THM 1100

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SKU485331


The YSI THM 1100 provides automated, continuous monitoring of trihalomethanes (THMs) to help protect drinking water quality and support regulatory compliance. The complete system includes the analyzer, water connection kit, gas connection kit, grab sample kit, and calibration kit.

  • Overview

    The YSI THM 1100 is a fully automated purge-and-trap gas chromatograph designed to measure individual and total trihalomethane concentrations at low parts-per-billion (ppb) levels without the use of chemical reagents.

    The analyzer measures four regulated THM compounds and delivers results in less than 30 minutes, providing water treatment operators with timely insight into changing water quality conditions. This enables proactive treatment adjustments to help manage the formation of trihalomethanes, a regulated class of disinfection by-products (DBPs).

    Reliable THM Process Control - Continuously monitor trihalomethane (THM) levels to identify changing water conditions, optimize disinfection, and better manage disinfection by-product (DBP) formation.

    Accurate TTHM Measurement - Achieve precise, low-ppb THM measurement with built-in calibration and validation routines designed to support reliable individual and total trihalomethane results.

    Reagentless, Cost-Effective Operation -The reagentless THM analyzer reduces consumable costs, maintenance requirements, and operational complexity for cost-effective drinking water monitoring.

    Easy Installation and Low Maintenance - Install the THM 1100 in under an hour and simplify operation with an intuitive interface. Minimal routine maintenance helps reduce operator workload and analyzer downtime.

    Factory Calibrated - Factory calibrated for a 0–320 ppb TTHM measurement range and up to 80 ppb for each individual trihalomethane compound.

    Primary Applications

    • Minimize disinfection by-product (DBP) formation and support regulatory compliance in municipal drinking water
    • Optimize chlorine disinfection and treatment processes
    • Monitor and control potable water reuse treatment processes

    Secondary Applications

    • Monitor storage tanks and drinking water distribution systems
    • Monitor industrial and process water applications

  • Specifications
    THM 1100 Specifications  
    Performance
    Operating Principle Purge & Trap/Gas Chromatograph
    Measurement Technique Surface Acoustic Wave Detector
    Regulatory Method Compliance Comparable to USEPA Method 524.4 and ISO 10301
    Measurement Range 0 to 320 ppb TTHM; 80-ppb each THM compound
    Accuracy ±10% TTHM standard factory calibration
    Precision 5% Relative Standard Deviation (RSD)
    Limit of Detection 1 ppb each compound
    Sample Processing Under 25 minutes with 60 minutes minimum between cycles
    General
    Operator Interface 2 x 20 backlit LCD with membrane touchpad
    External Dimensions (Enclosure) 25in H x 20in W x 11in D (62.2cm H x 50.8cm W x 28.2cm D)
    Mounting Dimensions (Water/Grab Sample) 35in H x 26in x 11in D (89cm H x 66cm W x 28.2cm 
    Certifications IEC 61326-1, IEC 61010-1, cETLus (ETL and CSA Standards)
    Instrument Enclosure Certifications IP54; NEMA 4
    Weight 18.2 kg (<40>
    Instrument Warranty 2 years
    Sample and Gas Requirements
    Sample Inlet Pressure 30 – 40 psi (2.1 – 2.8 bar)
    Gas Requirements Nitrogen (UHP, 99.99%); 40 – 45 psi (2.8 – 3.1 bar)
    Power and Communication
    Power Requirements 115 to 230 VAC, 150VA, 50/60 Hz; Fluctuation, ±10%; Over-voltage, Category II
    Input Relays 2 (remote start/remote stop); 0.5A/200 VDC Max – potential free contact closure
    Output Relays 3 (automatic/local mode, ready, error); 5A/30 VDC Max – potential free contact closure
    Analog Outputs 5 (4 to 20 mA; one for each compound and TTHM)
    Digital Outputs RS-485/422 Modbus RTU protocol or ASCII standard
    Data Export To PC via USB memory stick (Microsoft® Excel®-ready .csv file format)
    Environmental
    Operating Temperature Range 41 to 104 °F (5 to 40 °C)
    Humidity Up to 90% humidity (non-condensing)

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