HF scientific DRT-100B User Manual

DRT-100B!&!DRT-100B!RESEARCH

TURBIDIMETERS

Catalog!No.!50027!(5/00)

HF!scientific,!inc.
3170!Metro!Parkway
Fort!Myers,Florida!33916-7597
Phone:!!(941)!337-2116
Fax:!!(941)!332-7643

FOREWORD

HF!TURBIDIMETERS

HF!turbidimeters!are!manufactured!to!meet!design!criteria!for!nephelometers!as!described!in!Standard
Methods!For!Examination!of!Water! and!Wastewater.!!HF!turbidimeters!are!approved!by!the!U.S.!EPA*!as!a!means
to!measure!the!turbidity!of! potable!water,!waste!water,!and!other!liquids.

HF!turbidimeters!provide!a!linear!display!of!turbidity,!throughout!all!ranges,!in!Nephelometric!Turbidity
Units!(NTU).!!HF!turbidimeters!use!solid!state!electronic!components!because!they!resist!thermal!variation!and!are
not!affected!by!normal!line!voltage!fluctuations.

HF!turbidimeters!can! be!calibrated!using!HF!scientific!factory!certified!Secondary!Standards!or!Formazin.
Factory!calibration!is!accomplished!using!HF!scientific!Secondary!Standards,!which!are!factory!certified!traceable
to!Formazin,!therefore,!this!instruction!manual!describes! the!proper! procedures!for!calibration!of!HF!turbidimeters
using! Secondary! Standards.

HF!turbidimeter!manuals!are!designed!to!assist!the!user!in!taking!full!advantage!of!the!instrument!in!a
majority!of!its!applications.!!However,!in!the!event!that!unusual! circumstances!or!problems,!not!covered! by!this
manual,!arise!please!feel!free! to!contact!our!local!distributor!or!the! manufacturer.

HF!scientific,!inc.

3170!Metro! Parkway

Fort!Myers,!Florida!33916-7597

Phone:!!(941)!337-2116

Fax:!!(941)!332-7643

Our!engineering!staff!is!available!to!help!you!with!your!specific!needs.

*EPA!approved!means!the!instrument!meets!or!exceeds!the!design!and!performance!criteria!as!specified!in

the!United!States!Environmental!Protection!Agency!method!180.1.

DRT-100B!(5/00)

MODEL!DRT-100B

IDENTIFICATION!INFORMATION

The!DRT-100B!may!be!identified!by!its!catalog!number!and!description!listed!below:

Instrument

Catalog†No. Description

20012 Standard!Model

20052 Research!Model

Includes! additional! features:!!Alarm
Output;! Recorder! Output,! 0-1! mA;
Flow-thru! unit;! Control! Output,! 4-20
mA;!High!Range!Attenuation

DRT-100B!(5/00)

DRT-100B!(5/00)

OPERATING!INSTRUCTIONS

TABLE!OF!CONTENTS

I. SPECIFICATIONS ........................................................................................................... 1

II. INST ALLATION .............................................................................................................. 2

A. Packing!List!of! Contents ............................................................................................ 2

B. Pre-installation!Checkout ............................................................................................ 2

C. Installation!and!Start-up .............................................................................................. 2

III. MEASUREMENT!PROCEDURES ................................................................................... 3!-!5

A. Adjustable!Set!Point!Alarm!Control!-!Standard!Model!PN!!#20012 ........................... 3

B. Standardization ............................................................................................................ 3!-! 5

C. Sample!Measurement .................................................................................................. 5

IV. CALIBRATION!PROCEDURES....................................................................................... 5!-!7

A. Secondary!Standard!Set ............................................................................................. 5

B. Standard!Formazin!Solutions ...................................................................................... 6

C!. Electronic!Calibration .................................................................................................. 7

V. FEATURES!INCLUDED!WITH!THE!RESEARCH!MODEL!(PN!#20052) ..................... 8!-!9

A. Adjustable!Set!Point!Alarm!Control ............................................................................ 8

B. Recorder! Output,!0-1!mA ........................................................................................... 8

C. Flow!Through!Unit!for!Continuous!Measurement ..................................................... 8

D. Attennuation!Measurement ......................................................................................... 8

E. Control!Output,!4!-!20!mA ......................................................................................... 9

VI. OPTIONAL!FEATURE ..................................................................................................... 9

