Parr Instrument 6725 - Manual (Page 60)

6725
Semi-micro Calorimeter Instruction Manual
9-1
MAINTENANCE
Refer to Manual 492M, Operating Instructions for the 1109A Semi-micro Oxygen Bomb
for bomb maintenance information.
CAUTION: Risk of Electrical Shock
Disconnect the electrical power before servicing or replacing any components!
Fuses
The replacement of protective fuses for the 6722 Calorimetric Thermometer should be
performed by qualified personnel.
WARNING:
For continued protection against possible hazard,
replace fuses with same type and rating of fuse.
Main line protective fuses. Rated Fast-Act 15 Amp, 250VAC (Parr number 139E23)
Fuse F1– Mains stirrer output fuse. Rated Fast-Act 1 Amp, 250VAC, time lag, 5 x 20mm
(Parr number 1641E)
This fuse is located on the A1794E I/O board located inside the instrument. To
gain access to the inside, first disconnect the power cord from the rear of the unit.
Remove the two screws at the upper rear of the unit that secure the front cover.
Pry up on the back lip of the cover and carefully hinge it forward. Make sure that
the cables attached to the front portion of the cover do not become stretched or
disconnected. Follow this procedure in reverse order to re-secure the front cover.
There is no routine maintenance recommended for the 6772 Calorimetric Thermometer.