Hanna Instruments HI 83749 Bedienungsanleitung

HI 83749

Turbidity & Bentocheck

Instruction Manual

www.hannainst.com

Australia:

Tel. (03) 9769.0666 • Fax (03) 9769.0699

China:

Tel. (10) 88570068 • Fax (10) 88570060

Egypt:

Tel. & Fax (02) 2758.683

Germany:

Tel. (07851) 9129-0 • Fax (07851) 9129-99

Greece:

Tel. (210) 823.5192 • Fax (210) 884.0210

Indonesia:

Tel. (21) 4584.2941 • Fax (21) 4584.2942

Japan:

Tel. (03) 3258.9565 • Fax (03) 3258.9567

Korea:

Tel. (02) 2278.5147 • Fax (02) 2264.1729

Malaysia:

Tel. (603) 5638.9940 • Fax (603) 5638.9829

Singapore:

Tel. 6296.7118 • Fax 6291.6906

South Africa:

Tel. (011) 615.6076 • Fax (011) 615.8582

Taiwan:

Tel. 886.2.2739.3014 • Fax 886.2.2739.2983

Thailand:

Tel. (662) 619.0708.11 • Fax (662) 619.0061

United Kingdom:

Tel. (01525) 850.855 • Fax (01525) 853.668

USA:

Tel. (401) 765.7500 • Fax (401) 765.7575

For e-mail contacts and a complete list of Sales and Technical offices, please see

www.hannainst.com.

MAN83749R1

11/05

SALES AND TECHNICAL SERVICE CONTACTS

Dear Customer,

Thank you for choosing a Hanna Instruments product. This manual will provide you with the

necessary information for correct use of the instrument.

Please read this instruction manual carefully before using the instrument.

If you need additional technical information, do not hesitate to e-mail us at [email protected]

or see the back side of this manual for our worldwide sales and technical service contacts.

This instrument is in compliance with directives.

TABLE OF CONTENTS

WARRANTY ............................................... 2

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

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

ABBREVIATIONS ....................................... 5

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

MEASUREMENT UNITS............................... 6

SPECIFICATIONS ........................................ 7

FUNCTIONAL DESCRIPTION ........................ 8

GENERAL TIPS FOR AN ACCURATE

MEASUREMENT....................................... 10

CALIBRATION PROCEDURE ....................... 12

TURBIDITY MEASUREMENT ...................... 16

BENTOCHECK (PROTEIN STABILITY TEST) ... 18

DETERMINATION OF BENTONITE

REQUIREMENT ........................................ 20

LOGGING ................................................ 24

GOOD LABORATORY PRACTICE (GLP) ......... 27

SETUP .................................................... 29

LCD BACKLIGHT ....................................... 35

TAG INSTALLATION .................................. 35

LAMP REPLACEMENT ............................... 35

BATTERIES MANAGEMENT ........................ 36

ERROR CODES......................................... 37

PC INTERFACE ......................................... 38

CE DECLARATION OF CONFORMITY ............ 38

ACCESSORIES ......................................... 39

HI 83749 is warranted for two years against defects in workmanship and materials when used for

its intended purpose and maintained according to instructions. This warranty is limited to repair

or replacement free of charge.

Damage due to accidents, misuse, tampering or lack of prescribed maintenance is not covered.

If service is required, contact the dealer from whom you purchased the instrument. If under

warranty, report the model number, date of purchase, serial number and the nature of the failure.

If the repair is not covered by the warranty, you will be notified of the charges incurred. If the

instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization

number from the Technical Service Department and then send it with shipping costs prepaid. When

shipping any instrument, make sure it is properly packed for complete protection.

To validate your warranty, fill out and return the enclosed warranty card within 14 days from the

date of purchase.

