Nelson-Jameson 926S Manuale utente

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 1 of 24

Model 926S

Chloride Analyzer

Operator’s

Manual

Nelson Jameson Inc.

2400E Fifth Street

Box 647

Marshfield

W.I. 54449

USA

Tel. 800 8268302

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 2 of 24

Contents

page

1 Introduction

1.1 Introduction ………………………………. 4

1.2 Summary of Test …………………….. 4

1.3 Reagents ………………………………. 5

Dilution

Storage

Purification

Instability

2 Installation

2.1 Electrical supply …………………….. 6

2.2 Unpacking ………………………………. 6

2.3 Assembly ………………………………. 7

3 Principles of operation

3.1 Description ………………………………. 8

4 Performance characteristics and specifications

4.1 Range ……………………………………….. 9

4.2 Accuracy ……………………………… 9

4.3 Linearity ……………………………… 9

4.4 Reproducibility ……………………………… 9

4.5 Stability …………………………….. 9

4.6 Response time …………………………….. 9

4.7 Measurement capacity …………………… 9

4.8 Samples …………………………….. 9

Type

Presentation

Volume

4.9 Readout …………………………….. 10

4.10 Warm up …………………………….. 10

4.11 Environmental conditions ………….. 10

Operation

Transportation

Installation category

4.12 Power requirements ……………………. 10

4.13 Size ………………………………………… 10

4.14 Weight ………………………………………… 10

5 Operating Instructions

5.1 Controls and indicators ……………………… 11

Condition

Titrate

Select Units

5.2 Rear panel components …………… 12

Power switch

Power

RS232 socket

USB A socket

USB B socket

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 3 of 24

Contents

Page

5.3 Operation ………………………………. 13

5.4 RS232 output and Printing …………... 14

5.5 USB B Output …........................................ 15

6 Operating precautions and hazards

6.1 Operating precautions ………………………. 16

6.2 Hazards ………………………………… 16

7 Quality control

7.1 General ………………………………… 17

7.2 Quality control checks ………………………. 17

8 Maintenance

8.1 General ………………………………… 18

8.2 Daily ………………………………………….. 18

8.3 Electrode cleaning and replacement ……. 19

9 Troubleshooting

9.1 Display not illuminated ……............. 20

9.2 On-screen messages ……............. 20

9.3 Non-reproducible results …………….. 20

9.4 Reproducibly high or low results …... 20

9.5 Non-reproducible results …................ 20

10 Spares and accessories

10.1 Ordering information ……………………… 21

10.2 Spares and accessories ……………. 21

11 Addendum A

Loading USB Drivers for PC’s running Windows 7 or earlier 22

12 Warranty statement …………………………………………. 23

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 4 of 24

1 Introduction

1.1 Introduction

The M926S is a direct reading, digital chloride analyzer. It is designed for fast and

accurate determinations of Chloride levels in samples for which determination in

mmol/l is required.

Sample volume is 100µl or 20µl and results are displayed on a digital readout in

mmol/l (millimoles per litre) Chloride.

This manual presents complete instructions for setting up and using the M926S. A

short time spent familiarising yourself with these instructions will be more than repaid

in satisfactory operation.

The M926S is intended for use by persons knowledgeable in safe laboratory

practices. If the M926S is not used in accordance with these instructions for the

protection provided by the equipment may be impaired.

A Service Manual is available as an optional extra, for use by appropriately qualified

technical personnel. Please refer to Section 10.2.

1.2 Summary of the Test

The M926S is used for the determination of chloride ions. It is an instrumental

analogue of ”Argentimetry”, the traditional titrimetric methods using Silver Nitrate

reagent. Like these classical methods it relies on the chemical formation of the very

insoluble salt, Silver Chloride. The importance of chloride determination has been

realised for well over a century, with many variations and changes being made to the

techniques in order to improve the detectability and selectivity. Research into the

analysis of chloride was conducted by Gay-Lussac (1832), Levol (1853), Mohr (1856)

and Volhard (1874) and their findings have proven to be the basis of the methods that

are still in common use today.

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 5 of 24

Introduction

continued

1.3 Reagents

The following solutions are recommended for use with the M926S. Ordering

information is given in Section 10.2.

NOTE All reagents contain preservatives where required.

Standard Solution is 100mmol/l Chloride as Sodium Chloride.

Combined Acid Buffer Solution is a support electrolyte consisting of a mixture of

Acetic and Nitric acids which maintains the correct pH for the complete cycle of

titrations, and a colloid to hold precipitated silver chloride in suspension.

WARNING Acid Buffer is an irritant –avoid contact with skin. Wash exposed

areas with water.

Dilution

No dilution is required for Nelson Jameson reagents.

Storage

Solutions should be stored away from direct sunlight in a cool place, preferably with

an ambient temperature below 25°C (77°F). Do not use solutions after the expiration

date shown on the bottle. Do not return decanted contents to the original bottle. Caps

of standard solution bottles must be done up firmly to prevent evaporation.

Purification

No purification or treatment is required when using these reagents.

Instability

Never leave bottles of Standard Solution uncapped as prolonged exposure to the

atmosphere will affect the solution’s concentration.

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 6 of 24

2 Installation

2.1 Electrical Supply

The M926S operates at low voltage (12 Volts d.c.). The universal mains adapter

supplied with the M926S comes with a range of plugs to suit most a.c. supplies

around the world. The a.c. supply can be in the range 100 –240V, 50 –60Hz.

2.2 Unpacking

Upon receipt, the M926S should be removed from its carton and inspected for

damage. Contact your Nelson Jameson representative if any items are missing or

damaged.

1. Lift out the accessory tray.

2. Lift the instrument out of the polythene cover on to a bench.

3. Check the instrument and all the items in the carton for signs of damage.

Check items received against the following list and notify your Nelson

Jameson representative if any discrepancies are discovered.

