YSI 5239 User Manual
YSI Model 5239
Dissolved
Oxygen Probe
Instruction
Manual
NTRODUCTION
I
Table of Contents
........................................................................ 1
P
ROBE CONFIGURATION
S
YSTEM SPECIFICATIONS
T
EMPERATURE COMPENSATION
ROBE OPERATION
P
M
EMBRANE INSTALLATION
C
ALIBRATION
E
RRONEOUS READINGS
I
NTERFERENCES
A
S
RINCIPLES OF OPERATION
P
T
T
T
................................................................................... 6
CIDS
TORAGE
HE CLARK OXYGEN SENSOR
HE
HE FORMATION OF
.............................................................................. 6
DO R
EADINGS FROM THE CATHODE REDUCTION
................................................................. 2
....................................................................... 3
................................................................... 6
AgCl
....................................................... 1
...................................................... 1
........................................... 2
.................................................. 2
........................................................ 5
................................................... 7
.............................................. 7
......... 8
AT THE ANODE
............................ 8
T
HE FUNCTION OF THE ELECTROLYTE
AINTENANCE AND TROUBLESHOOTING
M
M
EMBRANE CAP LIFE
E
LECTRODE CLEANING
T
ROUBLE SHOOTING GUIDE
S
ERVICING
......................................................................... 13
........................................................ 10
...................................................... 11
............................................... 12
i
.................................. 9
............................ 10
ARRANTY AND REPAIR
W
...................................................... 14
C
LEANING INSTRUCTIONS
P
ACKING INSTRUCTIONS
.................................................. 16
..................................................... 17
ii
NTRODUCTION
I
The YSI Model 5239 probe is used for measuring dissolved
oxygen in the field. It is the first field probe that features cap
membranes for easy membrane replacement (YSI 5906
membrane caps). The probe is rugged, with the DO and
temperature sensors enclosed in a heavy duty probe guard. A
10, 25 or 50 foot cable is directly connected to the probe body
making it waterproof. A 5-pin MS connector at the end of the
cable makes the 5239 fully compatible with all YSI 50 series
DO meters retaining the accuracy of the system. The 5239 has
been optimized for YSI meters which have a micro-processor
for sampling and processing data, such as YSI Models 50B
and 52. The system specifications, when used with a YSI 50
Series DO meter, are as follows:
P
ROBE CONFIGURATION
• Cathode: Gold
• Anode: Silver
• Membrane: FEP Teflon
• Electrolyte: YSI standard probe solution (Half
saturated KCl)
• Polarizing voltage: -0.8 V vs. the potential of the Ag
anode/reference electrode
S
YSTEM SPECIFICATIONS
• Temperature range: -5° to 45° C
• Temperature accuracy: ±0.2° C
• Temperature response time: 30 sec for 95% of change.
1
• DO range: 0 to 200 % air saturation or 0 to 20 mg/L.
• DO accuracy: ±2 % or ±0.2 mg/L whichever is greater.
• DO response time: 30 sec for 95% of change at 25°C.
T
EMPERATURE COMPENSATION
Temperature compensation of DO readings is provided by the
YSI DO meter. For best results, calibrate within ±5° C of the
sample temperature.
ROBE OPERATION
P
NOTE: The 5239 probe is shipped dry. A shipping membrane
was installed to protect the electrodes.
A new membrane cap
must be installed before first use.
M
EMBRANE INSTALLATION
Follow the steps below to install a membrane cap:
1. Unscrew and remove the probe guard. See Figure 1.
2. Unscrew the old membrane cap and remove it from the
probe.
3. Thoroughly rinse the entire area of the silver anode,
gold cathode and threads with clean water (distilled or
deionized) to remove any dry crystals of the old
electrolyte.
4. Hold the membrane cap and fill it with 6 to 7 drops of
YSI standard electrolyte (KCl probe solution)
provided.
2
5. Tap the bottom of the membrane cap with your finger a
few times (don’t touch the membrane) to shake loose
any trapped air bubbles.
6. Screw the membrane cap onto the probe moderately
tight. A small amount of electrolyte should overflow.
7. Rinse off the excess electrolyte with clean water.
8. Screw the probe guard onto the probe body.
9. Place the probe in the calibration bottle provided.
Verify that sponge in the bottle is wet.
Fill membrane cap
with 6-7 drops of
KCl solution.
Unscrew guard
Unscrew cap
Screw cap on
moderately tight
Screw guard on
moderately tight
Tap cap with finger
to remove bubbles.
Figure 1
C
ALIBRATION
Dissolved oxygen calibration must be done in an environment
with a known oxygen content. Three such environments will
be discussed here: calibration in air (water-saturated),
calibration in air-saturated water and calibration by Winkler
3
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