Barometer
Modules
General Purpose Instruments for PIEZO-RM Range Sensors
General Purpose Instruments for PIEZO-
Water Services
Part Numbers: Barom-SDI12
/ Barom-RS485
Barom-RS485
model
Barom-SDI12
model
PIEZO-BARO
Barometer Modules
The images above show the standard range of precision digital barometer modules available from Keynes Controls. All of the sensors read barometric and temperature levels internally and report data in engineering units across a digital network.
Both of the Barom-SDI12
and Barom-RS485 models are
suitable for mounting onto a panel or into a box with a data logger.
These models are fully encapsulated and safe from short term immersion.
A 4 mm vent port enables an external tube to connect the atmospheric
feed from a more suitable location than where the sensor is mounted.
The PIEZO-BARO
is a more accurate device and is PIEZO-RM
type sensor calibrated to operate over 750 -
1100 mbar range only.
For low power operation the SDI-12
version sensor is the best solution. The RS-485
version sensors are ideally suited to
A same simple command structure is used to start a measurement and obtain a value on both the SDI-12
and 485 networks.
The images above show the standard range of precision digital barometer modules available from Keynes Controls. All of the sensors read barometric and temperature levels internally and report data in engineering units across a digital network.
Both of the Barom-
The PIEZO-
For low power operation the SDI-
A same simple command structure is used to start a measurement and obtain a value on both the SDI-
Barometric Pressure
Min
Typical
Max
Units
Resolution
0.1
mbar
Range
750 -
1100
mbar
Absolute Pressure
Accuracy
p =750 .. 1100 mbar
at
25 oC
-1.5
1.5
mbar
Pressure Long term
stability
12 months
1
mbar
Temperature
Resolution
0.1 Deg software
limited
Accuracy
20 oC
-40
to 85
-
-0.8
-2
0.8
2
2
Deg C
Deg C
Deg C
Operating Range
-40
to 85
Deg C
Power Supply
Idle mode
Active / measurement
Idle mode
Active / measurement
10
12
SDI-12
= 0.5 RS-485
= 1.1
SDI-12
= 2.1 RS-485 = 2.6
SDI-
18
Volts
mA
mA
mA
mA
Physical Dimensions
L = 50.80
W = 38.10
H = 19.05
W = 38.10
H = 19.05
All models
mm
Maximum error of
pressure reading
over the pressure range.
over the pressure range.
Technical
Specifications
The specifications
are correct at
the time of printing. Keynes Controls retain the right to change the
specification without notice.
The Barom-SDI12
and Barom-RS485 models return
barometric pressure in units of mH20 corrected for the standard
atmospheric pressure of 1013.25 millibars.
Vent tube
4.0 mm
4.0 mm
USB media converter
SDI-12
RS-485
SDI-
Optional -
Data Logger/ SCADA System
Laptop computer
SDI-12
Command
aM!
Start measurement
aD0!
Obtain data
a + Press-mbar,
mH20 @ 4 oC
+Temp (Deg C)
RS-485
Command
%aM!
Start measurement
%aD0!
Obtain data
a + Press-mbar,
mH20 @ 4 oC
+Temp (Deg C)
Expansion
Hub
Hub
Barometer
a = Address 0 .. 9
Standard
a .. z Extended
Barometer Commands
Typical
Instrumentation Layout
The image above shows
how simple
it is to create a fully compensated water level recording system with
barometric correction.
The system layout
shown below
enables simple expansion to additional sensors and easy cable
installation.
Fully integrated into
Q-LOG
Data Recording & Display
software
Q-
