Extech Instruments Oyster Series User manual

USER GUIDE
pH/mV/Temperature Meter
Model OYSTER-10
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Introduction
Congratulations on your purchase of Extech's Oyster Series splash-proof meter. This microprocessor-
based device with tactile buttons simultaneously displays pH or mV and Temperature (oC/oF
selectable).
The device can store 25 labeled readings for recall at a later time. The Oyster 10 is battery operated,
portable, and includes a hinged display that can be adjusted to any viewing angle. In addition, the
neck-strap offers hands-free operation.
Advanced features include diagnostic displays, MIN/MAX readings, audible alerts, 5-point buffer
recognition, & Auto/Manual temperature compensation.
This instrument is shipped fully tested and calibrated and, with proper use, will provide years of reliable
service. Please visit the Extech Instruments website (www.extech.com) to check for the latest version
of this User Guide. Extech Instruments is an ISO-9001 certified company.
Meter Description
1. LCD Display
2. Battery compartment (9V battery)
3. Function buttons (Power, Up/Down, Max/Min, pH/mV, Store/Recall)
4. AC Adapter input (117VAC)
5. RTD Temperature probe input (3.5mm phono jack)
6. BNC style pH/mV electrode input
7. Neck-strap loop (2)
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pH Overview
pH is a unit of measure (ranging from 0 to 14pH) indicating the degree of acidity or alkalinity of a
solution. pH tests are the most commonly performed measurements in water quality testing, using
the hydrogen ion activity of a solution to determine acidity or alkalinity. Solutions with a pH less than
7 are considered acidic, solutions with a pH higher than 7 are known as bases, and solutions with a
pH of exactly 7 are considered neutral.
The pH scale is logarithmic, so, for example, if sample A is 1 pH less than Sample B, this means
that Sample A is 10 times more acidic then Sample B. A difference of 1 pH represents a ten-fold
difference in acidity.
ORP/REDOX Overview
ORP stands for Oxidation Reduction Potential and represents the oxidizing or reducing nature of a
solution. The overall “reactive” tendency of a solution can be determined from ORP measurements.
ORP testing is becoming more common in waste-water and water treatment measurement
regimens. The unit of measurement for ORP is mV.
Calibration and Operation
pH Calibration (ORP does not require calibration)
Before accurate measurements can be made, it is necessary to perform a 3-point calibration of the
meter with its electrode. Calibrate to a pH 7 buffer first, followed by a pH 4 (or 1.68) buffer and then
a pH 10 (or pH 12.45) buffer. The meter automatically recognizes the buffers listed in the table
below and calibrates itself to the buffer’s pH value.
1. Connect the pH electrode to the meter’s BNC connector input.
2. Open the top half of the meter to an appropriate viewing position.
3. Power the meter with the POWER/CAL button.
4. Place the electrode into a buffer solution.
5. Press and hold the CAL key until the CAL display icon appears.
6. During calibration, ‘CAL’ is shown on the display followed by ‘SA’ (saved).
7. When calibration is complete, the meter automatically displays ‘END’ and returns to the normal
operation mode. Repeat steps 1-5 as necessary. Note that it is not necessary to turn the meter
off and then back on again to calibrate each reference.
Error Message Note: The meter will display ‘E13’ if a calibration step fails. Try the calibration again
if ‘E13’ is displayed. The most common reason for the error is inaccurate or stale buffer solutions.
pH reading Range of measurement
1.68 0.00 to 1.68
4.00 1.68 to 6.50
7.00 6.50 to 7.50
10.00 7.50 to 12.45
12.45 12.45 to 14.00
Electrode note: Since pH electrodes can vary in performance, this meter displays an electrode’s
slope in %. For example, if two electrodes (one new and one moderately used) are calibrated in the
same pH 4 solution they’ll both display pH 4 on the meter. This is because the meter will accept one
pH value for a range of measurement values as shown in the table above (in this case, any reading
between 1.68pH and 6.50pH will be accepted as 4pH calibration). The meter then displays the
slope % for the electrode under test. If the slope % is below 75% or above 125%, the electrode
must be replaced. A slope of 100% is ideal.
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pH Measurement and Temperature Compensation
1. Use the pH/mV button to select the pH mode. The unit of measure appears on the LCD.
2. Connect the pH electrode to the meter and place the sensor end in the solution under test.
3. For automatic temperature compensation, connect the temperature probe to the meter (display
will read ATC) and place the sensor end in the solution about 1/3 of the way below the solution
surface. The temperature reading of the solution appears on the bottom of the LCD. When the
temperature of a sample differs from a buffer solution temperature, allow enough time for the
electrode to stabilize to the sample's temperature.
