Jenway 9500 Instruction Manual

Model 9500

Dissolved Oxygen Meter

Operating Manual

950 050/REV A/04-03

SAFETY

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

1. The unit described in this manual is designed to 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. References should always be made to the Health & Safety data supplied with any chemicals used. Generally accepted laboratory procedures for safe handling of chemicals should be employed.

4. 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.

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Dissolved Oxygen Meter

Operating Manual

Contents

Section 1 Introduction

Instrument Description 1.1 Instrument Specification 1.2

Section 2 Installation

Unpacking 2.1 Installation 2.2 Displays 2.3 Keypad 2.4 Inputs/Outputs 2.5

Section 3 Operation

Good Practice Guidelines 3.1 Set Up Parameters 3.2 %DO2 Mode 3.3 B.O.D. 3.4 Status Page 3.5 Results Storage & Display 3.6 GLP Functions 3.7

Model 9500

Section 4 Maintenance

General 4.1 Probe Care & Maintenance 4.2

Section 5 Optional Accessories

Optional Accessories 5.1 Spares 5.2

Section 6 Interfacing

Analogue 6.1 RS232 6.2 Keypad Emulation 6.3 Printing 6.4 Alarm Outputs 6.5

Section 7 Troubleshooting

Troubleshooting 7.1

Health & Safety EC Declaration of Conformity

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Model 9500

Dissolved Oxygen Meter

Operating Manual

Section 1

Introduction

1.1 Instrument Description

The 9500 is a fully specified DO2/Temperature meter that includes full support for the B.O.D. 5-day test protocol. Up to 20 B.O.D. tests, each with up to 10 samples, can be stored. Powerful data logging capabilities are included, with the ability to store up to 250 DO2 readings either manually, at timed intervals or alarm events.

1.2 Specification

Ranges 0 to 199%./ 0 to 25.0% / 0 to 19.99mg/l Resolution 1%./ 0.1% / 0.01mg/l Accuracy ±2% within 10°C of calibration temperature Pressure correction Manual Salinity correction Manual

Temperature

Range -10 to +60°C (14 to 140°F) Resolution 0.1°C (1°F) Accuracy ±0.5°C (±1°F)

ATC Range 0 to 60°C (32 to 140°F) Manual Temp. Comp. Range 0 to 60°C (32 to 140°F)

Calibration Automatic Outputs Analogue

RS232 serial & IrDA printer interface Alarm

Clock 24 hours, hrs/min/sec or day of month/month/year

leap year corrected (European and American formats)

GLP Calibration reminder interval (1 to 999 hours)

Alarm outputs (open collector and audible)

Security code protected user data Display Back lit 1/8 VGA monochrome LCD Language option English, French, German, Italian, Spanish, Portuguese Power 9V power supply Size 210x250x55mm Weight 850g

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Section 2

Installation

2.1 Unpacking

Remove the Model 9500 from the packaging and ensure the following items are included:

1. Model 9500 Dissolved Oxygen Meter

2. Dissolved Oxygen probe with ATC (522 008)

3. 3 membranes & KCl solution (522 019)

4. Zero salts (983 030)

5. Adaptor bush

6. Electrode holder

7. Power Supply (as specified at time of ordering the product)

8. Condensed operating instructions (950 051)

9. Operating Manual (950 050) The electrode stand requires minimal assembly (refer to the diagram below)

Any shortages or damage should be reported immediately to the manufacturer or your local distributor.

2.2 Installation

The Model 9500 is supplied ready to use. Connect the dissolved oxygen probe to the rear panel DIN socket.

The electrode stand requires minimal assembly (refer to the diagram below).

Fig. 2.2.1 Electrode Holder Assembly

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Preparation for use

The probe is delivered with the membrane module detached. Prior to use the membrane module must be fitted to the probe body. A protective cap is also supplied. This should be fitted to the probe when not in use. The sponge contained within the cap should be wetted with deionised water prior to fitting. This covers the membrane and keeps it wet, thus preventing the electrolyte filling solution from drying out.

1. Remove the protective cap from the probe.

2. Take a membrane module and hold in the vertical position. Fill with the electrolyte solution

(5% KCl) supplied with the instrument.

3. Whilst still holding the module upright, screw the probe slowly down onto the thread, allowing

the excess electrolyte to escape through the screw thread. Ensure no air bubbles are present and that the membrane is not creased.

4. Connect the probe to the 9500 and turn on the instrument.

5. The complete probe and meter should be allowed to polarise for 30 minutes prior to

calibration.

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2.3 Displays

1. Primary display – 4½ digit. Provides direct readout in %DO2 , mg/l or BOD of samples and standards.

2. Mode annunciators – shows selected measurement mode; %DO2 , mg/l or BOD.

3. Secondary display – 3½ digit display. Provides direct readout of automatic or manual temperature. Also displays B.O.D. set up information when working in B.O.D. mode.

4. Mode annunciators – indicates temperature in °C or °F and whether the measurements are manually temperature compensated (MAN symbol).

