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i dunno what ATC is
but when we calibrate pH probes in the lab, we always do 2 points, 4 and 7
one point calibration isn't very accurate
ok: how important is ATC and 2/3 point calibration vs 1 point calibration?
ie: comparing between the eutech phscan 1 and phscan 2
i dunno what ATC is
but when we calibrate pH probes in the lab, we always do 2 points, 4 and 7
one point calibration isn't very accurate
I think ATC means Automatic Temperature Compensation.
pH will varies with the temperature so this is to ensure that the pH reading is not affected by the temperature of the solution.
yeah, the thing being, how much of a variation am I expecting.
phscan1 = ±0.2 pH accuracy
phscan2 = ±0.1 pH accuracy
does this mean: all things being equal, without ATC/2 point calibration, I should only expect 0.2 ph variation OR that's not what it means.
(which is to say, atc/2point calib increases accuracy by ±0.1?) if that's all its doing, then I'll go for the cheaper one..
ok: I just bought the phscan 1 (at $100, phscan2 at $115 but no stock but didn't want to wait anyway)
she's out of ph7 buffer, what is ph7 buffer liquid? if its distilled RO water, then I buy that instead. hehe.
second time I'm using it.
problems I encounter.
a) calibrate at 7.0
b) put in tap water, tap water says 6.9
c) put in tank , reading fluctuates like mad,
d) put back in tap water, tap water says 7.3
---
is this a problem of temperature? ie: no ATC..
ie: properway to use would be
a) calibrate at 7.0 at room temperature
b) put in tap water at room temp
c) take sample of tank water, allow it to go to room temp before testing..
calibrate at tank water temperature
confirm safest
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