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4. Special Conditions for Safe Use
Turning the hand-wheel (or T-bar) anti-clockwise (with pressure on the outlet) should be
refrained on non-venting regulators. Pressure should be reduced in this case by venting
downstream of the regulator, and turning the hand wheel simultaneously anti-clockwise.
5. Hazardous Location Usage
This equipment has not been manufactured specifically for use in potentially explosive
atmospheres and as such an ignition hazard assessment has not been carried out on this
product. If the user should wish to use this product in such an environment where there
may be a potentially explosive atmosphere then it is the responsibility of the user to
conduct an ignition hazard assessment against 99/92/EC.
6. Servicing and Maintenance
With so many variants of the LF-690 available, the following section uses three examples
with the aim of covering most options. The product supplied may vary from these examples.
Should any assistance be required then please do not hesitate to contact the office.
Servicing and maintenance work on the LF-690 regulators should only be performed after
fully reading and understanding the Operating and Servicing Manual. Due to the
compressibility of gases, the operator should not endanger themselves or others by working
on this regulator without prior knowledge of the Health and Safety risks relating to handling
of technical gases. Any uncertainty should be clarified with Pressure Tech before working on
the regulator.
Pressure Tech Ltd recommends the use of the following Lubricants/Adhesives during
servicing:
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Krytox GPL 205 lubricant: For the O-rings.
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Molykote 1000 paste: For the adjusting screw.
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Loctite 638: For the lower spring rest thread.
Prior to commencing service, please ensure that:
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The equipment has been de-pressurised
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The load spring has been de-compressed by turning the adjusting mechanism fully
anti-clockwise
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Applications involving toxic, flammable or corrosive media have been fully purged
To ensure the best possible results from servicing, when re-assembling the regulator and
any assemblies within it, ensure that all areas of the components and the regulator body are
cleaned and free from contaminants which may result in failure of the regulator.
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