Maintenance
Instruction manual 854 ATG Page 37
Clean the displacer when the displacer’s weight differs more then 3 g from the value in item DW, or
recalibrate the force transducer with the test weights (refer to section 5.5).
For replacement of the printed circuit boards, motor block or force transducer (refer to section 5.4.2).
After replacement of force transducer or motor block the force transducer requires re-calibration
(refer to section 5.5).
5.2 Instrument covers
Opening the instrument
T
he joints between each cover and the housing are waterproof IP65. For this purpose the covers of the
servo, drum compartment and terminal compartment are fitted with O-rings (refer to figure 5.1 and 5.2).
Use a metal rod (like a Tommy bar) for opening the covers.
Check the O-rings to assure water and dust protection. Refer to Appendix A for the dimensions of O-rings.
Closing the compartment covers
In order to ensure that the covers open easily, their screw threads have been greased.
Caution
The 854 ATG is an explosion proof instrument with intrinsically safe output/input circuits.
Modification to the instrument may only be carried out by trained personnel which is authorized by
Honeywell Enraf.
Failure to adhere to this will invalidate the approval certificate.
Caution
Keep screw threads free from dirt. Grease them lightly with an acid-free grease before closing
the instrument.
When closing, turn the covers counter-clockwise until the thread clicks into place,
then turn clockwise.
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