Datasheet

LF444

SNOSC04D –MAY 1998–REVISED MARCH 2013

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Typical Application

Figure 28. pH Probe Amplifier/Temperature Compensator

***For R2 = 50k, R4 = 330k ±1%

For R2 = 100k, R4 = 75k ±1%

For R2 = 200k, R4 = 56k ±1%

**Polystyrene

*Film resistor type RN60C

To calibrate, insert probe in pH =7 solution. Set the “TEMPERATURE ADJUST” pot, R2, to correspond to the solution

temperature: full clockwise for 0°C, and proportionately for intermediate temperatures, using a turns-counting dial.

Then set “CALIBRATE” pot so output reads 7V.

Typical probe = Ingold Electrodes #465-35

Detailed Schematic

Figure 29. 1/4 Quad

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