WARRANTY

HI 83749-20 Bentocheck (100 mL)

HI 93703-58 Silicone oil (15 mL)

HI 83749-11 Calibration cuvets kit

HI 731331 Glass cuvets (4 pcs)

HI 731335N Caps for cuvets (4 pcs)

HI 93703-50 Cuvets cleaning solution (230 mL)

HI 731318 Tissue for wiping cuvets (4 pcs)

HI 740220 25 mL glass vial with cap (2 pcs)

HI 731341 Automatic pipette 1000 µL

HI 731351 Tips fo automatic pipette 1000 µL (25 pcs)

HI 740233 Filter paper type II (100 pcs)

HI 740142P 1 mL graduated syringe (10 pcs)

HI 740144P Tips for 1 mL syringe (10 pcs)

HI 740234 Replacement lamp for EPA turbidimeter (1 pcs)

HI 92000 Windows®compatible software

HI 920011 RS232 connection cable

HI 920005 5 tag holders with tags

HI 740027P 1.5V AA battery (12 pcs)

HI 710005 Voltage adapter from 115V to 12 VDC (USA plug)

HI 710006 Voltage adapter from 230V to 12 VDC (European plug)

HI 710012 Voltage adapter from 240V to 12 VDC (UK plug)

HI 710013 Voltage adapter from 230V to 12 VDC (South Africa plug)

HI 710014 Voltage adapter from 230V to 12 VDC (Australia plug)

Hanna Instruments reserves the right to modify the design, construction and appearance of its products without

advance notice.

ACCESSORIES

Please examine this product carefully. Make sure the instrument is not damaged. If any damage

has occurred during the shipment, please notify your dealer.

This HI 83749 Turbidity & Bentocheck Meter is supplied complete with:

•Six Sample Cuvets and Caps

•Four Calibration Cuvets (HI 83749-11)

•Bentocheck Reagent (HI 83749-0) and Silicone Oil (HI 93703-58)

•One 1000 µL Automatic Pipette with two Tips and Instructions Sheet

•Four 25 mL Glass Vials with Caps

•One 1 mL Syringe with two Tips; one Funnel; Filter Paper (25 pieces).

•Five Tag Holders with Tags (HI 920005)

•Tissue for wiping the cuvets

•Four 1,5V AA Batteries

•AC Adapter

•Instruction Manual

•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 the original packing with the supplied accessories.

PRELIMINARY EXAMINATION

To fully use the instrument tag identification system function, the measured data has to be

downloaded to a computer. The instrument can use RS232 or USB connection to communicate

with the PC.

When using the RS232 protocol, simply connect a HI 920011 serial cable between the instrument

and the computer.

To use the USB protocol, simply connect a regular USB cable between instrument and PC.

In both cases, the PC must run the HI 92000 application for successful data transfer.

PC INTERFACE

Recommendations for Users

Before using these products, make sure that

they are entirely suitable for your specific

application and for the environment in which

they are used.

Operation of these instruments may cause

unacceptable interferences to other electronic

equipments, this requiring the operator to take

all necessary steps to correct interferences.

Any variation introduced by the user to the

supplied equipment may degrade the

instruments' EMC performance.

To avoid damages or burns, do not put the

instrument in microwave ovens. For yours and

the instrument safety do not use or store the

instrument in hazardous environments.

CE DECLARATION OF CONFORMITY

GENERAL DESCRIPTION

The prevention of protein haze or deposit in bottled white wines is a universal concern and often a

wine needs to be stabilized before bottling. One commonly used stabilization agent is bentonite.

Bentonite is a volcanic clay earth type fining agent (like kaolin). It improves the clarity and stability of

wine but has also negative aspects because of the volume of lees formed, reduction of tannin and

color. Since there are different types and qualities of bentonite with different capacity of protein

removal, it is important to make laboratory trails with the same lot and wetting degree of the bentonite

as that will be used in the cellar.

Protein stabilization is normally not a problem in bottled red wines because of the relatively high

concentration of phenols that binds and precipitates with the instable proteins before bottling. Often

bentonite is added to red wines at a level of about 12 g/hL (1 lb/1000 gal), reducing colloidal

suspended particles thus improving membrane filterability.

Wines with low phenols contents, such as rose, light reds and whites should be checked for protein

stability before bottling. Hanna is offering a rapid test to verify the risk of future protein haze formation.

BENTOCHECK

The HI 83749 is an auto diagnostic microprocessor meter that benefits from Hanna’s years of experience

as manufacturer of analytical instruments.

The meter is especially designed for wine analyses and, beside turbidity measurements, it allows to

make tests to verify protein stability (e.g. Bentocheck).

