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OTT RLS 500 Operating Instructions Manual

Radar level sensor
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Operating instructions
Radar Level Sensor
OTT RLS 500
OTT RLS 500 (HF)

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Summary of Contents for OTT RLS 500

  • Page 1 Operating instructions Radar Level Sensor OTT RLS 500 OTT RLS 500 (HF)
  • Page 2 We reserve the right to make technical changes and improvements without notice.

  • Page 3: Table Of Contents

    5.9 Connecting the OTT RLS 500 (HF) to the IP dataloggerOTT netDL using an SDI-12 or RS-485 interface 5.10 Connecting theOTT RLS 500 (HF) to the Sutron XLink 100/500 datalogger using an SDI-12- or RS-485 interface 22 5.11 Connecting the OTT RLS 500 (HF) to the Sutron SatLink 3 datalogger using an SDI-12- or RS-485 interface...

  • Page 4: Scope Of Supply

    1 Scope of supply ▶ – 1 Radar sensor OTT RLS 500 for contactless measurement of the levels of surface OTT RLS 500 water; communication protocol of the RS-485 interface, preset measured value units and accessories included in the scope of supply ➝...
  • Page 5 4 meters** 8 meters** 20 meters** 6505000292 OTT USB/SDI-12 Adapter – for temporary connection of OTT sensors with SDI-12- or RS-485 interface to a PC – USB connection cable included; USB plug A to USB plug B; 3 m Examples OTT RLS 500 –...
  • Page 6 20 m / 65 ft** RLS500-swmount Wall bracket – for mounting the OTT RLS 500 (HF) – combining the housing- and wall bracket enables to swivel mount the radar sensor – alignment to the water surface possible in two axes...

  • Page 7: Basic Safety Information

    Definition Please note: … Information that prevents potential damage or malfunction on the OTT RLS 500 (HF). 3.2 Explanation on safety information used The safety information used in these operating instructions is classified according to the nature and severity of a particular hazard. The hazard levels defined are indicated by the signal words Warning/Caution and corresponding picto- grams orange/yellow triangle in these operating instructions.

  • Page 8: Note The Following For Safe And Trouble-Free Operation Of The Ott Rls 500 (Hf)

    Further information ➝ see Chapter 5, Installing the OTT RLS 500 (HF). ▶ Only install the OTT RLS 500 (HF) in a fixed position and only direct the trans- mitting antenna downwards (sensor measuring beam must radiate downwards)! Further information ➝ see Chapter 5, Installing the OTT RLS 500 (HF), ▶...

  • Page 9: Introduction

    4 Introduction The OTT RLS 500 and OTT RLS 500 HF radar sensors are used for precise, non- contact measurement of water levels in surface waters. Operation of the OTT RLS 500 (HF) is based on FMCW radar technology. The radar sensor transmits a frequency-modulated continuous wave signal in the 77 to 81 GHz frequency range (W band).
  • Page 10 OTT RLS 500 Sensor beam Footprint Fig. 3: Example of use 2 – Instal lation of the OTT RLS 500 (HF) at an auxiliary construc- OTT RLS 500 tion, e.g. metal stand with mounting plate. Sensor beam Footprint...

  • Page 11: Installing The Ott Rls 500 (Hf)

    Danger of explosion due to spark formation and electrostatic discharge The use of the OTT RLS 500 (HF) 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 12 – Within a radius of 4 … 40 km around radio astronomical facilities: OTT RLS 500 (HF) may be installed at a maximum height of 15 m above the surrounding ground surface. Affected radio astronomical facilities in the frequency range 75 … 85 GHz:...

