Biosystems MultiPro Reference Manual - page 24
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with the new sensor. For an overview of
the Duo-Tox replacement procedure see
section 5.4.2 below.
The sensors in the MultiPro are located in a
vented compartment at the bottom of the
instrument.
To install a sensor:
1. Turn the MultiPro off.
2. Remove the battery pack as described in
section 5.1. This will automatically
disconnect power from the instrument.
3. Remove the four screws shown and pull
the entire main board assembly free from
the instrument housing.
4. Gently remove the sensor that is to be
replaced.
Note: Sensor channels in the MultiPro are
specific to the type of sensor that
occupies the channel. When replacing
sensors, be sure to replace one sensor
with another of the same type.
5. Gently insert the new sensor into the
appropriate location on the sensor board.
6. Reinstall the main board assembly that
was removed in step three and reinstall
the four screws. The main board should
easily slide back into place. The screw
holes in the black mylar insulator should
align with the corresponding holes in the
housing. The sensor gaskets should be
centered over the corresponding sensor
ports at the bottom of the instrument,
allowing the gas sample to reach the
sensors. Be careful not to over tighten
the screws.
7. Reattach the battery pack and re-tighten
the top center screw.
8. New sensors must be allowed to stabilize
prior to use according to the following
schedule. The detector must be powered
off and a functional battery pack must be
installed for the sensor to stabilize.
Sensor Stabilization
Period
Oxygen (O
2
) 1
hour
LEL none
CO 15
minutes
H
2
S 15
minutes
Note: Steps 9 and 10 assume that the
sensor stabilization period has passed.
9. If an oxygen sensor was replaced,
perform the Fresh Air/Zero calibration as
discussed in section 4.2.
10. If a combustible (LEL) or a toxic sensor
has been replaced, perform both the
Fresh Air/Zero calibration and the Span
calibration as discussed in sections 4.2
and 4.3.
5.4.2 Duo-Tox sensor replacement
Note: These instructions are a
condensed version of the Duo-Tox Sensor
Replacement Instructions that are
shipped out with every new Duo-Tox
sensor (as of 11/2006).
1. Verify that the MultiPro has instrument
firmware version 2.10 or higher.
Upgrade if necessary by downloading
and installing the new firmware from
http://www.biodownloads.com
.
2. Locate the CF value on the Duo-Tox
sensor label
3. Follow steps 1-4 in section 5.4.1 above to
disassemble the instrument and remove
the Duo-Tox sensor, but do not install the
new Duo-Tox sensor.
4. On the back side of the main board at the
upper right corner is a 6-pin connector
that functions as the power conduit from
the battery to the instrument. When the
battery pack is attached to the
instrument, these pins must be aligned
so that the battery can power the
instrument. Reattach the main board
assembly to the battery pack by sliding
these 6 male pins into the corresponding
6 female sockets on the battery pack and
allow the instrument to start up without
the Duo-Tox sensor.
5. Once the instrument has completed the
start up sequence and shows only the O2
and LEL sensors, disconnect the main
board from the battery pack.
6. Gently insert the new Duo-Tox sensor
into the appropriate location on the
sensor board.