VII. SOURCE!LAMP!REPLACEMENT!AND!ALIGNMENT ................................................. 10

VIII. ACCESSORIES!AND!SUPPLIES .................................................................................... 11

WARRANTY ..................................................................................................................... 13

DRT-100B!(5/00)

I. SPECIFICATIONS

_________________________________________________________________________

0 - 1

Ranges NTU 0 - 10

0 - 100
0 - 1000*

_________________________________________________________________________

Linearity

Repeatability

+ 1% of full scale

+ 1% of full scale

Sensitivity .01 NTU
_________________________________________________________________________

Power Consumption 45 Watts (Nominal)

Fuse-0.5A (120V)
Fuse-0.25A (240V)

_________________________________________________________________________

Supply V oltage 120V A C±10% 50/60Hz

240VAC±10% 50/60Hz

_________________________________________________________________________

Controls - Range Switch

- Reference Adjust

- Alarm Setting

- On/Off Switch

- 120V/240V Switch

_________________________________________________________________________

Dimensions 8"W x 10 1/2"L x 8 1/2"H
_________________________________________________________________________

Shipping W eight 12 pounds

_________________________________________________________________________
Operating temperature 0° - 50°C (32° - 122°F)

_________________________________________________________________________

*NOTE: On the maximum range of 0 - 1000 NTU the Digital Meter will read as high as 1,999. Readings over 1,000
may not be within published specifications for linearity .

Page!1DRT-100B!!(5/00)

II. INSTALLATION

(A) PACKING LIST OF CONTENTS CAT # QUANTITY

Instruction Manual 50027 1
Reference Standard 0.02 NTU 60002 1
Accessory Case 21116 1
Lamp Alignment Tool 70820 1
Hex key Wrench 1/16” 20944 1
Spanner Wre nch 50122 1
* Recorder and Control output, mating
phone plug 70825 2
* Flow through unit 50071 1
Fuse 5 x 20 mm ½A quick acting (220-240 volt operation) 20955 1
Warranty Card
(* Included with 20052)

A complete listing of spare parts is on page 11 of this Manual.

(B) PRE-INSTALLATION CHECKOUT

1. Extreme care should be taken when unpacking and handling the Reference Standard or sample cu­vettes as surface scratches or finger smudges will cause measurement errors. Handle these items by
the top only . (See Fig. 1)

(C) INSTALLATION AND START-UP

1. The instrument is factory set for 120 volt operation. If 240 volt operation is desired, set the switch on
the back of the instrument to “240”, change fuse to ½A quick acting and provide appropriate power
cord.

2. The Range Selector switch located on the front of the instrument should be in the 1000 range position.

3. Leave the Light Shield cap in place on the instrument when it is not in use in order to protect the
sample well from dust, etc.

4. For best operation it is recommended that the instrument be left on continuously .

NOTE: A 240V fuse is provided in accessory kit.

Page!2DR T-100B!!(5/00)

III. MEASUREMENT PROCEDURES

(A)

(B)

ADJUSTABLE SET POINT ALARM CONTROL

This allows the user to set an alarm where a lamp will be illuminated if the NTU readings should become
larger than the value set. The alarm point is set by placing the three position “ALARM” switch labeled
“SET”, “NORM”, to the “SET” position. The potentiometer behind the face plate next to the “ALARM”
switch is then adjusted until the digital display shows the desired value. The “ALARM” switch is then re­turned to “NORM”. At anytime, the alarm limit currently set in the instrument may be determined by moving
the “ ALARM” switch to the “SET” position and reading the digital display. Placing the switch in the “OFF”
position on PN #20012 will cause the unit to operate just as if the switch were placed in the “NORM” position.

STANDARDIZATION

The Reference Standard supplied with this instrument is a pure liquid sealed in glass. It has a value of 0.02
NTU.

Extreme care should be taken to avoid surface scratches on the Reference Standard cuvette. Scratches, to­gether with dust or film cause analysis error . The Reference Standard optical surface should be wiped clean
each time it is to be used and it is important to use a lint free wiper such as “Kimwipes”.