The instrument compensates wine color to guarantee accurate readings during the vinification process;

also for the darkest red wine samples. The optical system, consisting of a tungsten filament lamp and

multiple detectors, assures long term stability and minimizes the need of frequent calibration. Calibration

can be anyway easily performed at any time in two, three or four points (<0.1, 15, 100 and 500 NTU-

adjustable calibration points), using the supplied or user prepared standards.

The meter has all necessary GLP (Good Laboratory Practice) functions to allow maximum traceability

of data like a real time clock, log-on-demand (up to 200 measurements), and T.I.S. -Tag Identification

System to give all recorded data a location, time and date stamp.

The meter measures turbidity of samples from 0.00 to 1200 NTU (Nephelometric Turbidity Units) and

is USEPA compliant. In the USEPA measurement mode the instrument rounds the readings to meet

USEPA reporting requirements. It has a continuous measurement mode to verify the settling rate of

suspended matter, and a signal average (AVG) mode to accumulate multiple readings giving a final

average value. The AVG routine is particularly useful to measure samples with suspended particles

with different dimensions.

The HI 83749 has a user-friendly interface, with a large backlit LCD (Liquid Crystal Display). Acoustic

signals and displayed codes to guide the user step by step through routine operations.

This valuable splash proof portable turbidity meter is supplied in a rigid carrying case that offers

protection for harsh environments.

USING AN AC ADAPTER

In laboratory you can use an AC adapter to power the HI 83749. Simply connect the AC adapter to the

instrument (see Connectors Description, page 9).

It is not necessary to turn the instrument off when connecting the external adapter.

Note:The connection to the external adapter will not recharge the batteries.

HI 83749 has a powerful diagnostic system. Common errors are detected and reported for easy

diagnostic and maintenance.

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ERROR CODES

If protein instability is detected, a next test can help defining the right amount of bentonite to be

added for improving protein stability. It is important not to overdose bentonite, avoiding stripping

wine flavour, body, and significant loss of color, especially in young red wines. Moreover, adding only

the necessary amount of bentonite to obtain the desired protein stability is also costs saving.

Hanna is the first manufacturer of turbidity instruments that has decided to add the unique T.I.S. - Tag

Identification System to portable turbidity meters, to meet the more restrictive needs for traceability

and data management of our clients.

The system is designed for scientific and industrial applications, or to prove during safety audits and

inspections that samples have been truly taken on pre-established locations.

The system is as easy to install as to operate. Just fix the so-called iButton® tags near your sampling

sites that need to be checked often, and with this the T.I.S. is setup. The tag contains a computer chip

embedded in a durable stainless steel can. It is designed to withstand the harsh environments, indoors

or outdoors. The number of tags that can be installed is practically unlimited, because each tag has a

unique identification code.

Immediately after installation of the tags you can start collecting data. Use the meter to take measurements

and memorize the test result by pressing the Log-on-Demand key. Then, the instrument will ask for the

tag identification. Simply touching the iButton® with the matching connector on the meter does identify

and authenticate logging, by storing the iButton® serial number, time and date stamp events.

The power of the T.I.S. features resides in the PC application. Download all test data to your PC and

use our HI 92000 Windows®compatible application software for further data management. You can

sort or filter all your collected data on different criteria like on a specific sampling location, parameter,

date and time intervals, or fix range to filter measured values. The data can be plotted in a graph,

exported to other common Windows®applications or printed for reporting purpose.

It is also possible to add new tags later on, thus increasing an already existing database. Each time

the PC software recognizes a not already registered tag, it will ask for a description of the new

sampling location.

TAG IDENTIFICATION SYSTEM

NTU Nephelometric Turbidity Units

FTU Formazin Turbidity Units

USEPA US Environmental Protection Agency

LCD Liquid Crystal Display

RTC Real Time Clock

T.I.S. Tag Identification System

ABBREVIATIONS

iButton®is registered Trademark of “MAXIM/DALLAS semiconductor Corp.”

Windows®is registered Trademark of “MICROSOFT Corporation”

BATTERIES REPLACEMENT

To replace the batteries follow the next steps:

• Turn OFF the instrument by pressin ON/OFF.

•Open the batteries cover by pressing the locking clip.

