Michell Instruments MDM300 I.S. User manual

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
qualied 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 specied 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 oces 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
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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 orice
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
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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
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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 oces
contact information.
2
3
1
Figure 4 Battery Replacement

MDM300 I.S. Sensor & Battery Replacement Manual
Michell Instruments 5
APPENDIX A
Appendix A
Quality, Recycling
& Warranty
Information

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APPENDIX A
Appendix A Quality, Recycling & Warranty Information
A.1 Pressure Equipment Directive (PED) 97/23/EC
The above Directive has been implemented in United Kingdom Law by the Pressure Equipment
Regulations 1999.
The Regulations require that all pressure equipment and assemblies within the scope of the Pressure
Equipment Directive must be safe when placed on the market or put into service.
Michell Instruments’ products have been assessed and, as referenced against the Classication Charts
detailed in Annex II of the Directive, do not fall into the requirements for CE marking compliance
with the Pressure Equipment Directive.
Article 3, paragraph 3 states that any product containing a pressurized uid that does not qualify for
compliance should, nevertheless, be constructed with Sound Engineering Practice (SEP).
Michell Instruments attests here that its products have been designed, manufactured & tested to
assure safe operation, and in accordance with Sound Engineering Practices.
A.2 Recycling Policy
Michell Instruments is concerned with the protection of the environment. It is our commitment to
reduce and eliminate from our operations, wherever possible, the use of substances which may be
harmful to the environment. Similarly, we are increasingly using recyclable and/or recycled material
in our business and products wherever it is practical to do so.
To protect natural resources and to promote material reuse, please separate batteries from other
types of waste and recycle responsibly. If batteries are not properly disposed of, these substances
can cause harm to human health and the environment
The product that you have purchased may contain recyclable and/or recycled parts and we will be
happy to provide you with information on these components if required. For further information
please see the following sections.
A.3 WEEE Compliance
Directive 2012/19/EU 4 July 2012 on Waste Electronic and Electrical Equipment (WEEE)
The Waste Electronic and Electrical Equipment (WEEE) Directive places rules upon European
manufacturers of electrical and electronic equipment. The directives’ aim is to reduce the impact
that electronic devices have on the environment.
Michell Instruments is in full compliance with the WEEE Directive and is registered with an approved
recycler (Registration No. WEE/JB0235YW) and treats the requirement of the directive and the
protection of the environment with the utmost importance. All Michell Instruments’ products are
appropriately marked indicating their requirement for recycling.
It may be required to return certain instruments for treatment at the end of their working life.
Feb 2013

MDM300 I.S. Sensor & Battery Replacement Manual
Michell Instruments 7
APPENDIX A
A.4 RoHS2 Compliance
Directive 2011/65/EU of the European Parliament and of the Council of 8 June 2011
The Restriction of Hazardous Substances (RoHS) Directive places rules upon European manufacturers
of electrical and electronic equipment. The directives’ aim is to reduce the impact that electronic
devices have on the environment.
According to the EC Directive 2002/95/EC, Michell Instruments’ products qualify as Category 9,
Control and Monitoring Equipment. Under the 2002/95/EC Directive, Category 9 products are exempt
from compliance with the Directive.
However, the careful design of all Michell Instruments’ products takes into consideration the
requirements of the Directive and, wherever possible, compliance is achieved. All future products
will be developed entirely using compliant materials. Furthermore, Michell Instruments is taking
active steps to remove non-compliant materials and components from existing products wherever
these may occur. Presently, none of the non-compliant materials are known to occur in Michell
Instruments’ products.
The new Directive 2011/65/EU (RoHS2) entered into force on 21 July 2011 and required all Member
States to transpose the provisions into their respective national laws by 2 January 2013.
Under the provisions of the RoHS2 EU Directive 2011/65/EU (Article 3, [24]) denes ‘Control and
Monitoring Equipment’ specically as ‘monitoring and control instruments designed exclusively for
industrial or professional use’.
RoHS2 EU Directive 2011/65/EU states the closing date for compliance of any Control and Monitoring
Equipment product sold into the EU market place as 22nd July 2017.
However, the careful design policy of all Michell Instruments’ products continues to attain compliance
in the shortest practical timescales and strives to ensure that less than 0.1% of total mass per
product, of all non-compliant materials, appear within them. Michell Instruments continues to
monitor suppliers and material sources to ensure that compliance of goods provided is maintained.
January 2013
A.5 Warranty
Unless otherwise agreed, the Supplier warrants that, as from the date of delivery for a period of 12
months, the goods and all their component parts, where applicable, are free from any defects in
design, workmanship, construction or materials.
The Supplier warrants that the services undertaken shall be performed using reasonable skill and
care, and be of a quality conforming to generally accepted industry standards and practices.
Except as expressly stated, all warranties whether express or implied, by operation of law or
otherwise, are hereby excluded in relation to the goods and services to be provided by the Supplier.
All warranty services are provided on a return to base basis. Any transportation costs for the return
of a warranty claim shall reside with the Customer.

MDM300 I.S. Sensor & Battery Replacement Manual
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APPENDIX A
A.6 REACH Compliance
Regulation (EC) No. 1907/2006
Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH)
Michell Instruments is a manufacturer of moisture measurement and gas analysis instrumentation
and is a ‘downstream’ user of chemicals, as described by the EU Council Directive 76/769/EEC. The
products we supply are not raw chemical products (goods).
Under normal and reasonably foreseeable circumstances of application, the goods supplied to you
shall not contain or release any prohibited chemicals. No listed SVHC (Substances of Very High
Concern) appear within products manufactured by Michell Instruments. Therefore the 0.1% mass
per product, or total usage of 1 tonne/year, will never be exceeded. For these reasons we are neither
required by obligation for registration nor for the creation of material safety data sheets (MSDS) for
our products.
Our continued review of the SVHC Candidate List and latest additions is to ensure we remain
compliant.
Michell Instruments maintains a hazardous material register in which MSDS data sheets are collated,
and we will check that our suppliers will comply to REACH requirements for all materials and
substances we use in the processes of our manufacturing.
In the unlikely event that any chemicals of concern appear in our products in quantities greater than
0.1% of total mass per product we will immediately inform you by correspondence according to the
REACH Article 33 requirements. Our current appraisal is, however, that we do not expect or foresee
such an incidence.
January 2013
A.7 Calibration Facilities
Michell Instruments’ calibration facilities are among the most sophisticated in the world and have
been recognized for their excellence.
Traceability to the National Physical Laboratory (NPL) UK is achieved through our UKAS Accreditation
(Number 0179). This covers dew point over the range -90 to +90°C (-130 to +194°F) and also
Relative Humidity.
Dew-point calibrations are also traceable to the National Institute for Standards & Technology (NIST)
USA over the range -75 to +20°C (-103 to +68°F).
NOTE: Standard traceable calibration certicates for instruments and sensors are not
issued under our UKAS accreditation. UKAS certicates are usually to special order and
are clearly identied.

MDM300 I.S. Sensor & Battery Replacement Manual
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APPENDIX A
A.8 Return Policy
If a Michell Instruments’ product malfunctions within the warranty period, the following procedure
must be completed:
1. Notify a Michell Instruments’ distributor, giving full details of the problem, the
model variant and the serial number of the product.
2. If the nature of the problem indicates the need for factory service then the
instrument should be returned to Michell Instruments, carriage prepaid, preferably
in the original packaging, with a full description of the fault and the customer
contact information.
3. Upon receipt, Michell Instruments will evaluate the product to determine the cause
of the malfunction. Then, one of the following courses of action will be taken:
• If the fault is covered under the terms of the warranty, the instrument will
be repaired at no cost to the owner and returned.
• If Michell Instruments determines that the fault is not covered under the
terms of the warranty, or if the warranty has expired, an estimate for the
cost of the repairs, at standard rates, will be provided. Upon receipt of the
owner’s approval to proceed, the product will be repaired and returned.
A.9 Manufacturing Quality
Michell Instruments is registered with the British Standards Institute for Quality Assurance to:
BS EN ISO 9001: 2008
Rigorous procedures are performed at every stage of production to ensure that the materials of
construction, manufacturing, calibration and nal test procedures meet the requirements laid down
by our BSI approved Quality System.
Please contact Michell Instruments (www.michell.com) if the product does not arrive in perfect
working order.

MDM300 I.S. Sensor & Battery Replacement Manual
10 97469 Issue 1, October 2014
APPENDIX B
Appendix B
Return Document &
Decontamination Declaration

MDM300 I.S. Sensor & Battery Replacement Manual
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APPENDIX B
Appendix B Return Document & Decontamination Declaration

MDM300 I.S. Sensor & Battery Replacement Manual
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NOTES:

MDM300 I.S. Sensor & Battery Replacement Manual
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NOTES:

http://www.michell.com