Honeywell Lumidor Impact, Impact Pro Operating Manual

Impact and Impact Pro

Operating Instructions

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HELP US TO HELP YOU

Every effort has been made to ensure the accuracy in the contents of our documents, however, Zellweger Analytics Limited can assume no responsibility for any errors or omissions in our documents or their consequences.

Zellweger Analytics Limited would greatly appreciate being informed of any errors or omissions that may be found in the contents of any of our documents and to this end we include the following form for you to photocopy, complete and return to us so that we may take the appropriate corrective action.

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HELP US TO HELP YOU

To: Marketing Services,

Zellweger Analytics Limited, Hatch Pond House, 4 Stinsford Road, Nuffield Estate, POOLE. Dorset. BH17 0RZ. United Kingdom.

Tel: +44 (0) 1202 676161 Fax: +44 (0) 1202 678011 email: literature@zelana.co.uk

US Office Tel: +1 954 514 2700 Toll free:+1 800 538 0363

From :

Address :

Tel : Fax : email :

I suggest the following corrections/changes be made to:

Chapter ........... Section ...........

Marked up copies attached (as appropriate): Yes / No

Please inform me of the outcome of this change: Yes / No

For Marketing Services, Zellweger Analytics Limited:

Actioned By: Date:

Response: Date:

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GENERAL STATEMENT OF LIMITED WARRANTY

This publication contains information partly derived from proprietary data of Zellweger Analytics. The main objective of this information is to assist in the operation and maintenance of the instrument described herein. The publication of this information does not convey any right to reproduce or use the information for any purpose other than in the operation or maintenance of the equipment described herein.

Zellweger Analytics shall not be liable for any incidental or consequential damages in connection with any deletions, errors or omissions in this Manual.

All products are designed and manufactured to the latest internationally recognised standards by Zellweger Analytics under a Quality Management System that is certified to ISO9001. As such Zellweger Analytics warrants its products against defective parts and workmanship as detailed below.

1. Zellweger Analytics Limited will repair or (at its option) replace any Contract Goods which are or may become defective under proper use within the following timescales from Delivery where such defects solely arise from faulty design materials or workmanship (Other than a design made furnished or specified by the Buyer) provided such defective goods are returned by the Buyer within the requisite time limits set out below at its expense to Zellweger Analytics Limited's premises, which returned goods must detail the Service Event Number (SE#) clearly on the package and the Buyer shall obtain an SE# by telephoning Zellweger Analytics Limited Service Department.

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GENERAL STATEMENT OF LIMITED WARRANTY

2. All products 12 months from delivery (date of original despatch to the buyer) with the following exceptions:

Impact multigas detector

24 months from delivery

Impact disposable OFCH cartridge

12 months from date of installation into Impact instrument provided installation takes place before the stated ‘INSTALL BY’ date on the cartridge packaging

3. Any such defective goods returned in accordance with the provisions of this clause must be accompanied by a detailed report stating the nature of the defect with the SE#. If no such report is included then Zellweger Analytics Limited reserve the right to charge a £50 (Sterling)/$75 (US dollars) investigative fee before any repair or replacement is carried out.

4. The warranties set out in this clause are non pro rata, i.e. the initial warranty period is not extended by virtue of any works carried out there under.

5. Where it is impractical to return any defective goods to Zellweger Analytics Limited’s premises then Zellweger Analytics Limited should be notified by writing within the relevant warranty period referred to above and upon being so notified Zellweger Analytics Limited will despatch a service engineer to site on a day rate basis (details available upon request) and if such goods are found to be defective hereunder then they will be repaired or replaced free of charge but day rate charges for the service engineer will apply.

6. Subject to the provisions of this clause Zellweger Analytics Limited shall not be liable for any loss or damage whatsoever or howsoever occasioned which may be a direct or indirect result of the use or operation of the Contract Goods by the buyer or any Party.

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GENERAL STATEMENT OF LIMITED WARRANTY

7. This warranty covers instrument and parts sold to the Buyer only by authorised distributors, dealers and representatives as appointed by Zellweger Analytics Limited.

8. This warranty does not cover consumable items or items likely to wear in normal operation including but not limited to dry-cell batteries, filters and fuses.

9. The liability of Zellweger Analytics Limited under this clause shall be in lieu of any warranty or conditions implied by law as to the quality or fitness for any particular purpose of the Contract Goods and (save as provided in this clause) Zellweger Analytics Limited shall not be under any liability whether in contract tort or otherwise in respect of any defects in the Contract Goods or for any injury (other than personal injury caused by Zellweger Analytics Limited’s negligence as defined by Section 1 of the Unfair Contract Terms Act 1977) damage or loss resulting from such defects or from work done in connection therewith.

10. This warranty supersedes all existing warranty statements and Zellweger Analytics Limited make no other warranty expressed or implied except as stated above.

11. If a claim is made against Zellweger Analytics Limited in respect of Liability under the Consumer Protection Act 1987 in circumstances where a like claim could have been made against the Buyer in contract the buyer should indemnify Zellweger Analytics Limited in full against all damages costs and expenses that may become payable as the result of such claim.

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TOTAL ENVIRONMENTAL SOLUTIONS

Ensure that you read and understand these Operating Instructions BEFORE installing or operating any part of the equipment.

Please pay particular attention to the Safety Warnings.

The dry cell battery holder part no. 2302B0371 or rechargable battery pack part no. 2302B0842 must not be removed, replaced or recharged in the hazardous area.

Only the following alkaline dry cell batteries must be used in the dry cell holder part no. 2302B0371.

Duracell MN1500 or Energizer Intelligent E91.

Rechargeable cells must not be used in the dry cell battery holder part no. 2302B0371.

WARNINGS

Do not mix rechargeable battery packs and dry cell battery packs.

The instrument must be serviced only by qualified personnel trained by Zellweger Analytics or by a Zellweger Analytics Appointed agent. Servicing must be carried out only in a non-hazardous area.

The Impact must not be used in an oxygen enriched atmosphere.

Refer to Section 4. OPERATION for details of restrictions of use of the IMPACT/IMPACT PRO

The Flammable Sensor requires an oxygen content of greater than 10%v/v to operate reliably. In circumstances where the oxygen content of the sample is less than 10%v/v, the reading displayed on the Flammable Channel should be regarded as suspect. In this situation, a Warning 54 (Low O

- Flam Inaccurate) will be generated on the

instrument.

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TOTAL ENVIRONMENTAL SOLUTIONS

WARNINGS

The Flammable Sensors sensitivity can be adversely affected by exposure to certain substances (silicon and sulphur compounds are examples). Every effort should be made to avoid exposure to these substances. Following an H

S alarm or repeated gassing with H2S a check should

be performed on the Flammable sensor to verify its accuracy and a calibration performed if necessary.

If -0.0 %V/V for the CO2 sensor channel is permanently displayed, a sensor zero calibration needs to be performed in clean air. The alarm level A1 for the CO exceed 0.5 %V/V.

range must not

Do not calibrate the CO

channel if CO2 is indicated in clean

air after the apparatus has been exposed to CO concentrations above the upper limit of the measuring range. In this case leave instrument in clean air overnight before calibration.

The calibration interval for the CO2 sensor shall not exceed 1 month.

Dispose of the spent cartridge and its packaging in accordance with local regulations. Do not dispose of in fire.

IMPORTANT NOTICE

Zellweger Analytics Limited can take no responsibility for installation and/or use of its equipment if this is not done in accordance with the appropriate issue and/or amendment of the relevant manual.

The user of this manual should ensure that it is appropriate in all detail to the exact equipment to be installed and/or operated. If in doubt, the user should contact Zellweger Analytics Limited for advice.

If further details are required which do not appear in this manual, contact Zellweger Analytics Limited or their agent.

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Note: The failure to observe and abide by the above Warnings

and Cautions may render void the intrinsic safety approval of the IMPACT/IMPACT PRO, and may remove any right of claim against Zellweger Analytics relating to product liability or consequential damage to any third party.

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CONTENTS

Section Page

Contents

1. INTRODUCTION 16

1.1 Intended use 17

1.2 Product overview 18

2. GETTING STARTED 20

2.1 How to turn Impact/Impact Pro on and off 20

2.2 Inserting the cartridge 21

2.3 Charge for first use 22

2.4 Dry-cell Battery insertion 25

2.5 Sampling 26

3. INSTRUMENT START-UP 28

3.1 Instrument information 28

3.2 Selecting location / operator 29

3.3 Fresh Air Auto zeroing sensors 29

3.4 Sensor Warm-up Phase 30

4. OPERATION 31

4.1 Monitoring Condition 31

4.1.1 Display Screens 31

4.1.2 Other Displayed Symbols 33

4.1.3 Confidence Signal 34

4.1.4 Go/No Go Option 34

4.2 Atmospheric alarm conditions 35

4.3 Alarm condition 36

4.3.1 Latching Alarms (default) 36

4.3.2 Non-latching Alarms 36

4.3.3 Vibrating alarm (where fitted) 36

4.3.4 Resetting an Alarm 37

4.4 Fault and Warning Condition 37

4.4.1 Warning 37

4.4.2 Fault condition 38

4.5 Safelink 38

4.5.1 What is Safelink? 38

4.5.2 Using Safelink 39

4.6 PUMP (IMPACT PRO ONLY) 42

4.6.1 Removal of the Pump Adaptor 47

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CONTENTS

Section Page

4.7 Menus 47

4.7.1 Flammable Gas Selection 48

4.7.2 Operator 49

4.7.3 Calibration 50

4.7.4 Instrument Details 50

4.7.5 Safelink 51

4.7.6 Language 51

4.8 Datalogging 51

4.8.1 Installing the PC Software 52

4.8.2 Event Datalogging 52

4.8.3 Gas Datalogging (optional) 53

4.8.4 Output Formats 53

4.9 Calibration 54

4.9.1 Contaminants 54

4.9.2 Flow Calibration – Instrument 56

4.9.3 Flow Calibration – PC 61

4.9.4 Enforcer Calibration 62

5. FAULT FINDING AND PROCEDURES 64

6. ACCESSORIES 65

6.1 Basestation 65

6.2 Basestation Plinth 66

6.3 Basestation PSU Link Cable 66

6.4 Offline Trickle Charger 67

6.5 Power supply for Basestation and Trickle Charger 67

6.6 Enforcer 68

6.7 Enforcer gas cylinder 68

6.8 Flow adaptor 69

6.9 Metal Belt Clip 69

6.10 Instrument Webbing Clip 69

6.11 Body Harness Kit 70

6.12 Pump Adaptor Kit 70

6.13 10m Sample Tube Kit 70

6.14 Earpiece 71

6.15 Basestation PC Link Cable 71

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CONTENTS

Section Page

6.16 Safelink Cable Assembly 71

6.17 Safelink Cable Restraint Clip 72

6.18 Hand Aspirator Kit 72

6.19 Sensing Probe 1m 73

6.20 Ball float 73

7. ROUTINE MAINTENANCE 74

7.1 Cleaning 74

7.2 Filters 74

7.3 Battery charging / replacement 75

7.3.1 Rechargeable Battery Pack 76

7.3.2 Dry cell 77

8. ROUTINE SERVICING 78

8.1 Serviceable Cartridges 78

9. SPARE PARTS 96

10. GLOSSARY 97

11. APPENDIX A 101

11.1 Warning Codes 101

11.2 Fault Codes 104

12. APPENDIX B 106

12.1 Warranty 106

12.2 Certification Approvals 106

12.2.1 DMT Test Report 107

12.2.2 Safelink Connection Drawing 110

12.3 Technical Specifications 111

12.3.1 Instrument Specification 111

12.3.2 Charger Specifications 112

12.3.3 Specific Speed of Response Data

(Rising Gas Levels) 113

12.3.4 Specific Recovery Time Data

(Falling Gas Levels) 114

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INSTRUMENT LABELS

EQUIPMENT LABEL

An explanation of the information on the equipment label is shown below.

Manufacturers Trademark & Address

Poole BH17 0RZ, UK

Impact Unit Part No. 2302B1000XXX

User Cautions

CAUTION:

Comms Connection only to other certified Impact detectors in hazardous area Read and understand instruction manual before operating or servicing Replace/Recharge batteries only in Non Hazardous area Refer to Manual for battery types

CENELEC (ATEX) CERTIFICATION LABEL

An explanation of the information on the Cenelec (ATEX) certification label is shown below.

Product Name

Explosion Protection Mark and Equipment Group Category

Certified Ambient Temperature Range

EU Explosive Atmosphere Symbol and Certification Code as EN50014: 1992

DMT Approval

CE Mark Conforms to all EC Directives

Certification No.

Identification No. of ATEX

Notified Body

Australian Surface Approval

Australian Mines Approval

Brazilian Approval

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INSTRUMENT LABELS

This instrument has been assessed by DMT for performance of Oxygen, Methane, Propane, Carbon Monoxide, Hydrogen Sulfide and Carbon Dioxide channels.

