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OTT PLS Operating Instructions Manual

Pressure probe
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Operating instructions
Pressure Probe OTT PLS

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Summary of Contents for OTT PLS

  • Page 1 Operating instructions Pressure Probe OTT PLS...
  • Page 2 We reserve the right to make technical changes and improvements without notice.

  • Page 3: Table Of Contents

    5.5 Connecting the OTT PLS to any datalogger using an SDI-12 interface 5.6 Connecting the OTT PLS to any datalogger using a 4 … 20 mA interface 5.7 Determining the maximum load resistance at the 4 … 20 mA interface 5.8 Note on using the 4 …...

  • Page 4: Scope Of Supply

    0 … 100 m – Cable length: 1 … 200 m (with SDI-12 interface: 1 … 100 m) Accessories Humidity absorbing system OTT FAD 4PF 63.025.021.4.2 – desiccant cartridge in clear container with connection tube for pressure compensation capillary Humidity absorbing system OTT FAD 5 63.037.025.3.2...

  • Page 5: Basic Safety Instructions

    For further information ¨ see Chapter 11, "Technical data". Do not make any changes or retrofits to the OTT PLS. If changes or retrofits are made, all guarantee claims are voided. Have a faulty OTT PLS inspected and repaired by our repair center. On no account carry out repairs yourself! For further information ¨...

  • Page 6: Introduction

    4 Introduction The OTT PLS pressure probe is used for precisely measuring the water level of ground and surface waters. The pressure probe uses the hydrostatic pressure of the water column above a relative pressure measuring cell to do so. A pressure compensation capillary in the pressure probe cable gives the measuring cell the current ambient air pressure as a reference.
  • Page 7 Fig. 1: Main layout of a water level station with the OTT PLS pressure probe. Attachment hooks Cable suspension (accessory) Pressure probe cable (e. g. to datalogger) Pressure compensation capillary Pressure probe OTT PLS Pressure-sensitive membrane of the relative pressure...

  • Page 8: Installing The Pressure Probe

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

  • Page 9: Installation Type B: Hanging Pressure Probe

    Fig. 2: Installation example of the OTT PLS pressure probe in open waterways. With waterways with currents or swell, a fixing pin is used to securely fasten the probe. Push the fixing pin through the holes in the black protective cap.

  • Page 10: Connecting Humidity Absorbing System

    If necessary, the pressure probe cable can be lengthened. For this purpose, use a suitable junction box (e. g. OTT FAD 5). This should also be large enough to hold the humidity absorbing system. The maximum cable length for the RS-485 inter- face and the 4 …...

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

    OTT PLS. If the load resistance is greater, the loop current* can no longer be evaluated. Smaller load resistances are allowed. * Due to the imposed (controlled) current by the OTT PLS of the 4 … 20 mA interface (= measured value)

  • Page 12: Note On Using The 4

    Example: Power supply 24 Volt ¨ max. load resistance 620 Ohm. The OTT PLS delivers a loop current corresponding to the measured value for a load resistance of up to 620 Ohm. Dimension the connected electrical circuit accordingly. Check the input resis- tance of the connected peripheral device for this purpose.

  • Page 13: Sdi-12 Commands And Responses

    6 SDI-12 Commands and Responses 6.1 Standard commands All SDI-12 standard commands are implemented in the OTT PLS. The following SDI-12 standard commands are relevant for the operation of the OTT PLS: Command Response Description a<CR><LF> a – sensor address; factory setting = 0 Confirmation active al3ccccccccmmmmmm …...
  • Page 14 – Sensor address – Time in seconds until the sensor has made the result of the system test available Answer OTT PLS = 000 – Number of measured values a<CR><LF> – Service request Answer OTT PLS = 1...

  • Page 15: Advanced Sdi-12 Commands

    Microprocessor-Based Sensors, Version 1.3" (see Internet page "www.sdi-12.org"). 6.2 Advanced SDI-12 commands All advanced SDI-12 commands begin with an " " for OTT. With these commands, it is possible to configure the OTT PLS using the transparent mode of a datalogger. Command...
  • Page 16 9.80659 m/s results. Note The OTT PLS is preset to an average value for Germany (Kassel). The measurement deviation caused by gravitational acceleration is ±3 mm in Germany (Flensburg – Oberstdorf). This measurement error is compensated by inputting the local gravitational acceleration.
  • Page 17 With this command you can add a linear offset (positive/negative) to a level/depth measurement value. After setting the offset value, the OTT PLS automatically starts measured value with command aD0!. After an unsuccessful a measurement. After receiving the service request, check the entry, the pressure probe replies with a new service request.
  • Page 18 Measured value = +2.100 m reference value = +1.500 m output = +1.500 m (offset calculated by the OTT PLS and applied to all other measured values = +0.600 m) Note If the unit is changed afterwards (aOSU<value>!), round- ing errors of ±0.001 are possible.
  • Page 19 Using the commands "setting/reading the upper/lower limit" you can scale the measurement output of an OTT PLS to a smaller measuring range. Where you do not require the whole measuring range, this has the advantage that a higher resolution for the 4 … 20 mA interface can be achieved. Example: A measuring range of 16 mA is available for 5 m water level change (e.g.

