Maintenance
Keep the glass dome clean using clean water, with mild detergent or Isopropyl Alcohol for difficult deposits.
If any two of the three blue desiccant indicators turn pink - unscrew the desiccant capsule from the indicator cap,
and replace with a fresh one (type SPN1-SD). Recalibration every 2 years is recommended.
SPN1-MS1 Specifications
The following accuracy figures give 95% confidence limits, i.e. 95% of individual readings will be within the stated
limits under normal climatic conditions.
Spectral response of the Sunshine Pyranometer
(thermopile, diffusers and dome combined),
shown with the solar spectrum at ground level.
SPN 1 Sp ectral resp onse
0
20
40
60
80
100
120
0
500
1000
1500
20 00
2500
3000
W avelength nm
rel
at
ive co
n
tr
ib
u
ti
o
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
Solar
SP N1
Overall accuracy: Total
(Global) radiation and
Diffuse radiation
±
5% Daily integrals
±
5%
±
10 W.m
-2
Hourly averages
±
8%
±
10 W.m
-2
individual readings
Resolution 0.6
W.m
-2
= 0.6mV
Range
0 to >2000 W.m
-2
Analogue output sensitivity
1mV = 1 W.m
-2
Analogue output range
0-2500mV
Sunshine status threshold
200 W.m
-2
in the direct beam
Other specifications
Accuracy: Sunshine status
±
10% sun hours
with respect to the threshold
Accuracy: Cosine Correction
±
2% of incoming radiation
over 0-90° Zenith angle
Accuracy: Azimuth angle
±
5% over 360
°
rotation
Temperature coefficient
±
0.02 % /
°
C typical
Temperature range
-20 to + 70
°
C
Stability
Recalibrate every 2 years.
Typical cosine response of the Sunshine Pyranometer
compared to the ideal cosine curve.
The upper curve shows the relative accuracy.
S P N 1 C o sin e re sp o n s e
0
0 .1
0 .2
0 .3
0 .4
0 .5
0 .6
0 .7
0 .8
0 .9
1
1 .1
1 .2
0
1 0
20
3 0
40
50
6 0
70
8 0
90
Ze nith a ng le (deg ree s)
Ide al c osine
A bs olu te outpu t
Relative error
2 % limits
Response time
< 200ms
Spectral Response
400-2700nm
Spectral sensitivity
10% typical
Non-linearity <1%
Tilt response
negligible
Zero Offsets
< 3W.m
-2
for a change of 5
°
C/hour
in ambient temperature.
<3 W.m
-2
dark reading
Latitude capability
-90° to + 90
°
Environmental: Sealing
IP67
Sunshine status output
No sun = open circuit
Sun = short circuit to ground
Power requirement
2mA (excluding heater power),
5V – 15V DC
Heater power
12V – 15V DC, up to 1.5 A
Heater control
Continuously variable up to 20W
output for external temperatures
below 0°C
Lowest snow & ice-free
temperatures
(using internal heater)
-20
°
C at 0 m/s wind speed
-10
°
C at 2 m/s wind speed
Mounting options:
3 x M5 tapped holes in base;
108mm pcd, 120°spacing
Size & Weight
140mm dia x 100mm high, 786 gm
Notices
Patents
: The SPN1 Sunshine Pyranometer is protected by patents EP1012633 & US 6417500.
EMC certification
: available on request.
Delta-T Devices Ltd
128 Low Road, Burwell, Cambridge,CB25 0EJ, UK
Tel: +44 1638 742922 Fax: +44 1638 743155
email:
web:
www.delta-t.co.uk
All manuals and user guides at all-guides.com
