Operating Instructions METRISO PRIME+ 3-349-822-03 2/3.
5 4 3 2 1 6 7 8 9 10 14 13 12 12 11 11 15 2 16 17 18 19 GMC-I Messtechnik GmbH
1 Function selector switch Switch positions: SETUP: General device settings Print out measured values and reports Select data memory function OFF: TEST: 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Switches the test instrument off * Select measuring and test parameters, and execute measurements and tests : Select main menus and submenus, and adjust values : Select main menus and submenus, and adjust values Socket connector for RS 232 interface LCD panel Signal lamp for test passed (green) / test failed (red) MENU:
8 7 4 5 High-Voltage Switching Pistol 1 6 I 2 0 ! 3 PROFITEST 204 HP/HV High-Voltage Module, Connection Panel 4 Retrofitting with a high-voltage module (feature B1 or B2) can only be performed by GMC-I Service GmbH. The high-voltage module is then controlled by MERISO PRIME+. 1 Inlet plug for high-voltage module supply power with fuse insert 2 Key switch for prevention of unauthorized start-up 3 Connection for external signal lamps (see chapter 3.2.
PC Program WinProfi for communication with MERISO PRIME+ The free PC starter software WinProfi is used for communication with your MERISO PRIME+ test instrument.
Contents Page 1 1.1 Applications ..................................................................................8 List of Available Features ...............................................................9 2 2.1 2.2 2.2.1 2.2.2 2.2.3 2.2.4 2.3 Safety Features and Precautions ................................................10 Checklist for High-Voltage Tests ....................................................11 Significance of Symbols .................................................................
Contents Page 5 5.1 5.1.1 5.1.2 5.1.3 5.2 5.3 5.3.1 5.3.2 5.4 Processing, Reorganizing and Deleting Data ............................. 48 Select Device under Test (DUT) .................................................... 48 Entering Descriptions ............................................................... 49 Copying Descriptions ............................................................... 50 Deleting Descriptions ...............................................................
1 Applications The MERISO PRIME+ insulation measuring instrument is in compliance with the following standards and regulations: Standard DIN EN 61557-1:2007 DIN EN 61557-2:2008 VDE regulation VDE 0413 Part 1:2007 VDE 0413 Part 2:2008 “Equipment for testing, measuring or monitoring protective measures in systems with line voltages of up to 1000 V AC and 1500 V DC, part 2, insulation resistance measuring instruments”.
1.1 List of Available Features Features Country version (user interface language, mains plug type) 0 01 D A PROFITEST204HP/2.5kV 1) B none (not with C1) 05 07 10 15 43 NLD NL ESP E ITA I CHE CH USA USA with2) Set of batteries (not with B1, B2) C none with DAkkS calibration certificate 3) E none with “Guard 5000A” measurement cable G none with “LEADEX 5000” extension cable H none with SECUTEST PSI printer module I none with 2) 3) 02 with PROFITEST204HV/5.
2 Safety Features and Precautions The MERISO PRIME+ test instrument, and the PROFITEST204HP/2.5kV and PROFITEST204HV/5.4kV high voltage modules have been manufactured and tested in accordance with the following safety regulations: Standard DIN EN 61557-1:2007 DIN EN 61557-2:1998-05 IEC 61010-1:2004 EN 61010-1:2002 VDE regulation VDE 0413 Part 1:2007 VDE 0413 Part 2:1998-05 VDE 0411 Part 1:2002 If used for its intended purpose, safety of the user, the instrument and the device under test is assured.
Opening of Equipment / Repair The equipment may be opened only by authorized service personnel to ensure the safe and correct operation of the equipment and to keep the warranty valid. Even original spare parts may be installed only by authorized service personnel. In case the equipment was opened by unauthorized personnel, no warranty regarding personal safety, measurement accuracy, conformity with applicable safety measures or any consequential damage is granted by the manufacturer. 2.
2.2 Significance of Symbols 2.2.3 Symbols in the User Interface 2.2.1 Symbols on the Device The symbols on the device have the following meanings: High-voltage warning, Voltage at the test probe between 1000 and 5000 V Indicates EC conformity ! Life endangering for the operator if the wiring diagram and the operating instructions are not observed! Warning concerning a source of danger (attention: observe documentation!) This device may not be disposed of with the trash.
