Hanna Instruments HI 95715 User Manual

Instruction Manual

HI 95715

Ammonia Medium Range ISM

www.hannainst.com

This Instrument is in

Compliance with the CE Directives

Dear Customer, Thank you for choosing a Hanna product. This manual will provide you with the necessary

information for the correct use of the instrument. Please read it carefully before using the meter. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.

This instrument is in compliance with

directives.

TABLE OF CONTENTS

PRELIMINARY EXAMINATION ..............................................................................................3

GENERAL DESCRIPTION ......................................................................................................4

ABBREVIATIONS ................................................................................................................4

SPECIFICATIONS ................................................................................................................5

PRECISION AND ACCURACY.................................................................................................5

PRINCIPLE OF OPERATION..................................................................................................6

FUNCTIONAL DESCRIPTION.................................................................................................7

GUIDE TO DISPLAY CODES..................................................................................................9

GENERAL TIPS FOR AN ACCURATE MEASUREMENT.............................................................11

MEASUREMENT PROCEDURE ............................................................................................13

VALIDATION PROCEDURE..................................................................................................15

CALIBRATION PROCEDURE................................................................................................16

BATTERY REPLACEMENT ...................................................................................................18

ACCESSORIES .................................................................................................................18

CE DECLARATION OF CONFORMITY....................................................................................19

WARRANTY .................................................................................................................19

All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode Island, 02895 , USA.

PRELIMINARY EXAMINATION

Please examine this product carefully. Make sure that the instrument is not damaged. If any damage occurred during shipment, please notify your Dealer.

Each HI 95715 Ion Selective Meter is supplied complete with:

• Two Sample Cuvets and Caps

• 9V Battery

• Tissue for wiping cuvets

• Instruction Manual and Quick Reference Guide

• Instrument Quality Certificate

• Rigid carrying case

Note:save all packing material until you are sure that the instrument works correctly.

Any defective item must be returned in its original packing.

GENERAL DESCRIPTION

The HI 95715 is an auto diagnostic portable microprocessor meter that benefits from Hanna’s years of experience as a manufacturer of analytical instruments. It has the advanced optical system based on a LED light source and a narrow band interference filter that allows most accurate and repeatable readings. All instruments are factory calibrated and the electronic and optical design minimizes the need of frequent calibration.

With the powerful CAL CHECK validation function you are able to validate good performance of your instrument at any time. The validation procedure is extremely user friendly. Just use the exclusive Hanna ready-made, NIST traceable standards to verify the performance of the instrument and recalibrate if necessary.

All instruments are splash proof and the LED (Light Emitting Diode) and filter units are protected from dust or dirt by a transparent cup. This makes the instruments fulfill field applications. Display codes aid the user in routine operation. The meter has an auto-shut off feature that will turn off the instrument after 10 minutes of non use or after 1 hour if left in the calibration mode.

The meter uses an exclusive positive-locking system to ensure that the cuvet is in the same position every time it is placed into the measurement cell. It is designed to fit a cuvet with a larger neck making it easier to add both sample and reagents. The cuvet is made from special optical glass to obtain best results.

The HI 95715 meter measures the ammonia nitrogen (NH

0.00 to 9.99 mg/L (ppm) range. The method is an adaptation from ASTM Manual of Water and Environmental Technology, D1426-93, Nessler Method.

The reagents are in liquid form and are supplied in bottles. The amount of reagent is precisely dosed to ensure the maximum repeatability.

-N) content in water samples in the

ABBREVIATIONS

American Society for Testing and Materials

ASTM:

degree Celsius

°C:

degree Fahrenheit

°F:

Liquid Crystal Display

LCD:

Light Emitting Diode

LED:

milligrams per liter. mg/L is equivalent to ppm (part per million)

mg/L:

milliliter

mL:

SPECIFICATIONS

Range 0.00 to 9.99 mg/L Resolution 0.01 mg/L for measurement

0.1 mg/L for calibration and validation

Precision ±0.12 mg/L @ 6.00 mg/L Typical EMC Deviation ±0.01 mg/L Light Source Light Emitting Diode with narrow band interference filter @ 466 nm Light Detector Silicon Photocell Method Adaptation of the ASTM Manual of Water and Environmental Technology,

D1426-93, Nessler Method. The reaction between ammonia and the reagents causes a yellow tint in the sample.

Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing Battery Type 1 x 9 volt Auto-Shut off After 10' of non-use in measurement mode;

after 1 hour of non-use in calibration mode.

Dimensions 180 x 83 x 46 mm (7.1 x 3.3 x 1.8") Weight 290 g (10 oz.).

REQUIRED REAGENTS Code Description Quantity/test

HI 93715A-0 First Reagent 4 drops (6 drops in seawater) HI 93715B-0 Second Reagent 4 drops (10 drops in seawater)

(as NH3-N)

PRECISION AND ACCURACY

Precision is how closely repeated measurements agree with each other. Precision is usually expressed as standard deviation (SD).

Accuracy is defined as the nearness of a test result to the true value.

Although good precision suggests good accuracy, precise results can be inaccurate. The figure explains these definitions.

In a laboratory using a standard solution of 6.00 mg/L ammonia nitrogen (NH representative lot of reagents, an operator obtained with a single instrument a standard deviation of

0.12 mg/L.

-N) and a

PRINCIPLE OF OPERATION

Absorption of Light is a typical phenomenon of interaction between electromagnetic radiation and matter. When a light beam crosses a substance, some of the radiation may be absorbed by atoms, molecules or crystal lattices.

If pure absorption occurs, the fraction of light absorbed depends both on the optical path length through the matter and on the physical-chemical characteristics of the substance according to the Lambert-Beer Law:

-log I/I

Where:

-log I/Io= Absorbance (A)

Io= intensity of incident light beam I = intensity of light beam after absorption

ελ= molar extinction coefficient at wavelength λ

c = molar concentration of the substance d = optical path through the substance

Therefore, the concentration "c" can be calculated from the absorbance of the substance as the other factors are known.

Photometric chemical analysis is based on the possibility to develop an absorbing compound from a specific chemical reaction between sample and reagents. Given that the absorption of a compound strictly depends on the wavelength of the incident light beam, a narrow spectral bandwidth should be selected as well as a proper central wavelength to optimize measurements.

The optical system of Hanna's HI 95715 colorimeter is based on a Light Emitting Diode (LED) combined with a narrow-band interference filter to guarantee both high performance and reliable results.

= ελ c d

A = ελ c d

HI 95715 block diagram (optical layout)

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