Casella CEL CEL-424 User Manual

Page 1

CEL-420/460

C M p M s

Issue: 4

If you want to get on and use the instruments without any background information, skip Section 3 and go straight to Section 4.

USERS GUIDE

1. Display

ata is Being Recorded

Battery Condition Overload has

Occurred

easurement

dentity or Date

urrent Operating

ode, Repeatedly

ressing the

ENU key will

elect each of these in turn

SLM

REC

C-A

DOSE SET UP OPTION

Measurement is Paused

Frequency Weighting

Indicates Active

dB%

960081e

Current Data or Time

Option Keys

Current Units

2. Keys

Display

Switches dosimeter ON/OFF

Changes operating mode)

Accesses stored data

Select active options from the current menu

DATA

Starts/Pauses/Restarts a measurement record

Confirms actions of other keys

Stops a measurement when

followed by

SET

STOP

ENTER

960080

CEL-420/460 Getting Started - Page 53

Page 2

3. Introduction to the Dosimeters

The CEL-420 and CEL-460 Noise Dosimeters measure the frequency weighted noise exposures and peak sound levels simultaneously. The dosimeter microphone and lead on both models can be replaced by a sound level meter microphone to offer comprehensive sound level measurement. The dosimeters have the following features.

¤ Four built-in standard dose measurement setups:

OSHA, DOD, ISO85* and ISO90*,

¤ Up to three user specified dose measurement setups, ¤ A single sound level meter setup, ¤ Sixteen dose result stores, ¤ User selection of up to two profiles attached to each

CEL-460 dose measurement,

¤ Self configured storage.

The instruments are built to withstand rough industrial conditions with cases formed from a polyester/polycarbonate material that gives them a high resistance to damage. Data integrity is further protected by a dose microphone lead which is designed to resist knocks and abrasions without affecting the signal passing from microphone to instrument.

Both instruments can be operated and deliver dose and SLM results without the need for other equipment, beyond an acoustic calibrator. However, they become even more versatile when their measurement and setup data is downloaded to a PC using the CEL-6702 dB10 or CEL-6704 dB12 Windows™ based software.

These programs have the facilities expected of fully featured Windows™ packages offering post processing, cut and paste between applications and comprehensive word processing capabilities. In addition, dB12 has extensive on screen graphing facilities.

3.1 Sound Level Meter and Intrinsically Safe Models

Both dosimeters can be converted to a miniature sound level meter by fitting a CEL-425 SLM Microphone Adaptor. The CEL-420 then becomes a CEL-424 SLM, while the CEL-460 becomes a CEL-464. For sound level meter operation refer to Chapter 8.

Intrinsically safe versions are available of both dosimeter and sound level meter versions, with the full model line up shown in Table 1.

Table 1: Models Available

Standard Model

CEL-420 CEL-422 Noise Dosimeter CEL-424 CEL-426 Sound Level

CEL-460 CEL-462 Noise Dosimeter CEL-464 CEL-466 Sound Level

IS Model Description

Meter

Note*: ISO procedures using Criterion 85 dB and 90 dB.

Page 54 - CEL-420/460 Getting Started

Page 3

Intrinsically safe versions are rated to EEx ia IIC T4 for use in zones 0, 1 and 2 with IS Certificate Number - Ex97E2110X tested to EN50020 (this corresponds to CENELEC apparatus group IIC, North American grouping Class1).

3.2 CEL-420 Noise Dosimeter (& CEL-422/424/426)

The following features also apply equally to the CEL-420/422/424/426. The CEL-420 series instruments are ideal for quick on-site surveys and for monitoring personal noise exposure in accordance with European ISO or USA OSHA and DOD standards. For dose measurement, they are passive instruments with settings that may be reviewed by key strokes, but which can be selected only by means of the dB10 (or dB12) software. However, all sound level measurement parameters can be set from the keypad.

There are overlapping measurement ranges: 50-120 & 70-140 dB, A & C RMS weightings, Linear & C Peak

Table 2: Setups and Configuration Files

Parameter settings that do not modify preset measurement protocols can be changed by using the instrument keys.

