- Instrument Type(s): Nephelometer (turbidity)/Colorimeter (chlorine)/Colorimeter (color)
- Standards: EPA 180.1 (turbidity)/Adapted from Standard Methods 4500-Cl-G (chlorine)/Adapted from Standard Methods 2120 B (color)
- Nephelometer/Turbidity Units of Measure: NTU (Nephelometric Turbidity Units); ASBC (American Society of Brewing Chemists); EBC (European Brewery Convention)
- EBC (European Brewery Convention)
- Colorimeter/Color Units of Measure: Platinum Cobalt Color Units (cu)
- Colorimeter/Chlorine Units of Measure: Parts Per Million (ppm); Milligrams Per Liter (mg/L)
- Nephelometer/Turbidity Range: Turbidity: 0-4000 NTU, 0-4000 FNU, 0-10,500 ASBC, 0-150 EBC
- Colorimeter/Color Range: 0–1000 cu
- Colorimeter/Chlorine Range: 0.00–10.00 ppm free and total chlorine
- Range Selection: Automatic (all measurements)
- Nephelometer/Turbidity Accuracy: From 0-2.5 NTU the accuracy is +/- 0.05 NTU; From 2.5-100 NTU the accuracy is +/- 2%; Above 100 NTU the accuracy is +/- 3%
- Colorimeter/Color Accuracy: +/- 15 cu
- Colorimeter/Chlorine Accuracy (Tablet): 0-1.0 ppm Range: +/- 0.03 ppm; 1.0-3.0 ppm Range: +/- 0.06 ppm; 3.0-6.0 ppm Range: +/- 0.3 ppm; 6.0-10.0 ppm Range: +/- 2.5 ppm
- Colorimeter/Chlorine Accuracy (Liquid): 0-0.5 ppm Range: +/- 0.03 ppm; 0.6-3.0 ppm Range: +/- 0.06 ppm; 3.0-8.0 ppm Range: +/- 0.4 ppm; 8.0-10.0 ppm Range: +/- 1.5 ppm
- Nephelometer/Turbidity Detection Limit: 0.05 NTU
- Colorimeter/Color Detection Limit: 20 cu
- Colorimeter/Chlorine Detection Limit: 0.03 ppm
- Nephelometer/Turbidity Light Source: Tungsten lamp 2300 deg. C +/- 50 deg. C
- Colorimeter/Color Light Source: 428 +/- 2 nm UV LED
- Colorimeter/Chlorine Light Source: 525 +/- 2 nm LED
- Nephelometer/Turbidity Detector: Photodiode, centered at 90 deg., maximum peak 400-600 nm
- Colorimeter/Color Detector: Photodiode
- Colorimeter/Chlorine Detector: Photodiode
- Response Time: < 2 seconds
- Signal Averaging: Turbidity
- Sample Chamber: Accepts 25 mm fl at-bottomed test tubes
- Sample: 10 mL in capped tube
- Display: Graphic Liquid Crystal Display (LCD)
- Software: Auto Shut-off at 5 min./10 min./30 min./disabled; Calibration is field-adjustable/blank/1 point; data Logging up to 500 points
- Languages: English, Spanish, French, Portuguese, Italian, Chinese, Japanese (Kana)
- Temperature: Operation: 0–50 deg. C; Storage: -40–60 deg. C
- Operation Humidity Range: 0–90 % RH, non-condensing
- Auto Shut-off: 5 min./10 min./30 min./disabled
- Power Source†: USB wall adapter, USB computer connection or lithium ion rechargeable battery 2200 mAH, 3.7V
- Battery Life: Approximately 380 tests with backlight on; up to 1000 tests with backlight off (w/signal averaging disabled)
- Total Battery Life: Approximately 500 charges
- Electrical Ratings: Provided on nameplate label
- Dimensions: 8.84 cm x 19.05 cm x 6.35 cm; 3.5 in. x 7.5 in. x 2.2 in.
- Weight: 362 g, 13 oz (meter only)
- USB Interface: mini B
The LaMotte LTC3000we portable, microprocessor-controlled, direct-reading nephelometer (turbidity meter) measures turbidity directly; its measurements meet or exceed EPA design specifications for NPDWR and NPDES turbidity monitoring programs, as specified by the USEPA method 180.1. It has a graphical liquid crystal display and six-button keypad. These allow the user to select options from the menu driven software, to directly read test results, or to review previous test results stored in the data logger. Menus can be displayed in seven different languages.
The LTC3000we uses a state-of-the-art, multi-detector, optical configuration assuring long-term calibration stability, high precision and accuracy, and low detection limits. All LTC3000we readings are determined by its sophisticated digital signal processing algorithms, minimizing readings fluctuations, and enabling rapid, repeatable measurements. The microprocessor and optics enable a dynamic range, as well as auto-ranging over several ranges. EPA turbidity uses a tungsten filament light source designed for a uniform light spot image and stable output.The LTC3000we is powered by USB wall adapter, USB computer connection, and/or lithium battery. A USB port on the back of the meter allows it to interface with a Windows-based computer for real-time data acquisition and data storage (via PC).
The LTC3000we may be interfaced with any Windows-based computer by using the LaMotte SMARTLink 3 Program.
The LTC3000we colorimeter uses EPA approved DPD reagents to measure their reaction with chlorine. In the absence of iodide, free available chlorine reacts instantly with DPD to produce a pink color. Subsequent addition of potassium iodide (DPD 3) causes a reaction with the combined form of chlorine. The LTC3000we electronically measures the color produced in these reactions in comparison to a colorless water sample. Using the EPA approved wavelength of 525 nm, the device first it measures the intensity of a light beam passing through a clear, colorless sample (the "blank"); then it measures the intensity of light passing through the pink "reacted" sample. The LTC3000we then uses the ratio of these two measurements to calculate the concentration of chlorine to displays its results.
The LTC3000we spectrophotometer (colorimeter) is calibrated with APHA color standards at 428 nm. The meter electronically measures color in comparison to a colorless water sample. First, it measures the intensity of a light beam passing through a clear, colorless sample (the "blank"). Then it measures the intensity of light passing through the colored sample. The LTC3000we uses the ratio of these two measurements to calculate the color, and displays its results. The results are expressed in APHA color units (cu).
There is no standard wavelength for measuring color, and it is common for meters to use different wavelengths. Since chloroplatinate/cobalt standards will have different absorbance values at various wavelengths, comparing results from the LTC3000we to any meter using an alternative wavelength (other than 428 nm), will produce invalid results.