  • Page 13: Preparatory Activities For Accident Prevention

    Risk of falling when working at great hights and risk of drowning In many cases, installation and maintenace of the OTT RLS 500 (HF) is carried out at great hights (➝ risk of falling) and over deep/fast flowing water (➝ risk of drowning).
  • Page 14 – alignment to the water surface is possible in two axes – requires an additional wall bracket; see accessories – for details see "Fastening the swivel mount" Fig. 6: OTT RLS 500 (HF) – potential range with swivel mount. Hexagon...
  • Page 15 Fastening the swivel mount Variant A ▶ Suitable ground: concrete or masonry ▶ Fastening material: e.g. hexagon wood screws M6 x 40 + plastic dowel ▶ Dimensions housing- / wall bracket: see Annex C. ■ Make two holes (Ø 8 mm · 5/16") using a hammer drill. (use wall bracket as a template for position of holes).
  • Page 16 ■ Align the cable socket in the correct position (note the coding lug) and place it on the installation plug of the OTT RLS 500 (HF); see Fig. 8/9, step 1. ■ Tighten the union nut by hand; see Fig. 8/9, step 2.

  • Page 17: Connecting The Ott Rls 500 (Hf) To Ott Sensorlink 1000 Datalogger

    5.4 Connecting the OTT RLS 500 (HF) to OTT SensorLink 1000 datalogger Combination of radar sensor OTT RLS 500 (HF) with OTT SensorLink 1000 datalog- ger: the electrical connection is made via a factory-assembled connecting cable with M9 subminiature connectors (accessories). The connecting cable is used for both power supply and data transmission.

  • Page 18: General Information On The Supply Voltage

    The OTT RLS 500 (HF) requires a supply voltage of 5.5 … 28.8 V DC, typ. 12/24 V (e.g. via rechargeable battery or via mains connection with elec- trically isolated safety extra-low-voltage). The OTT RLS 500 (HF) is ready for operation as soon as the supply voltage is applied. Please note: ▶...

  • Page 19: Connecting The Ott Rls 500 (Hf) To Any Datalogger Using An Sdi-12 Interface

    SDI-12 interface ■ Connect the OTT RLS 500 (HF) to an SDI-12 input of the datalogger. To do so, follow the operating instruction of the datalogger. Refer to Fig. 4 for the con- nection assignment of the OTT RLS 500 (HF); wires used: red, blue, and grey.

  • Page 20: Connecting The Ott Rls 500 (Hf) To Any Datalogger/Electronic Control Using An Rs-485 Interface

    Connect the OTT RLS 500 (HF) to an RS-485 input of the datalogger/an electronic control. To do so, follow the operating instruction of the datalogger/electronic control. Refer to Fig. 5 for the connection assignment of the OTT RLS 500 (HF); wires used: red, blue, green and yellow. The maximum total cable length is 1000 m ·...

  • Page 21: Connecting The Ott Rls 500 (Hf) To The Ip Dataloggerott Netdl Using An Sdi-12 Or Rs-485 Interface

    (point-to-point connection)! ■ Connect the OTT RLS 500 (HF) to the IP datalogger OTT netDL as shown in Fig. 12 (right). Also follow the operating instructions of the OTT netDL. Variant B: Connecting the OTT RLS 500 (HF) using a physical RS-485 interface (SDI-12 protocol via physical RS-485 interface).

  • Page 22: Connecting Theott Rls 500 (Hf) To The Sutron Xlink 100/500 Datalogger Using An Sdi-12- Or Rs-485 Interface

    5.10 Connecting theOTT RLS 500 (HF) to the Sutron XL 100/500 datalogger using an SDI-12- or RS-485 interface Variant A: Connecting the OTT RLS 500 (HF) using an SDI-12 interface (proto- col and physical interface: SDI-12). The maximum cable length is 200 m (point-to-point connection)! ■...

  • Page 23: Connecting The Ott Rls 500 (Hf) To The Sutron Satlink 3 Datalogger Using An Sdi-12- Or Rs-485 Interface

    5.11 Connecting the OTT RLS 500 (HF) to the Sutron S 3 dat- alogger using an SDI-12- or RS-485 interface Variant A: Connecting the OTT RLS 500 (HF) using an SDI-12 interface (proto- col and physical interface: SDI-12). The maximum cable length is 200 m (point-to-point connection)! ■...

