Jenway 7300, 7305 Instruction Manual

Model 7300 and 7305 Spectrophotometer

Operating Manual

730 005 REV E/12-14

Safety

Please read this information carefully prior to installing or using this equipment.

1. The unit described in this manual is designed be operated only by trained personnel. Any adjustments, maintenance and repair must be carried out as defined in this manual, by a person qualified to be aware of the hazards involved.

2. It is essential that both operating and service personnel employ a safe system of work, in addition to the detailed instructions specified in this manual.

3. Other than for those items defined in the maintenance procedures herein there are no user serviceable items in this instrument. Removal of covers and attempted adjustment or service by unqualified personnel will invalidate the warranty and may incur additional charges for repair.

4. References should always be made to the Health and Safety data supplied with any chemicals used. Generally accepted laboratory procedures for safe handling of chemicals should be employed.

5. If it is suspected that safety protection has been impaired in any way, the unit must be made inoperative and secured against any intended operation. The fault condition should immediately be reported to the appropriate servicing authority.

Merci de lire attentivement ces informations avant d'installer ou d'utiliser cet appareil.

1. L'appareil décrit dans ce manuel est conçu pour être utilisé uniquement par des personnes formées. Tout réglage, maintenance ou réparation doit être effectué comme décrit dans ce manuel, par une personne qualifiée consciente des risques encourus.

2. Il est essentiel que les personnes utilisant et intervenant sur cet appareil respectent les règles de sécurité de travail, en plus des instructions détaillées précisées dans ce manuel.

3. En-dehors des éléments décrits dans les procédures de maintenance ci-incluses, cet appareil ne contient aucun élément réparable par l'utilisateur. L'enlèvement des capots et les tentatives de réglage ou de réparation par des personnes non qualifiées invalide toute garantie et entraîne un risque de frais de réparation supplémentaires.

4. Toujours se référer aux fiches techniques de santé et de sécurité accompagnant tout produit chimique utilisé. Respecter les procédures de laboratoire généralement acceptées pour la manipulation en toute sécurité des produits chimiques.

5. Si l'utilisateur suspecte qu'un problème quelconque puisse mettre en cause la sécurité, l’appareil doit être rendu inopérant en empêchant son utilisation. Communiquer la défaillance constatée au service de maintenance compétent.

Bitte lesen Sie diese Hinweise vor Installation oder Gebrauch dieser Ausrüstung sorgfältig durch.

1. Das in diesem Handbuch beschriebene Gerät darf nur von geschultem Personal bedient werden. Alle Anpassungen, Wartungsarbeiten und Reparaturen müssen entsprechend der Vorgaben in diesem Handbuch und von einer kompetenten Person, die mit den damit verbundenen Gefahren vertraut ist, durchgeführt werden.

2. Es ist wichtig, dass sowohl das Bedienungs- als auch das Service-Personal zusätzlich zu den detaillierten Anweisungen in diesem Handbuch ein sicheres Arbeitssystem einsetzen.

3. Mit Ausnahme der Teile, deren Wartungsverfahren in diesem Handbuch beschrieben sind, enthält dieses Gerät keine weiteren Teile, die vom Benutzer gewartet werden können. Das Entfernen von Abdeckungen und Versuche von hierfür unqualifiziertem Personal, Anpassungen oder Wartungsarbeiten durchzuführen, haben zur Folge, dass die Garantie verfällt und können zusätzliche Reparaturkosten auslösen.

4. Es ist jederzeit auf die sicherheitsrelevanten Daten sämtlicher verwendeter Chemikalien Bezug zu nehmen. Allgemein anerkannte Labormethoden zum sicheren Umgang mit Chemikalien sollten eingesetzt werden.

5. Besteht der Verdacht, dass die Sicherheitsvorrichtungen in irgendeiner Weise beschädigt wurden, muss das Gerät außer Betrieb genommen und gegen weiteren Gebrauch gesichert werden. Die Störung sollte der zuständigen Serviceeinrichtung unverzüglich gemeldet werden.

Leggere attentamente queste istruzioni prima di installare o utilizzare il dispositivo.

1. L'unità descritta nel presente manuale è stata realizzata per essere utilizzata solo da personale che ha ricevuto l'apposita formazione. Qualsiasi operazione di regolazione, manutenzione e riparazione deve essere effettuata sulla base di quanto indicato nel presente manuale da personale qualificato consapevole dei rischi connessi.

