Weather Radio User Manual

3-9

Transmitter Behavior with Intermittent Sensor Detect ON

When the Intermittent Sensor Detect feature is switched ON, the

transmitter can eliminate the output pulse caused by intermittent open

sensor conditions. Process temperature changes (∆T) within 2% of the

output range will be tracked normally by the transmitter’s output. A ∆T

greater than 2% of the output range will activate the intermittent

sensor algorithm. True open sensor conditions will cause the

transmitter to go into alarm.

Transmitter Behavior with Intermittent Sensor Detect OFF

When the Intermittent Sensor Detect feature is switched OFF, the

transmitter tracks all process temperature changes, even if they are the

consequence of an intermittent sensor. The output delay due to the

intermittent sensor algorithm will be eliminated.

Implementation The Intermittent Sensor Detect feature can be turned ON or OFF using

a Model 244E transmitter with software version 5.4.1 or earlier with

the Model 244EC software configuration tool when the transmitter is

connected to the Model 244EC Configurator.

Turning the Intermittent Sensor Detect feature OFF does not affect the

time needed for the transmitter to output the correct alarm signal after

detecting a true open sensor condition. However, the transmitter may

briefly output a false temperature reading for less than 0.5 seconds in

either direction (see Figure 3-4) up to100% of output range.

Figure 3-4. Open Sensor Response

(Three Cases)

Unless rapid response rate is necessary, the suggested setting of the

Intermittent Sensor Detect mechanism is ON.

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6

Transmitter Output (mA)

Time (seconds)

A false temperature output in

either direction up to the

threshold value (100 % of output

range if Intermittent Sensor Detect

is OFF) is possible when an open

sensor condition is detected.

Normal open sensor responses

High Alarm

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