H25-IR PRO Instruction Manual
Glossary of Terms
P/N: 3015-5678 Rev 6
103
Term
Description
NDIR sensor
An NDIR sensor is a device that detects the presence of gas by measuring the amount of
infrared light that is absorbed by a sample. The NDIR sensor is a cylindrical tube containing an
emitter at one end and a highly sensitive detector at the other. The emitter generates a
focused infrared beam through the gas sample and toward the detector. The light that is not
absorbed by the gas drawn into the chamber strikes the detector. Comparing the amount of
light emitted versus what was detected gives a differential that is then matched against the gas
type setting and other values to determine the quantity and leak rate of the gas.
numeric display
Numeric display is one of two display styles from which the
operator may choose for displaying the search mode screen. (The
other display style is graphic display mode.) This user preference is
set from the Display Style option in the Basic Setup menu (see
Display Styles (Graphic vs. Numeric) on page 36, Basic Setup Screen
on page 45, and Display Style on page 51). Note that the numeric
display is also used exclusively in measure mode.
log limit
The log limit is used in totalizer applications with the measurement log. It is an alarm setpoint
based on the accumulated sum of logged data point values. Refer to
totalizer
for more
information.
measurement log
The measurement log is a 50-element array into which the operator may store (or
log
) gas
readings. Gas values and time/date stamps are stored sequentially when the operator chooses
to log the data point. Menu options permit the clearing of individual data points or the entire
measurement log.
search mode
Search mode is one of two main operating modes of the H25-IR PRO. It is used to locate a leak
and is typically use
before
using measure mode.
totalizer
Totalizer is a unique gas detection/alarm application in which the leak rate of
multiple
sample
points are logged and then summed. This summed leak rate is compared to a user-
programmable setpoint (the Log Limit option of the Advanced Setup menu). If the summed
leak rate exceeds the Log Limit setpoint, external alerts can be generated using the
configurable relay outputs (e.g., horns, warning lights, etc.).
unit display
Unit display is a programmable option in the H25-IR PRO that defines the engineering units to
be used by the instrument. The H25-IR PRO is used to locate and quantify refrigerant gas leak
rates, so available engineering units include oz/yr, g/yr, mL/sec-5, Pa·M/sec-5, and PPM.
Available display units are listed in Table 5-9 on page 48.
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