A multi-detector optical configuration assures long term stability and minimizes stray light and color interferences. All readings are determined by the process of signal averaging over a 5 second period. This minimizes fluctuations in readings attributed to large particles and results in rapid, highly repeatable measurements.

FEATURES
Field & Lab Use - Supplied with a 9 volt alkaline battery
and an AC power adapter (Order Code 1773) - the 2020 is an ideal choice for regulatory monitoring, process water
testing, and environmental water analysis in the field or
laboratory.
EPA Compliant - This nephelometric turbidity instrument
meets or exceeds EPA design specifications for NPDWR
and NPDES turbidity monitoring programs as specified by USEPA method 180.1. There is also an EPA compliance
reading mode which rounds the reading to meet EPA
reporting requirements.
Micro Processor Based - RANGE: 0 to 1100 NTUs.
The microprocessor enables auto-ranging over the full range of 0 to 1100 nephelometric turbidity units (NTUs) and provides direct digital readout with a resolution of 0.01 for the lowest range with an accuracy of ±2%.
Easy to Operate & Calibrate - The simple calibration
procedure involves activating the t or s keys until the reading matches the standard. The microprocessor adjusts the factory programmed calibration curve accordingly. Two primary turbidity standards are provided.
European CE Mark - The 2020 has been independently
tested and has earned the European CE Mark of compliance for electromagnetic compatibility and safety.
RS-232 Interface - An RS-232 port is provided to
interface with a datalogger or computer. Optional cable
available, Order Code 1772.
A Great Value - Attractively priced, the 2020 Portable
Turbidity Meter comes with AC adapter, four optically
selected sample vials with screw caps, standardization
package consisting of 1.0 NTU (Order Code 1476) and
10.0 NTU (Order Code 1477) AMCOTM standards, and an illustrated instruction manual, all in a sturdy carrying case.

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PRINCIPLE OF OPERATION
The 2100P Turbidimeter features a unique optical design that incorporates signal ratioing. Light is focused into a narrow beam and passed through the sample. The 90° scatter detector receives light scattered by particles in the sample. The transmitted light detector receives light that passes through the sample. The signal output of the 2100P is a ratio (based on an algorithm) of the two detectors. By measuring both 90° scattered light and transmitted light, the 2100P compensates for background color, light fluctuations or dust and haze on the optics. Electronically conditioning these signals results in excellent linearity, color rejection and calibration stability.

Signal averaging – The 2100P also features a selectable
signal averaging mode, which compensates for fluctuations in readings caused by large particles drifting through the light path. Signal averaging eliminates the noise by averaging multiple readings over a period of time and displaying the averaged signal.
Calibration and standardization – Calibration of the
2100P Portable Turbidimeter is based on formazin, the
accepted primary standard for turbidity measurement. For
convenient routine verification, Hach supplies Gelex (R)
Secondary Standards (metal oxide particles locked in gel)
formulated to simulate formazin. When checked periodically against formazin, these secondary standards are a simple and accurate means of checking instrument calibration.
Built-in diagnostics – The diagnostic mode is accessible
with one key stroke. This mode allows the operator to
obtain information about operating parameters that can help evaluate instrument functions. The 2100P Portable
Turbidimeter is supplied with all necessary testing apparatus, an instrument/procedure manual and a durable carrying case.
Electronic zero – When the READ key is pressed, the
2100P Portable Turbidimeter automatically zeros the
instrument, compensating for stray light and electronic and optical offsets. No manual adjustment is required.
FEATURES AND BENEFITS
Calculations eliminated – The 2100P Turbidimeter
provides direct digital readout in nephelometric turbidity units (NTUs), completely eliminating the need for calculations or interpolation of calibration charts.
Greater sensitivity – With a measurement range of 0 to
1000 NTU and resolution to 0.01 NTU, the 2100P is ideal for regulatory monitoring, process control or field studies. Choose one of three manual range modes (0 to 9.99, 0 to 99.9 and 0 to 1000 NTU) or automatic range mode for measuring samples that vary widely in turbidity.
Outstanding field performance – The light-weight 2100P Portable Turbidimeter comes field ready with four AA alkaline batteries (optional battery eliminator available), all necessary apparatus, and a rugged carrying case. The instrument itself weighs less than 0.45 kg (1 lb). The complete analytical package (including case, apparatus and instructions) weighs just under 2.73 kg (7 lbs).
Minimal training required – Because the 2100P Portable Turbidimeter is so easy to use, personnel can get accurate results even with little training. Each instrument is supplied with a complete instruction manual to guide you step by step through calibration, testing and maintenance procedures. Also included is information on sampling and measuring technique, and a quick reference card to save time during daily operation.

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STANDARD FEATURES
Rugged Portable Carrying Case - Ensures durability and convenience no matter where your laboratory happens to be.
Completely Self-Contained - Provides easy access to
everything you need to take a measurement.
Three User Selectable Ranges - Provides accuracy in a
wide variety of applications from 0 to 1000 NTU.
20 Hour Rechargeable Battery - Always be ready to go with up to 20 hours of continuous operation when fully
charged.

OPTIONAL FEATURES
Automobile Adapter - Charge and operate the DRT 15CE from the cigarette lighter in your automobile.
Formazin Stock Solution Kit - Contains everything you
need to calibrate the DRT-15CE with Formazin, the primary calibration standard.

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