2. È fondamentale che il personale operativo e il personale addetto alla manutenzione utilizzino un sistema di lavoro sicuro, oltre a seguire le istruzioni specificate nel presente manuale.

3. Oltre a quelli indicati nelle procedure di manutenzione, all'interno di questo dispositivo non sono presenti altri elementi sui quali è possibile effettuare interventi. La rimozione delle protezioni e qualsiasi tentativo di regolazione o di manutenzione posto in essere da personale non qualificato invaliderà la garanzia. In questi casi, sarà necessario pagare un importo per le riparazioni effettuate.

4. È sempre necessario fare riferimento ai dati sulla salute e sulla sicurezza forniti con le sostanze chimiche utilizzate. Adottare le procedure di laboratorio generalmente accettate per la gestione delle sostanze chimiche.

5. Nel caso in cui si sospetti che la salute possa essere pregiudicata in qualsiasi modo, disattivare l'unità per renderla inutilizzabile. Qualsiasi condizione di errore deve essere immediatamente segnalata al responsabile per la manutenzione.

Lea esta información atentamente antes de instalar o utilizar este equipo.

1. La unidad descrita en este manual está diseñada para que solamente la utilice personal con formación. Cualquier operación de ajuste, mantenimiento y reparación debe llevarse a cabo del modo indicado en este manual y debe realizarla una persona cualificada que sea consciente de los peligros que implica.

2. Es fundamental que tanto los operarios como el personal de servicio utilicen un sistema de trabajo seguro, así como las instrucciones detalladas que se especifican en este manual.

3. Cualquier elemento que no se encuentre entre los definidos en los procedimientos de mantenimiento aquí descritos no podrá utilizarse en este instrumento. La extracción de las tapas y los intentos de ajuste o reparación por parte de personal no cualificado invalidarán la garantía y pueden incurrir en cargos adicionales por reparación.

4. Siempre deberían consultarse los datos sobre Salud y Seguridad que se suministran con cualquier producto químico que se utilice. Es necesario llevar a cabo los procedimientos de laboratorio de aceptación generalizada para la manipulación segura de productos químicos.

5. Si existe la sospecha de que las medidas protectoras de seguridad han quedado dañadas en cualquier modo, la unidad debe inutilizarse y protegerse contra toda operación que se intente llevar a cabo. El estado de fallo debe comunicarse inmediatamente a la autoridad de servicio de mantenimiento y reparación pertinente.

Contents

Safety ......................................................................................................................... 3

Contents ..................................................................................................................... 6

SECTION 1 - Introduction .......................................................................................... 8

1.1 INSTRUMENT DESCRIPTION............................................................................................. 8

1.2 INSTRUMENT SPECIFICATION.......................................................................................... 8

SECTION 2 – Installation ........................................................................................... 9

2.1 UNPACKING......................................................................................................................... 9

2.2 INSTALLATION .................................................................................................................... 9

2.3 DISPLAY ............................................................................................................................. 10

2.4 CONTROLS ........................................................................................................................ 11

2.5 REAR PANEL ..................................................................................................................... 12

2.6 FRONT PANEL ................................................................................................................... 12

SECTION 3 – Theory and Practice of Spectroscopy Measurements ....................... 13

3.1 THEORY OF SPECTROSCOPY MEASUREMENT .......................................................... 13

3.2 SPECTROSCOPY MEASUREMENT ................................................................................. 14

3.3 GOOD PRACTICE GUIDELINES ....................................................................................... 15

SECTION 4 – Instrument Setup ............................................................................... 17

4.1 NAVIGATING AND SCREEN SETUP ................................................................................ 17

4.2 TIME AND DATE ................................................................................................................ 18

4.3 INSTRUMENT SETTINGS MENU...................................................................................... 18

4.4 SCREEN CONTRAST ........................................................................................................ 19

4.5 LAMP SAVE........................................................................................................................ 19

SECTION 5 – PHOTOMETRICS ............................................................................. 21

5.1 MODE SPECIFIC PARAMETERS ..................................................................................... 21

5.2 METHOD SET UP .............................................................................................................. 21

5.2.1 Selecting a Wavelength ...................................................................................................... 21

5.3 CALIBRATION .................................................................................................................... 22

5.4 SAMPLE MEASURMENT ................................................................................................... 22

