Ott Hydromet OTTRLS Radar Level Sensor User Manual Anleitung RLS Zul EN

Ott Hydromet GmbH Radar Level Sensor Anleitung RLS Zul EN

User Manual

EnglishOperating instructionsRadar Level SensorOTT RLS
We reserve the right to make technical changes and improvements without notice.
3Table of contents1 Scope of supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 Order numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Basic safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Installing the OTT RLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85.1 Criteria for selecting a suitable mounting location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85.2 Notes on power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.3 Suitable cable types when using the RS-485 interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.4 Mounting the OTT RLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.5 Connecting the OTT RLS to any datalogger using an SDI-12 interface . . . . . . . . . . . . . . . . . . . 115.6 Connecting the OTT RLS to any datalogger using a 4 … 20 mA interface . . . . . . . . . . . . . . . . 115.7 Note on using the OTT RLS RS-485 interface in combination with any datalogger . . . . . . . . 115.8 Connecting the OTT RLS to LogoSens 2 or DuoSens using an SDI-12 or RS-485 interface . 125.9 Connecting the OTT RLS to LogoSens 2 or DuoSens using a 4 … 20 mA interface . . . . . . . . 146 SDI-12 commands and responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176.1 Standard commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186.2 Advanced SDI-12 commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197 Carrying out maintenance work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198 Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 Searching for disruptions/error correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2010 Note about the disposal of old units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2111 Determining the maximum load resistance at the 4 … 20 mA interface . . . . . . . 2212 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1 Scope of supplyᮣOTT RLS – 1 Radar sensor OTT RLS, two part gimbal-mounting (consisting of device andwall 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– 1 Operating instructions– 1 Factory acceptance test certificate (FAT)2 Order numbersᮣOTT RLS Radar sensor OTT RLS 63.105.001.9.2– Version 1: 4 … 20 mA + RS-485 interface – Version 2: 4 … 20 mA + SDI-12 interface4
3 Basic safety informationᮣRead these operating instructions before using the OTT RLS for the first time!Make yourself completely familiar with the installation and operation of theOTT RLS! Retain these operating instructions for later reference.ᮣThe OTT RLS is used for contactless level measurement of surface waters. Onlyuse the OTT RLS in the manner described in these operating instructions! Forfurther information ➝ see Chapter 4, "Introduction".ᮣNote all the detailed safety information given within the individual work steps.All safety information in these operating instructions are identified with thewarning 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".ᮣNote that the OTT RLS may only be installed by a professional (e.g. qualifiedelectrician). For further information ➝ see Chapter 5, "Installing the OTT RLS".ᮣProtect the power supply connection with a fuse (5 ampere, blowing speed:fast). For further information ➝ see Chapter 5, "Installing the OTT RLS".ᮣIt is essential to comply with the electrical, mechanical and climatic specifi-cations given in the Technical Data section. For further information ➝ seeChapter 12, "Technical data".ᮣDo not make any changes or retrofits to the OTT RLS. If changes or retrofits aremade, all guarantee claims are voided. Furthermore, the radio approval requiredfor its operation is void!ᮣHave a faulty OTT RLS inspected and repaired by our repair center. Nevermake any repairs yourself under any circumstances. For further information➝ see Chapter 8, "Repair".