Rohde & Schwarz RPG HATPRO Installation And Maintenance Manual
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Rohde & Schwarz RPG HATPRO Installation And Maintenance Manual

Rohde & Schwarz RPG HATPRO Installation And Maintenance Manual

Standard single-polarization radiometers
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RPG standard single-polarization radiometers
Applicable for
HATPRO, LHATPRO, TEMPRO, HUMPRO, LHUMPRO,
LWP, LWP-U90, LWP-U72-82, LWP-90-150,
Tau-225, Tau-225-350

Installation and Maintenance Guide

Setup, Operation, Maintenance of
Installation and Maintenance Guide ► 2.1 Choice of location
Code:
RPG-MWR-STD-INST
Date:
Installation & Maintenance
Issue:
23.03.2015
Pages:
(standard radiometers)
01/04
74
1

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Summary of Contents for Rohde & Schwarz RPG HATPRO

  • Page 1: Installation And Maintenance Guide

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Installation and Maintenance Guide Setup, Operation, Maintenance of RPG standard single-polarization radiometers Applicable for HATPRO, LHATPRO, TEMPRO, HUMPRO, LHUMPRO, LWP, LWP-U90, LWP-U72-82, LWP-90-150, Tau-225, Tau-225-350 Installation and Maintenance Guide ► 2.1 Choice of location...

  • Page 2: Document Change Log

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Document Change Log Date Issue/Rev Change 07.07.2011 00/01 Work 20.07.2011 01/00 Release 15.12.2011 01/01 description of weather station installation added (2.6.5) 20.12.2011 01/02 description of new 2 line fibre connector system added (2.7.4) 17.04.2014 01/03 changes in packing materials 23.03.2015 01/04...

  • Page 3: Table Of Contents

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Table of Contents Installation and Maintenance Guide ....................1  Document Change Log ........................2  Table of Contents ..........................3  1 Scope of this document ........................5  2 Setup and Installation ........................5  2.1 Choice of location ........................
  • Page 4 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 4 Maintenance ..........................56  4.1 Cleaning ..........................56  4.2 Software Upgrades ........................ 56  4.3 Absolute Calibration Procedure ..................... 57  4.3.1 External Liquid Nitrogen Cooled Calibration Target ............58  4.4 Exchange/Replacement of Parts ...................

  • Page 5: Scope Of This Document

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 1 Scope of this document This document describes all processes needed for installing and setting up the standard RPG radiometer models. The target audience is mainly the engineering and support personnel who are in charge of the initial installation, maintenance, station supervision, calibration, cleaning and repairs.

  • Page 6: Unpacking The Radiometer And Accessories

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2.2 Unpacking the radiometer and accessories The following standard components are delivered in addition to the radiometer: • Instrument stand with adjustable feet • External absolute calibration target (cold load) •...

  • Page 7: Accessories

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2.2.2 Accessories Fig.2.2.2: Accessory boxes with radiometer stand, calibration target, heater module, cables, IR Radiometer and azimuth drive. Fig.2.2.3: Folded stand and azimuth turn table both packed to their container. The radiometer stand and calibration target are both fastened to the box’...
  • Page 8 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) nut and washer Fig.2.3.1: One of the four stand’s feet. A nut and washer is screwed on the thread rod. Remove both from the thread bar as indicated in Fig.2.3.1b).
  • Page 9 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.3.3: The folded stand. Fig.2.3.4: Open clamps and turning legs into upright position. Fig.2.3.5: Stabilizer bars and mounting nuts. 2 Setup and Installation ► 2.3 Setup the Instrument Stand...
  • Page 10 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.3.6: Mounting the horizontal stabilizer bars. Fig.2.3.7: Completely mounted stand. Finally, the stand should be horizontally aligned. For this purpose, 4 spirit levels are located on the table plate’s edges (Fig.2.3.8a)). Adjust the feet as indicated in Fig.2.3.8b) for horizontal alignment. 2 Setup and Installation ►...