All available parameter settings can be changed from a PC by means of dB10 or dB12 Software.

Parameter settings that modify preset measurement protocols must first be saved by dB10 or dB12 under a new setup identity in an instrument

"configuration file"

instrument set of setups, i.e. up to seven dose setups, one SLM setup, and one timer setup common to all dose setups.

Parameter settings on an instrument can be changed ONLY by using either dB10 or dB12 to replace the configuration file in the instrument by another configuration file loaded from the PC.

"configuration file

contains a complete

weightings, Fast, Slow & Impulse time weightings, and energy exchange rates (Q) of 3, 4, 5 & 6. In dose measurement mode, they display % dose, % dose projected for an 8 hour period, peak level and measurement duration.

For those countries which are subject to European Union regulations or the equivelent ISO standards, the instruments measure the daily sound exposure level (L cal with the L

required by ISO 1999), while for USA OSHA regula-

EX,8h

Aeq,8hr

Pa2h according to IEC 1252, that is identi-

tions they measure the Time Weighted Average Level (TWA).

When used as a sound level meter they display sound level, maximum sound level, peak and time-averaged (L

Aeq

or L

Avg

) sound

levels.

3.3 CEL-460 Logging Noise Dosimeter

(& CEL-462/464/466)

The following features also apply equally to the CEL-460/462/464/466. The CEL-460 series instruments are recommended for detailed measurements as they feature extended processing and memory functions. There is an additional 30-100 dB measurement range that can be used for environmental surveys, and automatic run timing facilities controlled

CEL-420/460 Getting Started - Page 55

Page 4

by the built-in clock. There are time-history recording capabilities that allow up to two profiles to be saved with each dose result set in a separate profile store. Sampling times can be specified between 1 s and 1 hour, while profile storage is in excess of 50 000 data points.

The instruments are able to measure and save up to five user

specified L

values (exceedance level percentiles). Run durations speci-

fied via instrument keys, by dB10 or dB12, and start and stop times preset via dB10 or dB12 can be switched on or off from the instrument keys. Other settings can be changed only by dB10 and dB12 Software.

When data saved by a CEL-460 instrument is downloaded to a PC, the user can specify a period over which to re-calculate projected % dose values. The software can also calculate six exceedance time percentiles with levels preset to values specified by measurement standards, plus one user specified time percentile.

4. Install Battery & Microphone

Connect a new 6LF22 or equivalent 9 V battery to the terminals in the battery compartment in the rear of the instrument.

With the instrument switched OFF, insert the lead connector of the CEL-6681 Dosimeter Microphone (or the connector on the CEL-425 SLM Adaptor stalk) into

960079

the socket on the top end of the case with the red dot facing the front of the dosimeter.

CEL-425 SLM Adaptor

Remove the

connector ONLY by pull-

Red "Dot"

ing on the knurled sleeve.

DATA

SET

STOP

ENTER

CEL-6681 Dosimeter Microphone

990022

For IS versions, use ONLY Duracel® MN1604 batteries. Install and remove the battery and microphone ONLY in a non-hazardous area.

Page 56 - CEL-420/460 Getting Started

Page 5

5. Perform Acoustic Calibration

Operations are performed by a sequence of key strokes.

Perform a field accuracy check each time the instrument is switched ON using a CEL-282 (Class 2) or CEL-284/2 (Class 1) Calibrator as follows.

Fit the microphone into the CEL4725 Coupler supplied with the calibrator, making sure it is pushed firmly into contact with the shoulder in the coupler cavity. Then fit the coupler complete with microphone into a CEL-282 (or CEL-284/2) Calibrator, again ensuring that it makes contact with the shoulder in the calibrator cavity. (To aid removal, the coupler flange does not fit close against the calibrator housing).

Switch the calibrator ON, then follow the instruction after the Start Up sequence of displays has finished.

