Tris-Compatible Flat pH Sensor (FPH-BTA)

• Specifications and User Guide
• Which model pH sensor do I have? (How old is my pH sensor?)

Troubleshooting

• Primary Test: Does it read approximately 4 in its storage solution? (pH 13-14 indicates 0 volts, possibly a defective or damaged sensor)
• Secondary Test: Take readings in fresh buffers, NOT distilled water! If no buffers are available, try it in vinegar (~ pH 2.5-3.5) and ammonia (~ pH 10.5-11.5). If readings do not change when the sensor is placed in different solutions, the sensor is possibly defective or damaged.

Additional Troubleshooting

OPERATION

• My Tris-Compatible Flat pH Sensor reads mV instead of pH.
• Why doesn't my pH Sensor read pH 7 in distilled or deionized water?
• The pH electrode I have been using no longer seems to work or is slow to respond. Is there anything I can do to fix it?
• What type of liquids cause problems for the pH Sensor?
• The liquid inside my pH Sensor is low or gone. Will it still work?
• Will I get interference when I put two sensors in the same solution?
• Is the flat pH sensor more durable than regular pH sensor?

CALIBRATION

• How do I calibrate my sensor?
• How do I calibrate a sensor in Logger Pro?
• How do I save a custom calibration to my pH sensor?
• During calibration, what are the typical potential output readings for the PH-BNC electrode?

MAINTENANCE and STORAGE

• How can I keep my pH or ORP storage solution from spilling when the sensor is in use?
• Where do I get pH or ORP Storage Solution? (Buffer Storage Solution)
• What is the best way to clean the glass bulb of the pH electrode?
• Do any of your sensors require special storage?
• I bought your pH buffer capsules. Can I make storage solution for my pH Sensors with this kit?
• My pH sensors were stored dry. Will they still work?
• How do I dispose of my pH sensor?

Specifications

• Electrode type: Double-junction, sealed, gel-filled, Ag/AgCl reference, polycarbonate body
• Membrane style: Flat glass
• Range: pH 0–14 (Some sodium error in ranges greater than pH 12 due to thicker glass and higher impedance values)
• Accuracy with new electrode (pH): ±0.2
• Temperature range: 5 to 80 °C (readings not compensated)
  ⚬ Isopotential pH: pH 7 (point at which temperature has no effect)
• Storage solution: pH 4/KCl solution (10 g KCl in 100 mL buffer pH-4 solution)
• Dimensions
  ⚬ Shaft diameter: 12 mm OD
  ⚬ Cable: 1 meter coaxial cable with BNC connector
• Default calibration coefficients: slope –7.78; intercept 16.34

Calibration

Calibrate? Usually no. However, for the most accurate measurements with this sensor, we recommend calibration. It is a simple process that only takes a few minutes. Custom calibrations can also be stored directly onto the sensor.

• For calibration instructions, see: How do I calibrate my sensor?
• To save a calibration to a particular sensor, see: How do I save a custom calibration to my pH sensor?
• Where do I get pH buffer solutions?

Typical Calibration Voltages
⚬ In pH 4 buffer: ~1.56 V
⚬ In pH 7 buffer: ~1.19 V
⚬ In pH 10 buffer: ~0.82 V