The label marking indicates this:

DMT 02 ATEX G 001

PFG Nr. 41300502

The instrument has been tested in accordance to the following European Standards.

• EN50054 & EN50057: 1998 for Combustible Gases

(Methane and Propane).

• EN61779-1: 2000 for Combustible Gases (Methane and

Propane) and EN61779-4: 2000.

• EN50104: 1998 for the measurement of Oxygen.

• EN45544-1 & EN45544-2: 1999 for the measurement of

Carbon Monoxide, Hydrogen Sulfide and Carbon Dioxide.

• EN50271: 2000 for the assessment of Digital Components

and Software.

WARNING

Assessment has only been made in the range of 0 to 100%LEL. Use of other ranges of flammable gas measurement on this instrument will invalidate this approval.

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UL / CSA Approval

User Warning

Product Name

2302M5030

INSTRUMENT LABELS

UL / CSA CERTIFICATION LABEL

An explanation of the information on the UL / CSA certification label is shown below.

WARNING

Only the combustible gas detection portion of this instrument has been assessed by CSA for performance. Furthermore assessment has only been made in the 0 to 100 %LEL scale. Use of other ranges of flammable gas measurement on this instrument will invalidate approval.

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1. INTRODUCTION

The Impact / Impact Pro is a compact, portable gas monitor designed to be carried or worn without hindering the user. Its purpose is to monitor the atmosphere continuously for hazardous levels of up to four gases. These concentrations if gases are measures using Zellweger Analytics sensors. Audible and visual alarms alert the user to danger when hazardous conditions are detected

The instrument is usually supplied with four gas sensors, for detecting oxygen (enrichment and deficiency), flammable gases (up to the Lower Explosive Limit) and two toxic gases (for personal safety) all housed in an easily replaceable cartridge.

Various sensor technologies are used to achieve this. In the vast majority of cases, electrochemical technology is used to detect oxygen and toxic gases while catalytic combustion technology is used to detect flammable gases.

Two types of cartridge are available. One is disposable where the cartridge has a fixed life and once this has expired the cartridge is disposed of. The other is a Serviceable Cartridge where the sensors can be individually replaced when required. The serviceable cartridge type can only be used in the Impact Pro.

Note: Throughout this manual it is assumed that the Impact /

Impact Pro is equipped with a Disposable Four Sensor Gas Cartridge. References to sensors not fitted in the users instrument should be ignored. This manual covers all models - some features are not available on all models. Not all models are available in every country.

The instrument is supplied with dry cells and holders as standard. Rechargeable batteries and charger can be purchased separately as a kit.

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1. INTRODUCTION

1.1 INTENDED USE

The Impact/Impact Pro has been designed to alert the user to potentially hazardous atmospheres whilst carrying out his/her normal duties. Therefore, the instrument must be kept switched on and worn as close to the breathing area as possible, and several accessories are provided to allow the instrument to be worn in a number of different ways:

a. On the chest b. On a belt c. Attached to a body harness

The instrument is provided with various methods to enable the user to comply safely and easily with confined space regulations.

CAUTIONS

Hand aspirated remote sampling only provides continuous gas readings as long as the bulb is being operated.

Zellweger Analytics recommend that the instrument be calibrated at least every 6 months or in accordance with customer site procedures, whichever is sooner. Correct operation of the instrument should be confirmed with test gas of known concentration before each use.

channel if

Do not calibrate the air after the apparatus has been exposed to concentrations above the upper limit of the measuring range. In this case leave the instrument in clean air overnight before calibration.

The calibration interval for the 1 month.

The use of Enforcer calibration accessory is strongly recommended as it enables this to be performed quickly and easily.

is indicated in clean

sensor shall not exceed

WARNING

A sensor which cannot be calibrated or which is found to be out of tolerance should be replaced immediately. For the disposable cartridge a replacement cartridge must be fitted.

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1. Buttons

2. Pump Aperture

3. Cartridge and Filter Cover

4. Audible Aperture

5. Grille Cover Screws

6. Certification Label

7. Battery Covers

8. Data Connector

9. Tool

▲ (yellow) Moves up through menu screens, and used to increase values

✔ (green) used as ‘OK’ in

menus. Accepts alarms, and resets peak values

(red) On/Off button. Also used as ‘change’ in menus.

▼ (yellow) Moves down through menu screens, and used to decrease values

2302M5030

1. INTRODUCTION

1.2 PRODUCT OVERVIEW

On the top of the unit are four buttons (1). Their functions are summarised below:

Pressing any key will automatically activate the display backlight for 10 seconds.

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1. INTRODUCTION

There are currently two types of instrument available - Impact and Impact Pro. The main differences between the two instruments is that the Impact Pro supports a range of Serviceable Cartridges (see Section 8.1 Serviceable Cartridges of this manual). The other detail differences are the addition of an internal sample pump, vibrating alarm and Safelink feature.

The instrument can be further personalised by use of the Impact Configuration Utility (ICU) PC software, which can be purchased separately as part of the Data Logging Kit. This allows the user to change various settings and features of the instrument including, but not limited to Alarm Levels, Autozero function, latching alarms, vibrating alarm (where fitted), data logging settings and Safelink messages.

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2. GETTING STARTED

2.1 HOW TO TURN IMPACT/IMPACT PRO ON AND OFF

The Impact has been designed for ease of use, and especially for one-handed operation - only a single button is needed to turn it on and off.

• To turn the instrument on, press the button until the

instrument activates its audible and visual alarms. It will follow the start-up sequence described in Section 3. INSTRUMENT START-UP.

If the instrument displays an error that no cartridge is fitted then follow the procedure in Section 2.2 Inserting the cartridge.

• To turn the instrument off, press and hold the button for

three seconds, until it switches off. Note that on some models a password must be entered to switch the unit off. Failure to enter the correct password will cause the instrument to continue as though the button had not been pressed.

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2. GETTING STARTED

2.2 INSERTING THE CARTRIDGE

(1) If the instrument is switched on then switch it off by

pressing and holding the button. Note: if a cartridge is already fitted, check that the instrument clock is correct. If it is not, change the instrument clock as described in section 4.1.1.

(2) Undo the two grille cover screws (5).

(3) If a cartridge is already fitted then remove it by undoing

the central screw.

(4) Insert new cartridge into aperture as shown. Ensure that

the point ‘★’ is located correctly in the pump or moulding (depending on model).

(5) Gently tighten up the central screw to secure in place.

(6) Check the condition of the filter on the grille cover (3),

and if necessary, replace it.

(7) If the unit is fitted with a pump replace the pump seal.

★

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2. GETTING STARTED

(8) Replace the front cover, and retighten the two screws

(5).

(9) Wait at least 20 minutes. Then switch the Impact on by

pressing the button and check no faults are reported by the instrument. If fault 4 occurs refit the cartridge.

(10) Once the new cartridge is fitted the instrument will

compare it to the cartridge fitted previously. The instrument will alert the user with warning if:

a) the alarm levels are different

b) the number of sensors is different

c) the mix of the sensors is different.

(11) If the instrument reports a gas alarm, switch instrument

off, wait 20 minutes, and switch unit on again.

2.3 CHARGE FOR FIRST USE

Either a rechargeable battery pack or a dry-cell battery source can power the Impact. For the rechargeable battery it must be charged before first use, to replace any battery capacity used during transit and storage.

(1) Ensure the basestation is connected to a suitable power

source.

(2) Place the instrument in the basestation.

The basestation employs a locking mechanism to ensure that the Impact is retained under most operating conditions. To ensure this operates correctly the following procedure should be followed:

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2. GETTING STARTED

a) Ensure that the Impact is orientated such that the

instrument lip will be inserted under the locking lip.

b) Insert the front of the Impact at an angle such that

the instrument lip slides under the locking lip

Instrument lip

Locking lip

Front

Rear Front

Closeup detail

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(Disengaged) Rearlocking catch (Engaged)

2302M5030

2. GETTING STARTED

c) Push down on the rear of the Impact such that the

rear locking catch engages.

d) To remove the Impact press down on the rear

locking catch.

All 4 alarm lights will flash indicating the Impact has started charging.

(3) Whilst charging the instrument, the instrument will flash

2 red LEDs approximately every 2 seconds. When charging is complete it will light the green LEDs constantly. A pair of fully discharged battery packs will require 7 hours to recharge fully.

WARNING

Do not charge the battery pack in a hazardous area.

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2. GETTING STARTED

2.4 DRY-CELL BATTERY INSERTION

(1) Undo the two battery compartments (7) using the tool

(9) provided, on the bottom of each instrument.

(2) Release each dry-cell battery holder and remove the

cells if fitted.

(3) Insert new cells, ensuring correct orientation by

checking that the negative terminal is at the same end as indicated on the moulding. Ensure they are of the correct type, to comply with the intrinsic safety requirements.

(4) Replace dry-cell holders in the battery compartments,

and retighten cover screws.

(5) Instrument is now ready for use.

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2302M5030

2. GETTING STARTED

2.5 SAMPLING

In normal operation the Impact is worn on the belt, with its harness, or held by hand. Once turned on the Impact monitors the atmosphere continuously, which reaches the sensors by diffusing through the vents of the grille cover or by being pulled through by the internal pump (if fitted). For non-pump instruments normal air movements are sufficient to carry the sample to the sensors, and the sensors react immediately to changes in concentrations of the gases being measured in the atmosphere immediately surrounding the detector. Depending on your application and the options fitted to the instrument the environment can be sampled remotely in a variety of ways, as summarised below:

No pump Flow hood Hand

With pump Pump adaptor Sampling 1m

aspirator

Sampling Ball float

tube

tube sensing

probe

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2. GETTING STARTED

CAUTIONS

Hand aspirated remote sampling only provides continuous gas readings while the bulb is being squeezed. Each time a reading is required, it is necessary to squeeze the bulb at a rate of one per second until the readings remain stable.

When using the built-in pump ensure that the sampling tube is not inserted into a fluid.

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English

Language

French

Italiano

Deutsch

Español

French

Language

Deutsch

Español

Italiano

Nederlands

Flammable Gas

Methane

Oxy Flam

CO H2S

Calibration Due

in 120 days

2302M5030

3. INSTRUMENT START-UP

3.1 INSTRUMENT INFORMATION

After turning the instrument on it will display the information in the following autosequence (depending on model):

The first display identifies the model. Whilst this is shown the alarms are tested, If a vibrating alarm is fitted this is also activated. Whilst this screen is displayed, pressing the button will cause the instrument to identify the version of software installed and the instrument serial number.

A Language Selection Screen is then shown (first use only). Use the

▲ and

▼ buttons to highlight the required

language and press the

✔ key to

make the selection. Note that some of the languages may be 'off screen' use the

▲ and ▼ buttons to access

these.

The language can be changed at a later time, if required. See section

4.7.6 for details.

The display then shows the gas that the flammable sensor is set to monitor, the sensors fitted and when the calibration is due (if the calibration is due in less than 30 days).

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Location

Default Location

Operator

Default Operator

✓ - OK

- Change

Zero sensors?

✓ - OK

- No

2302M5030

3. INSTRUMENT START-UP

The instrument logs data on the operator’s exposure, if any, to measured toxic gases. It achieves this by requesting the operator to confirm his/her identity and the location where the instrument is being used. The screen displays the last location and operator. If these are acceptable then press the

✔ button. Otherwise select

a new location and/or operator.

3.2 SELECTING LOCATION / OPERATOR

To change the location and/or operator press the button and the display will show the current location. Press the

▼ buttons to cycle through the list. Once the correct location

has been found then press

✔, and follow the same procedure

to select the operator.

▲ and

3.3 FRESH AIR AUTO ZEROING SENSORS

If enabled the instrument will prompt if you wish to zero the sensors in fresh air, to adjust for any natural drift that may have occurred. If the ✔ button is pressed the instrument will then ask the user to ensure that it is being zeroed in fresh, uncontaminated air.

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Are you in

fresh air?

✓ - Yes, - No

2302M5030

3. INSTRUMENT START-UP

If the ✔ button is pressed the

Note: This is a ‘soft’ zero. Any adjustments only remain in

force whilst the instrument is switched on. To permanently adjust the zero, the zero via the calibration menu must be used (‘hard zero’).

instrument will zero the sensors automatically, and display whether the procedure was successful. The oxygen reading will be adjusted to

20.9%v/v – the other sensor readings will be adjusted to 0 ppm and 0%lel appropriately. If the button is pressed instead the instrument will use its current zero values instead and proceed to the monitoring screen.

3.4 SENSOR WARM-UP PHASE

Following display of the Autozero screen it will be noted that the message 'Cell Self Test Please Wait' is displayed. This is displayed while the sensors are in the warm-up phase of the start-up procedure. If the option of Autozero is declined the main gas measuring screen will be displayed with the message 'Warm Up' being displayed in place of the gas concentration readings. The instrument should not be used until the 'Warm Up' message has disappeared. The amount of time that the sensors are in warm up will depend on the sensor type. Table 12.3.1 in section 12 of this manual gives details of the warm up times for each of the sensors.

