Omega TRH-3 User guide

User’s Guide

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TRH-3

Turbidity Meter

OMEGAnet®Online Service Internet e-mail

omega.com [email protected]

Servicing North America:

U.S.A.: Omega Engineering, Inc., One Omega Drive, P.O. Box 4047

ISO 9001 Certified

Canada: 976 Bergar, Laval (Quebec), H7L 5A1 Canada

Stamford, CT 06907-0047 USA
Toll-Free: 1-800-826-6342 Tel: [phone]
FAX: [phone] e-mail: [email protected]

Toll-Free: 1-800-826-6342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

Customer Service: 1-800-622-2378/1-800-622-BEST
Engineering Service: 1-800-872-9436/1-800-USA-WHEN

Mexico TEL: [phone] FAX: [phone]
Latin America e-mail: [email protected]

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Servicing Asia:

China: 1698 Yi Shan Road, Unit 102, Min Hang District

Shanghai, China 201103 P.R.C.
Hotline: [phone] 619 0559
e-mail: [email protected]

Servicing Europe:

Benelux: Toll-Free: 0800 099 3344 TEL: [phone]

Czech Republic: Frystatska 184, 733 01 Karviná, Czech Republic

France: Toll-Free: 0805 466 342 TEL: [phone]

Germany/ Austria: Daimlerstrasse 26, D-75392 Deckenpfronn, Germany

United Kingdom: OMEGA Engineering Ltd.

ISO 9001 Certified

FAX: [phone] e-mail: [email protected]

TEL: [phone] FAX: [phone]
e-mail: [email protected]

FAX: [phone] e-mail: [email protected]

Toll-Free: 0800 8266342 TEL: [phone]
FAX: [phone] e-mail: [email protected]

One Omega Drive, River Bend Technology Centre, Northbank
Irlam, Manchester M44 5BD United Kingdom
Toll-Free: 0800-488-488 TEL: [phone]
FAX: [phone] e-mail: [email protected]

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI
regulations that apply. OMEGA is constantly pursuing certification of its products to the European New
Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

Catalogue

I. Summary

…………………………………………………………… 2

II. Applications ……………………………………………………… 2

III.

IV.

V.

VI.

VII.

VIII.

IX.

X.

XII .

Features …………………………………………………………………2

Specifications…………. ……………………………………………… 3

Warnings…. ……………………………………………………………3

Work Conditions …………………………………………………… 4

Preparation for Measurement ……………………………………4

Measuring Procedure …………………………………………… 5

Calibration of Nominal Values ……………………………………5

Measuring Technique ……………………………………………… 6

Parts List ……………………………………… 8

Appendix 1

Preparation of water of zero turbidity ………………………………… 9

Appendix 2

Preparation of Formazine standard turbidity solution …………… 10

Appendix 3

Diluting & Preparing List of Standard Solutions of Turbidity…………12

1

I. Summary

TRH-3 scattered light turbidity meter is used for measuring the

degree of light scattering generated by the insoluble grain matters

suspended in water or transparent liquids.

It adopts the Formazine standard solution of turbidity specified in

international standard ISO7027, and NTU as the measure unit.

II. Applications

It can be broadly applied in the measurement of turbidity in power plants,

waterworks, treatment stations of domestic sewage, beverage factories,

environmental protection departments, industrial water, wine and

pharmaceutical industries, epidemic prevention divisions, hospitals etc.

III. Features

a) AC & DC power supply, low power consumption, handheld contour design,
for field and lab use.

b) Auto power-off function and low power usage prolongs battery life.

c) Large LCD display

d) Low-drift and high-accuracy integrated circuit, with long-life light source

e) Low battery indicator

g) 0 to 2V output measured value

2

IV. Specifications

a

b

c

d

e

f

g

h

Measuring principle: 90°scattered light

Measuring range: 0~20 NTU

Min. indicating value: 0.01 NTU
Accuracy: ±8%（±2.5% F.S）

Repeatability: ≤1%

Zero drift: ≤1% F.S

Power supply: DC 1.5V, 5 AA alkaline dry cells

AC 110V/50Hz DC7.5V 0.2A power supply adapter

Signal output: 0~2V, impedance >100KΩ

V. Warnings

TRH-3 scattered light turbidity meter is a photoelectric fine measuring

instrument. You should carefully read and comprehend the instruction

manual before operation.

a) When changing batteries, observe polarity, otherwise the instrument

may be damaged.

b) The measuring cell, it must be kept clean, dry, and dust free.