SECTION 6 – CONCENTRATION ........................................................................... 23

6.1 MODE SPECIFIC PARAMETERS ..................................................................................... 23

6.2 METHOD SETUP ............................................................................................................... 23

6.2.1 Selecting a Wavelength ...................................................................................................... 23

6.2.2 Settings ............................................................................................................................... 24

6.2.2.1 Selecting Concentration Units ............................................................................................ 24

6.2.2.2 Changing the Resolution .................................................................................................... 25

6.2.2.3 Using a Standard ................................................................................................................ 25

6.2.2.4 Using a Factor .................................................................................................................... 25

6.3 CALIBRATION .................................................................................................................... 26

6.3.1 Calibrating to a Standard .................................................................................................... 26

6.3.2 Calibrating to a Factor ........................................................................................................ 27

6.4 SAMPLE MEASUREMENT ................................................................................................ 27

6.4.1 Measuring a Sample After Calibrating to a Standard ......................................................... 27

6.4.2 Measuring a Sample After Calibrating to a Factor ............................................................. 27

6.5 POST MEASUREMENT OPTIONS .................................................................................... 27

6.5.1 Changing Concentration Units ............................................................................................ 28

6.5.2 Changing the Concentration Factor .................................................................................... 29

6.5.3 Changing the Calibration Standard Value .......................................................................... 29

SECTION 7 – PRINTING AND AUTOLOGGING ..................................................... 30

7.1 PRINTING ........................................................................................................................... 30

7.1.1 Print Setup .......................................................................................................................... 30

7.1.2 Printing Results ................................................................................................................... 31

7.2 AUTOLOGGING ................................................................................................................. 31

7.2.1 Setting the Number of Sample Repetitions ........................................................................ 31

7.2.2 Selecting Result’s Destination ............................................................................................ 32

7.3 CONNECTING TO A PC .................................................................................................... 33

SECTION 8 – Accessories and Spare Parts ............................................................ 34

8.1 OPTIONAL ACCESSORIES............................................................................................... 34

8.2 CONNECTING THE ACCESSORIES ................................................................................ 34

8.2.1 Internal Printer .................................................................................................................... 34

8.2.2 Passive Accessories ........................................................................................................... 35

8.2.2.1 Water-heated cuvette holder .............................................................................................. 35

8.2.3 Active Accessories .............................................................................................................. 38

8.2.3.1 Automatic 8 cell turret ......................................................................................................... 38

8.2.3.2 Peltier .................................................................................................................................. 39

8.2.3.3 Sipper pump ....................................................................................................................... 40

8.2.3.4 Combined sipper Peltier pump ........................................................................................... 42

8.3 USING THE ACCESSORIES ............................................................................................. 43

8.3.1 Automatic 8 cell turret ......................................................................................................... 43

8.3.2 Peltier .................................................................................................................................. 43

8.3.3 Sipper pump ....................................................................................................................... 44

8.3.3.1 Manual Sipper Pump Settings ............................................................................................. 45

8.3.3.2 Timed Sipper Pump Settings ............................................................................................... 46

8.3.4 Combined sipper Peltier pump ........................................................................................... 49

8.4 SPARES ............................................................................................................................. 49

SECTION 9 – Maintenance and Service .................................................................. 50

9.1 ROUTINE MAINTENANCE ................................................................................................ 50

9.2 LAMP REPLACEMENT ...................................................................................................... 50

9.2.1 Tungsten Halogen Lamp Replacement .............................................................................. 50

9.2.2 Xenon Lamp Module Replacement .................................................................................... 51

9.3 SERVICE ............................................................................................................................ 51

SECTION 10 – Troubleshooting ............................................................................... 52

10.1 ERROR CODES ................................................................................................................. 52

10.2 TROUBLESHOOTING GUIDE ........................................................................................... 54

10.3 TECHNICAL SUPPORT ..................................................................................................... 54

SECTION 11 – Declaration of Conformity ................................................................ 55

