MICHELL Instruments MDM300 Advanced Dew-Point Hygrometer Instruction Manual

MDM300
Advanced Dew-Point Hygrometer
Sensor & Battery Replacement Manual

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MDM300
For Michell Instruments’ contact information please go to www.michell.com

© 2013 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.

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 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 qualified 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 with such gases. DO NOT permit pressures greater than the safe working pressure to be applied to the instrument. The specified safe working pressure (SWP), for this instrument, is 350 bar (5000 psi).

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 office’s 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 fitted, 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.

Abbreviations

The following abbreviations are used in this manual:

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.

MAINTENANCE

The MDM300 requires very little maintenance. The only user-replaceable parts are the battery, the internal sensor, and the top hat filter located behind the inlet orifice fitting. The following sections detail the routine and corrective maintenance procedures.
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.
Replacement of Sensor and Battery Pack
To gain access to the internal sensor and the battery housing, proceed as follows (refer to Figure 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 firm 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 five cap screws (1) and washers (2) (see Figure 1).

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 teased apart.
   There should also be an O-ring (see Figure 2, (4)) on each of the five pillars – keep these safe for later use.

6. Place the two halves of the casing (1) and (2) side by side (refer to Figure 2).
   Item (3) shows the battery retaining clamp.

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 five 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.

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. NOTE: In Figure 3 the battery pack has been removed so the sensor can be seen more clearly – it is not necessary to remove the battery pack at this time.

2. Remove the connectors, (9), (10) and (11) 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 (7) securing the sensor to the gas inlet and outlet ports. NOTE: Make a note of the orientation of the sensor in relation to the gas connections. Ensure that it is re-installed in the same orientation.

4. Lift the sensor (8) clear.

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 (7) fingers tight.
3. Tighten each union an additional ¾ of a turn.
4. Re-fit the connectors (9), (10), and (11). 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.

Battery Removal and Replacement
Battery removal
To remove the battery, proceed as follows:

1. Open the instrument case as described in Section 1.2.1.
2. Loosen the battery clamp retaining screws (4) and lift the battery clamp (3) clear as shown in Figure 4.
3. Release the clip on top of the polarized battery connector (6), on the main MDM PCB.
4. Lift the battery (5) clear.

Battery replacement
To replace the battery, proceed as follows:

1. Fit the battery connector socket section (6) back into the plug section on the PCB, push the two halves of the connector together and ensure that they lock together.
2. Place the replacement battery (5) in the position shown in Figure 4.
3. Re-fit the battery clamp (3) and tighten both fixing screws (4).
4. Close the casing as described in Section 1.2.2.
5. Switch on the instrument and check that it is operating satisfactorily.
6. Charge the battery, when necessary, as described in the User’s Manual.

Appendix A Quality, Recycling & Warranty Information

Appendix A Quality, Recycling & Warranty Information

A.1 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 that 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.

WEEE And RoHS Compliance
The Waste Electronic and Electrical Equipment (WEEE) Directive, and the Restriction of Hazardous Substances (RoHS) Directive place 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 products are currently exempt from the RoHS directive, however, all future products will be developed entirely using compliant materials. Furthermore, Michell is taking active steps to remove non-compliant materials and components from existing products wherever possible.
Michell is in full compliance with the WEEE Directive (Registration No. WEE/JB0235YW).
Customers may be required to return certain instruments for treatment at the end of their working life. June 2010

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 final 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.

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 certificates for instruments and sensors are not issued under our UKAS accreditation. UKAS certificates are usually to special order and are clearly identified.

Return Policy
If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be completed:
Notify a Michell Instruments distributor, giving full details of the problem, the model variant, and the serial number of the product.
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.
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.

Warranty
Unless otherwise agreed, the Supplier warrants that 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 are undertaken shall be performed using reasonable skill and care, and 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.

http://www.michell.com

References

• Michell Instruments, Dew Point, Humidity and Oxygen Specialists
• Quality, Recycling, Compliance & Warranty Information - Michell Instruments
• Michell Instruments UK
• Michell Instruments UK

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