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4. OPERATION

Note: Wherever the manual says ‘select’, the procedure is to

use the

▲ and ▼ buttons to cycle through the list, and

then press

✔

to select the required option.

4.1 MONITORING CONDITION

4.1.1 Display Screens

With no alarm conditions the display will typically show:

The gas sensors and their respective units are displayed, complete with a battery gauge monitor at the bottom. For an instrument fitted with less than four sensors each unused sensor position will show ‘---‘.

Several data screens are available and these can be viewed by pressing the

▲ and ▼ buttons to cycle through. The symbol

in the centre of the screen will identify which screen is active.

Peak Screen ( )

This symbol is displayed when the instrument is displaying the peak readings for the sensors, i.e. the highest readings seen since the instrument was switched on or since they were reset. This is useful for preentry checks for confined space entry. These readings can be reset by pressing the

✔ button whilst this

display is shown.

This screen will alternate with a screen showing the minimum value of oxygen. In this case the is replaced by .

020.9

0 0

02CO%V/V

ppm

Flam

H2S

%LEL

ppm

020.9

0 0

02CO%V/V

ppm

Flam

H2S

%LEL

ppm

▲

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4. OPERATION

STEL Screen ( )

This symbol is displayed when the instrument is displaying the STEL readings for the toxic sensors. The STEL is a time weighted average, measured over a 15 minute reference period. It is used to monitor exposure to toxic gases in line with current regulations and/or legislation. Until 15 minutes has elapsed these are projected values.

LTEL Screen ( )

This symbol is displayed when the instrument is displaying the LTEL (TWA) readings for the toxic sensors. The LTEL is a time weighted average, measured over an 8 hour reference period. It is used to monitor exposure to toxic gases in line with current regulations and/or legislation. Until the Impact has been monitoring continuously for 8 hours these are projected values.

Status Screen

This screen shows the current time, date and battery status.

It is possible to change the instrument clock setting as follows: Press the

✔

key while this screen is displayed and the clock setting function will be activated, with the hour field highlighted. Use the

▲ and ▼ keys to change the value as

required and press the

✔ key to move to the minute field.

Again use the

▲ and ▼ keys to change the value and continue

until all of the fields have been correctly set. Finally press the

✔ key to store the changes. Note that the key can be

pressed at any time to abort the procedure.

0 0

CO ppm

H2S

ppm

0 0

CO ppm

H2S

ppm

18:33:00

22/Jan/2001

MAN0597 ISSUE 09 - 12/05 2302M5030

4. OPERATION

4.1.2 Other Displayed Symbols

If the pump is operating correctly the pump symbol will rotate.

If the pump flow becomes blocked the instrument will warn the user and stop the pump to prevent potential damage. When the user accepts the warning message the instrument will attempt to restart the pump. There is no need to remove and refit the Pump Adaptor. At this point, the user should investigate the cause of the blockage alarm. If the blockage is cleared then the pump will successfully restart. If the blockage is still present then the instrument will again warn the user that the pump flow is still blocked. This will repeat until the blockage is removed.

This shows an approximation of the remaining battery capacity within the instrument. If there is less than 20 minutes remaining battery life then the instrument will display a ‘Low Battery’ warning.

This will be shown instead of the numerical reading for any sensor or channel that is faulty, if a zero or span calibration has failed, in instances of low oxygen and in some cases of high gas concentrations. Switch the instrument off and then back on. If this does not clear the fault then recalibrate the sensor or change the cartridge.

020.9

0 0

02CO%V/V

ppm

Flam

H2S

%LEL

ppm

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4. OPERATION

This indicates that the sensor output of the indicated

-0

If -0.0 Vol.% for the CO2 sensor channel is permanently displayed, a sensor zero (during boot procedure) or a zero calibration needs to be performed in clean air. The alarm level A1 for the CO

channel has drifted negative. In severe cases of sensor negative drift, a Warning 51 (Excessive Negative Drift) will be shown. Please see Appendix A – Warning Codes for further details on this warning message.

WARNING

range must not exceed 0.5 Vol.%.

4.1.3 Confidence Signal

To ensure correct operation the instrument monitors itself and will confirm correct operation by giving an audible and green visual confidence signal once every 30 seconds. The confidence signal is given when the instrument is able to detect gas (for example the confidence signal will not be given during pump or sensor calibration phases, or if the sensors are in warm-up).

There is a configurable option to silence the audible confidence signal but the visual confidence signal will still operate. If the instrument is in a low battery condition the confidence signal will occur twice every 30 seconds.

Note: The audible confidence signal is the primary indication

that the instrument is functioning correctly. It is therefore strongly recommended that this feature not be disabled.

4.1.4 Go/No Go Option

A configurable option is available which replaces the numeric values with a there is or has been an alarm or fault, as shown below. All alarms operate as normal, but other functions and menus are disabled.

✔ symbol when everything is OK and ✘ when

MAN0597 ISSUE 09 - 12/05

✓

✗

2302M5030

4. OPERATION

This display now also shows the battery capacity as follows.

The Go / No Go Option is configured using the Impact Configuration Utility (ICU) PC software from the Configuration Screen.

4.2 ATMOSPHERIC ALARM CONDITIONS

CAUTION

The Impact portable gas detector has been designed for the detection of oxygen deficiencies and enrichments, flammable gas and toxic gas levels. An alarm condition indicating the presence of one or more of these potentially life-threatening hazards should be taken seriously.

In the event of an alarm is activated when the measured gas concentration exceeds the pre-set alarm point.

A rapid increase in reading followed by a declining or erratic reading may indicate a hazardous combustible gas concentration that exceeds the measuring range of the Impact (i.e. greater than 100%LEL or 5.0%v/v Methane). In the event of the instrument being exposed to a very high level of flammable gas the following behaviour will be noted.

• Warning 54 (Low O indicated. This warning will be latched.

• Warning 52 (sensor over-range) and an alarm condition will be indicated.

• The flammable reading will be latched to 100%LEL or

5.0%v/v Methane with an alternating cross on the channel.

For other sensors reading greater than the measurement range, ‘ displayed.

▲▲▲’ alternating with the full-scale reading will be

) and an alarm condition will be

MAN0597 ISSUE 09 - 12/05

02CO%V/V

ppm

Flam

H2S

%LEL

ppm

1 2

2302M5030

4. OPERATION

4.3 ALARM CONDITION

There are two modes of alarm: latching and non-latching. However, the display will give the same alarm indication:

An alarm symbol will appear in the relevant section of the display. The alarm symbol contains a number,

indicating the increasing severity of the alarm, with increasing frequency of the audible and visual alarms. If there is a STEL/LTEL alarm the relevant icon will appear and flash.

Any alarm will cause the backlight to be switched on automatically.

4.3.1 Latching Alarms (default)

In the latched condition, once an alarm occurs both audible and visual alarms continue to operate even after the atmospheric hazard has cleared. Pressing any of the instrument buttons will clear an alarm. Any subsequent alarm will reactivate the audible and visual alarms.

4.3.2 Non-latching Alarms

In this mode, should a gas alarm occur the instrument would enter an alarm condition. When the readings return to normal levels the audible and visual alarms will stop.

4.3.3 Vibrating alarm (where fitted)

If this option is fitted to the instrument any alarm condition that activates the audible and visual alarms will also activate the built-in vibrating alarm.

MAN0597 ISSUE 09 - 12/05

WARNING

Code - 0

See manual

2302M5030

4. OPERATION

4.3.4 Resetting an Alarm

If an alarm condition occurs it is possible to cancel the alarm by pressing any of the buttons, once the gas measurements have returned to a safe level. Otherwise, the instrument will remain in the alarm condition, but the audible alarm will be muted. Any subsequent alarms that occur 1 second after the previous alarm has been reset will reactivate the audible alarm.

4.4 FAULT AND WARNING CONDITION

In addition to the gas alarms, the Impact includes a number of auxiliary alarms to safeguard proper use of the instrument. At switch on the Impact performs an electronic self-test that assures the user of proper performance. When the Impact detects that an electronic fault or failure condition has occurred, the audible and visual alarms are activated and an explanatory message will be displayed.

CAUTION

As the Impact is designed to protect from potentially lifethreatening atmospheric conditions, any alarm conditions must be taken seriously.

4.4.1 Warning

The instrument displays a warning message for situations where a fault or error has occurred but may be resolved by the user.

The 'Code - 0' shown here is an example only. A full list of codes is given in Appendix A.

MAN0597 ISSUE 09 - 12/05

FAULT

Code - 0

Please contact

Zellweger Analytics

Z A Service Number

2302M5030

4. OPERATION

4.4.2 Fault condition

If a fault condition is detected during start-up or subsequently, the instrument will display a fault message warning the user and giving a contact number. This will remain until the instrument is turned off by pressing the button for at least 3 seconds.

The 'Code - 0' shown here is an example only. A full list of codes is given in Appendix A.

4.5 SAFELINK

4.5.1 What is Safelink?

Safelink is a confined space entry communication system between instruments, fitted with the Safelink feature. It allows one instrument (the 'attendant') to display the gas readings measured by the other connected instrument (the 'entrant'), up to a maximum cable length of 100m. Safelink also provides an automatic timed response system requiring the Entrant's instrument to return a signal, activated by the entrant, within a user-specified time interval. Failure of the user to respond will cause an alarm to be raised on the Attendant's instrument. Additionally, any continued pressing on any button on the entrants instrument at any time will cause an 'Emergency' message to appear on the attendant instrument - similar to the action of a panic button. In Safelink mode the entrant instrument can neither be switched off, nor can the pump

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Safelink Mode

Entrant

Attendant

2302M5030

4. OPERATION

feature (where fitted) be used on either instrument. It will be found that while the pump is running the Safelink option on the instrument menu system has been removed. Furthermore, if an attempt to start the pump is made (on either the attendant or entrant instrument) during Safelink operation an alarm condition is generated and Safelink Mode has to be exited.

Safelink mode cannot be entered when the batteries are low (i.e. there is less than 1 bar on the battery indication meter).

In some instances a Fault or Warning will not be displayed on the Entrant instrument. In this case it is important to note that gas alarms on the Entrant instrument are still indicated on the Entrant and the Attendant instruments.

4.5.2 Using Safelink

Connect the Safelink cable between two instruments. Turn on each instrument and from the user menu on each instrument select the Safelink mode.

On one instrument select Attendant. When selecting the Attendant on one instrument the instrument will display ‘locating’ while it attempts to connect with the other instrument. Once

established each instrument will briefly display ‘Configuring’. The instrument will then show the readings – ensure that the Safelink symbols appear on the display. To check the integrity of the communications it is recommended that a message be sent from the Attendant to the Entrant. Whenever a message must be responded, the instrument will flash its green LEDs and sound its audible alarm at a rate of once per second.

Until the Safelink cable is disconnected both instruments will remain in Safelink mode.

MAN0597 ISSUE 09 - 12/05

Tox1

%V/V

ppm

Flam

Tox2

%LEL

ppm

Emergency

00:12:34

Select Message

Evacuate Area

Message 1 Message 2

Are you OK?

2302M5030

4. OPERATION

4.5.2.1 Attendant Instrument

communications are occurring. When it is flashing the Safelink has become disconnected and the readings will all show ‘---‘, until the link is restored or the user exits from Safelink mode. All display modes from the Entrant’s instrument (peak, STEL, etc) are available to the Attendant.

020.9

0 0

The instrument will display the

readings being monitored on the

Entrant instrument. The symbol is

used to indicate the Attendant’s

instrument. When the symbol is static

it indicates that Safelink

The status screen shows the duration

that Safelink has been in operation,

and the status of the connection as

either Normal, Emergency, or Link

failure.

By pressing the

✔ button the

Attendant has access to a menu, to

select a message to send to the

Entrant. These are configurable using

the PC software.

The Select Message menu gives access to two additional actions:

a. Emergency, which immediately issues a ‘Get Out’

warning to the Entrant.

b. Exit, to enable termination of the Safelink without

removing the cable.

MAN0597 ISSUE 09 - 12/05

Select Message

Message 2 Message 3 Message 4

Message 1

Exit Safelink

EXIT

Continue

2302M5030

4. OPERATION

4.5.2.2 Entrant instrument

The symbol is used to indicate the Entrant’s instrument. When the symbol is static it indicates that Safelink communications are occurring. When it is flashing the Safelink has become disconnected.

Only the instantaneous values are shown, although all alarm conditions will operate as normal.

By pressing the

has access to a menu, to select a

message to send to the attendant.

These are configurable using the PC

✔ button the entrant

software, and could be used to

indicate work progress, e.g. ‘Valve

Now Closed’.