SECTION 1 - Introduction

7300

7305

Wavelength

Range

320 to 1000nm

198 to 1000nm

Resolution

1nm

Accuracy

± 2nm

Repeatability

± 0.5nm

Spectral bandwidth

5nm

Photometrics

Transmittance

0 to 199.9%

Absorbance

-0.300 to 2.500A

Accuracy

±1%T, ±0.01Abs at 1.000 Absorbance

Resolution

0.1%T, 0.001A

Stray light

<0.5% at 340nm

<0.5% at 340nm and 220nm

Stability

<0.002Abs/hr after 30 minute warm up

<0.001Abs/hr without warm up Concentration

Range

-300 to 9999

Resolution

Selectable 1/0.1/0.01/0.001

Calibration

Blank with a single standard or factor

Units

no units, %, ppm, EBC, SRM, mEq/l, mEq, M, mM, µM, nM, U, U/l,

U/ml, g/l, mg/l, µg/l, ng/l, g/dl, mg/dl, µg/dl, mg/ml, µg/ml, ng/ml, µg/µl,

ng/µl, mol/l, mmol/l

Factor

0.001 to 10000

Standard

0.001 to 1000

Other

Beam height

15mm

Light source

Tungsten halogen lamp

Xenon lamp

Lamp save

Yes

Not applicable

GLP

Current time and date

Outputs

Analogue, RS232, Internal printer

Power

24V

Size (w x d x h)

275 x 400 x 220mm

Weight

6kg

1.1 INSTRUMENT DESCRIPTION

The 7300 and 7305 spectrophotometers are suited to a wide range of applications in education, quality control, environmental and clinical analysis. The 7300 is a visible spectrophotometer covering a wavelength range from 320nm to 1000nm. The 7305 is a UV/Visible spectrophotometer with a wavelength range from 198nm to 1000nm. Both models feature measurement modes for absorbance, % transmittance and concentration. These instruments use icon driven software and have an improved navigation system for easy and intuitive usability.

1.2 INSTRUMENT SPECIFICATION

SECTION 2 – Installation

2.1 UNPACKING

Remove the 7300 or 7305 from the packaging and ensure the following items are included:

1. Model 7300 spectrophotometer (730 001), or Model 7305 spectrophotometer (730 501)

2. 24V 65W power supply unit (021 060)

3. 7300 - Pack of 100 disposable plastic visible wavelength cuvettes (060 084), 7305 - Pack of 100 disposable UV plastic cuvettes (060 230)

4. Jenway 73 series PC software (735 100) and interface cable (013 203)

5. Instruction manual (730 005)

6. Jenway Foreign Manual CD (JENMANCD)

7. Optional accessories (as ordered)

2.2 INSTALLATION

Models 7300 and 7305 are supplied ready to use. The unit should be placed on a clean flat surface which is free from drafts and vibrations. The

units are designed for operation on 90V to 264V AC input at 47 to 63Hz. Select the correct plug attachment and attach to the power supply unit as shown below:

Fig 2.2.1 – Power supply unit with various plugs

Connect the power supply unit to the power inlet socket on the rear panel of the instrument and connect to the mains socket. Turn the power on at the mains and switch the instrument on using the power switch on the rear of the instrument.

The instrument will perform several power on tests before displaying the main menu:

1. Instrument check – ensures the validity of the saved parameters

2. Dark test

3. Checks for the accessory fitted. If an active accessory is found the instrument verifies communication and response

4. Self-calibration of wavelengths

2.3 DISPLAY

These spectrophotometers have a dot matrix display which enables icons to be displayed clearly. Following successful completion of the power on tests the main menu screen will be displayed:

Fig 2.2.2 – All Power On Tests Complete

Fig. 2.3 – Display

2.4 CONTROLS

The keypad used for these models enables an easy and effective way of navigating the different measurement modes, entering numbers, saving and analysing results. The soft keys are active when an icon is displayed above or adjacent to the key. The only exception to this is the back key which is always active.

The main menu screen and surrounding keypad is displayed below.

1. Photometrics measurement mode

2. Back key

3. Time and date menu

4. Instrument settings menu

5. Concentration measurement mode

Fig. 2.4 – Display

2.5 REAR PANEL

1 2 4

The image below shows the rear panel on the instrument:

Fig. 2.5.1 – Rear Panel

1. Lamp access panel Allows access to lamp when replacement is necessary

2. Power switch On/off switch for the unit

3. Power in socket Connection socket for power supply unit

4. RS232 serial port Connection to a PC or external serial printer

5. Output sockets Analogue output

2.6 FRONT PANEL

The image below shows the front panel of the instrument:

