Tiếng Việt
Online, automatic monitoring of critical process parameters and process efficiency in anaerobic digesters
A new control alternative for anaerobic digestion
Due to the expensive or time-consuming character of most analysis methods for anaerobic processes, industrial digesters are usually not adequately monitored. Developed specifically for monitoring anaerobic digesters, the EZ7200 Series bring the possibility of implementing new control alternatives to typical operating problems in mid to large scale digesters.
Critical parameter monitoring, online and automatic
Anaerobic digesters require monitoring of a specific set of critical parameters in order to obtain optimal production efficiency, compliance and biogas yield. The primary parameter is volatile fatty acids (VFAs), representing the metabolic condition of the anaerobic digester and responding quickly to stress induced changes, combined with alkalinity.
The EZ7200 Series are easy-to-operate online titrators using a unique and robust method for measuring the critical process parameters in one single run, enabling insight as well as full control over the anaerobic process:
– Direct titration with minimum volatilisation
– Continuous monitoring of the anaerobic process
– Enabling higher loading rate for maximum CH4 production
– Prevention of digester failure due to VFA accumulation
– Easy implementation within a dynamic control strategy
– Easy integration into corporate networks
There are many additional options available. Please contact Hach for more details.
| Alarm | 1 x malfunctioning, 4 x user-configurable, max. 24 VDC/0.5 A, potential free contacts |
| 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. |
| Lower Limit of Detection (LOD) | ≤ 10 mg/L |
| Material | Hinged part: Thermoform ABS, door: PMMA Wall section: Galvanized steel, powder coated |
| Measurement Method | Acid-base titration |
| Method Name | Titrimetric |
| Number of sample streams | 1, 2, or 4 |
| Parameter | Volatile fatty acids (VFAs), total alkalinity |
| Power | 100 – 240 VAC, 50/60 Hz Max. power consumption: 120 VA |
| Precision | Better than 3% full scale range for standard test solutions |
| Protection Class | Analyzer cabinet: IP44 / Panel PC: IP65 |
| Range | VFAs 10 – 500 mg/L as acetate equivalent; Alkalinity, total and Alkalinity, partial: 50 – 2500 mg/L as CaCO₃ |
| Range | VFA: 10‐500 mg/L , TA: 50-2500 mg/L |
| Reagent Requirements | Keep between 10 – 30 °C (50 – 86 °F) |
| Rinsing | With tap water |
| Sample Flow Rate | 100 – 300 mL/min |
| Sample Pressure | By external overflow vessel |
| Sample Quality | Maximum particle size 500 µm, < 0.1 g/L Most applications require the use of an EZ9130 sampling/filtration system. |
| Sample Temperature | 10 – 30 °C (50 – 86 °F) |
| Validation | Automatic; frequency freely programmable |
| Warranty | 12 months |
| Weight | 25 kg (55 lbs.) |
| What’s included? | EZ7250 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 10L Reagent Containers with Fittings (H₂SO₄ & NaOH Solution) |