2.2.4 Symbols in the User Interface with Feature B1/B2 or or High-voltage module ready to be switched on Life endangering high voltage of up to 5.35 kV is present at the test probes of the highvoltage module. Test completed successfully, residual voltage less than 25 V Display of phase angle The specified limit value IMAX has been exceeded. Current limiting has switched the device to the “standby” mode.
! ! ! Attention! The vent slots in the bottom of the high-voltage module may not be covered! Attention! Observe the Rules for Electrical Testing Equipment issued by the GERMAN TRADE ASSOCIATION FOR PRECISION ENGINEERING AND ELECTRICAL ENGINEERING (see enclosed brochure).
3 Initial Start-Up The MERISO PRIME+ test instrument is supplied with a base which serves as a compartment for storing test cables, the guard cable (feature G1), the test probes and the battery pack (feature C1). ! 3.1 Attention! The test instrument may only be operated if the base is properly attached and secured. Battery Operation, Feature C1 (not with B1/B2) The battery pack is required for operation of the MERISO PRIME+ without mains power. The battery back includes 8 NiMH batteries.
Ð Connect the two cables to each other and secure the connection with the snap hooks. Ð Position the cable such that is cannot be pinched during subsequent assembly. Ð Carefully set the device onto the base as shown in the photo by grasping the handle with one hand, and guiding the bottom of the device into position with the other hand. Ð Grasp the base and the device, and turn the entire unit upside down. Ð Secure the base with the included screws and washers.
! Attention! Use only the screws furnished with the device together with washers. Longer screws may reduce creepage distances or damage the device. Possible Danger of Pinching! If a battery pack (feature C1) has been installed and the device is not connected to the mains, the battery symbol appears at the display when the device is switched on, and the number of dark bars displayed in the symbol indicates the battery charge level.
3.2.3 Indication of Operating States Signal Lamps at the High-Voltage Module The signal lamps integrated into the high-voltage module indicate two different operating states: Green: Test instrument ready for use • Key switch is in the “I” position (ON). • Power supplies for signal and control circuits at the high-voltage module are switched on. • Test voltage supply circuits are still switched off, and are still secured against inadvertent activation.
3.3 Mounting the MERISO PRIME+ with Feature B1/B2 to the Trolley (feature D1). Ð Set the complete unit consisting of test instrument and high-voltage module onto the trolley’s platform (1) such that the cover of the test instrument can still be opened. 11 Ð Secure the test instrument’s handle to the vertical supports with the handle clamps (3). Loosen the screws in the handle clamps (9) to this end with a 4 mm hollow hex wrench.
3.4 Mains Connection ! U L – N = 230 V L1 N green-yellow PE L1 L2 L3 N green-yellow Attention! If a connection via earthing contact outlet is not possible, disconnect the mains from all sources of voltage before connecting the cables of the coupling socket via pick-up clips with the mains connections, as shown in the drawing. PE L1 L2 L3 If a battery pack has not been installed, the mains connection symbol appears after the test instrument has been switched on.
3.5 User Interface Measuring and testing with the MERISO PRIME+ is quick and easy. The integrated user interface provides the operator with information regarding required operating steps, operator errors, measurement results and more for all measuring functions. All information and measurement results appear at a dot matrix LCD panel in plain text. The integrated user interface is entirely adequate for the great majority of all tests and measurements.
3.7 Setup Various basic settings can be selected for the test instrument with the selector switch in the SETUP position. 3.7.1 Adjusting Contrast and LCD Illumination Contrast can be increased or decreased with this function. LCD illumination can be switched on or off as well.
3.7.2 Setting Date and Time The test instrument’s internal clock can be set with this function. The clock continues to run after supply power has been disconnected. Date and time are included in the test reports. Entries are made using the following formats: Date: DD.MM.YYYY (Day.Month.
3.7.3 Beeper Settings The beeper can be completely deactivated or activated as indicated in the table below.
3.7.4 Executing the Self-Test This function displays important device data first. If required, display lamp and relay functions, as well as other options, can be tested automatically and results appear at the display. START SETUP Battery Voltage and LED Test START Select Self-Test Continue Test MENU Open Entry Menu 3 Results: OK Error message: – Test failed – component defective – component not available (e.g.
3.7.5 Downloading a Language or a Software Update A Installing WinProfi to the PC and Starting the Program If you require a language other than one of those included with the instrument, it can be downloaded with the help of WinProfi* PC software. The data file with the desired language is transmitted to the test instrument via the serial interface. The previously installed language is overwritten.
B Prerequisites for Software Update or Exchange of Data C Transmitting a Software Update to the Test Instrument Ð Find the interface to which the MERISO PRIME+ is connected. Ð PC: Select Update all from the update menu. Follow the instructions which appear at the monitor. Note Always start this function first, before performing an update or changing report templates. After starting this function, WinProfi loads the report files required specifically for the connected instrument.
D Organizing Report Data • Editing and transmitting report templates Ð Connect the test instrument directly via cable Z3241 with the PC. Note Do not connect the PC to the PSI module.
4 Performing Tests Each of the following tests is automatically assigned to one currently available object number. Any given test which is saved to memory with the “STORE” key is stored with reference to this number. The object number can be entered in the “DUT data” menu (see chapter 5.1 on page 48). Measuring mode operation is always carried out according to the following sequence: • Select the desired test. • Enter test parameters (if required). • Start the measurement or return to the initial menu.
4.1.1 Setting Test Parameters ! Attention! Do not touch the test probes during measurement! A direct voltage of up to 5000 V is present between the test probes. Note Testing the Measurement Cables: Initial testing should be performed after short-circuiting the measurement cables with their test probes. The instrument should display nearly zero MΩ. A broken measurement cable can be detected in this way.
Significance of Parameters with Variable and Fixed Test Voltage Test voltage Unom: Test voltage in fixed steps (100/250/500 V, 1.00/1.50/2.00/2.50/5.00 kV) Uvar: Variable test voltage (100 V … 5.00 kV in 50 V steps) Test voltage Uins Limit Rins Limit value for insulation resistance (If value stays below limit value: measurement failed) Test duration Maximum test duration in seconds : measurement until steady state is reached Time in sec.: Measurement = 1 to 120 seconds >>>>: cont.
4.1.4 Data logger function (min log)(as of firmware version AH) MENU Statistical analysis Select Parameter Press the CURSOR DOWN or CURSOR UP keys to return to the previous LCD display. If you choose time parameter setting "min log" from the menu, exactly 30 measured values are automatically stored during the selected test duration at time intervals between 4 seconds and 2 minutes. This makes data logger operation possible for measuring durations between 2 and 60 minutes.
4.1.5 Measurements with the Guard Cable (feature G1) The measurement of very high resistances necessitates extremely minimal measuring current and may be rendered problematic as a result of influences such as electromagnetic fields, humidity or surface current. An accurate test set-up is thus absolutely essential. A guard cable must be used for measurements within a range of 100 GΩ (10 GΩ) … 1 TΩ, in order to prevent surface current from distorting measurement results.
4.2 High-Voltage Test with Feature B1/B2 The electrical equipment of the machine under test must withstand a test voltage of twice its own rated voltage value or 1000 V~ (whichever is greater) applied between the conductors of all circuits and the protective conductor system for a period of at least 1 second. The test voltage must have a frequency of 50 Hz, and must be generated by a transformer with a minimum power rating of 500 VA. b) Voltage Test Ð Set the key switch to the “I” position.
d) Power Failure Attention High-Voltage! Touch neither the test probes nor the device under test during the high-voltage test! Life endangering high-voltage of up to 5.3 kV is present at the test probes of the high-voltage module! Ð Pull the trigger of the identified high-voltage switching pistol to the limit stop and hold. • The following values and symbols appear at the LCD: UT = acquired voltage value IT ∼ 00.0 mA or 0.
4.2.2 Setting Test Parameters for High-Voltage Testing The following parameters can be set in the “standby” mode with illuminated green signal lamps: MENU Test v. UAC.MAX. AC-HV Max. test voltage, final value after TR has elapsed Setting limits: HP-2.5kV: 250 V … 2.50 kV HV-5.4kV: 650 V … 5.35 kV IMAX.: Max. allowable current before high-voltage is switched off Setting limits: HP-2.5kV: 10.0 … 250 mA HV-5.4kV: 0.50 … 10.0 mA The pulse mode symbol >>>>>>> can be selected with the key at less than 10.
4.2.3 High-Voltage Testing Sequence ! Ð Pull both triggers, but only pull the trigger at the high-voltage switching pistol up to the first point of mechanical resistance. Attention! Before initializing any tests, and before enabling the test equipment, make sure that all means of access to the danger zone are closed, and that all persons have exited the danger zone. Ð Set the key switch to the “I” position. The test probes are enabled. Ð Establish contact with the electrical circuits.
Saving Measured Values After the test sequence has been completed, the last measured UT and IT values remain at the display. Results can be saved to memory with or without a comment. An automatically generated consecutive number is assigned to the results for allocation to the respective test. A description with up to 15 characters can be entered for the measurement to the field at the bottom left. See chapter 5.1.1 on page 49 regarding entry.
4.2.4 Pulse Control Mode 4.2.5 Ending the High-voltage Test We recommend selecting the pulse control mode for troubleshooting purposes (arc-over pinpointing). Interrupting current IMAX is fixed to a value of approximately 125 mA with feature B1, and to approximately 5 mA with feature B2 in the pulse control mode. If this value is exceeded, test voltage is switched off within 0.5 ms. After approximately 0.6 s, test voltage is increased from 0 to its final value within a period of 0.
4.3 Polarization Index Measurement A polarization index test is recommended for electrical machines. This procedure involves expanded testing of insulation resistance. DC measuring voltage from the MERISO PRIME+ is applied to the insulation for a duration of 10 minutes. Measured values are documented after one minute, and after ten minutes. If the insulation is good, the value measured after ten minutes is higher than the value measured after one minute.
4.3.1 Setting Test Parameters MENU 4.3.2 Starting the Test START Select Parameter Set Value Significance of Parameters Uins[nom] Nominal insulation voltage 100/250/500 V, 1.00/1.50/2.00/2.50/5.00 kV PI(t2/t1) Polarization index PI is the relationship between insulation resistance values measured after 1 minute PI(t1), and after 10 minutes PI(t2). Other durations can be selected if required.
4.4 Breakdown Voltage Step-Voltage Test – DC Charging Test Voltage is increased up to the limit value (selected maximum test voltage) over the selected rise time during the breakdown voltage test. If voltage breakdown occurs before this value is reached, breakdown voltage Ubrk is displayed. If the selected test voltage is reached, testing is continued at this voltage level until the time period selected under “test duration” has elapsed.
4.4.1 Setting Test Parameters 4.4.2 Starting the Test START Set Parameters Significance of Parameters with Variable and Fixed Test Voltage Test voltage Unom: Test voltage in fixed steps (100/250/500 V, 1.00/1.50/2.00/2.50/5.00 kV) Uvar: Variable test voltage (100 V … 5.
4.5 Capacitance Measurement and Determination of Dielectric Discharge (optional) Capacitance measurement is performed with adjustable test voltage by charging with constant current. The measurement is performed with automatic range selection. One of the nominal test voltages (Unom), or a freely selectable test voltage (Uvar) can be used. Dielectric Discharge Test (DD) This test was developed for use with large machines and is performed, as its name indicates, during discharge.
4.5.2 Starting the Test START After capacitance has been determined, the instrument automatically continues with dielectric discharge testing. This takes about 30 minutes. However, the measurement can be aborted at any time by pressing the MENU key. Only capacitance is displayed in this case. STORE Press briefly: Save results Press & hold: Save results and activate the entry field: A description of the measurement with up to 15 characters can be entered to the information field at the bottom.
4.6 Voltage Measurement (protection against residual voltage) EN 60204 requires that voltages in excess of 60 V occurring at all accessible machine components during operation must drop to a residual voltage value of 60 V or less within a period of 5 seconds after supply power has been switched off. Testing for the absence of voltage is performed by means of a voltage measurement which involves measuring discharge time with the MERISO PRIME+.
4.6.1 Setting Test Parameters The discharge time during which the voltage value must drop to a non-hazardous value of less than 60 V can be specified as a limit value between 1.0 and 9.00 seconds. The following message appears in order to indicate that the limit has been reached: “residual voltage less than 60 V!”.
5 Processing, Reorganizing and Deleting Data Previously stored data and data records can be processed with the selector switch in the data management position. The following functions are available: • DUT data An object number can be assigned here, and measurements can be saved with reference to the selected number. Beyond this, a description can be entered for the respective object. • Data Processing Individual data resulting from a measurement (e.g.
5.1.1 Entering Descriptions – Entry using keys at the MERISO PRIME+ Select Letter, Number or Character. STORE MENU Description Move Cursor Left START Description: A description can be entered here for an object, which is displayed and subsequently printed out when the respective object is selected.
5.1.2 Copying Descriptions 5.2 Ð Select the object with the description to be copied and press the MENU key 3 times. Measured values can be checked with this function, and individual measurements can be deleted if desired. Processing Data (checking measured values) Ð Select the new object and press the MENU key. The copied text is displayed and can be edited. 5.1.3 Deleting Descriptions Ð Simultaneously press the i/STORE and START keys.
5.3 Data Reorganization 5.3.1 Deleting Already Printed Data Data for individual DUTs which have already been printed out in report form, or DUTs which have been entered although no measured values have been saved for them yet, can be deleted here if desired. print-out is generated including all DUTs for which measured data are stored to memory. 5.3.2 Memory Test The memory module is checked for errors with this function. Errors can be corrected in some cases.
5.4 Clearing the Memory This command deletes data records previously saved to memory for all DUTs. Full memory capacity is made available by means of this procedure. ! A security acknowledgement must be entered before memory is cleared. Final deletion is initialized with the i/STORE key. Attention! Data should be downloaded to a PC and saved before clearing the memory! STORE Clearing the memory entirely may takes several seconds. “Memory cleared” is then displayed.
6 Printing Test Results The test instrument’s report functions can be activated with the selector switch in the printer position. The following functions are available: • Print out values at the PSI module (feature I1): Measured values for a selected object can be printed out at the utilized printer module via the serial interface. • Download templates from a PC (see WinProfi PC software in chapter 3.7.5): Report layouts can be specified by the user.
7 Characteristic Values Standards VDE regulations Insulation Test Voltage Nominal Values, Test Voltage DIN EN 61557-1:2007 DIN EN 61557-2:2008 VDE 0413 Part 1:2007 VDE 0413 Part 2:2008 Variable Test Voltage Test Voltage Intrinsic Uncertainity Measuring Uncertainty 0.00 M ... 50.0 G 0.60 M ...10.0 G 100 V ...250 V ±(10% rdg. + 5 d) ± (15% rdg. + 7 d) ±(25% rdg. + 5 d) ± (50% rdg. + 20 d) >10.0 G...50.0 G 0.00 M ... 250 G 0.40 M...50.0 G >250 V ... 1.00 kV >50.0 G...250 G 0.00 M ...
Capacitance Measurement Display Range Measuring Range 0.00 …10.0 μF 0.10 … 5.00 μF Test Voltage Intrinsic Uncertainty Measuring Uncertainty 100…450 V ± (10% rdg. + 5 d) ± (15% rdg. + 8 d) 500…5 kV ± (5% rdg. + 5 d) ± (10% rdg. + 8 d) Dielectric Discharge (DD) Power Supply PROFITEST 204HP/HV Line voltage 207 V … 253 V / 49 Hz … 61 Hz Power consumption PROFITEST 204HP-2.5kV: max. 700 VA PROFITEST 204HV-5.4kV: max. 100 VA Electrical Safety Standards Limit DD 0.10 ... 2.00 ... 9.
Electromagnetic Compatibility (EMC) MERISO PRIME+ Product standards EN 61326-1:2006 Interference Emission EN 55022 Class A Interference Immunity Test Value EN 61000-4-2 Contact/atmos. – 4 kV/8 kV EN 61000-4-3 10 V/m EN 61000-4-4 Mains connection – 2 kV EN 61000-4-5 Mains connection – 1 kV EN 61000-4-6 Mains connection – 3 V EN 61000-4-11 0.5 period / 100% Warning! This is a class A device. This device may cause radio interference in residential areas.
8 Data Interfaces 8.1 RS 232 Serial Interface The data interface socket connector (4) is used to connect the SECUTEST PSI module (feature I1), a barcode scanner (accessory no. B3261) or the PROFI-MFII interface adapter (accessory no. Z504H) for entering data with a PC keyboard. Test results can be printed out at the SECUTEST PSI as a report by listing measured values only. An IBM compatible PC can also be connected to this interface, thus allowing for data exchange.
9 Displays and Error Messages – Causes – Remedies Displays and Error Messages Meaning / Cause MERISO PRIME+ Remedy Test Sequence Countdown runs here until residual voltage is less than 60 V. All-clear after an insulation test: voltage at test probes less than 25 or 60 V depending upon measuring function The test has been passed. The test results are not within allowable limit values. LCD does not light up – Mains cable not plugged in – Mains fuse is blown – Plug in the mains cable (see chapter 3.
Displays and Error Messages Meaning / Cause Remedy An error has occurred while saving data to memory. Save data to a PC and then clear the memory. See text at the display. Press the START key to repair. Memory in no longer able to save new measurement data. Save data to a PC and then clear the memory. See text at the display. Transmit data to a PC or print them out, and then delete DUTs which are no longer necessary, or clear the entire memory. No data have yet been saved to this data record.
Displays and Error Messages Meaning / Cause Remedy The measurement has been saved to memory. MERISO PRIME+(with feature B1 or B2) Green signal lamps do not light up. The displayed high-voltage module has been detected. Turn device on with key switch. The displayed high-voltage module has been detected. Turn device on with key switch. The displayed high-voltage module has not been detected.
10 10.1 ! ! Maintenance Replacing the Mains Fuse Attention! Disconnect the device from the measuring circuit at all poles before opening the fuse compartment! Disconnect the device from the mains. 10.2 Attention! Use only specified, original replacement fuses! Bypassing or repairing fuses is prohibited! If fuses with other current ratings, breaking capacities or blowing characteristics are used, the device may be damaged! Ð Open the fuse compartment at the inlet socket with a suitable tool (e.g.
10.4 Measurement Cables Inspect the measurement cables for mechanical damage at regular intervals. ! 10.5 Attention! Even if only minimal damage is discovered at the test cables, it is advisable to send them immediately to GMC-I Service GmbH. High-Voltage Module Test Cables (Feature B1/B2) Wind the test cables onto the provided cable uptakes at the back of the trolley (feature D1) after each use if included.
Note After updating the software, reinstall the desired language to the test instrument as well, even if the language will not be changed. This assures that all of the additional functions included in the update are correctly displayed. 10.8 Recalibration The respective measuring task and the stress to which your measuring instrument is subjected affect the ageing of the components and may result in deviations from the guaranteed accuracy.
11 Appendix 11.2 11.1 Glossary Table for determining minimal display values for insulation resistance in consideration of the instrument’s measuring error: Abbreviation Meaning Minimum Display Values in Consideration of Measuring Error DAR Absorption Ratio: Ratio between insulation resistance values measured after 30 and 60 seconds DD Dielectric Discharge ΔRLim Maximum allowable statistical deviation from the measured mean value Δt/250V Dwell Time per Step 0.10 MΩ 0.
11.
11.4 Index B Beeper acoustic . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Current limiting in the event of arc-over . . . . 13 D 51 50 50 50 49 49 58 52 48 51 53 48 Discharge Automatic after insulation test . . . . . . . . 29 Dielectric during capacitance measurement . 44 E Electrical isolation . . . . . . . . . . . . . . . . . . . . . . . 13 66 S Fuses Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 Repair and Replacement Parts Service, Calibration Center* and Rental Instrument Service When you need service, please contact: GMC-I Service GmbH Service Center Thomas-Mann-Str. 20 90471 Nürnberg, Germany Phone: +49 911 817718-0 Fax: +49 911 817718-253 e-mail: service@gossenmetrawatt.com www.gmci-service.com This address is only valid in Germany. Please contact our representatives or subsidiaries for service in other countries.
13 Product Support When you need service, please contact: GMC-I Messtechnik GmbH Product Support Hotline Phone: +49 911 8602-0 Fax: +49 911 8602-709 e-mail support@gossenmetrawatt.com Edited in Germany • Subject to change without notice • A pdf version is available on the internet. GMC-I Messtechnik GmbH Südwestpark 15 90449 Nürnberg • Germany Phone +49 911 8602-111 Fax +49 911 8602-777 E-Mail info@gossenmetrawatt.com www.gossenmetrawatt.
