Munro L60iF Manuel utilisateur
Munro Instruments, 44-45 Burnt Mill, Elizabeth Way, Harlow, Essex, CM20 2HU, UK
Email info@munroinstruments.com Phone +44 (0) 20 8551 7000 www.munroinstruments.com
Registered in England 06965050 Vat: GB 977 7939 30.
L60iF
Large Vol
ume Air Sampler
Instruction Manual
Munro Instruments, 44-45 Burnt Mill, Elizabeth Way, Harlow, Essex, CM20 2HU, UK
Email info@munroinstruments.com Phone +44 (0) 20 8551 7000 www.munroinstruments.com
Registered in England 06965050 Vat: GB 977 7939 30.
L60iF Large Volume Air Sampler with Integrated Flow and Volume Display
INSTRUCTION MANUAL
Contents
Chapter
Description
Page
1
Introduction
1
2
Specification
3
3
Installation & Operation
5
3.1 Installation
5
3.2 Preparation for sampling
5
3.3 Taking a sample
9
4
Technical Description
10
5
Maintenance
11
5.1 Regular maintenance
11
5.2 Servicing
11
5.3 Fault location
11
6
Re-calibration
12
6.1 Basic Calibration
13
6.2 Temperature compensation
14
7
7.1 Order Codes
16
7.2 Training Courses
16
8
Diagnostic Mode
17
Appendix 1
A1.1 Temperature compensation
20
A1.2 Accuracy of Reading
21
A1.3 Changing the Eprom
22
Appendix 2
Flow charts for Operator, Supervisor,
23
Calibration and Diagnostic modes.
L60iF Issue 9 November 2018 1
1. Introduction
There is an ever-increasing demand for greater accuracy in the measurement of pollution in the workplace
environment. This has forced a review of the traditional methods of air sampling in which the sampler flow
rate gently drifts over the sampling period, making exact calculation of sampled volume difficult.
One solution to this problem has been to stabilize the flow rate against variations in power supply and
changes in filter restriction as pollution is collected. However, this technique is best suited to low flow
personal samplers.
The approach taken in the L60iF is to assume that the precise flow rate is not as important as the exact
volume of air sampled, within reasonable limits, because the average flow rate is only used to calculate
volume sampled. This approach means that the flow rate requires no stabilization, and will depend on the
type of filter medium as well as the collected pollution level, power supply variations and changes in pump
performance as it warms up. To ensure that flow rate changes are accurately ‘tracked’, the average flow is
measured over a short interval, typically one second, and the calculated volume of air sampled is added to
the previous accumulated total. Use of a very short integrating or averaging interval ensures that flow rate
changes are automatically allowed for, because such changes take place over relatively long periods, minutes
or even hours.
The prime mover is a Munro Instruments L60 Pump and Motor unit. Over the years, improvements in motor
design and manufacture of pump parts have resulted in a much higher pump specification than used to be
the case.
Flow rate is derived by measuring the pressure drop across an orifice in the airline. The electronic signal is
then manipulated to derive a flow rate, which is both displayed and used for volume calculation.
The unit is controlled using a Vacuum Fluorescent display and four buttons (m
m
,
n
,
p
and
o
). The button
functions in any mode are shown on the display and allow the operator to run whatever test has been
selected by a supervisor. The operator can also display the results of the previous test; the information
includes an indication as to how the test ended.
If the power supply to the sampler is interrupted during a test, the test will resume when power is restored
(subject to a number of conditions).
In supervisory mode, the type of test required can be set up and other parameters can be checked and
changed if required.
The Sampler can be calibrated against a traceable flow meter using a built-in routine.
A comprehensive series of diagnostic displays show the history of the sampler and pump unit plus complete
calibration data.
The pump and motor are cooled by a fan, the air drawn into the sampler being filtered at the inlet point.
The outer surfaces of the sampler are simple with the minimum number of corners, recesses and so on. This
makes decontamination much easier.
The sampler is also designed for ease of maintenance. The front panel can be removed to allow access for
replacement of vanes without removing the pump and motor. The cooling fan is protected by a gauze filter
that is easily cleaned and replaced.
L60iF Issue 9 November 2018 2
2. Specification
Flow rate Nominal 60 litres per minute. The actual flow depends on the filter medium e.g. filter paper,
Maypack filter, etc. Flow will also be affected by the length and size of connections, for
example to a duct. Typical flow using a Maypack filter 55 litre/minute.
Display Vacuum Fluorescent. Display data is selected by menu keys as follows:
Operator Mode (See flow chart at rear of manual)
1. Time/date - opening and default display with option to start programmed test or display
result of last test.
When run test is selected, appropriate displays indicate the type of test in progress and once
it is complete, the results of the test. (The operator can cancel a test in progress at any time
by switching off the sampler)
Supervisory mode (See flow chart at rear of manual)
The following test modes can be selected for running in operator mode. Once selected they
will be available to the operator until changed.
1. Immediate start and stop after selected time.
2. Immediate start and stop when selected volume sampled.
3. Delayed start and stop after selected test period.
4. Delayed start and stop when selected volume sampled.
5. Immediate start and run until manually stopped.
The following parameters can also be viewed and changed if required.
