Field-installation type electric resistivity meter (resistivity meter)

For measuring the electric resistivity of UPW (ultra-pure water).

Combined with the electric resistivity sensor (ERF series), it measures the electric resistivity and temperature of aqueous solutions. Suitable for measuring electric resistivity of UPW.


Divisão: Process Water
Fabricante: HORIBA Advanced Techno Co., Ltd.

Enables measurements with minimal error

Measurements are affected less by ambient temperature and sample temperature, enabling accurate measurements with less error.

We provide equipment and sensor calibration services

Temperature sensor offset calibration is offered as well as converter and sensor combination calibration services. *Option

Highly responsive temperature sensor

Helps to minimize fluctuations in measurement values due to delayed temperature compensation in the event of sudden changes in water temperature.

Product nameResistivity meter
2-electrode method resistivity sensor (ERF-001 Series) of cell constant 0.01/cm
Measuring rangeResistivityMΩ•cm0.000 to 2.0000.00 to 20.00 (*Note 1)
kΩ•cm0.00 to 20.000.0 to 200.0 (*Note 1)
Temperature0℃ to 100℃ (Display range: −10℃ to 110℃)
ResistivityAs shown in the measuring table.
PerformanceResistivityRepeatabilityWithin ±0.1% of the full scale (response for equivalent input)
LinearityWithin ±0.5% of the full scale (response for equivalent input)
TemperatureRepeatability±0.1℃ (response for equivalent input)
Linearity±0.5℃ (response for equivalent input)
Number of output2 (The negative terminals for transmission outputs are internally connected at the same electric potential)
Output type4 mA to 20 mA DC: input/output isolated type
Load resistanceMaximum: 900Ω
LinearityWithin ±0.08 mA (output only)
RepeatabilityWithin ±0.02 mA (output only)
Output rangeOutput 1Resistivity: Free setting within a measuring range.
Output 2Temperature: Free setting within a range between −20 and 130℃
Occasional out for errorHold or burnout to either 3.8 mA or 21 mA
Transmission holdIn the maintenance mode, transmission signal is held at the latest value or preset value.
In the calibration mode, transmission signal can be alive or held.
Contact outputNumber of output3
Output typeNo-voltage contact output
Contact typeRelay contact; SPDT (1c)
Contact capacity250 V AC, 3 A; 30 V DC, 3 A (resistance load)
R1, R2Selectable from upper limit alarm, lower limit alarm, and currently holding of transmission output.
(The contact is closed during alarm operation, opened normally and while the power is down.)
FAILError alarm
(Closed in the normal state, opened in the failure state or while the power is down.)
Alarm setting range
  • Setting range: within a measuring range
  • Delay time: 0 to 600 seconds
Contact inputNumber of input points1
Contact typeNo-voltage "a" contact for open collector
ConditionsON resistance: 100 Ω max.
Open voltage: 24 V DC
Short-circuit current: 12 mA DC max.
Contact functionExternal input for transmission holding.
Signal type2 wire system, isolated from the input circuit
Not isolated from transmission circuit
Applicable temperature
Platinum resistor: 1 kΩ (0℃)
Compensation method
  • Temperature characteristic of NaCl (reference temperature: 5℃ to 95℃)
  • Arbitrary temperature coefficient input (reference temperature: 5℃ to 95℃; temperature coefficient: +/−3%/℃)
  • No temperature compensation
    One of the three ways of compensation is selectable.
    (In the de-ionized water area, the temperature compensation for pure water is automatically performed in both NaCl and arbitrary temperature coefficient compensation settings.)
Temperature compensation
0℃ to 100℃ (However, the compensation calculation is extended lower than 0℃ or higher than 100℃.)
CalibrationResistivityBased on parameter input of coefficient for the sensor cell constant.
TemperatureComparison to the accurate thermometer
Both deviation and coefficient of RTD are taken into account for calibration.
Other functionUPW standard resistivity inputSelect one from the next.
182.3 kΩ•m (standard), 181.8 kΩ•m, 182.4 kΩ•m,
18.23 MΩ•cm (standard), 18.18 MΩ•cm, or 18.24 MΩ•cm
Clipping functionIf the measured value exceeds the user setting value for clipping, the measured data will be held at the clipping value.
Self-checkSensor diagnostic errorTemperature sensor short-circuit, temperature sensor disconnection, and out of the temperature measurement range
Converter errorCPU, ADC, and memory errors
−20℃ to 55℃ (without freeze)
humidity range
Relative humidity: 5% to 90% (without condensation)
−25℃ to 65℃
Power supplyRated power supply voltage100 V to 240 V AC ±10% 50/60 Hz
Power consumption15 VA (max)
OtherWith power switch for maintenance use
CE markingEMC    :EN61326-1
     Class A, Industrial electromagnetic environment
Safety   :EN61010-1
RoHS    :EN50581
      9. Industrial monitoring and control instruments
FCC rulesPart15 Class A
StructureInstallationOutdoor installation type
Installation methodMount on 50 A pole or wall
Protection codeIP65
Case materialAluminum alloy (coated with epoxy-denatured melamine resin)
Material of fittingsSUS304
Material of hoodSUS304 stainless steel (coated with epoxy denatured melamine resin)
Material of windowPolycarbonate
Display elementReflective monochrome LCD
180 (W) mm × 155 (H) mm × 115 (D) mm (excluding cover and mounting brackets)
MassMain body: Approx. 3.5 kg; cover and mounting brackets: Approx. 1 kg


  • Note 1  : Without temperature compensation, 0.0-100.0 MΩ•cm(0-1000 kΩ•m) can be displayed.
  • Note 2  : When the sensor cable, the transmission cable, or the contact input cable is extended by 30 m or more, the surge test under the EMC Directive for CE marking is not applied.
  • Note 3  : An arrester (spark over voltage: 400 V) is implemented for transmission output, contact input, and communication. However, use a most suitable surge absorption element on the connection lines in accordance with the ambient environment, the situation of equipment installed, and the externally connected equipment.

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