Campbell Scientific LI200S-L User Manual

INSTRUCTION MANUAL

LI200S Pyranometer

Revision: 2/96

Copyright (c) 1981-1996

Campbell Scientific, Inc.

Warranty and Assistance

The LI200S SENSOR is warranted by CAMPBELL SCIENTIFIC, INC. to be
free from defects in materials and workmanship under normal use and service
for twelve (12) months from date of shipment unless specified otherwise.
Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation
under this warranty is limited to repairing or replacing (at CAMPBELL
SCIENTIFIC, INC.'s option) defective products. The customer shall assume
all costs of removing, reinstalling, and shipping defective products to
CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will
return such products by surface carrier prepaid. This warranty shall not apply
to any CAMPBELL SCIENTIFIC, INC. products which have been subjected
to modification, misuse, neglect, accidents of nature, or shipping damage. This
warranty is in lieu of all other warranties, expressed or implied, including
warranties of merchantability or fitness for a particular purpose. CAMPBELL
SCIENTIFIC, INC. is not liable for special, indirect, incidental, or
consequential damages.

Products may not be returned without prior authorization. The following

act information is for US and International customers residing in countries

cont
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone [phone]. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:

CAMPBELL SCIENTIFIC, INC.

RMA#_____
815 W
Logan, Ut

CAMPBELL SCIENTIFIC, INC. does not accept collect calls.

est 1800 North

ah 84321-1784

LI200S PYRANOMETER

1. GENERAL

This manual provides information for interfacing
a CR10, 21X, and CR7 datalogger to a LI200S
Pyranometer. An instruction manual provided
by LI-COR contains the sensor calibration
constant and serial number. Cross check this
serial number against the serial number on your
LI200S to ensure that the given calibration
constant corresponds to your sensor.

2. SPECIFICATIONS

Stability: <±2% change over a 1 year

period
Response Time: 10 µs
Temperature

Dependence: 0.15% per °C maximum
Cosine Correction: Cosine corrected up to 80°

angle of incidence
Operating

Temperature: -40 to 65°C
Relative Humidity: 0 to 100%
Detector: High stability silicon

photovoltaic detector (blue

enhanced)
Sensor Housing: Weatherproof anodized

aluminum case with acrylic

diffuser and stainless steel

hardware
Size: 0.94” dia x 1.00” H (2.38 x

2.54 cm);
Weight: 1 oz. (28 g)
Accuracy: Absolute error in natural

daylight is ±5% maximum;

±3% typical
Typical Sensitivity: 0.2 kWm
Linearity: Maximum deviation of 1%

up to 3000 Wm
Shunt Resistor: Adjustable, 40.2 to 100 Ω,

factory set to give the

above sensitivity
Light Spectrum

Waveband: 400 to 1100 nm

-2mV-1

-2

NOTE: The black outer jacket of the cable
is Santoprene® rubber. This compound was
chosen for its resistance to temperature
extremes, moisture, and UV degradation.
However, this jacket will support
combustion in air. It is rated as slow
burning when tested according to U.L. 94
H.B. and will pass FMVSS302. Local fire
codes may preclude its use inside buildings.

3. MEASUREMENT INSTRUCTION

The LI200S (refer to Figure 1) outputs a low
level voltage ranging from 0 to a maximum of
about 12mV depending on sensor calibration
and radiation level. A differential voltage
measurement (Instruction 2) is recommended
because it has better noise rejection than a
single-ended measurement.

If a differential channel is not available, a single­ended measurement (Instruction 1) is a
possibility. As a test, wire the LI200S as shown in
Figure 2 and make single-ended and differential
measurements. Compare results to determine
the acceptability of a single ended measurement.

NOTE FOR 21X USERS:

potential differences are created along the 21X
analog terminal strip when the datalogger
power supply is powering external peripherals.
If the peripherals draw about 30mA or greater,
the LI200S must be measured differentially.

Figure 1. LI200S Schematic

INPUT RANGE

An example showing how to determine the
optimum input range for a given sensor
calibration and maximum irradiance follows.

This is an example only. Your values will be
different.

Slight ground

1