Hach, EZ7251.XXXXXXXX, EZ7251 Volatile Fatty Acids (VFA) & Alkalinity Analyzer
Catalog Number: EZ7251.XXXXXXXX
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| Alarm | 1 x malfunctioning, 4 x user-configurable, max. 24 VDC/0.5 A, potential free contacts |
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| Ambient Temperature | 10 - 30 °C ± 4 °C deviation (50 - 86 °F ± 7.2 °F deviation) at 5 - 95% relative humidity (non-condensing) |
| Analog Outputs | Active 4 - 20 mA max. 500 Ohm load, standard 1, max. 8 (option) |
| Automatic cleaning | Yes |
| Calibration | Automatic; frequency freely programmable |
| Certifications | CE compliant / ETL certified |
| Cycle Time | 10 - 15 minutes |
| Demineralized Water | N.A. |
| Digital Outputs | Optional: Modbus (TCP/IP, RS485) |
| Dimensions (H x W x D) | 690 mm x 465 mm x 330 mm |
| Drain | Atmospheric pressure, vented, min. Ø 64 mm |
| Earth Connection | Dry and clean earth pole with low impedance (< 1 Ohm) using an earth cable of > 2.5 mm² |
| Instrument Air | Dry and oil free according to ISA-S7.0.01-1996 quality standard for instrument air |
| Interferences | Phosphates and similar dissociating ions and non-fatty acids which on acidification from undissociated acids may cause interference. Sulphide may deteriorate some types of pH electrodes. Fats, oil, proteins, surfactants and tar. |
Unless otherwise stated, the minimum order amount is USD 1,000.
For orders below USD 1,000, an additional handling fee may apply, or we may arrange local delivery / local handover where available.
All quotations are subject to final confirmation, including product availability, lead time, batch information, shipping cost, and applicable export or handling requirements.
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| Lower Limit of Detection (LOD) | ≤ 10 mg/L |
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| Material | Hinged part: Thermoform ABS, door: PMMA Wall section: Galvanized steel, powder coated |
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| Measurement Method | Acid-base titration |
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| Method Name | Titrimetric |
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| Number of sample streams | 1, 2, or 4 |
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| Parameter | Volatile fatty acids (VFAs), total alkalinity |
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| Power | 100 - 240 VAC, 50/60 Hz Max. power consumption: 120 VA |
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| Precision | Better than 3% full scale range for standard test solutions |
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| Protection Class | Analyzer cabinet: IP44 / Panel PC: IP65 |
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| Range | VFAs 20 - 1000 mg/L as acetate equivalent; Alkalinity, total and Alkalinity, partial 50 - 2500 mg/L as CaCO₃ |
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| Range | VFA: 20‐1000 mg/L, TA: 50-2500 mg/L |
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| Reagent Requirements | Keep between 10 - 30 °C (50 - 86 °F) |
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| Rinsing | With tap water |
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| Sample Flow Rate | 100 - 300 mL/min |
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| Sample Pressure | By external overflow vessel |
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| Sample Quality | Maximum particle size 500 µm, < 0.1 g/L Most applications require the use of an EZ9130 sampling/filtration system. |
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| Sample Temperature | 10 - 30 °C (50 - 86 °F) |
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| Validation | Automatic; frequency freely programmable |
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| Warranty | 12 months |
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| Weight | 25 kg (55 lbs.) |
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| What's included? | EZ7251 VFA & Alkalinity Analyzer, Instruction Manual, 1 x Double Bit Door Key, 1 x Mounting Brackets, 1 x pH Electrode, Routine S7 Connection, 1 x empty 2.5L Reagent Container with Fittings (Anti-foam Solution) and 2 x empty Reagent Containers with Fittings (H₂SO₄ & NaOH Solution) |
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