Fig. 2.6.1 – Front Panel

1. Integral printer (optional accessory)

2. Keypad

3. Instrument lid

4. Display

SECTION 3 – Theory and Practice of Spectroscopy Measurements

Where:

Io is the incident light It is the transmitted light

l is the path length

3.1 THEORY OF SPECTROSCOPY MEASUREMENT

UV-visible spectroscopy is the measurement of the absorbance of light at a specific wavelength in a sample. This is used to identify the presence and concentration of molecular entities within the sample. The Beer-Lambert law is used to relate the absorption of light to the properties of the

sample through which the light is travelling through. The Beer-Lambert law states that:

A is the absorbance

is the molar absorption coefficient (l mol-1cm-1)

c is the concentration (mol l-1) l is the path length (cm)

This law shows that absorbance is linear to concentration but this is only true for low concentrations. For absorbance levels above 3 the concentration starts to move away from the linear relationship.

Transmittance is the proportion of the light which passes through the sample:

Therefore:

T =

Absorbance is inversely related to transmittance:

𝟎

A = Log

3.2 SPECTROSCOPY MEASUREMENT

There are four main components of a spectrophotometer. These are a light source to emit a high and constant amount of energy over the full wavelength range; a method for separating the light into discreet wavelengths; a sample holder and a light detector.

The optical layout of the 7300 and 7305 spectrophotometers is shown below:

Figure 3.2.1 – Diagram of light path

The light from the pre-focused tungsten halogen (7300) or pre-aligned xenon (7305) lamp is focused onto the grating, with 1200 lines per millimeter, which separates the light into discreet wavelengths. The diffracted spectrum of light then passes through a further slit and lens arrangement before passing through the sample in the sample chamber from left to right. The light which is not absorbed by the sample is transmitted through a collecting lens and onto the signal detector. The photo-diode detector used is mounted directly onto the detector PCB and is used to calculate the % transmittance. The result is displayed either as % transmittance or absorbance on the instrument display.

3.3 GOOD PRACTICE GUIDELINES

1. For optimum performance all spectrophotometers should be sited in a clean, dry, dust

free atmosphere. When in use ambient temperature and light levels should remain as constant as possible.

2. If required adherence to Standard Operating Procedures (SOP) and Good Laboratory

Practice (GLP) should be monitored with regular calibration checks and a suitable Quality Control (QC) programme.

3. The sample chamber lid must be fully closed during measurement and before any

readings are recorded or printed.

4. The correct selection of sample containers is imperative for accurate and

reproducible results: a) Check that the material of the sample container is compatible with the

wavelengths to be used for measurement. In general glass can only be used down to 360nm or 320nm depending on quality. Standard plastic cuvettes can be used down to 320nm. Special UV versions can be used down to 260nm. Below

this level quartz cuvettes must be used. b) Plastic disposable cuvettes should only be used ONCE. c) Glass cuvettes should be thoroughly cleaned after use. Discard when scratches

become evident on optical surfaces. d) Care should be taken when selecting semi-micro or micro cuvettes. The cuvette

window on the inner chamber (the area filled with sample) must be wider than the

aperture in the sample holder or light will reach the detector without passing

through the sample. In this case, semi-micro or micro cuvettes with self-screening

black surrounds must be used or, alternative holders for these cuvettes should be

used. e) Glass test tubes and other sample tubes should be used with care. Where

possible, matched tubes should be used and any index mark set to the correct

position before measurements are made. f) Ensure any sample containers used are compatible with the constituents of both

the samples and standards they are to hold. Plastic cuvettes are not compatible

with organic solvents. g) All sample containers must be handled with care; by the top, bottom and non-

optical surfaces only. Any finger marks evident must be removed by a suitable

cleaning process. h) Flow-through cuvettes must be selected with care and consideration for the

sample type, sample volume, pumping system, rinse, sample and waste handling

to be used.

5. Samples and standards should not be stored in open cuvettes or sample containers as evaporation will change the value and lead to staining of the walls which may be irreversible. If stored in stoppered and sealed cuvettes, they should be filled with little or no air space and the values regularly checked against a reference standard or quality control material.

6. Samples should be allowed to equilibrate to ambient temperature before measurement (unless a suitable temperature controlled sample holder is in use). Temperature change during measurement may cause air bubbles to form on the walls of the sample holder. This is a common cause of drift during measurement.