• Take out the used batteries and insert 4 new 1.5 AA size batteries, paying attention to the correct

polarity as indicated on the battery compartment.

•Replace the cover and press it until it locks.

Warning: Replace batteries only in a non-hazardous area.

For field measurements, HI 83749 is powered by 4 AA batteries.

The battery life is enough for 1500 normal measurements.

When you turn the instrument on, the remaining battery life is

estimated and reported in percents.

To save the battery life, the instrument will turn off after 15

minutes of non-use. The backlight will be turn off after 25

seconds since the last key was pressed.

The battery life is measured each time the lamp is turned on

and if the remaining battery life is less than 10%, the battery

tag will blink on the LCD to advise the user to replace the

batteries.

When the batteries are completely discharged, “0% bAtt” message

will be displayed for one second and the instrument will turn off.

In order to use the instrument again, replace the batteries or

use an AC adapter.

BATTERIES MANAGEMENT

Many methods were used to measure turbidity over the years. The Jackson Candle Turbidimeter was

used to measure turbidity as Jackson turbidity units (JTU). The Secchi Disk is commonly used to

measure turbidity in lakes and other deep waters (mg/L SiO2). Both methods are visual and are not

considered very accurate. To obtain more accurate readings a nephelometer should be used as a

turbidity reading instrument.

The HI 83749 turbidimeter reports the measurements in NTU (Nephelometric Turbidity Units).

NTU units are equal to FTU units (Formazine Turbidity Units). The conversion table between these

measurement units is shown bellow:

UTJ UTF/UTN OiS

)L/gm(

UTJ 1 91 05.2

UTF/UTN 350.0 1 31.0

OiS

)L/gm( 4.0 5.7 1

MEASUREMENT UNITS

A light beam that passes through the sample is scattered in all directions. The intensity and pattern of

the scattered light is affected by many variables like wavelenght of the incident light, particle size,

shape, refractive index and color.

The optical system includes a tungsten filament lamp, a scattered light detector (900) and a transmitted

light detector (1800). The microprocessor of the instrument calculates the NTU value from the signals

that reaches the two detectors.

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 HI 83749 turbidimeter is designed to have very low stray light, providing

accurate results also for low turbidity samples. However, special care must be taken when measuring

low turbidities (see General Tips for an Accurate Measurement, page 10).

PRINCIPLE OF OPERATION

The LCD can be illuminated to allow the user to see the readings even in dark

environments.

To turn on or off the backlight, press the ON/OFF key.

The backlight will automatically shut-off after 25 seconds of non-use to save

the battery life.

The tag is housed in a rugged metal that can withstand harsh environments. However, it is better

to protect the tag from direct rain.

Place the tag near a sampling point. Fix it securely with the provided screws, in such a way that

the metallic iButton®is easily accessible for reading the tag.

The number of tags that can be installed is practically unlimited. Additional tags can be ordered

(See Accessories, page...) HI 920005 - five tag holders with tags).

LCD BACKLIGHT

TAG INSTALLATION

The instrument tungsten lamp has a life longer than 100,000 measurements. In case of lamp failure,

the defective lamp can be easily replaced. When the lamp is broken, the instrument displays “no L”

error message.

To replace the lamp follow the next steps:

•Remove the battery lid.

•Unscrew the lamp connection using a screwdriver.

•Unlock the lamp and extract it by pulling it out

from the lamp holder handler.

•Place the new lamp in the right position and

push it until is securely locked.

•Insert the lamp leads into the connector and

tight them using a screwdriver.

Warning: After lamp replacement the meter needs

to be recalibrated.

LAMP REPLACEMENT

Range 0.00 to 9.99 NTU

10.0 to 99.9 NTU

100 to 1200 NTU

Range Selection Automatically

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 1200 NTU

Accuracy ±2% of reading plus 0.05 NTU

Repeatibility ±1% of reading or 0.02 NTU, whichever is greater

Stray Light < 0.05 NTU

Light Source Tungsten filament lamp

Light Detector Silicon Photocell

Method Ratio Nephelometric Method.

Display 60 x 90mm backlit LCD

Calibration Two, three or four points calibration

LOG Memory 200 records

Serial Interface RS232 or USB 1.1

Environment 0 to 50°C (32 to 122°F); max 95% RH non-condensing

Power supply 4 x 1.5V AA alkaline batteries or AC adapter

Auto Shut-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.)