4. For manual temperature compensation, a temperature sensor is not connected to the meter.
(MANUAL is displayed). A manual thermometer will be needed to determine the solution
temperature first.
Adjust the meter’s temperature display with the up/down buttons so that the displayed
temperature matches the temperature of the solution.
5. To change the unit of measure for temperature (C to F or F to C), turn the unit OFF then
complete the following steps. Press and continue to hold the pH/mV button and then press and
hold the Power button. Release the pH/mV button first then release the power button. The LCD
reflects the unit of measure.
6. Read the pH measurement on the main display. An out of range reading is indicated by dashes
( ----- ).
7. When the test is complete, unplug the electrode and rinse it in distilled water.
8. Place approx. 1 ml of pH 4 solution in the wetting cap before replacing it.
mV (ORP) Measurements
1. Note that calibration is not required for mV (ORP) measurements.
2. Use the pH/mV button to select the mV mode. The display will reflect the unit of measure.
3. Remove the wetting cap from the ORP electrode and connect the cable via the BNC meter
connection.
4. Rinse the ORP electrode and place it into a sample solution. When the LCD stabilizes it will
read the redox potential of the sample in millivolts.
5. When sampling is complete, unplug and rinse the electrode. Place a small portion (1ml) of
distilled water in the wetting cap. Place the cap over the electrode.
25-Reading Measurement Storage
1. Press the STORE/RECALL button to store the current reading. Press each time a reading is to
be stored.
2. If an attempt is made to store more than 25 readings, the stored readings (starting with the first
reading) will be overwritten.
3. To recall readings, press and hold the STORE/RECALL button until the ‘RECALL’ icon appears
on the LCD. Use the up/down arrow buttons to scroll through the stored readings. Note that
‘NULL’ is displayed if there are no readings in memory.
4. To exit this mode, press and hold the STORE/RECALL button until the ‘RECALL’ icon
disappears.
5. To clear the contents of the memory press and hold the up and the down arrow buttons while
powering the meter on until the ‘CLr’ icon appears on the LCD. All 25 locations will be erased.
Note: Readings are stored in non-volatile memory (saved when the meter is turned off).
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MAX/MIN Display
1. The meter memorizes the highest (MAX) and lowest (MIN) readings when prompted.
2. Press and hold the MAX/MIN button until both the MAX and MIN icons appear on the LCD. The
meter will now begin keeping track of the MIN and MAX readings.
3. To view MAX/MIN values, press the MAX/MIN button again; the meter automatically displays the
highest and lowest readings in succession and then returns to the MAX/MIN recording mode.
4. To exit the MAX/MIN mode, press and hold the MAX/MIN button until the MAX and MIN icons
disappear.
5. To clear the MAX/MIN memory, cycle the meter power.
External Temperature Offset Adjustment
The Offset Adjustment is used to fine tune the temperature reading of the external temperature
probe. This procedure is for the external probe only when ATC is active.
1. Place the temperature probe into a known temperature and note any temperature reading error.
2. Simultaneously Press and Release the ▲and ▼buttons, 0.0 will appear on the LCD
temperature reading
3. .Press the ▲or ▼button to set the display equal to the error value determined in step 1.
4. Press the STORE button to save the offset value into memory,
5. Test the temperature probe in the know temperature source to verify the correction was proper
and the adjustment made in the correct direction.
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pH Electrode Model 60120B Operation
The Following information applies to the Epoxy Body, Sealed Reference Combination pH Electrode
Model 60120B.
Electrode Considerations
1. The 60120B pH electrode is recessed in the polymer body allowing it to rest against the bottom
of a beaker without damaging the glass bulb. This eliminates the need for electrode holders and
allows the probe to be used as a stirring rod. This sealed reference design eliminates the need
for adding filling solutions (minimizing "dry-out") and can be used in up to 100 psig systems
without external pressurization.
2. The Electrode should remain in its bottle or cap until used.
3. If bubbles are seen in the bulb area, hold the electrode by its cap and shake downwards until
bubbles disappear.
4. To improve speed of response, vigorously stir the electrode in the sample, buffer, or rinse
solution.
5. After exposure to a sample, buffer, or rinse solution, shake the electrode with a snap motion to
remove residual drops of solution.
6. Use part of the sample/buffer to be tested next as a rinse solution whenever possible.
7. When calibrating, use a buffer as close as possible to the expected pH of the sample.
8. Keep buffers and samples at the same temperature to avoid temperature effects.
9. pH readings stabilize at various rates; allow time for readings to stabilize.
10. Electrodes deteriorate over time. If accuracy falls to 10% (slope), the electrode should be
cleaned. If no improvement is observed, replace the electrode.
Electrode Calibration and Cleaning
Refer to the earlier section ‘Calibration and Operation’ for calibration details. Refer to the section
below ‘Maintenance and Troubleshooting’ for details on electrode cleaning.
