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Gossen MetraWatt METRA HIT 27EX, Operating Instructions Manual, Page: 21 / 36

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Gossen MetraWatt METRA HIT 27EX Operating Instructions Manual Download Page 21

GMC-I Messtechnik GmbH

21

GB

8.6

Transmission Mode Operation with RS 232 or USB Interface

The METRA HIT

⏐

27EX

 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. The adapter’s RS 232 or USB 
interface allows for the establishment of a connection to 
the PC via an interface cable. Beyond this, commands and 
parameters can be transmitted from the PC to the 
instrument as well. The following functions can be 
executed:
•

Configuration and read-out of measuring parameters

•

Measuring function and measuring range selection

•

Start measurements

•

Read out measured values.

Activating the Interface

The interface is switched on manually as described below 
for transmission mode operation. The instrument 
continuously transmits measurement data to the PC via the 
interface adapter in this operating mode. The interface is 
activated automatically by the PC for receiving operation 
(i.e. the instrument receives data from the PC).

Starting Transmission with Menu Functions

InFO 

 SEnd 

 

StArt 

The

 symbol blinks at the display in order to indicate 

interface operation.

Automatic Activation and Deactivation of the Transmission Mode

If the sampling rate is 20 s or longer, the display is 
switched off automatically between samples in order to 
prolong battery service life.
Exception: continuous operation
As soon as an event occurs, the display is automatically 
switched back on.

Configuring Interface Parameters

Addr – Address

If several milliohmmeters are connected to the PC via inter-
face adapters, an unique address must be assigned to 
each device. Address 1 should be used for the first device, 
address 2 for the second etc. If only one milliohmmeter is 
utilized, an address between 1 and 14 should be used. 
Address 15 is not used for addressing, i.e. the device with 
address 15 always responds, regardless of the actual 
address.

Summary of Contents for METRA HIT 27EX

Page 1: ...Operating Instructions METRA HIT 27EX Milliohmmeter for deployment in potentially explosive atmospheres 3 349 336 49 9 8 16 ...

Page 2: ...ems against direction of flow increase values 4 MAN AUTO key for manual measuring range selection Operating mode menu Selection of individual menu items in direction of flow decrease values 5 MENU ESC Operating mode menu Exit menu level and return to a higher level exit parameters configuration without saving data 6 LED OK blinks valid measured value 7 LED ERROR blinks incorrect connection 8 Conne...

Page 3: ... mode 4 REM Memory mode operation disappears after communication via the interface is ended by means of key or switch operation 5 ZERO Zero balancing 6 MAN Manual measuring range selection 7 Unit of measure if blinking refer to chapter 11 on page 33 8 Low battery voltage replace batteries I Measurement input U Sense for 4 wire measurement U Sense for 4 wire measurement I mΩ Ω measurement input 1 2...

Page 4: ... the Menus from the Initial InFO Menu to Operating and Measuring Parameters 17 8 1 Sampling rAtE 17 8 2 Saving Measured Values 18 8 2 1 Memory Mode DATA Key Function see also chapter 6 1 18 8 2 2 Memory Mode Operation STORE Menu Function 19 8 3 Querying Memory Occupancy INFO MEMO OCCUP 19 8 4 Clearing the Memory MEMO CLEAr 20 8 5 Activating the Default Values 20 8 6 Transmission Mode Operation wit...

Page 5: ...N 60079 11 2012 When used for its intended purpose safety of the operator as well as that of the instrument is assured Their safety is however not guaranteed if the instrument is used improperly or handled carelessly In order to maintain flawless technical safety conditions and to assure safe use it is imperative that you read the operating instructions thoroughly and carefully before placing your...

Page 6: ...nt Operation by qualified electricians The instrument may only be operated by persons who are capable of recognizing shock hazards and taking the appropriate safety precautions Shock hazards exist anywhere where voltages of greater than 33 V RMS may occur Shock Hazards Avoid working alone when taking measurements which involve shock hazards Be certain that a second person is present Measurement Ca...

Page 7: ... Replacement and Balancing When the instrument is opened voltage conducting parts may be exposed The instrument must be disconnected from the measuring circuit before the performance of repairs the replacement of parts or balancing If balancing maintenance or repair of a live open instrument is required this may only be carried out by trained personnel who are familiar with the dangers involved De...

Page 8: ...as the key is held depressed all of the seg ments at the LCD are illuminated The LCD is shown on page 2 Power up is acknowledged with a brief acoustic signal The instrument is ready for use as soon as the key is released Switching the Instrument On with a PC After transmission of a data frame from the PC the mil liohmmeter is switched on See also chapter 8 6 Switching the Instrument On Automatical...

Page 9: ...his ends both memory mode and transmission mode operation We recommend setting the instrument to continuous operation for transmission mode operation The continuous operation mode is not effected by auto matic shutdown Disabling Automatic Shutdown The instrument can be set to continuous operation Press and hold the MENU ESC key and then switch the instrument on by pressing the ON OFF key Continuou...