IMPORTANT Quantities shown in the following list are those supplied with a new

instrument. DO NOT re-order from this list; instead refer to Section 10 of this

manual.

Part No. Description Quantity

001 53 313 Universal mains adapter 1

001 09 006 USB lead, A (M) –B (M), 1.8m 1

780-3756 Chloride Standard Solution, 100mmol/l Cl, 1 x100ml 1 bottle

780-3730 Silver Electrode Polish 1 vial

131-3751 Combined Acid Buffer Solution, 1 x 500ml 1 bottle

780-3910 1 x Cathode, 2 x Detector Electrode, set of 3 1 set

780-3911 Anodes, pack of 3 1 pack

780-3010 Beaker, plastic, graduated at 14ml, Nelson Jameson 2

780-3950 Stirrer 1

Chloride Analyzer M926S mkIII 1

780-3051 Lead, M926 to Printer/Computer 1

926 91 018 Operators Manual M926S 1

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 7 of 24

Installation

continued

2.3 Assembly

1. Fit the two shorter, sleeved electrodes into the two rear positions on the

underside of the electrode head, Item 3, Figure 2.1. Ensure both electrodes

are pushed firmly into their sockets behind the protective rubber boots.

Figure 2.1 Electrode Head

1. Cathode, 2. Anode, 3. Detector electrodes, 4. Stirrer.

2. Insert the stirrer through the stirrer hole and push it firmly into its coupling, as

shown in Figure 2.1, Item 4.

3. Insert the cathode (un-sleeved, short electrode) through the left-hand hole and

push it firmly into its socket, as shown in Figure 2.1, Item 1.

4. Fit an anode (70mm long electrode) through the remaining hole into its socket.

5. Check that the three shorter electrodes are all fully inserted and then adjust the

position of the anode so that all four electrodes are the same length.

6. Position the M926S so that there is clear access to the on/off switch (Item1,

Figure 5.2, p.12).

7. The universal mains adapter supplied with the M926S comes with a range of

plugs to suit most a.c. supplies around the world. Choose and fit the one that

suits your local electricity supply.

8. Refer to Section 5 of this manual for detailed operating instructions.

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 8 of 24

3 Principles of Operation

3.1 Description

An accurately measured volume of sample (100µl or 20µl set by the 'select' button on

the front panel) is added to an acid buffer. The M926S automatically titrates chloride

ions by passing a known constant current between two silver electrodes which

provides a constant generation of silver ions. These silver ions combine with the

chloride in the sample to form silver chloride, which is held in suspension by the

colloid stabiliser. During the titration period the digital readout is updated

approximately every 0.3 seconds. During these periods the number of silver ions

introduced into the sample combine with one unit measurement of chloride. When all

the chloride has been precipitated as silver chloride, free silver ions begin to appear

and the solution conductivity changes. This change is detected by the detector

electrodes and the readout is stopped, displaying the results directly in millimoles per

litre of Chloride. Another sample may now be added to the same acid buffer and the

cycle repeated. The digital display is held until starting another cycle, when it is

automatically reset to zero.

NOTES

1. The M926S uses an absolute method of operation and is calibrated at the

factory. Recalibration should only be necessary after changing internal

electronic components.

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 9 of 24

4 Performance Characteristics and Specifications

4.1 Range

10 to 299mmol/l Chloride.

4.2 Accuracy

Results will be within ±2mmol/l (at the 100mmol/l level) of the values obtained by

standard wet-chemical methods after allowing for pipetting errors.

4.3 Linearity

Results will be within ±1mmol/l in the range 10 to 299mmol/l or ±1% concentration

value whichever is the greater.

4.4 Reproducibility

The values obtained from 20 consecutive titrations of a nominal 100mmol/l solution

will give a coefficient of variance of ≤ 1.5%.

4.5 Stability

The calibration level (mean of five titrations of a standard solution) will change by less

than ±2 Least Significant Digits over the life of any silver anode.

4.6 Response Time

A stable reading will be displayed within 26 seconds of pressing the ‘titrate’ button, at

a concentration level of 100mmol/l.

4.7 Measurement Capacity

Twenty samples at 100µl or 20µl sample volume, per reagent change.

4.8 Samples

Type

Chloride in solution, having low ionic strength, neutral pH and free of silver halides,

silver reactive constituents (other than chloride), solid matter and high levels of

dissolved solids.

Presentation

By pipette directly into the beaker of Nelson Jameson Combined Acid Buffer.

Volume

100µl or 20µl –user selectable.

SH-001051-ML Issue 10 92691018 Nelson Jameson M926S Operator Manual

Issue Date: 19 Oct 2021 ECN 3727 & 4453 Page 10 of 24

Performance Characteristics and Specifications

continued

4.9 Readout

Measurement results are shown in characters 15mm high on a 2.75” 60 dpi backlit

LCD screen. Separate areas of the display are reserved for measurement units and

instrument status information.

4.10 Warm Up

Five minutes warm up is required to meet the stated specification.

4.11 Environmental Conditions

Operation

Temperature range +10°C to +35°C

Maximum relative humidity 85% at +35°C (non condensing)

Transportation

Temperature range -40°C to + 45°C

Maximum relative humidity 95% at +45°C

Compliance with the stated specification will be unaffected by a change in ambient

temperature up to 4°C per hour, provided the operating temperature range is not

exceeded.

Installation Category

Installation category 1.

4.12 Power requirements

Mains adapter Input

100V –240V ~, 50Hz –60Hz, 0.6A

Mains adapter Output

12V …1.25A

4.13 Size

Width 200mm (7”)

Depth 250mm (9.8”)

Height 315mm (12.4”)

4.14 Weight

1.9kg (4.2lbs)

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