Extech 341350A-P Operating Manual
User's Guide
Oyster Meter
pH-Conductivity-TDS-Salinity-ORP(mV)
Model 341350A
INTRODUCTION
Congratulations on your purchase of the Extech's Oyster Series meter. This device measures
pH, Conductivity, TDS, ORP and Salinity. These meters are intended for routine laboratory
and field testing. Accurate measurements are provided in a battery operated, portable meter
with a hinged display that can be adjusted to any viewing angle.
METER DESCRIPTION
Front and Side panels
1. LCD display
2. Battery compartment
3. Power button
4. Up/Down arrow buttons
5. MODE/CAL button
6. UNIT/SET button
7. STORE/RECALL button
8. Connector, Conductivity probe
9. Connector, pH probe
10. Connector, Temperature probe
11. Connector, AC adapter
Display
1. Mode indicators
2. Primary display
3. Data held indicator
4. Probe renew indicator
5. Auto Power Off indicator
6. Low battery indicator
7. Memory status indicators
8. Calibration status indicators
9. Temperature display
10. Unit indicators
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OPERATING INSTRUCTIONS
Battery Installation/Replacement
Open the battery cover by inserting a small coin into the latch slot and pressing downward.
The cover will release in the direction of the arrow. Install the new battery and replace the
cover.
pH Measurements
1. Press the POWER button to turn the meter on. (the meter will cycle through a self
check)
2. Press the MODE/CAL button until the PH icon is on.
3. Press the UNIT/SET button to select ºC or ºF.
4. Connect the pH electrode to the side pH BNC connector.
5. Adjust the ▲▼buttons to the temperature of the solution (or use the external
temperature probe).
6. If required, calibrate the electrode. (see pH Calibration)
7. Place the electrode in the sample solution and read the pH value on the display.
8. When all measurements have been taken, unplug the electrode and rinse in distilled
water, shake and store in the wetting cap or a pH 4 buffer solution.
Conductivity/TDS/Salt Measurements
1. Press the POWER button to turn the meter on.
2. Press the MODE/CAL button until the COND, SALT or TDS icon is on.
3. Connect the conductivity electrode to the side conductivity connector.
4. If required, calibrate the electrode. (see Conductivity Calibration)
5. Place the electrode in the sample solution and read the value on the display.
6. When finished, unplug the electrode and rinse in distilled water.
ORP (mV) Measurements
1. Press the POWER button to turn the meter on.
2. Press the MODE/CAL button until the ORP icon is on.
3. Connect the ORP electrode to the side ORP BNC connector.
4. Place the electrode in the sample solution and read the mV value on the display.
5. When all measurements have been taken, unplug the electrode and rinse in distilled
water.
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341350A V1.1 1/09
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