jenway 3505 Operating Manual
350 550/REV A/03-03
Model 3505
pH/mV/Temperature Meter
Operating Manual
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.
350 550/REV A/03-03
Model 3505
pH/mV/Temperature Meter
Operating Manual
Contents
Section 1 Introduction
Instrument Description 1.1
Instrument Specifications 1.2
Section 2 Installation
Unpacking 2.1
Installation 2.2
Displays/Controls 2.3
Inputs/Outputs 2.4
Section 3 Operation
Theory of pH Measurement 3.1
pH Measurement 3.2
Preparation of Buffer Solution 3.3
Solution Temperature Values 3.4
Good Practice Guidelines 3.5
pH Calibration Using Buffers 3.6
Performing Measurements 3.7
Section 4 Maintenance
General 4.1
Cleaning/Re-conditioning Combination
Electrodes 4.2
Section 5 Optional Accessories
Optional Accessories 5.1
Spares 5.2
Section 6 Troubleshooting & Functional Checks
Troubleshooting 6.1
Functional Checks 6.2
EC Declaration of Conformity
350 550/REV A/03-03
Section 1
Introduction
1.1 Instrument Description
The Model 3505 is a general purpose, laboratory pH/mV meter that uses rotary controls for mode
selection, pH calibration and manual temperature adjustment. Automatic Temperature
Compensation can be achieved by use of the ATC probe, which will enable the user to perform
temperature measurements within the range of 0 to 100°C.
The Model 3505 has a liquid crystal display and is battery operated. The use of an optional power
supply permits the unit to be operated from the a.c. mains supply.
1.2 Instrument Specifications
Range Resolution
-2.00 to 16.00pH 0.01pH
-1999 to +1999mV 1mV
Accuracy: pH: ±0.02pH
Millivolts: ±1mV
Temperature: ±0.5°C
Input Impedance: >1012ohms
Temperature
Compensation: Manual: -10 to 105°C 0.1°C
Automatic: 0 to 100°C 0.1°C
Calibration: Manual
Display: 25mm LCD
Power: 9V Battery (MN1604, PP3 or equivalent)
Outputs: Analogue buffered electrode potential
Size: 250(L) x 210(W) x 55(D)mm
Weight: 850g
350 550/REV A/03-03
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Section 2
Installation
2.1 Unpacking
Remove the Model 3505 from the packaging and ensure the following items are included:
1. Model 3505 pH/mV/Temperature meter
2. Epoxy bodied combination pH electrode (924 001)
3. ATC probe (027 500)
4. Electrode holder
5. 4, 7 and 10pH buffer sachets
6. BNC shorting plug (009 146)
7. Battery (PP3)
8. Condensed operating instructions (350 551)
9. Instruction manual (350 550)
Any shortages or damage should be reported immediately to the Manufacturer or your local
Distributor.
2.2 Installation
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The Model 3505 is supplied ready to use. Connect the ATC (if required) and the pH electrode to the
rear panel Temp and pH sockets.
The electrode stand requires minimal assembly (refer to the diagram below).
Fig. 2.2.1 - Electrode Holder Assembly
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2.3 Displays/Controls
Fig. 2.3.1 - Displays/Controls
1. Display Provides direct readout of pH, millivolts, temperature of
samples and standards and low battery indication.
2. Function Used for selection of mode of operation.
Switch Off - power off.
pH - pH measurement based on last calibration (the adjustment
controls have no function).
pH Cal - pH display based on settings of the adjustment
controls for buffer and slope.
°C - displays the measured temperature if an ATC probe is
connected, or the manually adjusted temperature (set by the
Slope/Manual temperature control).
mV - displays the electrode potential in mV.
3. Buffer Used to balance out the electrode offset between the pH
measurement cell and reference. This should be set with the
electrode immersed in pH7 buffer. This control adjusts the electrode effect
between -60mV to +60mV.
4. Slope Used to compensate for the variable sensitivity of pH
electrodes. As the electrodes age their sensitivity decreases
and this control is used to compensate for this. This control
adjusts the slope between 75% and 125% of Nernst.
5. Manual Temp When the °C mode is selected (without the ATC probe connected)
this control allows the compensation temperature to be set on the
display. This control becomes inoperative during use of the
ATC probe. The display will show the measured temperature if an ATC
probe is connected, or the manually adjusted temperature (set by the Slope/
Manual Temp control).
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