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OTT RLS Operating Instructions Manual

Radar level sensor
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Operating instructions
Radar Level Sensor
OTT RLS

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Summary of Contents for OTT RLS

  • Page 1 Operating instructions Radar Level Sensor OTT RLS...
  • Page 2 We reserve the right to make technical changes and improvements without notice.

  • Page 3: Table Of Contents

    5.8 Connecting the OTT RLS to LogoSens 2 or DuoSens using an SDI-12 or RS-485 interface 5.9 Connecting the OTT RLS to LogoSens 2 or DuoSens using a 4 … 20 mA interface ..

  • Page 4: Scope Of Supply

    1 Scope of supply OTT RLS – 1 Radar sensor OTT RLS, two part gimbal-mounting (consisting of device and wall brackets) – 1 Set of installation fittings (4 x wood screws 6 x 40; 4 x plastic plugs S8) – 2 Double open-ended wrenches size 10 x 13 –...

  • Page 5: Basic Safety Information

    All safety information in these operating instructions are identified with the warning symbol shown here. Never use the OTT RLS in areas where there is a danger of explosion. For fur- ther information ➝ see Chapter 5, "Installing the OTT RLS".

  • Page 6: Introduction

    4 Introduction The OTT RLS radar sensor is used for contactless measurement of the levels of sur- face water. The OTT RLS is based on impulse radar technology. The transmitting antenna transmits short radar pulses in the 24 GHz ISM band. The separate receiver...
  • Page 7 Fig. 2: Application example 1: Mounting the OTT RLS on a bridge. The projection of the sensor beam onto the water surface is virtually round. OTT RLS Sensor beam Fig. 3: Application example 2: Mounting the OTT RLS on an auxiliary OTT RLS construction, e.g.

  • Page 8: Installing The Ott Rls

    Danger of explosion due to spark formation and electrostatic discharge The use of the OTT RLS in explosive atmospheres can lead to the danger of ignition of this atmosphere. An explosion resulting from this involves the risk of very severe material and personal damage.

  • Page 9: Notes On Power Supply

    5.2 Notes on power supply The OTT RLS requires a power supply of 9.6 … 28 V direct current of type 12/24 V DC (e. g. a battery or mains connection with galvanically isolated low safety voltage). The OTT RLS is immediately ready for operation after connecting the power supply.
  • Page 10 Tighten the hex bolts B on the housing shell. Tighten the hex bolts A on the wall and housing brackets. Check alignment of the OTT RLS once more. Warning: The alignment of the sensor parallel to the water surface must be carried out as accurately as possible! ➝...

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

    5.6 Connecting the OTT RLS to any datalogger using a 4 … 20 mA interface Connect the OTT CBS to a 4 … 20 mA input of the datalogger. Follow the dat- alogger handbook as you do this as well as Chapter 12 of these instructions.

  • Page 12: Connecting The Ott Rls To Logosens 2 Or Duosens Using An Sdi-12 Or Rs-485 Interface

    SDI-12). The maximum length of the cable is 70 m. Recommended cable cross-section: 0.25 mm Connect the OTT RLS to the LogoSens 2 Station Manager or to the DuoSens Compact Datalogger as shown in Figure 8. Take note of the operating instruc- tions for the LogoSens 2/DuoSens.
  • Page 13 RS-485 interface). Refer to Chapter 5.3 for the maximum cable length and the recommended cross-section of the cable: Connect the OTT RLS to the LogoSens 2 Station Manager or to the DuoSens Compact Datalogger as shown in Figure 9. Take note of the operating instruct- ions for the LogoSens 2/DuoSens.

  • Page 14: Connecting The Ott Rls To Logosens 2 Or Duosens Using A 4

    In the relevant Channel function blocks, adjust the required units and number of digits after the decimal place (m: 3; cm: 0; ft: 2). Note: To record all three values + status information of an OTT RLS, four chan- nels in the LogoSens 2/DuoSens are thus necessary. The first channel contains the function block SDI-12 Master or OTT SDI RS485 as the input signal.
  • Page 15 LogoSens 2. The supply to the current loop in the applica- 100 Ohm resistor tion case shown is via the OTT LogoSens 2. Fig. 12: Connecting the OTT RLS to Duo- Sens using a 4 … 20 mA interface.
  • Page 16 (m: 3; cm: 0; ft: 2). Note on points 5.5 to 5.9 To reference OTT RLS measured values to a level zero: Input the contact gauge/staff gauge measurement, for example using the scaling function of the datalogger, connected to the OTT RLS (e. g. LogoSens 2/DuoSens).

  • Page 17: 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 RLS: The following SDI-12 standard commands are relevant for the operation of the OTT RLS: Command Response Description confirmation active a - sensor address a<CR><LF>...

  • Page 18: Advanced Sdi-12 Commands

    ±0.001 are possible. * With these commands you can scale the available measuring range of an OTT RLS to a smaller 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.

  • Page 19: Carrying Out Maintenance Work

    Carry out the following maintenance work at regular frequencies based on the local circumstances: Check the OTT RLS for dirt (e. g. thick, dewy spider's webs or insect nests can lead to impairment of the measured results). In this case, carefully clean the sensor.

  • Page 20: Searching For Disruptions/Error Correction

    Sensor correctly connected to a datalogger or peripheral device to 4 .. 20 mA input (check polarity)? ➝ Correct connection assignment. 4 .. 20 mA current loop correctly supplied through datalogger or OTT RLS (internal/external supply)? ➝ Correct connection assignment.

  • Page 21: Note About The Disposal Of Old Units

    "www.ott.com". Please take into consideration also the national implementation of the EU guideline 2002/96/EC of your country. For all other countries Dispose of the OTT RLS properly after taking out of service. Observe the regulations valid in your country for the disposal of electronic devices.

  • Page 22: Determining The Maximum Load Resistance At The 4

    The load resistance (resistor) connected to the OTT RLS must not exceed a specific maximum value. This value depends on the level of the supply voltage of the OTT RLS. If the load resistance is greater, the output current can no longer be evaluat- ed. Smaller load resistances are allowed.

  • Page 23: Technical Data

    12 Technical Data Measuring range 0.8 … 35 m 80 … 3500 cm 2.6 … 115 ft Resolution SDI-12 interface 0.001 m 1 cm 0.01 ft Measuring time 20 seconds Power supply 9.6 … 28 V DC, typ. 12/24 V DC Power consumption Measurement operation <...
  • Page 24 OTT MESSTECHNIK GmbH & Co. KG Ludwigstrasse 16 87437 Kempten · Germany Phone +49 (0)8 31 56 17- 0 +49 (0)8 31 56 17- 2 09 Document number info@ott.com 63.105.001.B.E 04-0807 www.ott.com...

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