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The HI 93414 measures the most important parameters of drinking water: turbidity and free/total chlorine. Designed for water quality measurements, HI 93414 provides reliable and accurate readings on low turbidity and chlorine values. The HI 93414 meets and exceeds the requirements of USEPA and Standard Methods both for turbidity and colorimetric measurements.
This instrument incorporates an optical system which guarantees accurate results. The optical system, consisting of a tungsten filament lamp, three detectors (scattered, transmitted for turbidimeter range and one for colorimeter range), and a narrow band interference filter @ 525 nm assures long term stability and minimizes stray light and color interferences. It also compensates for variations in intensity of the lamp, making no need for frequent calibration. The 25 mm round cuvettes made from special optical glass guarantee repeatability and consistency of measurements.
Turbidity measurements can be made in the 0.00 to 1000 NTU (Nephelometric Turbidity Units) range. The instrument has an EPA compliance reading mode which rounds readings to meet EPA reporting requirements. Depending on the measured sample and needed accuracy, normal measurement, continuous measurement or signal averaging measurement can be selected. Free or total chlorine measurements can be made in the 0.00 to 5.00 mg/L (ppm) range.
At startup, the meter displays the percentage of remaining battery life and, if too low, a 'low battery' warning message is displayed.
With the powerful CAL CHECK™ function, performance of the instrument can be validated at any time by using the exclusive HANNA ready-made NIST traceable standards. Calibration can be performed at any time for turbidity and colorimetric range. For turbidity, a two, three or four-point calibration is available using supplied (<0.1, 15, 100 and 750 NTU adjustable calibration points) or user prepared standards. For colorimeter measurements, a one-point calibration can be performed.
Turbidity of water is an optical property that causes light to be scattered rather than transmitted. The scattering of light that passes through a liquid is primarily caused by suspended solids. Higher turbidity means greater amounts of scattered light. No solution will have zero turbidity because even the molecules in a very pure fluid scatter light to a certain degree. The USEPA Method 180.1 specifies the key parameters for optical systems to measure drinking, saline and surface water turbidity in a 0 to 40 NTU range, using the nephelometric method.
The light beam that passes through a sample is scattered in all directions. The intensity and pattern of the scattered light is affected by many variables like wavelength of the incident light, particle size, shape, refractive index and color. The microprocessor of the instrument performs calculations using the signal that reaches the two detectors to display the NTU value. The optical system and measuring technique allow the compensation of lamp intensity fluctuations, minimizing the need of frequent calibration. The lower detection limit of a turbidimeter is determined by the so called “stray light”. Stray light is the light detected by the sensors that is not caused by light scattering from suspended particles. The optical system of these instruments is designed to have very low stray light, providing accurate results for low turbidity samples every time.
|CAL CHECK™ Calibration Validation|
When performing chlorine measurements, you need to know that the instrument you are using is right on. With HANNA’s exclusive CAL CHECK™ feature you can now rest assured. Simply insert the factory calibrated standard of a known concentration and verify that your instrument is accurate.
With HANNA’s exclusive CAL CHECK™ validation function users are able to verify the performance of the instrument at any time. Taking just a few short steps, the validation procedure is user friendly and ensures that the meter is properly calibrated. Just use the exclusive HANNA ready-made, NiST traceable standards to verify the performance of the instrument and recalibrate if necessary. All instruments are factory calibrated and the electronic and optical design minimizes the need for frequent calibration.
|Turbidity (HI 93414 & HI 98703)|
|Range||0.00 to 9.99; 10.0 to 99.9 and 100 to 1000 NTU|
|Resolution||0.01 NTU from 0.00 to 9.99 NTU; 0.1 NTU from 10.0 to 99.9 NTU;
1 NTU from 100 to 1000 NTU
|Accuracy||±2% of reading plus 0.02 NTU|
|Repeatability||±1% of reading or 0.02 NTU, whichever is greater|
|Stray Light||< 0.02 NTU|
|Typical EMC Deviation||±0.05 NTU|
|Light Detector||Silicon Photocell|
|Method||Ratio Nephelometric Method (90°), ratio of scattered and transmitted light;
Adaptation of the USEPA Method 180.1 and Standard Method 2130 B.
|Measuring mode||Normal, Average, Continuous|
|Turbidity Standards||1, 10, 100 and 750 NTU|
|Calibration||Two, three or four-point calibration|
|Free and Total Chlorine (HI 93414 only)|
|Range||Free Cl2 0.00 to 5.00 mg/L; Total Cl2 0.00 to 5.00 mg/L|
|Resolution||0.01 mg/L from 0.00 to 3.50 mg/L; 0.10 above 3.50 mg/L|
|Accuracy||±0.02 mg/L @ 1.00 mg/L|
|Typical EMC Deviation||±0.02 mg/L|
|Detector||Silicon photocell with 525 nm narrow band interference filters|
|Method||Adaptation of the USEPA Method 330.5 and Standard Method 4500-
Cl G. The reaction between chlorine and DPD reagent causes a pink
tint in the sample
|Standards||1 mg/L free chlorine, 1 mg/L total chlorine|
|Light Source||Tungsten filament lamp|
|Lamp life||Greater than 100,000 readings|
|Display||60 x 90 mm LCD with back light|
|LOG Memory||200 records|
|Serial Interface||USB 1.1 or RS 232|
|Environment||To 50°C (122°F); max 95% RH non-condensing|
|Power Supply||(4) 1.5V AA alkaline batteries or AC adapter|
|Auto-off||After 15 minutes of non-use|
|Dimensions||224 x 87 x 77 mm (8.8 x 3.4 x 3.0”)|
|Weight||512 g (18 oz.)|
|HI 710005 Voltage adapter||HI 92000 Windows® compatible software|
|HI 731318 Tissue for wiping cuvets (4 pcs)||HI 920005 5 tag holders with tags|
|HI 731331 Glass cuvets (4 pcs)||HI 920011 5 to 9 pin RS232 connection cable|
|HI 740027P 1.5V AA battery (12 pcs)||HI 93703-50 Cuvet cleaning solution (230 mL)|
1 - Five sample cuvets and caps
* HI93414 only