Paroscientific, Inc.

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Transducer Electrical CharacteristicsThe basic Digiquartz® transducers, Series, 2000, 3000, 4000, and5300, provide frequency output signals for pressure and temperature.The nominal pressure signal frequency is a 10% change within theband of 30 kHz to 42 kHz. The temperature signal is a nominal 45ppm/°C sensitivity within the band of 168 kHz to 172 kHz. Theyoperate from 6 to 25 VDC at 1.3 mA and are reverse polarityprotected.Current drain increases when driving long lines or low impedances.Refer to the SCD supplied with the transducer for any special inputpower options or considerations.Standard wire color code for a basic Digiquartz® transducer is asfollows:REDBLACKBLUEWHITE6 to 25 VDCSignal and power groundPressure signal, 30 to 42 kHzTemperature signal, 168 to 172 kHzThe pressure and temperature signal wires are configured as twistedpairs. Each signal line is twisted with a negative (black) wire tominimize cross coupling between the temperature and pressuresignals. If the signal lines are to be extended, the black wires shouldbe continued and twisted with the signal wire at a rate of 4 to 5 turnsper inch.4
Intelligent TransmittersSeries 1000, 6000, and 9000 Intelligent Transmitters feature dual RS-232 and RS-485 serial ASCII interfaces and provide outputs directlyin the user’s choice of pressure units. All transmitters have 15-pinhigh-density male D-subminiature connectors. These devices canalso drive a remote Model 715 display. The Intelligent transmittersoperate from external DC power, 6 VDC to a maximum of 16 VDC.Current drain varies from 3 mA to 30 mA, depending on the samplerate. Power module kits are available to adapt to 110 and 220 voltsources. Reference Operation Manual, Doc. No. 8819-001.Please refer to the Specification Control Drawing (SCD)accompanying each unit for special features and options.Intelligent Standards and DisplaysThe Model 740 and 760 Intelligent Standards and the Model 730Intelligent Display feature RS-232 serial ASCII interfaces and provideoutputs directly in the user’s choice of pressure units. All intelligentstandards and displays have 9-pin D-subminiature connectors. Whenconnecting to a 9-pin computer interface, a straight ribbon cableconnection may be used between the Model 730, 740, or 760 and astandard 9 pin serial COM port and a PC. A null modem is notnecessary. Reference the Programming and Operation Manual, Doc.No. 8107-001 for details.The Models 730 and 740 operate from external DC power, 5 VDC toa maximum of 25 VDC. Current consumption varies from 12 mA to25 mA, depending on the sample rate. The Model 730 and 740 willrun on the internal set of 4 AA batteries for up 70 hours. Powermodule kits are available to adapt to 110 and 220 VAC sources. Theexternal AC adapter supplied with these units is for AC operation onlyand does not recharge the batteries. Reference Programming andOperation Manual, Doc. No. 8107-001.The Model 760 Portable Field Standard has an internal 6V sealedlead acid battery with a capacity of 3 ampere hours. Battery life forthe Model 760 is up to 200 hours. The Model 760 internal batterycharger will trickle charge the battery whenever it is connected to ACpower. The internal charger will not allow the battery to overchargeand may be left on indefinitely.The first indication of a low battery is a decimal point between eachdigit on the display. The second indication is a set of dashed linesthat will slowly fade as the battery is discharged.5
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