Campbell OBS-3 Manuel utilisateur

INSTRUCTION MANUAL

Interfacing the

OBS-3 Turbidity Monitor with

Campbell Scientific Dataloggers

10/05

Campbell Scientific, Inc.

Disclaimer

This manual concerns interfacing another manufacturer’s product with our

dataloggers. We will attempt to provide accurate and up-to-date information in

this manual. However, changes to another manufacturer’s product are beyond

our control. Such changes may affect hookup, programming, and even safe

use of the product. Also, this manual should be used in conjunction with the

original manufacturer’s technical reference documentation. See their

documentation for information concerning product use and safety. If you

encounter out-of-date, incomplete, or incorrect information, please contact us

so we can attempt to remedy the situation.

Because the product is manufactured by another company, their warranty

applies. Contact the original manufacturer for warranty information, repairs,

and recalibrations.

Our website (http://www.campbellsci.com) lists the updated manuals.

OBS-3 Table of 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.

1. Connections.................................................................1

2. Programming ...............................................................3

2.1 Using Short Cut........................................................................................3

2.2 Using Edlog or the Keyboard/Display......................................................3

2.3 Edlog Program Example...........................................................................3

2.4 CRBasic Program Example ......................................................................5

3. Maintenance and Troubleshooting ............................5

Figures

1. Wiring Diagram of OBS-3 Using Datalogger’s Switched 12 V.................1

2. Wiring Diagram of OBS-3 without Using Switched 12 V.........................2

3. Wiring Diagram for Connecting an OBS-3 to an External Relay

and a Datalogger....................................................................................2

This is a blank page.

Interfacing the OBS-3 Turbidity Monitor

with Campbell Scientific Dataloggers

The OBS-3 Turbidity Monitor is a submersible probe manufactured and sold by D & A

Instrument Company. This application note provides a diagram of connecting the OBS-3

to a CR1000, CR10(X), CR23X, and CR510 datalogger and describes programming a

datalogger to read this probe.

The standard output for the OBS-3 is 0 to 5 V, which may be used with the CR23X and

CR1000. If response over 1000 FTU is needed for use with the CR10(X) or CR510

datalogger, order the probe with the optional 0 to 2500 mV output range.

When turbidity is very high, the OBS-3 probe can generate an

output greater than 5 V. To avoid the loss of data, ask D & A

Instruments to install a voltage limiting circuit in the probe that

clamps the output to 2.5 V or 5.0 V.

The OBS-3 probe may draw over 30 mA. Because this power

requirement is relatively high, we recommend you provide

switched power, such as the switched 12 V on the CR10X,

CR1000, and CR23X wiring panel. If power to the sensor is

continuous, you must use AC power or a solar panel with

excellent solar availability to maintain a good charge on the

battery.

1. Connections

Red SW 12V

White

Green

Black

CR1000

FIGURE 1. Wiring Diagram of OBS-3 Using

Datalogger’s Switched 12 V

NOTE

Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers

Red 12V

White

Green

Black

Jumper

CR510, CR500

21X

FIGURE 2. Wiring Diagram of OBS-3 without Using Switched 12 V

- Load +

#7321

RELAY

- Control +

12v

Red

Black

White

Green

Jumper

Datalogger

FIGURE 3. Wiring Diagram for Connecting an OBS-3 to

an External Relay and a Datalogger

1. The assignment of channel number (e.g., Diff Channel 1 or

C1) may vary depending on the application.

2. You may use a relay such as Campbell Scientific part #7321

instead of the switched 12 V connection on the CR10(X),

CR1000, and CR23X wiring panel. Since the CR510 wiring

panels do not have switched 12 V, you will need an external

relay if you need to conserve battery power.

NOTE

CR510

21X

Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers

2. Programming

Use Short Cut, Edlog, or the keyboard/display to program the datalogger to

read the OBS-3 probe.

2.1 Using Short Cut

Short Cut is the easiest and typically the preferred method for programming the

datalogger. With Short Cut, you choose the OBS-3 probe and your output

preferences from a series of menus, then Short Cut creates a custom program

and wiring diagram for you.

