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High Technology, Inc.
109 Production Road,
Walpole MA 02081 USA
Document Number
OM-E-FC-360-30
Revision Level
Rev. 3
Prepared by
J.S. Bolio
Approved by
S. Titov
Effective Date
8/15/2016
Operator’s Manual: HTI BioChem FC-360
HIGH TECHNOLOGY, INC. PROPRIETARY AND CONFIDENTIAL
Page 167 of 222
Surfactants.
Virtually all surfactants can irreversibly harm ISE electrodes. Most oils, emulsions, many
organic chemicals, as well as certain inorganic chemicals and buffers, can also harm the electrodes
(sometimes
QC Materials.
Caution must be exercised when selecting quality control materials. QC materials
specifically designed for use with ion-selective electrodes usually perform suitably, but we can only
guarantee that QC materials it has validated are compatible with its electrodes. QC materials should be
run after each calibration to ensure the integrity of sample results.
Reagent Kit Electronic Key
The ISE reagent kit uses a memory device in order to store module information. Update information will
be stored in the device. Information includes such data as: expiration date, distributor code, module size,
lot number, security key. The update information includes the install date, a means to calculate a
countdown of reagent kit usage, and information about why a kit was designated as no longer
acceptable (expiration, no remaining reagent, wrong distributor code).
Sample Aspirating and Dispensing
The sample delivered to the ISE Module must not be contaminated or further diluted. The wash solution,
usually deionized water, is the most serious contaminant. Sample pickup and delivery to the ISE Module
must be highly controlled and consistent.
Samples and calibrators are positioned in front of the electrodes by three peristaltic pumps. Two separate
p
umps move Calibrant A and Calibrant B into the ISE Module’s sample entry port and a waste pump
positions samples and calibrants in front of the electrodes. The sample is deposited into the sample entry
port. After each sample measurement, calibrant is positioned in front of the electrodes for a single-point
calibration.
The removal of protein build-up on the electrodes and fluid path is accomplished by the use of cleaning
solution. Cleaning solution is placed in a cup on the host analyzer sample tray, aspirated, and deposited
into the sample entry port by the host analyzer.
Calibration Cycle
These millivolt readings are then used to set up a relationship between sample concentration and
electrode millivolt output. The change in millivolts per change in concentration is the slope of the electrode.
The slope of the electrodes is reported in mv/dec (millivolts per decade change in concentration), and
should be within the following limits:
Li+ 47-64 mV/dec
Na+ 52-64 mV/dec
K+ 52-64 mV/dec
Cl- 40-55 mV/dec