7 VERIFICATION AND CALIBRATION AquaLab TDL
instrument from one of our international distributors, please contact
them for local service and support.
Note: A linear offset does not adjust the calibration for all water
activity levels and should only be used if the user intends to measure
water activity in a very small range.
Multi-Point Calibration for New Temperatures
1. The AquaLab TDL is optimized for performance at specific
temperatures. If testing is to be conducted at new tempera-
tures, an updated calibration will be needed. If a temperature
setting that has not been used previously is chosen, an error
message will appear instructing the user that the calibration
needs to be updated.
Note: Factory calibrations performed by METER are locked
and cannot be updated with a multipoint calibration, only with
a linear offset as outlined above.
This update can be either a 1 point linear offset (see instruction
for adjusting for linear offset) or a multi-point update, which
requires reading multiple water activity standards.
2. Change instrument temperature setting to desired testing tem-
perature.
3. You will need 0.25 a
w
, 0.50 a
w
, 0.76 a
w
and 1.00 a
w
unsatu-
rated salt standards from METER to proceed with multi-point
40
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