Testomat2000 Online Photometric Water Hardness Analyzer

Overview

The Testomat2000 Online Photometric Water Hardness Analyzer is a fully integrated, TÜV-certified photometric process analyzer engineered for continuous, unattended monitoring of critical water quality parameters in industrial and municipal water treatment systems. Based on standardized colorimetric reaction principles—such as EDTA complexometric titration for hardness, DPD (N,N-diethyl-p-phenylenediamine) oxidation for free and total chlorine, and specific chromogenic assays for iron, chromium(VI), sulfite, and bromine—the instrument delivers trace-level quantification with high reproducibility and long-term stability. Its modular architecture integrates sample conditioning, reagent metering, photometric detection, and data processing within a single compact enclosure (380 × 480 × 280 mm, <10 kg), eliminating the need for external pumps, manifolds, or auxiliary controllers. Designed specifically for demanding environments—including boiler feedwater circuits, reverse osmosis (RO) pretreatment, cooling tower control, electroplating effluent monitoring, and potable water distribution—the Testomat2000 meets stringent safety and electromagnetic compatibility requirements per EN 61010-1, EN 50081-1, and EN 50082-2, and is certified by TÜV for 72-hour autonomous operation without manual intervention.

Key Features

• Integrated photometric measurement platform with dual-wavelength LED light source and silicon photodiode detector for optimized signal-to-noise ratio and drift compensation.
• Modular, tool-free reagent cartridge system enabling rapid replacement and minimizing cross-contamination risk; 500 mL reagent volume supports ≥5000 analyses per cartridge.
• Peristaltic dosing pump with ceramic piston and PTFE tubing ensures precise, low-maintenance reagent delivery and eliminates pulsation-induced measurement variance.
• Self-cleaning measurement cell option (Testomat2000 Self Clean) with programmable air/water purge cycles to prevent fouling in high-turbidity or scaling-prone applications.
• Configurable dual-point monitoring (Testomat2000 DUO) supporting independent analysis at two distinct sampling locations using different indicators or chemistries.
• Intuitive monochrome LCD interface with multilingual menu navigation (English + Chinese optional on CN variant); real-time display of measured values, alarm status, filter saturation, and system diagnostics.
• Dual programmable relay outputs for process control (e.g., dosing pump activation, valve switching) and maintenance alerts (e.g., low reagent, clogged filter, low inlet pressure).
• Flexible measurement scheduling: time-based (0–99 min intervals), flow-proportional (via pulse input from water meter), or external trigger (TTL/24 V signal).

Sample Compatibility & Compliance

The Testomat2000 is validated for use with potable water, boiler feedwater, RO permeate, cooling water, wastewater effluent, and electroplating rinse streams. All wetted components—including sample lines, reaction chamber, and reagent pathways—are constructed from chemically inert materials: PTFE, FEP, EPDM, and AISI 316L stainless steel—ensuring resistance to chlorine, oxidants, acids, and scaling ions across pH 4–10. The analyzer complies with EU Electromagnetic Compatibility Directive (2014/30/EU) and Low Voltage Directive (2014/35/EU), and its TÜV certification confirms suitability for safety-critical boiler room applications under German TA-Luft and VDI 2047 guidelines. While not inherently 21 CFR Part 11 compliant, audit-trail-ready data logging (via optional SD card module, Testomat2000 CN) supports GLP/GMP-aligned record retention when integrated with validated LIMS or SCADA platforms.

Software & Data Management

The embedded firmware supports configuration via front-panel keypad or remote serial interface (RS232). Optional SK910 analog output module provides isolated 0/4–20 mA signals traceable to NIST-calibrated reference standards. For digital integration, RS910 enables ASCII protocol communication for real-time data streaming and bidirectional command execution (e.g., start/stop analysis, recalibrate, reset alarms). The Testomat2000 CN variant includes an SD card slot supporting FAT32-formatted cards for timestamped storage of raw absorbance values, calibration logs, error codes, and maintenance events—retaining ≥12 months of operational history at default 15-minute sampling intervals. Exported CSV files are compatible with Excel, MATLAB, and industry-standard SCADA historians (e.g., Ignition, Siemens Desigo, AVEVA System Platform).

Applications

• Boiler feedwater hardness control to prevent scale formation and extend tube life in high-pressure steam generation systems.
• RO pretreatment monitoring for antiscalant dosing optimization and membrane fouling prevention.
• Swimming pool and drinking water disinfection management via simultaneous free/total chlorine verification per DIN EN ISO 7393-2.
• Electroplating wastewater compliance tracking for hexavalent chromium (Cr(VI)) at sub-ppm levels per EPA Method 7196A equivalents.
• Cooling water biocide dosing control through bromine or polyacrylamide concentration feedback.
• Pharmaceutical purified water (PW) and water-for-injection (WFI) loop surveillance for hardness excursions affecting endotoxin retention.
• Industrial steam condensate return line monitoring to detect corrosion-induced iron contamination (>0.1 mg/L threshold).

FAQ

What measurement principle does the Testomat2000 use for water hardness?

It employs standardized EDTA complexometric photometry per ISO 6059 and ASTM D1126, where calcium and magnesium ions form colored complexes with Eriochrome Black T or Calmagite indicators, quantified via absorbance at 525 nm or 620 nm.
Can the Testomat2000 operate without a continuous water supply?

No—it requires a stable inlet pressure of 0.1–3 bar and uninterrupted sample flow; however, optional flow-sensing logic allows it to suspend analysis during no-flow conditions and resume automatically upon restoration.
Is field calibration possible without laboratory-grade standards?

Yes—onboard calibration routines support single- or multi-point verification using certified reference solutions traceable to NIST or BAM; no PC or external software is required.
How often does the measurement cell require cleaning in hard-water applications?

With standard configuration, manual cleaning is recommended every 2–4 weeks; the Self Clean variant reduces this to quarterly intervals under typical boiler feedwater conditions.
Does the instrument support MODBUS RTU or TCP/IP protocols?

Not natively—but third-party protocol converters (e.g., Moxa EDS-G205) can bridge RS232 to MODBUS RTU; native Ethernet integration is available only on the Testomat3000 series.