4.5.2.3 Timed Response

At a preselected interval the attendant’s instrument will prompt for the Entrant to be checked. The Entrant must press any button within a preselected time, otherwise the Safelink system will assume an emergency situation has occurred and raise alarms on both instruments. The default interval is 5 minutes. The default time to respond to a message is 30 seconds. Both of these can be changed using the PC software.

4.5.2.4 Terminating Safelink

To terminate Safelink mode the cable

should be disconnected between the

instruments. Both instruments will

display a menu enabling Safelink

mode to be switched off.

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4. OPERATION

Safelink mode must be terminated before attempting to use the instrument in a basestation (for charging or calibration) or the Enforcer.

4.6 PUMP (IMPACT PRO ONLY)

The pump allows gas to be drawn through tubing across the sensors. Fitting the Pump Adaptor will automatically switch the pump on.

If the pump is operating correctly the pump symbol will rotate.

Please refer to Section 4.1.2 Other Displayed Symbols of this manual on the operation of the instrument under blocked flow conditions.

The instrument contains a feature that tests and if necessary dynamically sets the Pump Stall threshold via a calibration routine. Upon fitting the Pump Adaptor, the user will see the following sequence of screens. The instrument gives instructions at each stage informing the user as to what operations need to be performed.

Please follow the instructions on screen during the Pump Test and Calibration procedure. Fit the required length of sample tube of the inlet of the Pump Adaptor together with the Hydrophobic Filter. Fit the Pump Adaptor to the front of the instrument.

Pump Test

Please ensure

pump unblocked

Press ✔ to continue

Ensure that there is nothing obstructing the flow into the sample pump and press the

✔ button.

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4. OPERATION

The following screen will be displayed briefly.

Pump Test

Please wait...

Followed by…

Pump Test

Please block pump

Press ✔ to continue

Use a suitable method to block the end of the sample tube and press the

✔ button.

The instrument will now test the pump. Ensure that the blockage is kept in place for the duration of this test.

If the pump test is successful the following screen will be displayed.

Pump Test

Press ✔ to continue

Remove the blockage from the sample tube and press the

✔

button.

The internal sample pump feature is now ready for use.

To stop the sample pump, remove the Pump Adaptor as described in Section 4.6.1 Removal of the Pump Adaptor.

If the Pump Test fails then the pump calibration procedure will start.

Pump Calibration

Please ensure

pump unblocked

Press ✔ to continue

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4. OPERATION

Ensure that there is nothing obstructing the flow into the sample pump and press the

The instrument will then perform the first part of the pump calibration.

✔ button.

Pump Calibration

Please wait...

Pump Calibration

Please block pump

Press ✔ to continue

Use a suitable method to block the end of the sample tube and press the

✔ button. The pump calibration will now commence.

Pump Calibration

Please wait...

Ensure that the pump is kept in a blocked state until the following screen is displayed.

Pump Calibration

Press ✔ to continue

Remove the blockage from the sample tube and press the

✔

button.

The internal sample pump feature is now ready for use.

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4. OPERATION

If the Pump Calibration fails (please see the diagnostic table at the end of this section) then use of the sample pump is inhibited. The Pump Adaptor must be removed from the instrument and the fault investigated. To correctly remove the Pump Adaptor, follow the instructions in section 4.6.1.

Removal of the Pump Adaptor will turn the pump off.

Below 0°C the efficiency of the pump will be adversely affected, requiring a longer sampling time.

The following is a list of possible problems that could cause the instrument to fail the various tests detailed in this procedure.

Symptom Possible Cause Remedy

The instrument reports 'Pump Test Fail'

The sample pump is in an uncalibrated state or the operating conditions of the pump have changed significantly since the last calibration.

The pump was not blocked correctly when required.

A blocked condition was not detected within 30 seconds of the start of the test.

Perform the Pump Calibration to recalibrate the pump.

Remove the Pump Adaptor and refit to restart the test. Ensure that the pump is blocked correctly when instructed to.

Remove the Pump Adaptor and refit to restart the test. Ensure that the pump is blocked as soon as the 'Please block pump screen' is displayed.

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4. OPERATION

Symptom Possible Cause Remedy

The instrument reports 'Pump Calibration Fail'

The pump was not blocked correctly when required.

There is a leakage in the system.

A blocked condition was not detected within 30 seconds of the start of the test.

Remove the Pump Adaptor and refit to restart the test. Ensure that the pump is blocked correctly when instructed to.

Check that the following items are correctly fitted and/ or are not damaged.

• Pump Seal (behind front cover)

• Sample Tube

• Pump Adaptor

Remove the Pump Adaptor and refit to restart the test. Ensure that the pump is blocked as soon as the 'Please block pump screen' is displayed.

PUMP FAULT and WARNING 16 'Pump Fault' screens are displayed following the Pump Calibration.

The Pump Assembly is faulty.

The Pump Calibration has failed.

Request a new Pump Assembly or contact Zellweger Analytics for assistance.

Remove the Pump Adaptor and investigate the fault (see The instrument reports 'Pump Calibration Fail' above).

MAN0597 ISSUE 09 - 12/05

User Menu

Flammable

Calibration

Operator

Instrument

Safelink

Language

2302M5030

4. OPERATION

4.6.1 Removal of the Pump Adaptor

To ease the removal of the Pump Adaptor, follow the steps below.

(1) Support the end of the Pump Adaptor close to the inlet

port using the thumb of one hand.

(2) Press on the top of the clip using the thumb of the other

hand until a click is heard.

(3) Lift the Pump Adaptor clear of the instrument.

4.7 MENUS

While the gas monitoring screen is displayed, pressing the ✔ button will provide access to menus, depending on the model.

Note: Calibration is not permitted until the sensors have

warmed-up and been self tested or if the pump is running. If you access the user menu under any of these circumstances the Calibration option will not be available.

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4. OPERATION

4.7.1 Flammable Gas Selection

It is possible to set the display to read for specific flammable gases. Select the required flammable gas. The instrument will automatically adjust its internal correction factors.

Note that for:

EN50054 100 %LEL Methane = 5.0 %v/v EN61779 100 %LEL Methane = 4.4 %v/v

4.7.1.1 Flammable Cross-Sensitivity Table

Flammable

Gas

(% of Methane Reading)

Hydrogen 125 142

Methane 100 100

Ethylene 91 88

Methanol 83 95

Ethane 90 85

Ethanol 67 71

Propane 68 66

Butane 56 59

Pentane 56 63

Octane 42 47

EN50054

Relative Sensitivity

EN61779

Relative Sensitivity

(% of Methane Reading)

Note: The above data are applicable only to instruments that

are configured to display the Flammable gas in %LEL.

The above table and the cross-sensitivity feature offered in the Impact and Impact Pro are supplied for indicative purposes only. The following points should be noted when using the table or the software feature.

(1) There is variability in sensor cross-sensitivity between

methane and other flammable compounds. Therefore, if

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4. OPERATION

the instrument is calibrated to Methane (including Enforcer calibrations), the reading when other Flammable gases are selected will be subject to variation.

(2) For more accurate detection of non-Methane gases, the

Flammable Channel of the instrument should be calibrated to Propane, Pentane or Butane (selectable from the Settings option in the Calibration Menu). In this instance the reading obtained when Methane is selected may be subject to inaccuracy.

(3) Maximum accuracy will be obtained by calibrating with

the target gas, and is therefore the preferred method.

Target Gas Recommended Calibration Method

Enforcer UI Calibration (using Methane as the selected

Methane

Propane

Butane

Pentane

Other

flammable

gases

calibration gas) PC Calibration (using Methane as the selected

calibration gas) UI Calibration (using Propane as the selected

calibration gas) PC Calibration (using Propane as the selected

calibration gas) UI Calibration (using Butane as the selected

calibration gas) PC Calibration (using Butane as the selected

calibration gas) UI Calibration (using Pentane as the selected

calibration gas) UI Calibration (using Propane, Butane or Pentane as

the selected calibration gas) PC Calibration (using Propane or Butane as the

selected calibration gas)

4.7.2 Operator

This allows a new operator and/or location to be selected without restarting the instrument.

MAN0597 ISSUE 09 - 12/05

Software Revision

Version 2.6

Serial Number

0000000000

Calibration Due

in 34 days

02 %V/V Flam %LEL

120

23.0

19.0

17.0

Flammable Gas

Methane

A1 A2 A3

50 100 150 100

25 50

100

50 25

A1 A2 A3

STEL

LTEL

CO ppm

H2S

ppm

Pump

Fitted

Data Logging

Event

Safelink

Fitted

Last Calibration

1 Jan 2001

Autozero

Enabled

Gas Alarms

Latched

Battery

Rechargeable

Vibrating Alarm

Enabled

Language

English

2302M5030

4. OPERATION

4.7.3 Calibration

See Section 4.9 Calibration for full details.

4.7.4 Instrument Details

Several screens are available detailing the instrument set-up, such as alarm levels. These can be viewed by pressing the and ▼ buttons to cycle through them. Some examples are shown below and these are indicative only. Information shown will vary according to model, country, product application and / or specific requirements.

▲

This information is also available at switch-on of the instrument (see section 3.1 for details).

These are the alarm level settings for oxygen and flammable sensors. There are no associated STEL or LTEL alarms for these sensors. ↑ indicates a rising alarm and ↓ indicates a falling alarm.

This shows the alarm levels for the toxic sensors.

The following displays indicate whether particular options are fitted and how the instrument is currently configured.

MAN0597 ISSUE 09 - 12/05

Cartridge SN

0001138

Date of Manufacture

25/Jun/2001

Boot ROM Version

Impact Boot 1.4+

Cartridge Type

Standard

Install By

26/Dec/2001

Date of Activation

9/Aug/2001

2302M5030

4. OPERATION

The following additional information is also displayed:

4.7.5 Safelink

For Impact Pro instruments the additional menu for Safelink is available. It is used to initiate communication via Safelink to another Impact Pro instrument.

The Safelink option (where applicable) will not be available in the following situations.

• When the internal sample pump is running.

• When the batteries are low (i.e. there is less than 1 bar on

the battery indication meter).

4.7.6 Language

The Impact is supplied pre-loaded with English, French, German, Italian, Spanish and Dutch languages, which can be selected using the

▲, ▼ and ✔ keys of the instrument. In

addition one other alternative language can be uploaded to the Impact (currently available are Portuguese, Danish, Swedish, Norwegian and Finnish) using the Impact Configuration Utility (ICU) PC software, which is supplied separately.

4.8 DATALOGGING

There are two types of datalogging. In both cases the information is accessed by downloading it to a computer using the PC software, which is supplied as part of the Datalogging Kit. The PC software enables this data to be downloaded,

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4. OPERATION

stored, printed and analysed. The data can be exported in a format suitable for use with major spreadsheet software packages. The datalog memory can be automatically cleared after a successful download – note that this will not change any of the alarm levels, instrument settings, or calibration gas settings or values of the instrument. An internal battery will retain the data for 5 years even if the instrument battery is disconnected or the instrument is switched off. Refer to Section 4.8.1 on how to install the PC software.

4.8.1 Installing the PC Software

(1) Insert the CD into your CD-ROM drive. If the CD

autoruns press the Esc key to stop.

(2) From the Start menu, choose Run.

(3) In the Run dialog box, type d:\English\ setup.exe, where

d is the letter assigned to your CD-ROM drive.

(4) Click OK, then follow the instructions on your screen.

4.8.2 Event Datalogging

All instruments are supplied complete with event datalogging. This records the time and date whenever an event occurs. When the datalogging memory is full then the earliest data is overwritten. In event mode the datalogging memory can store at least 500 events. An event can be:

• Instrument switch on

• Instrument switch off

• Peak gas reading whilst switched on

• Any gas alarm (A3, A2, A1, STEL, LTEL)

• Low battery

• Fault

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4. OPERATION

4.8.3 Gas Datalogging (optional)

Set-up by the PC software for instruments fitted with this full datalogging option it enables the instrument to monitor areas for gas, sampling either at a regular interval (for instance, every 15 seconds) or when the readings change by a userselected difference.

This extended datalogging can also store the event logging information if required.

4.8.4 Output Formats

The calibration history, event logging and gas logging are output in a CSV (Comma Separated Variable format) with the file extension '.txt'. To view the information in Microsoft Excel®, follow these steps:

(1) Open the file using Microsoft® Excel. Note that the 'Files

of Type' box must be set to 'All files' to show the files, which have a '.txt' extension.

(2) Excel will recognise the format as 'delimited text' and

start up a 3 step 'Text Import Wizard'.

(3) For step 1 select 'Delimited'. Then press 'Next'.

(4) For step 2, in the Delimiters box, ensure Tab and

Commas are enabled. Then press 'Next'.

(5) For step 3, ensure Column Data Format is 'General'.

Then press 'Finish'.

(6) The data will now be shown in consecutive columns,

and can be saved, printed and analysed as required.

To create a file, which can be opened directly from Windows Explorer simply by double-clicking on it, change the file extension to '.csv' before downloading and saving the file.

