FTS DTS-12 User Manual
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FTS DTS-12 User Manual

Sdi turbidity sensor
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DTS-12
SDI Turbidity Sensor
User Manual
1.800.548.4264
www.ftshydrology.com
700-DTS-12 – Rev. 20, 08 Jan 2014

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  • Page 1 DTS-12 SDI Turbidity Sensor User Manual 1.800.548.4264 www.ftshydrology.com 700-DTS-12 – Rev. 20, 08 Jan 2014...

  • Page 2: Contact Information

    Contact information 1065 Henry Eng Place Victoria, B.C., V9B 6B2 CANADA www.ftshydrology.com Toll-free 1-800-548-4264 Local 250-478-5561 Technical support support.ftshydrology.com...
  • Page 3 Revision History Date Person Description 27 Jan 2012 Update for DTS-12A and format to current standard 10 Dec 2012 Correction made to BES equation on pg 12 16 May 2013 Clarification improvements and added appendices 13 June 2013 Updated cable connect/disconnect instructions and deployment guide 12 July 2013 Updated deployment guide drawings 08 Jan 2013...

  • Page 4: Table Of Contents

    Commands recognized by the DTS-12 ........................16 General SDI commands ..............................18 SDI measurement and data commands ......................... 18 Extended command set ..............................21 Chapter 3 Technical specifications ......................22 Appendix A Commands recognized by the DTS-12 (historical) ......................25...

  • Page 5: Chapter 1 Operation

    SDI Connection ................................... 9 1.4.1 SDI-12 connectorized cable 1.4.1.1 Cable connection 1.4.1.2 Cable disconnection Operation ................................... 11 1.5.1 Startup Operation of Turbidity Sensor 1.5.2 Turbidity measurement 1.5.3 DTS-12 calculations Address configuration ..............................12 Calibration and maintenance ............................. 12 Replacement Parts ................................14...

  • Page 6: General Description

    1500 NTU, making it ideal for stream and river applications. The DTS-12 has a built in wiper that is useful for reducing the effects of silt build up and biological fouling of the sensor optics. The DTS-12 is factory programmed with turbidity calibration coefficients. The micro controller applies these coefficients to the raw measurement data and computes mean, median, maximum, minimum, variance, and BES (Best Easy Systematic estimator).

  • Page 7: Unpacking

    Figure 1-2 shows such an installation. If in doubt consult FTS regarding the best deployment options for your site. The DTS-12 must be oriented such that the optical window has at least 4 inches axial end clearance and 2 inches radial side clearance from any physical objects (e.g.
  • Page 8 DTS-12 User Manual Chapter 1 Operation To aid in installation, FTS can supply a DTS-12 sensor deployment guide. This “deployment guide” can be used in conjunction with the user supplied and constructed 4-inch ID deployment tube. The deployment guide can be slid down the inside of the protective tubing (typically schedule 40 Aluminum or PVC pipe) that is placed in the river.

  • Page 9: Sdi Connection

    Figure 1-5: Typical DTS-12 deployment tube and deployment guide combination SDI Connection The SDI cable (nominally 25 feet long) may be connected to the DTS-12 by waterproof gland or underwater connector. Normally the free end of the cable is shipped with a length of the polyurethane jacket removed to expose the three 20 AWG conductors.

  • Page 10: 1.4.1 Sdi-12 Connectorized Cable

    Chapter 1 Operation 1.4.1 SDI-12 connectorized cable The DTS-12 can be ordered with fixed length connectorized cables (60 and 100 ft.) that allow for quick disconnect and re-connection. This watertight connection is submersible and permits easy sensor removal from a field installation without removing the cable.

  • Page 11: Operation

    1.5.1 Startup Operation of Turbidity Sensor When power is first applied to the DTS-12 a wipe cycle will occur. This is a normal part of the sensor initialization. When the wiper returns to its normal parked position the DTS-12 is ready to accept SDI commands.

