Storage - Awareness Technology Stat Fax 4200 Operator's Manual

Calibration and Linearity (Continued)
Pipetting errors can be identified by comparing duplicate readings. The instrument should
give the expected value ± (1% of the expected value + .01A).
For example, if the 1/4 dilution reads .520 A, then you can expect your 1/2 dilution sample to
read twice as much or 1.04 A ± [(1% of 1.04) +0.01 A], which is ± .02.
A good working instrument would then give a result between 1.02 A and 1.06 A. You will
know that your filters are deteriorating when darkly colored solutions consistently read
lower than expected.
Since the procedures for verifying the calibration and linearity of a vertical photometer are
quite cumbersome and not conducive to stringent criteria, the best way to assure quality
instrument performance is with DRI-DYE® Check Strips.

3.2.2 Storage

The instrument may be stored under the following recommended environmental conditions:
• Temperature: 10 to 50°C
Humidity: Less than 80% relative humidity, non-condensing.
•
Store the instrument using original packaging if possible.
Perform the following steps before storing:
Set the power switch to OFF and remove the power cord.

Place the instrument in the original packaging material.

When returning the instrument to service from storage, it is recommended that

functional tests be performed as if setting up the instrument for the first time.
Stat Fax ® 4200 Operator's Manual Doc. 4200 Rev. K 51