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VEGA74 

 

 

EN - 33 

 

9.  MAINTENANCE 

9.1. 

GENERAL INFORMATION 

➢

  While  using  and  storing  the  instrument,  carefully  observe  the  recommendations  listed 

in this manual in order to prevent possible damage or danger during use. 

➢

  Do  not  use  the  instrument  in  environments  with  high  humidity  levels  or  high 

temperatures. Do not expose to direct sunlight. 

➢

  Always switch off the instrument after use. Should the instrument remain unused for a 

long time, remove the batteries to avoid liquid leaks that could damage the instruments 
internal circuits. 

 

9.2. 

RECHARGING AND REPLACEMENT OF THE BATTERIES 

When  the  LCD  display  shows  the  low  battery  symbol  "

"  recharge  the  rechargeable 

batteries or replace the alkaline batteries. 
 
 

CAUTION 

 

 

 

Only  expert  and  trained  technicians  should  perform  this  operation.  Before 
carrying  out  this  operation,  make  sure  you  have  disconnected  all  cables 
from the input terminals. 

 
 

CAUTION 

 

 

 

Do not connect the adapter A0061 if the instrument is powered by alkaline 
(not rechargeable) batteries 

 
1.  Switch off the instrument by pressing the 

ON/OFF

 key. 

2.  Remove the cables from the input leads 
3.  Loosen the battery compartment cover fastening screw and remove the cover. 
4.  Remove  all  the  batteries  (if  not  rechargeable)  from  the  battery  compartment  and 

replace them with new batteries of the right type only (§ 10.4), making sure to respect 
the  indicated  polarities.  To  recharge  the  batteries,  use  the  external  battery  charger 

A0061 

supplied  with  the  instrument.  The  symbol  “ ”  is  shown  during  the  recharging 

process.  The  batteries  can  be  considered  as  completely  recharged  after  approx.  12 
hours. 

The external adapter A0061 does not recharge alkaline batteries

. 

5.  Restore the battery compartment cover into place and fasten it by mean of the relevant 

screw. 

6.  Do  not  scatter  old  batteries  into  the  environment.  Use  the  relevant  containers  for 

disposal. 

 

9.3. 

CLEANING THE INSTRUMENT 

Use a soft and dry cloth to clean the instrument. Never use wet cloths, solvents, water, etc. 
 

9.4. 

END OF LIFE 

 

CAUTION

:  the  symbol  on  the  instrument  indicates  that  the  appliance  and  its 

accessories must be collected separately and correctly disposed of. 

 
 
 
 

Содержание VEGA74

Страница 1: ... Copyright HT ITALIA 2022 Release EN 1 00 16 11 2022 VEGA74 User manual ...

Страница 2: ...X Measure and recording of ambient parameters 14 6 3 PQA Measurement and recording of main parameters 17 6 3 1 Connections types 17 6 3 2 General settings 21 6 3 3 Display of measurements 23 6 3 4 Start recording 25 6 4 List of message at display 27 7 OPERATIONS WITH THE MEMORY 28 7 1 Saving measurements 28 7 1 1 Saving snapshots 28 7 1 2 Recalling and deleting snapshots 29 7 1 3 Recall and delete...

Страница 3: ...AL APPENDIXES 39 12 1 Voltage Anomalies 39 12 2 Supply voltage unbalance 39 12 3 Voltage and current Harmonics 40 12 4 Definitions of powers and power factors 43 12 5 Measuring method outlines 46 12 6 Description of typical configurations 47 ...

Страница 4: ...se original HT accessories The following symbols are used in this manual CAUTION observe the instructions given in this manual improper use could damage the instrument its components or create dangerous situations for the operator High voltage danger electrical shock hazard Double insulation AC voltage or current DC voltage or current Connection to earth 1 1 PRELIMINARY INSTRUCTIONS This instrumen...

Страница 5: ...asurement control and laboratory use Part 1 General requirements defines what measurement category commonly called overvoltage category is 6 7 4 Measured circuits reads circuits are divided into the following measurement categories Measurement Category IV is for measurements performed at the source of a low voltage installation Examples are electricity meters and measurements on primary overcurren...

Страница 6: ...ck and intuitive use The instrument can perform the following tests PQA Real time measurement and recording of mains parameters harmonic analysis voltage anomalies sags swells power energy consumption in single phase and three phase generic systems AUX Measurement and recording of environmental parameters illuminance air temperature humidity by means of optional external probes and DC voltage sign...

