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PAWKIT

4.1.2 VERIFY CALIBRATION

Use the following steps to verify the PAWKIT calibration.

NOTE: An error code of 9.99 at any time during the process indicates that the sensor has failed and that the

instrument needs to be serviced. Refer to Section4.4 for shipping instructions.

1. Using a vial of the 0.760 a

NaCl standard, empty the entire contents of the vial into a

sample cup.

2. Place the PAWKIT over the sample cup as described in the Section2.1.2.

3. Press the I button to take a reading.

If it is reading the correct water activity (±0.02), the PAWKIT needs no adjustment for this

standard. Skip to step7.

If the first reading was not the correct water activity (±0.02), clean the PAWKIT according

to the instructions in Section4.2 and take a second reading.

If the second reading is the correct water activity (±0.02), the PAWKIT needs no

adjustment at this time. Skip to step7. If the second reading is not correct, continue to

the next step.

4. Press the II button (on the right) once to get the Calibration Mode screen (Figure13).

Once the reading is ﬁnished, the II button (on the right) activates. The II button is only

active until the PAWKIT shuts itself off.

Figure13 Calibration Mode screen

Figure13 shows that the PAWKIT is ready to have its calibration adjusted up for the

0.76 standard. The number in the upper right corner indicates the water activity

measurement that the PAWKIT just read. Press the II button to scroll through the other

selections. They are: u76, d76, u25, d25, Sto, u92, and d92. The u and d before each

number stand for up or down adjustment for each standard. The numbers (25, 76, and

92) correspond to the water activity of a veriﬁcation standard (0.76, 0.25, and 0.92 a

)

The Sto position stores a reading.

EXAMPLE:

If the NaCl reading is lower than it should be, press the II button to scroll to

u76 (adjust up for 0.76 standard). If the reading is higher than it should be, scroll to

d76 (adjust down for 0.76 standard).

NOTE: Scroll feature is continuous, so if desired adjustment screen is passed, keep pressing the II button

until cycled back to the correct screen.

METER AQUALAB PAWKIT User Manual

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