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4. OPERATION

4.9 CALIBRATION

The accuracy of the Impact instrument must be functionally checked with known concentration calibration gas before each day’s use. If any sensor fails recalibrate the Impact before using, or replace the cartridge. It is recommended that the instrument be calibrated at least every 6 months. The calibration interval for the CO

The Impact instrument provides three methods of calibration, offering flexibility for the user. Flow calibration is the traditional method and can be performed, following instructions displayed on the instrument itself (Section 4.9.2 Flow Calibration – Instrument), or when the instrument is connected to a PC via a basestation, on the PC display (See Section 4.9.3 Flow Calibration – PC). An alternative method for instruments fitted with a combination of oxygen, flammable, carbon monoxide and hydrogen sulfide sensors only is to use the Enforcer accessory. For all other gases the flow calibration method must be used.

sensor shall not exceed 1 month.

CAUTIONS

Use of non-standard calibration gas and/or calibration components when calibrating the Impact can lead to dangerously inaccurate readings.

The calibration should be carried out in a well-ventilated area to avoid contaminants.

Do not calibrate the CO clean air after the apparatus has been exposed to CO concentrations above the upper limit of the measuring range. In this case leave the instrument in clean air overnight before calibration.

4.9.1 Contaminants

Oxygen sensors may be affected by prolonged exposure to carbon dioxide, and it is recommended the Impact not be subjected to use in atmospheres containing more than

channel if CO2 is indicated in

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4. OPERATION

25%v/v carbon dioxide (CO2). Oxygen sensors may read high in the presence of carbon dioxide.

Flammable sensors may be affected by exposure to Silicone substances; organic phosphorus containing compounds and halogenated organic compounds. Although the flammable sensors used in Impact and Impact Pro have a high resistance to Hydrogen Sulfide (H should be expected. Therefore it is strongly recommended repeated gassing with H should be followed by checking and if necessary re-calibration of the Flammable sensor. The sensors on average will lose approximately 20% of their sensitivity when subjected to forty applications of H2S for a period of 1 minute each.

S) poisoning some loss in sensitivity

S or gas alarms on the H2S channel

The toxic sensors are designed to be gas specific, minimising the effects of common cross-interfering gases. The table below summarises the effect of various gases on the Carbon Monoxide and Hydrogen Sulfide sensors.

Applied Gas H

Acetone (1000ppm) 0 0

Acetylene (40ppm) 0 80 Ammonia (50ppm) 0 0

Carbon Monoxide (50ppm) 0 50

Carbon Dioxide (5000ppm) 0 0

Chlorine (0.5ppm) 0 0

Ethanol (2000ppm) 0 3

Ethylene (100ppm) 0 85

Hydrogen (100ppm) 0 20

Hydrogen Sulfide (10ppm) 10 0

S Response

(ppm)

CO Response

(ppm)

Iso-Propanol (200ppm) 0 0

Nitric Oxide (25ppm) 0 4

Nitrogen Dioxide (3ppm) 0 0.5

Sulfur Dioxide (2ppm) 0 0

MAN0597 ISSUE 09 - 12/05

Password:

XX . .

Calibration

Span

Settings

Zero

2302M5030

4. OPERATION

4.9.2 Flow Calibration – Instrument

The following equipment is required:

• cylinder of calibration gas (either certified individual gas per

sensor or a certified multi-gas mixture)

• flow adaptor: ensure that the tubing is fitted to the port

marked 'IN' (except for Cl should be fitted to the port marked 'OUT').

• flowmeter/regulator set to 300ml/min

• tubing

cartridges where the tubing

To put the instrument into calibration mode the menus are accessed. If configured it may be necessary to enter a password before access to calibration is possible.

The keys must be pressed in the correct sequence, otherwise the password will be rejected. As each key is entered the ‘.’ will be replaced by ‘X’.

The calibration procedure requires a zero, followed by a span. The span requires specific concentration of calibration gas that matches those held in the settings. Select the required option.

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Zero

Flam

H2S

All

Press when

in fresh air?

✓

2302M5030

4. OPERATION

When performing a flammable span gas concentration the instrument will assume the use of the gas selected. However, after calibration it will revert to the flammable gas that the instrument is set to measure. No intervention by the user is required.

Note: For Methane or Propane calibrations the following

conversion should be used.

EN50054 100%lel Methane = 5.0%v/v EN50054 100%lel Propane = 2.0%v/v EN61779 100%lel Methane = 4.4%v/v EN61779 100%lel Propane = 1.7%v/v

If other values are required, adjustment of the calibration point should be carried out as detailed in Section 4.9.2.2 Span of this manual.

4.9.2.1 Zero

If calibrating the CO section 4.9.

channel, refer to the CAUTIONS in

The display will show the sensors fitted in the cartridge, and offer the option to ‘hard’ zero an individual channel or all four simultaneously. O

is automatically highlighted.

Assuming flammable is selected by pressing the

▼ and ✔ keys, the

display will show:

The zero must be performed in fresh, uncontaminated air. Alternatively, a supply of compressed air with an oxygen content of 20.9%v/v can be used.

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Zero

Please wait . . .

Zero

Press to continue✓

Zero

Fail

Press to continue✓

Span

Flam

H2S

All

Apply gas at

0.3L per min

✓ - OK, - Abort

2302M5030

4. OPERATION

After pressing the ✔ button the instrument will display the following whilst zeroing the sensor.

Once the zero is complete the instrument will display whether the zero was successful.

If the zero was unsuccessful repeat the zero ensuring that the instrument is in fresh air. If a second failure occurs the cartridge should be changed. After a successful zero a span should be performed.

4.9.2.2 Span

The display will show the sensors fitted in the cartridge, and offer the option to span an individual channel or three simultaneously using a gas mix.

Having selected the gas the display

will change to show:

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Span

Please wait . . .

Span

Press to continue✓

Span

Fail

Press to continue✓

2302M5030

4. OPERATION

Ensure that the Span Calibration Setting matches that of the gas concentration being applied. If not, press the button to change the setting.

The following table gives the current set allowable range of Span Gas Concentrations.

Gas Type Allowable Range

Methane 20%LEL to 100%LEL

Carbon Monoxide 80ppm to 500ppm

Hydrogen Sulfide 15ppm to 50ppm

Carbon Dioxide 0.5 %V/V to 2.1 %V/V

Chlorine 2ppm to 10ppm

Ammonia 10ppm to 100ppm

Sulfur Dioxide 5ppm to 20ppm

Ensure that the correct concentration of the gas is available. If not then press the button to change the settings.

If calibrating the CO before pressing the

channel, turn on the gas 2 minutes

✔ button.

After pressing the

✔ button the

instrument will display this message whilst spanning the sensor.

Once the span is complete the instrument will display whether the span was successful.

If the span was unsuccessful repeat the span ensuring that the calibration gas used is of the correct concentration, there is sufficient gas in the cylinder and that the flow rate is correct.

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Settings

Flam:

CO:

H2S:

150 50

%LEL

ppm ppm

Select Gas

Propane

Butane

Methane

Pentane

2302M5030

4. OPERATION

4.9.2.3 Calibration Gas Settings

WARNING

Verify that the concentration printed on the label of the calibration gas cylinder that will be used is the same as the concentration shown on the calibration gas settings screen. Using the wrong concentration may cause incorrect adjustment during calibration procedures, and lead to dangerously inaccurate readings during normal operation.

Select the channel to change. The highlighted channel settings can then be altered using the

▲ (increase) and

▼ (decrease) buttons, holding the

buttons down to change the setting more rapidly. Press

✔ to store the

new settings value.

Assuming flammable is chosen the instrument will request which calibration gas is being used, irrespective of what the instrument is set to measure.

Zellweger Analytics recommends the following calibration gas concentrations:

Flammable (%LEL Measurement) :50%lel Methane Flammable (%VOL Measurement):2.5%v/v Methane Carbon Monoxide: 100ppm Hydrogen Sulfide: 40ppm Carbon Dioxide: 2.0 %v/v

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4. OPERATION

Cartridges manufactured before 1/2/2002 have the following calibration gas limits:

Minimum Maximum

Flammable (%lel): 25% 100% CO: 100ppm 500ppm H

S: 15ppm 50ppm

: 0.5% v/v 3.0% v/v

Cartridges manufactured after 1/2/2002 have the following calibration gas limits:

Minimum Maximum

Flammable (%lel): 25% 100% Flammable (%vol): 1.2% 5.0% CO: 80ppm 500ppm H

S: 15ppm 50ppm

: 0.5% v/v 3.0% v/v

Performing a manual calibration using settings lower than these specified minima will result in a calibration failure.

4.9.3 Flow Calibration – PC

For this function the user will require the Impact Configuration Utility (ICU) PC software, serial cable, Base Station and Power supply. These items can be purchased as part of the DataLogging kit (available separately).

Place the Impact into the basestation and ensure that there is power connected. Switch the Impact on, and then follow the instructions on the computer.

The instrument will display the readings whilst the calibration process is occurring and the symbol will be displayed in the centre of the display.

The software is designed to be easy to use and has its own manual and online help.

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Press to continue✓

Enforcer Calibration

2302M5030

4. OPERATION

Information, such as gas cylinder serial numbers, can also be entered for traceability. Also, calibration reports can be printed.

4.9.4 Enforcer Calibration

This is designed for oxygen, flammable, carbon monoxide and hydrogen sulfide, using a special-totype gas cylinder. It offers quick, simple and safe operation by any user, due to the use of a patented low pressure, low flow rate system.

Note that the Enforcer cylinder contains dangerous gases.

The instrument is switched on and the autozero procedure performed. If the instrument was 'hard zeroed' (using the zero on the calibration menu) prior to a successful Enforcer calibration the unit will automatically update the next calibration required by 180 days. If the unit was only 'soft zeroed' (autozero during switch on) prior to a successful Enforcer calibration the unit will not adjust the next calibration date. If the Enforcer calibration fails then no adjustments are made whether a hard or soft zero was performed.

The instrument, when placed correctly into the Enforcer, will recognise it and will prompt the user to press the

✔ button

The instrument will then control the calibration process. The user should hear the distinctive ‘click’ of the Enforcer gas

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Press to continue✓

Enforcer Calibration

Fail

Press to continue✓

Enforcer Calibration

2302M5030

4. OPERATION

delivery solenoid valve. After completion, the instrument will display whether calibration was successful.

Remove the instrument from the Enforcer. If the Enforcer calibration failed repeat the process. If it fails again return the instrument for a calibration under controlled conditions or replace the cartridge.

The instrument automatically reverts to a flammable gas setting of methane whilst in use with the Enforcer. On completion it will revert to the flammable gas that the instrument is set to measure. No intervention by the user is required.

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5. FAULT FINDING AND PROCEDURES

There are two levels of fault within the instrument.

The first level is a warning, from which the user may be able to recover, e.g. a low battery. The user must press the to confirm the warning has been seen.

The second level is usually non-recoverable by the user, and in some cases the only action available is to switch the instrument off.

In both cases a warning/fault code number is given with a brief description of the fault, and a contact name/telephone number to enable the user to further assistance if required. Details of the warning and fault codes are given in Appendix A.

✔ button

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6. ACCESSORIES

WARNING

DO NOT ATTEMPT TO CHARGE THE BATTERY PACK IN THE HAZARDOUS AREA.

The following accessories are available for use with Impact/ Impact Pro.

6.1 BASESTATION

(Part Number: P2302B0800)

This unit provides a smart charging facility for instruments powered by rechargeable NiMH batteries. The instrument is simply inserted into the base station whereby it is fast charged. The instrument controls the charging process and will indicate when it is fully charged, and then change to a trickle charge mode to keep the battery topped up until the instrument is required.

The basestation also provides a facility to connect the instrument to a PC, for downloading of logged data, viewing or changing instrument configuration information, or as a means of instrument calibration.

Ensure that the instrument is not inserted backwards into the basestation. Firstly locate the lip at the front of the instrument into the corresponding recess, and then latch the rear catch. To release pull back the rear catch (see Section 2.3 Charge for first use).

If the instrument is switched on whilst placed in the basestation the instrument will not reach full capacity (typically only 85% if switched on for the entire fast charge period).

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6. ACCESSORIES

The basestation accepts an input of 12Vdc to 32Vdc.

Basestations may be daisy-chain linked. See Section 6.3 Basestation PSU Link Cable.

6.2 BASESTATION PLINTH

(Part Number: P2302B0804)

The basestation can also be mounted desk-mounted or vertically, singly or stacked using the optional plinth. To mount the basestation vertically remove the base plate and rotate. To mount in a vehicle remove the base plate to reveal two mounting holes, for screwing the basestation to the vehicle bodywork or suitable framing.

6.3 BASESTATION PSU LINK CABLE

(Part Number: 2302D0821)

Allows basestations to be linked together, to a maximum of 5, minimising cabling and power sockets, and forming a multibank charger.

Due to the potential variety of applications and installations Zellweger Analytics do not supply such power supplies. The requirements are 12Vdc to 32Vdc, rated at 500mA per basestation.