Страница 7: ...e instrument The green symbol indicates a sufficient charge level for the correct performance of the tests The red symbol indicates an insufficient charge level for the correct performance of the tests In this case recharge the batteries see 9 2 CAUTION If the external adapter is used it is necessary to connect it first to the instrument then to the mains then please connect the instrument to the ...

Страница 8: ... 8 HELP key 9 SAVE key 10 ON OFF key Fig 1 Description of the front part of the instrument CAPTION 1 B1 B2 B3 B4 inputs 2 I1 I2 I3 I4 inputs Fig 2 Description of the upper part of the instrument CAPTION 1 Connector for external adapter 2 Connector for optical USB cable Fig 3 Description of the instrument s side 4 2 DESCRIPTION OF MEASURING LEADS CAPTION 1 Hand protection 2 Safe area Fig 4 Descript...

Страница 9: ...ion keys corresponding to the activation of the four icons on the bottom of the screen as an alternative to direct touch on the display 4 4 DISPLAY DESCRIPTION The display is an LCD 320x240pxl TFT color display with capacitive touch screen whose icon structure can be directly selected with a simple touch The first line of the display indicates the type of active measurement the date time and the b...

Страница 10: ... display AutoPower OFF and of key sound Settings will be maintained also after switching off the instrument 5 1 1 Language Touch the icon to select the system language The screen to the side appears on the display Select the desired language confirm the choice and return to the previous screen 5 1 2 Automatic Power OFF for display and key sound Touch the icon The screen to the side appears on the ...

Страница 11: ...ch the EU icon for the European date time system in the format DD MM YY hh mm or the US icon for the American system in the format MM DD YY hh mm AM PM Touch the up down arrow keys to set the desired value Confirm the settings or exit without saving Current date time is kept inside the instrument without batteries for approximately 12 hours 5 2 INFORMATION Touch the icon The display shows the scre...

Страница 12: ...hree phase systems Fig 7 Direct measurement of leakage current in three phase systems 1 Touch the icon The screen to the side appears on the display Touch the icon to set the full scale of the used clamp The following screen appears on the display 2 Touch the arrow keys or to set the full scale value of the selected HT96U clamp in the 1A 3000A range Press and hold the keys for a quick selection of...

Страница 13: ...P key Automatic stop of recording at the date time set by the user Touch the corresponding field to set the date time in the MM DD YY HH MM format and confirm 4 Insert the external clamp into instrument input I1 5 For indirect measurements of leakage current connect the external clamp according to Fig 6 For direct measurements of leakage current connect the clamp according to Fig 7 and disconnect ...

Страница 14: ...t on going recording The following screen appears on the display 9 The screen contains The number of recording The date time of recording start if automatic The date time of recording stop if automatic The aggregation time set The number of aggregation intervals recorded The residual memory capacity expressed in DD HH MM 10 Press GO STOP key to stop recording the instrument automatically saves the...

Страница 15: ...ve humidity by means of humidity transducer mV input DC voltage without applying any transduction constant Fig 8 Measurement of environmental parameters through external probes 1 Touch the icon The screen to the side appears on the display Touch the icon to set the type of measurement The following screen appears on the display 2 Move the slide bar reference to select the type of measurement among...

Страница 16: ...rument in stand by mode Touch the corresponding field to set the date time in the MM DD YY HH MM format and confirm Move the right slide bar cursor STOP symbol in the positions Manual stop of recording by pressing the GO STOP key Automatic stop of recording at the date time set by the user Touch the corresponding field to set the date time in the MM DD YY HH MM format and confirm 4 Insert in the a...

Страница 17: ...ut on going recording The following screen appears on the display 8 The screen contains The number of recording The date time of recording start if automatic The date time of recording stop if automatic The aggregation time set The number of aggregation intervals recorded The residual memory capacity expressed in DD HH MM 9 Press GO STOP key to stop recording the instrument automatically saves the...

Страница 18: ... CAUTION The instrument can be used for measurements on installations with overvoltage category CAT IV 300V to earth and max 600V between inputs Do not connect the instrument on installations with voltage exceeding the limits indicated in this manual Exceeding these limits could cause electrical shock to the user and damage to the instrument Always connect the measuring cables to the instrument an...

Страница 19: ...VEGA74 EN 18 Fig 9 Connection for measurement on single phase 1 2WIRES Fig 10 Connection for measurement on Three phase system 3 4WIRES Fig 11 Connection for measurement on Three phase system 3 3WIRES ...

Страница 20: ...19 Fig 12 Connection for measurement on Three phase system 3 ARON Fig 13 Connection for measurement on Three phase system 4 wires 3 High Leg Fig 14 Connection for measurement on Three phase system 3 wires 3 Open ...

Страница 21: ...Fig 15 Connection for measurement on Two phase system 3 wires 3 Y Open Fig 16 Connection for measurement on Two phase system 3 wires 3 2El Fig 17 Connection for measurement on Two phase system 3 wires 1 CentrePoint ...

Страница 22: ...e display Touch the or icon keys in order to set the nominal value V of the phase neutral voltage single phase or three phase 4 wire systems for the detection of voltage anomalies sags swells within the range 12V 600V Press and hold the keys for a quick selection of value Touch the or icon keys in order to set the percentage of positive sags detection and negative swell detection thresholds with r...

Страница 23: ...wn 4 Move the left slide bar cursor in order to select the aggregation time see 12 5 among the options 2s 5s 10s 30s 1min 2min 5min 10min 15min 30min Move the central slide bar cursor GO symbol to the positions Manual start of recording by pressing the GO STOP key at the next minute after the pressure of key Automatic start of recording at the date time set by the user after a preliminary pressure...

Страница 24: ...nts depending on the selected connection type Insert the remaining free end of the cables into the corresponding crocodiles or tips Connect crocodiles or test leads to phase L1 L2 L3 and N according to the images in 6 3 1 Connect the clamps to I1 I2 I3 and I4 inputs and to the phase conductors according to the images in 6 3 1 The arrow on the clamp must point in the direction in which the current ...

Страница 25: ...reen like the one to the side shows the real time values of phase angles between voltage and current relevant to a three phase system The parameters are indicated with small squares in different colors and the angular values are shown on the right side The positive rotation reference associated with each vector diagram is clockwise In the bottom part of the display there are the Rev and Zero indic...

Страница 26: ... shown on the display A blue frame automatically shows the harmonic with the highest amplitude except for the fundamental The numeric value of harmonic amplitude identified by hxx and the THD value see are shown on the right side Touch the or arrow icons to increase or decrease the harmonic order Press the SAVE button or touch the icon to save the measurement on the display as instantaneous snapsh...

Страница 27: ...llowing items are included The icon which indicates the consumption of power energy absorbed by the load The value of absorbed energy while recording The peak of power absorbed while recording The date time of the above mentioned peak of power The number of recordings to which the above results are referred 18 Touch the icon in order to select the display of generated power energy measured by the ...

Страница 28: ... error Check the PC connection Battery low Replace or recharge batteries Internal error Contact service department Resistance High temperature Switch off and let cool the instrument MOS High temperature Switch off and let cool the instrument Resistance Low temperature Contact service department Test time too long Switch off and on the instrument and repeat the test IGBT damaged Contact service dep...

Страница 29: ... to save its result The screen to the side appears on the display The meaning of the icons is the following It expands hides the selected node It allows the choice of a 1st level node It inserts a nested sub node max 3 levels It adds a user comment on the performed measurement 2 Press the or key to insert a main marker or a sub marker The screen to the side is shown by the instrument Touch one of ...

Страница 30: ...board Touch the icon to go back to the previous screen 3 Touch the icon to recall the results of saved recordings see 7 1 3 Touch the icon to delete the last saved result in the instrument memory The following screen appears on the display Touch the icon to confirm the operation or the icon to return to the previous screen 4 Touch the icon to delete all the results stored in the memory of the inst...

Страница 31: ...e desired recording indicated as REC_xxx and touch the to recall at display The followed screen is shown 2 In the screen is shown The recording number The date time of start recording if automatic The date time of stop recording if automatic The aggregation time set The number of aggregation intervals recorded The residual memory capacity expressed in DD HH MM The number of detected voltage anomal...

Страница 32: ...n to the side and blocks the operation 3 In case tries to create a sub node by using a just used name the instrument provides the warning screen shown to the side and is necessary to define a new name 4 In case tries to define a numebr of nodes of 1st 2nd and 3rd level higher than 250 for each level the instrument provides the warning screen shown to the side 5 In case tries to include a comment o...

