Vaisala RSA921 Technical data

Vaisala Ozone Interface Kit RSA921

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Features / Beneﬁts

Built around Vaisala Digital

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Interface OIF92

Four-channel digital interface

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for connecting digital Vaisala Radiosonde RS92 models to ECC-type ozone sensors for ozone sounding

Enables accurate

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measurements, sharp vertical resolution and a fast sampling rate

Can be used for 1-2 other

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sensor measurements within speciﬁed ranges

The Vaisala Ozone Interface Kit RSA921, featuring the Vaisala Digital Interface OIF92, is used for ozone sounding with the digital versions of the Vaisala Radiosonde RS92 and an ECC-type ozone sensor (Science Pump Corporation model ECC-6A or EN-SCI Corporation model Z). The OIF92 is powered by the radiosonde battery and has four channels. Two channels are dedicated to the ozone sensor current and temperature. Two channels are dedicated to voltage measurement for other purposes.

With the OIF92, an ECC-type ozone sensor and a digital RS92 radiosonde it is possible to measure humidity, pressure, temperature and geopotential height while

measuring the vertical distribution of atmospheric ozone. Winds in the upper atmosphere are detected using GPS navigation signals.

Ground equipment

The OIF92 and digital RS92 radiosondes are used with the Vaisala DigiCORA® Sounding System MW31. The ozone data is stored to le for further processing by the user. It is easy to perform simulations and post-ascent processing with the METGRAPH module of the DigiCOR A® Sounding Software. System maintenance can be performed by Vaisala under the terms of a Vaisala Service Contract.

Technical data

Digital Interface OIF92

For use with Science Pump Corporation ECC-6A

ozone sensor and

EN-SCI Corporation Model Z ozone sensor Dimensions 40 (l) x 35 (w) mm Cable length 380 mm Weight with cable Max. 20 g Number of analog input channels 4 Analog-to-digital converter resolution 16-bit Measurement temperature range for all channels -5 ... +60 °C Operating temperature range for all channels - 40 ... +85 °C Sampling rate for all channels Dependent upon the

radiosonde:

e.g. once per second with the RS92-SGP

Synchronization All channels are measured in synchronization

with the meteorological measurements

(pressure, temperature, humidity, wind)

Ozone current measurement range 0 ... 20 µA

Ozone current measurement uncertainty *)

0.05% of the reading, minimum 1 nA

Accuracy examples: – for 5 µA measurement the accuracy is 2.5 nA – for 10 µA measurement the accuracy is 5 nA – for 20 µA measurement the accuracy is 10 nA Resolution 1 nA (LSB = 0.35 nA) Typical noise 1 nA (standard deviation) Ozone temperature measurement range -5 ... +60 °C Temperature measurement uncertainty*) ±0.2 °C Temperature resolution 0.01 °C Typical noise 0.015 °C (standard deviation) Voltage measurement range (both voltage channels) 0 ... 8 V Voltage measurement uncertainty*) 0.1 % of the reading,

minimum 1 mV

Resolution 1 mV (LSB = 0.13 mV) Typical noise 0.5 mV (standard deviation) Input resistance 20 kΩ Power consumption < 3 mA (from radiosonde battery)

* 2-sigma (k=2) conﬁdence level (95.5 %)

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

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