  • Page 11: Setup Of The Azimuth Positioner (Optional)

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) spirit levels Fig.2.3.8: Spirit levels on table base plate for horizontal adjustment of the stand. Without this adjustment, the reading of the elevation axis during measurements is not equivalent to the real observation elevation angle.
  • Page 12 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) After unpacking the azimuth drive and laying it on its table plate, the sub-unit looks like in Fig.2.4.1. Two cables are important for the later installation steps: The driver’s DC power cable (orange) and the controller’s RS-232 interface cable (black), labelled ‘DATA / AZ’.
  • Page 13 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.4.3: Fixing the azimuth drive with 6 M8x20 screws. Fig.2.4.4: 6 M6x20 screws for mounting the azimuth drive power supply (on the right). Fig.2.4.5: Mounting the azimuth drive power supply. 2 Setup and Installation ►...
  • Page 14 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) azimuth drive DC power cable 28 Volts DC output Fig.2.4.6: Plug in the azimuth drive DC power connector. Fig.2.4.7: Power splitter unit used instead of the power supply in Fig.2.4.4, if no azimuth positioner option is installed.
  • Page 15 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Unscrew the black plastic brackets (Fig.2.4.8) on the top of the azimuth table. The cable channels are labeled with the cable designations as shown in Fig.2.4.9a),b). Fig.2.4.8: Plastic brackets on cable channels. Fig.2.4.9: Labeled cable channels for a): AC1 cable (blue), DATA/AZ cable (black), fiber optics DATA cable (black) and b): AC2 cable (yellow).
  • Page 16 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.4.10: Feeding AC1, AC2, DATA/AZ and fibre optics data cable through centre hole. Thread the different cables into their associated channels and mount the black plastic brackets (Fig.2.4.11). Fig.2.4.11: Mounting the cables into the cable channels.

  • Page 17: Mounting Of Radiometer Box

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2.5 Mounting of Radiometer Box red arrows Fig.2.5.1: Radiometer box on azimuth turn table. table between these screws Fig.2.5.2: Four M8x20 screws for fixing the radiometer box on the azimuth driver table. After the installation and adjustment of the instrument stand and optional azimuth positioner, the radiometer box has to be lifted on the azimuth table (Fig.2.5.1) if the optional azimuth drive is installed, or directly on the stand’s top plate, if no azimuth positioner is used.
  • Page 18 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) For fixing the radiometer box on the azimuth table, four M8 screws (20 mm thread length) are used. If the radiometer box is directly mounted on top of the stand, eight M8 screws (30 mm thread length) are used.
  • Page 19 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) azimuth drive interface power Fig.2.5.5: Connector protection caps and ON / OFF switch. Before connecting the AC1, DATA/AZ and fiber optics cable, the connector socket protection caps must be removed. Keep these protection caps for future transportation use. If a socket is left unprotected during transportation, condensation water may accumulate inside the connector, which may lead to malfunctioning of the radiometer.
  • Page 20 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.5.7: Sequence for connecting the fibre optics data cable. After these connections have been performed (Fig.2.5.8), the cables should be pulled back to get the right length on the side wall (Fig.2.5.9). Finally they are fixed to the radiometer’s bottom plate by one or two cable ties (Fig.2.5.10).
  • Page 21 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.5.8: All cables connected to the radiometer. Fig.2.5.9: Pulling back the cables to adjust the cable lengths. Fig.2.5.10: Fastening cables on the radiometer’s bottom plate. 2 Setup and Installation ► 2.5 Mounting of Radiometer Box...

  • Page 22: Mounting Of Externals (Blower, Heater, Irr, Weather Station)

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2.6 Mounting of Externals (Blower, Heater, IRR, Weather Station) 2.6.1 Dew Blower mounting pockets mushroom pins Fig.2.6.1: Dew blower with mounting pockets. Fig.2.6.1 shows the dew blower with its mounting pockets. When attaching the blower to the radiometer, the mushroom pins have to slide into these pockets.

  • Page 23: Heater Module

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) The first step is to push the blower against the radiometer housing so that the mushroom pins slide into the blower’s mounting pockets (1. in Fig.2.6.2). In the second step, the blower is released to slide downwards (2.
  • Page 24 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.6.5: Shift the heater module underneath the blower’s air inlet and fasten the mounting screws as indicated. Fig.2.6.6: Connect blower supply to heater module (a)) and then connect heater module to radiometer ( b), ‘DB’...