Страница 33: ... Use the management software to download the instrument memory contents to a PC Please refer to the online help of the program itself for any detail regarding the operation 5 Touch the icon to go back to the general menu of the instrument Connecting to a PC through WiFi 1 Put the instrument in data transfer mode to a PC see 8 point 3 Enable the WiFi connection touch the icon in the top right side ...

Страница 34: ...kaline not rechargeable batteries 1 Switch off the instrument by pressing the ON OFF key 2 Remove the cables from the input leads 3 Loosen the battery compartment cover fastening screw and remove the cover 4 Remove all the batteries if not rechargeable from the battery compartment and replace them with new batteries of the right type only 10 4 making sure to respect the indicated polarities To rec...

Страница 35: ...clamp FS AC Clamp A Resolution A Accuracy 1 0 1mA 1 rdg 20dgt 1 FS 10 0 01A 10 FS 100 0 1A 100 FS 1000 1A Environmental parameters Measurement Range Resolution Accuracy C 20 0 60 0 C 0 1 C 2 rdg 2digits F 4 0 140 0 F 0 1 F RH 0 0 100 0 RH 0 1 RH DC voltage 0 1mV 1 0V 0 1mV Lux 0 001 20 00lux 0 001 0 02Lux 0 1 2 0klux 0 1 2Lux 1 20 0klux 1 20Lux Accuracy of the luxmetric probe according to Class AA...

Страница 36: ... factor 2 4 Frequency 42 69 0 Hz AC TRMS Current FLEX Clamp 300A AC range Range mV Frequency Hz Resolution Accuracy Overload protection 0 085 85 0 42 65 0 8 5 V 0 5 rdg 0 17 FS 10V Crest factor 3 Allowed current 1A are zeroed AC TRMS Current FLEX Clamp 3000A AC range Range mV Frequency Hz Resolution Accuracy Overload protection 0 425 255 0 42 65 0 85 V 0 5 lettura 0 17 FS 10V Crest factor 3 Allowe...

Страница 37: ...ue 0 5 fundamental value or DC value 1 0V 1 Harmonic value of 1 Harmonic 15V 2nd 49th Harmonics harmonic value 0 5 fundamental value or if value 1 0V Current harmonics Range Resolution Order Accuracy 0 1 100 0 0 1 DC 01 49 5 0 rdg 5rdg Fundamental frequency 42 69 0 Hz Harmonics are zeroed at the below conditions DC DC value 0 5 fundamental value or DC value 0 5 FS clamp 1 Harmonic value of 1 Harmo...

Страница 38: ...n recording Recharging time approx 12 hours External adapter 100 240VAC 50 60Hz 15VDC CAT IV 300V Auto Power OFF after 5 minutes idling if activated Miscellaneous Display TFT color capacitive touch screen 320x240mm Aggregation time 2s to 30min selectable Memory for snapshots 999 memory locations 3 levels of markers Memory for recordings 8MB not expandible max 49 recordings Connection to PC optical...

Страница 39: ...equence of improper packaging Repairs which may become necessary as a consequence of interventions performed by unauthorized personnel Modifications to the instrument performed without the manufacturer s explicit authorization Use not provided for in the instruments specifications or in the instruction manual The content of this manual cannot be reproduced in any form without the manufacturer s au...

Страница 40: ...tions Moreover in single phase systems the balance can be only statistic In order to design a correct protection installation a thorough study of anomalous conditions on three phase systems was performed To better understand the meaning of an installation s parameter the theory of symmetric components is fundamental From the theory is always true that any tern of vectors can be decomposed in three...

Страница 41: ...he index of the sigma is from 1 to the infinite What happens in reality is that a signal does not have an unlimited number of harmonics a number always exists after which the harmonics value is negligible The EN 50160 standard recommends to stop the index in the expression 1 in correspondence of the 40 th harmonic A fundamental element to detect the presence of harmonics is THD defined as 1 40 2 2...

Страница 42: ...ndary transformers The secondary generally provides 230V AC from phase to neutral and 400V AC from phase to phase Balancing the loads on each phase has always represented an headache for electric systems designers Until some ten years ago in a balanced system the vectorial sum of the currents in the neutral was zero or quite low given the difficulty of obtaining a perfect balance The devices were ...