7. In the preparation of samples and standards high grade borosilicate glass and AR grade chemicals and reagents must be used. Good quality deionised water or other suitable solvents must be used for dissolving or diluting samples, chemicals and reagents.

8. All measurements require calibration to a blank, for maximum accuracy this should be prepared with care using the same deionised water or solvent used for dissolving or diluting the sample. Where reagents are added to the sample to produce a colour

proportional to its concentration a ‘sample based’ blank should be used. In this case

the blank should consist of all reagents or chemicals to be used, except the sample which will produce the colour to be measured.

9. Deviations from the Beer-Lambert Law may occur at high and low concentrations giving non-linear response during sample concentration measurements. For all new methods a linear range should be defined by the preparation of a calibration curve.

10. Cuvettes and sample holders must be filled to a minimum level which covers the light path. All Jenway spectrophotometers have a beam height of 15mm.

11. The instrument must be calibrated to zero absorbance/100% transmittance prior to taking readings.

SECTION 4 – Instrument Setup

To navigate around the spectrophotometer screen press the soft keys adjacent to icons displayed on the screen. In the main menu either of the two soft keys adjacent to the measurement mode icon can be pressed to access the mode. There is a back key which returns to the previous menu without saving any changes.

The main menu screen provides access to the measurement modes, the time and date menu and the instrument settings menu. The measurement modes are photometrics and concentration. The instrument settings menu enables access to the screen contrast and lamp save menus.

Operating Menu

(Photometrics measurement mode)

When a measurement mode is selected the operating menu is opened. This menu enables changes to be made to the measurement parameters and method settings. The measurement settings can be accessed through the utility toolbar displayed on the left hand side of the operating menu. This toolbar provides the same functions in all of the measurement modes. The utility toolbar enables access to printing, print setup

options and autologging options. For more details on the different functions of the utility toolbar refer to section 7.

4.1 NAVIGATING AND SCREEN SETUP

The main menu screen is displayed below.

Fig 4.1 – Home Screen

4.2 TIME AND DATE

The time and date menu enables the current time and date to be set. This information will be saved on all results and displayed on printouts. The time and date menu can be accessed from the main menu by holding the key below the time and date icon for 2 seconds. Pressing the key once cycles the display between time and date.

In the time and date menu to set the time press the key adjacent to the clock icon. Select the digit to be changed using the keys at the bottom of the screen. Use the keys adjacent to the arrow icons to increase or decrease the number. The clock function uses a 24 hour format.

In the time and date menu to set the date press the key adjacent to the calendar icon. Select the digit to be changed using the keys at the bottom of the screen. Use the keys adjacent to the arrow icons to increase or decrease the number. The date format can be displayed as either European dd/mm/yy or American

mm/dd/yy. To change between the two formats press the key below the toggle icon. Once the current time and date have been set press the key adjacent to the tick icon to save the changes. To exit this menu without saving any changes press the back key and the screen will return to the main menu.

The instrument settings menu is accessed by pressing the key below the instrument settings icon in the main menu. This menu enables access to screen contrast and lamp save menus. The tick icon saves any changes made and returns to the main menu.

Lamp save

Screen contrast Tick

4.3 INSTRUMENT SETTINGS MENU

Fig 4.3 - Settings Menu

4.4 SCREEN CONTRAST

The screen contrast function enables the brightness of the screen to be set. In the instrument settings menu press the key adjacent to the screen contrast icon. Use the keys below the arrow icons to increase or decrease the screen contrast. Once the required brightness level has been reached press the key adjacent to the tick icon to save and return to the instrument settings menu.

This function is only available on the 7300 visible spectrophotometer which uses a tungsten halogen lamp.

The lamp save function enables the time in minutes to be set after which the lamp will be turned off following a period of no lamp activity, i.e. no readings have been performed. This function is accessed through the instrument settings menu by pressing the key adjacent to the lamp save icon.

When this menu is first accessed the lamp save is turned off. To activate the lamp save function press the key below the lamp save icon. To deactivate the lamp save function press the key below the lamp save icon.

The default minimum time is set to 30 minutes. Select the digit to be changed using the keys at the bottom of the screen. Use the keys adjacent to the arrow icons to increase or decrease the number. Once the required time in minutes has been set press the key adjacent to the tick icon to save and return to the instrument settings menu.

4.5 LAMP SAVE

+ 43 hidden pages

Jenway 7300, 7305 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual