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OTT Kipp & Zonen LAS MkII Operation Manual

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LAS MkII Scintillometer
Operational Manual

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Summary of Contents for OTT Kipp & Zonen LAS MkII

  • Page 1 OTT HydroMet brand LAS MkII Scintillometer Operational Manual...
  • Page 2 2628 XH Delft The Netherlands +31 15 2755 210 solar-info@otthydromet.com www.otthydromet.com All rights reserved. All content is the intellectual property of OTT HydroMet. Reprinting, duplication and translation (even as excerpts) are only permitted with the prior written consent of OTT HydroMet. Subject to technical change.

  • Page 3: Table Of Contents

    Table of contents Scope of supply Order numbers and variant code Product variants Accessories and spare parts About this manual Other applicable documents and software General signs and symbols Explanation of warnings General safety instructions Intended use Potential misuse Personnel qualification Operator obligations Personnel obligations Correct handling...
  • Page 4 7.2.2 Connecting the transmitter 7.2.3 Connecting the receiver Commissioning Configuration using display and navigation keys 8.1.1 Receiver display and menu navigation keys 8.1.2 Configuration for measurement Transmitter optical alignment Receiver optical alignment Finalizing optical alignment Configuration using EVATION 8.5.1 Starting the software 8.5.2 Establishing connections 8.5.3...

  • Page 5: Scope Of Supply

    1 Scope of supply The following items are included with delivery: – LAS MkII transmitter with pan and tilt adjuster and baseplate – LAS MkII receiver with pan and tilt adjuster and baseplate – 2 alignment telescopes with detachable mounting, adjusted for each transmitter and receiver –...

  • Page 6: Order Numbers And Variant Code

    2 Order numbers and variant code 2.1 Product variants Variant Order number LAS MkII large aperture scintillometer with transit case 0371900 2.2 Accessories and spare parts Item Order number Height Adjustable Tripod (set of 2) 0357703 Heavy Duty Tripod Floor Stand 0353710 Height Extension Tube 0353750...

  • Page 7: About This Manual

    3 About this manual 3.1 Other applicable documents and software The following documents contain further information on installation, maintenance and calibration: – Instruction Manual LAS MkII - Scintillometer The documents above and the following software can be downloaded at www.kippzonen.com: –...

  • Page 8: Explanation Of Warnings

    3.3 Explanation of warnings To avoid personal injury and material damage, you must observe the safety information and warnings in the operating manual. The warnings use the following danger levels: WARNING WARNING This indicates a potentially hazardous situation. If the hazardous situation is not avoided, it may result in death or serious injuries.

  • Page 9: General Safety Instructions

    4 Do not change or convert the product in any way. 4 Do not perform any repairs yourself. 4 Get OTT HydroMet to examine and repair any defects. 4 Ensure that the product is correctly disposed of. Do not dispose of it in household waste.

  • Page 10: Working Outdoor

    4.7 Working outdoor 4.7.1 Installation and maintenance at great heights It is advised to mount the product in a certain height. Therefore, there is a risk of falling down. 4 Observe and follow the local safety regulations. 4 Use suitable safety equipment. 4 Inspect the safety equipment before use.

  • Page 11: Product Description

    5 Product description 5.1 Design and function The LAS MkII scintillometer measures the path-averaged structure parameter of the refractive index of air (C ) over horizontal path lengths. The instrument is self-contained and can be configured at the receiver with display and menu keys. Additionally, the software EVATION is included.
  • Page 12 Transmitter rear panel Power indicator (red) Power input socket (12 V DC) Transmitter power adjustment knob (remove Diagnostic signal output socket (4-pin) screw-on cover) Receiver rear panel Power and status indicator (green) Analogue signal socket (4-pin) Display Power input socket (12 V DC) Menu navigation keys Digital interface socket (8-pin) GPS antenna socket (8-pin) <12>...

  • Page 13: Transport, Storage, And Unpacking

    6 Transport, storage, and unpacking 6.1 Transport 4 Transport the product always in its original packaging. 4 Ensure that the product is not mechanically stressed during transport. 6.2 Storage 4 Store within specified temperature ranges. 4 Store in dry area. 4 Store in original box where possible.

  • Page 14: Installation

    7 Installation 7.1 Mechanical installation 7.1.1 Required tools and aids The following tools and aids are required: – Stable mounting bases for the transmitter and receiver or tripods – Tape measure for determining the installation height – 2 radios or mobile phones for communication between transmitter and receiver operators –...
  • Page 15 H = 50 W/m2 H = 100 W/m2 H = 150 W/m2 H = 250 W/m2 H = 300 W/m2 H = 400 W/m2 no saturation saturation 1000 1500 2000 2500 3000 3500 4000 4500 Path length LAS [m] Minimum installation height with full 150 mm aperture H = 50 W/m2 H = 100 W/m2 H = 150 W/m2...

