Liquisys M COM223-253

Summary

Product identification

Product: Liquisys M COM223/253 Transmitter for oxygen sensors

Applications:

• Wastewater treatment plants and wastewater treatment
• Water treatment and drinking water monitoring
• Surface water: rivers, lakes, sea
• Fish farming
• Boiler feedwater (trace measurement)

Benefits:

• Field or panel-mounted housing
• Universal application
• Easy to use with simple menu structure and calibration options
• Manual contact control and user-defined alarm configuration

Optional Extensions:

• 2 or 4 contacts for limit contacts, P(ID) controller, or timer functions (e.g., rinse processes, Chemoclean).
• Plus package: Configurable current output characteristic, automatic cleaning start, process monitoring, sensor signal live check.
• HART or PROFIBUS-PA/-DP communication.
• Second current output for temperature, main measured value, or actuating variable.
• Current input for flow monitoring or feedforward control.

Measuring System Components

A complete measuring system includes:

• Transmitter: Liquisys M COM223 or COM253
• Oxygen sensor:
  • COS41 for COM2x3-DS/DX
  • COS61 for COM2x3-WS/WX
• Optional: Extension cable, junction box, weather protection cover.

Input

Measured Values:

• Oxygen
• Temperature

Measuring Ranges:

• Oxygen Concentration: 0 to 20 mg/l
• Saturation Index: 0 to 200 % SAT
• Partial Pressure: 0 to 400 hPa (0 to 6 psi)
• Temperature: -10 to 60 °C (can also be displayed in °F)

Signal Input:

• DS/DX version: 0 to 3000 nA
• WS/WX version: Digital communication or 0 to -7500 mV

Binary Inputs:

• Voltage: 10 to 50 V
• Current consumption: Max. 10 mA

Current Input:

• 4 to 20 mA, galvanically isolated
• Load: 260 Ω for 20 mA (voltage drop 5.2 V)

Output

Output Signal:

• 0/4 to 20 mA, galvanically isolated, active
• HART: Signal encoding FSK + 0.5 mA via current output, 1200 baud, galvanically isolated.
• PROFIBUS PA: Manchester Bus Powered (MBP), 31.25 kBit/s (voltage mode), galvanically isolated (IO modules).
• PROFIBUS DP: RS485, data rates up to 1.5 MBd, galvanically isolated (IO modules).
• Signal on alarm: 2.4 or 22 mA in event of error.
• Load: Max. 500 Ω
• Transmission range:
  • Concentration: Δ 0.2 to Δ 20 mg/l
  • Saturation index: Δ 2 to Δ 200 % SAT
  • Partial pressure: Δ 4 to Δ 400 hPa
• Signal resolution: Max. 700 digits/mA
• Separation voltage: Max. 350 VRMS / 500 V DC

Auxiliary Voltage Output:

• Output voltage: 15 V ± 0.6 V
• Output current: Max. 10 mA

Contact Outputs:

• Switching current (ohmic load, cos φ = 1): Max. 2 A
• Switching current (inductive load, cos φ = 0.4): Max. 2 A
• Switching voltage: Max. 250 V AC, 30 V DC
• Switching power (ohmic load, cos φ = 1): Max. 500 VA AC, 60 W DC
• Switching power (inductive load, cos φ = 0.4): Max. 500 VA AC, 60 W DC
• Limit contactors: Pickup/dropout delay 0 to 2000 s

Controller

• Function: Pulse length/pulse frequency controller, continuous controller.
• Behavior: P, PI, PD, PID, basic load dosing.
• Control gain Kp: 0.01 to 20.00
• Integral action time Tn: 0.0 to 999.9 min
• Derivative action time Tv: 0.0 to 999.9 min
• Period length (pulse length controller): 0.5 to 999.9 s
• Frequency (pulse frequency controller): 60 to 180 min⁻¹
• Basic load: 0 to 40 % of max. actuating variable