Страница 43: ...ng at its rated capacity when not suited to the harmonics This is necessary because the harmonic current in the neutral wire of the secondary circuit circulates in the delta connected primary circuit This circulating harmonic current heats up the transformer Phase harmonic currents are reflected on the primary circuit and continue back to the power source This can cause distortion of the voltage w...

Страница 44: ...n phase In the presence of distorted voltages and currents the previous relations vary as follows Phase Active Power n 1 2 3 I V P n k n k n k k actn cos 0 Phase Apparent Power n 1 2 3 n nN appn I V P Phase Reactive Power n 1 2 3 2 2 actn appn reactn P P P Phase Power Factor n 1 2 3 appn actn n F P P P Distorted Power Factor n 1 2 3 dPFn cosf1n phase displacement between the fundamentals of voltag...

Страница 45: ...eliminated from the electric installation Conventions on powers and power factors As for the recognition of the type of reactive power of the type of power factor and of the direction of the active power the below conventions must be applied The stated angles are those of phase displacement of the current compared to the voltage for example in the first panel the current is in advance from 0 to 90...

Страница 46: ...e panel and therefore acquires a null value 1 The power factor inductive or capacitive positive or negative is NOT defined in the panel Three phase 3 wire ARON system In the electrical systems distributed without neutral the phase voltages and the power factors and phase cos lose importance Only the phase to phase voltages the phase currents and the total powers remain defined Phase 1 Phase 2 Phas...

Страница 47: ...formation to be saved providing significant data The selected method is the integration one after a certain period called aggregation time which can be set from 2 seconds to 30 minutes the meter extracts from the sampled values the following values MINIMUM value of the parameter during the aggregation time harmonics excluded AVERAGE value of the parameter intended as arithmetic average of all the ...

Страница 48: ...etting default configuration all possible recording parameters The parameters selected for recording in each of the typical configurations depending on the type of selected electric system are listed below Three phase system 3 4WIRES 3 3WIRES and Single phase 1 2WIRES EN50160 Description Settings System type Not modified Frequency Not modified Clamp type Not modified Full scale clamp Not modified ...

Страница 49: ...t modified High threshold limit for voltage anomalies Not modified Low threshold limit for voltage anomalies Not modified Harmonic s recording Selected Selected voltage V1 Single V12 V32 V31 3 wires V1 V2 V3 4 wires Voltage harmonics THD DC 01 02 49 Voltage unbalance Not selected Voltage frequency Selected Selected current I1 Single I1 I2 I3 3 wires I1 I2 I3 In 4 wires Current harmonics THD DC 01 ...

Страница 50: ...Not selected Selected current I1 Single I1 I2 I3 3 wires I1 I2 I3 In 4 wires Selected powers P1 P1 Q1i Q1i Q1c Q1c S1 S1 Single Pt Pt P1 P1 P2 P2 P3 P3 Qti Qti Qtc Qtc Q1i Q1i Q1c Q1c Q2i Q2i Q2c Q2c Q3i Q3i Q3c Q3c St St S1 S1 S2 S2 S3 S3 3 wire 4 wires Selected energies Ea1 Ea1 Er1i Er1i Er1c Er1c Es1 Es1 Single Eat Eat Ea1 Ea1 Ea2 Ea2 Ea3 Ea3 Erti Erti Ertc Ertc Er1i Er1i Er1c Er1c Er2i Er2i Er...

Страница 51: ...quency Selected Selected current I1 Single I1 I2 I3 3 wires I1 I2 I3 In 4 wires Current harmonics THD DC 01 02 49 Selected powers P1 P1 Q1i Q1i Q1c Q1c S1 S1 Single Pt Pt P1 P1 P2 P2 P3 P3 Qti Qti Qtc Qtc Q1i Q1i Q1c Q1c Q2i Q2i Q2c Q2c Q3i Q3i Q3c Q3c St St S1 S1 S2 S2 S3 S3 3 wire 4 wires Selected energies Ea1 Ea1 Er1i Er1i Er1c Er1c Es1 Es1 Single Eat Eat Ea1 Ea1 Ea2 Ea2 Ea3 Ea3 Erti Erti Ertc ...

Страница 52: ... Selected powers Not selected Table 6 List of standard parameters saved in a EN50160 typical configuration HARM Description Settings System type Not modified Frequency Not modified Clamp type Not modified Full scale clamp Not modified TV ratio Not modified Start recording Not modified Stop recording Not modified Aggregation time 10min Voltage anomalies recording Selected Reference voltage anomalie...

