Parr Instrument 6200 - Manual (Page 41)

42
6200
Calorimeter Operating Instruction Manual
The replacement of protective
fuses for the 6200 Calorimeter should
be performed by qualified personnel.
All fuses except Parr part # 139E23 are
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.
Note: Check the labels on the instrument
for correct fuse rating.
Parr
Part # Description Type Ratings
139E23 Lines
Protective
Fuses
Fast-
Acting 15 Amps,
250Vac
1641E2 Heater Fuse
(F2)
Fast-
Acting 2.5
Amps,
250Vac
1641E Pump Fuse
(F1) Fast-
Acting 1 Amp,
250VAC
The calorimeter will run a
number of diagnostic checks
upon itself and will advise the operator if it
detects any error conditions. Most of these
errors and reports will be self-explanatory. The
following list contains errors that are not
necessarily self-evident and suggestions for
correcting the error condition.
A Misfire Condition Has Been Detected This
error will be generated in the event the total
temperature rise fails to exceed 0.5 C after
the first minute of the post-period.
A Preperiod Timeout Has Occurred. The
calorimeter has failed to establish an
acceptable initial temperature, prior to firing the
bomb, within the time allowed. Possible causes
for this error are listed below:
•
A bomb leak.
• Poor bucket stirring.
• Metal to metal contact between the bucket
and the jacket.
•
Lid not tight or foam seal has deteriorated.
• Bucket temperature outside the acceptable
range (3-5 deg C below the jacket setpoint).
•
Jacket requires water
The Current Run Has Aborted Due To
Timeout. The calorimeter has failed to
establish an acceptable final temperature
within the time allowed. Possible causes for
this error are listed below:
•
Poor jacket water circulation due to a
kinked hose or insufficient water in the tank.
•
A bomb leak.
• Poor bucket stirring.
There Is A Problem With The Bucket
Thermistor. Possible electrical open.
•
Check connection to board.
• Check quick disconnect.
• Replace probe.
There Is A Problem With The Jacket
Thermistor. Possible electrical open or short.
These errors will result if the temperature probe
response is not within the expected range.
Probe substitution can be useful in determining
the cause of the problem (probe or electronics).
The valid working range of the probe resistance
is 1000 to 5000 ohms
9
9-2
6200 Calorimeter
Error List
Fuses