CA76NA

Summary

Product identification

• Product name: CA76NA Analyzer for sodium
• Document title: TI01339C/07/EN/04.22-00
• Product code: 71577533
• Revision date: 2022-06-30

Application

The CA76NA analyzer is designed for monitoring:

• Water/steam circuits in power stations
• Condensate for system rupture indications
• Demineralization systems
• Steam purity
• Cation and mixed bed exchangers

Measuring principle

The analyzer operates on a potentiometric principle using ion-selective glass electrodes to measure the concentration of dissolved sodium ions (Na⁺). A pH electrode is used as a reference and to measure pH. The sample is alkalized to a pH of 11.00 using a reagent like diisopropylamine (DIPA) to ensure accurate measurement of low sodium concentrations. The sensitivity to interference ions follows the order: Ag⁺ >> H⁺ >> Na⁺ > >Li⁺ > K⁺.

Equipment architecture

The analyzer supports up to 6 sampling channels and can have an additional connection for a laboratory sample.

Power supply

• Supply voltage: 100 to 240 V AC, 50/60 Hz
• Fuse: T 1.25 A for 215 to 240 V AC; T 2.5 A for 100 to 130 V AC (supplied).
• Power consumption: 40 VA

Output signals

• Analog outputs: Up to 6 x 4 to 20 mA
• Load for analog output: Max. 500 Ω
• Digital outputs:
  • Relay 1: Alarms (changeover contact)
  • Relay 2: Warnings (changeover contact)

Relay switching capacity

PROFIBUS DP (Optional)

• Signal encoding: EIA/TIA-485, PROFIBUS DP-compliant acc. to IEC 61158
• Data transmission rate: 9.6 kbit/s – 12 Mbit/s
• Connectors: M12 socket (5-pin, b-coded)
• Manufacturer ID: 11h
• Device type: 1571Dh

Performance characteristics

Response time

• **CA76NA-**AD (0.1 to 2000 µg/l): 180 seconds (95%) within a 72-hour calibration interval.
• **CA76NA-**AD (2001 to 9999 µg/l): 600 seconds (95%) within a 72-hour calibration interval.
• **CA76NA-**AE: < 55 s

Maximum measured error

• **CA76NA-**AD (0.1 to 2000 µg/l): 2% of measured value; ±2 µg/l (under reference conditions).
• **CA76NA-**AD (2001 to 9999 µg/l): 5% of measured value; ±5 µg/l (under reference conditions).
• **CA76NA-**AE (0.1 to 40 µg/l): 2 µg/l.
• **CA76NA-**AE (> 40 µg/l): 5% of measured value.

Repeatability

• **CA76NA-**AD (0.1 to 2000 µg/l): ±2% of display value; ±2 µg/l (under reference conditions).
• **CA76NA-**AD (2001 to 9999 µg/l): ±5% of display value; ±5 µg/l (under reference conditions).
• **CA76NA-**AE: Max. ±4% of measured value or ±1 µg/l (under reference conditions, for the same sample matrix).

Reagent consumption

• **CA76NA-**AD: Typically 0.5 l per month at 25 °C.
• **CA76NA-**AE: Maximum 0.2 l per day at < 30 °C and alkalization to pH 11.

Sample conditioning

• **CA76NA-**AD: Sample pH 3.5 to 11 (unbuffered).
• **CA76NA-**AE: Sample pH 2 to 4 (alkalinity: based on pH 2 acidified with HCl and buffered with 225 ppm CaCO₃).

Environment

• Ambient temperature range: 5 to 45 °C (41 to 113 °F).
• Storage temperature: 0 to 50 °C (32 to 122 °F).
• Humidity: 30 to 95 %.
• Degree of protection: IP54 (complete panel assembly), IP65 (electronics unit).
• Electromagnetic compatibility: Interference emission and interference immunity as per EN 61326-1:2013, Class A for Industry.
• Electrical safety: According to EN/IEC 61010-1:2010, Class I equipment, overvoltage category II.
• Pollution degree: 2 (overall), 1 (within electronics unit).

Process

• Sample temperature range: +10 to +40 °C (+50 to +104 °F).
• Supply pressure: 1.0 to 5.0 bar (14.5 to 72.5 psi).
• Sample flow rate: 10 to 15 l/h (2.64 to 3.96 gal/hr).
• Sample supply: Includes pressure regulator (approx. 0.8 bar), additional lab sample input, and pH regulation to pH 11.

Mechanical construction

• Dimensions: See diagrams in the original document.
• Weight: Approx. 23 kg (50.7 lbs).
• Hose specification:
  • Medium inlet: 6 mm outer diameter PE or PTFE hose.
  • Medium outlet: Various sizes including 6x4 mm, 11x8 mm, and 8x6 mm.

Scope of delivery

• 1 analyzer
• 1 print version of the Brief Operating Instructions in the ordered language.

Note: Sodium electrode, pH electrode, standard solution, and alkalization reagent are not included and must be ordered separately.

Accessories

• Starter kit: Includes pH electrode, sodium electrode, and standard solution.
• Electrode kit: Includes sodium electrode and pH electrode.
• PROFIBUS upgrade kit: For analyzers with software version V2.13 or higher.
• Consumables: Alkalization reagent (recommended: diisopropylamine (DIPA), > 99.0 % (GC)), Sodium standard solution (5100 µg/l Na, 500 ml).

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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