In-Situ TROLL 9500 Operators Manual - Manual (Page 152)

147
Multi-Parameter
Water Quality TROLL ®
TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
GLOSSARY
ABend: Indication in the software interface that a test has come to an
“ABnormal END”—usually because the device memory is full, or
power was lost.
ABS: Acrylonitrile Butadiene Styrene, a plastic material.
Absolute pressure sensor: Non-vented pressure sensor that measures
all pressure forces detected by the strain gauge, including atmo-
spheric pressure. Fluid levels measured with an absolute pressure
sensor must be corrected through subtraction of the atmospheric
pressure to obtain accurate fluid level measurements. Compare
Gauged pressure sensor.
AC: Absolute or Actual Conductivity.
Accuracy: Closeness of agreement between the result of a measure-
ment and the true value. Usually expressed as a deviation from
100% accuracy.
A/D (analog to digital) converter: Converts an electrical signal to a
numeric value that can be interpreted by a computer.
Ambient pressure (temperature): The pressure (temperature) of the
medium surrounding the sensor or instrument.
Ammonia (NH
3
): A toxic, colorless gas with a pungent odor, highly
water-soluble.
Ammonium (NH
4
+ ): Solvated ammonium cation produced when am-
monia gas is dissolved in water.
Ammonium chloride (NH
4
Cl): A salt used to make ammonium and
chloride calibration standards.
Anion: Negatively charged ion (e.g., Cl – , NO
3
– ).
Atmospheric pressure: Pressure due to the atmosphere, altitude-de-
pendent.
Barometric pressure, see Atmospheric pressure
Bithermal: At two temperatures, e.g., a three-point calibration of an
ammonium, chloride, or nitrate sensor conducted at two different
temperatures.
Basic sensor set: pH, pH/ORP, conductivity, and polarographic (Clark
cell) dissolved oxygen; compare Extended sensor set.
Boxcar filtering: A smoothing scheme that looks at the 5 most recent
data points.
Cable, see Comunication cable, Network cable, RuggedCable, TROLL
Com, Vented cable
Calibration: The process of determining the response of a measure-
ment system to a known amount of the measured component in
order to permit the measurement of unknown samples.
Calibration, out-of-box: Use of new Basic sensors for the MP TROLL
9500 directly from the box, with factory-supplied calibration coeffi-
cients. Sensors should be calibrated after they are used and begin
to drift.
Calibration, Quick Cal: A rapid calibration procedure available for the
Basic sensors, using a single solution.
Calibration, traditional: Single- or multi-point methods for calibrating
water-quality sensors individually to gain higher accuracy.
Calibration coefficients: Sensor slope and offset that convert analog
measurements to user units; calculated during calibration.
Calibration cup: Clear PVC vessel that attaches to the front end of the
MP TROLL 9500 in place of the restrictor and holds the recom-
mended amount of calibration solution during calibration of the
water-quality sensors.
Calibration kit: Boxed set of standards for calibrating a specific water-
quality sensor for operation in a specific range.
Calibration solution, Calibration standard: A solution whose concentra-
tion is accurately known.