ᮣDispose of the OTT RLS properly after taking out of service. Never put theOTT RLS into the normal household waste. For further information ➝ seeChapter 10, "Note about the disposal of old units".FCCNote: This equipment has been tested and found to comply with the limits for aClass A digital device, pursuant to part 15 of the FCC Rules. These limits aredesigned to provide reasonable protection against harmful interference when theequipment is operated in a commercial environment. This equipment generates,uses, and can radiate radio frequency energy and, if not installed and used inaccordance with the instruction manual, may cause harmful interference to radiocommunications. Operation of this equipment in a residential area is likely tocause harmful interference in which case the user will berequired to correct theinterference at his own expense.Industry CanadaThis Class A digital apparatus complies with Canadian ICES-003.Cet appareil numérique de la classe A est conforme à la norme NMB-003 duCanada.5
4 IntroductionThe 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 antennatransmits short radar pulses in the 24 GHz ISM band. The separate receiverantenna receives the pulses reflected from the water and uses them to determinethe distance between sensor and water surface: the time taken by the radar pulsesfrom transmission to reception is proportional to the distance between sensor andwater surface. The actual water level of the waterway is then calculated using ascaling function by a datalogger attached to the radar sensor. For this a referencelevel has to be input when starting.The transmission antenna has a beam width of approx. ± 6°. The resulting sensorbeam can be seen in the depiction in Figures 2 and 3.Three standardised electrical interfaces are available for connecting the OTT RLSto a datalogger or peripheral devices: 4 … 20 mA, SDI-12 and RS-485 (SDI-12protocol).A gimbal mounting allows problem-free and simple mounting even on slantedsurfaces. A waterproof terminal area can be found under a removable screwcover for attaching the sensor cable.Due to the low power consumption, a cable length of up to 1000 meters can beimplemented for the power supply.The complete radar sensor is constructed to be proof against flooding (diving bellprinciple).Removablescrew coverCover for transmission and receiving antenna (radom)Gimbal mountingFig. 1: Overview of radar sensor OTT RLS.6
OTT RLSSensor beamFig. 3: Application example 2: Mounting the OTT RLS on an auxiliaryconstruction, e.g. metal stand withmounting plate.OTT RLSSensor beamFig. 2: Application example 1: Mounting the OTT RLS on a bridge.The projection of the sensor beam onto thewater surface is virtually round.7
5 Installing the OTT RLS Caution: The installation of the OTT RLS may only be undertaken by qualifiedpersons (e.g. electrician)!The OTT RLS has no Ex protection!5.1 Criteria for selecting a suitable mounting locationᮣLocations that come into question include, for example, bridges and auxiliaryconstructions directly above the waterway section to be measured.ᮣThe minimum distance between lower edge of the sensor and water surfacemust be 0.8 m (dead area in which no useable measurement is possible).ᮣSelect a mounting point high enough so that measurement is possible even withhigh water levels.ᮣThe mounting point must be steady. Vibrations and movement of the mountingpoint must be avoided. Bridges are affected by movements of several centime-ters as a result of load changes and temperature movements.ᮣThe water surface must be as smooth as possible in the area of the sensorbeam. Avoid turbulent areas and areas where obstructions in the waterway orbridge piers cause changes in the water level.ᮣThe area within the sensor beam (see Figures 2 and 3) must be completely freeof obstructions. Table for approximating the size of the sensor beam:Distance DiameterOTT RLS – Sensor beamWater surface5 m 1.06 m10 m 2.12 m15 m 3.19 m20 m 4.25 m25 m 5.31 m30 m 6.38 m35 m 7.44 mThe diameters given are minimum sizes. Where possible, select an area free ofobstruction that is clearly larger.ᮣAvoid large metal surfaces near the sensor beam (reflections from these surfacescan distort the measurement result).ᮣThe climate specifications in the technical data must be kept to at the mountinglocation.ᮣStilling wells are unsuitable as a mounting location.WARNING Danger of explosion due to spark formation and electrostaticdischargeThe use of the OTT RLS in explosive atmospheres can lead to the danger of ignitionof this atmosphere. An explosion resulting from this involves the risk of very severematerial and personal damage.ᮣNever operate the OTT RLS in explosive areas (e.g. in sewers).8
5.2 Notes on power supplyThe OTT RLS requires a power supply of 9.6 … 28 V direct current of type12/24 V DC (e.g. a battery or mains connection with galvanically isolated lowsafety voltage).The OTT RLS is immediately ready for operation after connecting the power supply.Warning:ᮣThe power supply must be protected by a fuse (5 ampere, blowing speed: fast)on the input side.ᮣWhen using solar panels, we recommend the use of an overvoltage protectiondevice.5.3 Suitable cable types when using the RS-485 interfaceThe maximum length of the cable is 1,000 m. Recommended cable type: Twisted-pair cable; unshielded (alternatively: shielded). The wires intended for the powersupply can be twisted pair, but do not have to be.ᮣup to 400 m cable length: 2 x 2 x 0.34 mm2e.g. Lapp UNITRONIC FD CP (TP) plus UL/CSA*, item no. 0030928; external diameter 8.8 mmᮣ400 … 600 m cable length: 2 x 2 x 0.5 mm2e.g. Lapp UNITRONIC FD CP (TP) plus UL/CSA*, item no. 0030937; external diameter 9.3 mmᮣ600 to 1,000 m cable length: 2 x 2 x 0.75 mm2e.g. Lapp UNITRONIC FD CP (TP) plus UL/CSA*, item no. 0030946; external diameter 10.2 mm* The outer casing of these cables is UV-steady and therefore ideally suitable for the external area. It isnot necessary to attach the screen at these cable examples.5.4 Mounting the OTT RLSAssembling the gimbal mountingMounting surface: concrete or masonryⅥMake four holes (Ø 8 mm/43 mm) deep using a hammer drill (use wall brack-et as a template).ⅥInsert the four plastic plugs supplied into the holes.ⅥAttach the wall bracket using the four wood screws supplied.ⅥInsert housing bracket (without sensor) into wall bracket and lightly tighten thehex bolts A.Mounting surface: auxiliary construction, e. g. metal stand with mounting plateⅥDrill four holes (Ø 7 mm) in the mounting plate (use wall bracket as a template).ⅥAttach the wall bracket e. g. using four hex bolts (M6) and nuts.ⅥInsert housing bracket (without sensor) into wall bracket and lightly tighten thehex bolts A.Preparing the cable glandⅥRemove "Globemarker" (hexagon with size indication of cable diameters thatcan be used).ⅥWith a cable diameter of 7.0 … 11.0 mm, remove inlet: insert screwdriververtically into the seam. See Figure 4. Minimum cable diameter with inlet:4.0 mm.ⅥLever out inlet with screwdriver.ⅥInsert cable.9
Mounting the sensorⅥUnscrew screw cover.ⅥInsert connecting cable through cable gland.ⅥRemove insulation from connecting cable.ⅥWith flexible wires: put end caps on the wires.ⅥConnect the connecting cable to the terminal block. Take note for this of Chapter5.5 to 5.9! If required, the terminal strip can be pulled out for connecting.ⅥRetighten connecting cable as necessary.ⅥTighten the tightening nut of the cable gland (torque for tightening nut: 6 Nm).ⅥScrew on the screw cover and tighten firmly by hand.ⅥInsert sensor into housing bracket and lightly tighten the hex bolts B.ⅥAlign the housing parallel (longitudinal and lateral axis) with the water surfaceusing a spirit level.ⅥTighten the hex bolts B on the housing shell.ⅥTighten the hex bolts A on the wall and housing brackets.ⅥCheck alignment of the OTT RLS once more.Warning:ᮣThe alignment of the sensor parallel to the water surface must be carried out asaccurately as possible!➝If alignment is out by 1.0 °, this leads to a linearity error of approx.0.15 mm per meter change in the distance.➝If alignment is out by 2.5 °, this leads to a linearity error of approx. 1 mmper meter change in the distance.➝If alignment is out by 5 °, this leads to a linearity error of approx. 4 mm permeter change in the distance.ᮣEnsure no moisture enters the connection area when the screw cover is open!Removablescrew coverCable glandScrewterminal stripSensorCable glandInletConnectingcableGlobemarkerFig. 4: OTT RLS – connection area.10