6. Test results - displays results of last 250 tests.
7. Low & high flow alarm - user selected flow rates at which low or high flow
alarm is raised and test is aborted.
8. Real time - displays real time for possible correction.
9. Date - displays date for possible correction.
10. Mute the audible alarm.
11. Set Auto resume parameters or turn the feature off.
Accuracy Flow and total volume - depends on the accuracy class of the rotameter flow gauge used for
calibration. Initial calibration of flow rate will be r2% of reading. The user can improve on
this if required. Accuracy of total measured volume will be similar to that of the flow.
L60iF Issue 9 November 2018 3
Display resolution (Volume)
While the total volume sampled is less than 1000 litre, the display is in litres to one decimal
point, for example
738.3 litres
When the volume exceeds 1000 litres but is less than 100,000 litres, the decimal place is
dropped, for example
1429 litre or 83445 litres
When the volume sampled exceeds 100,000 litres, (100 m³) the display changes to cubic
metres to one decimal place, for example
0108.6 cu.m or 0743.9 cu.m
The maximum value is 9999.9m³. Therefore the sample will stop and the display shows OV
after approximately 115 days of continuous sampling.
The user has the option of displaying m³ at all times or using the Auto mode described above.
Calibration The unit can be calibrated using a certified flowmeter, a flow controller (restriction valve)
and the inbuilt calibration routine. A fuller temperature calibration can also be undertaken if
required.
Prime air Sliding vane pump (4 vanes)
mover
Motor type 1400 rpm induction; permanent capacitor.
& rating 220/240V ac 50Hz 0.65A; 110/120V ac 50Hz 1.3A
Motor Overload cutout trip; rating 2A. Typically cut out operates within
protection 40s if the motor stalls.
Dimensions 300 x 152 x 305 mm
Weight 14 kg
Accessories The following items are available:
Inlet adapters for Maypack or card-mounted filters
Extension hose to allow sampling head to be located up to 2.5m from the sampler.
Anglepoise trolley to support remote sampling head.
A variety of filter papers.
DC/AC Converter to enable the L60iF to operate from a 12V d.c. source in a vehicle. (Current
requirement is approximately 15A) This converter is only recommended for use in a vehicle.
L60iF Issue 9 November 2018 4
3. Installation and operation
3.1 Installation
The L60iF is a portable instrument with a permanently connected mains cable. Unless otherwise marked, it is
designed to operate from a 110V 50Hz supply. The power cable uses the standard colour code of
Live - Brown; Neutral - Blue; Yellow/Green – Earth
When locating the sampler it is important that the rear of the unit should not be too close to a wall etc.,
which could impede the free flow of cooling air through the Sampler. No other installation procedure is
required.
If the DC/AC converter is to be used, connect the Sampler to the 3-pin socket on the converter. Then
connect the 12V input leads securely to a suitable battery.
NOTE that the operating current is approximately 15A. For example, a fully charged 12V 85Ahr battery will
run the L60iF for about 5 to 5½ hours.
3.2 Preparation for sampling
3.2.1 Selection of test routine (Refer to flow charts at rear of manual)
The Sampler will be in Operator mode, if switched on with no buttons pressed.
In operator mode, selecting Run test will display the routine set up in Supervisory mode. Selecting confirm
will run this test. Unless cancelled, the test will then run as described on the display. If an alarm condition
causes a test to stop, the results of the test until stoppage can be displayed, and the system can then be
returned to the opening menu by pressing end.
To change the type of test, Supervisory mode must be entered as follows. With the instrument switched OFF,
press and hold the Up (n
n
) and Down (
p
) keys and switch the unit ON. The following options will then be
available by scrolling up or down.
Test results
The results of previous tests can be displayed in turn for reference. (The operator can access the
most recent test only, in case the results were not noted, or there was a power failure when the
operator was not present.). Each result is displayed with a code to indicate how the sample ended.
Where a sample has several parts as a result of power failures the separate parts can be viewed
labelled PF and a summary result is also displayed labelled FI.
A sample stored in a single uninterrupted run is labelled OK.
L60iF Issue 9 November 2018 5
Low and high flow alarms
If for any reason, the flow drops to a very low level, or rises to an abnormally high level it is desirable
that the test should be aborted.
Low flow
Apart from mischievous blocking of the air inlet, the most likely cause of low flow will be excessive
loading of the filter following an event that releases large clouds of dust or particles.
The supervisor can select an alarm level a few litre/minute below the working flow for the filter in
use. For example, if the flow is normally 64 l/min when the pump is hot, a low flow alarm limit of 60
l/min could be set. The limit can be set down to 20 l/min, if required.
The results of the test up to the time at which the alarm condition occurs will be stored and the code
LF appended.
High flow
The high alarm level is not set as an absolute value, because of wide range of flows likely to be
encountered in normal operation. For example, the cold airflow may be 5 l/min more than the hot
flow, and the flow will also be lower with a high restriction filter.