Operation Press Display Shows Comments

1. Switch the instrument ON

2. Change Operating Mode

re- peatedly

Calibrator

O'Ring

Microphone Coupler

1/4" Microphone

Start Up messages show: Instrument Type, Serial Number (when set), Print (when printer cable connected), Firmware Version,

Current Date, Time, Battery Condition and last used Measurement Mode.

To select OPTION, to enable Acoustic Calibration, it shows current SPL.

Shoulder

980057

3. Enable Level Change

4. Change Indicated Level

CEL-420/460 Getting Started - Page 57

and are now enabled. The display shows current sound level.

Press or . Indicated level rises (falls)

0.05 dB for each key press. Adjust to correct level for CEL-420/460 microphones at standard temperature and pressure:

113.6 dB

Page 6

Operation Press Display Shows Comments

5. Set Calibration Level

The 113.6 dB calibration level is now set, and will be stored by the microphone assembly.

6. Select Measurement Setup

Operation Press Display Shows Comments

1. Change Operating Mode

2. Select another Set Up

3. Load Selected Set Up for use

re- peatedly

several times

To select SET UP. The first display always shows the currently loaded Setup, (for example OSHA dose measurement).

Select required Set Up from OSHA dose procedures, DOD dose procedures, ISO85 dose procedures, ISO90 dose procedures, SLM (see Section 9).

Loaded messages show Setup is now active (for example ISO procedure with 90 dB Criterion).

7. Measure Dose

Operation Press Display Shows Comments

1. Change Operating Mode

re- peatedly

This is Dose Measurement. Dose data will be saved in the next available data store.

2. Start Run The instrument waits showing

3. Then REC icon indicates that the

4. Inspect data from Current Run

5. Inspect further data from Current Run

6. If Required Pause the run.

Page 58 - CEL-420/460 Getting Started

several times

Data from Current Run The display cycles through

pause icon until the next whole clock minute, while the display counts seconds back to zero.

instrument is now storing dose data.

Duration of current run as hh:mm:ss.

data from current run. Displays will be updated while the run is in progress.

The pause icon (II) is shown. Press this key again to resume the run.

Page 7

Operation Press Display Shows Comments

7. If Required PLUS

To lock keys and display to prevent unauthorised tampering.

8. If Required PLUS

9. Stop Run Stop ? This command must be

10. Confirm Stop The Run is now ended.

To unlock keys and display to restore normal operation.

confirmed.

8. Recall Dose Data

Measurement data is stored in the DOSE operating mode and is acces-

sed using the key. Current data can be inspected while the instrument is recording. When the instrument is stopped, with no data being saved, stored data can be retrieved and displayed.

8.1 Review Data From Current Run

Operation Press Display Shows Comments

1. Inspect Data

From Current Run

2. Inspect

Further Data From Current Run

repeat

Data from Current Run Display cycles through data

8.2 Review Stored Data

Stored data is identified by date and measurement start time and up to 16 runs can be stored simultaneously before the memory is overwritten by a "first-in/first-out" process.

Operation Press Display Shows Comments

1. Enable Data

Recall

This shows the dose value accumulating during the current run. This value will be updated while the run progresses.

from current run. Displays will be updated while the run progresses.

With the instrument stopped,

operation of displays the Start Date & Time for the most recently stored run.

CEL-420/460 Getting Started - Page 59

Page 8

Operation Press Display Shows Comments

2. Review Stored Runs

repeat

Select Start Date & Time for required run (for example 25 Sep 08:15:00).

3. Review Stored data

repeat

The display cycles through data from the selected run.

If a printer is connected and switched on, the first data display shows PRINT READY (see Section 8.3).

8.3 Print Standard Report

With the dosimeter switched OFF, use both the C6671 and CEL-6672 Cables to connect the instrument to a Centronics printer as shown. This allows the dosimeter to recognise the printer cable during its Start Up sequence.

Only stored data can be printed, as a printer cannot be connected to the dosi-meter at the same time

960087

as the microphone.