  • Page 12: Address Configuration

    ‘I’ in the sorted list Address configuration The DTS-12 is shipped with default address 0 (unless shipped as part of an integrated FTS system). Refer to section 2.3.3 Change Address for instructions on setting the sensor’s address. Calibration and maintenance The only field maintenance required by the DTS-12 is a periodic check of the wiper for deterioration or fouling with biological or other material.
  • Page 13 If the wiper blade edge appears ragged or uneven then the wiper assembly should be replaced. Each DTS-12 is shipped with a spare piece of wiper material (698-DTS12-WIPER) packaged in a small zip-lock bag attached to the cable. These can be changed as shown below. Complete replacement wiper arm assemblies may also be purchased from FTS (part # DTS12-WIPER).

  • Page 14: Replacement Parts

    Chapter 1 Operation Replacement Parts If replacement parts are required, the entire wiper assembly shown in Figure 1-8 (p. 13) can be ordered from FTS by specifying part number DTS12-WIPER. If individual components are required, specify part number according to the table below.

  • Page 15: Chapter 2 Sdi Commands

    Chapter 2 SDI Commands Chapter contents Notation for SDI commands............................16 Commands recognized by the DTS-12 ........................16 General SDI commands ..............................18 2.3.1 Address Query 2.3.2 Acknowledge Active 2.3.3 Change Address 2.3.4 Send Identification SDI measurement and data commands ......................... 18 2.4.1...

  • Page 16: Notation For Sdi Commands

    Address Query). Valid values 0-9, a-z, A-Z. Commands recognized by the DTS-12 The table below provides a quick reference to the commands recognized by the DTS-12. For details on these commands, see the following sections. IMPORTANT ! The commands below are for DTS-12 version 20 and up. To determine your version number perform an Identification Command and look at the VX field.
  • Page 17 DTS-12 User Manual Chapter 2 SDI Commands Command name Command code Notes Start Measurement: No wipe before measurement aMC! Mean (average) Mode = aM0!,aM0C! Mean (average) mode returns 3 data points. aCC! Temperature, Mean Turbidity, Variance of the Mean Start Measurement: Mean, Variance,...

  • Page 18: General Sdi Commands

    DTS-12 User Manual Chapter 2 SDI Commands General SDI commands General SDI commands are used for housekeeping issues such as device address configuration, device identification and confirmation of device communications. General SDI-12 version 1.3 commands are as follows. 2.3.1 Address Query This command requests the address of the SDI sensor.
  • Page 19 DTS-12 User Manual Chapter 2 SDI Commands 2.4.1 Start Measurement This command is used trigger a measurement on the addressed sensor. The sensor will not return data, instead the sensor will return the duration of the measurement as well as the number of data points returned by the measurement.
  • Page 20 3 Resp sensor SDI address DTS-12 is not a continuous measurement device. No data is returned. 1RC! perform a continuous measurement read on sensor at address 3, with CRC code in data response...

  • Page 21: Extended Command Set

    DTS-12 User Manual Chapter 2 SDI Commands Extended command set 2.5.1 Enable Median in M command String Note 3X se mc m! Enable Median M command on sensor at address 3 Resp device SDI address 2.5.2 Enable Mean (average) in M command...

  • Page 22: Chapter 3 Technical Specifications

    Chapter 3 Technical specifications...
  • Page 23 DTS-12 User Manual Chapter 3 Technical specifications Sensor type Temperature: Encapsulated thermistor Turbidity: Optical nephelometer (sidescatter) Interface SDI-12 v.1.3 Operating temperature range 0°C to +40°C (non-freezing) Depth rating 30 m Wipe time 5 s (nom.) Accuracy – Temperature ±0.2°C Range – Turbidity 0 –...
  • Page 24 Appendix A...

  • Page 25: Commands Recognized By The Dts-12 (Historical)

    See section 2.2 for newer command set. The DTS-12 supports an extended SDI-12 command set to enable certain features that are not supported by the standard SDI-12 version 1.1 protocol. One of these Extended Commands adds the ability to change the address of the sensor.
  • Page 26 DTS-12 User Manual Appendix A Command name Command code Notes Start Measurement: Only Version 11 and up can toggle between aM0! Median and Mean(avg) mode. If less than Median Mode (factory default)= Version 11 then mode will be set to Mean.
  • Page 27 DTS-12 User Manual Appendix A Command name Command code Notes Set low temperature wipe cutoff aC80n! Unlock is required prior to command value Temperature=n (default is 2), C Version 11 or higher aC81! Enable low temperature wipe cutoff Unlock is required prior to command...

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