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ADDENDUM TO OS550/OS550-BB MANUAL
IMPORTANT CONSIDERATIONS BEFORE INSTALLATION
Follow all safety precautions and operating instructions outlined in this
addendum and your OS550 Series manual.
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CAUTION: Refer to accompanying documents. Ref. ISO 3864 NO. B.3.1
DIRECT CURRENT ONLY: REF. IEC 417, NO. 5031
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Section 3.2 How to Power the Thermometer
• Only experienced personnel should install and make electrical connections to
the thermometer.
• Power must be disconnected before making any electrical connections.
• The power supply used to power the thermometer should be VDE or
UL approved with the following ratings: Power: 7-24 Vdc @ 80 mA. Overload
Protection: Current limited to 500 mA.
• There is only one fuse in the OS550. Disconnect power before replacing the fuse.
The fuse must be replaced with one of identical size and rating. Fuse
Specifications: 125 mA/250 Vac, Time-lag, 5 x 20 mm with UL and/or VDE
Approvals such as Wickmann No. 19195-028.
• All connections made to the thermometer should be made via a
stranded wire, shielded cable, 24 AWG (min), such as OMEGA Engineering’s
Model TX4 or TX8 series. Wiring requirements for this unit are Class II.
• Do not operate in flammable or explosive environments.
• This product is for professional use only. It is intended for use exclusively in
laboratory or factory settings. Do not use it outdoors. Do not operate in
flammable or explosive environments. There are no user serviceable parts inside
this unit.
ADDENDUM