Fisher 244EH User Manual

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With version 2.0 and later of the Model 244EC Configuration Interface, 
users can view the measured temperature (PV) by selecting 

 

from the menu bar of the main configuration window (see Figure 3-2). 
In order to view a valid PV, a temperature sensor must be connected to 
the Model 244E transmitter, and the transmitter must be configured 
properly for that sensor type. The PV will be automatically updated on 
the Model 244EC screen approximately two times per second.

Figure 3-2. Viewing the Process
Variable with the 244EC

The electronics of the Model 244E transmitter contains an intermittent 
sensor algorithm that monitors the input signal during operation. The 
signal diagnostics routine, which occurs at each temperature update 
(every 500 milliseconds), eliminates output pulsing in an intermittent 
open sensor condition. Further, it validates the input signal before the 
digital-to-analog (D/A) conversion takes place.

If the process temperature changes, the intermittent sensor algorithm 
causes the transmitter to respond according to one of the three cases 
described below. Threshold value is the maximum change in reading (as 
a percentage of output range) within one update cycle (500 ms). The 
threshold value of the Model 244E is 2% of output range. 

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