WARNING

The standard Power Supply unit must not be used when connecting multiple Base Stations. Overheating of the Power Supply and ultimately failure will result.

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6. ACCESSORIES

6.4 OFFLINE TRICKLE CHARGER

Permits off-instrument charging of 2 or 4 instrument battery packs in 14 hours. It enables 24 hour availability of rechargeable instruments with purchase of additional battery packs.

Battery packs must be charged in pairs. The trickle charger is supplied with the required mains PSU.

The red LED indicates the batteries are receiving charge. Please note that the battery packs must be charged in pairs, and may be left inserted indefinitely until required.

Power Supply Part Number

230Vac 50Hz Euro plug format 2302B0730 230Vac 50Hz UK plug format 2302B0731 120Vac 60Hz USA plug format 2302B0732 240Vac 50Hz Australian plug format 2302B0733

6.5 POWER SUPPLY FOR BASESTATION AND TRICKLE CHARGER

A range of suitable power adaptors is available to power the base station and trickle charger:

Power Supply Part Number

1 230Vac 50Hz Euro plug format 2302D0816 2 230Vac 50Hz UK plug format 2302D0818 3 120Vac 60Hz USA plug format 2302D0819 4 240Vac 50Hz Australian plug format 2302D0820 5 12V/24VDC vehicle charger lead 2302D0815

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1 2 3 4 5

2302M5030

6. ACCESSORIES

CAUTION

These individual Power Supplies will only supply power to one Basestation or one Trickle Charger.

6.6 ENFORCER

(Part Number: 2302B0831)

This test and calibration accessory is only for use with instruments fitted with any combination of oxygen, flammable, carbon monoxide and hydrogen sulfide sensors. Its operation is described in Section 4.9.4 Enforcer Calibration. This is supplied complete with an Enforcer disposable, multigas cylinder.

For EMC/RFI Enforcer is tested to EN50270 Light Industrial Type 2.

6.7 ENFORCER GAS CYLINDER

(Part Number: 2302D0833)

The Enforcer requires a gas cylinder with pre-set concentration values, and a specific valve to maintain the required low pressure and flow rate, which enables the Enforcer to operate quickly and simply.

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6. ACCESSORIES

6.8 FLOW ADAPTOR

(Part Number: P2302B0810)

Allows aspirator to be fitted to the instrument. It is also used when calibrating using the instrument or the PC. It is coloured grey to differentiate it from the pump adaptor. See Section

6.12 Pump Adaptor Kit.

6.9 METAL BELT CLIP

(Part Number: P2302D0826)

Supplied as standard. Enables the instrument to be worn on a belt.

6.10 INSTRUMENT WEBBING CLIP

(Part Number: P2302B0382)

Allows the instrument to be clipped to harness webbing.

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6. ACCESSORIES

6.11 BODY HARNESS KIT

(Part Number: P2302B0822)

Simply clips onto the rear of the instrument. Allows the instrument to be worn on the chest within the breathing zone. Comes with a waist strap and neck strap.

6.12 PUMP ADAPTOR KIT

(Part Number: 2302B0814)

When plugged into the pump aperture (2)

of an instrument fitted with the

pump, the pump will be automatically activated by the instrument. Subsequent removal of the adaptor will switch the pump off. This maximises the battery life of the instrument, as well as prolonging the life of the pump in the instrument. It is coloured black to differentiate it from the flow adaptor. See Section 6.8 Flow adaptor.

6.13 10M SAMPLE TUBE KIT

(Part Number: 2302B0828)

Extends the sampling reach of the instrument, and can be used hand aspirator or Pump Adaptor Kit. Supplied with a coupler it can be extended beyond 10m (30') by purchasing additional kits. The maximum recommended length is 20m and the sample time should be adjusted accordingly.

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6. ACCESSORIES

6.14 EARPIECE

(Part Number: 2302B0841)

For noisy environments the earpiece plugs into the audible aperture (4), to allow any audible alarms or signals to be heard. The vibrating alarm if fitted will still operate. The instrument audible alarm produces a high sound level. Caution should be exercised when using the earpiece.

6.15 BASESTATION PC LINK CABLE

(Part Number: P2302D0807)

This is supplied to connect the basestation to a standard 9-pin D-type RS232 serial port on a PC or laptop, running the PC software.

6.16 SAFELINK CABLE ASSEMBLY

This is available in 4 different lengths and allows Safelink enabled instruments to be connected together for communications, as described in Section 4.5 Safelink.

10m (33') + 2 x Cable Restraints 2302B0735

30m (100') + 2 x Cable Restraints 2302B0736

50m (150') + 2 x Cable Restraints 2302B0737

100m (300') + 2 x Cable Restraints 2302B0746

2302B0746 is supplied with a cable reel and an adaptor.

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6. ACCESSORIES

6.17 SAFELINK CABLE RESTRAINT CLIP

(Part Number: P2302B0713)

Clips the Safelink cable to a belt to provide a strain relief.

6.18 HAND ASPIRATOR KIT

(Part Number: 2302B0813)

Clips onto the flow hood to provide manual aspiration.

The bulb should be squeezed at a rate of one per second, until a stable reading is obtained. As a guideline, the following sample tube lengths will require:

Length m

(approx ft)

1 (3) 15

5 (15) 20 10 (30) 25 15 (50) 30

30 (100) 40

Sampling Time

(seconds)

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6. ACCESSORIES

6.19 SENSING PROBE 1M

(Part Number: 2302B0847)

Used with the bulb operated hand aspirator or the internal pump if fitted, it allows sampling from above normal height areas or into areas of low accessibility. Ensure that the sections of the sampling probe are tightened to prevent dilution of the sample.

6.20 BALL FLOAT

(Part Number: 2302B0846)

Clips to the end of the sampling tube being used, and provides the dual function of preventing liquid entering the instrument and also breaking the surface tension of any liquid to release trapped gas.

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7. ROUTINE MAINTENANCE

The Impact/Impact Pro is designed to operate almost maintenance free under most conditions, except for the need for regular calibration. However, it is recommended that on a regular basis the instrument is cleaned and the filters changed.

7.1 CLEANING

The instrument may need cleaning if exposed to dirty or hostile conditions. This can be easily achieved by wiping over with a damp cloth. Do not use bleaching products or products containing silicon compounds as these can cause damage to the sensors.

7.2 FILTERS

The Goretex filter fitted under the grille cover is manufactured from a water repelling material to protect the sensors from the ingress of water and other contaminants. The life of this filter is dependent on the amount of dust and viscous liquids in the atmosphere. If it becomes dirty (discoloured) it will act as a barrier and prevent the diffusion of the atmosphere onto the sensors, and must be replaced. This is easily achieved by removing the grille cover screws (Section 1.2 Product overview (5)), using the moulded detail to locate it.

discarding the old filter and fitting a new filter,

Note that for instruments fitted with a chlorine sensor a stainless steel filter (part number P2302D0823) must be used instead of the Goretex filter.

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7. ROUTINE MAINTENANCE

7.3 BATTERY CHARGING / REPLACEMENT

WARNING

Battery Charging and replacement must not be carried out in a hazardous or potentially dangerous area.

A mixture of dry cell and rechargeable battery packs must not be used - the instrument safety system prevents operation in such a situation, and the instrument displays a fault message and activates the audible and visual alarms.

If the instrument is fitted with a CO to the instructions in Section 8 – Charging Procedure for

Impact Pro fitted with CO

Variant Cartridges.

Cartridge, please refer

INFORMATION

To maintain peak battery performance Zellweger Analytics strongly recommend that the batteries be periodically (every 4 to 6 months) fully discharged before recharging. To do this, remove the Impact from the Base Station (if fitted) and switch the Impact on. Leave the Impact to run until it switches off. This may take up to 12 hours depending on the state of charge of the batteries. A Warning 14 (Battery Low) will be generated towards the end of this procedure, which can be acknowledged or ignored. Once the Impact has switched off, fit it into the Base Station and allow the instrument to fully recharge before next use.

In severe cases (e.g. when the instrument has not been used for some time) it may be necessary to repeat this 2 or three times to restore peak battery performance.

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7. ROUTINE MAINTENANCE

INFORMATION

Should the batteries in the Impact instrument become excessively discharged (e.g. when unused for some time) there may be occasions when the alarm LEDs and sounder will operate when attempting to switch the instrument on before recharging. In this instance please place the instrument into the powered Base Station and switch the instrument off when Fault 23 is displayed. The Impact will then proceed to charge as normal.

7.3.1 Rechargeable Battery Pack

CAUTION

The rechargeable battery packs are sealed units. Do not attempt to remove the cells from the packs as this will invalidate the safety certification.

Battery packs can be recycled by returning to the nearest Zellweger Analytics Appointed Distributor.

Remove the battery packs if the instrument will not be used for some time.

The basestation accessory is used to charge rechargeable battery packs, provided it is powered from an appropriate power supply source. The instrument is simply placed in the basestation, which charges the packs under the control of the instrument.

When first placed in the basestation all four red LEDs will briefly light, to indicate charging will occur.

Whilst charging, two of the red LEDs will flash at a slow rate. Once fully charged the red LEDs will be switched off and the green LEDs will be constantly lit.

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7. ROUTINE MAINTENANCE

If the instrument is switched on when it is placed in the basestation the charging progress will be displayed on the instrument.

If a dry-cell instrument is inadvertently placed in the basestation no damage will occur due to a built-in safety system.

In the event that the rechargeable battery packs needs to be replaced or the dry-cell adaptors are to be used to power the instrument, the battery cover screws (see Section 1.2 Product

overview) Product overview) and the sealed units removed.

Replacement rechargeable packs are inserted into the compartments and the covers replaced.

are released using the built-in tool (see Section 1.2

The full fast charge time for a pair of fully discharged battery packs is 7 hours indicated by two of the red alarm LEDs flashing approximately every 2 seconds. After this period the instrument will trickle charge the battery packs indefinitely shown by the green LEDs being constantly illuminated.

7.3.2 Dry cell

If dry cells are to be used the specific adaptors must be used to comply with certification. Ensure the orientation of the individual cells is correct, and that they are all of the following types:

Duracell MN1500

Energizer Intelligent E91.

WARNING

Use of any other dry-cell battery will render the intrinsic safety approval of the instrument void.

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8. ROUTINE SERVICING

Apart from the maintenance described in Section 7. ROUTINE MAINTENANCE the servicing requirements are limited to:

• Calibration

• Changing of the cartridge when required or indicated by the

instrument

• Replacing sensors in serviceable cartridges (i.e. non-

OFCH combinations where supported by the instrument)

8.1 SERVICEABLE CARTRIDGES

Instruments that support serviceable cartridges can have the individual sensors replaced, instead of replacing the whole cartridge.

The procedure is as follows:

(1) Switch the instrument off and remove the front cover.

(2) Unscrew the central cartridge screw and remove the

cartridge.

(3) On the underneath undo the two screws (1).

(4) Lever out the PCB from the locating tabs (2), on the two

sides adjacent to the screws. Retain the sensor retainer (3) if fitted.

(5) Pull out the PCB.

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8. ROUTINE SERVICING

(6) For all sensors except the oxygen, replacing the sensor

requires the user to unplug the existing sensor and locate the new sensor in the same position.

Please note that CO2 sensors are supplied on a PCB, which must be removed before fitting the sensor to the cartridge.

(7) For the oxygen sensor the two screws (4) must be

undone. The tabs of the replacement sensor must be securely screwed to headers. Ensure each sensor tab is secured to the correct header.

(8) Replace the PCB in the housing, until it clicks into place.

(9) Replace the two screws (1), ensuring the retainer is

fitted (3) and insert the cartridge into the instrument.

(10) Check the front cover membrane and if necessary

replace it.

(11) Replace the front cover and wait at least 20 minutes.

Then switch the instrument on.

(12) The instrument must be calibrated before use.

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8. ROUTINE SERVICING

Special Notes for Cl2 Cartridges

It is important that you read all of the notes below before installation or use of your new cartridge.

Installation of your Cl

Cartridge

Note: Cartridge Installation or Replacement must never be

carried out in a hazardous area.

(1) If a cartridge was previously fitted to the Impact into

which the Cl

cartridge is to be installed, remove the

Front Cover Grille using the Allen Key provided in the bottom of the Impact. Unscrew the fixing in the centre of the cartridge and lift the cartridge from the Impact.

(2) Place the Cl2 cartridge into the Impact and screw the

cartridge fully home using the Allen Key. Guide the cartridge if necessary using your fingers to ensure that it is seated correctly.

(3) Replace the Pump Seal with the one provided with your

cartridge.

(4) Remove the existing Filter Assembly from the inside of

the Front Cover Grille by peeling it away. Take the Stainless Steel Filter assembly (supplied in the Cartridge Kit) and remove the protective backing paper. Locate the Filter assembly onto the locating pegs on the inside of the Front Cover Grille and lightly press around the edge of the gasket to secure.

(5) Replace the Front Cover Grille and refit the Allen Key

into the bottom of the Impact.

(6) To complete installation of the cartridge allow at least

20 minutes before operating the Impact.

(7) After this period of time switch the Impact on and accept

the New Configuration when prompted to do so.

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8. ROUTINE SERVICING

Using your Cl2 Cartridge

Please ensure that the following points are noted when the cartridge is in service.

(1) Always use PTFE tubing (maximum length of 500mm)

and a flow rate of 500ml/min when calibrating the Cl channel.

(2) Apply all gases to the port marked OUTLET (not INLET)

on the Flow Housing.

(3) With regard to the actual sensors fitted, please perform

span calibrations on the sensors of the Impact cartridge in the following order: Cl

, NH3, H2S, CO, Flammable.

(4) When performing a Span Calibration on the Cl

it is good practice to flow Cl

calibration span gas

channel

through connected tubing for a minimum of 15 minutes without the flow adapter fitted to the Impact before attempting a span calibration. Failure to do so may result in a false calibration of the Cl

channel.

(5) Do not apply Span Calibration gas to the Impact for

greater than 5 minutes. Again failure to do so may result in a false calibration of the Cl

channel.

(6) This cartridge is not suitable for pumped mode

operation.

(7) Due to the open nature of the Stainless Steel filter, there

is a greater risk of water damage occurring to the instrument. Every attempt should be made to keep the instrument dry.

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8. ROUTINE SERVICING

(8) Refer to the CAUTIONS given in section 1.1 of this

manual for details on recommended daily checks on your gas detector.

Applied Gas Effect on CO

Sensor

CO (100ppm) 100ppm 0ppm 0%v/v 0ppm 35ppm 1ppm

S (40ppm) 0ppm 40ppm 0%v/v -25ppm1 50ppm 1ppm

CO2 (0.5%v/v) 0ppm 0ppm 0.5%v/v 0ppm 0ppm TBA

Cl2 (5ppm) 0ppm 0ppm 0%v/v 5ppm 0ppm -2ppm1

NH3 (50ppm) 0ppm 0ppm 0%v/v -2ppm1 50ppm TBA

Hydrogen

(1000ppm)

SO2 (10ppm) 0ppm 0ppm 0%v/v 2ppm 0ppm 10ppm

Reading displayed as -0ppm.

200ppm 0ppm 0%v/v TBA 35ppm TBA

Effect on

H2S Sensor

Effect on

CO2 Sensor

Effect on Cl

Sensor

Effect on NH3

Sensor

Effect on SO2

Sensor

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8. ROUTINE SERVICING

Special Notes for NH3 Cartridges

It is important that you read all of the notes below before installation or use of your new cartridge.

Installation of your NH

Cartridge

To install the cartridge, follow the instructions below.

Note: Cartridge Installation or Replacement must never be

carried out in a hazardous area.

(1) If a cartridge was previously fitted to the Impact into

which the NH

cartridge is to be installed, remove the

Front Cover Grill using the Allen Key provided in the bottom of the Impact. Unscrew the screw in the centre of the cartridge and lift the cartridge from the Impact.

(2) Place the NH3 cartridge into the Impact and screw the

cartridge fully home using the Allen Key. Guide the cartridge if necessary using your fingers to ensure that it is seated correctly.

(3) Replace the Pump Seal with the one provided with your

cartridge and replace the Front Cover. Refit the Allen Key into the bottom of the Impact.

(4) Allow 20 minutes for the sensors to stabilise before first

use.

(5) To complete installation of the cartridge, switch the

Impact on and accept the New Configuration when prompted to do so.

Using your NH

Cartridge

Please ensure that the following points are noted when the cartridge is in service.

(1) The Ammonia channel has an extended warm-up time.

Although the other channels of the cartridge will be

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8. ROUTINE SERVICING

reading correctly, the detector should not be used to measure Ammonia until the 'warm up' message has disappeared.

(2) The operating temperature range of the cartridge

defaults to that of the lowest sensor fitted. For NH is -20°C to +40°C.

(3) Always use PTFE tubing (maximum length of 500mm)

when calibrating the NH

channel.

this

(4) When performing a Span Calibration on the NH

channel it is good practice to flow NH3 calibration span gas through connected tubing for a minimum of 15 minutes without the flow adapter fitted to the Impact before attempting a span calibration. Failure to do so may result in a false calibration of the NH channel.

(5) The accuracy of the instrument must be functionally

checked with known concentration calibration gas before each day's use. If any sensor fails, recalibrate the Impact before using or alternatively replace the cartridge. Please refer to the Impact User Manual on general instructions on how to calibrate.

(6) Apply calibration span gas at a rate of 300ml/min for a

period of 5 minutes before starting the span calibration on the sensor.

(7) With regard to the actual sensors fitted, please perform

span calibrations on the sensors of the Impact cartridge in the following order: Cl

, NH3, H2S, CO, Flammable.

(8) Purge the system with air for a period of 15 minutes

between Cl

and NH3 calibrations to avoid interaction

between these two gases.

(9) The sensors fitted to Impact may give responses to

gases other then the target gas. The table below gives typical sensor responses to various gases and should

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8. ROUTINE SERVICING

be used as a guide only. Note: Always use the target gas to perform sensor calibrations.

(10) Your attention is drawn to the cross-sensitivity of the

NH3 sensor in the presence of H2S. This is normal operation and is due to the chemistry of the NH

sensor.

Applied Gas Effect on CO

Sensor

CO (100ppm) 100ppm 0ppm 0%v/v 0ppm 35ppm 1ppm

S (40ppm) 0ppm 40ppm 0%v/v -25ppm1 50ppm 1ppm

CO2 (0.5%v/v) 0ppm 0ppm 0.5%v/v 0ppm 0ppm TBA

Cl2 (5ppm) 0ppm 0ppm 0%v/v 5ppm 0ppm -2ppm1

NH3 (50ppm) 0ppm 0ppm 0%v/v -2ppm1 50ppm TBA

Hydrogen

(1000ppm)

SO2 (10ppm) 0ppm 0ppm 0%v/v 2ppm 0ppm 10ppm

Reading displayed as -0ppm.

200ppm 0ppm 0%v/v TBA 35ppm TBA

Effect on

H2S Sensor

Effect on

CO2 Sensor

Effect on Cl

Sensor

NH3Sensor

Effect on

SO2Sensor

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8. ROUTINE SERVICING

Special Notes for SO2 Cartridges

It is important that you read all of the notes below before installation or use of your new cartridge.

Installation of your SO

Cartridge

Note: Cartridge Installation or Replacement must never be

carried out in a hazardous area.

(1) If a cartridge was previously fitted to the Impact Pro into

which the SO

cartridge is to be installed, remove the

Front Cover Grill using the Allen Key provided in the bottom of the Impact Pro. Unscrew the screw in the centre of the cartridge and lift the cartridge from the Impact Pro.

(2) Place the SO

cartridge into the Impact Pro and screw

the cartridge fully home using the Allen Key. Guide the cartridge if necessary using your fingers to ensure that it is seated correctly.

(3) Replace the Pump Seal with the one provided with your

cartridge and replace the Front Cover. Refit the Allen Key into the bottom of the Impact Pro.

(4) Allow 20 minutes for the sensors to stabilise before first

use.

(5) To complete installation of the cartridge, switch the

Impact Pro on and accept the New Configuration when prompted to do so.

Using your SO

Cartridge

Please ensure that the following points are noted when the cartridge is in service.

(1) The operating temperature range of the cartridge

defaults to that of the lowest sensor fitted.

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8. ROUTINE SERVICING

(2) Always use PTFE tubing (maximum length of 500mm)

when calibrating the SO

channel.

(3) When performing a Span Calibration on the SO

channel it is good practice to flow SO2 calibration span gas through connected tubing for a minimum of 15 minutes without the flow adapter fitted to the Impact before attempting a span calibration. Failure to do so may result in a false calibration of the SO channel.

(4) The accuracy of the instrument must be functionally

(5) Apply calibration span gas at a rate of 300ml/min for a

period of 1 minute before starting the span calibration on the sensor.

(6) With regard to the actual sensors fitted, please perform

span calibrations on the sensors of the Impact cartridge in the following order: Cl

, NH3, H2S, SO2, CO,

Flammable.

(7) If the cartridge contains either NH

or H2S sensors

purge the system with air for a period of 15 minutes between NH

or H2S and SO2 calibrations to avoid

interaction between these gases.

(8) The sensors fitted to Impact may give responses to

gases other then the target gas. The table below gives typical sensor responses to various gases and should

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8. ROUTINE SERVICING

be used as a guide only. Note: Always use the target gas to perform sensor calibrations.

Applied Gas Effect on CO

Sensor

CO (100ppm) 100ppm 0ppm 0%v/v 0ppm 35ppm 1ppm

S (40ppm) 0ppm 40ppm 0%v/v -25ppm1 50ppm 1ppm

CO2 (0.5%v/v) 0ppm 0ppm 0.5%v/v 0ppm 0ppm TBA

Cl2 (5ppm) 0ppm 0ppm 0%v/v 5ppm 0ppm -2ppm1

NH3 (50ppm) 0ppm 0ppm 0%v/v -2ppm1 50ppm TBA

Hydrogen

(1000ppm)

SO2 (10ppm) 0ppm 0ppm 0%v/v 2ppm 0ppm 10ppm

Reading displayed as -0ppm.

200ppm 0ppm 0%v/v TBA 35ppm TBA

Effect on

H2S Sensor

Effect on

CO2 Sensor

Effect on Cl

Sensor

Effect on NH

Sensor

Effect on SO2

Special Notes for CO2 Cartridges

It is important that you read all of the notes below before installation or use of your new cartridge.

Installation of your CO

The cartridge is supplied on a Bias PCB to ensure that the sensor is ready to use when installed.

Cartridge

Sensor

To install the cartridge, follow the instructions below.

Note: Cartridge Installation or Replacement must never be

carried out in a hazardous area.

(1) If a cartridge was previously fitted to the Impact into

which the CO

cartridge is to be installed, remove the

Front Cover Grill using the Allen Key provided in the bottom of the Impact. Unscrew the screw in the centre of the cartridge and lift the cartridge from the Impact.

(2) Again using the Allen Key provided in the base of the

Impact instrument, unscrew the screw in the centre of the new CO

cartridge. Do not attempt to remove the

screw from the bottom of the Bias PCB. Remove the Bias PCB from the Cartridge.

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8. ROUTINE SERVICING

(3) Place the CO2 cartridge into the Impact and screw the

cartridge fully home using the Allen Key. Guide the cartridge if necessary using your fingers to ensure that it is seated correctly.

(4) Replace the Pump Seal with the one provided with your

cartridge and replace the Front Cover. Refit the Allen Key into the bottom of the Impact.

(5) To complete installation of the cartridge, switch the

Impact on and accept the New Configuration when prompted to do so. Note: This must be done

immediately after installation in order to maintain correct bias on the CO

sensor.

(6) Allow 20 minutes for the sensors to stabilise before use.

Note that the Impact may be in alarm condition during this time.

Using your CO

Cartridge

Please ensure that the following points are noted when the cartridge is in service.

(1) Always keep the instrument batteries charged or keep

fresh alkaline cells fitted when the cartridge is installed. Never allow the batteries to become drained.

(2) The operating temperature range of this cartridge is 0°C

to +40°C. Do not use the cartridge outside this range. The cartridge may be stored safely at temperatures down to -10 °C.

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8. ROUTINE SERVICING

(3) The CO2 sensor is suitable for use in Barometric

Pressures of 1013mBar ± 10%. Over this pressure range, the reading is directly proportional to Barometric Pressure.

(4) The calibration interval for the CO

sensor shall not

exceed 1 month. Owing to the characteristics of the

sensor a significant increase of reading can be

expected at temperatures below +10°C, and a significant decrease at temperatures above +30 °C. To ensure safe operation, always calibrate the instrument between +10 °C and +30 °C.

(5) The accuracy of the instrument must be functionally

checked with known concentration calibration gas before each day's use. If any sensor fails, recalibrate the Impact before using or replace the cartridge. Please refer to the Impact User Manual on how to calibrate.

(6) The sensors fitted to Impact may give responses to

gases other then the target gas. The table below gives typical sensor responses to various gases and should be used as a guide only. Note: Always use the target

gas to perform sensor calibrations.

Applied Gas Effect on CO

Sensor

CO (100ppm) 100ppm 0ppm 0%v/v 0ppm 35ppm 1ppm H2S (40ppm) 0ppm 40ppm 0%v/v -25ppm1 50ppm 1ppm

CO2 (0.5%v/v) 0ppm 0ppm 0.5%v/v 0ppm 0ppm TBA

Cl2 (5ppm) 0ppm 0ppm 0%v/v 5ppm 0ppm -2ppm1

NH3 (50ppm) 0ppm 0ppm 0%v/v -2ppm1 50ppm TBA

Hydrogen

(1000ppm)

SO2 (10ppm) 0ppm 0ppm 0%v/v 2ppm 0ppm 10ppm

Reading displayed as -0ppm.

200ppm 0ppm 0%v/v TBA 35ppm TBA

Effect on

S Sensor

Effect on

CO2 Sensor

Effect on Cl2

Sensor

Effect on NH3

Sensor

Effect on SO2

Sensor

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8. ROUTINE SERVICING

Charging Procedure for Impact Pro fitted with CO2 Variant Cartridges

If using Rechargeable Ni-MH Battery Packs, charging should always be carried out with the batteries removed from the instrument. This can be achieved by using the Zellweger Analytics Off-Line Charger. Part numbers of the chargers are given in this section.

(1) Remove the exhausted batteries using the special tool

found in the base of the instrument.

(2) Immediately place the instrument, with the batteries

removed, onto the Base Station, which is connected to a Power Supply Unit (PSU). This will ensure that the CO

sensor is correctly biased while the Battery Packs

are not present. Alternatively, fit fully charged batteries.

(3) Place the exhausted batteries into the Off-Line Charger,

ensuring that they are charged in pairs (one each side of the red 'Charge' LED). The Off-Line Charger can accept two pairs (4 total) of Rechargeable Battery Packs. The red 'Charge' LED will illuminate while the batteries as present.

(4) After charging is complete (12 hours minimum), remove

the Battery Packs from the Off-Line Charger. Remove the instrument from the Base Station and insert the Battery Packs. Tighten the retaining screw using the special tool.

(5) The instrument is now ready for use.

Note: The instrument does not have to be switched on during

this procedure, however if it is switched on a Warning 105 (see Section 11 Appendix A) will be shown. This should be accepted. In addition Fault 23 may be reported when the instrument is removed from the Base Station. If this occurs, the instrument should be switched off and back on again to reset the instrument.

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8. ROUTINE SERVICING

Off-Line Charger and Spare Battery Part Numbers

The following are the part numbers for the Off-Line Charger. Each variant is supplied complete with the relevant PSU for the destination country shown.

• Off-Line Charger Kit (Europe) [2302B1415]

• Off-Line Charger Kit (UK) [2302B1414]

• Off-Line Charger Kit (USA) [2302B1416]

• Off-Line Charger Kit (Australia) [2302B1417]

• Pair of Ni-MH Batteries

(UK, Europe, Australia) [2302B0842]

• Pair of Ni-MH Batteries (USA) [2302B2015]

Using Alkaline Dry Cells

If using Alkaline Cells (Duracell MN1500 or Energizer E91) and they require replacing, ensure that the batteries are not left out of the instrument for more than 15 minutes. This is to ensure correct biasing of the CO

sensor.

WARNING

The following points should be noted.

(1) The Bias PCB supplied with your CO

Cartridge contains a non-rechargeable lithium battery. Do not attempt to recharge the battery under any circumstances.

(2) Do not reuse the Bias PCB.

(3) Do not destroy the Bias PCB in fire.

(4) Dispose of the Bias PCB and cartridge

packaging in accordance with Local Regulations.

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8. ROUTINE SERVICING

Special Notes for NO2 Cartridges

It is important that you read all of the notes below before installation or use of your new cartridge.

Installation of your NO

Cartridge

Note: Cartridge Installation or Replacement must never be

carried out in a hazardous area.

(1) If a cartridge was previously fitted to the Impact Pro into

which the NO

cartridge is to be installed, remove the

Front Cover Grill using the Allen Key provided in the bottom of the Impact Pro. Unscrew the screw in the centre of the cartridge and lift the cartridge from the Impact Pro.

(2) Place the NO

cartridge into the Impact Pro and screw

the cartridge fully home using the Allen Key. Guide the cartridge if necessary using your fingers to ensure that it is seated correctly.

(3) Replace the Pump Seal with the one provided with your

cartridge and replace the Front Cover. Refit the Allen Key into the bottom of the Impact Pro.

(4) Allow 20 minutes for the sensors to stabilise before first

use.

(5) To complete installation of the cartridge, switch the

Impact Pro on and accept the New Configuration when prompted to do so.

Using your NO

Cartridge

Please ensure that the following points are noted when the cartridge is in service.

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8. ROUTINE SERVICING

(1) The operating temperature range of the cartridge

defaults to that of the lowest sensor fitted. The temperature range of the NO

(2) Always use PTFE tubing (maximum length of 500mm)

when calibrating the NO

(3) When sampling remotely (i.e. using the internal sample

pump or hand aspirator together with tubing) users should be aware of increased sample times. For NO the sample time will increase by approximately 90 seconds for every 10m of tubing used.

Sensor is -20°C to +50°C.

channel.

(4) When performing a Span Calibration on the NO

channel it is good practice to flow NO2 calibration span gas through connected tubing for a minimum of 15 minutes without the flow adapter fitted to the Impact before attempting a span calibration. Failure to do so may result in a false calibration of the NO channel.

(5) The accuracy of the instrument must be functionally

(6) Apply calibration span gas at a rate of 300ml/min for a

period of 1 minute before starting the span calibration on the sensor.

(7) With regard to the actual sensors fitted, please perform

span calibrations on the sensors of the Impact cartridge in the following order: Cl

, NH3, H2S, NO2, SO2, CO,

Flammable.

(8) If the cartridge contains NH

the system with air for a period of 15 minutes between NH

, H2S or Cl2 and NO2 calibrations to avoid

interaction between these gases.

, H2S or Cl2 sensors purge

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8. ROUTINE SERVICING

(9) The sensors fitted to Impact may give responses to

gases other then the target gas. The table below gives typical sensor responses to various gases and should be used as a guide only. Note: Always use the target

gas to perform sensor calibrations.

Applied Gas Effect on

CO Sensor

CO (100ppm) 100ppm 0ppm 0%v/v 0ppm 35ppm 1ppm 0ppm

H2S (40ppm) 0ppm 40ppm 0%v/v -25ppm1 50ppm 1ppm -3.2ppm1

CO2 (0.5%v/v) 0ppm 0ppm 0.5%v/v 0ppm 0ppm TBA TBA

Cl2 (5ppm) 0ppm 0ppm 0%v/v 5ppm 0ppm -2ppm1 5ppm

NH3 (50ppm) 0ppm 0ppm 0%v/v -2ppm1 50ppm TBA TBA

Hydrogen

(1000ppm)

SO2 (10ppm) 0ppm 0ppm 0%v/v 2ppm 0ppm 10ppm 0ppm

NO2 (10ppm) 0ppm 0ppm 0%v/v 0ppm -5ppm1 -10ppm1 10ppm

Reading displayed as -0ppm.

200ppm 0ppm 0%v/v TBA 35ppm TBA TBA

Effect on

H2S

Sensor

Effect on

CO2

Sensor

Effect on

Cl2 Sensor

Effect on

NH3 Sensor

Effect on

SO2 Sensor

Effect on

NO2 Sensor

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9. SPARE PARTS

The following spare parts are available from Zellweger Analytics authorised Service Centres, in addition to the accessories listed in Section 6. ACCESSORIES.

(1) Dry Cell Battery Holder (2 off) 2302B0770 (2) NiMH Rechargeable Battery Pack (2 off) 2302B0842 (3) Front Cover Grille Assembly 2302B1315 (4) Stainless Steel Filter Kit (10 off) P2302D0823 (5) Front Cover O-ring Kit (10 off) 2302B1300 (6) Rear Cover O-ring Kit (10 off) 2302B1301 (7) Top O-ring Kit (10 off) 2302B1302 (8) Sounder Rear Membrane Kit (10 off) 2302B1303 (9) Interface PCB Seal 1 Kit (10 off) 2302B1304 (10) Interface PCB Seal 2 Kit (10 off) 2302B1305 (11) Battery O-ring Kit (10 off) 2302B1306 (12) Pump Seal Kit (10 off) 2302B1307 (13) Front Cover Membrane Kit (10 off) 2302B1308 (14) Sounder Front Seal Kit (10 off) 2302B1309 (15) Pump Blank Kit 2302B1310 (16) Pump Adaptor Kit P2302B0814 (17) Pump Upgrade Kit 2302B1091 (18) In-line Hydrophobic Filter (10 off) 2302B0845 (19) Cartridges (as per original supply, contact Zellweger

Analytics or distributor)

(20) Replacement Sensors for Serviceable Cartridges

(contact Zellweger Analytics or distributor). (21) USA Dry Cell Battery Holders (2 off) 2302B2016 (22) USA Ni-MH Rechargeable Battery Pack (2 off)

2302B2015 (23) USA Front Cover Grill Assy 2302B2017

Note: In order to meet Certification Requirements, fit only

Zellweger Analytics component approved flammable

sensor.

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10. GLOSSARY

BASEEFA British Approvals Service for Electrical

Equipment in Flammable Atmospheres – UK Safety Certification

Catalytic Sensor For detection of combustible gases.

These are made of an electrically heated platinum wire coil, covered first with a ceramic base such as alumina and then with a final outer coating of palladium or rhidium catalyst dispersed in a substrate of thorium.

CE Indicates compliance to all relevant

European directives

Cell An individual sensor

CENELEC Comite Europeen de Normalisation

Electrotechnique – European Safety Certification

COSHH Control of Substances Hazardous to

Health

CSA Canadian Standards Association

dBA Decibels, relative to the A weighting

scale (as affected by the human ear).

Electrochemical SensorA gas sensitive electrode, formed by a

permeable membrane and special electrolyte.

EMC Electromagnetic compatibility.

ESD Electrostatic discharge.

Gas Analyser Normally refers to equipment used to

measure extremely small concentrations of gas (low or sub ppm) or one specific gas in the presence of several others.

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10. GLOSSARY

Gas Detector or Monitor Refers to equipment designed to alert the

user to potentially hazardous concentrations of gas in the monitored atmosphere.

Hard Zero When a hard zero is performed using

either the built-in calibration menu or the PC software then any adjustments will remain in place when the instrument is turned off. Performing a hard zero followed by an Enforcer calibration, instrument menu span or PC calibration will adjust the calibration and change the calibration due date.

Hazardous Areas Areas where there is the possibility of

the presence of an explosive mixture of flammable gas or vapour and air are known as ‘Hazardous’ and other areas as ‘safe’ or ‘non-hazardous’. Any electrical equipment used in hazardous areas must be tested and approved to ensure that, in use even under fault conditions, it can not cause an explosion.

In Europe, hazardous areas are defined as follows:

Zone 0: An area where an explosive mixture is likely to be present at all times, under normal operating conditions. Zone 1: An area where an explosive mixture is likely to occur in normal operation. Zone 2: An area where an explosive mixture is not likely to occur in normal operation, and if it does it is only for short periods.

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10. GLOSSARY

In the US, hazardous areas are classified in 2 divisions:

Division 1: Equates to Zone 0 and Zone 1 Division 2: Equates to Zone 2

Intrinsically safe (approval by an appropriate authority to

use the instrument in hazardous area).

IP Ingress Protection – a measure of

protection against the ingress of dust and water

IS Intrinsically Safe (approval by an

appropriate authority to use the instrument in hazardous area).

LED Light emitting diode.

LEL Lower Explosive Limit – is the lowest

concentration of ‘fuel’ in air which will burn and for most flammable gases and vapours it is less than 5% by volume.

LEL% Percentage of the Lower Explosive

Limit (for example, 10% LEL of methane is approx 0.5% by volume).

LTEL Long Term Exposure Limit. The 8 hour

LTEL is the time-weighted average concentration for a normal 8 hour day to which most workers may be repeatedly exposed, day after day, without adverse effect.

Oz Ounce (weight).

Peak Maximum, or minimum, measurement

since switch on.

Pellistor Registered trade name for a

commercial device – A very small sensing element used in catalytic

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10. GLOSSARY

sensors and sometimes also called a ‘bead’ or a ‘siegistor’.

Poison resistant Capability of a catalytic sensor to

reduce the effect of inhibiting substances or contaminants, such as silicones.

PPB Parts per billion concentrations in the

atmosphere.

PPM Parts per million concentrations in the

atmosphere.

RFI Radio frequency interference.

Safe Area Work area in which there is no danger

of contamination with explosive gases.

Soft Zero When a soft zero is performed (i.e. the

autozero on startup) any adjustments will only remain in place whilst the instrument remains switched on. Performing a soft zero (autozero) followed by an Enforcer calibration or instrument calibration menu span (i.e. not a menu zero first) will adjust the calibration whilst the instrument remains switched on but will not change the calibration due date.

STEL Short Term Exposure Limit, usually

monitored over 15 minute periods

TWA Time-Weighted Average

UEL Upper Exposure Limit

UL Underwriters Laboratories (USA)

%VOL Concentration of gas, measured in

percentage by volume.

%V/V Another way of representing %VOL

100

Honeywell Lumidor Impact, Impact Pro Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual