Campbell Scientific CS140 Instruction Manual
CS140
Background
Luminance Sensor
Revision:
Copyright ©
Campbell Scientific, Inc.
11/20
2013 – 2020
About this manual
Some useful conversion factors:
Area: 1 in
Length: 1 in. (inch) = 25.4 mm
2
(square inch) = 645 mm2
1 ft (foot) = 304.8 mm
1 yard = 0.914 m
1 mile = 1.609 km
Mass:
Pressure: 1 psi (lb/in
Volume: 1 UK pint = 568.3 ml
1 oz. (ounce) = 28.35 g
1 lb (pound weight) = 0.454 kg
2
) = 68.95 mb
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
Recycling information
At the end of this product’s life it should not be put in commercial or domestic refuse
but sent for recycling. Any batteries contained within the product or used during the
products life should be removed from the product and also be sent to an appropriate
recycling facility.
Campbell Scientific Ltd can advise on the recycling of the equipment and in some cases
arrange collection and the correct disposal of it, although charges may apply for some
items or territories.
For further advice or support, please contact Campbell Scientific Ltd, or your local agent.
Campbell Scientific Ltd, Campbell Park, 80 Hathern Road, Shepshed, Loughborough, LE12 9GX, UK
Tel: +44 (0) 1509 601141 Fax: +44 (0) 1509 270924
Email: support@campbellsci.co.uk
www.campbellsci.co.uk
Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.
Section 1. General Information ...................................... 1
1.1 General Safety ............................................................................................ 1
1.2 Sensor Unit Safety ...................................................................................... 1
1.3 Recommended Tools .................................................................................. 1
Section 2. Product Overview ......................................... 2
2.1 Introduction ............................................................................................... 2
2.2 Specifications ............................................................................................ 3
2.2.1 Optical Specifications ..................................................................... 3
2.2.2 Electrical Specifications .................................................................. 3
2.2.3 Communications Specifications ...................................................... 3
2.2.4 Environmental Specifications ......................................................... 4
2.2.5 CS140CAL Calibrator Specifications ............................................. 4
Section 3. Mechanical Specifications ........................... 5
3.1 Dimensions ............................................................................................... 5
3.2 Weights ..................................................................................................... 5
Section 4. Installation ..................................................... 5
4.1 Location and Orientation .......................................................................... 5
4.2 Grounding ................................................................................................. 6
4.3 Mounting the CS140 ................................................................................. 6
4.4 Connectors ................................................................................................ 7
4.5 Wiring Using Supplied Campbell Scientific Cables ................................. 8
4.6 Maintenance cable .................................................................................... 9
4.7 Storage Information ................................................................................ 10
Section 5. Messages .................................................... 10
5.1 Message structure.................................................................................... 10
Section 6. Interface methods ....................................... 13
6.1 Command line/menu ............................................................................... 13
6.2 Configuring a PC for talking to the CS140 ............................................. 13
6.3 Definition of the variables that can be set by the user on the CS140
with the command line interface .......................................................... 14
6.4 Command line mode ............................................................................... 15
6.4.1 The SET Command....................................................................... 15
6.4.2 The SETNC Command ................................................................. 16
6.4.3 The GET Command ................................................................ ...... 16
6.4.4 The POLL command – Polling the CS140 .................................... 18
6.5 The CS140 menu system ................................................................ ......... 18
Section 7. Calibrating the CS140 ................................. 23
i
Section 8. Performing an OS update ........................... 25
Section 9. Maintenance ................................................ 27
9.1 General.................................................................................................... 27
9.2 Cleaning .................................................................................................. 27
Appendix
A. Example C code of the CCITT CRC .................... A-1
B. Example CRBasic programs .............................. B-1
Figures
2-1. CS140 Background Luminance sensor .................................................... 2
4-1. Mounting the CS140 onto a pole ............................................................. 6
4-2. Connector layout ..................................................................................... 7
4-3. Connector pin-outs .................................................................................. 8
4-4. Cable Connections ................................................................................... 9
4-5. CS140 Maintenance Cable ...................................................................... 9
7-1. CS140 Calibrator ................................................................................... 23
7-2. CS140 Calibrator Connections .............................................................. 24
8-1. CS140 DevConfig OS download instructions ....................................... 23
8-2. CS140 DevConfig screen when OS update is complete ........................ 23
ii
CS140 Background Luminance Sensor
WARNING
CAUTION
NOTE
CAUTION
1. General Information
1.1 General Safety
This manual provides important safety considerations for the installation,
operation and maintenance of the CS140. These safety considerations are
classified into three levels:
Warnings alert the installer or user to serious hazards.