Page 10: ...tching the instru ment off and then back on again Note If the red ERROR LED lights up and OL is shown on the display during manual measuring range selection you should switch to the next higher range 4 3 Quick Measurements If you wish to perform quicker measurements than those possible with the automatic measuring range selection function make sure to establish the appropriate measuring range and ...

Page 11: ... The selected unit of measure is displayed as well 0L overload appears if the measuring range upper limit is exceeded for the following measured quantities the red ERROR LED lights up simultaneously and openl appears on the auxiliary display 300 mΩ 3 Ω 30 Ω 30999 30 mΩ 3099 The digital display is refreshed at different frequencies for the various measured quantities The main display appears immedi...

Page 12: ...ts with the test probes requires your full attention Preparation of Measurement Memory should be cleared before starting a measurement series with the DATA key function This assures on the one hand that adequate memory capacity is available and on the other hand that only data from the last measurement series are read out in a contigu ous fashion Check current memory occupancy to this end INFO MEM...

Page 13: ...by pressing the DATA key The message data blinks and indicates readiness for acquiring the next measured value As long as the DATA function is active and all measure ments are within the measuring range which has been Acoustic signal 1x 0 L openl Ω 0 L 0 l data Ω DATA 044 66 044 59 data mΩ MAN Acoustic signal 2x Meas Contact 044 66 openl data mΩ MAN Acoustic signal 2x Disconnect contact Acoustic s...

Page 14: ...hese two points add to the measured resistance value These include contact resistance as well as cable resistance If a very low resistance value needs to be measured for example contact resistance at a contactor with a value of only a few milliohms the points between which voltage is measured must be moved out of the measuring instrument and positioned as closely as possible to the device under te...

Page 15: ... automatic thermovoltage compensation for the 30 mΩ and 300 mΩ measuring ranges will be per formed in the background for all future measurements ZERO signals that the value of the thermovoltage has already been taken into account for the indicated measu ring result After the first measurement lift the test probe from the measuring point termoc disappears to facilitate the rea ding of the measured ...

Page 16: ...esired measuring range using the MAN AUTO key 30 mΩ 300 mΩ 3 Ω or 30 Ω Contact the measuring point The green LED OK must light up Note If the measuring current is interrupted during 4 wire mΩ measurement or if the fuse F1 is defec tive the message open L flashes on the display and the red LED ERROR lights up If fuse is defective see chapter 10 2 mΩ U U Rx Voltage Drop Measuring Current mΩ 0 01 mΩ ...

Page 17: ...desired parameter or the desired function is se lected by repeatedly pressing the keys Acknowledge with the key in order to change the corresponding parameter or parameters After the desired digit has been selected with the keys and the value has been adjusted with the keys the next digit is accessed with the key or the display is returned to the start menu or switched to the next submenu The meas...

Page 18: ...artz movement and has an average capacity of 1000 measured values Minimum capacity is 800 measured values and maximum capacity is 1200 measured values Data are stored and can be transmitted directly to a PC with the METRAwin 10 software Date and time must be reset if the batteries are depleted and or replaced Measured values are stored in so called blocks Measured values resulting from the same me...

Page 19: ...s switched on and off automatically at sampling rates of long duration see chapter 3 When memory capacity has been exhausted MEMO FULL appears at the display and an acoustic signal is generated simultaneously The signal can be deactivated by pressing any key REM Display The REM symbol indicates that memory mode operation has been activated via menu function STORE Press the key if you wish to monit...

Page 20: ...g memory mode bUSYMEMO is displayed instead of CLEAR 8 5 Activating the Default Values Previously entered changes can be undone and the default settings can be reactivated This may be advisable after the occurrence of software or hardware errors Simultaneously press and hold the MENU ESC MAN AUTO and DATA CLEAR keys and switch the instrument on with the ON OFFkey ...

Page 21: ...ument continuously transmits measurement data to the PC via the interface adapter in this operating mode The interface is activated automatically by the PC for receiving operation i e the instrument receives data from the PC Starting Transmission with Menu Functions InFO SEnd StArt The symbol blinks at the display in order to indicate interface operation Automatic Activation and Deactivation of th...

Page 22: ...us and Submenus 1nf0 mem0 send Set MENU ESC ON Clear yes no send 0ff 0n start st0p Current Status 3 9 batt V 801 mem0 oCCUp set rate Battery Voltage Level Memory Occupancy see chapter 8 3 store store 0ff 0n start st0p 2x ESC ESC ESC ESC ...

Page 23: ...er 8 4 Transmission Mode see chapter 8 6 Configure Device Parameters see chapter 8 1 Query Information tCal 1508 02 Calibration Date tadJ 1508 02 Balancing Date blinks does not blink Display EMPTY Memory is empty Memory Mode Menu StArt blinks Activate Memory mode active StOP blinks Activate Memory mode inactive REM is displayed REM disappears During memory mode the memory cannot be deleted bUSYMEM...

