HD9408T_1

HD 9408T BARO, HD 9408TR BARO, HD 9908T BARO – Barometric Transmitters

HD 9408T BARO, HD 9408TR BARO and HD 9908T BARO are analog output electronic
barometers. They use a piezoresistive sensor element which gives extremely accurate
and stable measurement of the atmospheric pressure and assures excellent repeatability,
low hysteresis and very good temperature stability. The output signal of the sensor is
conditioned to provide a voltage or a current output linearly proportional to the barometric
pressure. The transmitters are ready as they have been calibrated at the factory. A zero
adjustments potentiometer is available for offset to station elevation.

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Product Description

HD 9408T BARO, HD 9408TR BARO and HD 9908T BARO are analog output electronic
barometers. They use a piezoresistive sensor element which gives extremely accurate
and stable measurement of the atmospheric pressure and assures excellent repeatability,
low hysteresis and very good temperature stability. The output signal of the sensor is
conditioned to provide a voltage or a current output linearly proportional to the barometric
pressure. The transmitters are ready as they have been calibrated at the factory. A zero
adjustments potentiometer is available for offset to station elevation.
HD9408T BARO requires a continuous dc power supply, its low power consumption
(< 4 mA) makes it ideal for portable and remote battery or solar powered
applications. It is available in different kinds of analog output: 0-1 Vdc, 0-5 Vdc (1-5
Vdc, 1-6 Vdc on request) or 4-20 mA (two wires).

HD 9408TR BARO offers superior temperature performance: the internal circuitry allows
the sensor to work at constant temperature so that it achieves accurate temperature
compensation over the whole range from -40°C to +60°C.
HD 9408TR BARO requires a continuous dc power supply and a differential cabling
connection to achieve best results. It is available in different output versions: 0÷1 Vdc,
0÷5 Vdc (1÷5 Vdc, 1÷6 Vdc on request).
HD 9908T BARO, unlike the other models, is equipped with a display showing the pressure
measurements, an analog output 0÷20 mA, 4÷20 mA, 0÷1 V and 0÷5 V (0÷10 V on request)
confi gurable by the customer and with an ON/OFF relay output with programmable alarm
threshold.
HD 9908T BARO requires a 24 Vac (or 220 Vac on request) power supply.
HD 9408T BARO, HD 9408TR BARO and HD 9908T BARO are low cost and excellent
performance solutions for meteorological applications, environmental monitoring
systems, metrological and environmental data logging, altitude applications, barometric
pressure compensation in the performance of internal combustion engine, cleanroom
barometric pressure compensation, testing of vehicle emissions.
HOUSING AND INSTALLATION
In all models the sensor electronics are housed in a sturdy MACROLON with IP67
protection. Opening the lid holes are available that allow you to secure the base of the
transmitter directly to a panel or a wall. The measurement accuracy is independent of the
position of the transmitter. However, it is advisable to mount the transmitter so that the
sensor is facing down to reduce dust and dirt on the fi lter. If the installation is in an open
environment is recommended to use a special static port to minimize errors caused by
the wind fl ow on the input pressure.
CONNECTION DIAGRAM AND OPERATION
– Make the power connections for the HD 9908T BARO.
– Make the connections for the relay output, the relay contact is free.
– Select the analog output 0÷20 mA, 4÷20 mA, 0÷1 V, 0÷5 V by means of the jumper.
– Switch on the instrument, press the PUSH button and turn the SET trimmer to set the
desired threshold value between 800 and 1100 mbar; the set value is shown on the
LCD display.
– Using the trimmer , set the desired HYS (=hysteresis) value between 5 and 50
mbar.
– The instrument will now indicate the barometric pressure; HI led, LO led or ALARM led
and ALARM relay will switch on if one the following cases occurs (see table 1).
NOTE: the ALARM led comes on to indicate that the relay is energized and the contact
is closed.
– Once installation is completed, check that the cover is tightly closed; the same
applies to the grommets.

ORDERING CODE
HD9408T BARO 800÷1100mbar barometric transmitter output 0÷1Vdc. Upon request
output: 0÷5Vdc, 1÷6Vdc, 4÷20mA. Working temperature range -30°C ÷ +60°C.
HD9408TR BARO 800÷1100mbar barometric transmitter output 0÷1Vdc. Upon request
output 0÷5Vdc, 1÷5Vdc. Temperature working range –40°C ÷ +60°C, heated
sensor
HD9908T BARO 800÷1100mbar digital barometric transmitter with LCD indication.
Outputs: 0÷20mA, 4÷20mA, 0÷1Vdc, 0÷5Vdc. Working temperature range -20°C
÷ +60°C.

Download

Manuals and Brochures here.  

HD9408TBARO.pdf

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