805 / 836
Glossary
Linearity
The linearity of an analytical procedure is its
ability (within a given range) to obtain test
results which are directly proportional to the
concentration of analyte in the sample.
LOAEL
Lowest-observed-adverse-effect level.
LR
Low Range.
LSD
Low Significant Digit.
LT Glass
This glass is used on our flat and conical
shaped membranes as well as sensors used
at cold temperatures, because the glass has
lower impedance. If anelectrodehas veryhigh
impedance, the measurement response will
be sluggish, and a voltage drop causing error
can occur. At temperatures below -8ºC (17°F)
the internal buffer may freeze and expand
and cause the mechanical destruction of the
sensor. This glass has a more limited pH range
and is dark green.
Lux (lx)
The SI unit of illuminance and luminous
emittancemeasuring luminous power per area.
Matching Pin
A matching pin is a differential measurement
technique used to eliminate ground loops
and common mode perturbations for the
measurement system. In a system without a
matching pin, electrical currents in the sample
can affect the reference half cell voltage
that is connected via the liquid junction with
the sample.
In this case, the reference electrode
picks up the electromagnetic fields and
the measurement of the pH is altered.
The matching pin isolates these current/
magnetic fields from the reference electrode.
Hanna manufactures a number of models
with the matching pin design for safe precise
pH measurements.
MEADOS
Measuring and Dosing System.
MEBAK
Central European Brewing Commission.
meq/L
Milliequivalents per liter.
In case of alkalinity: 1 meq/L = 50 mg/L CaCO₃
= 2.8 dKH.
Mho/cm
see S/cm.
Millesimal pH Buffer
This line of buffers with millesimal accuracy
(±0.002 pH), has been prepared to meet
the increasing need for assured accuracy in
pH measurements. Each bottle is provided
with a certificate of analysis, prepared by
comparison with NIST standards.
MR
Medium Range.
MTC
Manual Temperature Compensation. The
temperature value, shown on the LCD,
can be manually set. The compensation is
referenced at the selected temperature.
mV
1/1000 of a volt, a measure of electrical
potential (voltage).
NIST
National
Institute
of
Standards
and
Technology.
nm
Nanometer. Unit of measurement for length
in the metric system, equal to one billionth of
a meter.
NoTC
No Temperature Compensation. For actual
conductivity or TDS measurement, the
temperature value shown on the LCD is not
taken into account.
NPK
Nitrogen, phosphorus, and potassium.
17
Glossary
17.13
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