27
C.
How to calibrate the conductivity/temperature sensor module
There can be up to 3 (three) calibration procedures for conductivity:
1.
Low range (Air-zero) – no standard solution required
2.
Mid-range (Standard) – 13.40 or 14.00 mS standard solution required
3.
High range – 100.0 mS standard solution required
The 90XL conductivity/temperature sensor module is capable of measuring
conductivities through a range of 1 uS to 200 mS. For the typical range of final
dialysate conductivities, the sensor module needs to be calibrated at the mid-
range only. This will yield high accuracy and precision in this range, with
reasonable accuracy and precision at the low and high extremes. If a higher level
of accuracy and precision is needed at the extreme ends of the total range, then
the sensor module should be calibrated using the optional “air-zero” (Low-range)
and 100.0 mS (High-range) calibration procedures. If enhanced accuracy and
precision are required throughout the entire conductivity range, then all three
calibration procedures should be performed in the order as indicated above: (i.e.,
Low--> Mid -->High)
To enter the calibration mode for the selected sensor module:
First, select the appropriate condo/temp module on the MAIN screen by using the
key.
From the MAIN screen press MENU. Scroll down using the down arrow key
to “CALIBRATION” then press “SEL”.