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OTT PLS-C Operating Instructions Manual

Pressure probe with conductivity sensor
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Operating Instructions
Pressure Probe with
Conductivity Sensor OTT PLS-C

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Summary of Contents for OTT PLS-C

  • Page 1 Operating Instructions Pressure Probe with Conductivity Sensor OTT PLS-C...
  • Page 2 We reserve the right to make technical changes and improvements without notice.

  • Page 3: Table Of Contents

    3 Basic safety instructions 4 Introduction 5 Installing the OTT PLS-C 5.1 Installation type A: Fixing the OTT PLS-C in a protective device 5.2 Installation type B: Suspending the OTT PLS-C 5.3 Connecting the humidity absorber 5.4 Wire assignment of the pressure probe cable 5.5 Connecting the OTT PLS-C to any datalogger using an SDI-12 interface...

  • Page 4: Scope Of Supply

    55.445.025.9.2 OTT USB/SDI-12 interface 65.050.001.9.2 – including software "OTT SDI-12 Interface" OTT SDI-12 Interface – OTT FAD 5 connecting kit 97.120.432.3.5 – for temporary connection the OTT PLS-C and OTT USB/SDI-12 interface within the OTT FAD 5 during conductivity sensor calibration...

  • Page 5: Basic Safety Instructions

    3 Basic safety information Read these operating instructions before using the OTT PLS-C for the first time! Make yourself completely familiar with installing and operating the OTT PLS-C! Keep these operating instructions for later reference. The OTT PLS-C is used in hydrometry for measuring the water level, temperature, and specific conductivity of ground and surface waters.

  • Page 6: Introduction

    A particular feature of the OTT PLS-C is that the unit measures the water temperature as well as the hydrostatic pressure of the water column and thus achieves highly...
  • Page 7 Fig. 1: Basic layout of a water level station using the OTT PLS-C pressure probe with Hook conductivity sensor. Cable suspension (accessory) Pressure probe cable (e.g. to datalogger) Pressure compensating capillary OTT PLS-C Temperature sensor Conductivity sensor Pressure sensor...

  • Page 8: Installing The Ott Pls-C

    5 Installing the OTT PLS-C The OTT PLS-C may be used in a variety of ways, for example in observation wells or boreholes from 1" diameter upwards, in shafts, open waterways, and in waterways that do not always hold water.

  • Page 9: Installation Type B: Suspending The Ott Pls-C

    When the pressure probe cable ends in immediate vicinity of the cable attachment: Additionally fix the Kevlar fibers to a suitable point! Carefully lower the OTT PLS-C on the pressure probe cable to the specified depth. There are markings on the cable every 0.25 m to assist in lowering the unit.

  • Page 10: Connecting The Humidity Absorber

    If necessary, the pressure probe cable may be lengthened. For this purpose, use a suitable terminal box (e. g. OTT FAD 5; it includes a humidity absorber). The maximum cable length for the RS-485 interface is 1,000 m! Recommended cable type for the RS-485 interface: Shielded, twisted pair cable.

  • Page 11: Connecting The Ott Pls-C To Any Datalogger Using An Sdi-12 Interface

    5.5 Connecting the OTT PLS-C to any datalogger using an SDI-12 interface Connect the OTT PLS-C to an SDI-12 input of the datalogger. Follow the data- logger manual when doing this. Refer to Figure 4 for the wire assignments of the OTT PLS-C.

  • Page 12: Sdi-12 Commands And Responses

    6 SDI-12 commands and responses 6.1 Basic commands All SDI-12 basic commands are implemented in the OTT PLS-C. The following SDI-12 basic commands are relevant for the operation of the OTT PLS-C: Command Response Description a<CR><LF> a Sensor address; factory setting = 0 Acknowledgment active al3ccccccccmmmmmm …...
  • Page 13 Query status of the last measurement a<CR><LF> and immediately afterwards – Sensor address – Time in seconds until the sensor provides the status Response: OTT PLS-C = 000 – Number of measured values a<CR><LF> – Service request Response: OTT PLS-C = 1 aD0! a<value><CR><LF>...
  • Page 14 – Sensor address – Time in seconds until the sensor provides the result of the system test Response: OTT PLS-C = 000 – Number of measured values a<CR><LF> – Service request Response: OTT PLS-C = 1 aD0! a<value><CR><LF>...

  • Page 15: Advanced Sdi-12 Commands

    6.2 Advanced SDI-12 commands All advanced SDI-12 commands are preceded by " " which stands for OTT. Using these commands, the OTT PLS-C may be configured from Transparent Mode of a datalogger. Command Response Description Set/read the unit for level/pressure measured values aOSU<value>!
  • Page 16 – Number after decimal point Value range: +0.40 ... +0.75 Factory setting: +0.64 The OTT PLS-C calculates the TDS value from the conductivity measured using the following equation: TDS [ppm] = 0.64 x electrical conductivity [mS/cm]. This equation is valid for a situation in which the measurement medium is affected by sea water.
  • Page 17 9.80659 m/s results. Note The OTT PLS.C is preset to an average value for Germany (Kassel). The measured value deviation caused by gravitational acceleration is ±3mm in Germany (Flensburg – Oberstdorf). This measurement error is compensated by inputting the local...
  • Page 18 For calculating the water level, the dynamic density compen- sation takes into account the actually present water density (Pascal's law). The OTT PLS-C calculates this value from the present salinity and temperature values. This is always useful whenever the local water density is different from that of pure water (e.g.
  • Page 19 Reference value= +1.500 m Output = +1.500 m (offset that is calculated by the OTT PLS-C and applied to any other measured values = +0.600 m) Note When changing the unit afterwards (aOSU<value>!), a rounding error of ±0.001 may occur.

