Michell Instruments MDM300 I.S. Manuale utente
MDM300 I.S.
Advanced Dew-Point Hygrometer
Sensor & Battery Replacement Manual
- I.S.
97469 Issue 1
October 2014
Please ll out the form(s) below for each instrument that has been purchased.
Use this information when contacting Michell Instruments for service purposes.
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© 2014 Michell Instruments
This document is the property of Michell Instruments Ltd. and may not be copied or
otherwise reproduced, communicated in any way to third parties, nor stored in any Data
Processing System without the express written authorization of Michell Instruments Ltd.
- I.S.
For Michell Instruments' contact information please go to
www.michell.com
MDM300 I.S.
MDM300 I.S. Sensor & Battery Replacement Manual
iv 97469 Issue 1, October 2014
Contents
Safety ................................................................................................................................ v
Electrical Safety ........................................................................................................... v
Pressure Safety ............................................................................................................ v
Toxic Materials ............................................................................................................. v
Repair and Maintenance ............................................................................................... v
Calibration ................................................................................................................... v
Safety Conformity ........................................................................................................ v
Abbreviations ......................................................................................................................vi
Warnings ............................................................................................................................vi
1 MAINTENANCE ..................................................................................................1
1.1 Routine Maintenance .......................................................................................... 1
1.2 Replacement of Sensor and Battery Pack .............................................................. 1
1.2.1 Open Casing ................................................................................................. 1
1.2.2 Close Casing ................................................................................................. 2
1.2.3 Internal Sensor Removal and Replacement ..................................................... 3
1.2.4 Battery Replacement ..................................................................................... 4
Figures
Figure 1 Remove Case-Securing Bolts .......................................................................1
Figure 2 Open Case .................................................................................................2
Figure 3 Internal Sensor Removal .............................................................................3
Figure 4 Battery Replacement ..................................................................................4
Appendices
Appendix A Quality, Recycling & Warranty Information .....................................................6
A.1 Pressure Equipment Directive (PED) 97/23/EC .................................6
A.2 Recycling Policy ............................................................................6
A.3 WEEE Compliance ..........................................................................6
A.4 RoHS2 Compliance ........................................................................7
A.5 Warranty .......................................................................................7
A.6 REACH Compliance ........................................................................8
A.7 Calibration Facilities .......................................................................8
A.8 Return Policy .................................................................................9
A.9 Manufacturing Quality ....................................................................9
Appendix B Return Document & Decontamination Declaration ........................................ 11
MDM300 I.S. Sensor & Battery Replacement Manual
Michell Instruments v
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. The user must not use this equipment for any other purpose than that
stated. Do not apply values greater than the maximum value stated.
This manual contains operating and safety instructions, which must be followed to ensure the safe
operation and to maintain the equipment in a safe condition. The safety instructions are either
warnings or cautions issued to protect the user and the equipment from injury or damage. Use
qualied personnel and good engineering practice for all procedures in this manual.
Electrical Safety
The instrument is designed to be completely safe when used with options and accessories supplied by
the manufacturer for use with the instrument. The instrument is powered by an internally mounted
rechargeable battery. The input power supply voltage limits for the battery charger supplied with the
instrument are 100 to 240 V AC, 47/63Hz.
Caution: No other battery charger unit, other than that supplied with the instrument
should be used.
Pressure Safety
High pressure gases can be extremely dangerous and only trained personnel should attempt to
connect and use the MDM300 I.S. with such gases. DO NOT permit pressures greater than the safe
working pressure to be applied to the instrument. The specied safe working pressure (SWP), for
this instrument is 350 barg (5000 psig).
Toxic Materials
The use of hazardous materials in the construction of this instrument has been minimized. During
normal operation it is not possible for the user to come into contact with any hazardous substance
which might be employed in the construction of the instrument. Care should, however, be exercised
during maintenance and the disposal of certain parts.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. Refer
to www.michell.com for details of Michell Instruments’ worldwide oces contact information.
Calibration
The recommended calibration interval for this instrument is 12 months. The instrument should be
returned to the manufacturer, Michell Instruments Ltd., or one of their accredited service agents for
re-calibration. Alternatively a freshly calibrated exchange sensor can be purchased and easily tted,
see Section 1.2.3.
Safety Conformity
This product carries the CE mark and meets the requirements of all the relevant European and U.S.
safety directives.
MDM300 I.S. Sensor & Battery Replacement Manual
vi 97469 Issue 1, October 2014
Abbreviations
The following abbreviations are used in this manual:
AC alternating current
bar pressure unit (=100 kP or 0.987 atm) (gauge)
Hz Hertz
psig pound(s) per square inch (gauge)
V Volts
Warnings
The following general warnings listed below are applicable to this instrument. They are
repeated in the text in the appropriate locations.
!
Where this hazard warning symbol appears in the following
sections, it is used to indicate areas where potentially hazardous
operations need to be carried out.
MDM300 I.S. Sensor & Battery Replacement Manual
Michell Instruments 1
MAINTENANCE
1 MAINTENANCE
The MDM300 I.S. requires very little maintenance. The only user-replaceable parts are
the battery, the internal sensor and the top hat lter located behind the inlet orice
tting. The following sections detail the routine and corrective maintenance procedures.
1.1 Routine Maintenance
The only routine maintenance required is to periodically clean the casing, display and keyboard
of the instrument with a damp cloth and a mild detergent. The required frequency of cleaning
will depend upon instrument usage and whether or not it is used in a carrying case.
!
Do not use acetone or any other type of solvent as this could
damage the casing, display and keyboard.
1.2 Replacement of Sensor and Battery Pack
To gain access to the internal sensor and the battery housing, proceed as follows (refer
to
Figure 1)
.
1.2.1 Open Casing
!
When the casing is open, the circuit board, which contains
electrostatically sensitive devices, is exposed.
Take appropriate precautions i.e. wear an earthing wristband, in
order to prevent possible damage.
To open the casing, proceed as follows:
1. Switch the instrument OFF.
2. Disconnect any connections to the gas ports.
3. Place a sheet of card onto a rm surface in order to protect the instrument’s
display and casing from possible scratching and place the instrument face
down.
4. Using an Allen key, sequentially remove the ve cap screws (1) and washers
(2) (see
Figure 1)
.
Fig 5.1_V4_Remove Screws
2
1
Figure 1
Remove Case-Securing Bolts
MDM300 I.S. Sensor & Battery Replacement Manual
297469 Issue 1, October 2014
MAINTENANCE
5. Open the two halves of the casing. NOTE: There is a seal between the
two halves so the top and bottom halves may need to be eased apart.
There should also be an O-ring (see
Figure 2
, (5)) on each of the ve
pillars - keep these safe for later use.
6. Place the two halves of the casing (3) and (4) side by side (refer to
Figure 2)
.
3 4
5
Figure 2
Open Case
1.2.2 Close Casing
To close the casing, proceed as follows:
1. Place the two halves of the casing together, checking that no cables
are trapped between the two halves and that there is an O-ring on
each of the ve pillars.
2. Initially replace each of the cap screws and washers without fully
tightening them.
3. Tighten-up each cap screw. NOTE: Do not overtighten as this could
cause the case to crack.
MDM300 I.S. Sensor & Battery Replacement Manual
Michell Instruments 3
MAINTENANCE
1.2.3 Internal Sensor Removal and Replacement
Sensor removal
To remove the sensor proceed as follows:
1. Open the instrument case as described in Section 1.2.1.
2. Remove the connectors, (3), (4) and (5) from the back of the sensor
(see
Figure 3)
. NOTE: Each connector is locked in position
by a clamp situated at the back of the connector. Before
attempting to pull the connector out, push this clamp away
from the connector in order to release it.
3. Use a spanner to unscrew the locknuts (1) securing the sensor to the
gas inlet and outlet ports.
4. Lift the sensor (2) clear.
2
3
5
4
1
Figure 3
Internal Sensor Removal
Sensor replacement
To replace the sensor, proceed as follows:
1. Place the replacement sensor back into the gas connections, ensuring
that it is re-installed in the same orientation as previously,
and locate the olives in the gas ports.
2. Tighten each of the locknuts (1) nger tight.
3. Tighten each union an additional ¾ of a turn.
4. Re-t the connectors (3), (4) and (5). The connectors are polarized
and cannot be inserted incorrectly. Ensure that the connectors lock
into position.
5. Close the casing as described in Section 1.2.2.
6. Switch on the instrument and check that it is operating satisfactorily.
MDM300 I.S. Sensor & Battery Replacement Manual
497469 Issue 1, October 2014
MAINTENANCE
1.2.4 Battery Replacement
Battery Replacement
To replace the battery, proceed as follows:
1. Open the instrument case as described in Section 1.2.1.
2. Loosen the 3 battery clamp retaining screws (2).
3. Release the battery (1) at connector (3) and remove.
4. Re-connect new battery to connector (3).
5. Replace and tighten battery clamp retaining screws (2).
6. Close the casing as described in Section 1.2.2.
7. Switch on the instrument and check that it is operating satisfactorily.
8. Charge the battery, when necessary, as described in the User’s
Manual.
NOTE: No other parts of the MDM300 I.S. are user-servicable - please contact
your Michell representative if further help is needed.
Refer to www.michell.com for details of Michell Instruments’ worldwide oces
contact information.
2
3
1
Figure 4
Battery Replacement
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