Delta OHM DO 9709 Instruction Manual
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Delta OHM DO 9709 Instruction Manual

Delta OHM DO 9709 Instruction Manual

Dissolved oxygen data logger
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DO 9709
INSTRUCTIONS MANUAL

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Summary of Contents for Delta OHM DO 9709

  • Page 1 DO 9709 INSTRUCTIONS MANUAL...
  • Page 2 DO 9709...
  • Page 3 DO 9709 DO 9709 DISSOLVED OXYGEN - DATA LOGGER...
  • Page 4 ENGLISH 1 Input A: probe for measuring dissolved oxygen. 2 Double LCD display. 3 The symbol indicates that the HOLD key has been pressed. symbol. If permanently lit, the battery is flat. If flashing at 1 Hz, the Auto Power Off function is disabled.
  • Page 5 ENGLISH INTRODUCTION The DO 9709 Dissolved Oxygen - Data Logger allows the measurement of the concentration (expressed in mg/l) of dissolved oxygen in liquids and of the saturation index (expressed in %), using a combined measurement probe of a polarographic type with two or three electrodes, and a temperature sensor inside the probe.

  • Page 6: Reference Standard

    ENGLISH REFERENCE STANDARD In designing the instrument, the reference taken for measuring Oxygen dissolved in water, using an electrochemical probe method, was standard UNI EN 25814 (Water quality. Determination of dis- solved oxygen. Electrochemical probe method). The German standard DIN 30408 part 23 was also considered (German standard methods for the examination of water, waste water and sludge.
  • Page 7 ENGLISH FUNCTION OF THE SYMBOLS ON THE KEYBOARD SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION ON/OFF All the symbols are lit for a few ON/OFF key. Press this key seconds after pressing the repeatedly to switch the instru- ON/OFF key. ment on or off.

  • Page 8: Function Description

    ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION The REL key allows you to mg/l display or store relative values or send them immediately onto the serial line. The values for comparison are °C stored at the precise moment in which the key is pressed.
  • Page 9 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION PROG Programming of the instrument is activated by pressing the PROG key. The message P0 appears at the top of the display indicating that the parameter P0 is being pro- grammed. By continuing to press the PROG key the messages P1, P2, P3, P4, P5, P6, P7, P8, P9, P10, P11, P12, P0, etc.
  • Page 10 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION - P1 - = data dump When ENTER is pressed with P1 on the display, the data stored in the memory of the instrument are unloaded (DUMP); press the PROG key to move on to step P2. During the data dump, the messa- ge dUP appears on the upper display of the instrument and the...
  • Page 11 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION interruption of storage ends and determines the block. When the key (MEMORY = erase memory CLEAR sub-function) is pressed with P1 on the display, all the sto- red data are erased. After they have been erased, the instrument will display the messa- ge CLr and the number of memory units erased.

  • Page 12: Recording Interval

    ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION At top left of the display the instru- ment indicates the hours (1 - 12). After defining the storage time, press ENTER to return to normal operation, or press the PROG key to move on to step P3.
  • Page 13 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION - P3 - = set Baud Rate When ENTER is pressed with P3 on the display, the Baud Rate of the RS 232C serial transmission may be modified. keys are used to select the desired value.
  • Page 14 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION - P5 - = set month When ENTER is pressed with P5 on the display, the month may be set or changed. keys are used to select the desired month. Then press PROG to move on to step P6 (the ENTER key is not active).
  • Page 15 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION - P7 - = set hours When ENTER is pressed with P7 on the display, the hour may be set or changed. keys are used to select the desired hour. Then press PROG to move on to step P8 (the ENTER key is not active).
  • Page 16 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION - P9 - enable/disable When ENTER is pressed with P9 self cut-out on the display, the instrument enters the program which enables or disables the self cut-out func- tion when it is in storage mode and with a set storage interval higher than or equal to 1 minute.
  • Page 17 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION When the ON/OFF key is pressed, storage is interrupted and the instrument switches off. 01 With a set storage interval higher than 1 minute, the display does not switch off automatically; it remains always lit and goes on storing.
  • Page 18 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION pressing the PROG key moves on to step P11. - P11 - calibrate tempe- P11+ Pressing the PROG key moves rature probe on to step P12. When ENTER is pressed with P11 on the display, the instrument enters the program for calibrating the temperature probe.

  • Page 19: Serial Output

    ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION - P12 - calibrate P12+ Pressing the PROG key moves pressure sensor on to step P0. When ENTER is pressed with P12 on the display, the instrument enters the program for calibrating the pressure sensor.
  • Page 20 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION With a data transmission speed of 300 baud (the character being composed of 10 bit: 1 start bit + 8 character bit + 1 stop bit), the time taken to send 80 characters on the serial line is: 80 / (300/10) = 2.7 sec.
  • Page 21 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION When pressed repeatedly, the mg/l with RCD key (RCD sub-function) starts and stops the record function, which calculates and stores the maxi- °C mum, minimum and mean values. When the RCD key is held down the instrument emits a short beep followed by a long one.
  • Page 22 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION up till then, reset the RCD func- tion and restart it. key. During programming or calibration, this key is used to decrease the value of the para- meter being considered. CAL key. If the CAL key is held down for more than 2 seconds, it activates the function for cali- brating the dissolved Oxygen...
  • Page 23 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION mg/l % = Oxygen probe After CAL has been pressed for calibration more than 2 seconds the dissol- ved Oxygen probe may be cali- brated by pressing mg/l %. Immediately after mg/l % has been pressed the display will show a value of 101.7% as the saturation index or the value of...
  • Page 24 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION After CAL has been pressed for , Salinity = more than 2 seconds the salinity setting salinity of the water considered may be set by pressing the (Salinity sub-function). The bottom of the display shows mg/l the currently set salinity in g/l, while the SAL indication flashes.
  • Page 25 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION key (Salinity sub-function). mg/l +Salinity Pressing this key allows you to activate or disactivate compensa- tion of water salinity when measu- °C ring the concentration of dissolved Oxygen. Activation of the SAL signal, when the concentration of dissolved Oxygen is shown in mg/l, indica- tes that the instrument is compen-...
  • Page 26 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION °C/°F °C/°F key. Pressing this key chan- mg/l ges the temperature measuring mg/l unit °C or °F. The key is active in the states RCD, REL, DATA °C CALL and HOLD. °F ENTER key (Start-Stop sub-func- mg/l tion).
  • Page 27 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION time needed for all the acquisition and storage operations. Once this has been done the instrument switches itself off again. During this stage the instrument is apparently switched off, but active indeed in the operative mode. If the Serial Out/Memory symbol lights up when switching on the instrument with the ON/OFF key,...
  • Page 28 ENGLISH SIMBOLS LIT BESIDES FUNCTION THE NUMBERS DESCRIPTION mg/l % mg/l % key. Pressing this key mg/l changes the dissolved Oxygen mg/l measuring unit mg/l % or %. The key is active in the states RCD, °C REL, DATA CALL and HOLD. °F...

  • Page 29: How To Measure

    ENGLISH HOW TO MEASURE 1. Switching on the instrument with the ON/OFF key. * This operation enables the automatic cutout timer. * If you wish power supply without automatic interruption, press the HOLD and ON/OFF keys simultaneously and keep the HOLD button held down for the duration of the switching-on routi- ne.
  • Page 30 ENGLISH sage E04 alternating with the Oxygen measurement: the instrument is not able to calculate the partial pressure of the saturated dissolved Oxygen. 3. Selection of the measuring unit. * Press the mg/l % key repeatedly to show, at the top of the display, the measurement of the concentration of dissolved Oxygen expressed in mg/l or the saturation index expressed in %.
  • Page 31 ENGLISH Serial Output, storage in the internal memory, unloading of stored data, erasing of the internal memory, setting of the working parameters, enabling compensation of the salinity of liquids, setting the default salinity and temperature, see the description of the instrument keyboard. Attention when using the keyboard.

