Impulse MAQ20-940 Configuration - Manual (Page 14)

MAQ
®
20 Configuration Software Tool User Manual
8
5.0 Configuring the MAQ
®
20 Thermocouple Input Module
Figure 7: MAQ20-JTC Thermocouple Input Module Configuration Panel
To configure the module click on any cell in a row of the Main Registration Panel and then click the
Configure Module button this will open the MAQ20 Thermocouple Input Module. Four modules are
offered to interface to five different thermocouple types; one for Type J, one for Type K, one for Type T
and one for Types R and S.
5.1 TC Channel Configuration:
Input Range settings can be set on a channel-by-channel basis along with the Avg Weight used for the
average value calculation. The average calculation uses 2^(Avg Weight) samples, i.e. the average
calculation for the configuration shown above uses the most recent 2^(3) = 8 samples. If changes are
made to the Range or the Avg Weight, the appropriate Set button must be pressed to write the settings to
the module nonvolatile memory. A Scan List is provided to give the ability to scan between 1 and n
sequential channels, where n = 8 for 8-channel modules and n = 16 for 16-channel modules. A Scan List
value of n specifies that channels 0 through n-1 will be sampled. The default scan list setting is 8.
Pressing the Set button sends the data to the input module and the scan list will remain active until the
next power cycle. Press the Save button to store the settings to the module nonvolatile memory.
5.2 TC Input Readings:
Data read from each of the active channels is displayed in this section. Data can be displayed in Counts
or Engineering Units (deg C). If the Loop Read check box is selected data will update every 0.5 second
and if it is unselected, data is manually updated by pressing the Read button. The Read Type drop down
box gives the user the ability to select what type of readings will be displayed (Current, Average,
Maximum or Minimum). The Alarm Status colors are used when channels are configured with alarm
limits. When an alarm limit for a given channel is exceeded, the background color of the cell displaying
data for that channel will change indicate which limit has been exceeded. The Conv Tool button opens a
utility that converts temperature to Millivolts or Millivolts to temperature.