Operation Press Display Shows Comments

1. Switch instrument ON

C6672 Active

Printer Cable

Centronics Printer

Switch on both dosimeter and printer.

Switch the printer On-Line.

Communications

C6671

Cable

CEL-420/

CEL-460

Series

2. Enable Data Recall

3. Select Stored Run For Printing

4. Activate Printing

Page 60 - CEL-420/460 Getting Started

repeat

With the instrument stopped, display the Start Date & Time for the most recently stored run as described in Section 8.2.

Select Start Date & Time for required run (for example 25 Sep 08:15:00).

When the printer is connected and switched on, the first data display shows PRINT READY. If the printer is switched off, the display will show PRINT OFF.

Page 9

Operation Press Display Shows Comments

5. Print Hard Copy

The display shows busy print messages while printing data set from selected run in standardised format for measurement protocol used.

9. Use as a Sound Level Meter

SLM settings can be changed via the instrument keypad. Connect the CEL-425 SLM Adaptor (as described in Section 4), perform an acoustic calibration as described in Section 5, then proceed as follows.

Operation Press Display Shows Comments

1. Start from the final Start Up Display

The last used measurement mode will be selected.

2. If required, change Mode

3. If required change Set Up

4. Activate SLM Operation

6. Review SLM Measurements

7. Final Measurement

8. Switch OFF Blank Screen No operations are possible.

Re- peatedly

re- peatedly

several times

The first Setup in sequence shows the currently loaded setup, which may be either for dose or SLM measurement.

This is operation as a SLM.

SLM measurement is active with the current SPL displayed.

When & menu option icons are shown on the display, the relevant menu keys may be used to change the current measurement settings.

The display steps through all details and parameters starting with Peak measurement.

This completes the cycle back to first SLM display.

CEL-420/460 Getting Started - Page 61

Page 10

10. Selecting & Changing Options

The OPTION operating mode contains the part of the program which allows the following items to be checked or adjusted.

Acoustic calibration (see Section 5), Adjustment of the calendar clock and time, Battery voltage, Communication status when the dosimeter is connected to a

PC for use with dB10 or dB12 Soundtrack Software,

Activating the run timer commands set by dB10 and dB12

(only on a CEL-460),

Microphone temperature (

10.1 Review Options

Operation Press Display Shows Comments

1. Start from the Final Start Up Display

C).

2. Change Mode

3. Next Option

several times

Re- peatedly

Optional operations showing SPL for acoustic calibration, refer to Section 5.

The display cycles through the rest of the options: Current Time,Current Date, Battery condition, Communication status, Timer status (CEL-460 only), Microphone Temperature.

10.2 Change Time & Date

Operation Press Display Shows Comments

1. Select Time Option

2. Enable Time Change

3. Change Hours, Minutes, Seconds

Page 62 - CEL-420/460 Getting Started

Follow on from Section 10.1.

Cursors are enabled and the hours entry blinks to show it can be edited.

Use the cursor keys to highlight a figure and to change it.

Page 11

Operation Press Display Shows Comments

4. Save the Changes

The new time setting is stored.

Repeat this process in the Date Option to change the date.

10.3 Change Timer & Run Duration (CEL-460 only)

Operation Press Display Shows Comments

1. Select Timer Option

2. Switch Timer ON

3. Review Start Times

4. Review Stop Times

Repeat

Follow on from Section 10.1.

Displays that are only found on a CEL-460 are shown with a dashed outline----.

Timer is now ON. Any start and stop times loaded via dB10 or dB12 will be used, UNLESS Duration settings are enabled as in steps 6 to 8.

This is the First Beginning (start) time set by dB10 (or dB12): dd.hh:mm. The day setting is the day of the month. When day "- -" is indicated, measurement will start on the current day.

If Duration times have been enabled, the display shows a duration setting as in Step 8.

First End (stop) time set by dB10 (or dB12): dd.hh:mm.

5. Select Duration Option

6. Switch Duration Timer ON

Press to enable/ disable each Beg/End timer pair. When a pair is disabled, its settings will be displayed as "- -

----". Continue from Section 10.1.

The Run Duration Status is shown OFF. When a run duration period is shown as in Step 6, any preset start and stop times will NOT be used.

The status message blinks to show it can be changed.

CEL-420/460 Getting Started - Page 63

Page 12

Operation Press Display Shows Comments

7. Change Duration

8. Set This Duration Time Setting

several times

Step through available durations:

8.00, 4.00, 2.00, 1.00 hour, 30, 15, 10, 5 min, OFF, and select a suitable duration.

Run Duration is now set, (for example 4.00 hour) and this setting will take precedence over any Timer settings.

11. Specification

Electro-acoustic Standardisation:

Dosimeter/Sound Exposure Meter:

IEC 1252: 1993, BS EN 61252, ANSI S 1.25 - 1992.

Sound Level Meter:

IEC 804: 1985 (EN 60804: 1994) Type 2, IEC 651 : 1979 (EN 60651 : 1994) Type 2 ANSI SI.4 - 1983 Type S2.

Electro-magnetic Standardisation:

EN 50081-1 :1992, EN 50081-2: 1993, EN 50082-1 :1992, EN 50082-2: 1995.

Reference level, frequency, range, integrating time and sound exposure.

114.0 dB, IkHz, 70 - 140 dB, 30 seconds, 0.84Pa2hr.

Pulse Range:

>53 dB

Measurement Ranges:

Display Range (dB) Primary RMS range

30 - 100 (CEL-460 only) 41 - 86 63 - 103 50 - 120 55 - 106 83 - 123 70 - 140 75 - 125

at 1 kHz

Defined from 10 dB above noise floor to a crest factor limit of 5

Weightings:

Clock:

Frequency: Time: Amplitude:

(CEL-460 Series only)

A, C and linear 20Hz - 20kHz,

Fast, Slow, Impulse, Peak,

3, 4, 5, 6 dB exchange rates.

Date and time can be set from the keypad. Date and time can be set to PC time via dB10 and dB12.

Dose Measurement Timer:

(CEL-460 Series only)

Use with pre-programmed delayed start and stop times, or with fixed measurement durations can be selected from the keypad.

(Start and Stop times must be programmed via dB10 and dB12.)

Page 64 - CEL-420/460 Getting Started

Peak

103 - 143

Page 13

Dose Measurement Start/Stop Delay Timer:

Delay intervals can be set only via dB10 and dB12. Settings can be specified for up to 16 sets of start and stop times, up to

30 days ahead. The clock indicates the time remaining before the next run starts.

Dose Measurement Elapsed Time Timer:

Measurement elapsed times (run durations) can be selected from the keypad. The following options are available:

Disabled, 5, 10, 15, 30 minutes, 1, 2, 4, 8 hours.

Overload Indication:

140.1 dB RMS.

Maximum Peak Value:

143.0 dB Peak Linear.

Non-Linear Distortion:

Error <±1 dB at frequencies >10 Hz.

Warm-Up Time:

5 minutes.

Stabilisation Time:

1 second.

Operating Environment:

Temperature ± 0.5 dB: -10oC to +50oC, Atmospheric Pressure: 65 - 108 kPa, Humidity ± 0.5 dB: 30% - 90% (non-condensing), Magnetic Fields: Negligible, Vibration: Negligible, EMC: See standardisation.

Dimensions and Weight:

Metric: 120 x 65 x 30 mm and 260 g (IS versions: 300 g). US: 4.8 x 2.6 x 1.2 inches and 9 oz (IS versions: 11 oz).

(CEL-460 Series only)

12. CE Compliance

All models of the CEL-420 and CEL-460 Dosimeters comply with the EMC Directive 89/336/EEC of the European Union. They have been tested according to the standard delivery schedule and comply with the following standards.

EN 50081-1 : 1992, EN 50081-2 : 1993: Generic emission standards for residential, commercial, light industry and industrial environments.