  • Page 24: Configuring/Testing The Ott Rls 500 (Hf)

    6 Configuring/testing the OTT RLS 500 (HF) The OTT RLS 500 (HF) is immediately ready for operation with the standard con- figuration provided by factory settings. In this case, the radar sensor operates – depending on the variant code ordered (see Chapter 2) with the factory settings (see Chapter 7).
  • Page 25 Fig. 15: Changing the facotry configuration of an OTT RLS 500 (HF) via SDI-12 commands using the "OTT USB/SDI-12 adapter". OTT USB/SDI-12 adapter USB-connection cable +12 V RS-485 B RS-485 A SDI-12...

  • Page 26: Sdi-12 Commands And Responses

    7 SDI-12 commands and responses Communication with the OTT RLS 500 (HF) is carried out either via the physical SDI-12 interface or via the RS-485 interface via the SDI-12 transmission protocol. This technical documentation contains a detailed description of the SDI-12 commands implemented in the SDI-12 transmission protocol.
  • Page 27 OTT RLS 500 (HF) sums up the status values. Example: +80 ➝ radar sensor is pointing upwards (+16) + relative humidity in the probe housing was/is above limit value (+64); values ≥ +128: exclusively for internal service purposes value range 0 …...
  • Page 28 Meta data commands ▶ aIM! Determine response to the corresponding command aM! (does not start a measurement) … aM1! aIM1! aIM3! … aM3! aIMC! … aMC! … aMC1! aIMC1! aIMC3! … aMC3! aIC! … aC! … aC1! aIC1! aIC3! … aC3! aICC! …...
  • Page 29 RS-485 interface: Modbus (RTU) read parity factory setting: +3 ➝ even, 1 Stoppbit ▶ aXXD<value>! for device variant OTT RLS 500 HF: set sampling rate of distance measurement for device variant OTT RLS 500 HF: read sampling rage of distance measurement aXXD!

  • Page 30: Standard Commands

    – manufacturer's identification (company name) – sensor identification mmmmmm – sensor version (here firmware version) xxxxxxxxxxxxx – additional identification (in this case serial number; max. 13 characters) OTT RLS 500 (HF) response: 014OTTHYDRORLS500100… …xxxxxxxxxx aAb! b<CR><LF> Change sensor address a – old sensor address b –...
  • Page 31 – time in seconds until the sensor provides the measurement result response OTT RLS 500 (HF): 0/2 … 61 sec. – number of measured values response OTT RLS 500 (HF): 3 (only level mea- surement) or 4 (with discharge calculation) change sensor orientation intended (e.g.
  • Page 32 CRC value: a<value1><value2><value3>… …<value4><CRC><CR><LF> a<value1><value2><value3>… aR0! The OTT RLS 500 (HF) continually measures the water level …<value4><CR><LF> and optionally calculates the discharge. This command per- mits to retrieve measurement results even without the combi- nation of commands aM!/aD0!; for details see command aD0! after aM!.
  • Page 33 Command Response Description aRC0! a<value1><value2><value3>… The OTT RLS 500 (HF) continuously measures the water level …<value4><CRC><CR><LF> and optionally calculates the discharge and requests a CRC value (Cyclic Redundancy Check). This com- mand permits to retrieve measurement results, even without the combination of commands aM!/aD0! ; for details, see command aD0! after aM!.
  • Page 34 Command Response Description aR1! a<value1><value2><value3>… The OTT RLS 500 (HF) continuously measures the water level …<value4><value5><value6>… and determines statistical values. This command permits to …<value7><value8><CR><LF> retrieve measurement results, even without the combination of commands aM1!/aD0! … aD2! ; for details, see com- mand aD0! …...
  • Page 35 … aD2! command is extended by a CRC value: a<valueX><valueX><valueX>……<CRC><CR><LF> a<value1><value2><value3>… aR3! The OTT RLS 500 (HF) continuously measures the water level …<value4><value5><value6>… and determines meta data. This command permits to retrieve …<value7><value8><CR><LF> measurement results, even without the combination of com- mands aM3!/aD0! …...
  • Page 36 CRC (Cyclic Redundancy Check) – sensor address – time in seconds until the sensor has determined the measurement result response OTT RLS 500 (HF): 0/2 … 61 sec. – number of measured values response OTT RLS 500 (HF): 17 aDB0!