  • Page 25: Mounting Of Ir Radiometer (Optional)

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.6.8: Fixing AC2 cable on radiometer bottom plate. 2.6.3 Mounting of IR Radiometer (Optional) The infrared radiometer data is used as an additional information for retrievals dealing with cloud base height, humidity profiling, LWC profiling, etc.
  • Page 26 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Rotatable IR mount (Option IRR-A) gold plated mirror Fig.2.6.9: Infrared radiometer mounted to the radiometer side wall on manually adjustable elevation axis. Because of an axial mount the IR radiometer viewing angle can be changed between 0° and 90° and fixed at an arbitrary angle in this range.
  • Page 27 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) elevation scale Fig.2.6.11: The manual adjustment is performed by loosening the clamp (C), rotating the IRRs to the desired elevation position (use the elevation scale) and fastening the clamp again. 2.6.3.2 Motorized IRR Elevation Axis (Optional) If arbitrary scan patterns (e.g.
  • Page 28 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.6.12 For the motorized IR-Option (Option IRR-B), the IR radiometers are mounted with three M4 screws (A). NEVER touch the screw in (B). It has been adjusted to an elevation axis tilt accuracy of 0.3°.
  • Page 29 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.6.13: Also fasten the IR-interface cables with a cable tie. 2.6.3.3 Mounting of Improved IR Protection Housing (Optional) Since March 2015, an improved protection housing for the IR radiometer is available (please contact RPG for ordering code).
  • Page 30 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) The upgrade kit consists of two separate sheet parts (A) and (B) and four screws (C). 1. First of all, remove the reflecting mirror and put the sheet (A) over the reflector carrier as indicated in (D).
  • Page 31 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Replace the two screws holding the reflecting mirror, by the extension screws in (C). Use a metric 8 mm wrench to fasten the extension screws. Mount part (A) with to screws to the extension screws. Remove the old housing.

  • Page 32: External Rain Sensor And Gps Clock

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Slide the new housing (B) over the IR radiometer and fasten it as indicated. 2.6.4 External Rain Sensor and GPS Clock The rain sensor and GPS clock are not dismounted for transportation. 2 Setup and Installation ►...

  • Page 33: External Weather Station

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2.6.5 External Weather Station MWS-3 pole ends here The external weather station MWS-3 is mounted to a 1.2 m long pole which is clamped to the radiometer housing by three black clamp blocks. The electrical MWS-3 connector socket is left to the fibre data connector (MWS).
  • Page 34 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) ‚N’ mark ‚N’ mark Fig.2.6.14: Orientation of north mark “N” relative to the radiometer observation side, marked by the red arrow. 2 Setup and Installation ► 2.6 Mounting of Externals (Blower, Heater, IRR, Weather Station)

  • Page 35: Fibre Optics Converter

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2.7 Fibre Optics Converter 2.7.3 Old Version (6 Lines) The fibre optics data cable has a 6 way Harting connector on the radiometer end (see Fig.2.5.7) and 6 single ended fibre lines on the Host PC end (Fig.2.7.1) Fig.2.7.1: 6 line fibre optics cable on the host PC end.
  • Page 36 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) input fiber 6 input fiber 5 input fiber 4 input fiber 3 input fiber 2 input fiber 1 Fig.2.7.3: Fibre to RS-232 converter module from inside. The active fibre optics line is only 50 µm in diameter, embedded into a glass matrix (white, see Fig.2.7.5).
  • Page 37 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) bayonet coupling nose active central zone glass matrix Fig.2.7.5: Details of the glass fibre connector. slit Fig.2.7.6: Socket slit and connector pushed into the socket. 2 Setup and Installation ► 2.7 Fibre Optics Converter...

  • Page 38: New Version (2 Lines)

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.7.7: All 6 glass fibre lines connected with the converters sockets. Notice the numbering on each of the lines. 2.7.4 New Version (2 Lines) All radiometers shipped in 2011 or later are equipped with 2 line fibre optics data cables. These cables also differ in the type of connector and converter.
  • Page 39 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) collimation lenses Fig.2.7.8b: New 2 line fibre optics connector plug. Fig.2.7.8c: Plug in new 2 line fibre optics connector. The new system comprises collimation lenses on both fibre ends which prevent de-focussing and connection loss under cold environmental conditions.

  • Page 40: Electrical Connections

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.7.8d: 2 line fibre optics to RS-232 converter. The other end of the 2 line fibre cable is connected to a MOXA Fibre-to-RS-232 converter as indicated in Fig.2.7.8d. The converter’s power cable has a USB plug. Please plug this into one of the 4 USB sockets on the rear side of the industrial PC.
  • Page 41 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 2 Setup and Installation ► 2.8. Electrical Connections...

  • Page 42: Recommendations For Viewing Directions And Angles

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.8.2: Avoid loops in the fibre optics cable. The curvature radius should not be less than 5 cm. Crossings of cables can lead to cable damage when stepping on it. 2.9 Recommendations for Viewing Directions and Angles Fig.2.8.1 and 2.8.2 show the requirements for the free viewing ranges.
  • Page 43 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.2.8.2: Boundary layer scan viewing range. 2 Setup and Installation ► 2.9 Recommendations for Viewing Directions and Angles...

  • Page 44: Quick Start Guide

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 3 Quick Start Guide This guide is meant to explain how to switch on the instrument and execute pre-defined measurements, and reversely terminate measurements and switch off the radiometer. All details about how to define measurement modes, using the operating software, handling the data etc.

  • Page 45: Safety During Liquid Nitrogen Calibrations

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) instrument warranty. Damages (and consequential damages) from either violating the radiometers physical and electrical integrity, or arising from third parties (including animals, e.g. bird attack to the microwave window) are not covered by the radiometer warranty. 3.1.2 Safety during liquid nitrogen calibrations During liquid nitrogen (LN2) calibrations, all persons handling the LN2 •...

  • Page 46: Connect Host To Radiometer

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) After turning the switch to the ON-position, the radiometer initializes all interfaces. If an azimuth positioner is installed, the table will turn to its zero index position. Also the microwave mirror inside the radiometer box is adjusted.
  • Page 47 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) starting configuration settings (black arrow). By pressing <ESC> during software start, the user enters a menu where he can overwrite some settings of the automatically loaded configuration file R2CH.CFG.
  • Page 48 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.3.3.2: Serial interface menu. is checked, the host software automatically attempts to connect to the radiometer Auto Connect during the starting phase (if a data cable is detected). This feature enables an auto-start up function after a power failure of the host PC.

  • Page 49: Sending A Measurement Definition File

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers)   • The next step is to initiate the communication between the host and radiometer PC by pressing (Connect to Radiometer). If successful, the message Connection to radiometer is displayed.

  • Page 50: Browsing Through The Measurement Displays

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) In order to send a MDF to the radiometer, click the button (Send Measurement Configuration). The menu in Fig.3.4.1 is shown. Check the two checkboxes Auto Go and Auto Send and mark one of the MDF files listed in the MDF list.
  • Page 51 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) The monitoring of the products that were selected in the MDF is automatically activated and the measured data is displayed. Since the data is transmitted online from the radiometer to the host, no additional file transfer is required afterwards.
  • Page 52 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Time series graphs can be changed by selecting a different time axis period from the time axis selection box. A 24 hour history of IWV, LWP, meteorological sensors and profiles Atmospheric Data (24 hours): is continuously updated in this group.
  • Page 53 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) boundary layer) and one for the composite profile (CMP.TPC). The composite temperature profile is a combination of the high vertical resolution boundary profile and the full troposphere profiles. Both profiles are linked together at the 1200 m altitude level by applying a cubic spline fit.
  • Page 54 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) dew point Fig.3.5.5: Atmospheric profiles display. This display is similar to the brightness temperature diagram and monitors the time Attenuation: series of atmospheric attenuation. The vertical axis unit is dB as the standard unit for damping parameters.

  • Page 55: Starting/Stopping Measurements

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.3.5.6: Skew-T diagram and Stability Indices display. 3.6 Starting/Stopping Measurements (Halt Running Batch) A running measurement can be halted any time. This might be useful when e.g. the user wants to change the elevation angle manually.

  • Page 56: Maintenance

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 4 Maintenance 4.1 Cleaning RPG radiometers are designed to withstand all kind of weather and climate conditions. However, it is a good practice to prevent accumulations of dust, dirt, debris, salt (if located close to the sea), and other pollutants.

  • Page 57: Absolute Calibration Procedure

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Press OK and the 2CH.EXE on the radiometer PC will be overwritten by the new 2CH.EXE version. Exit the File Transfer Menu after that. Fig.4.2.1: File Transfer Menu b) Boot the radiometer PC to make the new 2CH.EXE the running version.

  • Page 58: External Liquid Nitrogen Cooled Calibration Target

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.4.3.1: External ambient temperature target for models RPG-15-90, RPG-HALO-KV, RPG- HALO-119-90 and RPG-HALO-183. 4.3.1 External Liquid Nitrogen Cooled Calibration Target An absolute calibration standard is the liquid nitrogen cooled target that is attached externally to the radiometer box (see Fig.4.3.2).
  • Page 59 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.4.3.2: External cold load attached to the radiometer box. Support Fig.4.3.3: External absolute calibration target (cold load). 4 Maintenance ► 4.3 Absolute Calibration Procedure...
  • Page 60 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.4.3.4: a) mounting the support posts to the target frame. b) Screws for mounting target to radiometer housing. Fig.4.3.5: location of mounting screws for the target frame. Fig.4.3.6: Pushing the target into the frame. Once the target frame is set up it can be fastened to the radiometer housing.
  • Page 61 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) The styro-foam container is then pushed into the frame. Do not push the target completely into the frame to allow for filling the LN2 into it (Fig. 4.5.b). For filling the target with liquid nitrogen the following procedure is recommended: Start with pouring the liquid nitrogen into the small Styrodur container included in the accessories.
  • Page 62 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) After setting up the external cold target, an absolute calibration is initiated by clicking (Perform Calibration) on the host PC. The menu in Fig.4.3.8 is shown, if the connected instrument Absolute is a profiling, LWP or tipping radiometer.
  • Page 63 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.4.3.9: Absolute calibration menu (RPG-15-90, RPG-HALO-KV, RPG-HALO-119-90 and RPG-HALO-183 models). It contains the additional box as indicated in Fig.4.3.9. As discussed in section 4.3, Ambient Target an external calibration target is used for models RPG-15-90, RPG-HALO-KV, RPG-HALO-119-90 and RPG-HALO-183, shown in Fig.4.3.1.

  • Page 64: Exchange/Replacement Of Parts

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.4.3.10: After the target frame has been unscrewed the open threads should be protected by plastic caps. Except for the automatic calibrations performed by the instrument (following the settings of the measurement definition file (MDF)) a manual absolute calibration (using LN2) is required when the system is transported or turned off for a longer period (>...

  • Page 65: Changing The Gps Receiver

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) The replacement part is mounted by reversing the sequence of steps. In order to prevent damage to the cable connector, please comply with these rules: • The pins usually fit easily into the socket of inside the radiometer wall. Do not apply force! If it does not go in easily, then there is some misalignment, canting, etc.

  • Page 66: Changing The Microwave Window Sheets

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Fig.4.4.1: Dismounting the external surface sensors: A) Sensor cage below the dew blower. B) Unscrewing the T-sensor fan. C) Unscrewing the sensor cage housing. D) The humidity sensor (with gold plated cap) and the temp.
  • Page 67 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) In a first step, the old window has to be removed. Therefore, all M4 Torxs screws at the inside rows of screws (closer to the blue window, not the line of screws closer to the metal housing) have to be removed (Fig.
  • Page 68 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) housing, some force needs to be applied to pull the metal bands tight and apply enough pressure to squeeze the window material into position (Fig. 4.4.2 m, and o). Figure 4.4.2 k, l, m This pulling of the metal bands is best done with a small Allen wrench, putting the head into the holes of the mounting threads as a counter bearing (as a toe hold).

  • Page 69: Preventive Maintenance

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) Figure 4.3.2 q, r, s After cutting the excess material, the window sheet is finally fixed with the short metal bands at the lower sides. Figure 4.4.2 t, u, v In the end, the window material should be firmly pressed to the metal housing frame, without leaving any gaps (Fig.

  • Page 70: Trouble Shooting

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 5 Trouble Shooting problem possible cause what to do host connection to A) bad cable inter- check all connectors for cleanliness and radiometer cannot be connection correct fitting, data cable(s) damaged? established Fibre optics cable connected correctly? B) radiometer...
  • Page 71 Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) problem possible cause what to do surface temperature sensor malfunction Replace temperature sensor (field replaceable) sensor shows unrealistic temperature surface humidity sensor sensor calibration contact RPG for sending new SENSOR.SCL file for installation on shows unrealistic parameters not correct...

  • Page 72: Spare Part List

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 6 Spare part list – To be edited – Spare part Interval (if preventive) Reason for change 6 Spare part list ► 4.5 Preventive maintenance...

  • Page 73: Radiometer Dimensions

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 7 Radiometer dimensions 7 Radiometer dimensions ► 4.5 Preventive maintenance...

  • Page 74: Safety Instructions

    Code: RPG-MWR-STD-INST Issue: 01/04 Date: 23.03.2015 Pages: Installation & Maintenance (standard radiometers) 8 Safety Instructions 8.1 Operation Safety Issues The RPG dual polarization radiometers are huge and heavy instruments. The installation and operation of these systems requires the application of a few safety rules which are listed below together with their international signs.

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