The high alarm level is set as the change of flow (increase) that must occur within a 2 second period
during sampling to trigger the alarm. Thus the change always ‘rides’ on the present flow setting. If
for example, the alarm level is set to 5 l/min and the cold flow is 69 l/min, the alarm level will be 74
l/min. If the airflow drops to 65 l/min for any reason, the alarm level will likewise drop to 70 l/min.
Apart from damage to the filter, the most likely cause of a high flow alarm is an extension hose
being accidentally detached from the front of the sampler. The results of the test up to the time at
which the alarm condition occurs will be stored and the code HF appended.
If a limit less than 1 l/min is attempted, the high alarm will be disabled.
Alarm Sounder
The audible alarm that sounds when a flow failure is recorded can be muted.
L60iF Issue 9 November 2018 6
Volume Display
Volume up to 99.999 m³ can be displayed in litres by setting the volume display to Auto. The
alternative is a display in m³ at all times.
Auto Restart
The supervisor can select what happens if power is interrupted. The test can stop at that point or
resume when power is restored and complete as programmed. The supervisor can select the number
of restarts allowed in a particular test (up to 50) and the maximum duration of a power failure (up to
100 hours).
Real time & date
These parameters will rarely need to be accessed, unless for example, GMT changes to BST or vice
versa.
Test mode
Five operating modes are available, and once a mode is selected it will be the test that will run
whenever the operator selects Run test.
1. Timed test
This will start as soon as the operator confirms that a test is to be run. It will continue until the
selected test duration (e.g. 10 minutes) has elapsed.
2. Volume test
This will start as soon as the operator confirms that a test is to be run. It will continue until the
selected volume of air (e.g. 600 litres) has been sampled.
3. Delayed timed test
This mode will be entered as soon as the operator selects Run test. The start time and test duration
will be displayed until the operator selects confirm. The display will then change to Real time and
start time. Sampling will not commence until the preset start time, and will continue for the preset
duration unless a low flow alarm condition occurs.
4. Delayed volume test
This mode will be entered as soon as the operator selects Run test. The start time and volume to be
sampled will be displayed until the operator selects confirm. The display will then change to Real
time and start time.
Sampling will not commence until the preset start time, and will continue until the selected volume
of air has been sampled, unless a low flow alarm condition occurs.
5. Open ended test
This mode will be entered as soon as the operator selects Run test and then confirm to start the
test.
The test will run until stop is selected by the operator. Flow, total volume and elapsed time will be
displayed during the test.
L60iF Issue 9 November 2018 7
3.2.2 Selection of filter medium
This will depend on local requirements. For example, if dust and particulate is to be measured by
weight (gravimetric sample) pre-weighed filters must be available and should be loaded into the
filter holder just before sampling is to start.
If a card mounted or Maypack filter is to be used, the appropriate adapter must be attached to the
air sampler.
All media must be handled carefully to avoid loss of particulate and to maintain traceability. Used
filters should be analysed as soon as possible.
3.2.3 Leaving supervisory mode
To revert to operator mode, switch the sampler off and on again after five seconds.
L60iF Issue 9 November 2018 8
3.3 Taking a sample
3.3.1 At the sampling site, connect the Sampler to power and switch on. Check that the display is
illuminated and showing the opening screen (date, time, and two options).
3.3.2 If sampling or a delayed program is to start immediately, fit the chosen filter to the Sampler
and then press Run test. Check that details of the chosen test mode are now displayed, and
if they are correct, press confirm. Depending on the selected mode, sampling may start, or a
countdown to the delayed start time will begin.
3.3.3 If a test finishes while the sampler is unattended or if an alarm condition occurs, sampling will
be stopped and the results of the test (litres sampled) will be stored with the appropriate error code.
If the ALARM message is displayed, the reason for the stoppage should be investigated before
another test is attempted.
3.3.4 If the filter is undamaged at the end of sampling, it should be removed carefully and returned
to the container from which it was taken at the start of testing. Record any information required by
local rules (weather conditions, date, volume of air sampled etc.).
3.3.5 The filter holder should be cleaned before re-use.
3.3.6 To stop a Volume or Timed test (overriding the auto resume function), turn power off then on
again with p
p
and
o
keys pressed. Sample will not resume.
Alarm Codes
Results will be appended by one of the following codes.
OK – Sample completed in a single run without interruption
FI – Summary result showing programmed start time. Sample ended normally
PF – Sample ended by power failure (one or more parts of test)
If a single run is ended by a power failure that exceeds the interrupt time limit then no FI data is
shown, just a single PF data entry.
LF – Sample ended by low flow alarm (will not resume)
HF – Sample ended by high flow alarm (will not resume)
TL – sample time reached 10,000 hours. Sample ended.
OV – sample volume reached 10,000 m³. Sample ended
Table des matières
Manuels Instrument de mesure populaires d'autres marques
Endress+Hauser
Endress+Hauser Proline Promag 50 Caractéristiques techniques
Siemens
Siemens SITRANS F Coriolis FCT030 Manuel de la liste des pièces
KLINGER
KLINGER CMF V Series Manuel utilisateur
EXFO
EXFO FTB-2 Manuel d'exploitation et d'entretien
Keysight
Keysight M8290A Manuel utilisateur
ADTEK
ADTEK MW-5 Manuel utilisateur