Alarm

• Function: Latching/momentary contact.
• Alarm threshold adjustment range: O₂ / temperature: entire measuring range.
• Alarm delay: 0 to 2000 s
• Monitoring time for lower limit violation: 0 to 2000 min
• Monitoring time for upper limit violation: 0 to 2000 min

Protocol-Specific Data

HART:

• Manufacturer ID: 11h
• Device type: 0094h
• Transmitter-specific revision: 0001h
• HART version: 5.0
• HART load (communication resistor): 250 Ω

PROFIBUS PA:

• Manufacturer ID: 11h
• Device type: 1518h
• Device revision: 0001h
• Profile version: 2.0

PROFIBUS DP:

• Manufacturer ID: 11h
• Device type: 151Eh
• Profile version: 2.0

Power Supply

• Supply voltage:
  • 100/115/230 V AC +10/-15 %, 48 to 62 Hz
  • 24 V AC/DC +20/-15 %
• Power supply via fieldbus:
  • HART: Not applicable (active current outputs).
  • PROFIBUS PA: 9 V to 32 V, max. 35 V.
  • PROFIBUS DP: 9 V to 32 V, max. 35 V.
• Power consumption: Max. 7.5 VA
• Mains fuse: Fine-wire fuse, semi-delay 250 V/3.15 A

Electrical

Cable Specifications:

• COS61 cable length: Max. 100 m (330 ft)
• COS41 cable length: Max. 50 m (160 ft)

Performance Characteristics

• Reference conditions: Temperature 25 °C (77 °F), Pressure 1013 hPa (15 psi), Air-saturated water.
• Measured value resolution:
  • Oxygen: 0.01 mg/l / 0.1 % SAT / 1 hPa
  • Temperature: 0.1 °C
• Maximum measured error:
  • Display (Oxygen): Max. 0.5 % of measuring range
  • Display (Temperature): Max. 1.0 % of measuring range
  • Signal output (Oxygen): Max. 0.75 % of measuring range
  • Signal output (Temperature): Max. 1.25 % of measuring range
• Repeatability: Max. 0.2 % of measuring range
• Slope adjustment:
  • COS41: 75 to 140 %
  • COS61: 75 to 140 %

Mechanical / Hydraulic

Dimensions:

• Panel-mounted device: Max. 0.7 kg (1.54 lbs.)
• Field device: Max. 2.3 kg (5.07 lbs.)

Materials:

• Panel-mounted device housing: Polycarbonate
• Field housing: ABS PC FR
• Front membrane: Polyester, UV-resistant
• Terminals: Max. 2.5 mm² (14 AWG) cable cross-section.

Environmental Limits:

• Ambient temperature range: -10 to +55 °C (+10 to +130 °F)
• Storage temperature: –25 to +65 °C (-10 to +150 °F)
• Degree of protection:
  • Field device: IP 65 / NEMA 4X
  • Panel-mounted device: IP 54 (front), IP 30 (housing)
• Relative humidity: 10 to 95%, non-condensing
• Degree of contamination: Suitable for pollution degree 2.

Dependability

Calibration:

• Amperometric sensors (COS41): One-point calibration in air, air-saturated water, or medium.
• Optical sensor (COS61): Calibrated on delivery, recalibration in air and at zero point if necessary.

Sensor Live Check (Plus package):

• Checks measuring signal for stagnation, triggering an alarm if no change occurs over a specified period.

Current Output Configuration (Plus package):

• Configurable via table for wide measuring ranges and high resolution (e.g., bilinear, quasi-logarithmic curves).

Automatic Pressure Compensation (DS/WS/WX versions):

• Accounts for atmospheric pressure variations affecting oxygen concentration.

Safety:

• Process Safety: Independently configurable fault-signaling contact and error current. Up to four contacts can be used as limit contacts, P(ID) controller, or cleaning functions. Direct manual operation of contacts is possible.
• Electrical Safety: As per EN/IEC 61010-1:2010, overvoltage category II for installations up to 2000 m (6500 ft) above MSL.
• Overvoltage protection: According to EN 61010-1.

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Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror