Gossen MetraWatt METRA HIT 27EX Operating Instructions Manual
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Gossen MetraWatt METRA HIT 27EX Operating Instructions Manual

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Operating Instructions
METRA
HIT⏐27EX
Milliohmmeter for deployment
3-349-336-49
in potentially explosive atmospheres
9/8.16

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Summary of Contents for Gossen MetraWatt METRA HIT 27EX

  • Page 1 Operating Instructions METRA HIT⏐27EX Milliohmmeter for deployment 3-349-336-49 in potentially explosive atmospheres 9/8.16...
  • Page 2 → chapter 5 → chapter 3 → chapter 6 → chapter 4 → chapter 7.2 → chapter 7.3 → chapter 7.3 → chapter 7 Measurement only on voltage-free objects! Display (LCD) ON|OFF key for ON / OFF (ON short: instrument ON → ON short: background illumination ON → →...
  • Page 3 Symbols used in the Digital Display Main display with decimal point Auxiliary displays : Milliohmmeter in continuous operation, ON blinks at transmission frequency in transmission mode REM: Memory mode operation, disappears after communication via the interface is ended by means of key or switch operation ZERO: Zero balancing MAN: Manual measuring range selection...

  • Page 4: Table Of Contents

    Contents Page Application .............. 5 Safety Features and Precautions ......5 Initial Start-Up ............8 Selecting Measuring Functions and Measuring Ranges .10 Automatic Measuring Range Selection ........ 10 Manual Measuring Range Selection ........10 Quick Measurements ............10 Triple Digital Display ..........11 Measured Value Storage ........

  • Page 5: Application

    Application 27EX METRA HIT⏐ is a milliohmmeter with 4-pole measure- ment, which is designed for deployment in potentially explosive environment. In accordance with directive 2014/34/EU the device is approved for being used in explosive, gaseous atmo- spheres (IIA T4) with ambient temperatures between – 10 °C and +50 °C.
  • Page 6 – Measurements may only be performed within the indi- cated ambient conditions. See page 29 for operating temperature range and relative humidity. – The instrument may not be used in a dusty atmo- sphere. – No maintenance operation may be performed in potentially explosive atmospheres (cleaning, replace- ment of batteries, opening the device, etc.) Observe the following safety precautions:...
  • Page 7 ing circuits highly resistive for the duration of the over- load when high currents occur as a result of a distur- bance. Another fuse F2 is located in the path between batteries and instrument. • Dusty Atmosphere The instrument may not be used in a dusty atmosphere. Meanings of symbols on the instrument: Warning concerning a source of danger (attention: observe documentation!)

  • Page 8: Initial Start-Up

    Initial Start-Up Insert Batteries Warning! Remove the instrument from the potentially explo- sive environment before opening. Only use the included type-tested batteries, as in- dicated in the Characteristic Values. Refer to chapter 10.1 regarding correct battery installation. Note! As a result of internal voltage monitoring, the instru- ment may respond as follows if the battery voltage level is low: –...
  • Page 9 Shutdown is acknowledged with two, brief acoustic sig- nals. Switching the Milliohmmeter Off Automatically – „SLEEP MODE“ The instrument is switched off automatically if none of the keys are activated for approximately 10 minutes. Shut- down is acknowledged with a brief acoustic signal. Transmission mode: In this case, checking is first performed to determine whether or not the sampling rate has been set to a value of greater than 10 s.

  • Page 10: Selecting Measuring Functions And Measuring Ranges

    Selecting Measuring Functions and Measuring Ranges Automatic Measuring Range Selection The milliohmmeter is equipped with auto-ranging for all measuring ranges. Auto-ranging is active as soon as the instrument is switched on. The instrument automatically selects the measuring range which allows for highest pos- sible resolution for the applied quantity.

  • Page 11: Triple Digital Display

    • via DATA function, see chapter 6.1. After the first mea- surement, the proper measuring range will be auto- matically determined so that measurements are per- formed more rapidly from the second measured value onwards. With both functions, the established measuring range is maintained for the subsequent series mode measurments.

