OTT SVR 100 X2 Integration Guide

The OTT SVR 100 is a surface water velocity radar sensor designed for measuring flow in open channels and rivers. The sensor is compatible with the X2 data logger utilizing SDI-12 communication and creating a generic SDI-12 script in the CONNECT software. Simple settings on the sensor may be adjusted using the OTT SVR 100 Operating Program via an RS-232 interface. Below is information on the settings and wiring required to integrate this sensor with the X2 data logger.

 

Wiring

NexSens can provide a connectorized UW8 plug on the end of the OTT SVR 100 factory cable for integration with an X2 data logger, or a UW8 to flying lead cable may be utilized for wiring into a junction box. The following table refers to the latter application.

 

NexSens UW8 Plug Pin	NexSens UW8-FLx Wire Color*	Signal	OTT Sensor Cable Wire Color
2	Black	Ground	Grey & White
5	Red	12V Power	Brown
6	Brown	SDI-12	Red

*NexSens UW Plug to Flying Lead Cable

 

 

Configure Communication

An RS-232 USB cable with a separate external power source may be utilized for communication with the OTT SVR 100 sensor in the OTT SVR 100 Operating Program. Default SDI-12 settings do not need changed for communication with the X2 data logger. This operating program allows for viewing real-time data and changing the following settings:

1. Device SDI-12 address
2. Filter Type
3. Filter Length
4. Radar Sensitivity
5. Flow Direction Filter

NexSens RS-232 USB Cable Wire Color	Signal	OTT Sensor Cable Wire Color
Yellow	RS-232 Tx	Green
Orange	RS-232 Rx	Yellow
Black	Ground	White & Grey
–*	+9…+27VDC	Brown**

*No external power source should be connected to the USB cable.
**An external power source must be utilized to provide between 9-27VDC to the sensor. Ensure that the external power source has a common ground with the USB cable and OTT sensor cable.

 

X2 Script Information & Sensor Parameters

Create a generic SDI-12 script through the CONNECT Software with the following settings:

• Manufacturer: Generic
• Model: SDI-12
• SDI-12 Address: 0-9
  • Ensure the OTT sensor has a unique SDI-12 address from other SDI-12 sensors connected to the X2.
  • The default address for the sensor is 0.
• Port: P0, P1, or P2
  • Ensure to connect the sensor to the port number selected in the script.
• Warmup: 40 seconds
• Measurement Command: C
• Power: Switch
• Parameters:

CONNECT Parameter Name	Units	OTT SVR 100 Parameter Name	Description
Velocity	m/s	Mean Velocity of Flow	Average flow velocity over approximately 30 seconds.
Velocity	m/s	Current Velocity of Flow	Current flow velocity.
Parm 01	deg	Sensor Tilt Angle	Inclination relative to the water surface. Optimal range is between 30 and 45 degrees.
Parm 02	—	Signal Quality Index	Quality of radar signal received for measurement. 0 – Good Signal 3- Very bad signal
Parm 03	—	Vibration Index	Measure of vibrations in deployment area. 0 – No vibration 3- Very strong vibrations (Data unacceptable)
SNR	dB	Signal-to-Noise Ratio	Measure of desired radar signal to the level of background noise. >6 – Good signal

 

Enable the newly generated script by following the article below:

Configure Sensor Scripts