HD9008T / 9009T serie – Meteorological Temperature and RH Transmitter

HD9008T / 9009T serie – Meteorological Temperature and RH Transmitter

Meteorological temperature transmitter and meteorological temperature and relative humidity transmitter.

The HD9008TRR and HD9009TRR are single block RH and temperature microprocessor transmitters, temperature configurable. The HD9008TRR is a passive transmitter with a 4…20mA output and 10…30Vdc power supply; the HD9009TRR is a transmitter with a 0…1V standard voltage output (other outputs available on demand) and 10…30Vdc power supply. Sensors are mounted at the end of a plastic tube: a capacitive humidity sensor and a Platinum temperature sensor (100Ω @0°C).

The instrument can be reprogrammed by means of a key, and no jumper or potentiometer actions are required. The humidity input can be recalibrated by using two saturated solutions: the first one at 75%, the second one at 33%; the 0%RH…100%RH relative humidity range is fixed, 4mA (or 0Vdc) correspond to 0%RH, 20mA (or 1Vdc) equal 100%RH.
Temperature standard configuration is -40…+80°C, corresponding to 4…20mA and 0…1Vdc, respectively.

The user can configure the temperature output in ranges different from the standard one by means of a Pt100 simulator or of a set of fixed resistances, provided that it is included in the -40°C…+80°C range with a minimum amplitude of 25°C. Two LEDs give alarm indications (temperature exceeding set range, sensor breakage or short-circuit) and help the operator when programming.

An out-of-standard temperature operating range can be requested when placing the order.
Important Warning: probes work in the -40°C…+80°C temperature range. Outside this range data are not correct; electronics is designed to operate in this range.

SENSORS
The humidity sensor is a condenser which dielectric is made up by an hygroscopic polymer. As water dielectric constant is approximately 80, you’ll get a strong change in capacity as the humidity content of this polymer changes. The advantages of this kind of sensor are: good linearity, insensitivity to temperature changes, fast response time and long-lasting life. The sensor temporary looses its accuracy if some condensation develops on its surface (the transmitted value is higher than the real one because of an increase in effective capacity).
The temperature sensor is a Platinum resistance thermometer (100Ω @0°C).
The Pt100 resistance variation is transformed into a current or voltage signal, linear to temperature.

SIGNAL TRANSMISSION
The electronic circuit design provides the signal to increase linearly as humidity and temperature raise.
In presence of cables transmitting high currents or machines causing electromagnetic noises, the transmitter connection cables have to be placed in a separate raceway, or far from them, to prevent these noises. It is recommended
to use a shielded cable for the connections of instruments having a voltage output (HD9009TRR).

Available types in this range:

HD 9007 A-1 12-ring meteorological shield for  transmitter HD 9008TR and  HD9009TR.
HD 9007 A-2 16-ring meteorological shield for transmitter HD 9008TR and HD9009TR, for hot weather.
HD 9008 TRR Configurable dual meteorological temperature and relative humidity transmitter. Measuring range: temperature -40°C…+80°C,  relative humidity 5…98% R.H., 4mA correspond  to –40°C and 0% R.H., 20mA correspond to +80°C and 100%R.H. Probe Ø26 mm, L = 185 mm. Power supply 10…40Vdc. 
HD 9008 TR.1 Dual meteorological temperature and relative humidity transmitter. It measures the temperature with 2wire Pt100 sensor. Measuring range: relative humidity 5…98%R.H., 4mA correspond to 0%R.H., 20mA correspond to 100%R.H. Power supply 10…40Vdc. Probe Ø26 mm L= 185 mm.
HD 9008 TR.2 Dual meteorological temperature and relative humidity transmitter. It measure the temperature with 4wire Pt100 sensor. Measuring range: relative humidity 5…98%R.H., 4mA correspond to 0%R.H., 20mA correspond to 100%R.H. Power supply 10…40Vdc. Probe Ø26 mm L= 185 mm.
HD 9009 TRR Configurable dual meteorological temperature and relative humidity transmitter. Measuring range: temperature -40°C…+80°C, relative humidity 5…98% R.H., 0Vdc correspond to -40°C and 0% R.H., 1Vdc correspond to +80°C and 100%R.H. Probe Ø26 mm, L = 185 mm. Power supply 5…35Vdc, 2mA. 
HD 9009 TR.1 Dual meteorological temperature and relative humidity transmitter. It measures the temperature with 4 wire Pt100 sensor. Measuring range: relative humidity 5…98%R.H., 0Vdc correspond  to 0%R.H., 1Vdc correspond to 100%R.H. Power supply 5…35Vdc, 2mA. Probe Ø26 mm L= 185 mm.
HD 9009 TR.2 Dual meteorological temperature and relative humidity transmitter. It measures the temperature with 4 wire Pt100 sensor. Working range: relative humidity 5…98%R.H., 0Vdc correspond to  0%R.H., 1Vdc correspond to 100%R.H. Power supply 5…35Vdc, 2mA. Probe Ø26 mm L= 185 mm.





SKU: VHD9008T7AC|| VHD9008T7S|| VHD9008T17S|| VHD9008TRR|| VHD9008TR.2|| VHD9009TRR|| VHD9009TR.1|| VHD9009TR.2|| - Need Help? Contact Us Leave Feedback

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