Liquiline System CA80TN

Summary

Product identification

The Liquiline System CA80TN is a wet-chemical analyzer designed for the near-continuous determination of total nitrogen (TN) in liquid media. It utilizes UV photometry with a colorimetric method, digesting nitrogen compounds at elevated temperatures and alkaline conditions to oxidize them to nitrate, which is then measured via UV absorption.

Application

This analyzer is suitable for:

• Monitoring wastewater treatment plant outlets
• Controlling surface water quality
• Monitoring and controlling industrial wastewater treatment

Key Features and Benefits

• Digital Memosens Technology: Enables digital, non-contact signal transmission for enhanced safety and reliability. Allows for sensor calibration in a laboratory, increasing process availability. Supports predictive maintenance by recording sensor data (operating hours, temperature, sterilizations).
• Expandability: Can be upgraded to a measuring station by connecting up to 4 Memosens sensors.
• Low Maintenance Costs: Designed for reduced maintenance requirements.
• Digital Fieldbuses: Supports various digital communication protocols including PROFINET, PROFIBUS DP, Modbus TCP, Modbus RS485, and Ethernet IP. Features an integrated web server.
• Modular Design: Allows for retrofitting extension modules for expanded functionality (e.g., additional current outputs, relays, digital communication).
• Data Logging: Features integrated ring or stack memories for recording analog values, events, and analyzer data. Supports up to 2 data logbooks with 20,000 entries each. Digital sensors can log up to 8 data logbooks with 150,000 entries each.

Measuring Principle

The analyzer employs UV photometry. A pulsed strobe lamp emits light that passes through the sample in a cuvette. A beam splitter directs the light to measuring and reference detectors. Filters allow specific wavelengths to pass. The ratio of the measuring to reference wavelength signals is calculated to minimize the effects of turbidity and lamp aging. This ratio change, which is non-linear, is converted to the total nitrogen concentration.

Measuring System Components

A complete measuring system includes:

• Liquiline System CA80TN analyzer
• Reagents and standard solutions (ordered separately)
• Suction strainer or optional Y strainer with process connection

Performance Characteristics

Total Nitrogen Measurement

• Measuring Ranges:
  • CA80TN-**S5: 0 to 10 mg/l total-N
  • CA80TN-**S6: 0 to 50 mg/l total-N
  • CA80TN-**S7: 0 to 200 mg/l total-N
• Maximum Measured Error (Analyzer):
  • 0 to 10 mg/l (ppm) N (undiluted): 0.1 mg/l (ppm) N ≤ 2 mg/l; 3 % end of measuring range > 2 mg/l
  • 0 to 20 / 50 / 100 mg/l (ppm) N: 3 % end of measuring range
  • 0 to 200 mg/l (ppm) N: 5 % end of measuring range
• Limit of Detection (LOD): 0.06 mg/l (ppm) N
• Repeatability:
  • 0 to 10 mg/l (ppm) N: 0.06 mg/l (ppm) N or 3 % of the measured value
  • 0 to 50 mg/l (ppm) N: 0.3 mg/l (ppm) N or 3 % of the measured value
  • 0 to 200 mg/l (ppm) N: 2 mg/l (ppm) N or 5 % of the measured value
• Measuring Interval: Continuous (approx. 55 min), adjustable from 45 min to 24 h.

Sensor Inputs

• Maximum measurement error for sensor inputs: Refer to the documentation of the connected sensor.
• Repeatability of sensor inputs: Refer to the documentation of the connected sensor.

Current Inputs and Outputs

• Maximum Measurement Error:
  • < 20 μA (at current values < 4 mA)
  • < 50 μA (at current values 4 to 20 mA) at 25 °C (77° F)
  • Additional error: < 1.5 μA/K
• Repeatability: Typically < 0.02 % of the span.

Input

• Measured Variables: Total nitrogen [mg/l, ppm]
• Types of Input:
  • 1 to 4 digital sensor inputs for Memosens protocol (optional)
  • Analog current inputs (optional)
  • Binary inputs (optional)
• Input Signal: 2 x 0/4 to 20 mA (optional), passive, potentially isolated.
• Cable Specification (Memosens): Max. 100 m (330 ft) using Memosens data cable CYK10 or sensor fixed cable.

Output

• Output Signal:
  • 2 x 0/4 to 20 mA, active, potentially isolated (standard)
  • Up to 6 x 0/4 to 20 mA, active, potentially isolated (with extension modules)
  • Binary outputs
• Relay Outputs:
  • 1 alarm relay (changeover contact)
  • Optional: 2 or 4 additional relays (changeover contacts)
  • Maximum load: 0.5 A (alarm relay), 2.0 A (other relays)
• Signal on Alarm: Adjustable as per NAMUR Recommendation NE 43. Failure current factory setting: 21.5 mA.
• Load (Current Outputs): Max. 500 Ω.

Communication

• Fieldbus Systems: PROFIBUS DP (Profile 3.02), Modbus TCP or RS485, PROFINET, EtherNet/IP.
• Configuration: Via Ethernet, HART, PROFIBUS DP, Modbus RS485.
• Web Server: Provides access to configuration, measured values, diagnostics, and logbooks via standard network connections.
• Protocol Specific Data: Detailed specifications for PROFIBUS DP, Modbus RS485, Modbus TCP, EtherNet/IP, and PROFINET are provided, including data transmission rates, signal encoding, and supported features.

Electrical Specification

• Supply Voltage: 100 to 120 V AC / 200 to 240 V AC, 50 or 60 Hz.
• Power Consumption: 180 VA.

Mechanical Construction

• Dimensions: See diagrams for closed version, open version, and with base.
• Materials:
  • Parts not in contact with medium: ASA + PC, PP, Safety glass (coated)
  • Parts in contact with medium: ETFE, FKM, PP, PCTFE, PTFE, FFKM.
• Hose Entries: 4 x bores for M32.
• Cable Entries: Various bores for M16, M20, NPT, and G fittings.

Environment

• Ambient Temperature Range: +5 to +40 °C (41 to 104 °F)
• Storage Temperature: –20 to 60 °C (–4 to 140 °F)
• Relative Humidity: 10 to 95 %, non-condensing
• Degree of Protection: IP55 (cabinet, analyzer stand), TYPE 3R (cabinet).
• Electromagnetic Compatibility: As per EN 61326-1, class A for industrial areas.

Process

• Sample Temperature: 4 to 40 °C (39 to 104 °F)
• Consistency of the Sample: Low solids content, aqueous, homogenized.
• Sample Supply: Unpressurized (without Y strainer). For Y strainer: Permitted pressure range max. 4 bar (58.01 psi), ensure sufficient flow.

Operability

• Operation Concept: Intuitive operation with navigator and soft keys, plain-text display.
• Display: Graphic display with resolution 240 x 160 pixels, backlight, and red background for alarms.
• Remote Operation: Supported via HART, PROFIBUS DP, Modbus RS485, and Ethernet (web server/Modbus TCP/PROFINET/Ethernet/IP).

Language Packages

Multiple languages are available, including English, German, Chinese (Simplified, PR China), and others.

Certificates and Approvals

Current certificates and approvals are available on the Endress+Hauser website.

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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