Phone: 253-927-6186
 Email: sales@hotektech.com

HD2156.1 pH meter-Conductivity Thermometer complete with pH electrode KP30, combined
conductivity/temperature probe SP06T, temperature probe TP87, buffer solution 4,01pH and 6,86pH,
conductivity solution 12.880μS. Storage of maximum, minimum, average value, RS232 C output for data
transfer in real time to a PC or printer. Functions: REL, HOLD and auto power off which can be disabled,
IP 67 protection degree.
HD2156.2 pH meter-Conductivity Thermometer complete with pH electrode KP30, combinedbr
conductivity/temperature probe SP06T, temperature probe TP87, buffer solution 4,01pH and 6,86pH,
conductivity solution 12.880μS. Datalogger which stores the maximum, minimum, average value and can
store up to 20.000 sets of three data. RS232 C/ USB output for data transfer in real time to a PC or printer.
Functions: REL, HOLD and auto power off which can be disabled, IP 67 protection degree.

HD2156 pH and Conductivity Meter

Model  Description 
HD2156.1  HD2156.1 pH meter-Conductivity Thermometer
HD2156.2  HD2156.2 pH meter-Conductivity Thermometer Data logger

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 147μS, 1413μS, 12880μS or
111800μS/cm conductivity calibration solutions.

HD 2156 specifications
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  >10Exp12Ω 
Calibration error @25°C  |Offset| > 20mV
Slope > 63mV/pH or Slope < 50mV/pH
Sensitivity > 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
Measurement range (K cell=0.1) 0.01μS/cm in range 0.00…19.99μS/cm
Resolution 0.0 - 199.9μS/cm / 0.1μS/cm
200 - 1999μS/cm / 1μS/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 - 199.9Ω / 0.1Ω
200 - 999Ω / 1Ω
1.00k - 19.99kΩ / 0.01kΩ
20.0k - 99.9kΩ / 0.1kΩ
100k - 999kΩ / 1kΩ
1 - 10MΩ / 1MΩ 
Accuracy (resistivity)  ±0.5% ±1digit 
Measurement of total dissolved solids (with coefficient χ/TDS=0.5) 
Measurement range (K cell=1)   0.05mg/l in range 0.00…19.99mg/l 
Resolution   0.0 - 199.9 mg/l / 0.5 mg/l (with K cell=0.1)
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 
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 

HD 2106.1 Conductivity-Thermometer measures conductivity, liquid resistivity, total dissolved solids, salinity
and temperature. Storage of maximum, minimum, average value, RS232 C output for data transfer in real time
to a PC or printer. Functions: REL, HOLD and auto power off which can be disabled, IP 67 protection degree.
Supplied with carrying case, 4 batteries, instruction manual, Software DeltaLog 9. Conductivity probes,
calibrating solutions, TP47… series temperature probes with SICRAM module and cables for data download
have to be ordered separately.
HD 2106.2 Conductivity-Thermometer measures conductivity, liquid resistivity, total dissolved solids, salinity
and temperature. Datalogger which can store the maximum, minimum, average value and can store up to
36,000 samples. RS232 C/ USB output for data transfer in real time to a PC or printer. Functions: REL, HOLD
and auto power off which can be disabled, IP 67 protection degree. Supplied with carrying case, instruction
manual, Software DeltaLog 9. Conductivity probes, calibrating solutions, TP47… series temperature probes
with SICRAM module and cables for data download have to be ordered separately.

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Company
Hotek Technologies, Inc
tel: 253-927-6186
sales@hotektech.com
services@hotektech.com
info@hotektech.com