Campbell-scientific OBS500 Smart Turbidity Meter with ClearSensor Tech Manual de usuario Pagina 28
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OBS500 Smart Turbidity Meter with ClearSensor™ Technology
7.3.2 RS-232 Wiring
Our CR800, CR850, CR1000, and CR3000 dataloggers have COM ports
(control port Tx/Rx pairs) that can be used to measure RS-232 sensors.
TABLE 7-5. RS-232 Wiring
Color
OBS500 Function
Connection
RS-232 9-pin /
Datalogger Control Port
Red +12VDC Power Source
Black Power Ground Power Ground
White RS-232 Tx (Output)
Transmit
Pin 2 Rx (Input)/
Control Port Rx
Blue RS-232 Rx (Input) Receive
Pin 3 Tx (Output)/
Control Port Tx
Brown
Green
Clear Shield GND Ground
7.3.3 Analog 0 to 5 Volt Wiring
TABLE 7-6. Analog 0-5 Volt Wiring
Color
Description
CR800, CR850,
CR1000, CR3000, CR5000,
CR23X, CR10X
Blue Shutter Open - Control High Control Port
White Backscatter (Low) or Side Scatter
(High) Control
Control Port
Green Signal Differential High or Single-
Ended Input
Brown Analog Ground Differential Low or Analog
Ground
Black Power Ground G
Red Power SW12V
Clear Shield G
The measurement sequence is to raise the blue wire from ground to 5 volts to
open the shutter, delay 6 seconds, and then measure the backscatter analog
output on the green wire. If side scatter is desired, then raise the white wire
from ground to 5 volts, delay 3 seconds, and then measure the side scatter
analog output on the green wire. In either case, lower the blue wire to ground
to close the shutter. Note that measurements can be differential or single-
ended. Differential measurements are recommended.
The output is scaled as 1 mV per TU. For example, 100 mV = 100 TU, 4000 mV =
4000 TU.
18
- OPERATOR’S MANUAL 1
- Limited Warranty 3
- Assistance 4
- Precautions 5
- Table of Contents 10
- OBS500 Smart Turbidity Meter 11
- 3. Initial Inspection 12
- 4. Quickstart 12
- 5. Overview 18
- 5.1 Applications 19
- 5.2 Turbidity Units 19
- 5.3 Measurement Details 20
- to 170° 21
- 6. Specifications 22
- 7. Installation 23
- 7.3.1 SDI-12 Wiring 27
- 7.3.2 RS-232 Wiring 28
- 7.4 Communication Modes 29
- 7.5 Calibration 32
- Turbidity (NTU) 33
- 7.5.2 Sediment 36
- 7.6 Programming 39
- Sediment Measurements 43
- 8.3 Particle-Shape Effects 44
- Scattering Angle 45
- 8.6 Water Color 47
- 8.7 Bubbles and Plankton 47
- 9. Maintenance 48
- 10. Troubleshooting 49
- 11. References 51
- A.1.1 CRBasic Datalogger 53
- A.1.2 Edlog 54
- B.1 CR1000 SDI-12 Program 55
- B.2 CR1000 RS-232 Program 56
- B.3 CR1000 Analog Program 57
- Program 59
- Installation 61
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