor cable (the digital

communications portion of the sensor cables).

Operation

The barometric pressure smart sensor supports measurement averaging. When measurement
averaging is enabled, data is sampled more frequently than it is logged. The multiple samples
are then averaged together and the average value is stored as the data for the interval.

For example, if the logging interval is set at 10 minutes and the sampling interval is set at 1
minute, each data point in the data file will be the average of 10 measurements. Measurement
averaging is useful for reducing noise in the data. Onset recommends that measurement
averaging be used when the barometric pressure smart sensor is used in a windy location. Note
that fast sampling intervals (less than 1 minute) may significantly reduce battery life.

Maintenance

Use a damp sponge or rag to clean the barometric pressure smart sensor housing if it gets dirty.
Under no circumstances should the unit be immersed in water or any other cleaning solvent.

Do not open the sensor as there are no user-serviceable parts inside.

Important: The sensor will give inaccurate measurements if exposed to light by removing the
cap.

12291-E MAN-S-BPB

Barometric Pressure Smart Sensor (S-BPB-CM50) Manual

Mounting the Sensor

Guidelines

• Mount the S-BPB barometric pressure smart sensor
outside the logger, either on a mast or a flat, vertical
surface.

• The sensor must be mounted vertically to prevent water
from collecting under the cap.

• Mount the sensor so that the cable is hanging straight
down and create a drip-loop to prevent moisture from
entering the logger connection.

Flat Surface: To mount the sensor on a flat, vertical surface, use
the #8 x 1 self-tapping screws provided.

CAUTION: Do not screw the sensor to the side of the HOBO
station case. Inserting screws in the side of the HOBO station
case will violate the integrity of the unit. You can use double­sided tape.

Connecting the Sensor to a Station

To connect the sensor to a station, stop the station from
logging and insert the smart sensor’s modular jack into an
available smart sensor port on the station. See the station
manual for details on operating stations with smart sensors.

Verifying Sensor Accuracy

It is recommended that you check the accuracy of the
barometric pressure smart sensor annually. The barometric
pressure smart sensor cannot be re-calibrated. Onset uses
precision components to obtain accurate measurements. If the
smart sensor is not providing accurate data, then it may be
damaged and should be replaced. If you are unsure of the
accuracy, you can send the smart sensor back to Onset for re­certification. Contact Onset or your dealer for a Return
Merchandise Authorization (RMA) number before returning it.

Mounting Options

Tripod: To mount the S-BPB on a pole or Onset tripod mast, use

the cable ties provided, as shown in below.

S-BPB Mounted to a Tripod Mast

Onset Cable Caddy: To mount the sensor on the side of the

Onset Cable Caddy (M-CDY), use the 8-32 x 3/8 Phillips pan
head screws provided with the Cable Caddy, as shown below.

S-BPB Mounted to Cable Caddy

1-800-LOGGERS (564-4377) • 508-759-9500
www.onsetcomp.com • [e-mail]

© 2009–2015 Onset Computer Corporation. All rights reserved. Onset and HOBO are trademarks or
registered trademarks of Onset Computer Corporation.

12291-E MAN-S-BPB