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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