  • Page 12: Measured Value Storage

    Measured Value Storage 27EX The METRA HIT⏐ provides two entirely different options for storing data: • Measured Value Memory – DATA Key Function: Each time the DATA key is pressed and a measuring point is contacted, a measured value is stored (see chapter 6.1).
  • Page 13 The red LED ERROR lights up as long as no contact has been established between the test probes and the mea- suring point. The green LED OK continues to light up when a valid measured value has already been stored. Prior to contacting the next measuring point, the function DATA must be activated once more by pressing the DATA key.

  • Page 14: Milliohm Measurement (4-Pole-Measurement)

    automatically adjusted, the measuring ranges should not be changed manually. The DATA function is deactivated if the DATA|CLEAR key is pressed and held (approx. 1 s) or by switching the instru- ment off and back on again. Milliohm Measurement (4-Pole-Measurement) Compensation of Cable Resistance Electrical resistance is a dipole quantity which can generally only be measured using two poles.

  • Page 15: Thermovoltage Compensation

    Thermovoltage Compensation Thermovoltages which occur as a result of material and temperature differences may distort measurement results. For this reason, the instrument is equipped with automatic thermovoltage compensation in the relevant measuring ranges. After switching on the milliohmmeter, „termoc“ is displayed, indicating that an automatic thermovoltage compensation for the 30 mΩ...

  • Page 16: Milliohm Measurement With ≤ 100 Ma Dc [Mω]

    Milliohm Measurement with ≤ 100 mA DC [mΩ] ➭ Make sure that the device under test is voltage-free. ➭ Connect the device under test as shown. Note: mΩ When using KC27 or I– U– KC4 always set red probe plug at U –...

  • Page 17: Using The Menus - From The Initial Info Menu To Operating And Measuring Parameters

    Using the Menus – from the Initial InFO Menu to Operating and Measuring Parameters Menu-driven operation via the initial „1NF0“ menu allows the user to query online help, activate the memory and query memory occupancy, activate the interface and configure device parameters. ➭...

  • Page 18: Saving Measured Values

    Saving Measured Values 27EX The METRA HIT⏐ provides two entirely different options for storing data: • Messwertspeicherung – Tastenfunktion DATA: Measured Value Memory – DATA Key Function: Each time a measuring point is contacted, a measured value is stored in accordance with a defined condition (see chapter 6.1 and chapter 8.2.1).

  • Page 19: Memory Mode Operation - Store Menu Function

    8.2.2 Memory Mode Operation – STORE Menu Function ➭ First set the sampling rate for memory mode operation, and then start memory mode operation. The sampling rate can also be changed during mem- ory mode operation. ➭ First select the desired measuring function and an ap- propriate measuring range.

  • Page 20: Clearing The Memory - Memo  Clear

    Clearing the Memory – MEMO  CLEAr Attention! This function deletes all measured values from memory. This function cannot be performed during memory mode; bUSY is displayed instead of CLEAR. MEMO Activating the Default Values Previously entered changes can be undone, and the default settings can be reactivated.

  • Page 21: Transmission Mode Operation With Rs 232 Or Usb Interface

    Transmission Mode Operation with RS 232 or USB Interface 27EX The METRA HIT⏐ is equipped with an bidirectional infrared interface for the transmission of measurement data to a PC. Data are transferred optically through the instrument housing by means of infrared light to an interface adapter (accessory BD232 or USB-HIT), which is attached to the instrument.
  • Page 22 Main Menus and Submenus MENU/ESC     1nf0 3. 9 8 01 ↵ batt mem0 oCCUp Battery Memory Occupancy (see chapter 8.3) Voltage Level    store store  0ff/0n start/st0p    mem0 Clear  ...
  • Page 23 Query Information         t im e d a t e t C a l t a d J 1508. 02 1508. 0 2 1508. 02 Current Time Current Date Calibration Date Balancing Date Memory Mode Menu ...
  • Page 24 SEt Submenu for rAtE, Addr, dAtE and tIME Parameters Continued from previous page   rate 00:10:00 rate     tIme 13:15:21 tIme     date 02 date     addr addr GMC-I Messtechnik GmbH...
  • Page 25 Set Sampling Rate (see also chapter 8.1)    Change Acknowledge Value Sampling Rate Possible Settings (hh:mm:ss, h = hours, m = minutes, s = seconds) 00:00:01, 00:00:02, 00:00:05, 00:00:10, 00:00:20, 00:01:00 00:02:00, 00:05:00, 00:10:00, 00:20:00, 01:00:00; 0.50 = 500 ms Set Time ...

  • Page 26: Characteristic Values

    Characteristic Values Resolution at Upper Range Limit Measuring Measuring Function Range Open-circuit Meas. cur- 4¾ 30000 / 3¾ 3000 voltage approx. rent approx. 30 mΩ 0.01 mΩ 100 mA mΩ 300 mΩ 0.01 mΩ 100 mA 4 … 6 V Ω...
  • Page 27 Response Time Response time (after manual range selection) Response Time Measured Quantity Measuring Range for Digital Display Step Function from ∞ to 50% mΩ, Ω 1.5 s of upper range limit value without parallel capacity Display Elements LCD panel (65 mm x 30 mm) with triple 7 segment display (measured values), units of measure and various special functions.
  • Page 28 Electrical Safety Safety class II per IEC 61010-1:2010/ EN 61010-1:2011/ VDE 0411-1:2011 Measurement category 50 V CAT I Contamination degree EX marking CE 0080 II 2 G Ex ia IIA T4 Gb Ex = prototype tested = Device group = Device category = Atmosphere (gas) Ex = conforms to European Ex standards...
  • Page 29 Serial plate GOSSEN METRAWATT manufacturer Thomas-Mann-Str. 16-20 street D-90471 Nürnberg post code / place METRA HIT 27EX designation of device INERIS 05ATEX0040 prototype test certificate see above X Y 123456 serial number see above II 2 G EX marking see above...

  • Page 30: Maintenance

    Maintenance 10.1 Batteries Warning! Ex Environment: Remove the instrument from the potentially explosive environment before opening. Attention! Non-Ex Environment: Disconnect the instrument from the measuring circuit before opening to re- place batteries! Removing the Batteries During Periods of Non-Use The integrated quartz clock draws power from the batter- ies, even when the instrument is switched off.

  • Page 31: Fuses

    Replacing the Batteries Warning! Use the included type-tested batteries only, as de- scribed in the Characteristic Values. ➭ Set the instrument face down onto a flat working sur- face, loosen the two screws at the back and lift off the housing base, starting at the bottom.

  • Page 32: Housing And Display

    Inspecting the Integrated Fuse F2 The fuse F2 is located in the battery supply path. If the LC display is not active upon switching the instrument on: ➭ check whether the batteries have been inserted with the polarity symbols at the correct end. If the LCD remains inactive it might be defective.

  • Page 33: Collection Of Used Instruments And Environmentally

    10.4 Collection of Used Instruments and Environmentally Compatible Disposal The milliohmmeter is a category 9 product (monitoring and control instrument) in accordance with ElektroG (German Electrical and Electronic Device Law). This device is sub- ject to the RoHS Directive. Further-more, we make refer- ence to the fact that the current status in this regard can be accessed on the Internet at www.gossenmetra- watt.com by entering the search term WEEE.

  • Page 34: Repair And Replacement Parts Service

    Repair and Replacement Parts Service, Calibration Center* and Rental Instrument Service If required please contact: GMC-I Service GmbH Service Center Thomas-Mann-Straße 20 90471 Nürnberg • Germany Phone +49 911 817718-0 +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 ser- vice in other countries.

  • Page 35: Manufacturer's Guarantee

    Manufacturer’s Guarantee The guarantee period for all METRA HIT digital multimeters and calibration instruments is 3 years after date of ship- ment. The guarantee covers materials and workmanship. Dam- age resulting from use for any other than the intended pur- pose or operating errors, as well as any and all consequen- tial damage, is excluded.

  • Page 36: Recalibration

    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. If high measuring accuracy is required and the instrument is frequently used in field applications, combined with transport stress and great temperature fluctuations, we recommend a relatively short calibration interval of 1 year.

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