Delta DO 9704 manual Introduction

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ENGLISH

INTRODUCTION

The DELTA OHM DO 9704 pressure gauge and data logger has been designed for detecting pres- sure, flow rate and temperature, physical values which are very important in industrial and chemical processes.

The instrument has two inputs, A and B, and automatically recognises the probes connected, whether they be pressure or temperature probes or turbines for measuring flow rate, and displays the difference between the two inputs.

As the probes are interchangeable, it is possible to choose the most suitable combination for all applications without having to recalibrate the instrument. The operating principle of the pressure sensor is based on the bending of a membrane in a watertight chamber in contact with the flow of which you want to measure the pressure. The flow may be liquid or gas. The flow rate measure- ment is based on the number of impulses or the frequency of a small fan.

The DO 9704 is able to measure differential or relative pressure for air or non corrosive gases, absolute and relative pressure for measurements in contact with liquids or gases, in 6 different measurement units; temperature (in °C or °F); flow rate in the range for 2 to 2000 litres/minute with a turbine in the measurement units LPM (litres per minute) or IGPM (Imperial Gallons per Minute).

The instrument’s Data Logger function enables it to store up to 30,000 readings. The sampling period is variable from 1 second to 12 hours.

The data acquired may later be transferred to a Personal Computer or a printer by means of the opto-insulated serial line RS 232C. For each value stored the date and time of acquisition are indi- cated; each acquisition block is ended with a report which provides the maximum (peak), minimum and mean values

With the Serial Output function it is possible to obtain the instantaneous values measured by the instrument at the output of the serial line RS 232C, in order to send them to a printer or a computer.

Other functions such as HOLD (which blocks the display), REL (for taking relative measurements) and RECORD (for storing the maximum, minimum and mean values) further enrich the instrument’s performance.

Thanks to its versatility and to its storage capacity, the instrument is particularly suitable for pressu- re measurements in hydraulics, fluidodynamics, in chemical plants and process controls, in pum- ping plants; it is also useful in particular sectors such as moulding and presses for plastics and thermosetting materials, chimney draught, compressors; it may also be used for flow rate and level measurements.

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Contents Instructions Manual Page Pressure and Temperature DATA-LOGGER English Introduction Numbers Keyboard KEYSimbols LIT Besides Function DescriptionNumbers RELSerial Output Simbols LIT Besides Function Numbers DescriptionTom of the display Press the Prog key to move on to step P1 P0+300 Baud 600 BaudP1+ = data dump Storage P1+Hours minutes Seconds This parameter is used for the fol- lowing two functionsFunction P4+ = set year P3+P5+ = set month P6+ = set day P7+ = set hours P8+ = set minutes Self cut-out P9+To stop storage, press the Enter key P10+P10 Complete printing Reduced printingP11 P11+Data Call + Start-StopWhen this operative Operating modeKEY Simbols LIT Besides Ches itself off againSimbols LIT Besides Function Numbers Description Enter If the battery symbol does not flaAfter having taken note Restart itMore than 30,000 acquisitions Probe Connection HOW to MeasureVarious operations Method of Using the Instrument and Warnings Temperature MeasurementErr Instrument Signals and MalfunctionsFUL LOULOW Battery Warning and Battery Replacement Serial Interface RS 232C Storage of the InstrumentParity None Bit Stop bit Protocol Xon/Xoff Command Type ReplyType of terminal Dumping data from the memoryMemory clear Printer Diagram doExample of a Report Printed by the Instrument English Software connection with Windows Hardware connectionOK to confirm the setting one click Mark local Echo one click 100 101 102 Switch on the measuring instrument103 OK to confirm Cancel in the next window104 Parity None105 106 107 108 109 Select END from the pull-down sub-menu one click To end receiving data from an instrumentTo quit running the Hyper Terminal 110Vdc=465.5 Calibrating the Instrument doFlow Rate Measurements 113 Probe connection diagram Instrument doConnection of Probes to the Pressure Gauge Data Logger do 100 105 110 115 SEL RTurbine probe for measuring flow rate Between 4Gauge Classification of Pressure MeasurementsConversion Factors and Tables Psi = kPa Psi = Pa= 3,386 x 103 Pa = 2,491 x 102 Pa118 Connector DIN 45326 8-pole Instrument Technical DataWeight / dimensions 320 gr. / 215x73x38 mm Minimum, Mean, Relative, A-B differential120 121 Order Codes Guarantee Serial line Examples of USE of the KeyboardDisplay blocked 124125 Pressing Data Call repeatedly givesInstrument programming Sets day Sets yearSets hour 127Normal operating Enables self cut-out +Date and time Data printing is reduced 128Activation or disactivation of the Record function Activation or disactivation of the serial outputFunction Serial output active130 Activation and disactivation of the storage function131 Index132 EN61000-4-2, EN61010-1 level Safety
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