  • Page 16: Installing Aperture Restrictors

    When the area is not flat, it is advised to measure the height of the beam at several points along the path. Based on the surface and the instrument's path-weighting function, the precise beam height can be estimated. The effective height can be calculated with the calculator in the EVATION software, refer to Appendix F in the instruction manual.

  • Page 17: Mounting Instrument

    Cap screw M4 x 25 Aperture restrictor Nylon washer Nylon spacer The 100 mm diameter aperture restrictors are fitted to the transmitter and receiver windows as follows: 4 Remove 3 of the 6 retaining screws of the respective window. 4 Replace the screws with the nylon spacers. 4 Place the restrictor on the window.

  • Page 18: Installation And Initial Alignment Of Instrument

    4 Ensure there are at least two people at the installation site to install the device. 4 Mount the transmitter and receiver to a support (such as the optional height extension tube) with the baseplate. 4 Fasten the transmitter and receiver to the baseplate by hand using the 4 mounting slots for 10 mm bolts. 4 Ensure that the transmitter and receiver can still be turned around their vertical axes.

  • Page 19: Electrical Installation

    7.2 Electrical installation 7.2.1 Electrical connections The instrument has 2 waterproof plugs on the rear panel of the transmitter and 4 on the rear panel of the receiver, as described in the following chapters. 7.2.1.1 Power connection The transmitter and receiver are each provided with a 4-pin waterproof plug fitted to a 10 m long cable that is terminated in tinned wires, for 12 V DC (nominal) power to the instrument and heater.
  • Page 20 Pin assignment Wire Number Color Function Value Impedance -2/3 Log UC signal + 0 to 2.4 V, 10 to 10  m 680 Ω, 4700 pF Blue 8 kHz AC carrier signal + 0 to 1 V RMS, 100 % = 120 Ω, 4700 pF 152 mV RMS Green demodulated carrier signal 0 to 2 V, 100 % = 606 mV 680 Ω, 4700 pF demod Yellow...
  • Page 21 Wire Number Color Function RS-232 function Green DSR (Data Set Ready) Yellow RTS (Request to Send) Blue CTS (Clear to Send) RI (Ring Indicator) shield Thick black cable screen Only pin 2, 3 and 5 of the 9-pin D plug are connected. 7.2.1.5 Receiver digital interface plug with GPS Pin assignment Wire...

  • Page 22: Connecting The Transmitter

    4 If a hardware error message occurs, turn off the power and restart the receiver. 4 If the error persists, contact the technical support department of OTT HydroMet. A configuration error message is displayed, if one or more of the configuration parameters stored in the memory are not correct, refer to Appendix D in the instruction manual.
  • Page 23 4 At the receiver set the signal gain using the navigation keys as follows: Main Menu - 2. Configuration - 1. Installation - 6. Signal Gain - 1 4 Return to the main menu and select: Main Menu - 1. View RealTime - 1. Signal Level <23>...

  • Page 24: Commissioning

    8 Commissioning 8.1 Configuration using display and navigation keys The waterproof display and menu navigation keys on the rear panel of the instrument receiver enable configuration and control of the instrument. 8.1.1 Receiver display and menu navigation keys The following keys are used to navigate through the (sub-)menus or to select or enter a value: Scroll mode Up key Select next menu item...

  • Page 25: Configuration For Measurement

    2. path length 2. path length 0110.0 m 0110.0 m 2. path length 2. path length 1110.0 m 1110.0 m 2. path length 2. path length 1110.0 m 1110.0 m 1110.0 m 2. path length 2. path length 1210.0 m 1210.0 m 1210.0 m 2.
  • Page 26 Sub-menu Sub-menu item Function Range Default* 2. Advanced 1. Rel. humidity Set or show relative humidity 0 to 99.9 % 50 % 2. Heat capacity Set or show heat capacity of air 500.0 to 1999.9 1000 3. Bowen ration Set or show Bowen Ratio 0.01 to 9.999 4.
  • Page 27 The aperture maximum value depends on the effective diameter (see menu Device). The signal gain can also be set in menu 1: 4 Select Realtime data - 1. Signal level. 8.1.2.1 Parameters to measure Cn2 is measured with the aperture diameter (D), the path length (L) and the measured variance of the natural logarithm of intensity fluctuations (σ...

  • Page 28: Transmitter Optical Alignment

    Setting Function wakeup time The wakeup time defines the start of the operational mode. When the operational mode is active the instrument is measuring and logging data. The receiver heater is turned on when the temperature of the receiver is below the operating temperature in the heater menu. sleep time The sleep time defines the start of the low power sleep mode, during which there is no measurement and the receiver heater is turned on only when the temperature of the...

