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  • New item   Conductivity transmitter | panel-mount 96×96 mm | 0–200 mS/cm | 0/4–20 mA | 2 limit relays | 230 V AC | Endress+Hauser Liquisys CLM221-CD010 | used | 431130 3Z

    Conductivity transmitter | panel-mount 96×96 mm | 0–200 mS/cm | 0/4–20 mA | 2 limit relays | 230 V AC | Endress+Hauser Liquisys CLM221-CD010 | used | 431130 3Z

    Code: CLM221-CD010
    Inquire about this item
    Price 193.60 € VAT incl.
    ( 160.00 € VAT excl. )
  • Product description

    Conductivity transmitter | panel-mount 96×96 mm | 0–200 mS/cm | 0/4–20 mA | 2 limit relays | 230 V AC | Endress+Hauser Liquisys CLM221-CD010 | used | 431130 3Z

    The Endress+Hauser Liquisys CLM221-CD010 is a panel-mount conductivity transmitter in a 96×96 mm housing for two-electrode conductivity cells with a Pt100 temperature sensor. It displays conductivity and temperature, provides a galvanically isolated 0/4–20 mA signal and controls two limit relays and one alarm relay. This unit is used and is sold in the “Quality used products” category.

    Key point:
    The CLM221 is no longer manufactured, so for a running system built around this model the same order code is the fastest and cheapest fix: the same 92×92 mm cut-out, the same terminals and the same control logic. No need to rework the panel door, change drawings or reprogram the PLC for a new device.
    Measuring range
    0.0 µS/cm – 200.0 mS/cm
    Output
    0/4–20 mA, galvanically isolated
    Relays
    2 limit + 1 alarm, 250 V AC / 5 A
    Mounting
    Panel, cut-out 92×92 mm (DIN 43700)

    Operating principle

    The transmitter is inserted into the panel door through a 92×92 mm cut-out and clamped with fixing brackets; installation depth is approx. 175 mm. At the rear there are plug-in terminal blocks with 3, 9 and 14 pins (up to 2.5 mm²) for the conductivity cell via measuring cable (e.g. CYK 71), the Pt100 sensor, power supply, mA output and relays.

    The device measures the conductivity of a two-electrode cell. Depending on the cell constant (0.01, 0.1, 1 or 10 cm⁻¹), one of 10 ranges is selected – from 0–2 µS/cm for ultrapure water up to 0–200 mS/cm for concentrated solutions. The Pt100 measures temperature in the range −9.9…+125 °C and automatically compensates conductivity to the 25 °C reference temperature; in addition to linear compensation, a dedicated ultrapure water compensation is available.

    The two-line LCD shows conductivity and temperature at the same time. The 0/4–20 mA signal goes to a PLC, SCADA or recorder, the two limit relays (hysteresis 0–10 %, delay 0–2000 s) control e.g. blowdown or dosing, and the alarm relay reports a prolonged limit violation or a Pt100 fault. The HOLD input (10–50 V) freezes the outputs while the cell is being cleaned or calibrated.

    Why choose the CLM221-CD010?
    One 96×96 mm device replaces a meter, a signal converter and two limit relays, so a conductivity control point needs no separate relay logic or extra modules.

    Technical specifications

    Product type Conductivity (resistivity) transmitter, panel-mount
    Manufacturer Endress+Hauser
    Series / model Liquisys CLM221
    Order code CLM221-CD010 (221 – panel housing; CD – conductivity, 2-electrode cell; 0 – 230 V AC; 10 – basic version)
    Additional marking 431130 3Z
    Condition Used; model discontinued by the manufacturer
    Measured variables Conductivity, resistivity, temperature
    Conductivity range 0.000 µS/cm … 200.0 mS/cm (depending on cell constant 0.01–10 cm⁻¹)
    Temperature sensor Pt100; measurement and compensation −9.9…+125 °C
    Temperature compensation Linear and ultrapure water; reference temperature 25 °C
    Calibration Via CAL key, adjustment range 80–120 %
    Max. cable length 100 m (conductivity), 20 m (resistivity)
    Analogue output 0/4–20 mA, galvanically isolated, load up to 500 Ω, isolation up to 350 V RMS / 500 V DC
    Relay outputs 2 limit + 1 alarm, potential-free changeover contacts; 250 V AC / 30 V DC; 5 A (cos φ = 1), 3 A (cos φ = 0.4)
    HOLD input 10–50 V, up to 10 mA
    Auxiliary voltage 15 V ± 0.6 V, up to 30 mA
    Accuracy Display ≤ 0.5 % of full scale; output 0.75 %; repeatability ≤ 0.2 %
    Display LCD, 2 lines (measured value and temperature)
    Power supply 230 V AC +10/−15 %, 48–62 Hz, up to 7.5 VA; fuse 250 V / 1 A, slow-blow
    Ingress protection IP54 (front), IP30 (housing)
    Operating conditions −10…+55 °C (limit −20…+60 °C), relative humidity 10–95 %, non-condensing
    Dimensions 96 × 96 × 145 mm, installation depth approx. 175 mm
    Panel cut-out 92 (+0.5) × 92 (+0.5) mm to DIN 43700
    Terminals Plug-in blocks with 3, 9 and 14 pins, up to 2.5 mm²
    Materials Housing – polycarbonate, front – UV-resistant polyester
    Weight Up to 0.7 kg
    EMC / marking EN 50081-1, EN 50082-1, CE

    Main functions

    • Conductivity and temperature on one display – the operator sees the process state without an extra indicator.
    • Automatic temperature compensation with Pt100 – readings stay comparable all year round, regardless of water temperature.
    • Two limit relays with delay up to 2000 s – stable blowdown or dosing control without relay chatter.
    • Alarm relay – reports a prolonged limit violation and a Pt100 sensor fault.
    • HOLD input – cleaning or calibrating the cell does not trigger false alarms.
    • Galvanically isolated 0/4–20 mA output – less interference and fewer ground loops at PLC inputs.
    • Calibration via CAL key – quick on-site adjustment with a reference solution.

