Casella CEL Campbell Stokes Sunshine recorder - Manual

October 2000 CAMPBELL STOKES SUNSHINE RECORDER
User Instructions
Side 5 CAMPBELL STOKES SUNSHINE RECORDER
User Instructions
Side 6
Holes will be found at one end of the bowl
and a tapered pin attached to a chain to fit
them. This is to enable the card to be pierced
and positively located in place, as in some
regions birds peck at the cards and move
them.
7. EVALUATION
Depending on the curved card in use, the
hourly division varies in width from the top to
bottom. Therefore care must be taken when
measuring the length of a burn.
To help calculate the length of a trace when it
has been interrupted, a template is available,
M114041. Made from transparent plastic, it
has two different grids printed on it, one with
parallel sides at the same spacing as the hour
lines on a straight card. The other grid has
tapered sides with the same spacing as the
hour lines on the curved recording card.
Each grid is sub-divided into 10 equal divisions
as shown in Figure 6.
1. Place the template over the recording card
using the appropriate grid, aligning it with
the hour lines.
2. Count the number of divisions from the
hour line to the end of the burn, one
division equals 6 minutes.
3. Add the length of the burns together to
achieve the duration for one day.
4. Alternatively take a sheet of paper.
5. Lay the edge along the trace and mark its
start and end points.
6. Move the sheet
along to the next
trace.
7. Align the end of the
first burn with the
beginning of the
next and mark its
length.
8. Repeat this until you
have noted the
length of all the
burns.
9. Lay the edge of the
paper along the sun
card the same distance from the edge as
the burn.
10. Starting from a convenient hour line, the
total distance will give the duration of
sunshine for one day. See Figure 7.
When the record has been made by a
midsummer sun, the burn will spread, but in
midwinter or in a haze it may only be just
recognizable.
FOR USE WITH
STRAIGHT CARDS FOR USE WITH
CURVED CARDS
Figure 6: Grids on template M114041
In the former case, the end of the
burn is taken to lie halfway
between the centre and the
extreme edge of the curved end of
the burn, but in the latter case, it
should be measured from the
extreme end. See Figure 8.
BURN 1
TOTAL DURATION
BURN 2
8. SERVICING
The instrument is virtually maintenance free,
regular checks of the trace as described
earlier are recommended. Keep the sphere
clean using a non-scratching cloth, and
remove any debris, frost from the grooves of
the bowl.
CASELLA CEL's in house service department
offers a comprehensive range of repair and
calibration services, designed to effect a fast
and efficient back up for all our products. The
service department is operated under the
scope of our BSI registration for products
manufactured by us. We will however,
undertake the repair of other manufactures
equipment.
For further information please contact the
service department at our Bedford
headquarters. We will be happy to provide
quotations for individual repairs or provide
annual maintenance under contract.
CASELLA CEL LIMITED
Regent House
Wolseley Road
Kempston
Bedford
MK42 7JY
Telephone: +44 (0) 1234 844 100
Facsimile: +44 (0) 1234 841 490
E-mail: [email protected]
Webpage: http://www.casella.co.uk
9. TECHNICAL INFORMATION
9.1 Specification
Adjustment for latitude: 0 to 65 o N or S after selecting correct model
Sphere: 101.6 mm dia (±1.3 mm)
Focal length for Sodium D light: 74.9 mm ±0.25 mm
Dimensions: 240 x 187 x 165 mm
Weight: 4.3 kg
9.2 Ordering Information
Tropical - for latitude 0 to 45 o N or S (cards not included): 102271D
Temperate - for latitude 45 to 65 o N or S (cards not included): 102270D
9.3 Accessories And Spares
One years supply of cards (BMO pattern) for use in latitudes up to 65 o N or S: M107901
200 summer cards (No 6730) long curved
200 winter cards (No 6731) short curved
100 equinoctial cards (No 6732) straight
Transparent template for measuring length of trace: M114041
ALTERATION WITHOUT NOTICE
The contents of this manual are subject to change without notice. Figure 7: Total interrupted burns for one day
MIDSUMMER MIDWINTER
Figure 8: Where to measure burns
SUNSHINE RECORDERS
CAMPBELL STOKES PATTERN
User Instructions
HB3190-04
COPYRIGHT
The copyright in this document is vested in CASELLA CEL LIMITED. The contents of this
document must not be used for purposes other than for which it has been supplied or reproduced
or disclosed wholly or in part without the prior written permission of
CASELLA CEL LIMITED.
1. INTRODUCTION
The Casella Campbell Stokes Sunshine
Recorder is manufactured to a design based
on British Meteorological Office (BMO)
specifications. It is designed to measure the
duration of visible sunshine for one day and
uses the intensity of the Sun's rays to burn a
trace on to a recording card.
The instrument measures only the duration of
sunshine, for intensity measurements you
would require a solarimeter.
The sphere is made from well-annealed
optical glass and the card on which sunshine
hours are recorded is inserted into the base of
the unit. Each card is marked with hourly
intervals and an optional transparent plastic
template is also available to help measure the
curved trace more accurately.
The instrument is fully adjustable for operation
at different geographical latitudes and levelling
screws on the base ease installation.
Two versions of the sunshine recorder are
available, depending upon latitude, please see
‘Ordering Information’ for more details.