5. Endpoint symbol – this symbol is displayed when an endpoint has been detected.

6. Mode tags – Each mode tag is highlighted when selected; SETUP, MODE (DO2, mg/l or B.O.D.), STATUS or RESULTS. If a double headed arrow symbol is present this indicates that the mode can be changed to an alternative option.

7. Real time clock - will display either date or time.

8. The following symbols will appear along the display in %DO2 and mg/l modes: Padlock - Set up parameters security locked

Notepad symbol - data logging to internal memory IrDA status Alarm indication - an Up arrow refers to Hi alarm / a Down arrow refers to Low alarm.

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2.4 Keypad

2.4.1 Keypad layout

1. ESC used to switch the instrument on and to place into standby mode (only if power supply lead remains connected to the instrument). Also used to escape/exit a mode.

2. CAL / CLR used to select and perform a calibration sequence. This key is also used to clear readings from Memory.

3. Print key used to initiate a print.

4. Up Arrow used for adjustment during set up, to scroll results and to toggle between modes.

Down Arrow used for adjustment during set up, to scroll results and to toggle between modes. Left Arrow used for adjustment during set up and to move between mode tags. Right Arrow used for adjustment during set up and to move between mode tags. STO used to accept an entered value in set-up mode and to instigate a stored reading.

This key can also be used as a CAL key during calibration.

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2.5 Inputs/Outputs Fig 2.5.1 Rear panel layout

1. Dissolved Oxygen 7 pin DIN socket for connection of DO2 probe.

2. Alarm Output 2 x 4mm sockets. Open collector alarm outputs. Red for Hi / Black for Low.

3. Printer Socket 9 way socket for RS232 connection.

4. Power In AC 9V I/P socket. 2.1 x 5.5mm socket allowing the power supply to be connected to the instrument.

5. Analog Out 2x4mm sockets. Analogue output.

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Section 3

Operation

3.1 Good Practice Guidelines

1. Ensure the membrane is kept wet at all times. When not in use the probe should be stored with the tip in a beaker of deionised water. For longer periods (overnight) the protective sheath should be fitted, with the sponge insert soaked in distilled water. This will prevent the electrolyte fill solution from drying out due to loss of water through the porous membrane. For extended periods store dry.

2. The probe is fitted with a temperature compensating element. This is housed underneath the silver ring on the probe body. Always ensure the probe is immersed in solution to a depth suitable to cover this ring. Allow sufficient time for these to respond if measuring samples with varying temperatures or where sample temperature is significantly different to ambient temperature.

3. Ensure the sample is moving across the membrane at a speed greater than 15cm/min to avoid oxygen starvation at the membrane. If the flow rate is insufficient then the sample should be stirred (e.g. either by a gentle stirring motion with the probe or with a magnetic stirrer).

4. When using the probe in liquors, sludges or polymers a coating may be deposited on the membrane, causing low response or drifting. This can be reduced by rinsing the probe in deionised water after each test.

5. Ensure the probe is rinsed in deionised water after each test.

6. When measuring in mg/l (ppm) results are pressure dependent and determinations carried out atpressures other than 760mm/Hg will need to be compensated.

7. When measuring in mg/l (ppm) results obtained from saline samples will need to be adjusted for salinity.

8. Ensure the probe is polarised prior to use (refer Operation). It is essential to perform this procedure after replacement of the membrane or probe.

9. When replacing the membrane ensure no air bubbles are trapped in the electrolyte fill solution and that the membrane is not creased or damaged after fitting. If the probe response is sluggish, or the readout is unstable after membrane replacement, clean the anode and cathode (refer Section 4.2 Maintenance).

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3.2 Set Up Parameters

The following section details the set-up modes available to the user on the main set up menu screen:

3.2.1 Instrument Setup

This option will allow the following parameters to be set:

Exit allows the user to exit this menu. Language enables the selection of the appropriate language – English, French,

German, Italian, Spanish or Portuguese. Use the Up/Down keys to scroll through thelanguage options.

LCD Brightness (%) enter the value using the keypad. Press the STO key to accept the value.

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3.2.2 Temperature Setup...

Select the Temperature Setup sub menu by highlighting the option and pressing the STO key. The following menu will be shown:

Temp units allows selection of the preferred unit of measurement (either °C or °F) using

the Up/Down keys which toggle between the two units.

Manual temperature allows the manual temperature value to be set. Press the STO key to

accept the value.

3.2.3 Calibration Set up …

This option allows the following parameters to be set:

Exit enables the user to exit the Setup menu and return to the main set up

screen.

Calibration %DO

allows the setting of %DO2 value for calibration between the limits of 0.1 to

199.9 using the Up/Down arrow keys.

Manual Pressure (bar) allows the setting of the current barometric pressure between the limits of

0.1 to 6.0bar using the Up/Down keys.

Manual Salinity (g/l) allows the setting of salinity values between the limits of 0.0 to 75.0.

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