5.5 Connecting the OTT RLS to any datalogger using an SDI-12interfaceⅥConnect the OTT RLS to an SDI-12 input of the datalogger. Follow the datalog-ger handbook as you do this. Refer to Figure 6 for the connection assignmentsof the OTT RLS.5.6 Connecting the OTT RLS to any datalogger using a 4 … 20 mAinterfaceⅥConnect 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.Refer to Figure 7 for the connection assignments of the OTT RLS. Contacts used:1, 4, 5 and 7.5.7 Note on using the OTT RLS RS-485 interface in combinationwith any dataloggerThe RS-485 interface can only be used with an OTT datalogger. In this case, thetransmission protocol via the physical RS-485 interface is the SDI-12 protocol.Connect OTT RLS via the RS-485 interface to the OTT LogoSens/DuoSens ➝ seeChapter 5.8, Method B.+12 VGNDSDI-12 DATA5423176RLSAbb. 6: Connecting the OTT RLS to anydatalogger using an SDI-12 interface.max. ±90 °Hexbolt A Hex bolt BWallbracket Housing bracketmax. ±15 °Fig. 5: OTT RLS – rotation rangeof gimbal mounting.11
5.8 Connecting the OTT RLS via SDI-12 or RS-485 interface toLogoSens 2 or DuoSensMethod A: Connecting the OTT RLS via the SDI-12 interface (protocol and phys-ical interface: SDI-12). The maximum length of the cable is 70 m. Recommendedcable cross-section: 0.25 mm2:ⅥConnect the OTT RLS to the LogoSens 2 Station Manager or to the DuoSensCompact Datalogger as shown in Figure 8. Take note of the operating instruc-tions for the LogoSens 2/DuoSens.SDI-12InputA … R4312 LogoSens 2SDI-12InputA4312 DuoSensRLS5423176RLS5423176+9,6 … 28 VGND+9,6 … 28 VGNDFig. 8: Connecting the OTT RLS to LogoSens2 or DuoSens using an SDI-12 interface.The letters above the screw terminal stripidentify the possible connections on theLogoSens 2/DuoSens.4 … 20 mA +4 … 20 mA –GNDRS-485 B *RS-485 A *SDI-12 DATA* SDI-12 protocol via physical RS-485 interface(for connecting to OTT DuoSens and OTT LogoSens)5423176+9,6 … 28 VFig. 7: OTT RLS screw terminal strip.Please note: The 4 … 20 mA interfacecannot be used parallel to the SDI-12or RS-485 interfaces.12
Method B: Connect OTT RLS using the physical RS-485 interface (SDI-12 proto-col via physical RS-485 interface). Refer to Chapter 5.3 for the maximum cablelength and the recommended cross-section of the cable:ⅥConnect the OTT RLS to the LogoSens 2 Station Manager or to the DuoSensCompact Datalogger as shown in Figure 9. Take note of the operating instruct-ions for the LogoSens 2/DuoSens.Configuring the LogoSens 2/DuoSens for the OTT RLS with SDI-12interfaceⅥCreate a LogoSens 2/DuoSens channel with SDI-12 Masteror OTT SDI RS485function block (serial sensorstab).ⅥApply the following settings:ᮣTerminal block LogoSens 2: A … R DuoSens SDI-12 Master: A 3-4 (specified) DuoSens OTT SDI RS485: A 1-2 (specified)terminal block used (screw terminal strip) of theLogoSens 2/DuoSens.Fig. 10: Adjusting the operating parametersof the LogoSens 2/DuoSensSDI-12 Master function block.The function block OTT SDI RS485is set in the same way.RS-485InputA … R4312 LogoSens 2RS-485InputARLS4312 DuoSensRLS54231765423176GND+9,6 … 28 VGND+9,6 … 28 VFig. 9: Connecting the OTT RLS to LogoSens2 or DuoSens using an RS-485 interface(SDI-12 protocol).The letters above the screw terminalstrip identify the possible connectionson the LogoSens 2/DuoSens.13
ᮣSlave address SDI-12 bus address. Each slave address may onlybe allocated once to an SDI-12 bus line. (check-ing/setting: see operating instructions LogoSens2/DuoSens, Chapter SDI-12 transparent mode.)Typical setting: 0(only one OTT RLS is connectedto the terminal block; no bus operation).ᮣValue no. identifies which value (the xth of nvalues) of theOTT RLS is recorded in this channel. Typical set-ting:1(first of three values: level in [m])ᮣMeasurement modeM!(for the maximum 3 values + status informationof the OTT RLS).ᮣAllocation of the other two measured values + statusinformation of the OTT RLS to virtual terminals(level in [cm]; level in [ft]; status information; seeChapter 6.1 for further information; commandaM!).ⅥIn the relevant Channelfunction blocks, adjust the required units and number ofdigits 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 thefunction block SDI-12 Masteror OTT SDI RS485as the input signal. The otherchannels each contain a function block Virtual Sensor(V02 to V04) as the inputsignal. Naturally, just individual channels can be recorded. In this case, there arefewer entries required in the Value no./Virtual terminal IDfield.Please note: The measuring time is approx. 20 seconds.5.9 Connecting the OTT RLS to LogoSens 2 or DuoSens using a4 … 20 mA interfaceⅥConnect the OTT RLS to the LogoSens 2 Station Manager or to the DuoSensCompact Datalogger as shown in Figure 11 and 12. Take note of the operatinginstructions for the LogoSens 2/DuoSens. Maximum cable length/recommendedcable cross-section: Ensure that the ohm cable resistance together with any resis-tor present does not exceed the maximum permitted load resistance (seeChapter 11)!Value no./Virtual terminal ID14
4 … 20 mAInputC … F*43125423176 DuoSensRLS* only with a DuoSenswith analog extension4 … 20 mAInputC … F*43125423176 DuoSensRLSGND+9,6 … 28 VFig. 12: Connecting the OTT RLS to Duo-Sens using a 4 … 20 mA interface.The letters above the screw terminalstrip identify the possible connectionson the DuoSens.The supply to the current loop inthe application case shown on theleft is via the OTT RLS.4 … 20 mA InputA … R4312 LogoSens 2RLS5423176100 Ohm resistorFig. 11: Connecting the OTT RLS toLogoSens 2 using a 4 … 20 mA interfaceUse the 100 Ohm OTT resistor(order number: 55.550.126.4.2)!The letters above the screw terminalstrip identify the possible connectionson the LogoSens 2.The supply to the current loop in the applica-tion case shown is via the OTT LogoSens 2.15
Configuring the LogoSens 2/DuoSens for OTT RLS with 4 … 20 mAinterfaceⅥCreate a LogoSens 2/DuoSens channel with function block I 4-20 mA(LogoSens 2) orU/I/Pt100/…(DuoSens) (Analog sensors tab).ⅥApply the following settings:ᮣTerminal block LogoSens 2: A … R DuoSens: C ... F ter-minal block used (screw terminal strip) ofthe LogoSens 2/DuoSens.ᮣSet to I 4-20 mA ext.ᮣSensor lag time (s) switches on the LogoSens 2/DuoSens input1 second before the actual measurementprocessᮣif required: record error codes on rangeoverflowᮣnot required with an OTT RLSⅥInsert a 2-point scalingfunction block into this channel and set the appropriatewater levels for the electrical values measured (e. g. Point 1: 4 ➝35; Point 2:20 ➝0).ⅥIn the Channelfunction block, set the unit and number of digits after the decimalplace (m: 3; cm: 0; ft: 2).Note on points 5.5 to 5.9ᮣTo reference OTT RLS measured values to a level zero: Input the contactgauge/staff gauge measurement, for example using the scaling function of thedatalogger, connected to the OTT RLS (e.g. LogoSens 2/DuoSens).Auxiliary sensor supply viarelay contact at terminal block(only for LogoSens 2)□Error code if range overflowMeasurement mode(only with DuoSens)Fig. 13: Setting operating parameters of theLogoSens 2 I 4-20 mAfunction block.The DuoSens function block U/I/Pt100/…is set in the same way.16
6 SDI-12 commands and responses6.1 Standard commandsAll SDI-12 standard commands are implemented in the OTT RLS: The following SDI-12 standard commands are relevant forthe operation of the OTT RLS:Command Response Descriptiona! a<CR><LF> confirmation active a- sensor addressaI! allccccccccmmmmmm… send identification…vvvxxxx<CR><LF> a – Sensor addressll – SDI-12 protocol version cccccccc – manufacturer's identification (companyname)mmmmmm – sensor identification vvv – sensor version xxxxxx – serial numberOTT RLS reply= 13OTT HACH...RLS100xxxxxxaAb! b<CR><LF> change address a– old sensor address b– new sensor address?! a<CR><LF> query address a– sensor addressaM! atttn<CR><LF> start measurementa– sensor addressttt – Time in seconds until the sensor has deter-mined the measurement result OTT RLS reply = 20 secondsn– number of measured values OTT RLS reply = 7aD0! … aD6! a<value><CR><LF> send data a– sensor address D0: level [m] <value> – pbb.aaaD1: level [cm] <value> – pbbbbD2: level [ft] <value> – pbbb.aaD3: status <value> – b 0 = measured value OK 1 = no target recognized 2 = internal error 3 = variance of individual measurements too large<value> = p– sign (+,–) b– digit (before the decimal point) a– digit after the decimal pointMore information on the SDI-12 standard commands can be found in the document SDI-12; A Serial-Digital Interface Standardfor Microprocessor-Based Sensors; Version 1.3(see Internet pagewww.sdi-12.org).17