  • Page 32: Temperature Measurement

    ENGLISH After having replaced the electrolyte and the membrane, if the membrane has been allowed to dry, wet it and wait for the reading to stabilise before calibrating it. The waiting time is the time neces- sary to use up the dissolved oxygen in the electrolyte. In the case of specimens in a container, take the measurement with the container filled up to over- flowing, using an agitator, for example a magnetic bar.
  • Page 33 ENGLISH METHOD OF USING THE INSTRUMENT AND WARNINGS * Probes for measuring dissolved Oxygen may be influenced by the presence of gases and vapours such as chlorine, sulphur dioxide, hydrogen sulphide, amines, ammonia, carbon dioxide, bromine and iodine. These substances may pass through the membrane and interfere with the current measurement.

  • Page 34: Low Battery Warning And Battery Replacement

    ENGLISH INSTRUMENT SIGNALS AND MALFUNCTIONS On the upper or lower display indicates that: * the dissolved Oxygen probe is exceeding the measurement limits; * the temperature exceeds the range 0-50°C and does not allow the measurement of Oxygen; * the pressure measurement is wrong and does not allow the measurement of Oxygen; * the probe is disconnected or broken;...

  • Page 35: Storage Of The Instrument

    ENGLISH Ensure that the instrument is switched off before changing the battery. symbol appears fixed to indicate that the battery is low. This indication prevails over all the other signals which make use of the symbol. In RCD function the symbol flashes at a fre- quency of 2 Hz.

  • Page 36: Serial Interface Rs 232C

    ENGLISH 1. There is a high degree of humidity; 2. The instrument is exposed to direct sunlight; 3. The instrument is exposed to a source of high temperature; 4. There are strong vibrations; 5. There is steam, salt and/or corrosive gas. The instrument body is made of ABS plastic so it must not be cleaned with solvents which can spoil plastic.
  • Page 37 ENGLISH HOST COMMANDS COMMAND REPLY Type of terminal D OXYGEN - DL Firmware Version V. x R. x Firmware Date dd/mm/yy Request Concentration in mg/l Request Saturation index in % Request Temperature in °C or °F Request Pressure in mbar Measurement DISSOLVED OXYGEN Xoff (Ctr-S)
  • Page 38 ENGLISH DO 9709 DIAGRAM Dissolved Oxygen probe Temperature probe PRINTER WITH SERIAL INPUT PRINTER SERIAL/ WITH PARALLEL PARALLEL CONVERTER INPUT...
  • Page 39 ENGLISH EXAMPLE OF A REPORT PRINTED BY THE INSTRUMENT DISSOLVED OXYGEN - Data Logger Immediate serial report DATE TIME --------- O2 ---------- ---- T --- ---- P --- 09-06-98 16:47:59 6.47 mg/l 57.3% 9.9°C 1012 mbar 09-06-98 16:48:00 6.47 mg/l 57.2% 9.8°C 1012 mbar 09-06-98 16:48:01...
  • Page 40 ENGLISH DISSOLVED OXYGEN - Data Logger Remote memory report DATE TIME --------- O2 ---------- ---- T --- ---- P --- 09-06-98 16:49:43 5.03 mg/l 57.3% 9.9°C 1012 mbar 09-06-98 16:49:44 5.03 mg/l 57.3% 9.9°C 1012 mbar 09-06-98 16:49:45 5.03 mg/l 57.2% 9.9°C 1012 mbar 09-06-98 16:49:46...
  • Page 41 2. Connect the serial gate of the measuring instrument to a free serial gate on the PC (COM1/COM2) using the special DELTA OHM CP RS 232C cable. Note: the CP RS 232C cable ends in a female 25-pin connector; if your PC does not have a compatible connector, use the adapters normally found on the market to make the con- nection.
  • Page 42 ENGLISH D) To alter the communication settings of the terminal, in order to make them compatible with those of the measuring instrument used (unless a terminal setting file has already been saved): select SETTINGS in the terminal window (one click) select COMMUNICATIONS from the menu (one click) the COMMUNICATIONS window for setting the communication procedures will appear on the screen;...
  • Page 43 ENGLISH E) To set the correct character type: select SETTINGS from the terminal window (one click) on the pull-down menu select TERMINAL PREFERENCES... (one click) the TERMINAL PREFERENCES window appears on the monitor, set: mark local Echo (one click) Character type: Terminal (or equivalent) leave the rest unchanged OK to confirm the setting (one click)
  • Page 44 ENGLISH F) If you want to save this terminal setting: select FILE from the terminal window (one click) select SAVE AS from the pull-down menu and the SAVE FILE AS window will appear (one click) type the name of the terminal setting file (max. 8 characters) on the line provided OK to confirm and save the setting (one click)
  • Page 45 ENGLISH G) To receive and store data from an instrument: select TRANSFER from the terminal window (one click) select RECEIVE TEXT FILE from the pull-down menu and the window will appear (one click) type the name of the file in which data are to be stored (max. 8 characters) on the line provided OK to confirm and start storage (one click) At this point the terminal is ready to receive data from the measuring instrument.
  • Page 46 ENGLISH H) Switch on the measuring instrument When the instrument has completed the switching-on routine, activate the immediate unloading of data at the set rate, pressing the Serial Output button, or activate the unloading of the data stored in the internal memory with the program P1 (press the PROG button twice) and press the ENTER button.
  • Page 47 ENGLISH Software connection with WINDOWS 95. A) After starting WINDOWS 95, select START, PROGRAMS, ACCESSORIES, HYPERTERMINAL. Run HYPERTRM (double click). B) Name of the communication. In the window "Description of connection", give a name to the communication that you want to activate and choose an icon (in subsequent communications it will be possible to activate direc- tly the icon chosen in place of HYPERTRM, automatically recovering all the settings saved with the icon).
  • Page 48 ENGLISH C) Setting communication - select FILE from the Hyper Terminal window (one click) - select PROPERTIES from the pull-down menu (one click) and the "Properties" window will appear - on the "telephone number" card, for the Connect property, choose "directly to COM1" or COM2, depending on the serial gate that you intend to use for communication with the measu- ring instrument - on the "telephone number"...
  • Page 49 ENGLISH...
  • Page 50 ENGLISH - select SETTINGS to display the "Settings" card - on the "Settings" card, for the "Emulation" property, select: TTY - OK to confirm the "Properties" set (one click)
  • Page 51 ENGLISH D) To set the correct character type: - select DISPLAY from the Hyper Terminal window (one click) - select CHARACTER from the pull-down menu (one click) and the window for selecting the cha- racter will appear; set: - Terminal (or equivalent) - OK to confirm (one click)
  • Page 52 ENGLISH E) To receive and store data from an instrument: - select CALL from the Hyper Terminal window (one click) - select CONNECT from the pull-down menu In this way it is possible to receive the characters from the instrument on the monitor...
  • Page 53 ENGLISH F) To receive and store data from an instrument: - select TRANSFER from the Hyper Terminal window (one click) - select CAPTURE TEXT from the menu (one click) and the window will appear where you have to set the name of the file in which to store the data received from instrument - type the name of the file in which data are to be stored on the line provided - OK to set the name of the receiving file (one click) At this point the Hyper Terminal software is able to receive data from the measuring instrument and...
  • Page 54 ENGLISH G) To end receiving data from an instrument: select TRANSFER from the Hyper Terminal window (one click) select CAPTURE TEXT from the menu (one click) select END from the pull-down sub-menu (one click) At this point data reception from the instrument is ended and the file stored in the computer can be used with any of the software packages used with WINDOWS 95.
  • Page 55 ENGLISH INSTRUCTIONS FOR MAINTENANCE AND CALIBRATION OF THE DIS- SOLVED OXYGEN PROBE As has already been said, with the use the probe for measuring dissolved Oxygen is bound to run down, in fact the chemical reaction which generates the current proportional to the partial pressure of the oxygen in the water leads to the exhaustion of the electrolyte in the probe.
  • Page 56 4. The instrument must indicate a saturation index of less than 0.3%. Calibrating the probe. 1. Wet the sponge contained in the calibrator DO 9709/20 with 2 ml of distilled water; 2. insert the probe in the calibrator; 3. wait a few minutes until the system has become thermally stable;...
  • Page 57 ENGLISH INSTRUCTIONS FOR TEMPERATURE CALIBRATION OF THE INSTRUMENT Temperature calibration of the instrument may be carried out either with an external simulator or with a specific probe to be coupled to the instrument and a calibration oven. Calibration may be performed independently on the input A, on the input B for TP 870 probes and on the input B for 4-wire Pt100 probes.
  • Page 58 ENGLISH After having connected the coupling probe to the instrument, select program P11 by pressing the PROG key repeatedly. With P11 on the display, press the ENTER key. The top of the display will show the message CAL, while the bottom of the display will show the measured temperature. First calibration point 0.0°C (or 32.0°F).
  • Page 59 Dissolved Oxygen probe connection diagram. The dissolved Oxygen probe of the instrument DO 9709 is to be connected to the input A. Such probe is fitted with a DIN 41524 8-pole male connector.
  • Page 60 ENGLISH If a temperature probe is connected to input B, the instrument will use the temperature value measured at input B for the dissolved Oxygen calculations and not the temperature measu- red by the sensor inside the Oxygen probe. The user must consider this carefully so as not to make incorrect measurements.
  • Page 61 ENGLISH be it is possible to calculate also the partial pressure of the Oxygen in saturation, the saturated con- centration of Oxygen, the compensation of water salinity, the compensation of the membrane per- meability, allowing the calculation of the saturation index and of the concentration of Oxygen in the liquid.
  • Page 62 ENGLISH The table shows the saturated concentration of Oxygen dissolved in pure water as a function of temperature, according to standard DIN 30408 part 23. The standard UNI EN 25814 supplies the same concentration values for temperatures from 0 to 30°C. SATURED CONCENTRATION OF OXYGEN cs (mg/l) Temperature (°C) 14.62...
  • Page 63 ENGLISH The presence of salt dissolved in water leads to a decrease of the saturated concentration of dis- solved Oxygen in mg/l, the saturation index remains unchanged. The standard UNI EN 25814 sup- plies the correction to be made to the saturated concentration of dissolved Oxygen, by degree of salinity, depending on the temperature.
  • Page 64 ENGLISH CONNECTION OF THE TEMPERATURE PROBES At input B of the instrument DO 9709 a temperature probe of the series TP 870 may be connected, or a 4-wire probe with a Pt100 sensor. These probes have a DIN41524 8-pole male connector.
  • Page 65 ENGLISH Tolerances of Platinum temperature detectors according to IEC 751 (1983), BS 1904 (1984) and DIN 43760 (1980) Temp °C Tolerance Tolerance CLASS B CLASS A 1/3 DIN 1/5 DIN 1/10 DIN +/– +/– +/– +/– +/– +/– +/– +/– +/–...
  • Page 66 ENGLISH Table of resistances of platinum sensors with regard to temperature (ITS 90). Industrial Platinum Resistance Thermometer Sensor - R(0) = 100.00Ω...
  • Page 67 ENGLISH...
  • Page 68 HD 8804 ∅ 4 HD 8901 HD 9117 TP 870P 3" +400 HD 9021 DO 9406 DO 9505 DO 9417 DO 9704 DO 9709 ∅ 4 TP 870A 12" +300 ∅ 15 ∅ 12 ∅ 3 3" TP 871 +200...
  • Page 69 ENGLISH TECHNICAL CHARACTERISTICS DO 9709 * Display: double LCD 3 digit, figure height 12.5 mm. and symbols. * Instrument conversion frequency: 2 per second. * Instrument working temperature: -5°C...+50°C, 0...90% R.H., no condensation. * Storage temperature: -20°C...+60°C. * Power supply: 9V battery, lifetime with a good alkaline battery 100 hours (about 1 year with the instrument switched off).
  • Page 70 ENGLISH Measurement of atmospheric pressure Measuring range: 600 to 1100 mbar Resolution: 1 mbar Accuracy of instrument alone: ±2 mbar in the range 18 to 25°C ±2 mbar +0.1 mbar/°C in the range -5 to 18°C and 25 to 50°C Setting water salinity Setting range: 0.0 to 70.0 g/l...

  • Page 71: Order Code

    DO 9709: Diplomatic carrying case, instrument DO 9709, manual, 9V alkaline battery, tempe- rature probe TP 870, connecting cable CP RS 232C, calibrator DO 9709/20, solu- tion DO 9700 and solution DO 9701. The probe for measuring dissolved Oxygen must be ordered separately.
  • Page 72 ENGLISH EXAMPLES OF USE OF THE KEYBOARD Switches the instrument on or off. Blocks or releases updating of the display. mg/l mg/l HOLD °C °C Display blocked Display reset Allows the display, storage or sending of the relative values immediately onto the serial line.
  • Page 73 ENGLISH Pressing DATA CALL repeatedly gives: mg/l The Maximum value of the pro- °C bes connected to the inputs mg/l The Minimum value of the probes °C connected to the inputs mg/l The Mean value of the probes °C connected to the inputs mg/l Returns to normal operating °C...
  • Page 74 ENGLISH Instrument programming. mg/l Returns to normal ope- rating mode, without °C storing the changed values Unloads data from the memory Returns to normal operating mode Erases memory (Memory Clear) Returns to normal operating mode Confirms the selected value and returns to normal operating mode...
  • Page 75 ENGLISH Sets month 01, 02, 03 ... 12 Example 01 January Sets day 01, 02, 03 ... 31 Example 01 Sets hour 01, 02, 03 ... 23 Example 00 midnight Confirms the selected value and returns to nor- mal operating mode, storing the set date and time.
  • Page 76 ENGLISH Confirms the selected value and returns to normal operating mode Enables self cut-out during storage with an intervention time equal to or greater than 1 minute The instrument does not cut out automatically during storage Confirms the selected value and returns to normal operating mode The instrument uses a probe of the type...
  • Page 77 ENGLISH Enters calibration of the °C pressure value °F Returns to parameter P0 Activation or disactivation of the serial output. mg/l mg/l °C °C Serial Memory Serial output active Serial output ended Activation or disactivation of the Record function. mg/l °C When the key is pressed the instrument gives a beep and starts storing and updating...
  • Page 78 ENGLISH Activates modification of the default temperature, modification of salinity and calibra- tion of the electrode. mg/l mg/l Confirm °C °C temperature for 2 Sets default seconds temperature mg/l mg/l Confirm °C salinity for 2 Salinity seconds Sets salinity mg/l Performs automatic calibration and returns °C to normal operating mode...
  • Page 79 ENGLISH Activation or disactivation of storage. mg/l mg/l Start-Stop °C °C Start-Stop Start-Stop Serial Memory Storage phase active Storage phase ended Changes the dissolved Oxygen measurement unit mg/l °C °C Shows dissolved Oxygen Shows dissolved Oxygen in concentration mg/l in saturation index %...
  • Page 80 DO 9709 DIAGRAM ........
  • Page 81 TECHNICAL CHARACTERISTICS DO 9709 ........
  • Page 82 Voltage variations EN61000-4-11 Electromagnetic interference IEC1000-4-3 sucseptibility Electromagnetic interference EN55020 class B emission DELTA OHM SRL - VIA G. MARCONI, 5 35030 CASELLE DI SELVAZZANO (PD) - ITALY TEL. 0039-0498977150 r.a. - FAX 0039-049635596 e-mail: deltaohm@tin.it - Web Site: www.deltaohm.com...

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