Casella CEL Automatic weather station - Manual (Page 22)

Undamped natural
wavelength: 2.2 m
Repeatability: 0.5% FSD
Electrical Angle: 0 - 359° no deadband at North
Output: 0 to 1.8 V DC for 0 to 359° representing a 1 s
rolling average updated 5 times per s
Operating temp: -20°C to +70°C
Stabilisation time: <1 s from power on
Supply Voltage: 6 - 28 V DC (supplied from environmental
case)
Power consumption: Typically 3 mA
9 mA during first 60 s after power on
3.3.2 Wind Direction Sensor - Sensus Channel Configuration
Description Wind Direction
Units degrees
Type Analog
Information Single ended
Gain x 1
No current source
Display Format ###
Polynomial 0, 199
Enabled Yes
Logged Yes
Minimum Limit 0.0
Maximum Limit 360.0
3.4 Global Solar Radiation Sensor
The solarimeter is mounted on the sensor
head cross-arm between the wind speed and
direction sensors.
It measures the intensity of total
global solar radiation received at the earth’s
surface in terms of Watts/m² and responds
to both direct and diffused sunlight received
from the whole hemisphere. Diffused sunlight
continues to reach the earth even when the
sun is obscured behind cloud, and in the
twilight period before sunrise and after sun
set.
The sensor is based upon a silicon
photo detector which is housed within a weather proof, anodised aluminium body
designed for reliable long term operation in outdoor conditions.
3.4.1 Global Solar Radiation Sensor Specification
Part number: 187010B
Spectral range: 0.4 to 1.1 µm
Range: 0 - 2000 W/m²
Sensitivity: Typically 100
µV/W/m²
Response time: <1 s
Cosine response: Typically <10% from normal to 80° of normal
Operating temp: -40°C to +80°C
Supply voltage: Passive device, no supply is required
Standard Sensors
01059
Solar radiation sensor
Page 22 of 34
Automatic Weather Station
Assembly & Commissioning Handbook