Campbell CS475A Manuel utilisateur

Revision: 06/2020

Campbell Scientific, Inc.

Table of contents

1. Introduction 1

2. Precautions 1

3. Initial inspection 2

4. QuickStart 2

5. Overview 5

5.1 Components and hardware 7

6. Specifications 7

6.1 Radar unit 8

6.2 Environmental 9

6.3 Physical 9

7. Installation 10

7.1 Wiring to data logger 10

7.1.1 Built-in self-test (BIST) 11

7.2 Data logger programming 11

7.2.1 SDI-12 programming 12

7.3 Field installation 12

7.4 Determine and set reference stage 16

8. Operation 17

8.1 Default settings 17

8.2 Configuring sensor using Device Configuration Utility 18

8.3 Updating operating system 20

8.4 Configuring sensor via extended SDI-12 commands and terminal emulator 21

8.5 SDI-12 measurement commands 37

9. Diagnostics, repair, and maintenance 41

9.1 Testing procedure 41

9.2 Cyclic redundancy check 41

9.3 Diagnostics 42

9.4 Maintenance 42

Table of Contents - i

Appendix A. Importing Short Cut code into CRBasic Editor 43

Appendix B. Example programs 44

Appendix C. SDI-12 version 1.4 identify measurement commands and

responses 46

Appendix D. FCC/IC equipment authorization (USA/Canada only) 49

Table of Contents - ii

1. Introduction

The CS475A radar sensor monitors the water level of rivers, lakes, tidal seas, and reservoirs, and is

ideal for areas where submersed sensors can be damaged due to corrosion, contamination,

flood-related debris, lightning, or vandalism. It outputs a digital SDI-12 signal to indicate

distance and stage. All contemporary Campbell Scientific data loggers can read the SDI-12 signal.

NOTE:

This manual provides information only for CRBasic data loggers. The CS475A is also

compatible with many of our retired Edlog data loggers. For Edlog data logger support,

contact Campbell Scientific.

2. Precautions

lREAD AND UNDERSTAND the Safety section at the back of this manual.

lFollow country-specific installation standards, prevailing safety regulations, accident

prevention rules, and this manual’s safety instructions. The sensor is designed for safe

operation in accordance with the current technical, safety, and ANSI standards.

lThe emitting frequencies of the CS475A is well below the internationally permitted limits.

When used correctly, the radar sensor presents no danger to people.

lDo not attempt to install the sensor unless you are qualified to perform the installation.

lHandle the sensor carefully, since it is a precision instrument.

lIf installing the sensor from tall structures over water, use appropriate safety equipment

such as a safety harness or a life preserver when installing or performing maintenance on

the sensor.

lThe user is responsible for ensuring that the sensor is maintained and functioning properly.

CS475A Radar Water Level Sensor 1

3. Initial inspection

When unpacking the equipment, do the following:

lUnpack the unit in a clean, dry area.

lCarefully open the shipping package, ensuring that the cable jacket is not damaged or cut.

Contact Campbell Scientific if the cable was damaged during unpacking.

lInspect the equipment for any damage that occurred during shipping. If equipment was

damaged during shipping, file a claim with the carrier and report the damage in detail.

4. QuickStart

A video that describes data logger programming using Short Cut is available at:

www.campbellsci.com/videos/cr1000x-data logger-getting-started-program-part-3 . Short Cut

is an easy way to program your data logger to measure the sensor and assign data logger wiring

terminals. Short Cut is available as a download on www.campbellsci.com. It is included in

installations of LoggerNet, RTDAQ, PC400, or PC200W.

1. Open Short Cut and click Create New Program.

2. Double-click the data logger model.

3. In the search box under the Available Sensors and Devices heading, start typing CS475A, or

find the sensor in the Sensors >Water >Level & Flow >CS475A Radar Water Level Sensor

folder. Double-click CS475A Radar Water Level Sensor (average stage) or CS475A Radar

Water Level Sensor (stage) (FIGURE 4-1 (p. 3)). The CS475A (stage) measurement issues the

M! command and collects four values (stage, distance, battery voltage at the sensor, and

error codes) (FIGURE 4-2 (p. 3)). The CS475A (average stage) issues the M1! command and

completes a NOAA PORTS measurement; the user must configure the sensor for the

number of measurements included in the average (FIGURE 4-3 (p. 3)).

SDI-12 Address defaults to 0. Enter the correct SDI-12 Address for the radar sensor if it has

been changed from the factory default value. Default units for stage and distance

measurements are in feet. Change the units to Meter if the System Units have been

changed to meters.

CS475A Radar Water Level Sensor 2

NOTE:

Changing the units in Short Cut will NOT change the units in the device or provide any

unit conversions by the data logger. It will only update the units label in the data table.

FIGURE 4-1. Short Cut, Sensor Selection

FIGURE 4-2. Short Cut, CS475A Stage Properties

FIGURE 4-3. Short Cut, CS475A Average Stage Properties

CS475A Radar Water Level Sensor 3

4. Click the Wiring tab to see how the sensor is wired to the data logger. You can change a

wire location by selecting the control terminal (C) (FIGURE 4-4 (p. 4)). Click OK after wiring

the sensor.

FIGURE 4-4. Short Cut, Change Wire Location

CAUTION:

Wire the sensor in this order: white, clear, red, black.

5. Repeat steps three and four for other sensors.

CS475A Radar Water Level Sensor 4

6. In Output Setup, type the scan rate, a Table Name, and Data Output Storage Interval

(FIGURE 4-5 (p. 5)). Click Next.

FIGURE 4-5. Short Cut, Output Setup

NOTE:

Because of the delays using SDI-12, Campbell Scientific recommends measurement

scans of 10 seconds or more.

7. Select the output options.

8. Click Finish and save the program. Send the program to the data logger if the data logger

is connected to the computer.

9. If the sensor is connected to the data logger, check the output of the sensor in the data

display in LoggerNet, RTDAQ, PC400, or PC200W to make sure it is making reasonable

measurements.

5. Overview

The CS475A emits short microwave pulses and measures the elapsed time between the emission

and return of the pulses. The elapsed time measurement is used to calculate the distance

between the sensor face and the target (for example, water, grain, slurry). The distance value can

be used to determine depth of the medium (FIGURE 5-1 (p. 6)).

This radar sensor outputs a digital SDI-12 signal to indicate distance and stage. The output is

acceptable for recording devices with SDI-12 capability.

CS475A Radar Water Level Sensor 5

The CS475A can measure distances up to 35 m (114.8 ft) with an accuracy of ±2 mm (0.0065 ft).

Once the water surface gets within 0.5 m of the sensor, the accuracy will decrease linearly the

closer the water surface gets to the sensor.

FIGURE 5-1. CS475A stage, distance, and offset

Features:

lMeets USGS Office of Surface Water (OSW) requirements for accuracy

lSDI-12 1.4 functionality including SHEF coded metadata

l1 Hz measurements

lMonitors tides for NOAA physical oceanographic real-time system (PORTS®)

lSupports False Echo Suppression via extended SDI-12 command

lEasy to set up and configure over USB or SDI-12

lLow power mode available

lOptional display

lFCC compliant; individual FCC license not required

lLow maintenance—no moving parts significantly reduces maintenance cost and time

lRugged enough for harsh environments—IP68 rating

lCompatible with Campbell Scientific data loggers CR6, CR3000, CR1000X, CR800 series,

CR300 series, and CR1000

CS475A Radar Water Level Sensor 6

5.1 Components and hardware

The radar sensor consists of an integrated microwave transmitter and sensor together with a horn

antenna (FIGURE 5-2 (p. 7)). The horn antenna serves to focus the transmitted signal and to

receive the reflected echo. A built-in SDI-12 interface provides data processing and SDI-12

communications with the data logger.

1 Mounting loop

2 Housing side cap

3 Housing cap

4Unit secondary 0.5 inch NPT cable port,

primary port on opposite side

5 Instrument horn

FIGURE 5-2. Components and hardware

6. Specifications

Measurement range: 0.5 to 35 m (1.64 to 114.8 ft); d in FIGURE 6-1 (p. 8)

Accuracy: ±2 mm (±0.0065 ft)

Resolution: 1 mm (0.0033 ft)

CS475A Radar Water Level Sensor 7

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