Munro L60iF Скачать руководство пользователя страница 14 | Manualshive

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Munro L60iF Скачать руководство пользователя страница 14

L60iF Issue 9 November 2018

12

6.1 Basic re-calibration

Before starting the calibration procedure it is sensible to

check

the calibration against the reference. If no

significant difference is shown then the procedure is unnecessary.

As explained earlier, the minimum requirement for recalibration is a flowmeter of known accuracy and a
means of adjusting the airflow. These items can be obtained separately and are also fitted to the Munro
Instruments Pump Test Stand.

Calibration set up

NOTE If temperature calibration is also being carried out, please refer to paragraph 5.4.2. Note that
temperature calibration compensates for changing pump performance during the warm-up period to
give maximum accuracy

.

6.1.1. A flow gauge with a maximum flow of 100 litre/minute is recommended. Also required is a cone
adapter, which temporarily replaces the normal 60mm filter holder. Unscrew the filter holder and locate the
cone adapter in its place using its locking ring.

6.1.2. Connect the flow gauge to the L60iF via the Restriction Valve (see diagram above). Open the valve to
offer minimum restriction.

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Содержание L60iF

Страница 1: ...rnt 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 Instruction Manual ...

Страница 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 comp...

Страница 3: ...ump 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 usin...

Страница 4: ...cted 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 view...

Страница 5: ...it 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 wit...

Страница 6: ... 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 pre...

Страница 7: ... 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...

Страница 8: ...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...

Страница 9: ... 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 ...

Страница 10: ...ted 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 ...

Страница 11: ...our directional push buttons Software routines configure the display and buttons in either an Operating or a Supervisory mode The memory that stores the chosen routines etc is battery backed the battery having a nominal life of 10 years There is also a Calibration mode which is entered in a similar manner to the Supervisory mode by holding down selected pushbuttons while powering up the unit The u...

Страница 12: ...ally and more regularly if the Sampler is in constant use If servicing is to be carried out locally a course is available from Munro Instruments on Large Volume Air Sampler maintenance and servicing which includes stripping down and re assembly of pumps checking blade dimensions and making performance measurements Regular service checks are recommended as good practice and as preventive maintenanc...

Страница 13: ...or full confidence the calibration would be performed at least three times and readings of the calibrated flow gauge made over the working range of the L60iF If the errors are small and repeatable the calibration can be accepted with confidence Of course small and repeatable would need to be defined For example if the flow at any chosen calibration point was always within r0 2 l min and the differ...

Страница 14: ...ruments Pump Test Stand Calibration set up NOTE If temperature calibration is also being carried out please refer to paragraph 5 4 2 Note that temperature calibration compensates for changing pump performance during the warm up period to give maximum accuracy 6 1 1 A flow gauge with a maximum flow of 100 litre minute is recommended Also required is a cone adapter which temporarily replaces the nor...

Страница 15: ...l then offer the option of a temperature calibration In normal circumstances this should be refused The L60iF will return to operator mode See Section 8 if a temperature calibration is to be carried out 6 1 7 To check the calibration start the pump and adjust the valve for various flows as indicated on the flowmeter Allow a settling time 30 seconds minimum after adjusting the flow and then note th...

Страница 16: ... the restriction valve and reading the flowmeter When the flow is set and then press the right arrow o to start the ten second averaging run 6 2 6 This routine will be repeated for 58 and 63 litres per minute after which the flow calibration procedure will be complete and the pump switched off The display will then offer the option of a temperature calibration which must be accepted The display wi...

Страница 17: ... Set of replacement air filters for cooling fan inlet 7 2 Training Courses Munro Instruments can offer training courses in air sampler maintenance and calibration adapted to your exact needs These can be at our premises or on site and may be of particular interest to users who cannot easily return samplers to Munro Instruments for servicing and re calibration Courses can be at user level including...

Страница 18: ...g screen reading L60iF Diagnostics and the version number is briefly displayed changing to Note that all times dates and other numerical data in this Appendix are typical It is always possible to revert to a previous screen using the n key Press p to display This is a dynamic display seconds should be incrementing in real time Press p to display Press p to display Press p to display First powered ...

Страница 19: ...errors during the period that the pump is warming up usually the first 20 to 30 minutes of running Without compensation short samples e g 10 minutes will be recorded inaccurately In an 8 hour run the error would be negligible even without compensation As indicated on screen pressing key o displays the next data pressing m reverts to the previous data Pressing p at any time prepares the instrument ...

Страница 20: ...that the calculation of flow from ADC and temperature values can be checked By restricting the flow to one of the set points the corresponding ADC value should be indicated An indicated flow rate of 00 0 l min indicates an invalid calibration Press n or p to stop the pump Calibration check Start pump o o Temperature 40 2 C 63 1 l min ADC 254 0 ...

Страница 21: ...ances is At 44 there is no compensation and at say 20 C the compensation is 20 44 7 75 3 litre minute At 13 C the compensation is 13 44 7 75 4 litre minute This is what would be expected since at the beginning of the test when the temperature was 13 C the true Flow Gauge reading was 71 l min and the L60iF internal reading was 74 7l min The small error of 0 3l min is negligible and is caused by the...

Страница 22: ...low gauge itself must be the best available and also have been calibrated by a Test House having traceable standards The temperature calibration uses a highly accurate sensor as the primary temperature reference whose output is accurate to 0 5 C The L60iF assumes that the error in flow reading is linear with temperature an assumption justified by tests The flow indication is 0 5 litre minute over ...

Страница 23: ...wo on each side at the lower edge 3 Remove the case The bottom edge should be eased out to facilitate removal 4 Identify the circuit board and the Eprom mounted on it position labelled IC6 Drawing 9001 711 is available illustrating this layout 5 The old Eprom carries a label which shows information as follows L60iF Ver 1 02 0000 372D These are the version number and checksum 6 Remove this Eprom wi...

Страница 24: ...ts Test finished Sample 2000 litre Volume 2000 litre cancel confirm end stored Test ready Test 12 00 for 00 30 10 31 Start 12 00 cancel confirm cancel confirm test starts 12 00 for 2000 l cancel confirm Manual stop 55 6 l m 1024 litre cancel confirm Elapsed 00 18 stop 10 30 Fri 14 04 2000 10 30 Fri 14 04 2000 10 47 Fri 14 04 2000 00 30 hrs 2000 litre FI 00 15 hrs 1000 litre PF 00 15 hrs 1000 litre...

Страница 25: ...tes adjust Save Change Time Set Hours Set Minutes C h a n g e T i m e Current hour 14 03 Current minute 14 03 menu change adjust minutes adjust Save Change Date Set Date Set Month Set Year C h a n g e D a t e Date 14 04 2000 Month 14 04 2000 Year 14 04 2000 menu change adjust month adjust year adjust Save Test Setup Test Type Duration Hours Duration Minutes T e s t S e t u p Timed test Duration ho...

Страница 26: ...int 1 Breakpoint 2 Breakpoint 3 Breakpoint 4 Breakpoint 5 00 0 l min ADC 0003 3 48 0 l min ADC 0182 3 53 0 l min ADC 0203 1 58 0 l min ADC 0225 1 63 0 l min ADC 0254 2 Cold pump temp Cold meas flow Cold true flow Hot pump temp Hot meas flow Hot true flow 14 0 C more 74 7 l min more 71 0 l min more 44 5 C more 66 2 l min more 66 5 l min more Calibration check 01 35 00 ADC 243 4 Start pump 60 3 l mi...

Страница 27: ... 2 53 l min when flow set Recording Taking flow reading Please wait 9 9 sec Third Calibration Point Cal Point 3 58 l min when flow set Recording Taking flow reading Please wait 9 9 sec Fourth Calibration Point Cal Point 4 63 l min when flow set Recording Taking flow reading Please wait 9 9 sec Temperature Cal Temperature Cal req Cold flow rate 70 0 Hot flow rate 65 0 No Yes adjust Save adjust Save...

Страница 28: ...ation parameters to be displayed Diagnostic mode flow chart added Operation of High Alarm modified Scrolling error corrected Issue 5 Calibration diagram and following paragraph amended An inline filter is not now used in calibration This modification record added Issue 6 Amendments reflecting new ownership Issue 7 Auto Resume Higher maximum values Firmware V1 04 Issue 8 Safety warning for fan filt...

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