Install light shading cover when not in use.

c) In humid conditions, readings may take longer.

d) The solution to be measured should be poured in

along the test bottle wall to prevent the generation of air

bubbles, which negatively affect the measuring exactness.

3

e) Unit must be recalibrated after changing test bottles or standard

solution, or after service.

f) When the upper left corner of the screen indicates “LOBAT”, the

battery should be changed.

VI. Work Conditions

a) The instrument should be placed on a level and smooth surface,

avoiding direct light.

b) The instrument should be kept away from strong vibrations and strong

magnetic field interference.

c) There should be no flamable dust or corrosive gas in the ambient air.

VII. Preparation for Measurement

a) Press the power switch on the left of the instrument, and allow the unit to

warm up for 30 seconds;

b) Wipe the test bottle with paper towel free of oil (glass cleaner can be used if needed)

c) Prepare the water of zero turbidity for zero adjustment and

Formazine standard solution of 10NTU for calibration;

d) Obtain sample with a clean container.

4

VIII. Measuring Procedure

a) Place test bottle filled with zero turbidity water

into the sample holder and make sure that the scale line of the test

bottle is aligned with the white position line on the sample holder,

and then cover with the light shading cover;

b) Turn the “Zero Adjust” button after getting a stable reading,

until the display reads zero

c) Load the standard solution into the sample holder adopting the same

method, and turn the “Correction” button, to make it indicate the

nominal value;

d) Repeat steps a), b), and c), until the zero point and standard

value are reliable;

e) Load the test bottle, and note down the turbidity value of the

water sample after stable.

f) The instrument will automatically shut down in 15 minutes after start-up.

IX. Calibration of Nominal Values

Calibration of nominal values must be performed after changing test

bottle, damaging test bottle, invalidation of standard solution or

servicing instrument.

a)

b)

Prepare 100ml standard solution of 10 NTU turbidity, and a

pure water zero turbidity solution.

Pour the prepared standard solution of turbidity in 10 NTU into the

correcting test bottle to the scale line, and then screw on

the bottle lid. Make sure the lid edge is free of leaks. Wipe

any water marks and fingerprints from the bottle surface.

Do not touch the bottle surface directly, so as to avoid leaving

fingerprint which would affect the measuring accuracy.

5

c)

d)

e)

f)

g)

h)

i)

k)

Carefully pour the zero turbidity water into the zero adjusting test

bottle and the sample test bottle using the same method;

Start and warm up the instrument, place the zero calibrating

sample bottle loaded with zero turbidity water into the sample

holder and make sure that the scale line of the sample bottle is

aligned with the white position line on the sample holder, and then

cover with the light shading cover.

Turn the “Zero Adjust” button after getting a stable reading,

until the display reads “0.00”;

Remove the 0.0 sample test bottle and load the standard solution

of 10 NTU into the sample holder

Using the same method, and turn the “Correction” button after

getting a stable reading, until it displays “10.0”.
Repeat steps until the zero reading and standard values are reliable.

Place the zero adjusting test bottle loaded with water of zero

turbidity into the sample holder using the same method, and

label the bottle with the value after getting a steady reading.

Place the correcting test bottle loaded with standard solution of

10 NTU into the sample holder adopting the same method, and

write the value onto the bottle lid after getting a steady reading value.

X. Measuring Technique

Obtaining accurate turbidity readings, depends on having a quality

Instrument as well as good operational skills. Be sure to use clean test

calibration set-up in order to obtain the best turbidity readings.

6

.

a) Measurements should be made immediately after sampling,

to avoid changes caused by temperature variation and particles

settling in the water sample.

b) The test bottle must be very clean without scratches. Wash the inside

and outside of the test bottle with glass cleaning agent, then rinse

repeatedly with distilled water, and dry in the dust free dry-box. If

the test bottle needs extra cleaning, you can soak it in diluted

hydrochloric acid for 2 hours, and finally rinse repeatedly

with distilled water. Take the test bottle only by its upper half, so as

to avoid any fingerprints in the light path.

c) It is critical to accurately prepare the standard solution of Formazine

close to the expected test value. Verify calculations for standard

solution prior to mixing. Completely mix the solution and fill the

test bottle to the line. Mixing low turbidity standard solutions in

larger volumes will reduce preparation error.

d) When selecting standard solutions values and preparing

solutions, it’s better to pick turbidity values a little high than

those of the sample value. Notice that, the standard solutions in

low turbidity are not suitable for storage due to the short shelf life.

Sufficiently mix the solution before scaling, but avoid generating

any air bubbles. For the measurement of low turbidity and

high accuracy you must use the same test bottle to perform any

scaling. Use ultraclean water when performing zero adjustment.

7

d) The representative water sample will reflect the turbidity of the

water source. Therefore, the water samples from all sampling

points must be sufficiently blended before measuring. Also

avoid water samples with sedimentation and bigger particles.

Remove the air bubbles from the test bottle before taking a

reading. When measuring on water samples in lower temperature,

condensed water drops may occur to the bottle surface.

Therefore, the bottle with water samples in must be left at room

temperature until the sample is close to the ambient temperature.

Be sure to clean the bottle after it is at room temperature.

e) The scale line of the bottle body should be aligned with the position

line on the sample holder, and the light shading cover in place,

avoiding interference from stray light. When measuring the sample,

the indicated value may not completely stabilize due to movement

of the particles in the water sample, the value will gradually get

stabilize over time. Unsteady readings may also be caused by

too many air bubbles or foreign matter in the water sample. When

reading are unstable use the average between the maximum and

minimum values.

g) In the wine industry uses EBC turbidity units, divide the NTU

value by 4 to get the EBC turbidity value.

(1EBC turbidity = 4NTU turbidity)

XII. Parts List

1. Turbidity meter

2. Power supply adapter

3. Light shading cover

4. Test bottles (3)

5. Instruction manual

8

Appendix 1

Preparation of water of zero turbidity

By referring to method specified under ISO 7027, select

microporous filter membranes of hole diameter of 0.1µm (or 0.2µm) to

filter distillated water (or electro-dialyzed water or ion exchange water)

at least two times. The filtered liquid will be water of zero turbidity for

setting and calibration. The zero turbidity water should be stored in a

glass bottle that has been cleaned and flushed with such water.

Water of zero turbidity is used for zero setting of turbidity meter

and diluting of Formazine standard solution.

9

Appendix 2

Preparation of Formazine standard turbidity solution

1.
The supplied Formazine standard solution is 400 (NTU, FTU)

turbidity. The uncertainty is ±3% and has a one year shelf life.

obtained by diluting Formazine turbidity standard solution with

water of zero turbidity that are calibrated in a certified volumetric

vessel.

preserved in cold room (at 4-8 C

solution that has been diluted to low turbidity value is unstable and

is should be disposed of soon after being used.

2.

When Formazine substandard solutions are hard to obtain.

They can be prepared with method specified under ISO 7027, with

strict controlled conditions and reagent dosage. The method is

excerpted as following:

Formazine standard solution of different turbidity values is

Formazine standard solutions above 400 NTU shall be

) of the refrigerator. Standard

2.1 Instrument and reagent

Analytical balance: load 200g, precision 0.1mg, calibrated and certified.

Volumetric bottle: 100ml, Grade A, calibrated and certified.

and

Liquid transfer tube: 5ml, Grade A, calibrated

Hydrazine sulfate (N
than 99%.

2H6SO4): analytical reagent, purity shall be greater

10

certified.

Hexamine (C6H12N4): analytical reagent, purity shall be greater than

99%.

Thermostat (or water bath): that can hold 200ml volumetric bottle,

constant temperature at 25±1

consecutively for 24h and above.

Water of zero turbidity: see Appendix 1.

, can operate

C

2.2

Preparation method:

a.

To weigh up accurately 1000g hydrazine sulfate accurately and to

dissolve it in water of zero turbidity. Transfer solution thereof to 100ml

volumetric bottle and to dilute to scale, shake up and filter for spare

purpose (to be filtered with microporous filter membrane of hole

diameter of 0.1µm, the same)

To weigh up accurately 10.00g hexamine accurately and to dissolve it in

b.

water of zero turbidity. Transfer solution

and to dilute to scale, shake up (to be filtered with microporous filter

membrane of hole diameter of 0.1µm, the same).

c.

Preparation of 4000 NTU Formazine standard solution: to transfer

accurately 100ml of the said solutions and to empty them into 200ml

volumetric bottle and shake up. The bottle must be placed into 25±1

thermostat or water bath of constant temperature for 24 hours and

protected against light. Thereafter, 4000 NTU standard solution is

ready.

thereof to 100ml volumetric bottle

To increase the reliability of the preparation value, several groups

and bottles of Formazine standard solutions may be considered to

be prepared to verify the preparation consistency. Meanwhile,

turbidity change of the Formazine standard solutions shall be

observed. Such solution may be used only after its stability has

11

C

been verified and its turbidity change during using process does not
exceed ±3

place with temperature at 4

. The prepared solution shall be preserved in a dark

8 .

C

Appendix 3

Diluting & Preparing List of Standard Solutions of Turbidity

Total preparing volume is 100ml

Solution Strength

Demanded

(NTU)

10 2.5

50 12.5

100 25

Formula of preparation: A=

Where: A: Volume of raw liquor (ml)

B: Solution strength required(NTU)

C: Strength of raw liquor(NTU)

K: Total preparing volume (ml)

Taken Volume of Raw

Liquor in 400NTU (ml)

K

B

C

12

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship
for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1)
month grace period to the normal one (1) year product warranty to cover handling and shipping
time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer
Service Department will issue an Authorized Return (AR) number immediately upon phone or
written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired
or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action
of the purchaser, including but not limited to mishandling, improper interfacing, operation outside
of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit
shows evidence of having been tampered with or shows evidence of having been damaged as a
result of excessive corrosion; or current, heat, moisture or vibration; improper specification;
misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in
which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability
fo r any d a mag e s that re sult fr om t h e use of it s prod u cts in ac cord a nce wi th
information provided by OMEGA, either verbal or written. OMEGA warrants only that
the parts manufactured by the company will be as specified and free of defects.
OMEG A MA KES NO OTHER WARR ANTIE S O R R EPRES ENTAT IO NS OF ANY KIND
WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED
WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The
remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA
wi th r e spe c t to t h is or d er, wh ethe r base d on con t rac t , warr anty , negl igen c e,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
com ponent upon which l iability is based. In no eve nt shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a
“Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or
(2) in medical applications or used on humans. Should any Product(s) be used in or with any
nuclear installation or activity, medical application, used on humans, or misused in any way,
OMEGA assumes no responsibility as set forth in our basic WARRANTY / DISCLAIMER language,
and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability
or damage whatsoever arising out of the use of the Product(s) in such a manner.

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.

RETURN REQUESTS/INQUIRIES

BE F O R E RE TURNING AN Y PRODUCT(S ) TO OMEGA, PURCHASER MU S T OBTAIN AN
AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN
ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the
outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to
prevent breakage in transit.

FOR WARRANTY
following information available BEFORE
contacting OMEGA:

1. Purchase Order number under which
the product was PURCHASED,

2. Model and serial number of the product

under warranty, and

3. Repair instructions and/or specific

problems relative to the product.

OM EGA ’s pol i cy is to mak e r un n in g c ha n ge s , not mod e l cha n ge s , when eve r an imp r ov e me n t is po s sib le.
This affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2012 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, repro-

duced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.

RETURNS, please have the

FOR NON-WARRANTY REPAIRS,

consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the

COST of the repair,

2. Model and serial number of the

product, and

3. Repair instructions and/or specific problems

relative to the product.

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