Electrode Storage
The electrode can be stored in the soaker bottle or wetting cap. For the storage bottle, slide the
cover onto the electrode, replace the O-ring, and insert electrode into the bottle firmly tightening the
cap. Ensure that the bottle or cap is filled with a pH 4 buffer solution.
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Specifications
Range (Resolution) Accuracy
mV ± 1000 mV DC (1 mV) + 2mV
Temperature 32.0 to 212.0oF (0.0 to 99.9oC) + 0.8oF (0.5oC)
pH 0.00 to 14.00pH (0.01pH) + 0.02pH
Temperature Compensation 32 to 212oF (0-100oC) AUTO or MANUAL modes
Power 9 volt battery or optional AC adapter
Display Dual LCD display for simultaneous pH or mV and
temperature readings. LCD viewing angle: 90oto 180o
Over-range Indication Displays " ---- "
Power 9 volt battery or optional AC adapter
Auto Power OFF After 10 minutes of inactivity
Low Battery Indication Battery icon appears on LCD
Operating Temperature 41ºF to 104ºF (5ºC to 40ºC)
Storage Temperature - 4oF to 140oF (-20oC to 60oC)
Operating Humidity Max 80% up to 87ºF (31ºC) decreasing linearly to 50% at
104ºF (40ºC)
Storage Humidity <80%
Operating Altitude 7000ft. (2000meters) maximum
Dimensions / Weight 3.75 x 4.25 x 2" (96 x 108 x 45mm) / 12 oz (340g)
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Maintenance and Troubleshooting
Electrode Cleaning
The type of electrode coating that occurs over time will determine the cleaning method. Soft
coatings can be removed by vigorous stirring or by using a squirt bottle. Organic chemical coating
(hard coatings) should be chemically removed. Only in extreme cases should the bulb be cleaned
mechanically.
Battery Replacement
Install a new battery when the low battery indicator appears on the LCD.
1. Open the calibrator’s lid as far as possible.
2. Open the battery compartment using a coin at the arrow indicator.
3. Replace the battery and close the cover.
Battery Safety Reminders
Please dispose of batteries responsibly; always observe local, state, and federal regulations
with regard to battery disposal.
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
Troubleshooting the Meter
Meters are the least likely cause of pH measurement problems. To rule out the meter check the
following:
1. Check the 9V battery and replace it if necessary.
2. When using the AC adaptor for power, check that the line cord is firmly connected to the meter.
3. Replace the existing electrode connector with optional BNC shorting plug (shorts the ground
ring to the center pin of the meter’s BNC jack) and check the following:
a) Set the measurement mode to pH. The LCD reading should be stable.
b) Adjust the calibration control for an LCD reading of 7.00.
c) Change to the mV measurement mode. The LCD should read 0 mV.
d) Note that an out of range reading is indicated by dashes ( -------).
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Troubleshooting an Electrode Problem
Symptom Cause Recommended Solution
Long response time or
reading drift
Clogged Junction Soak in 4.07 M Potassium Chloride (KCl)
@ 60oC for 30 minutes. Replace
electrode if necessary.
Strong Alkaline measurement Soak in 0.1 M HCL overnight
Deteriorated Gel layer of pH
sensing membrane
Replace electrode
Protein coating on electrode
surface
Soak in 1 gm Pepsin dissolved in 100ml
of 0.1 m HCL for 30 mins. or as needed
Oil, paint, dyes, suspended
solids on sensor
Rinse electrode alternately with materials
solvent (briefly) then a buffer 7.00
Organic solvents are coating
sensor
Organic mole fraction has to be less than
50% to assure reasonable readings. Limit
time of measurement. Keep probe in the
7.0 buffer between readings.
Dehydrated membrane Read solution for dry bulb below
Dry Bulb Long term storage without
wetting
Soak electrode tip in wetting cap filled
with 1ml 7.00 buffer for 24 to 48 hours
Static Charge Wiping electrodes Rinse electrode in 7.0 buffer and blot. Do
no wipe electrode.
Same readings in
different buffers and
samples
Cracked or broken bulb Replace electrode. Use bulb guard. Avoid
plunging electrode to bottom of container
and spinning bars. A wetting cap will
protect bulb between measurements.
Erratic LCD display Samples have low ionic
strength (lacks salt); e.g.
distilled, de-ionized, boiled,
lake water (high pressure)
For each 50 ml of sample add 1 drop
(50uL) of SAT.KCL No alteration in pH
will occur by inert KCL.
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Warranty
FLIRSystems,Inc.warrantsthisExtechInstrumentsbranddevicetobefreeofdefectsinpartsandworkmanshipforoneyear
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