Specifications

nISE – Pl eas e refer t o page 85 o f
this catalogue
.
nISFET or Ion Sensitive Field Eect Transistor
is a non-glass electrode typically used
for food, beverage and pharmaceutical
applications where the use of glass
electrodes on the production floor is
prohibited. ISFET electrodes rely on a silicone
chip which, when placed in contact with the
sample, detects and measures the variable
voltage potential between its surface and
underlying semiconductor material.
This
variable potential that is proportional to the
hydrogen ion concentration in the sample is
used to derive the pH value.
nISO 7027 is the water quality standard
measured in terms of
Turbidity determined
by the International
Organisation for
Standardisation. For more information on
ISO, please refer to the website www.iso.org
Eutech Turbidimeters TN 100 and TB 1000
(infrared light source models) comply with
the ISO 7027 standards.
nkPA or Kilopascal refers to a unit of pressure.
1 kPa is approximately the pressure exerted
by a 10-g mass resting on a 1-cm
2
area.
101.3 kPa = 1 atm. There are 1000 pascals in
1 kilopascal.
nKCl refers to the Chemical Compound
Potassium Chloride which is a metal halide
composed of potassium and chlorine. KCl is
used in medicine, scientic applications and
food processing. A heated diluted KCl can
be used to unclog a reference junction. For
more information on electrode cleansing,
please refer to page 1
2 of this catalogue.
nLSD or Least Signicant Digit refers to the
right-most active digit of a digital display.
nMTC or Manual Temperature Compensation
is an alternative method for temperature
compensation through the manual input
of sample temperature value.
ATC is more
practical in most applications.
nMultiple-Point Calibration ensures
the highest accuracy across the full
measurement range.
nNIST or National Institute of Standards
and Technology is a non-regulator y
agency of the United States Department
of Commerce’s Technology Administration.
The institute’s mission is to develop
and
nFormazin Standards – Formazin was
rst established by the US Environmental
Protection Agency (See EPA) as a Turbidity
standard in 1926. However, its importance
as a standard has been relegated due to
its many shortcomings, one of which
being that one of the chemicals which
formazin is derived from, hydrazine sulphate,
is carcinogenic. Eutech’s Turbidity meters
use a safe, non-toxic, non-carcinogenic
alternative to formazin standards which
can be used for calibration directly without
mixing or dilution.
nGLP or Good Laboratory Practices refers
to regulations that are observed to ensure
high quality experimental standards and
reliable data.
nHVAC stands for Heating, Ventilation and
Air Conditioning System.
nHCl is the chemical formulation of Hydrogen
Chloride that is a highly corrosive and
toxic colorless gas that forms white fumes
on contact with humidity. These fumes
consist of hydrochloric acid which forms
when hydrogen chloride dissolves in
water. Hydrogen chloride gases as well as
hydrochloric acid are important chemicals in
chemistry, science, technology, and industry.
A 0.1 M HCl can be prepared as 1
% pepsin
solution to break down any protein deposits
on an electrode. For more information on
electrode cleansing, please refer to page 1
2
of this catalogue
.
nIP stands for ‘Ingress Protection’. An IP
number is used to specify the environmental
protection of enclosures around electronic
equipment. These ratings are determined by
specic tests.
The IP number is composed
of two numbers,
the rst referring to the
protection against solid objects and the
second against liquids. The higher the
number, the better the protection. Eutech
products such as the CyberScan
waterproof
series and
waterproof testers have IP67
housing. The first digit ‘6’ indicates total
protection against dust and second digit ‘7’
protects against the eects of immersion
between 15 cm and 1 m.
nIrDA Communications – IrDA stands
for Infrared Data Association, a group of
manufacturers who developed a standard
for transferring data via infrared light waves;
a secure wireless link that allows the meter
to be connected to a computer or printer
without the help of cables.
Glossary
page | 97
promote measurement, standards, and
technology to enhance productivity, facilitate
trade, and improve the quality of life.
The NIST buer standards usually refer to
pH 1.68, 4.01, 6.86, 9.18, and 12.45. For more
information, please visit www.nist.gov
nNTU or Nephelometric Units is the preferred
expression of
Turbidity. For more information
on
Turbidity, please refer to page 56 of
this catalogue
.
nNon-Volatile Memory retains stored data
and calibration information indefinitely
even if power is disconnected.
nNormalisation Temperature is used to
standardise measurements to a known
ambient temperature value (generally at
20 °C or 25 °C).
nOpen Pore pH Electrode makes use of
a single pore capillary reference junction
that is about 200* times larger than a
typical ceramic junction. (*With reference
to Eutech
open pore electrodes EC620130,
EC620131, EC620132 and EC620133.) This
unique construction protects the electrode
from clogging even in difficult samples.
If used in combination with specially
formulated electrolyte, the ow rate into
the pore is faster and leads to better
contact between the reference electrode
and sample. This generates a shorter
response ti me and more accur ate
measurements. For more information,
please refer to page 84 of this catalogue
.
nORP or Oxidation Reduction Potential
– Please refer to page 1
2 of this catalogue.
nOUR or Oxygen Uptake Rate values are
given in mg/L/hr and is usually applicable
in the study of the concentration of
micro-organisms.
nOzone – Please refer to page 60 of
this catalogue
.
npH – Pl eas e refer to p age 10 of
this catalogue
.
npH Slope - Please refer to page 10 and
11 of this catalogue.
nPWB or Pure Water Buer refers to water
with low ionic concentration.