54 3600 Analyzer for O
2
Measurement—Operator’s Manual
3600O2.OM.E9903
2.1.8.1 Battery Replacement (portable instrument)
Your portable instrument may give a “LOW BATTERY” message during
measurement, indicating a need to recharge the batteries. If these batteries do not,
after fully charged, maintain their 16-hour autonomy, they must be replaced.
With the rear panel and orange case set aside, the sealed battery pack that is held
in place by two plastic ties can be removed by cutting the ties, and then removing
the two-wire connection at position J10 on the mother board.
The new battery supplies a connection for position J10. Secure the battery pack
itself to the aluminum panel, as before, with new plastic ties. Carefully replace the
orange case and rear panel, and re-tighten the Allen head screws. You should leave
the instrument plugged in overnight to fully charge the new batteries before
making measurements.
The battery is type G-1600CS nickel-cadmium, 1.6 A/hr, 5 x 1.2 V cells.
Replacement part: Orbisphere model number 32750.
2.1.8.2 Analog Current to Voltage Output Conversion
Some users may find it necessary to change the mA current output to a 0–5 volt
output (or vice versa). This requires that you remove the rear panel and orange
case as explained above, to expose the electronics inside.
The printed circuit board closest to the rear panel, number 1121 for model 3600
instruments or number 1064 for model 3600M instruments, contains the jumpers
you will need to switch. To remove this board, remove the screws on either side
that holds the board in place, and carefully lift it out.
Oriented so the board’s electronic connectors are “down”, you can locate
positions J2, J4, J6, and J8 by looking for the two red-colored jumpers in the
center of the board. To convert the output from 4–20 mA (or 0–20 mA) current
output, move the jumpers in all of these positions as follows:
Jumper position, standard
current output (left) and
voltage output (right), at
positions J2, J4, J6, and J8
Replace the board by placing it back into position and gently pushing it a final
2 mm to make the electrical connection; then reattach the two holding screws.
2.1.8.3 Internal Fuse Replacement
For panel/rack mount and portable instruments: follow the instructions in section
2.1.8 above to remove the rear panel. You will see a power supply card attached to
the inside of the panel. At position F1 is a black plastic fuse holder. Remove the
fuse cover using a thin coin to push down and turn.
For wall mount instruments: the power supply card is located on the rear panel of
the instrument casing.
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