Page 24: ...esstechnik GmbH SEt Submenu for rAtE Addr dAtE and tIME Parameters set rate set addr set tIme set 00 10 00 rate set 15 addr set 13 15 21 tIme set 13 08 02date Continued from previous page set date ESC ESC ESC ESC ...

Page 25: ...alue Set Device Address Acknowledge Address Change Value Set Time Acknowledge Selection Set Date Select Position Change Value Acknowledge Selection Select Position Possible Settings Possible Settings Digits blinks Possible Settings see also chapter 8 6 0 15 Set Sampling Rate see also chapter 8 1 hh mm ss h hours m minutes s seconds hh mm ss hh hours mm minutes ss seconds TT MM JJ TT day MM month J...

Page 26: ...Temperature Influence 50 ppm K Reference Conditions Ambient temperature 23 C 2 K Relative humidity 40 60 Battery voltage 5 0 V 0 1 V Measuring Function Measuring Range Resolution at Upper Range Limit 4 30000 3 3000 1 Open circuit voltage approx Meas cur rent approx mΩ 4 L 30 mΩ 0 01 mΩ 4 6 V 100 mA 300 mΩ 0 01 mΩ 100 mA 3 Ω 0 1 mΩ 10 mA 30 Ω 1 mΩ 10 mA Measuring Function Intrinsic Error at Max Res...

Page 27: ...nt is OK LED ERROR red lights up when measuring cur rent is interrupted invalid measu rement poor contact when 0 L is displayed Power Supply Batteries 4 x 1 5 V PhilipsLonglife R6L4B LR6 AA Size Service life 1 measuring cycle 5 s Additional consumption for Interface operation 0 5 mA LCD illumination 40 mA at 6 V Battery test Range mΩ 100mA is displayed automatically if battery voltage drops below ...

Page 28: ...Explosion category T4 Temperature class Gb Equipment Protection Level EPL Tamb 10 C 50 C Tamb ambient temperature Prototype test certificate INERIS 05ATEX0040 INERIS Inspection and Certifi cation Authority 05 Year ATEX Guideline Atmospheres Explosives 0040 Test Report No Serial number fabrication number X Y 123456 X year of manufacture A 2016 B 2017 Y month of manufacture January A February B Marc...

Page 29: ...a infrared light through the housing read data and configure parameters With interface adapter as accessory USB HIT IR to USB 1 1 USB 2 0 single channel operation baud rate MM PC 9600 baud Ambient Conditions Accuracy range 0 C 40 C Operating temperatures 10 C 50 C Storage temperatures 25 C 70 C w o batteries Relative humidity 45 90 no condensation allowed Elevation up to 2000 m Mechanical Design P...

Page 30: ...f the batteries which may result in damage under unfavorable conditions Checking Battery Voltage Level and Condition The current battery voltage level can be queried in the Info menu see chapter 8 on page 17 MENU ESC ON OFF InF0 X X V bAtt Make sure that no battery leakage has occurred before ini tial start up and after long periods of storage Continue to inspect the batteries for leakage at short...

Page 31: ... set the housing base onto the housing top and align accurately see photo below Then press the two housing halves together first at the bottom front a and then at the top front b Secure the housing base with the two screws Warning The instrument may not be operated if the housing base has not been properly installed and secured Disposing of Batteries Dispose of old batteries properly i e at a desi...

Page 32: ...ill be subjected to a safety test Instructions for the service 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 Open the instrument in the same manner as for replac ing the batteries Warning Use the specified type tested fuses ...

Page 33: ...hargeable batteries may contain harmful substances or heavy metal such as lead PB cadmium CD or mercury Hg They symbol shown to the right indicates that batteries or rechargeable batteries may not be disposed of with the trash but must be delivered to collection points specially provided for this purpose 11 System Messages The following messages appear at the main display or the auxiliary displays...

Page 34: ...lternating voltage AC value AC active power AC apparent power DC power capacitance frequency and temperature Competent Partner GMC I Messtechnik GmbH is certified per DIN EN ISO 9001 Our DAkkS Calibration Laboratory has been accredited in accordance with DIN EN ISO IEC 17025 by the Deutsche Kalibrierdienst German Calibration Service under registra tion number D K 15080 01 01 Our competence in the ...

Page 35: ... to the specified technical data at the time of cali bration We guarantee the observance of the specified technical data within the admissible tolerance limits for a period of 12 months from delivery 14 Product Support If required please contact GMC I Messtechnik GmbH Product Support Hotline Phone 49 911 8602 0 Fax 49 911 8602 709 E Mail support gossenmetrawatt com French subsidiary GMC Instrument...

Page 36: ...r mechanical stress a calibration interval of 2 3 years is usually sufficient During recalibration in an accredited calibration laboratory DIN EN ISO IEC 17025 the deviations of your instrument in relation to traceable standards are measured and docu mented The deviations determined in the process are used for correction of the readings during subsequent application We are pleased to perform DAkkS...

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