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I am going to choose an op-amp as a buffer for my pH sensor. How much slew rate of an op-amp is important in choosing my op-amp?

The slew rate of op-amp that I search range from 0.02 V/µs to 12 V/µs.

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    \$\begingroup\$ How fast does the pH change?? \$\endgroup\$ – Brian Drummond Mar 12 '17 at 13:49
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    \$\begingroup\$ It's only relevant for large high frequency signals, or step responses \$\endgroup\$ – Sunnyskyguy EE75 Mar 12 '17 at 14:15
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You only need to worry about slew rate for quickly changing signals, like audio for instance.

pH measurements change so slowly that you can ignore slew rate, and choose the amplifier on power consumption or price.

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    \$\begingroup\$ For pH, lowest bias current or highest input impedance would probably be better metrics. \$\endgroup\$ – Matt Young Nov 13 '17 at 23:41

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