SPECIFICATIONS

SET INSTRUMENT ID

The instrument ID is a four digit number that can

be edited by the user. The instrument ID is

downloaded on the PC application, together with

the logged data. By setting a different ID for each

instrument it is possible to mix information from

many turbidimeters into the same database.

• To set the instrument ID, press CAL/RCL when

the “Set instrument ID” panel is displayed.

The default instrument ID is 0000. The existing

ID value and the CFM tag will start blinking.

•Press the UP or DOWN keys to set the new

instrument ID. By pressing and holding the UP

or DOWN keys, the changing speed wil increase.

• Press LOG/CFM to save the change. The new

instrument ID will be displayed.

Alternatively, press CAL/RCL to exit without

saving the changes.

SET BAUD RATE

The HI 83749 has a RS232 and a USB link. When

the USB connection is used, the RS232 connection

becomes inactive.

To successfully communicate with the PC, the same

baud rate must be selected on the instrument and

on the PC application. The available baud rates are

1200, 2400, 4800 and 9600.

• To set the baud rate, press CAL/RCL when the

“Set baud rate” panel is displayed.

The parameter value and the CFM tag will start

blinking.

• Press the UP or DOWN keys to select the new

baud rate value.

• Press LOG/CFM to save the change. The new

selected baud rate will be displayed.

Alternatively, press CAL/RCL to exit without

saving the changes.

8) ON/OFF: this is a bi-funcional key. Just press to turn the instrument on or to activate the back

light. Hold the key for 3 seconds to turn the instrument off.

9) GLP : press to enter/exit GLP (Good Laboratory Practice) feature. In Setup this key is used to

increase the set values. In Log Recall it is used to select a new record (scroll up).

10) AVG : press to select the AVG (Signal Average Mode) on and off. In Setup it is used to

decrease the set values. In Log Recall it is used to select a previous record (scroll down).

INSTRUMENT DESCRIPTION

FUNCTIONAL DESCRIPTION

1) Cuvet Lid.

2) Cuvet Holder.

3) Backlit Liquid Crystal Display (LCD).

4) Splash proof keypad.

KEYPAD DESCRIPTION

5) Lamp connector.

6) Lamp Holder.

7) Battery Compartment.

• Press LOG/CFM or READ to start editing the

day value. The day value will start blinking.

•Press the UP or DOWN keys to set the day value.

Note: to edit the year again, after the day was

set, press READ .

• Press LOG/CFM to save the new date. The new

date will be displayed on the LCD. Alternatively,

press CAL/RCL to exit without saving the changes.

SET THE TIME

• To set the current time, press CAL/RCL when the

“Set time” panel is displayed. The time format

is hh:mm. The hour value and “CFM” tag will

start blinking.

•Press the UP or DOWN keys to set the hour value.

• Press LOG/CFM or READ to start editing the

minutes. The minutes value will start blinking.

• Press the UP or DOWN keys to set the minutes

value.

Note: To edit the hour again, after the minutes

were edited, press READ .

• Press LOG/CFM to save the new time. The new

set time will be displayed.

Alternatively, press CAL/RCL to exit without

saving the changes.

DISPLAY DESCRIPTION

1) Battery icon. This icon appears when the status of the battery is displayed or when the battery

voltage is getting low.

2) Hour glass icon. It is displayed when the instrument performs an internal checkup.

3) Lamp and read status indicator.

4) Four digit main display.

5) NTU measurement units. When average or continuous mode is selected, the “NTU” tag blinks

for each new displayed value. For conversions in other units see Measurement Units section.

6) AVG icon appears when the Signal Average Mode is selected.

7) Four digit secondary display.

BEEPER

A long beep indicates an error or an invalid key pressed. A short beep means that the current

operation is confirmed.

11) CAL/RCL: this is a bi-functional key. Just press to enter/exit calibration or in setup mode to

start/stop editing a parameter. Hold the key for 3 seconds to enter/exit viewing log content.

12) LOG/CFM: press to save a record or to confirm the selected option.