EN 50082-1 : 1992, EN 50082-2 : 1995: Generic immunity standards (for both RF fields and electrostatic discharge) for residential, commercial, light industry and industrial environments.

CEL-420/460 Getting Started - Page 65

Page 14

13. Intrinsically Safe Models

Four models in the CEL-420/460 series are available with Intrinsic Safety approval for use in hazardous areas. Their instrument numbers are shown in the table.

The operation of each model is identical to its non-IS counterpart. The Noise Dosimeter versions use the standard CEL-6681 microphone on a 0.75 m cable for personal use whereas the sound level meter versions use the standard CEL-425 microphone adaptor.

The Intrinsically Safe versions are fitted with a different firmware version but are functionally identical to the standard products. They may be connected to a personal computer for setup and download of results using the CEL-6702 or 6704 Windows software packages.

Products rating - to EEx ia IIC T4 for use in zones 0, 1 and 2. Intrinsically Safe Certificate Number - Ex97E2110X tested to EN50020 (this corresponds to CENELEC apparatus group IIC, North American grouping Class1).

Approved Power Supply

Only the Duracel® MN1604 alkaline type battery may be used in these meters (9 V radio battery). The use of any other battery will invalidate the intrinsically safe certification.

Battery Life

Approximately 30 hours under typical conditions.

Special instructions

The battery must be replaced only in a non-hazardous area.

The instruments must be calibrated in a non-hazardous area following the same instructions as for the standard models.

Any repairs needed for the Intrinsically Safe models must be carried out only by an approved CASELLA CEL service centre following approved written procedures.

Standard Model

CEL-420 CEL-422 Noise Dosimeter CEL-424 CEL-426 Sound Level

CEL-460 CEL-462 Noise Dosimeter CEL-464 CEL-466 Sound Level

IS Model Description

Meter

Page 66 - CEL-420/460 Getting Started

Page 15

14. Instrument Servicing & Warranty Arrangements

To ensure its conformity with the specification, this instrument is thoroughly inspected and it's accuracy verified prior to dispatch. All technical information is filed under the instrument serial number, which should, therefore, be quoted in any correspondence.

The manufacturers undertake to rectify any defect in the instru-

ment that is directly attributable to faulty design or assembly, and which becomes apparent during the warranty period. In order to take advantage of this warranty, the instrument must be returned, carriage paid, to the manufacturer's factory or accredited agent, where necessary repairs will be carried out.

The warranty period runs for 12 months from the date of receipt

of goods, with exceptions on certain specialised components supplied by other manufacturers which may be warranted for shorter or longer periods by their actual manufacturers. In all such cases, the benefit of these undertakings will be passed on to the user.

CASELLA CEL's liability is limited to items of their own manufac-

ture, and they do not accept liability for any loss resulting from the operation or interpretation of the results from this equipment.

To obtain repair under warranty, the instrument should be

packed and returned in it's original packing or an equivalent either to CASELLA CEL's local agent, or in the case of domestic sales, to the CASELLA CEL Service Department at Bedford. Please include the following information:

Instrument Type(s), Serial Number(s) and Firmware Version

Number(s), Customer name and address, Contact name and phone number, Details of any PC and Software involved, including Version

Number(s), Reason for returning the equipment with a detailed description

of the fault, List of any error messages that may have been displayed.

The necessary adjustments or repairs will be carried out, and the instrument returned as soon as possible.

A comprehensive Instrument Calibration Maintenance Agree-

ment (ICMA) scheme is available to extend the initial warranty period of this instrument. At the end of the first warranty period, it is recom-

CEL-420/460 Getting Started - Page 67

Page 16

mended that the equipment be returned to the Service and Verification Department at Bedford, where it will be inspected and entered into the ICMA scheme as required. The warranty will then be extended for the period stated on the individual schedule. Please contact your local CASELLA CEL agent for full details of this service.

After the warranty has expired (except on approved accounts) service work is undertaken against quotations, and all packing and transit costs are charged extra.

Page 68 - CEL-420/460 Getting Started