    Where is it used?

    • Ultrapure water monitoring
    • Water treatment plants
    • Ion exchangers and regeneration control
    • Reverse osmosis systems
    • Cooling water salinity control and blowdown
    • Boiler water and condensate monitoring
    • Wastewater and concentrated solution monitoring

    Use by need

    Plant energy engineer.
    Replaces a failed CLM221 with the same code – no panel rework, drawing changes or new documentation.
    Water treatment service company.
    A spare unit in stock cuts the customer’s downtime to a single shift.
    Automation / SCADA integrator.
    The 0/4–20 mA output and relay contacts connect to existing logic without new protocols or drivers.

    Practical application

    If the CLM221 monitoring cooling water in a boiler house stops working and a new-generation transmitter would need a different cut-out and rewiring, the CLM221-CD010 goes into the same opening, the plug-in terminal blocks are moved over, the cell constant, temperature coefficient and limits are entered – and blowdown is controlled automatically again the same day.

    Pros

    • Direct replacement with the same code – same cut-out and terminals
    • mA output and 3 relays in one 96×96 mm device
    • Galvanically isolated 0/4–20 mA output
    • Pt100 fault monitoring via the alarm relay
    • Dedicated ultrapure water temperature compensation
    • Wide cell constant range 0.01–10 cm⁻¹
    • Much lower price than a new-generation measuring system

    Cons / limitations

    • Used device, model discontinued – manufacturer warranty does not apply
    • 230 V AC supply only – a 24 V DC system needs a different version
    • No digital interface (HART, PROFIBUS, Modbus) – for a new project choose Liquisys M CLM223 or a newer transmitter
    • Two-electrode (conductive) cells only, inductive cells cannot be connected
    • Housing IP30 – outdoors or in damp rooms only inside an IP65 protective enclosure

    Safety and installation notes

    • Installation and wiring by a qualified electrician only, with the supply and relay circuits disconnected – relay contacts may carry external voltage.
    • Check the voltage on the nameplate before connecting: this version is for 230 V AC, do not connect it to a 24 V or 115 V supply.
    • Route the cell cable separately from power cables and use a shielded conductivity measuring cable (e.g. CYK 71) no longer than 100 m.
    • Do not load relay contacts above 5 A resistive or 3 A inductive; switch larger loads via an interposing relay or contactor.
    • Do not install outdoors or in damp rooms without an IP65 protective enclosure – the rear is IP30.
    • After installation enter the cell constant, temperature coefficient and limits and calibrate with a reference solution – settings of the old device are not transferred.

    Quick selection guide

    96×96 mm
    0–200 mS/cm
    0/4–20 mA
    2 + 1 relays
    230 V AC
    Pt100
    Suitable when you need:
    • to replace an existing CLM221 with the same code
    • conductivity control with limit relays without a separate PLC
    • a spare unit in stock for critical water monitoring
    Check before use:
    • the code of the old device (CD – conductivity, MM – resistivity) and supply voltage
    • cell type and constant (2-electrode, 0.01–10 cm⁻¹)
    • whether the cell has a Pt100 sensor
    • the 92×92 mm cut-out and free depth of approx. 175 mm
    Important reminder: this is a transmitter, not a temperature sensor or a conductivity cell. The cell with Pt100 and the measuring cable are not included.

    FAQ

    Is this a temperature sensor?
    No – it is a conductivity transmitter; it measures temperature via a connected Pt100 sensor, usually built into the conductivity cell.
    Will it replace my failed CLM221?
    Yes, if the old unit is the CLM221 conductivity version (CD) with 230 V AC supply – the cut-out and terminals match.
    Which cells can be connected?
    Two-electrode conductivity cells with a constant of 0.01–10 cm⁻¹, for example E+H CLS15, CLS19, CLS21 or CLS30.
    Can it be connected to a PLC?
    Yes – via the galvanically isolated 0/4–20 mA output (load up to 500 Ω) and potential-free relay contacts.
    Can it be installed outdoors?
    Only in an IP65 protective enclosure (E+H 50054413), as the panel version is IP54 at the front and IP30 at the housing.
    Is the device new?
    No – it is used; please ask about its condition before purchase by phone +370 658 01033.

    Endress+Hauser Liquisys CLM221-CD010 – panel-mount conductivity transmitter

    Used E+H Liquisys CLM221-CD010: 96×96 mm panel-mount conductivity transmitter 0–200 mS/cm with Pt100 compensation, 0/4–20 mA output and three relays – a direct replacement for existing water treatment, cooling water and boiler house monitoring systems.

    Published: 2026-11-04 · Data verified against the manufacturer’s datasheet (TI 141C): 2026-11-04

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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