2.2 Using Edlog or the Keyboard/Display

Edlog dataloggers: Use Instruction 2--Differential Voltage to read the probe’s

millivolt signal. This instruction requires a multiplier to be calculated. The

multiplier is the full scale FTU value divided by the probe’s full scale millivolt

output. Typically, the offset is zero.

CRBasic dataloggers: Use VoltDiff instruction to read the probe’s millivolt

signal. This instruction requires a multiplier to be calculated. The multiplier

is the full scale FTU value divided by the probe’s full scale millivolt output.

Typically, the offset is zero.

2.3 Edlog Program Example

The program on the following page reads an OBS-3 probe that’s using

switched 12 V power, either built-in or using an external relay. The program

could be used for a CR10(X) or CR510. Except for parameters 2 and 5 in

Instruction 2 (Differential Voltage), the 21X and CR23X programs are the

same. The appropriate parameters for the 21X and CR23X are displayed in

bold lettering.

;Program to read OBS-3 Turbidity Monitor with 0 to 2500 mV output

;and 2000 FTU.

*Table 1 Program

;Pick the execution interval you need. Five seconds is OK for testing.

01: 5.0 Execution Interval (seconds)

;Power-up probe and provide warm-up time

1: Do (P86)

1: 41 Set Port 1 High ; Port number corresponds to C1

2: Excitation with Delay (P22)

1: 1 Ex Channel

2: 0 Delay W/Ex (units = 0.01 sec)

3: 100 Delay After Ex (units = 0.01 sec)

4: 0 mV Excitation

Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers

;Read millivolt signal

3: Volts (DIFF) (P2)

1: 1 Reps

2: 25 2500 mV 60 Hz Rejection Range ;CR23X is 25 ± 5000 mV 60 Hz Rejection Range

3: 1 DIFF Channel

4: 1 Loc [ Turbidity ]

5: 0.8 Mult ;(2000FTU)/(2500mV)CR23Xwouldbe2000/5000=0.4

6: 0.0 Offset

;Remove power from probe

4: Do (P86)

1: 51 Set Port 1 Low

;Measure system voltage

5: Batt Voltage (P10)

1: 2 Loc [ BATT_VOLT ]

;Output every hour the date and the average turbidity, maximum

;turbidity with the time of occurrence, and battery voltage.

6: If time is (P92)

1: 0 Minutes into a

2: 60 Interval

3: 10 Set Output Flag High

7: Real Time (P77)

1: 1110 Year, Day, Hour/Minute

8: Average (P71)

1: 1 Reps

2: 1 Loc [ Turbidity ]

9: Maximize (P73)

1: 1 Reps

2: 10 Value with Hr_Min

3: 1 Loc [Turbidity ]

10: Sample (P70)

1: 1 Reps

2: 2 Loc [ BATT_VOLT ]

Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers

2.4 CRBasic Program Example

'CR1000

'Declare Variables and Units

Public Batt_Volt

Public FTU

Units Batt_Volt=Volts

'Define Data Tables

DataTable(Table1,True,-1)

DataInterval(0,60,Min,10)

Average(1,FTU,IEEE4,False)

Maximum(1,FTU,IEEE4,False,True)

EndTable

DataTable(Table2,True,-1)

DataInterval(0,1440,Min,10)

Minimum(1,Batt_Volt,FP2,False,False)

EndTable

'Main Program

BeginProg

Scan(30,Min,1,0)

'Default Datalogger Battery Voltage measurement Batt_Volt:

Battery(Batt_Volt)

'OBS-3 Turbidity Probe (D&A Instruments) measurement FTU:

PortSet(9,1)

Delay(0,3,Sec)

VoltDiff(FTU,1,mV5000,1,True,0,_60Hz,0.4,0) 'MULTIPLIER: (2000 FTU)/(5000 mV) = 0.4

PortSet(9,0)

'Call Data Tables and Store Data

CallTable(Table1)

CallTable(Table2)

NextScan

EndProg

3. Maintenance and Troubleshooting

Follow the maintenance and troubleshooting procedures that are outlined in the

OBS-3 technical manual provided by D & A Instrument Company.

Interfacing the OBS-3 Turbidity Monitor with Campbell Scientific Dataloggers

This is a blank page.

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