6.2 Advanced SDI-12 commandsAll advanced SDI-12 commands begin with an "O" for OTT. With these commands, it is possible to configure the OTT RLSusing the transparent mode of a datalogger.Command Response Descriptionᮣ4 … 20 mA interface – adjusting/reading unit of the measured values *aOPF<value>! aOPF<value><CR><LF> adjust unit for the commands „adjusting/reading thelower/upper limit “.aOPF! aOPF<value><CR><LF> read unit for the commands „adjusting/reading thelower/upper limit “.a– sensor address<value> – 0 = m1 = cm2 = ftᮣ4 … 20 mA interface – adjusting/reading the lower limit *aOPA<value>! aOPA<value><CR><LF> adjust lower limitaOPA! aOPA<value><CR><LF> read lower limita– sensor address<value> – pb.ap– sign (+,–)b– digits before the decimal pointb– digits after the decimal pointNumber of positions: max. 6 (5 digits + decimal point)Note the following settings for the unitsm ➝pbb.aaa input in m (+0.000 … +35.000)cm ➝pbb.aaa input in m (+0 … +3500)ft ➝pbb.aaa input in feet (+0.00 … +115.00)Note: When switching between m ➝ft ➝m, roundingerrors of ±0.001 are possible.ᮣ4 … 20 mA interface – adjusting/reading the upper limit *aOPB<value>! aOPB<value><CR><LF> adjust upper limitaOPB! aOPB<value><CR><LF> read upper limita– sensor address<value> – pb.ap– sign (+,–)b– digits before the decimal pointb– digits after the decimal pointNumber of positions: max. 6 (5 digits + decimal point)Note the following settings for the unitsm ➝pbb.aaa input in m (+0.000 … +35.000)cm ➝pbb.aaa input in m (+0 … +3500)ft ➝pbb.aaa input in feet (+0.00 … +115.00)Note: When switching between m ➝ft ➝m, roundingerrors of ±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 notrequire the whole measuring range, this has the advantage that a higher resolution for the 4 … 20 mA interface can beachieved. Example: 16 mA measurement span stands for 2 m of water level change available (e.g. lower limit = +14,000 m;upper limit = +16,000 m).18
7 Carrying out maintenance workThe OTT RLS radar sensor is almost maintenance free. No setting or calibrationwork is necessary. There are likewise no parts that need replacing regularly.Carry out the following maintenance work at regular frequencies based on thelocal circumstances:ⅥCheck the OTT RLS for dirt (e.g. thick, dewy spider's webs or insect nests canlead to impairment of the measured results). In this case, carefully clean thesensor. At the same time, ensure that the setting of the gimbal mounting doesnot change.ⅥCheck for obstructions in the measurement beam (for example, for flotsam orbranches of trees and bushes growing into this area). In this case, remove allobstructions.ⅥCheck the plausibility of the measured values by comparing with a second sensoror with a staff gauge.Warning: Never open the housing of the OTT RLS (exception: connection area)!There are no adjustment or operating elements inside the housing.8 RepairⅥ With a device defect, use Chapter 9 , Searching for disruptions/error correctionto see if you can resolve the problem yourself.Ⅵ In case of device defects, please contact the repair center of OTT:OTT MESSTECHNIK GmbH & Co. KG Repaircenter Ludwigstraße 16 87437 Kempten · Germany. Telephone +49 (0)831/5617-433 Fax +49 (0)831/5617-439 repair@ott.comWarning: Only have a defective OTT RLS checked and repaired by the OTTrepair center. Never make any repairs yourself under any circum-stances. Any repairs or attempted repairs carried out by the cus-tomer will result in the loss of any guarantee rights.19
9 Searching for disruptions/error correctionSensor does not respond to the SDI 12 interfaceᮣFuse in the power supply input side defective? ➝Replace fuse.ᮣSensor correctly connected to a datalogger with SDI-12 input (master)? ➝Correct connection assignment.ᮣPolarity of the power supply reversed? ➝Correct connection assignment.ᮣPower supply < 9.6 V or > 28 V? ➝Correct level of voltage supplied (check the length and cross-section of theconnection cable).ᮣIs the power supply direct current? ➝Only operate sensor with direct current.4 .. 20 mA signal not presentᮣSensor correctly connected to a datalogger or peripheral device to 4 .. 20 mAinput (check polarity)? ➝Correct connection assignment.ᮣ4 .. 20 mA current loop correctly supplied through datalogger or OTT RLS(internal/external supply)? ➝Correct connection assignment.Measured value varies or is not presentᮣSensor (front plate) dirty? ➝Carefully clean the sensor.ᮣObstruction in the measurement beam? ➝Remove obstructions.ᮣSensor aligned at right angles to the water surface? ➝Correct sensor alignment.ᮣMounting location of the sensor steady (e.g. bridge movement)? ➝Optimize mounting location.ᮣLarge metal surfaces near the sensor beam (e.g. piling)? ➝Optimize mounting location.20