Ignoring these warnings could result in injury or death
and/or irrevocable damage to the sensor unit.
Cautions warn of potential hazards. Ignoring these cautions
could result in the sensor being damaged and data being lost.
Notes highlight useful information in the installation, use and
maintenance of this product. These should be followed carefully in
order to gain the maximum benefit from the use of this product.
1.2 Sensor Unit Safety
The CS140 sensor has been checked for safety before leaving the factory and
contains no internally replaceable or modifiable parts.
Do not modify the CS140 unit. Such modifications will
lead to damage of the unit.
1.3 Recommended Tools
The following tools are recommended for installation:
10 mm open spanner/wrench (for grounding boss, must be open)
13 mm spanner/wrench
1
CS140 Background Luminance Sensor
2
2. Product Overview
2.1 Introduction
Figure 2-1. CS140 Background Luminance sensor
The CS140 Background Luminance Sensor accurately measures background
luminance over a wide range from 0 cd/m2, to a maximum of 45,000 cd/m2.
It uses a photodiode with a spectral response close to the CIE human eye model and
removes any unwanted wavelengths via an inbuilt band-pass filter.
The CS140 features a fixed 6˚ field of view as specified by the FAA. For easy
installation the CS140 is simply mounted horizontally with the required 6˚ inclination
being built into the design. (Other angles are possible via the sensors mounting
bracket).
A heated hood will prevent ice and snow from building up, dew heaters will prevent
condensation on the glass window and a dirty window detection system measures
window contamination.
The design is undamaged when pointed directly at the sun allowing complete
flexibility in orientation and it has a rugged IP66 rated environmental enclosure that
protects it from the harshest conditions and will measure the atmosphere with high
stability and repeatability.
Instruction Manual
3
2.2 Specifications
2.2.1 Optical Specifications
Accuracy
±0.2 cd/m2 < 2 cd/m2, ±10% > 2 cd/m2
Field of view
6°
Spectral response
CIE 1931
Measurement range
0-45,000 cd/m2
Resolution
0.1 cd/m2
2.2.2 Electrical Specifications
Minimum Value
Nominal Value
Maximum value
Main power supply for DSP and dew heater
Power supply, DC only
9V
12V
30V
Current consumption sampling continuously
with dew heater active (at 12V)
5 mA
90 mA
7 mA
95 mA
9 mA
100 mA
Hood heater power supply
Hood heater voltage (AC or DC)
24V
30V
Hood heater power (at 24V AC or DC)
48W
55W
2.2.3 Communications Specifications
Serial setting 8N1
Supported data rates
1200 baud
2400 baud
9600 baud
19200 baud
38400 baud - default
57600 baud
115200 baud
Supported formats
RS-232 (full duplex, no hardware handshaking)
RS-485 (half duplex only)
CS140 Background Luminance Sensor
4
Signal voltage levels
Minimum
Value
Nominal
Value
Maximum
Value
RS-232 Communications
RS-232 input threshold Low
0.8V
1.5V
-
RS-232 input threshold High
-
2.0V
2.4V
RS-232 input absolute maximum
-15V
-
+15V
RS-232 input resistance
12kΩ - -
RS-232 output voltage low
- - 0.4V
RS-232 output voltage high (into 3KΩ)
4.4V - -
RS-485 Communications
RS-485 input threshold voltage
-0.2V
-
+0.2V
RS-485 output (Unloaded)
- - 5V
RS-485 output (Load 50Ω)
2V - -
Maximum voltage at any terminal
-7V
-
+7V
2.2.4 Environmental Specifications
Minimum Value
Nominal Value
Maximum value
Sensor temperature ranges
Operating temperature
-25°C
-
+60°C
Extended operating temperature
-40°C
+70°C
(1)
Storage temperature
-40°C
-
+85°C
Sensor humidity range
Operating humidity range
0%
-
100%
Sensor heater thresholds
Dew heater turn on
-
<35°C
-
Dew heater turn off
-
>40°C
-
Hood heater turn on
-
<5°C
-
Hood heater turn off
-
>15°C
-
(1) Extended temperature ranges are only guaranteed if the sensor has been tested by Campbell Scientific and verified over this
temperature range.
Ingress protection
IP66
2.2.5 CS140CAL Calibrator Specifications
A field calibration device, the CS140CAL, is available. Specifications as below.
Temperature range
0 – 40°C
Calibration value
4,500 cd/m2
Accuracy
+/- 6%
Ingress protection
IP52
Communication1
RS-232, 38400 bd
Dimensions (excluding cables)
72 mm long x 46 mm diameter
Weight
300 g
1
Connecting the CS140CAL to a CS140 forces communications to RS-232, 38400 bd and also forces the sensor ID to ‘0’.
