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R3-50, R3-100 and R3A-100 Doc. No 1210-PS-0015 Issue 2 June 2021
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Page 29
12 USING ANALOGUE INPUTS WITH SENSOR INPUT
UNIT PART 1210-PK-016
Introduction
The Sensor Input Unit allows the user to integrate up to 6 analogue inputs into the R3 digital string,
together with a PRT input. It is designed for outdoor use, please see section 13.3 for mounting
details.
12.1 Analogue Inputs
The optional Sensor Input Unit provides six differential analogue inputs of 14 bit resolution. A
specification for these is given in section 6. This feature allows the user to power extra equipment
local to the Sensor Input Unit and to take analogue data from that equipment. The anemometer
digitises the analogue data and appends it to the digital data string
A sensor supply voltage is available at each connector. The voltage at this connector is the supply
voltage
at the SIU minus 1.5 volts. The sensor supply voltage is internally regulated to 21±2 volts
for SIU supply voltages above 22 volts.
For sensors with a common supply and signal ground, this ground should be connected to Sensor
Supply -. In this situation Analogue Input - should be connected to Sensor Supply - and Analogue
Ground left floating.
The
total current drawn from the sensor supply by all the external sensors must not exceed 70mA.
Sensor connector pin out:
1
Sensor power -
2 Analogue input 1+ / 3+ / 5+
3 Analogue ground
4 Analogue input 1- / 3- / 5-
5 Analogue input 2+ / 4+ / 6+
6 Analogue input 2- / 4- / 6-
7 Sensor power +
8 Chassis/screen