Field-installation Type Electric Conductivity Meter (Four-Wire Transmission, For Low-concentration)

HE-200 connects conductivity sensor (ESH/FS Series) and measures conductivity and temperature in the sample water. It is suitable for monitoring pure water/boiler water drainage recovery control and inline measurement of pharmaceutical water conductivity according to USP<645> quality guidelines.

Measurement range

Conductivity: 0 - 2000 μs/cm, 0 -200.0 ms/cm
(TDS 0 - 2000 mg/L)
Temperature: 0 - 100 ℃

Division: Process Water
Manufacturing Company: HORIBA Advanced Techno Co., Ltd.


  • Responds to harsh conditions at the site process
      Operating temperature range(Transmitter):-20 - 55℃
      Rated power supply voltage: AC 90 - 264 V 50/60 Hz
      Robust aluminum die cast (Protection code:IP65)
  • CE Marking and FCC Compliance suitable for use at overseas sites



  • Convenient function to display liquid temperature at the same time(Transmission output available)
  • Responds to various types of temperature compensation
  • Sensor error can be detected immediately by self-diagnosis function
  • Designed to be environmentally friendly (Pb-free) in response to WEEE and RoHS
  • Extensive interfaces (2-channel transmission output, RS-485 compatible, 3-relay output)


Easy maintenance

  • Easy to view big display
  • Easy operation
  • Calibration log memory
  • Screw terminals that do not fall off are used in the terminal block for wiring
Product nameConductivity meter
Sensors in combination2-electrode method conductivity sensor
ESH, ESD, ESL, and FS Series sensor of cell constant 0.01/cm,0.1/cm, or 1.0/cm
Cell constant (/cm)0.01


Conductivity*1μS/cm0.000 to 2.000
0.00 to 20.00
0.000 to 2.000
0.00 to 20.00
0.0 to 200.0
0 to 2000*2
0.0 to 200.0
0 to 2000
mS/m0.0000 to 0.2000
0.000 to 2.000

0.0000 to 0.2000
0.000 to 2.000
0.00 to 20.00
0.0 to 200.0*2

0.00 to 20.00
0.0 to 200.0
mg/L0.00 to 2.00
0.0 to 20.0
0.00 to 2.00
0.0 to 20.0
0 to 200
0 to 200
0 to 2000
Temperature0 to 100 (display range: −10℃ to 160℃)
Conductivity/TDS conversionAs shown in the measuring table.
PerformanceConductivityRepeatabilityWithin ±0.5% of the full scale (response for equivalent input)
Within ±5% of the full scale in the range of 2000 μS/cm or 200 mS/
m for FS-01 sensor
LinearityWithin ±0.5% of the full scale (response for equivalent input)
Within ±5% of the full scale in the range of 2000 μS/cm or 200 mS/m for FS-01 sensor
RepeatabilityWithin ±1.5% of full scale value (response for equivalent input)
LinearityWithin ±1.5% of full scale value (response for equivalent input)
TemperatureRepeatability±0.1℃ (response for equivalent input)
Linearity0.5℃ (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 resistanceMax.: 900Ω
LinearityWithin ±0.08 mA (output only)
RepeatabilityWithin ±0.02 mA (output only)
Output rangeOutput 1Conductivity: Free setting within a measuring range.
Output 2Temperature: Free setting within a range between −10℃ and 160℃
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 and R2Selectable from upper limit alarm, lower limit alarm, USP conductivity requirement, 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 rangeSetting range: within a measuring range
Delay time: 0 seconds to 600 seconds
Contact inputNumber of input points1
Contact typeOpen collector non-voltage a contact
ConditionsON resistance: 100 Ω max.
Open voltage: 24 V DC
Short-circuit current: 12mA DC max.
Contact functionExternal input for transmission holding.
Communication typeRS-485
Signal type2 wire system, isolated from the input circuit
Not isolated from transmission circuit
Temperature elementPlatinum resistor: 1 kΩ (0℃)
Temperature compensation
  • 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℃.)
Temperature calibration1 point calibration comparing to reference thermometer
CalibrationConductivityBased on parameter input of coefficient for the sensor cell constant.
TDS conversionConversion by user-defined coefficient value (TDS calculation is 0.30 to 1.00 times of sample conductivity by μS/cm.)
Self-checkSensor diagnosis errorTemperature sensor short-circuit, temperature sensor disconnection, and out of the temperature measurement range
Meter errorCPU error, ADC error, and memory error
Operating temperature range−20℃ to 55℃ (without freeze)
Operating humidity rangeRelative humidity: 5% to 90% (without condensation)
Storage temperature−25℃ to 65℃
Power supplyRated power supply voltage100 V to 240 V AC ±10% 50/60 Hz
Power consumption15 VA (max.)
OthersWith 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
External dimensions180 (W) × 155 (H) × 115 (D) mm (excluding mounting brackets)
MassMain body: Approx. 3.5 kg
Hood and mounting brackets: Approx. 1 kg

*1:  Only the sanitary sensor (FS-01 series) is applied.
*2:  Conductivity measurement and TDS conversion measurement cannot be selected at the same time.
*3:  When the sensor cable, the transmission cable, or the contact input cable is extended to 30 m or longer, the surge test specified in the EMC directive for CE marking is not applied.


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.

Request for Information

Do you have any questions or requests? Use this form to contact our specialists. * These fields are mandatory.