Teledyne 200E, Instruction Manual, Page: 103 / 302

Operating Instructions Model 200E Instruction Manual
most common parameters are concentrations of measured gases (NO
X
, NO and NO
2
),
temperatures of heated zones (NO
2
converter, reaction cell, box temperature…), pressures
and flows of the pneumatic subsystem and other diagnostic measurements as well as
calibration data (slope and offset) for each gas.
Most data parameters have associated measurement units, such as mV, ppb, cm³/min, etc.,
although some parameters have no units. The only units that can be changed are those of
the concentration readings according to the
SETUP-RANGE settings. Note that the iDAS
does not keep track of the unit of each concentration value and iDAS data files may contain
concentrations in multiple units if the unit was changed during data acquisition.
Each data parameter has user-configurable functions that define how the data are recorded
(Table 6-21).
Table 6-21: iDAS Data Parameter Functions
Function Effect
PARAMETER Instrument-specific parameter name.
SAMPLE MODE INST: Records instantaneous reading.
AVG: Records average reading during reporting interval.
MIN: Records minimum (instantaneous) reading during reporting interval.
MAX: Records maximum (instantaneous) reading during reporting interval.
PRECISION Decimal precision of parameter value(0-4).
STORE NUM. SAMPLES OFF: stores only the average (default).
ON: stores the average and the number of samples in each average for a
parameter. This property is only useful when the AVG sample mode is used.
Note that the number of samples is the same for all parameters in one
channel and needs to be specified only for one of the parameters.
Users can specify up to 50 parameters per data channel (the M200E has about 30 para-
meters). The number of parameters and channels is also limited by available memory.
6.10.1.3. iDAS Triggering Events
Triggering events define when and how the iDAS records a measurement of any given data
channel. Triggering events are firmware-specific and are listed in Appendix A-5. The most
common triggering events are:
• ATIMER: Sampling at regular intervals specified by an automatic timer. Most
trending information is usually stored at such regular intervals, which can be
instantaneous or averaged.
• EXITZR, EXITSP, SLPCHG (exit zero, exit span, slope change): Sampling at the end
of (irregularly occurring) calibrations or when the response slope changes. These
triggering events create instantaneous data points for the new slope and offset (con-
centration response) values at the end of a calibration. Zero and slope values can be
used to monitor response drift and to document when the instrument was calibrated.
• WARNINGS: Some data may be useful when stored if one of several warning
messages appears. This is helpful for trouble-shooting by monitoring when a
particular warning occurred.
88 044100102 Rev A