Introduction
Specifications
51970-88
DISSOLVED OXYGEN PROBE
This instruction sheet provides information on the Hach Dissolved
™
Oxygen Probe for use with the sens
ion
The Dissolved Oxyge n Pro be is a Clar k-type amperomet ric se nsor us ed
to measure dissolved oxygen in aqueous solutions. It consists of an
anode/cathode electrode system and potassium chloride-based
electrolyte, separated from the sample by a replaceable oxygenpermeable Teflon membrane. A built-in thermistor provides automatic
temperature compensation when using the sens
Oxygen Meter.
6 Dissolved Oxygen Meter.
ion6 Dissolved
Dissolved Oxygen
Probe
1-meter cable
Warranty 1 year 1 year 1 year
Concentration Range 0 - 20 mg/L or
0 - 200% saturation
Accuracy ± 1.0% Full Scale ± 1.0% Full Scale ± 1.0% Full Scale
Temperature Range 0 - 50 °C 0 - 50 °C 0 - 50 °C
Response Time 99% of full value in
1 minute
Minimum Sample
Flow
Drift < 1%/day < 1%/day < 1%/day
Length 150 mm 150 mm 150 mm
Diameter 12 mm 12 mm 12 mm
Connector 5-pin circular 5-pin circular 5-pin circular
Weight Accessory Optional Optional Included
20 cm/sec 20 cm/sec 20 cm/sec
Dissolved Oxygen
Probe
3-mete r cable
0 - 20 mg/L or
0 - 200% saturation
99% of full value in
1 minute
Dissolved Oxygen
Probe
15-meter cable
0 - 20 mg/L or
0 - 200% saturation
99% of full value in
1 minute
DISSOLVED OXYGEN PROBE, continued
Assembly Instructions
1. Hold the membrane module cap in a vertical position.
2
2. Fill the module c ap about
Electrolyte Filling Solution, Hach Cat. No. 27591-26.
3. Hold the DO probe in a vertical position with the tip down and
gently screw the module cap onto the tip. Electrolyte should leak
out of the threads.
Note: If electrolyte does not leak out of the threads, air may remain inside the
module cap. To ensure accurate results, repeat this procedure using more
filling solution.
Attach the DO probe cable connector to the input connec tor at the top of
the meter. Refer to the sens
Manual for additiona l informatio n.
/3 of the way full wit h Dissolve d Oxygen
ion6 Dissolved Oxygen Meter Instruction
Using the Weight Assembly
The Weight Assembly is included with the probe equipped with the
15 m cable. Install the weight assembly as follows:
1. Remove the cap from the body of the weight.
2. Insert the probe into the body.
3. Slide the cap over the cable and thread the cap onto the body.
The weight will help to ensure that the probe travels straight down after
being placed in the w ate r and a lso p rotects the membr ane fro m da mage.
Zeroing the Probe
Chemically zeroing the probe is only necessary when measuring
dissolved oxygen at a level less than 1 ppm (or 10% saturation). When
measuring in this range, zero the probe prior to calibration. It is only
necessary to zero a probe once.
Refer to the sens
specific instructions.
ion6 Dissolved Oxygen Meter Instruction Manual for
2
DISSOLVED OXYGEN PROBE, continued
General Probe Operation
Follow the procedures presented in this section to obtain maximum
performance and accuracy from your DO probe:
• Use the DO probe only for aqueous applications.
• Take extra care when handling and storing the oxygen membrane
module cap.
• Do not allow the DO probe’s sensing area (cap reservoir) to dry out.
• Perform the calibration procedure at the beginning of each day for
maximum performance. Recalibrate the DO probe every two hours
for maximum accuracy.
The DO probe can be left out of solution for up to 24 hours without
damage. If the DO probe is not being used for more than 24 hours,
prevent electrolyte evaporation by storing it in the storage/calibration
chamber. Refer to the meter instru ction manu al fo r more inf ormati on on
probe storage.
Probe Polarization
Note: Prior to
operation , connect t he
probe to the meter.
Allow the probe to
stabilize for 30-50
minutes before
attempting
a calibration.
Hach dissolved oxygen probes are continuously polarized when they
are connected to the instrument. A steady reading will not be seen for
30–50 minutes when the probe is new or when it has been unplugged
for more than an hour. Interrupted connections of less than one hour
will require 5–25 minutes before stabilizing. Refer to the sens
Dissolved Oxyg en Meter Instruct ion Manual f or additiona l information.
Probe Calibration
Detailed instructions for calibrating the Dissolved Oxygen Probe using
a Water-saturated Air or Winkler Titration method are presented in the
sens
calibration procedure at the begin ning of eac h day for best performance.
Obtain maximum accuracy by recalibrating the probe every two hours.
ion6
ion 6 Dissolved Oxygen Meter Instruction Manual. Perform a
3
Loading...