Delta-T Devices SPN1-MS1 Instruction Sheet page 2

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.
Overall accuracy: Total ±5% Daily integrals
(Global) radiation and
±5% ±10 W.m
Diffuse radiation
±8% ±10 W.m
Resolution 0.6 W.m
Range 0 to >2000 W.m
Analogue output sensitivity 1mV = 1 W.m
Analogue output range 0-2500mV
Sunshine status threshold 200 W.m
Other specifications
±10% sun hours
Accuracy: Sunshine status
with respect to the threshold
±2% of incoming radiation
Accuracy: Cosine Correction
over 0-90° Zenith angle
± 5% over 360° rotation
Accuracy: Azimuth angle
± 0.02 % /°C typical
Temperature coefficient
Temperature range -20 to + 70°C
Stability Recalibrate every 2 years.
Response time < 200ms
Spectral Response 400-2700nm
Spectral sensitivity 10% typical
Non-linearity <1%
Tilt response negligible
Zero Offsets < 3W.m
in ambient temperature.
<3 W.m
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 -20°C at 0 m/s wind speed
temperatures -10°C at 2 m/s wind speed
(using internal heater)
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.
All manuals and user guides at all-guides.com
-2
Hourly averages
-2
individual readings
-2
= 0.6mV
-2
-2
-2
in the direct beam
-2
for a change of 5°C/hour
-2
dark reading
128 Low Road, Burwell, Cambridge,CB25 0EJ, UK
SPN 1 Sp ectral resp onse
120
100
80
60
40
20
0
0 500 1000 1500 20 00
W avelengt h nm
Spectral response of the Sunshine Pyranometer
(thermopile, diffusers and dome combined),
shown with the solar spectrum at ground level.
S P N 1 C o s in e r e s p o n s e
1 .2
1 .1
1
0 .9
0 .8
0 .7
0 .6
0 .5
0 .4
0 .3
0 .2
0 .1
0
0 1 0 20 3 0 40 50 6 0 70
Ze nit h a ng le ( deg r ee s)
Typical cosine response of the Sunshine Pyranometer
compared to the ideal cosine curve.
The upper curve shows the relative accuracy.
Delta-T Devices Ltd
Tel: +44 1638 742922 Fax: +44 1638 743155
email: sales@delta-t.co.uk
0.4
0.35
0.3
0.25
Solar
0.2
SP N1
0.15
0.1
0.05
0
2500 3000
Ide al c osine
A bs olu te outpu t
Relative er r or
2 % limits
8 0 90
web: www.delta-t.co.uk