Operation
Modline 5
93
Navigate from TEMP display with
&
▲▼
to ENGR then use
&
▲▼
to iALM
Display
Instructions
Display and Limits
iALM
Press ENT to view Invalid Condition Alarm selection.
OFF = Error Code Alarms only (includes the optional Dirty Window Detector
alarms)
ON = Error Code Alarms and Invalid Condition (INV and pINV) activated as
Alarms. This function also turns on the Attenuation Alarm.
Use Up / Down Arrows to select.
Press ENT
to save and return to TEMP display.
OFF or ON
5.6.11
ATTN – Selects Attenuation Alarm Threshold
Set the percent attenuation alarm threshold. Any attenuation greater than this value will turn on the
alarm and also turn on the Dirty Window LED on the back panel. Setting this to 95 will turn this alarm
off since that is the invalid threshold. The iALM must be set on in order to enable this alarm.
Navigate from TEMP display with
&
▲▼
to ENGR then use
&
▲▼
to ATTN
Display
Instructions
Display and Limits
ATTN
Press ENT to view Attenuation Threshold.
Use Up / Down Arrows to select.
Press ENT
to save and return to TEMP display.
10% - 95%
Background:
With most two-color infrared thermometers, an invalid indication is reached when the reduction in
signal from the target is greater than 95 percent. When the signal reduction is too great, an invalid
condition occurs. This variation can be caused by emission characteristics of the target or the target
being too small to completely resolve, as well as obstructions in the sight path (i.e., certain types of
smoke). When an invalid condition occurs, an alarm output is provided to indicate the signal variation
is too great between the two detectors. While this type of detection method is suitable for many
applications, there are some instances where the user wants to adjust the sensitivity level of attenuation.
The Modline 5 attenuation adjustment alarming feature operates independent from the optional dirty
window detector, which will monitor the sensor window for contamination. It enables users to monitor
any kind of signal attenuation caused by dirty viewports or other external windows. Attenuation alarm
settings are configurable from 5 to 95 percent, from either the back panel of the sensing head or from
the Ircon ModView program. When an alarm condition is detected, relay outputs provide notification
to external process control instrumentation.
When the attenuation adjustment alarming feature is enabled, the user can monitor attenuation levels
in a graphical format in the ModView program providing a historical view of the levels. In addition,
attenuation levels are available through the Modline 5 RS-485 output fed into an external device.
5.7
AOUT – Setup of Analog Signal Output Current Range and
Temperature Scaling
Modline 5 Sensors provide selection of the analog output current range and scaling of the selected range
to temperature. Scaling establishes a temperature span to correspond to the analog output current