Страница 53: ...ti dPfti dPftc dPftc Table 8 List of parameters saved in POWER ENERGY typical configuration DEFAULT Description Description System type Not modified Frequency Not modified Clamp type Not modified Full scale clamp Not modified TV ratio Not modified Start recording Not modified Stop recording Not modified Aggregation time Not modified Voltage anomalies recording Selected Reference voltage anomalies ...

Страница 54: ...t selected Selected powers Not selected Table 10 List of standard parameters saved in a EN50160 typical configuration HARM Description Description System type Not modified Frequency Not modified Clamp type Not modified Full scale clamp Not modified TV ratio Not modified Start recording Not modified Stop recording Not modified Aggregation time 10min Voltage anomalies recording Selected Reference vo...

Страница 55: ...oltage anomalies Not modified Harmonic recording Not selected Selected voltage V1 V2 V12 Voltage frequency Selected Voltage unbalance Not selected Selected current I1 I2 In Selected powers Pt Pt Qti Qti Qtc Qtc St St P1 P1 Q1i Q1i Q1c Q1c S1 S1 P2 P2 Q2i Q2i Q2c Q2c S2 S2 Selected energies Eat Eat Erti Erti Ertc Ertc Ea1 Ea1 Er1i Er1i Er1c Er1c Es1 Es1 Ea2 Ea2 Er2i Er2i Er2c Er2c Es2 Es2 Selected ...

Страница 56: ...ic recording Selected Selected voltage V1 V2 V12 Voltage harmonics THD DC 01 02 49 Voltage unbalance Not selected Voltage frequency Selected Selected current I1 I2 In Current harmonics THD DC 01 02 49 Selected powers Pt Pt Qti Qti Qtc Qtc St St P1 P1 Q1i Q1i Q1c Q1c S1 S1 P2 P2 Q2i Q2i Q2c Q2c S2 S2 Selected energies Eat Eat Erti Erti Ertc Ertc Ea1 Ea1 Er1i Er1i Er1c Er1c Es1 Es1 Ea2 Ea2 Er2i Er2i...

Страница 57: ...ergie power factors Not selected Table 14 List of standard parameters saved in a EN50160 typical configuration HARM Description Description System type Not modified Frequency Not modified Clamp type Not modified Full scale clamp Not modified TV ratio Not modified Start recording Not modified Stop recording Not modified Aggregation time 10min Voltage anomalies recording Selected Reference voltage a...

Страница 58: ... Harmonic recording Not selected Selected voltage V12 V23 V31 Voltage frequency Selected Voltage unbalance Not selected Selected current I1 I2 I3 Selected powers Pt Pt Qti Qti Qtc Qtc St St P12 P12 Q12i Q12i Q12c Q12c S12 S12 P32 P32 Q32i Q32i Q32c Q32c S32 S32 Selected energies Eat Eat Ea12 Ea12 Ea32 Ea32 Erti Erti Ertc Ertc Er12i Er12i Er12c Er12c Er32i Er32i Er32c Er32c Est Est Es12 Es12 Es32 E...

Страница 59: ...ione selezionata V12 V23 V31 Voltage harmonics THD DC 01 02 49 Voltage unbalance Rev Voltage frequency Selected Selected current I1 I2 I3 Current harmonics THD DC 01 02 49 Selected powers Pt Pt Qti Qti Qtc Qtc St St P12 P12 Q12i Q12i Q12c Q12c S12 S12 P32 P32 Q32i Q32i Q32c Q32c S32 S32 Selected energies Eat Eat Ea12 Ea12 Ea32 Ea32 Erti Erti Ertc Ertc Er12i Er12i Er12c Er12c Er32i Er32i Er32c Er32...

Страница 60: ...9 3367 8775 Fax 55 19 9979 11325 eMail vendas ht instruments com br Web www ht instruments com br HT INSTRUMENTS USA LLC 3145 Bordentown Avenue W3 08859 Parlin NJ USA Tel 1 719 421 9323 eMail sales ht instruments us Web www ht instruments com HT INSTRUMENTS GMBH Am Waldfriedhof 1b D 41352 Korschenbroich GER Tel 49 0 2161 564 581 Fax 49 0 2161 564 583 eMail info ht instruments de Web www ht instrum...

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