10 Note about the disposal of old unitsWithin the member countries of the European UnionIn accordance with the European Union guideline 2002/96/EC, OTT takes backold devices within the member countries of the European Union and disposes ofthem in an appropriate way. The devices concerned by this are marked with thesymbol shown aside.ⅥFor further information on the return procedure, please contact your ocal salescontact. You will find the addresses of all sales partners in the internet on"www.ott.com". Please take into consideration also the national implementationof the EU guideline 2002/96/EC of your country.For all other countriesⅥDispose of the OTT RLS properly after taking out of service.ⅥObserve the regulations valid in your country for the disposal of electronicdevices.ⅥNever put the OTT RLS into the normal household waste.21
11 Determining the maximum load resistance at the 4 … 20 mA interfaceThe load resistance (resistor) connected to the OTT RLS must not exceed a specificmaximum value. This value depends on the level of the supply voltage of the OTTRLS. If the load resistance is greater, the output current can no longer be evaluat-ed. Smaller load resistances are allowed.ⅥRead off the maximum load resistance for your power supply from the follow-ing diagram.Example: Power supply 18 volt ➝max. load resistance 450 ohm.The OTT RLS delivers an output current corresponding to the measured valuefor a load resistance of up to 450 ohm.ⅥDimension the connected electrical circuit accordingly. Check the input resis-tance of the connected peripheral device for this purpose.10 15 20 25 30 UV1000200300400500600700800RΩ9001000ExampleFigure 14. Diagram to determine themaximum load resistance as a functionof the power supply.Minimum power supply: 9.6 VMaximum power supply: 28 VResistor tolerance: 0.1 %/15 ppm.22
12 Technical DataMeasuring range 0.8 … 35 m 80 … 3500 cm 2.6 … 115 ftResolution SDI-12 interface 0.001 m 1 cm 0.01 ftMeasuring time 20 secondsPower supply 9.6 … 28 V DC, typ. 12/24 V DCPower consumptionMeasurement operation < 140 mWRest mode < 1 mWInterfaces 4 … 20 mA, SDI-12, RS-485, two-wire (SDI-12 protocol)Beam angle of antenna ±6 °MaterialsHousing ABA (UV-stabilized ABS) Radom (front plate) TFM PTFE Mounting 1.4301 (V2A)Weight (including mounting) approx. 2.1 kgCable gland sealing rangewith inlet (min. Ø … max. Ø) 4.0 … 7.0 mmwithout inlet (min. Ø … max. Ø) 7.0 … 11.0 mmConnection capacity of screw terminal stripSolid conductor 0.25 … 2.5 mm2(AWG 24 to 12)Wire with end cap and plastic collar 0.25 … 1.5 mm2Terminal assignment screw terminal stripTerminal 1 power supplyTerminal 2 RS-485 BTerminal 3 RS-485 ATerminal 4 4 … 20 mA –Terminal 5 4 … 20 mA +Terminal 6 SDI-12 DATATerminal 7 GNDRotation range of gimbal mountingLateral axis ±90 °Longitudinal axis ±15 °Type of protection at horizontal installation IP 67 (submersion depth max. 1 m;Submersion duration max. 48 h)Dimensions L x W x H 222 mm x 152 mm x 190 mmTemperature rangeOperation –40 … +60 °CStorage –40 … +85 °CRelative humidity 0 … 100 % non-condensingEMC limits and radio approvalsEMV for Short Range Device ETSI EN 301 489-3Safety of equipment of low voltage device EN 60950-1Approval for Short Range Device; Europe ETSI EN 300 440Approval for Short Range Device; USA FCC 47 CFR Part 15Approval for Short Range Device; Canada RSS 210 Issue 723
OTT MESSTECHNIK GmbH & Co. KGLudwigstrasse 1687437 Kempten · GermanyPhone +49 (0)8 31 5617- 0Fax +49 (0)8 31 56 17- 209info@ott.comwww.ott.comDocument number63.105.001.B.E ␤04-0807

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