pH METER - CONDUCTIVITY METER - THERMOMETER, Model : HD2156.1 AND HD2156.2, Brand : DeltaOhm

The HD2156.1 and HD2156.2 are portable instruments with a large LCD display. They measure pH, mV, redox potential ( ORP) , conductivity, liquid resistivity, total dissolved solids ( TDS) and salinity using combined 4-ring and 2-ring conductivity/ temperature probes. Temperature only is measured by Pt100 or Pt1000 immersion, penetration or contact probes. The pH electrode calibration, as well as manual, can be carried out on one, two or three points and the calibration sequence can be chosen from a list of 13 buffers. The probe calibration can be performed automatically in one or more of the 147¼ S, 1413¼ S, 12880¼ S or 111800¼ S/ cm conductivity calibration solutions. The HD2156.2 instrument is a datalogger. It memorizes up to 20, 000 sets of three measurements composed of pH or mV, conductivity or resistivity or TDS or salinity and temperature: these data 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 HD2156.1 and HD2156.2 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 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 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 HD2156.2 Type 2000 pages containing 10 samples each Quantity 20, 000 sets of three measurements composed of pH or mV, Ç or © or TDS or salinity and temperature. 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 HD2156.2 Type 1.1 - 2.0 electrically isolated Connections pH/ mV input Female BNC connector Conductivity input 8-pole male DIN45326 connector Serial interface and USB 8-pole MiniDin connector Mains adapter 2-pole connector ( positive at centre) Measurement of pH by Instrument Measurement range -2.000… + 19.999pH Resolution 0.01 or 0.001pH selectable from menu Accuracy ± 0.001pH ± 1digit Input impedance > 1012© Calibration error @ 25° C | Offset| > 20mV Slope > 63mV/ pH or Slope 106.5% or Sensitivity < 85% Measurement of mV by Instrument Measurement range -1999.9… + 1999.9mV Resolution 0.1mV Accuracy ± 0.1mV ± 1digit Drift after 1 year 0.5mV/ year Measurement of conductivity by Instrument Resolution with K cell= 0.1 0.01¼ S/ cm in range 0.00… 19.99¼ S/ cm Measurement range ( K cell= 1) Resolution 0.0… 199.9¼ S/ cm / 0.1¼ S/ cm 200… 1999¼ S/ cm / 1¼ S/ cm 2.00… 19.99mS/ cm / 0.01mS/ cm 20.0… 199.9mS/ cm / 0.1mS/ cm Accuracy ( conductivity) ± 0.5% ± 1digit Measurement of resistivity by Instrument Measurement range / Resolution 4.0… 199.9© / 0.1© 200… 999© / 1© 1.00k… 19.99k© / 0.01k© 20.0k… 99.9k© / 0.1k© 100k… 999k© / 1k© 1… 10M© / 1M© Accuracy ( resistivity) ± 0.5% ± 1digit Measurement of total dissolved solids ( with coefficient Ç / TDS= 0.5) Resolution with K cell= 0.1 0.05mg/ l in range 0.00… 19.99mg/ l Measurement range ( K cell= 1) / Resolution 0.0… 199.9 mg/ l / 0.5 mg/ l 200… 1999 mg/ l / 1 mg/ l 2.00… 19.99 g/ l / 0.01 g/ l 20.0… 199.9 g/ l / 0.1 g/ l Accuracy ( total dissolved solids) ± 0.5% ± 1digit Measurement of salinity Measurement range / Resolution 0.000… 1.999g/ l / 1mg/ l 2.00… 19.99g/ l / 10mg/ l Accuracy ( total dissolved solids) ± 0.5% ± 1digit Automatic/ manual temperature compensation 0… 100° C with ± T that can be selected from 0.00 to 4.00% / ° C Reference temperature 20° C or 25° C Ç / TDS conversion factor 0.4… 0.8 Cell constant K ( cm-1) 0.1, 0.7, 1.0 and 10.0 Standard solutions automatically detected ( @ 25° C) 147 ¼ S/ cm 1413 ¼ S/ cm 12880 ¼ S/ cm 111800 ¼ S/ cm Measurement of temperature by Instrument Pt100 measurement range -50… + 200° C Pt1000 measurement range -50… + 200° C Resolution 0.1° C Accuracy ± 0.25° C Drift after 1 year 0.1° C/ year