If cleanliness of the Reference Standard cuvette is in doubt, wash with detergent rinse seve ral times and polish
with “Kimwipes”. Figure 1 shows the critical measuring area in all measuring containers.

The Reference Standard (Catalog No. 60002) should be replaced at least once per year .

The EPA recommends that cuvettes used for instrument calibration or sample measurement be indexed. For
quick and repeatable indexing of the Reference Standard, an indexing ring and locator pin are included with
this instrument.

When shipped, the white locator pin is installed in the collar ring around the optical well of your turbidimeter.
The indexing ring is included in the accessory kit of this instrument.

To index your Reference Standard, slowly rotate the Reference Standard, at least one complete revolution,
while observing the reading, and locate the position of the lowest reading. Without moving the Reference
Standard, install the indexing ring over the ridged cap of the Reference Standard such that the notch on the ring
aligns with the locator pin.

When standardizing this instrument in the future, simply insert the reference standard and rotate it until the
notch on the indexing ring faces the locator pin. Standardize as per the following instructions. (
thatha

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Page!3DRT-100B!!(5/00)

Use the following procedure to standardize:

1. Place the Reference Standard in the Optical Well, indexed as described above.

2. Place the front panel Range Switch in the 1 NTU range.

3. Set the Reference Adjust knob, in the left forward corner instrument, such that the display reads .02
NTU.

Bottom

The turbidimeter’s optical system measures the liquid sample through this section of the Reference Standard,
grab sample cuvette or Flow-Thru V ial. It is therefore important that this 3/4" wide band of the glass container be
kept clean and free of scratches or abrasion.

FIGURE 1

Page!4DR T-100B!!(5/00)

(B) STANDARDIZATION (cont’d)

The instrument is now referenced to the factory calibration and unknown samples may be read directly in NTU.
For best accuracy, the instrument should be standardized on a scheduled basis. The need to actually adjust
standardization will vary depending upon the operational environment.

(C)

SAMPLE MEASUREMENT

1. Place the sample in the Optical W ell.

2. Set the Range Switch located on the front panel to an appropriate range.

3. Read the value on the digital display .

For accurate measurements in the low range rotate “grab samples” cuvettes in the well to obtain the minimum
reading. Mark the cuvette and the instrument so that orientation of the cuvette will be identical each time it is
placed in the instrument. Always use the cuvette cap when measuring a grab sample.

NOTE:

1. Settling particles or air in the sample may cause the digital reading to change rapidly. Readings should
be taken without delay before turbid particles settle.

2. Cuvettes must be clean and free of smudges or scratches. Cleaning is accomplished by washing in a
detergent solution then rinsing thoroughly 8 to 10 rinses in clean, preferably distilled, water to remove
all streaks.

Scratched cuvettes should be replaced.

Reusable cuvettes, (pkg. of 10 each - catalog number 50052, pkg of 3 - catalog number 50051) should
be stored in a clean, dust free environment.

IV. CALIBRATION PROCEDURES

(A) SECONDARY STANDARD SET (optional) Catalog No. 19887

HF Secondary Standards are recommended and certified by HF scientific. They are traceable to

freshly prepared formazin primary standards. These standards are very easy to use off the shelf anytime
without preperation making them an ideal turbidity standard. A Certified of Traceability is available on
request to HF scientific Customer Service Depatartment. HF Secondary Standards may be used for calibra­tion of all HF turbidimeters. Order from HF scientific, inc.

NOTE:NOTE:

NOTE:

NOTE:NOTE:

Do not frDo not fr

Do not fr

Do not frDo not fr
Do not shake standards.Do not shake standards.

Do not shake standards.

Do not shake standards.Do not shake standards.

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Specific instructions for the usage of the certified Secondary Standard are included with the kit.

Each Secondary Standard Kit contains:

-- Instructions

-- 0.02 Reference Standard

-- Certified Secondary Standard 8.00 and 800 NTU are contained in preselected cuvettes with
light sheild caps.

-- A sturdy storage case.