13) SETUP/DEL: press to enter/exit setup. The DEL function is available in Log Recall mode to

delete one or all records. In GLP it is used to restore factory calibration.

14) READ : press to start a measurement. Hold the key to make a continuous measurement. In

Log Recall mode it is used to view the content of a record. In GLP it is used to view all

available information. In Setup, during date or time editing, it is used to select day, month or

year and hour/minutes.

CONNECTORS DESCRIPTION

15) AC adapter connector.

16) RS232 connector, to be used with serial

cable to trasfer data to PC.

17) Tag reader.

18) USB connector.

SHOW / HIDE THE TIME

You can choose between showing or hiding the

current hour and minutes on the secondary LCD.

•To set hiding or showing the time, press

CAL/RCL when the “Show/hide time” panel is

displayed.

The time show status and the CFM tag will start

blinking.

• Press the UP or DOWN keys to set Lcd / hide for

time.

• Press LOG/CFM to save the change. The new

selected option will be displayed on the LCD.

Alternatively, press CAL/RCL to exit without

saving the changes.

SET THE DATE

The HI 83749 turbidimeter has a built-in real time

clock (RTC). The RTC time is used to generate a

unique time stamp for each recorded value and to

automatically store the last calibration date. The

current time can be displayed on the LCD when the

instrument is in measurement mode.

• To set the current date, press CAL/RCL when the

“Set date” panel is displayed. The date format

is YYYY.MM.DD. The last two digits of the year

value and CFM tag will start blinking.

•Press the UP or DOWN keys to set the year value.

• Press LOG/CFM or READ to start editing the

month value. The month value will start

blinking.

• Press the UP or DOWN keys to set the month

value.

CUVET

The cuvet is part of the optical system and measurements can be affected by the glass imperfections,

dirt, dust, scratches, or fingerprints present on the cuvet surface.

CUVET HANDLING

•Any cuvet with visible scratches must be discarded.

•Always store the cuvets in separate boxes or with separators between them to avoid scratches on

the surface.

•Whenever a cuvet is placed into the instrument, it must be dry outside, free of fingerprints or

dirt. Wipe it thoroughly with HI 731318 (tissue for wiping cuvets, see Accessories Section,

page 39) or a lint-free cloth prior to insertion.

CUVET OILING

•

For low turbidity readings (<1.0 NTU) the cuvets should be oiled outside with the supplied

HI 93703-58 Silicone Oil. Use only one single drop of oil and then wipe the cuvet thoroughly

with

a lint-free cloth.

SAMPLING TECHNIQUE

When you make turbidity measurements it is important to take a representative sample.

•Gently mix the sample before filling the cuvet.

•Samples should be analyzed immediately after collection because turbidity can settle or change in

time.

• Pay attention when working with cold samples that no condense is formed on the outside of the

cuvet. We recommend to work always with samples at room temperature.

The instructions listed below should be carefully followed to ensure best accuracy.

GENERAL TIPS

•Always cap the cuvets to avoid spillage of the sample into the instrument.

•Always close the lid of the instrument during measurement.

•Keep the lid of the instrument closed when it is not used to prevent dust or dirt entering.

• Put always the instrument on a flat, rugged surface when taking measurements.

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

SET EPA COMPLIANCE MODE

When EPA compliance reading is on, “EPA” message

is displayed on the secondary LCD and the reported

values are rounded to meet EPA reporting

requirements.

• To edit the EPA mode, press CAL/RCL when EPA

compliance reading panel is displayed.

The parameter setting and “CFM” tag will start

blinking.

•Press the UP or DOWN keys to set the EPA

compliance mode on or off.

•Press LOG/CFM to save the setting. The new

selected option of the parameter will be

displayed on the LCD.

Alternatively, press CAL to exit without saving

the new settings.

SET BEEPER

The HI 83749 has a built-in beeper that signals

the tag read, the key press and the error conditions.

The beeper can be selected to be on or off.

• To set the beeper on or off, press CAL/RCL when

set beeper panel is displayed.

The beeper status and the CFM tag will start

blinking.

• Press the UP or DOWN keys to set the beeper on

or off.

• Press LOG/CFM to save the change. The new

selected option will be displayed on the LCD.

Alternatively, press CAL to exit without saving

the changes.

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