  • Page 37: Meta Data Commands

    "Start system test" (aV!). This command does not start a sys- tem test! For a description of the response, see command aV!. a,<field1>,<field2>,… aIM_00X! The OTT RLS 500 (HF) sends meta data for the related mea- …<field3>;<CRC><CR><LF> sured value <valueX> in the form of three data fields.
  • Page 38 Command Response Description (Continuation of description of previous pagee) <field3> – textual description Last ring buffer level Mean level Min. level Max. level Median level Standard deviation level Signal quality indicator Relative signal strength Inside humidity Inside dew point Inside temperature Current orientation, x-Axis Current orientation, y-Axis Stored orientation, x-Axis...

  • Page 39: Advanced Sdi-12 Commands

    7.4 Advanced SDI-12 commands Command Response Description ▶ Set/read the unit of measured water level values aXSU<value>! a<value><CR><LF> Set unit aXSU! a<value><CR><LF> Read unit – sensor address – +0: m <value> +1: cm +4: mm +2: ft +3: inch factory setting: m or ft ▶...
  • Page 40 Factory setting: +9000.000 (depth measurement); –9000.000 (level measurement) If the level/depth measurement value falls below/exceeds this limit value, the OTT RLS 500 (HF) outputs the device sta- tus +4. The limit value can be used for bottom detection of the water body.
  • Page 41 Continuous measurement, interval mode: In interval mode samplings take place continuously one after the other. The OTT RLS 500 (HF) immediately responds to an aRx! command with a measured value (with the exception of the first interval after the start). This value is always updat- ed after the averaging time has expired.
  • Page 42 Reference value = +1.500 (HF) m Output = +1.500 (HF) m (Offset calculated by theOTT RLS 500 (HF) and applied to all other measured values = +0,600 m) Notes – A subsequent change of the unit (aXSU<value>!) may result in rounding errors of ±0.001.
  • Page 43 Command Response Description ▶ Reset/read all units to default (metric or imperial) aXSR<value>! a<value><CR><LF> Reset units to default aXSR! a<value><CR><LF> Read default units – sensor address – +0: metric <value> +1: imperial +2: individual customer setting (only for reading) This command resets all – potentially individually changed – units to metric or imperial values (according to the delivery state).
  • Page 44 Command Response Description ▶ Create table entry in rating table (calculation method rating table) aXDA<value1>… a<value1><value2><CR><LF> Create table entry …<value2>! – sensor address <value1> – water level at related discharge <value2> – discharge at related water level Notes: – precondition: calculation method rating table activated –...
  • Page 45 This command deletes a rating table completely. Note: – precondtion: calculation method rating table activated and at least one table entry is available. ▶ For device variant OTT RLS 500 HF: set/read sampling rate of distance measurement aXXD<value>! a<value><CR><LF> Set sampling rate of distance measurement aXXD! a<value><CR><LF>...
  • Page 46 Command Response Description ▶ RS-485 interface: set/read Modbus (RTU) address aXCA<value>! a<value><CR><LF> Set Modbus (RTU) address aXCA! a<value><CR><LF> Read Modbus (RTU)address – sensor address <value> – +bbb Input/output without leading zeros! Value range: +1 … +247 Factory setting: +1 Note: Modbus transmission parameters are changed imme- diately;...

  • Page 47: Rs-485 Interface With Modbus Protocol (Rtu)

    15 14 13 12 11 10 9 IEEE 754 Fraction least float32 range: see IEEE 754 String value Modbus Register Byte 9 10 11 12 13 14 15 E spc S NULL Remark: The OTT RLS 500 (HF) has only one "Holding Register" Block.

  • Page 48: Sensor Description Register

    32 OTT HydroMet device assignment starting with register number 41001 and beginning with the 32-bit OTTP identifier. This enables the detection of devices that are compatible with the OTT HydroMet Modbus protocol. ▶ ID protocol- 3 (2) uint 16 0x0001 "Common Block"...
  • Page 49 Register - Acces min. / Register name number Data type Length mode max. Description ▶ Channel 3 – unit 28 (27) uint 16 compare "Channel 1: unit string" string ▶ Channel 4 – definition 31 (30) uint 16 Minimum level value within the of physical element averaging time HA, Height of reading (0x4841)
  • Page 50 Register - Access min. / Register name number Data type Length mode max. Description ▶ Channel 8 – definition 51 (50) uint 16 Device status of physical element OS, Status of device (0x4f53) ▶ Channel 8 – unit 52 (51) uint 16 0x0001: none ▶...