  • Page 29: Receiver Optical Alignment

    4 Adjust the transmitter slowly vertically up and down using the adjustment screws to find the mid-point max. signal strength. 4 If the receiver signal strength is more than 200 %, reduce the transmitter power for a reading of about 100 %. 4 Optimize the horizontal and vertical alignment for the max.

  • Page 30: Configuration Using Evation

    4 For the receiver only, place the GPS mounting bracket with GPS antenna on top of the instrument and place the sun shield on top of the mounting bracket. 4 Fasten the sun shield and mounting bracket with two M4 x 16 hexagonal head screws and washers. 4 Store the telescopes carefully for future use.

  • Page 31: Adjusting The Communication Parameters

    4 In the drop-down list under LAS System select Direct Connection. 4 In the drop-down list under LAS type select the appropriate instrument. 4 Adjust the Aperture Diameter to 100 mm, if aperture restrictors are installed. ð For the LAS types LAS Mk II, XLAS Mk II or User Defined in combination with Direct Connection, the tabs Communication, Installation and House Keeping are available.

  • Page 32: Installation Parameters

    8.5.4 Installation parameters 4 Open the Configuration menu and click on System Setup. 4 Open the Installation tab. 4 The following parameters regarding the installation can be adapted: Parameter Description Effective height LAS For an even terrain with minimal changes in elevation along the path, the effective height of the beam is relative to the ground.

  • Page 33: Operation

    9 Operation 9.1 Collecting data The software EVATION collects data from the receiver's internal data logger and has a real-time display function. This real-time or downloaded data can be processed into heat flux data. 4 Connect the instrument receiver to a computer running EVATION. 4 Select the Real-time Data tab from the main screen.

  • Page 34: Calibrating The Instrument

    Parameter Description Read new Only new data is downloaded Read all All data in the memory is downloaded Download: Manual Download data at the user's request at slow speed, while continuing logging / LAS operation Download: Automatic Download new data records as soon as they are available in the receiver Download: Fast Stops logging and downloads data at the user's request at high speed Start download...
  • Page 35 4 Enter 2. Configuration - 1. Installation - 2. Path length - 1184 m - Confirm 4 For Firmware 3.00 and higher: No need to alter the aperture and path length settings. 4 Enter Main Menu - 4. Diagnostics - 2. Offset ð...

  • Page 36: Maintenance

    4 Check the data logger memory capacity Operator Quarterly 4 Check all cables and connectors Operator Quarterly 4 Check the mountings are secure Operator 10 years or during 4 Replace the internal desiccant in the transmitter and OTT HydroMet recalibration receiver. <36>...

  • Page 37: Troubleshooting

    4 Check the performance of the real-time C calculations of the receiver 4 Report any malfunctions or damage to the representative of OTT HydroMet. 11.2 Testing the GPS The LAS should display Firmware 3.00, when the power supply is switched on.
  • Page 38 GPS status message Description GPS timed out No data received from the GPS (GPS cable not connected, no communication, GPS hardware problems, cable problems or wrong baud rate / parity etc.); the GPS times out after 30 sec of no communication. GPS not enabled The communication port COM2 is not enabled or the baud rate of the GPS is not set (baut rate = 0), see configuration menu Interface COM2...

  • Page 39: Repair

    12 Repair 12.1 Customer support 4 Have repairs carried out by OTT HydroMet service personnel. 4 Only carry out repairs yourself, if you have first consulted OTT HydroMet. 4 Contact your local representative: www.otthydromet.com/en/contact-us 4 Include the following information: – instrument model –...

  • Page 40: Notes On Disposing Of Old Devices

    In accordance with the German Electrical and Electronic Equipment Act (ElektroG; national implementation of EU Directive 2012/19/EU), OTT HydroMet takes back old devices in the Member States of the European Union and disposes of them in the proper manner. The devices that this concerns are labeled with the following symbol: 4 For further information on the take-back procedure contact OTT HydroMet: OTT HydroMet B.V.

  • Page 41: Technical Data

    14 Technical data 14.1 Optical and electrical data Specifications of the LAS MkII transmitter and receiver Specification Value Supply voltage nominal 12 V DC (9.6 to 18 V DC Window heater Self-regulating (heater off at approx. +55 °C) Surge protection For transmitter power, but not for heater Operating temperature -20 °C to +50 °C Humidity range (non-condensing)

  • Page 42: Dimensions And Weight

    Specification Value for LAS MkII Value with restrictors Maximum path length 4.5 km* 1 km Minimum height 1.5 m 1.5 m Maximum height for C no operational restriction no operational restriction turbulence) measurements Maximum height for H Approx. 100 m Approx. 100 m measurements Constant Flux Layer *The transmitter has sufficient power to reach 6 km with clear atmospheric conditions, but the user must be careful to check that the LAS is at a sufficiently high height (on a high tower) to avoid saturation, but not outside the Constant Flux layer.
  • Page 43 <43>...
  • Page 44 Contact Information...

This manual is also suitable for:

0371900

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