  • Page 20: Carrying Out Maintenance Operations

    Determine the current level value (SDI-12 basic command "Start Measurement") and compare with reference value (staff gauge, contact gauge) and correct as necessary (position of the OTT PLS-C is not the same before and after calibrat- ing procedure. Use scaling functionality of the datalogger attached to enter the reference/offset value or enter them directly).

  • Page 21: Calibrating The Conductivity Sensor

    – Power supply (6 … 27 V) for OTT PLS-C (refer to Chapter 2, "Order numbers"). Please note: For an optimum calibration process, the OTT PLS-C and the calibration solution must be at ambient temperature! During the calibration procedure, power must continuously be applied to the OTT PLS-C.
  • Page 22 Determine the current level value (SDI-12 basic command "Start Measurement") and compare with reference value (staff gauge, contact gauge) and correct as necessary (position of the OTT PLS-C is not the same before and after calibrat- ing procedure) (use scaling functionality of the datalogger attached to enter the reference/offset value or enter them directly).

  • Page 23: Troubleshooting

    Is the supply voltage no direct current? ¨ Operate sensor on direct current only. Does the sensor address of the OTT PLS-C match the sensor address that the datalogger uses? ¨ Correct sensor address. Measured values are fluctuating, incorrect, or not available Sensor contaminated? ¨...

  • Page 24: Repair

    Telephone +49 831 5617-433 +49 831 5617-439 repair@ott.com Please note: Have a faulty OTT PLS-C checked and repaired only by the OTT repair center. Never attempt to repair the unit yourself! Any repairs or attempted repairs carried out by the client will void any warranty.

  • Page 25: Technical Data

    11 Technical data Water level Measuring range 0 … 4 m water column (0 ... 0.4 bar) 0 … 10 m water column (0 ... 1 bar) 0 … 20 m water column (0 ... 2 bar) 0 … 40 m water column (0 ... 4 bar) 0 …...
  • Page 26 Individually configurable functions – Selection of units – Pressure/level measurement or depth measurement – With consideration of the local gravitational acceleration – Compensate for water density using salinity and temperature – Temperature compensation for conductivity. Options: freshwater; saltwater; standard method 2510 (reference temperature: 25 °C or 20 °C); ISO 7888 / EN 27888; none –...

  • Page 27: Appendix A - Connecting The Ott Pls-C To An Ott Netdl Or Ott Duosens Datalogger Via Sdi-12 Or Rs-485 Interface

    Appendix A – Connecting the OTT PLS-C to an OTT netDL or OTT DuoSens datalogger via SDI-12 or RS-485 interface Method A: Connecting the OTT PLS-C via the SDI-12 interface (protocol and physical interface: SDI-12). The maximum cable length is 100 m.
  • Page 28 Configuring the OTT netDL/OTT DuoSens for OTT PLS-C with SDI-12 interface Create an OTT netDL/OTT DuoSens channel using the "SDI-12 Master" or "OTT SDI RS485" function block ("Serial Sensors" tab). Make the following settings: Fig. 9: Setting the operating parameters of the OTT netDL/OTT DuoSens "SDI-12 Master"...
  • Page 29 PSU: 2, ppt: 2, g/l: 3; °C: 2, °F: 2; Status: 0). Notes: To record the five measured values of an OTT PLS-C, five channels in the OTT netDL/ OTT DuoSens are therefore required. The first channel contains the function block "SDI-12 Master" or "OTT SDI RS485" as an input signal. Each of the other channels contains a "Virtual Sensor"...
  • Page 30 +28 V (example: SDI-12 interface) SDI-12 Connection cable Datalogger RS-485 Pressure probe cable +5 … +28 V OTT PLS-C SDI-12 RS-485 Fig. 10: Installation options overview – connecting the OTT PLS-C to a datalogger, e.g. to an OTT netDL 500.

  • Page 31: Appendix B - Installing The Ott Fad 5 Humidity Absorber

    Appendix B – Installing the OTT FAD 5 humidity absorber The OTT FAD 5 humidity absorber as an accessory to the OTT PLS-C fulfills multiple functions: Drying the air that has entered the pressure compensating capillary; Connecting the pressure probe cable with a connection cable to the data - logger/power supply via several two-wire terminals;...
  • Page 32 Feed the pressure probe cable through a cable gland of the OTT FAD 5. Only when the OTT FAD 5 is used as the fixing point for suspending the OTT PLS-C: Secure the ring terminal using the Phillips screw supplied and put the pressure probe cable under tension.
  • Page 33 For wire assignment, see sticker on the housing lid of the OTT FAD 5. Connection to the dataloggers OTT netDL or OTT DuoSens by using the 2-wire terminals (included in the OTT FAD 5 scope of delivery) Connection to dataloggers of third-party manufacturers by using the „OTT SDI-12 Interface –...

  • Page 34: Appendix C - Installing The Ott Fad 4Pf Humidity Absorber

    Appendix C – Installing the OTT FAD 4PF humidity absorber The OTT FAD 4PF humidity absorber dries the surrounding air that enters the pressure compensating capillary. Mount the humidity absorber at the driest position possible (e.g. using double- sided tape). If this is in a control cabinet, it is important that there is pressure compensation to the surroundings (no hermetically sealed enclosure!).

  • Page 35: Appendix D - Ott Pls-C Declaration Of Conformity

    Appendix D – OTT PLS-C Declaration of Conformity...
  • Page 36 OTT Hydromet GmbH Ludwigstrasse 16 87437 Kempten · Germany Phone +49 831 5617-0 +49 831 5617-209 Document number 63.038.001.B.E 01-0813 info@ott.com · www.ott.com...

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