YSI 5905, 5010 Instruction Manual
YSI 5905/5010
BOD Probe
Instruction
Manual
i
Table of Contents
I
NTRODUCTION
........................................................................ 1
O
PERATING PRINCIPALS
......................................................... 2
U
SING THE
5905/5010 BOD P
ROBE
....................................... 3
C
HANGING MEMBRANE CAPS
- F
IGURE
2 ............................ 3
W
ARM UP
............................................................................ 5
E
LECTRODE CLEANING
- F
IGURE
3....................................... 5
O
PERATING PROCEDURES AND PRECAUTIONS
....................... 7
P
ROBLEM SOLVING
................................................................. 9
T
ROUBLE SHOOTING GUIDE
................................................. 9
S
ERVICING
............................................................................. 11
W
ARRANTY AND REPAIR
...................................................... 13
C
LEANING INSTRUCTIONS
.................................................. 15
P
ACKING INSTRUCTIONS
..................................................... 16
P
ROBE SPECIFICATIONS
........................................................ 18
A
PPENDIX
A........................................................................... 19
A
PPENDIX
B........................................................................... 20
ii
1
I
NTRODUCTION
The YSI Model 5905/5010 BOD (Biochemical Oxygen
Demand) probe is used for measuring dissolved oxygen in all
popular size BOD bottles. This probe features self stirring, an
easily replaced membrane cap, and a refurbishable electrode
system.
The 5905 probe is designed for use with all YSI dissolved
oxygen meters, except for the Model 55 or Model 95. It must
be used with an adapter (5011) in order to be used on the
Model 5000 and 5100.
The 5010 probe is specifically designed for use with the Model
5000 and 5100 only.
This manual also applies to probes 5905-J, 5905-K, 5905-L,
5905-W (Appendix A), and probes 5010-J, 5010-K, 5010-L,
and 5010-W (Appendix A)
IMPORTANT
Intended Use
The 5905/5010 probe is intended for laboratory use, not field
use. It is not waterproof and should never be immersed past
the taper on the stem of the probe.
2
O
PERATING PRINCIPALS
The 5905/5010 BOD probe is a voltammetric (polarographic)
sensor of dissolved oxygen. An oxygen permeable membrane
covers an electrolytic cell consisting of a cathode and an
anode. This membrane acts as a diffusion barrier and an
isolation barrier preventing the fouling of the cathode surface
by impurities in the environment. The cathode is the gold
electrode, and the anode is the silver electrode which
completes the electrolytic cell and acts as a reference
electrode.
Upon entering the cell through the membrane, oxygen is
reduced at an applied potential of -0.8 V referenced to the
silver electrode. The reduction current at the cathode is
directly proportional to the partial pressure of oxygen in liquid
(expressed as %-air saturation) which is also proportional to
the concentration of dissolved oxygen (in mg/L) at a particular
temperature. Thus the same partial pressure of oxygen (%-air
saturation) in liquid gives different concentrations of dissolved
oxygen (mg/L) at different temperatures because of the
different solubilities of oxygen at different temperatures.
3
U
SING THE
5905/5010 BOD P
ROBE
Note: The 5905 must be plugged into a YSI meter and the
stirrer power plug must be plugged into its power adapter. The
5010 must be plugged into a YSI meter only, as it gets its
stirring power from the 5000/5100 instrument.
C
HANGING MEMBRANE CAPS
- F
IGURE
2
Follow these instructions to change membrane caps:
1. Remove the stir paddle from the probe by pulling it straight
out.
2. Unscrew the old membrane cap from the probe. Before
installing a new membrane, clean the probe tip with
deionized water in order to remove any contaminants.
3. Hold the membrane cap and fill it at least ½ full with the
electrolyte solution provided. Screw the membrane cap onto
the probe moderately tight. A small amount of electrolyte
should overflow.
4. Rinse off excess electrolyte from the probe with deionized
water.
5. Reinstall the stir paddle.
New Probe Use
New probes are shipped with a dry membrane cap to protect
the electrodes. A new membrane cap must be installed
before first use.
4
Fill Membrane Cap
with Solution
Unscrew Cap
Remove
Stir Paddle
Screw Cap on
moderately tight
Replace
Stir Paddle
Figure 2 Membrane Installation on the 5905/5010 Probe.
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