Instruction Manual
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3. Mechanical Specifications
3.1 Dimensions
3.2 Weights
Sensor weight 2.4 kg
Shipping weight 3.5 kg
4. Installation
4.1 Location and Orientation
The CS140 measures environmental variables and is designed to be located in harsh
weather conditions. However there are a few considerations to take into account if
accurate and representative data from a site are to be obtained.
In order to reduce the service frequency with the unit, the CS140 should, if possible,
be placed away from sources of contamination. More regular maintenance will be
required when the instrument is placed in areas where contamination is unavoidable
or where measurements may be safety related.
The CS140 can be orientated in any direction required by local practice and it is not
damaged by sunlight shining directly into it. It should not be pointed at a source of
bright light that may be unrepresentative. Although of course its readings will not be
accurate in these circumstances. Note that with the sensor horizontal the centre of the
field of view is actually 6 degrees above horizontal. The mounting bracket allows
adjustment by +/- 12° if the mast is not vertical or if it is necessary to elevate the field
of view at an angle other than 6°.
CS140 Background Luminance Sensor
6
4.2 Grounding
The CS140 must be properly grounded by taking a ground wire with a minimum
cross sectional area of 6 mm2 and maximum length of 5 m from the brass grounding
lug at the rear of the unit to an adequate grounding point. The pole and foundations of
a pole mounted installation will provide some basic lightning protection and
protection against radio frequency interference and should also be correctly grounded.
4.3 Mounting the CS140
A pole mounting kit is supplied with the CS140. This kit includes a mounting plate,
two V-bolts and suitable bolts for clamping the pole between the plate and brackets.
To mount the CS140 onto a pole:
1. The mounting plate is supplied ready fixed to the CS140. Offer up the plate to the
pole and present the brackets and bolts from the other side of the pole to fit into
the matching holes of the plate as shown in Figure 4-1.
Figure 4-1. Mounting the CS140 onto a pole
2. Clamp the pole between the plate and brackets by tightening using the nuts
provided.
The machine screws A and B in Figure 4-1 are used to level the CS140. Screw A is
used to lock the CS140 at the right elevation with screw B acting as a pivot. Usually
this will be with the hood horizontal which gives a field of view elevated by 6
degrees.
Instruction Manual
7
Take care not to overtighten the nuts on the bolts as it may be possible to distort and/or damage the brackets by doing so, and/or the nuts may seize up. Only tighten
the nuts to a degree necessary to hold the CS140 firmly in place.
Where the CS140 is to be mounted onto another type of mast, please refer to the
manual for that mast for mounting details.
Do not reposition, once fixings are tightened, by forcing the unit as this can cause
damage.
4.4 Connectors
The CS140 has two connectors. One is for communications and the sensor power
supply and one provides power to the hood heater.
Figure 4-3 shows the pin-outs of the sockets viewed from outside. Colours shown are
the colours of the cores in the supplied cables.
Figure 4-2. Connector layout
CS140 Background Luminance Sensor
CAUTION
CAUTION
Figure 4-3. Connector pin-outs
4.5 Wiring Using Supplied Campbell Scientific Cables
Two cables are supplied, each 5 m long. One is for communications and the sensor
power supply, the other is for the hood heater.
If the power cable is incorrectly wired to the CS140 then
irrevocable damage can be done to the unit.
The communications cable is terminated at one end with a 9 pin D-connector (DB9).
The D-connector can be connected directly to a PC or data logger such as the
Campbell Scientific CR1000 using a suitable interconnecting cable such as the
SC110. If another type of connection is required then the D-connector can be easily
removed.
10 m is the longest length of cable recommended. In
particular additional RS-485 cable should be twisted pair.
Please contact Campbell Scientific if you wish to use a longer
length of cable.
8
4.6 Maintenance cable
Instruction Manual
Figure 4-4. Cable Connections
A maintenance cable is available from Campbell Scientific that will force
communications to RS-232 38400 baud, and sensor id “0”.
The cable has connectors allowing it to be put in between the CS140 and the existing
connection and a 5 m flying lead with a 9-way D connector for RS-232
communication. The sensor will continue to draw power from the existing source.
When installed, the existing communication path is disconnected and communication
via the flying lead is forced to RS-232, 38400 bd with a sensor ID of “0”.
When it is removed and replaced with the cable previously used the baud rate and ID
will return to those previously set.
Figure 4-5. CS140 Maintenance Cable
9
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