  • Page 51: Register Of Sensor Values

    Register - Acces min. / Register name number Data type Length mode max. Description ▶ Channel 14 – defini- 81 (80) uint 16 saved sensor orientation X-axis tion of physical 0x0001: not defined element ▶ Channel 14 – unit 82 (81) uint 16 0x0010: degree ▶...

  • Page 52: Configuration Register

    Setting Modbus (RTU) transmission speed (baud rate) Modbus (RTU) parity 315 (314) uint 16 Setting Modbus (RTU) parity For OTT RLS 500 HF: Sampling 317 (316) float 32 Setting the sampling rate of the rate of the distance measurement distance measurement...
  • Page 53 The entries in the rating table can be set using the following two tabs. The value table is sorted in ascending order, therefore it is not possible to write directly into the value table. With the aid of the two registers, the OTT RLS 500 (HF) controls the cor- rect insertion of the values into the rating table.

  • Page 54: Carrying Out Maintenance Work

    9 Carrying out maintenance work The OTT RLS 500 (HF) radar sensor is almost maintenance free. No setting or cali- bration work is necessary. Likewise, there are no parts that need replacing regu- larly. Carry out the following maintenance work at regular frequencies based on the local circumstances: ■...

  • Page 55: Troubleshooting

    10 Troubleshooting Sensor does not respond to the SDI-12 interface ▶ If present: Is the fuse in the power supply line defective? ➝ Replace fuse. ▶ Sensor correctly connected to a datalogger with SDI-12 input? ➝ Correct connection assignment. ▶ Polarity of the power supply reversed? ➝...

  • Page 56: Repair

    +49 831 5617-489 repair@ott.com Please note: Only have a defective OTT RLS 500 (HF) checked and repaired by the OTT HydroMet repair center! Never make any repairs yourself under any cir- cumstances! Only a qualified repair followed by a final factory test guarantees the specified measuring accuracy.

  • Page 57: Technical Data

    ±3 % rH (0 … 100 % rH) Units % rH Sampling range OTT RLS 500 2 Hz OTT RLS 500 HF 2 Hz · 4 Hz · 8 Hz Measurement interval 1 … 60 seconds Supply voltage 5.5 … 28.8 V , typ.
  • Page 58 Materials Housing AlMgSi1, ASA (UV-stabilised ABS) Radom (front plate) TFM PTFE Mounting 1.4301 (V2A) Cable Weight (without mounting) approx. 0.75 kg · approx. 1.5 pounds Terminal assignment connection/connecting cable Power supply yellow RS-485 B green RS-485 A grey SDI-12 DATA blue GND (ground) Rotation range of swivel mount...

  • Page 59: Annex A - Dimensions Housing- / Wall Bracket

    Annex A – Dimensions housing- / wall bracket OTT RLS 500 (HF) with housing- and wall bracket 67.5 134.5 OTT RLS 500 (HF) with housing bracket 134.5 all measures in mm...

  • Page 60: Annex B - Definition Of X-/Y-Axes And Direction Of Rotation

    Annex B – Definition of X-/Y-axes and direction of rotation X-axis – 0° Y-axis – 0° example rotation shown in the figure...

  • Page 61: Annex C - Note On Declaration Of Conformity

    If required, you can download the current version of the Declaration of Conformity for the OTT RLS 500 (HF) as pdf file from our website: "www.otthydromet.com". Annex D – Declaration of Health If required, you can download the current version of the Declaration of Health for the OTT RLS 500 (HF) as pdf file from our website: "www.otthydromet.com".
  • Page 64 OTT HydroMet GmbH Ludwigstrasse 16 87437 Kempten · Germany Telephone +49 831 5617-0 +49 831 5617-209 Docment number euinfo@otthydromet.com 63.110.001.B.E 03-0125 www.otthydromet.com...

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