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The HD2109.1 and HD2109.2 are portable instruments with a large LCD display. They measure the concentration ( in mg/ l) of dissolved Oxygen in liquids, the saturation index ( in % ) and the temperature using SICRAM combined probes of polarographic type with two or three electrodes and integrated temperature sensor. Temperature only is measured by Pt100â SICRAM or direct 4 wireâ immer-sion, penetration or contact probes. Thanks to an internal pressure sensor, the instruments automatically compensate for barometric pressure. The instrument anticipates automatic compensation of the Oxygen probe membrane permeability and of the salinity of the liquid being examined. The dissolved Oxygen probeâ s quick calibration function guarantees timely correctness of the performed measurements. The dissolved Oxygen and temperature probes are fitted with an automatic detection module, with the factory calibration settings already being memorized inside. The HD2109.2 is a datalogger. It memorizes up to 18, 000 dissolved Oxygen con- centration, saturation index measurements, barometric pressure and temperature samples which can be transferred from the instrument connected to a PC via the multi-standard RS232C serial port and USB 2.0. The storing interval, printing, and baud rate can be configured using the menu. The HD2109.1 and HD2109.2 models are fitted with an RS232C serial port and can transfer the acquired measurements to a PC or to a portable printer in real time. The Max, Min and Avg function calculates the maximum, minimum or average values. Other functions include: the relative measurement REL, the Auto-HOLD function, and the automatic turning off which can also be disabled. The instruments have IP67 protection degree. INSTRUMENT TECHNICAL CHARACTERISTICS Instrument Dimensions ( Length x Width x Height) 185x90x40mm Weight 470g ( complete with batteries) Materials ABS, rubber Display 2x41D2 digits plus symbols Visible area: 52x42mm Operating conditions Working temperature -5⦠50° C Storing temperature -25⦠65° C Working relative humidity 0⦠90% RH without condensation Protection degree IP67 Power Batteries 4 1.5V type AA batteries Autonomy 200 hours with 1800mAh alkaline batteries Power absorbed with instrument off 20¼ A With dissolved oxygen probe 40¼ A Mains Output mains adapter 9Vdc / 250mA Security of memorized data Unlimited, independent of battery charge conditions Time Date and time Schedule in real time Accuracy 1min/ month max error Measured values storage - model HD2109.2 Type 2000 pages containing 9 samples each Quantity 18, 000 samples Storage interval 1s⦠3600s ( 1hour) Serial interface RS232C Type RS232C electrically isolated Baud rate Can be set from 1200 to 38400 baud Data bit 8 Parity None Stop bit 1 Flow Control Xon/ Xoff Serial cable length Max 15m Immediate print interval 1s⦠3600s ( 1hour) USB interface - model HD2109.2 Type 1.1 - 2.0 electrically isolated Connections Input for Oxygen and temperature probes 8-pole male DIN45326 connector Serial and USB interface 8-pole MiniDin connector Mains adapter 2-pole connector ( positive at centre) Measurement of the concentration of dissolved Oxygen Measurement range 0.00⦠90.00mg/ l Resolution 0.01mg/ l Accuracy ( 60⦠110% , 1013mbar, 20⦠25° C) ± 0.03mg/ l± 1digit Measurement of the saturation index of dissolved Oxygen Measurement range 0.0⦠600.0% Resolution 0.1% Accuracy ± 0.3% ± 1digit Measurement of barometric pressure Measurement range 0.0⦠1100.0mbar Resolution 0.1mbar Accuracy ± 2mbar± 1digit between 18 and 25° C ± ( 2mbar+ 0.1mbar/ ° C) in the remaining range Setting the salinity Measurement range 0.0⦠70.0mg/ l Resolution 0.1mg/ l Temperature measurement with the sensor inside the dissolved Oxygen probe Measurement range 0⦠+ 45° C Resolution 0.1° C Accuracy ± 0.25° C Drift after 1 year 0.1° C/ year Temperature measurement by Instrument with Pt100 probe Pt100 measurement range -200⦠+ 650° C Resolution 0.1° C Accuracy ± 0.25° C Drift after 1 year 0.1° C/ year
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