  • Page 20: Carrying Out Maintenance Work

    7 Carrying out maintenance work The high-quality design of the OTT PLS makes regular cleaning work unnecessary. Even a thin build-up of deposits on the measuring cell will not appreciably affect the measurement results. If very heavy contamination occurs at the station due to algae, mud, vegetation or sediment, the pressure probe should be checked from time to time.

  • Page 21: Searching For Disruptions/Troubleshooting

    Drops of water in the pressure compensation capillary? ¨ Replace pressure probe. Status output at the 4 … 20 mA interface The OTT PLS with 4 … 20 mA interface indicates the operational state or any faults that might occur via the loop current: Loop current Status 4 …...

  • Page 22: Repair

    Telephone +49 831 5617-433 +49 831 5617-439 repair@ott.com Caution: Only have a defective OTT PLS checked and repaired by the OTT repair center. Under no circumstances carry out any repairs yourself. Any repairs or attempted repairs carried out by the customer will result in the loss of any guarantee rights.

  • Page 23: 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 24 Mechanical Data Dimensions Pressure probe L x Ø 195 mm x 22 mm Cable length 1 … 200 m (with SDI-12 interface: 1 … 100 m) Weight pressure probe approx. 0.3 kg Material Pressure probe housing POM, stainless steel 1.4539 (904 L), resistant to sea water Cable jacket Seals...
  • Page 25 SDI-12). The maximum length of the cable is 100 m. Connect the OTT PLS to the OTT netDL IP datalogger or to the OTT DuoSens Compact Datalogger as shown in Figure 9. Also refer to OTT netDL or OTT DuoSens Operating Instructions.
  • Page 26 Configuring the OTT netDL/OTT DuoSens for the OTT PLS with SDI-12 interface Create an OTT netDL/OTT DuoSens channel with "SDI-12 Master" or "OTT SDI RS485" function block (Serial sensors tab). Apply the following settings: Fig. 11: Setting the operating parameters of the OTT netDL/OTT DuoSens "SDI-12 Mas-...
  • Page 27 * Only in combination with an OTT netDL Notes: To record the two measured values of an OTT PLS, two channels in the OTT netDL/OTT DuoSens are therefore required. The first channel contains the - "SDI-12 Master" or "OTT SDI RS485" as an input signal. The other channel contains a "Virtual Sensor"...

  • Page 28: Appendix B - Connecting The Ott Pls To The Ott Netdl Or Ott Duosens Datalogger Using A 4

    Appendix B – Connecting the OTT PLS to an OTT netDL or OTT DuoSens datalogger using a 4 … 20 mA interface Connect the OTT PLS to the OTT netDL IP datalogger or to the OTT DuoSens Compact Datalogger as shown in Figures 12 and 13. Take note of the operat- ing instructions for the OTT netDL/OTT DuoSens.
  • Page 29 Note on Appendices A and B To reference OTT PLS measured values to a level zero: Enter the contact gauge/staff gauge measurement, for example using the scaling function of the datalogger connected to the OTT PLS (e. g. OTT netDL/OTT DuoSens).

  • Page 30: Appendix C - Installing The Ott Fad 5 Humidity Absorbing System

    Appendix C – Installing the OTT FAD 5 humidity absorbing system The OTT FAD 5 humidity absorbing system accessory for the OTT PLS pressure probe fulfills various functions: drying the air that has entered the pressure compensation capillary; connecting the pressure probe cable with a connection cable to the data - logger/electrical supply via several two-pin connectors;...
  • Page 31 Feed the pressure probe cable through a cable gland on the OTT FAD 5. Only if the OTT FAD 5 is used as the fixing point for hanging the OTT PLS: secure ring terminal with the Phillips screw and put the pressure probe cable under tension.

  • Page 32: Appendix D - Installing The Ott Fad 4Pf Humidity Absorbing System

    Pressure probe cable Pressure compensation capillary PVC tube (Ø 4/2 mm) Dessicant cartridge Humidity absorbing system OTT FAD 4PF Please note the instruction leaflet enclosed with the OTT FAD 4PF for regen - erating the desiccant cartridge.

  • Page 33: Appendix E - Note On Declaration Of Conformity

    Appendix E – Note on Declaration of Conformity If necessary, you can download the current version of the Declaration of Con - formity of the OTT PLS from our website as a PDF file: „www.ott.com/resources“!
  • Page 36 OTT Hydromet GmbH Ludwigstrasse 16 87437 Kempten · Germany Phone +49 831 5617-0 +49 831 5617-209 Document number 63.037.001.B.E 08-0818 info@ott.com · www.ott.com...

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