Page!5DRT-100B!!(5/00)

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(B) STANDARD FORMAZIN SOLUTIONS

Calibration of this instrument is based on Formazin, a material which can be made by synthesis and
reproduced repeatedly within one percent. When properly mix ed, it is uniform in the number, size and shape of its
particles, thus making it an ideal turbidity standard. The unit of measure, and thus the calibration of this instru­ment is in Nephelometric Turbidity Units (NTU) based on F ormazin.

Calibration samples may be obtained by diluting Formazin Stock Suspension using “turbidity-free”
water. Formazin Stock Suspension may be pr epared by the user (Ref. A.W.W.A. “Standard Methods 17th
Edition”) or it may be purchased in kit form — H.F . Scientific P art No. 50040.

Each kit contains:

Contents Units Qty .

Instruction Manual ea. 1

Formazin 4000 NTU Stock Solution 500 ml 2

Turbidity-free 0.02 NTU water gal/4L 1

Selected Cuvettes ea. 4

Cuvette caps ea. 4

Reference Standard ea. 1

Pipettes graduated 1ml, 10ml, 25ml set 1

Shake Formazin Stock Suspension each time before pipetting to insure even dispersion of the suspen­sion. Rinse cuvettes with solution they are to contain.

The following table gi ves the relationship between dilutions of the stock suspension and NTU’ s. Be
sure to adequately mix the stock suspension prior to removing a portion for dilution.

NTU valueNTU value

NTU value

NTU valueNTU value

PipettePipette

Pipette

PipettePipette

AmountAmount

Amount

AmountAmount

Base FormazinBase Formazin

Base Formazin

Base FormazinBase Formazin

VV

olumetrolumetr

V

olumetr

VV

olumetrolumetr

ic Flaskic Flask

ic Flask

ic Flaskic Flask

8.0 NTU 10.0ml 2.0ml of 4000 NTU 1000ml

800.0 NTU 10.0ml 20.0ml of 4000 NTU 100ml

NOTE: 1. When the prepared samples start to flocculate, they are unreliable and fresh ones must be made. This

will occur more rapidly for the lower value diluted suspensions.

Page!6DR T-100B!!(5/00)

(C) ELECTRONIC CALIBRATION USING HF SECONDARY STANDARDS OR FRESHLY PREPARED

FORMAZIN SOLUTIONS

Before calibration is attempted, it is important to note that all the calibration potentiometers (reference adjust, linearity ,
span) are inter-related. That is, adjusting one will also affect the v alue of the other ranges slightly.

1. Prepare, on the day of calibration, standards of 8 and 800 NTU using the dilution chart in this manual under
Section IV. A.

2. Clean, with “Kimwipes” and windex, the reference standard and the 8 and 800 NTU standards.

3. T o locate the calibration potentiometers, remove one screw and loosen the other fr om the access cover and turn
it to the side.

4. Set the range selector switch to the 1 range. Standardize the instrument as described in this manual under
Section III B. If your reference standard has never been indexed or if it is a new reference standard index it at
this time (review Section III. B., Reference Standard Indexing, in this manual).

5. Set the range selector switch to the 10 range. Insert the 8 NTU standard. Note the reading on the digital
display.

6. Set the range selector switch to the 1000 range. Insert the 800 NTU standard. Note the reading on the digital
display.

7. Before making any adjustments remember that the calibration potentiometers affect each other slightly . Here
is an example calibration:

a) Set range selector switch to the 1000 range. Insert the 800 NTU standard. Adjust span potentio-

meter (1000 range, 800 NTU standard) until the digital display reads 800 NTU +10 NTU.

b) Then set the range selector switch to the 10 range. Insert the 8 NTU standard. Adjust linearity (10

range, 8 NTU standard) to make the 8 NTU standard read approximately 8 NTU on the digital
display.

c) Re-standardize instrument.

d) Repeat steps 5 & 6. If the 8 NTU standard is not 8 NTU +.1 NTU or the 800 NTU standard is not

800 NTU +10 NTU then repeat step 7 a thru d until the instrument reads the correct value for all
standards with no further adjustments required.

Page!7DRT-100B!!(5/00)

V. FEATURES INCLUDED WITH THE 20052 RESEARCH MODEL

(A)

ADJUSTABLE SET POINT ALARM CONTROL

This feature provides “Dry” contact closure when the measured value exceeds a preset limit. In addition
to the dry contact closure, the DRT-100B has a red lamp on the front of the unit that illuminates when the
current NTU readings exceed the alarm limit. This limit can be set by placing the three position “ ALARM”
switch labeled “SET’, “OFF”, “NORM” to the “SET” position. The potentiometer behind the face plate
is then adjusted through a hole in the face plate until the digital display shows the desired value. The
“ALARM” switch is then returned to the “NORM” position. At anytime, the alarm limit currently set in
the instrument may be determined by moving the “ALARM” switch to the “SET” position and reading
the digital display.

Three terminals (“NC”, “C”, “NO”) are located on the rear panel and are used to connect the user’s alarm
circuit. These contacts are rated at 5 amps at 110 VAC, 2.5 amps at 230 VAC. The switch may be set to
“OFF” to deactivate these contacts during Standardization or Calibration to prevent false alarms.

(B)

RECORDER OUTPUT, 0 - 1 MA

This output is obtained through the mini-phone jack marked “0 - 1 mA” on the rear panel of the instrument.
(Mating plug supplied in accessory kit).

(C) FLOW-THRU UNIT FOR CONTINUOUS MEASUREMENT

This feature allows the continuous measurement of the turbidity of a process. The cell will accept a maxi­mum pressure of 60 p.s.i., and a maximum flow rate of 1.5 U.S. g.p.m. The speed of response to a change
in process turbidity will, of course, depend on the length of the tubing connecting the measuring head to the
process, and therefore this tubing should be kept as short as possible.

Should air or gas bubbles be present in the tubing from the process, the Flow Clamp (Part #50004) should
be placed on the effluent tubing and adjusted to provide enough back pressure to eliminate all bubbles.

The EP A recommends that cuvettes used for instrument calibration, standardization or sample measurement
be indexed. For quick indexing of the flow through cuvette a rotational flow through assembly with locking
collar has been installed.

T o index your flo w through cuvette, slowly rotate the flow head at least one re volution, while observing the
reading and locate the position of lowest reading. W ithout moving the flo w head, press down the flow head
and turn the locking collar until the flow through assembly is securely locked in place.

(D) ATTENUATION MEASUREMENT

This feature may be used for measurements in excess of 1000 NTU’ s. Set the “ATTN. - NTU” switch to
“ ATTEN”. The instrument is now in the light attenuation mode and the side detectors are not in the circuit.

Relative measurements can now be made. Known samples should be compared to readings on the digital
display and a graph drawn that will allow the user to determine process values (e.g., p.p.m. suspended
solids) from readings on the digital display .

Page!8DR T-100B!!(5/00)

(E) CONTROL OUTPUT, 4 - 20 MA

This feature, which would be used in conjunction with the “Flow Through Unit” feature (Part #50028)
provides a control output that varies with changing measured values of a continuous process. The control
output is obtained through the mini-phone jack marked “4 - 20 mA” on the rear panel of the instrument.
Low and high adjustments for setting desired actuation of the control element for other ranges are located
behind the access cover on the front of the instrument.

VI. OPTIONAL FEATURE

W ell Adapter for 16 mm cuvette measurement (Catalog No. 20115).

This feature is for use in applications where the sample size is limited, or where the turbidity of the mea­sured value is sufficiently great that all the light is absorbed in the greater volume of the 28 mm cuvette.
(NOTE: The approximate volumes r equired for measurement in the two different cuvettes ar e 10 ml, in the
16 mm cuvette, and 25 ml in the 28 mm cuvette.)

Page!9DRT-100B!!(5/00)

Figure 2

FOCUS LAMP

FOR SHARPEST

VERTICAL

IMAGE OF FILAMENT

CENTERED ON

TARGET

Lamp shown here from top view.

VII. SOURCE LAMP REPLACEMENT & ALIGNMENT

Turn instrument power OFF and disconnect po wer source. Remov e cover from instrument by unscre wing
collar ring on top surface.(Spanner Wrench provided.) Remove the range switch knob (Hex key wrench
provided) and six (6) screws from the sides of the cover. Also remove nut and washer from alarm set
switch. (older models) Remove the four (4) screws that secure heat shield to chassis. Remove heat shield.

The lamp is removed by loosening Screw #1 and removing the electrical leads from TB2 - 5 & 6. Insert new
lamp assembly in place and reconnect electrical leads. The lamp should be positioned so the filament is
perpendicular to the baseplate of the instrument. The new lamp must now be aligned and focused. Insert
lamp alignment tool, HF catalog number 70820, into the Optical Well. Turn instrument on to 1000 NTU
range. Position the lamp so that an image of the filament falls within the rectangular box on the lamp
alignment tool. If necessary, the height of the filament image may be adjusted by loosening Screw #2.
Loosen Screw #3 and move lamp bracket assembly in or out until a narrowly focused image of the
filament is obtained within the rectangular box. Once the filament image has been aligned and focused,
tighten Screws #1, 2, and 3 snugly. Check the focus and alignment to be certain no movement had taken
place during tightening of the screws.

PT. NO.-70820

*NOTE: Dotted line shown represents

lamp filament image.

*IMPORTANT - Do not tighten Screw #1 too much as it may crush the base of the lamp.

Replace heat shield. Position the cover in place over the instrument and replace the screws, the
knobs, the rubber gasket, the locking collar , and alarm set switch nut and washer. (older models)

Page!10DRT-100B!!(5/00)

VIII. ACCESSORIES & SUPPLIES

PART # DESCRIPTION

20469 PC Board Assy (20012)

20470 PC Board Assy (20052)

20702 Reference Adjust Potentiometer

20973 Fuse, 5 x 20 mm ½A SLO-BLOW (110-120 volt operation)

21001 Lamp Bracket Assy

20850 Photo Diode

21460 Case Accessory (Empty)

60002 Reference Standard

50096 Lamp Assembly 2/pk.

50027 Instruction Manual DRT-100B

50051 Cuvette, Selected, 28 x 70 mm, 3 Pk.

20115 16mm adapter kit (Factory installed only)

20955 Fuse, 5 x 20 mm ½A quick-acting (220-240 volt operation)

20492 PC Board Assembly (20012) S/N 27007 and higher

20493 PC Board Assembly (20052) S/N 27317 and higher

19887 Secondary Standard Kit

50122 Spanner Wrench (collar removal)

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Page!12DRT-100B!!(5/00)

WW

ARRANTYARRANTY

W

ARRANTY

WW

ARRANTYARRANTY

HF scientific, inc., as vendor , warrants to the original purchaser of the instruments to be free of defects in

material and workmanship, in normal use and service, for a period of one year from date of delivery to the original
purchaser . HF scientif ic, inc.’s, obligation under this warranty is limited to replacing, at its factory, the instrument or
any part thereof. Parts which by their nature are normally required to be replaced periodically, consistent with
normal maintenance, specifically lamps including fluorescent backlight, reagent, desiccant, sensors, electrodes and
fuses are excluded. Also excluded are accessories and supply type items.

Original purchaser is responsible for return of the instruments, or parts thereof, to HF scientific, inc.’s

factory . This includes all freight charges incurred in shipping to and from HF scientif ic, inc.’s factory.

HF scientific, inc. is not responsible for damage to the instrument, or parts thereof, resulting from misuse,

negligence or accident, or defects resulting from repairs, alterations or installation made by any person or company
not authorized by HF scientific, inc.

HF scientific, inc. assumes no liability for consequential damage of any kind, and the original purchaser , by

placement of any order for the instrument, or parts thereof, shall be deemed liable for any and all damages incurred
by the use or misuse of the instruments, or parts thereof, by the purchaser, its employ ees, or others, following receipt
thereof.

Carefully inspect this product for shipping damage, if damaged, immediately notify the shipping company

and arrange an on-site inspection. HF scientific, inc. cannot be responsible for damage in shipment and cannot assist
with claims without an on-site inspection of the damage.

This warranty is given expressly and in lieu of all other warranties, expressed or implied. Purchaser agrees

that there is no warranty on merchantability and that there are no other warranties, expressed or implied. No agent is
authorized to assume for HF scientific, inc. any liability except as above set forth.

HF scientific, inc.
3170 Metro Parkway
Fort Myers, Florida 33916-7597
Phone: [phone]
Fax: [phone]

Page!13DRT-100B!!(5/00)