1
MODEL 61202L
BAROMETRIC PRESSURE SENSOR
INSTRUCTION SHEET 61202-90
REV 10-01
1.0 SPECIFICATIONS
Pressure
600 to 1100 hPa standard range
Digital Resolution
0.1 hPa
Operating Temperature
-50 to +60 °C
A c c u r a c y
±0.3 hPa at 20 °C
±1 hPa at -50 to +60 °C
Update Rate
2 seconds
Serial Output
Full duplex RS-232
Half duplex RS-485
9600 baud
Polled or continuous
ASCII text output
Analog Outputs
4.00 to 20.00 mA
Standard range 600 to 1100 hPa
Other ranges user settable
Analog Resolution
Depends on range
0.1 hPa typical
Power
7 to 30 VDC at 30mA
Case
Fiber-reinforced Thermoplastic
Weight
Net 1 lb 5 oz
Shipping 4 lb
2.0 INTRODUCTION
MODEL 61202 Barometric Pressure Sensor is a versatile
electronic barometer featuring high accuracy, low power,
wide operating temperature range, and calibrated outputs in
several formats.
Low power consumption and wide temperature range make
the 61202 ideal for remote applications using battery or solar
power. Accuracy better than ±1 hPa is maintained over the
entire pressure and temperature ranges.
All models include full duplex RS-232 and half duplex RS-485
serial connections. Model 61202L is configured for 4-20mA
output.
The standard pressure scale for analog outputs spans 600
to 1100 hPa. A narrower range may be selected via soft-
ware menu. Serial outputs run in continuous or polled modes.
In polled mode, a network of up to 32 sensors may be
individually addressed.
3.0 INSTALLATION
The 61202 may be mounted to a mast or panel. Always
mount the barometer so the cable exit faces down. For mast
mount, use the V-block and U-bolts. For panel mount, remove
the V-block and U-bolts to exposes holes in the mounting
plate.
To access electrical connections, remove the 61202 top
cover. Loosen the nut on the weather-proof strain relief on
the bottom of the case. Run cables through the nut and
strain relief opening. Connect wires to the labeled terminals
on the circuit board as shown in attached WIRING DIAGRAM.
Place jumpers at J1 to select RS-232, RS-485, or analog
output. Finger-tighten the strain relief nut and replace the
cover.
When installed outdoors, we recommend using the barometer
with a Young Model 61002 Pressure Port to minimize
pressure errors caused by wind flow over the barometer
inlet.
3.1 JUMPER SETTINGS
Jumper J1 selects the data output format (Voltage, 4-20mA,
RS232 or RS485). Jumper J2 selects other parameters such
as (B) POLLED/CONTINOUS, (C) 50/60 Hz noise reduction.
Refer to wiring diagram for specific jumper settings.
4.0 OPERATION
Operation begins 3 seconds after power is applied. Outputs
are updated once every 2 seconds.
4.1 ANALOG OUTPUT
Be sure jumper J1 is in the IOUT (factory default) position .
Standard current output range is 4.00 to 20.00 mA full scale
for 600 to 1100 hPa (0.0032 mA per 0.1 hPa).
Other pressure ranges within the 600 to 1100 hPa span may
be selected via software commands but the full scale output
signal range will always be the same, 4-20 mA. See SOFT-
WARE COMMANDS for details.
4.2 SERIAL OUTPUT
The baud rate is 9600. Serial output may be set to CONTINU-
OUS (factorydefault) or POLLED mode using jumper J2. All
serial output is numeric ASCII text representing pressure in
hPa. Each string is terminated with a CR (ASCII 13). Example:
0983.9
0983.9
0983.9
0983.9
In CONTINUOUS mode, serial data is automatically sent once
every 2 seconds.
In POLLED mode, the unit sends data only after receiving a
poll command. The poll command is Ma! where a is the
address. The default address is 0 (ASCII 48). Upon receiving
a properly addressed poll command, the unit sends data at
the next available 2-second output interval.
61202 Barometer mounted on mast.
Barometer shown with
61002 Pressure Port
Содержание 61202L
Страница 4: ......
